7SR2423-2.A22-0AA0 - Siemens - Datasheet.Directory

Answers for energy.

7SR242 Duobias

Transformer Protection Relay

Reyrolle

Protection

Devices

2

3

Contents

Technical Manual Chapters

1. Description of Operation

2. Settings, Configuration & Instruments

3. Performance Specification

4. Data Communications

5. Installation

6. Commissioning and Maintenance

7. Applications Guide

4

5

Software Revision History

2017/08

2662H85001 R8c-7d

Phase currents added to 61850. 5A instruments corrected.

2015/11 2662H85001 R8b-7c EN100+ compatibility.

Additional ‘46IT’ and ‘51’ element time multiplier

steps incorporated.

2013/01

2662H85001 R7c-7b

Revised file handling during shutdown

2012/08 2662H85001 R7b-7a

(Requires hardware

CC)

Addition of optional IEC 61850 communication protocol and Ethernet.

Compatible with H/W CC

2010/02 2662H80001 R4c-3 Revisions to: VT ratio settings, 87BD 1st bias slope limit setting incre-

ments, CB fail function, LED CONFIG menu, DATA STORAGE menu.

Added: Open circuit detection (46BC), CONTROL MODE menu, Close

circuit supervision (74CCS), Measured earth fault undercurrent (37G),

Pulsed output co ntac ts.

2008/07

2662H80001R3d-2c.

Demand metering. Optional DNP3.0 data comms.

2008/05

2662H80001R3-2b

First Release.

Hardware Revision History

2015/11

DD

EN100+ Ethernet comms card replaces EN100.

2012/08

CC

Hardware revisions to allow integration of IEC 61850 functionality.

2008/05

BB

First Release

6

www. siemens.com/energy

7SR242 Duobias Contents

Contents

Technical Manual Chapters

1. Description of Operation

2. Settings, Configuration & Instruments

3. Performance Specification

4. Data Communications

5. Installation

6. Commissioning and Maintenance

7. Applications Guide

7SR242 Duobias Contents

Software Revision History

2017/08

2662H85001 R8C-7d

Phase currents added to 61850. 5A instruments corrected.

2015/11

2662H85001 R8b-7c

Additiona l ‘46IT ’ and ‘51’ elem ent time mul tip lier ste ps incor p orated.

2013/01

2662H85001 R7c-7b

Revised file handling during shutdown

2012/08 2662H85001 R7b-7a

(Requires hardware

CC)

Addition of optional IEC 61850 communication protocol and Ethernet.

Compatible with H/W CC

2010/02 2662H80001 R4c-3 Revisions to: VT ratio settings,

87BD 1st bias slope limit setting

increments, CB fail function, LED CONFIG menu, DATA STORAGE

menu.

Added: Open circuit detection (46BC), CONTROL MODE menu, Close

circuit supervision (74CCS), Measured earth fault undercurrent (37G),

Pulsed output co ntac ts.

2008/07

2662H80001R3d-2c.

Demand metering. Optional DNP3.0 data comms.

2008/05

2662H80001R3-2b

First Release.

Hardware Revision History

2015/11

DD

EN100+ Ethernet comms card replaces EN100.

2012/08

CC

Hardware revisions to allow integration of IEC 61850 functionality.

2008/05

BB

First Release

7SR242 Duobias Contents

Chapter 1) 7SR242 Duobias Description Of Operation

The copyright and other intellectual property rights in this document, and in any model or article produced from it

(and including any registered or unregistered design rights) are the property of Siemens Protection Devices

Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval

system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be

reproduced from this document unless Siemens Protection Devices Limited consent.

While the information and guidance given in this document is believed to be correct, no liability shall be accepted

for any loss or damage caused by any error or omission, whether such error or omission is the result of

negligence or any other cause. Any and all such liability is disclaimed.

7SR242 Duobias

Multi-Function 2-Winding Transformer Protection Relay

Description of Operation

Document Release History

This document is is sue 2017/08. The list of revisions up to and including this issue is:

2017/08 Software revision 2662H85001 R8c-7d

2015/11 7SR2424 added. RS485 comms terminal labelling revised

Figure 1-4). Text revisions to LED indications (2.5), inrush detector (5.3), waveform records (6.4.3)

and fault data records (6.4.4).

2014/04 Section 6.4.3 - Waveform Records revised.

2013/01 Software revision 2662H85001 R7c-7b

2012/08 Addition of optional IEC 61850 communication protocol.

2010/06 Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and typographical

revisions

2010/02 Document reformat due to rebrand

2010/02 Software revision 2662H80001 R4c-3

2008/07 Software revision 2662H80001R3d-2c.

2008/05 First issue

Chapter 1) 7SR242 Duobias Description Of Operation

Contents

Sectio n 1: Introduction .......................................................................................................................... 7

Current Transformer Circuits ............................................................................................................ 7

External Resistors ............................................................................................................................. 7

Fibre Optic Communication .............................................................................................................. 7

Front Cover ....................................................................................................................................... 7

Section 2: Hardware Descrip ti on ........................................................................................................ 15

2.1 General ................................................................................................................................... 15

2.2 Case ........................................................................................................................................ 15

2.3 Front Cover ............................................................................................................................. 16

2.4 Po wer Su p p l y Unit (P SU ) ........................................................................................................ 16

2.5 Operator Interface/ Fascia ...................................................................................................... 16

2.6 Current Inputs ......................................................................................................................... 19

2.7 Voltage Input ........................................................................................................................... 19

2.8 Binary inputs ........................................................................................................................... 19

2.9 Binary outputs (Output Relays) ............................................................................................... 20

2.10 Virtual Input/O ut puts ............................................................................................................... 21

2.11 Self Monitoring ........................................................................................................................ 22

2.11.1 Protect ion Hea lthy/Def ect ive ...................................................................................... 22

Sectio n 3: Protection Functions ......................................................................................................... 23

3.1 Current Protection: Differential Protection .............................................................................. 23

3.1.1 ICT .............................................................................................................................. 23

3.1.2 Overall Biased Differential (87BD) ............................................................................. 24

3.1.3 87HS .......................................................................................................................... 26

3.2 Curr ent Protec t ion: Phase Overcurrent (51, 50) ..................................................................... 28

3.2.1 Instantaneous Overcurrent Protection (50) ................................................................ 28

3.2.2 Time Delayed Overcurrent Protection (51) ................................................................ 29

3.3 Current Protection: Derived Earth Fault (50N, 51N) ............................................................... 30

3.3.1 Instantaneous Derived Earth Fault Protection (50N) ................................................. 30

3.3.2 Time Delayed Derived Earth Fault Protection (51N) ................................................. 31

3.4 Current Protection: Measured Earth Fault (50G, 51G) ........................................................... 32

3.4.1 Instantaneous Measured Earth Fault Protection (50G) ............................................. 32

3.4.2 Time Delayed Measured Earth Fault Protection (51G) .............................................. 33

3.5 Current Protection: High Impedance Restricted Earth Fault (64H) ........................................ 34

3.6 Open Circuit (46BC) ................................................................................................................ 35

3.7 Current Protection: Negative Phase Sequence Overcurrent (46NPS) ................................... 36

3.8 Current Protection: Under-Current (37, 37G) ......................................................................... 37

3.9 Current Protection: Thermal Overload (49) ............................................................................ 38

3.10 Voltage Protection: Over Fluxing (24) ..................................................................................... 40

3.11 Voltage Protection: Under/Over Voltage (27/59) .................................................................... 42

3.12 Voltage Protection: Neutral Overvoltage (59N) ...................................................................... 43

3.13 Voltage Protection: Under/Over Frequency (81) .................................................................... 45

Sectio n 4: Control & Logic Functions ................................................................................................ 46

4.1 Quick Logic ............................................................................................................................. 46

Sectio n 5: Supervision Functions ...................................................................................................... 48

5.1 Circuit Breaker Failure (50BF) ................................................................................................ 48

5.2 Trip/Close Circuit Supervision (74TCS/74CCS) ..................................................................... 50

5.3 Inrush Detector (81HBL2) ....................................................................................................... 51

Chapter 1) 7SR242 Duobias Description Of Operation

5.4 Over Fluxing Detector (81HBL5)............................................................................................. 52

Sectio n 6: Other Features .................................................................................................................... 54

6.1 Data Communications ............................................................................................................. 54

6.2 IEC 61850 Communications ................................................................................................... 54

6.3 Maintenance............................................................................................................................ 55

6.3.1 Output Matrix Test ...................................................................................................... 55

6.3.2 CB Counters ............................................................................................................... 55

6.3.3 I2t CB Wear ................................................................................................................ 55

6.4 Data Stora ge ........................................................................................................................... 56

6.4.1 General ....................................................................................................................... 56

6.4.2 Event Records ............................................................................................................ 56

6.4.3 Waveform Records. ................................................................................................... 56

6.4.4 Fault Data Records .................................................................................................... 57

6.4.5 Demand ...................................................................................................................... 57

6.4.6 Demand/Data Log ...................................................................................................... 57

6.5 Metering .................................................................................................................................. 58

6.6 Oper ati ng Mod e ...................................................................................................................... 58

6.7 Control Mode........................................................................................................................... 58

6.8 Real Time Clock ...................................................................................................................... 59

6.8.1 Time Synchronisation – Data Comms ....................................................................... 59

6.8.2 Time Synchronisation – Binary Input ......................................................................... 59

6.8.3 Time Synchronisation – IRIG-B (Optional) ................................................................. 59

6.9 Settings Groups ...................................................................................................................... 59

6.10 Password Feature ................................................................................................................... 60

Chapter 1) 7SR242 Duobias Description Of Operation

List of Figures

Figure 1-1 Function Diagram: 7SR242n-2aAnn-0AA0 Relay ............................................................. 10

Figure 1-2 Function Diagram: 7SR242n-2aAnn-0BA0 Relay ............................................................. 11

Figure 1-3 Function Diagram: 7SR242n-2aAnn-0C A0 Rela y ............................................................. 12

Figure 1-4 Connection Diagram: 7SR242 Relay ................................................................................. 13

Figure 2-1 7SR24 with 3 + 16 LEDs in E8 Case ................................................................................ 16

Figure 2-2 Binary Input Logic ............................................................................................................. 19

Figure 2-3 Binary Output Logic .......................................................................................................... 21

Figure 2.11-1 Start-up Counter Meter .................................................................................................... 22

Figure 3-1 Biased Differential Characteristic ....................................................................................... 24

Figure 3-2 Functional Diagram for Biased Current Differential Protection .......................................... 25

Figure 3-3 Differential Highset Characteristic ..................................................................................... 26

Figure 3-4 Logic Diagram: High Set Current Differential Protection ................................................... 27

Figure 3-5 Logic Diagram: Instantaneous Over-cur rent El ement ....................................................... 28

Figure 3-6 Logic Diagram: Time Delayed Overcurrent Element ......................................................... 29

Figure 3-7 Logic Diagram: Instantaneous Derived Earth Fault Element............................................. 30

Figure 3-8 Logic Diagram: Derived Time Delayed Earth Fault Protection .......................................... 31

Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element .......................................... 32

Figure 3-10 Logic Diagram: Time Delayed Measured Earth Fault Element (51G) ............................... 33

Figure 3-11 Logic Diagram: High Impedance REF (64H) ..................................................................... 34

Figure 3-12 Logic Diagram: Open Circuit Function (46BC) .................................................................. 35

Figure 3-13 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS) .................................... 36

Figure 3-14 Logic Diagram: Undercurrent Detector (37, 37G) .............................................................. 37

Figure 3-15 Logic Diagram: Thermal Overload Protection (49) ............................................................ 39

Figure 3-16 Inverse Over-fluxing Characteristic (24IT) ......................................................................... 40

Figure 3-17 Logic Diagram: Overfluxing Elements (24) ........................................................................ 41

Figure 3-18 Logic Diagram: Under/Over Voltage Elements (27/59) ..................................................... 42

Figure 3-19 Logic Diagram: Neutral Overvoltage Element ................................................................... 44

Figure 3-20 Logic Diagram: Under/Over Frequency Detector (81) ....................................................... 45

Figure 4-1 Sequence Diagram showing PU/DO Timers in Quick Logic (Counter Reset

Mode Off) ........................................................................................................................... 47

Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF) ...................................................... 49

Figure 5-2 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ................................................ 50

Figure 5-3 Logic Diagram: Close Circuit Supervision Feature (74CCS) ............................................. 50

Figure 5-4 Logic Diagram: Inrush Detector Feature (81HBL2) ........................................................... 51

Figure 5-5 Logic Diagram: Overfluxing Detector Feature (81HBL5) ................................................... 52

List of Tables

Table 1-1: 7SR242 Ordering Options ....................................................................................................... 8

Table 2-1 Summary of 7SR24 Relay Configurations ......................................................................... 15

Table 6-1 Operati ng Mod e ................................................................................................................. 58

Chapter 1) 7SR242 Duobias Description Of Operation

Symbols and Nomenclature

The following notational and formatting conventions are used within the remainder of this document:

• Setting Menu Location MAIN MENU>SUB-MENU

• Setting: Elem name -Setting

• Setting value: value

• Alternatives: [1st] [2nd] [3rd]

S

RQ

c

Pickup

Operate

Elem Starter

Elem Inhibit

Elem Reset Delay

c

Forward

Reverse

Elem Char Dir

Non-Dir

L1 Dir Blk

PhaseAFwd

Binary input signal

visible to user

Binary Output visible to user

Digital signal not visible to

user, to/from another element

List of settings associated with a specific

function

Appropriate list is TRUE when setting

selected.

Digital signal not visible to

user, internal to this element

IL1

Analogue signal with signal

description

Common setting for multiple functions

c

Pickup

Operate

Function.

Individual functions are enabled when

associated control input (c) is TRUE.

Common control input (c) for multiple

functions. All functions are enabled

when control input is TRUE.

&

And Gate

(2 inputs shown)

≥1

Or Gate

(3 inputs shown)INST.

EVENT

EVENT: IEC, Modbus, DNP etc.

Where applicable

Relay instrument

=1

Exclusive Or (XOR) Gate

(3 inputs shown)

Latch (Set/Reset)

Positive Edge Trigger

Chapter 1) 7SR242 Duobias Description Of Operation

Section 1: Introduction

This manual is applicable to the following relays:

• 7SR242 Multi-Function 2-Winding Transformer Protection Relay

The 7SR242 relay integrates the protection and control elements required to provide a complete transformer

protection.

The ‘Ordering Options’ Tables summarise the features availa ble in each mod el.

General Safety Precautions

Current Transformer Circuits

The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can result in

injury to personnel or damage to equipment.

External Resistors

Where external resistors are fitted to relays, these may present a danger of electric shock or burns, if touched.

Fibre O ptic C ommunication

Where fibre optic communication devices are fitted, these should not be viewed directly. Optical power meters

should be used to determine the operation or signal level of the device.

Front Cover

The front cover provides additional securing of the relay element within the case. The relay cover should be in

place during nor mal oper atin g cond itions.

!

Chapter 1) 7SR242 Duobias Description Of Operation

Table 1-1: 7SR242 Ordering Options

DUOBIAS-M

7

S

R

2

4

2

□

-

2

□

A

□

-

0

□

A

0

▲

Multi funct ional 2 winding

|

transformer differential

Protection Produc t

|

protection

Transformer

4

|

Relay Type

|

Diff erential (2 winding)

2

|

Case I/O and Fascia

|

E8 case, 6 CT, 2 EF/REF CT, 1 VT, 9 Binary Inputs / 6 Binary Outputs,

16 LEDs

2

|

E10 case, 6 CT, 2 EF/REF CT, 1 V T, 19 Bin ary Inputs / 14 Binary O utputs,

24 LEDs

3

|

E12 case, 6 CT, 2 EF/REF CT, 1 V T, 39 Bin ary Inputs / 14 Binary O utputs,

32 LEDs

4

|

Meas uring Input

|

1/5 A, 40 - 160V, 50/60Hz

2

|

Auxiliary voltage

|

30 to 220V DC, binar y input thresh old 19V DC

A

|

30 to 220V DC, binar y input thresh old 88V DC

B

|

Communication Interface

|

Standard ver sion – includ ed in all models , USB front port, RS48 5 rear port

1

1/2

|

Standard ver sion – plus addi tional rear F/O ST connector s (x2) and IRIG-B

2

1/2

|

Standard version – plus a dditional rear RS485 (x1) an d IRIG-B

3

1/2

|

Standard ver sion – plus addi tional rear R S232 (x1) and IRIG-B

4

1/2

|

Standard ver sion – plus addi tional rear Electrical Ethernet RJ45 (x2)

7

|

Standard version – plus a dditional rear Optic al Ethernet Dupl ex (x2)

8

7

|

Protocol

|

IEC 60870-5-103 and Modbus RTU (user selec table s etting)

1

|

IEC 60870-5-103, Modbus RTU and DNP 3.0 (user selectabl e)

2

|

IEC 60870-5-103, Modbus RTU and DNP 3.0 (user selectabl e) and IE C 61850

7

|

Protection Function Packages

|

Option A: Standard version – Included in al l model s

- 81HBL2 Inrush D etector

- 81HBL5 Overflux i ng det ec tor

- 87BD Biase d curre nt differ ential

- 87HS Current diff er ent ial hi ghes t

Programmable logic

For each win ding/c ircuit breaker

- 50BF Circuit breaker fail

- 64H High impedance REF

- 74TCS/CCS Tr ip/close circuit supervision

Option B: Standard v ersion – plus

- 37/37G Undercurrent

- 46BC Open ci rcuit

- 46NPS Negative phase sequence overcurrent

- 49 Thermal overload

- 50 Instantaneous phase fault overcurrent

- 50G/50N I nstanta neous ear th fault

- 51 Time delayed phase fault over current

- 51G/51N Ti me delayed earth fault

A

|

B

|

(continued on following page )

Chapter 1) 7SR242 Duobias Description Of Operation

DUOBIAS-M

7

S

R

2

4

2

□

-

2

□

A

□

-

0

□

A

0

▲

(continued from previous page)

Option C: Standard v ersion - plus

- 24 Overfluxing

- 27/59 Under/overvoltage

- 59N Neutr al vol t age di s plac e m ent

- 81 Under/overfrequency

- 37/37G Undercurrent

- 46BC Open c ircuit

- 46NPS Negative phase sequenc e overcur rent

- 49 Therm al overload

- 50 Instant aneous phase f ault overcurrent

- 50G/50N I nstanta neous ear th fault

- 51 Time delayed phase fault overcurrent

- 51G/51N Time delayed earth fault

C

|

Additional Functionality

|

No Ad ditional Functionality

A

Chapter 1) 7SR242 Duobias Description Of Operation

50

BF-1

50

BF-1

50

BF-1

Ig-1

50

BF-2

50

BF-2

50

BF-2

64H

W1-Ia

64H

81

HBL

5

81

HBL

5

81

HBL

5

74

TCS

(x6)

Ig-2

W1-Ib

W2-Ic

W2-Ib

W2-Ia

81

HBL

2

81

HBL

2

81

HBL

2

81

HBL

2

81

HBL

2

81

HBL

2

81

HBL

5

81

HBL

5

81

HBL

5

87HS 87BD

ICT

7SR242n-2aAn1-0AA0

50

BF-1

I4

50

BF-2

I4 74

CCS

(x6)

Figure 1-1 Function Diagram: 7SR242n-2aAnn-0AA0 Relay

Chapter 1) 7SR242 Duobias Description Of Operation

Ig-1

W1-Ia

Ig-2

W1-Ib

W1-Ic

W2-Ic

W2-Ib

W2-Ia

50G

(x2)

51G

(x4) 64H

81

HBL5

81

HBL5

81

HBL5

74

TCS

(x6)

7SR242n-2aAn1-0BA0

81

HBL2

81

HBL2

81

HBL2

87HS 87BD

ICT

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

50N

(x2)

51N

(x2)

46

BC

(x2)

37 49

50N

50

BF-2

50

BF-2

50

BF-2

46

NPS

51N

51

50

50G 51G 64H

81

HBL2

81

HBL

2

81

HBL

2

81

HBL5

81

HBL5

81

HBL5

Each function element

can be assigned to W1

or W2 CT inputs.

NOTE: The use of some

functions are mutually

exclusive

37G

(x2)

50

BF-1

I4

37G

50

BF-2

I4

74

CCS

(x6)

46

BC

46

NPS

(x4)

Figure 1-2 Function Diagram: 7SR242n-2aAnn-0BA0 Relay

Chapter 1) 7SR242 Duobias Description Of Operation

Ig-1

50G

(x2)

51G

(x4) 64H

W1-Ia 81

HBL5

81

HBL5

81

HBL5

V

74

TCS

(x6)

59N

(x2)

27

59

(x4)

81

(x6)

Ig-2

W1-Ib

W1-Ic

W2-Ic

W2-Ib

W2-Ia

7SR242n-2aAn1-0CA0

81

HBL2

81

HBL2

81

HBL2

87HS 87BD

ICT

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

37

(x2) 49

50

(x2)

51

(x2)

50

BF-1

50N

(x2)

51N

(x2)

46

BC

(x2)

37 49

50N

50

BF-2

50

BF-2

50

BF-2

46

NPS

51N

51

50

50G 51G 64H

81

HBL2

81

HBL

2

81

HBL

2

81

HBL5

81

HBL5

81

HBL5

Each function element

can be assigned to W1

or W2 CT inputs.

NOTE: The use of some

functions are mutually

exclusive

24

(x3)

37G

(x2)

50

BF-1

I4

37G

50

BF-2

I4

74

CCS

(x6)

46

BC

46

NPS

(x4)

Figure 1-3 Function Diagram: 7SR242n-2aAnn-0CA0 Relay

Chapter 1) 7SR242 Duobias Description Of Operation

Rear View: Arrangement of terminals and modules

Shows contacts internal

to relay case assembly.

Contacts close when the

relay chassis is

withdrawn from case

NOTES

BI = Binary Input

BO = Binary Output

BI 10

+ve

-ve

2

4

BI 11

+ve

-ve

6

8

BI 12

+ve

10

BO 7

BO 8

BO 9

BI 13

+ve

12

BI 14

+ve

14

BI 15

+ve

-ve

16

18

BI 16

20

BI 17

+ve

22

BI 18

+ve

24

BI 19

+ve

-ve

26

28

+ve

BO 10

BO 11

BO 12

BO 13

BO 14

D

21

19

17

23

25

27

3

1

7

5

11

9

15

13

BO 1

GND.

BI 1

+ve

-ve

+ve

-ve

22

24

28

2

4

BI 2

+ve

-ve

6

8

BI 3

+ve

-ve

10

12

BO 2

BO 3

BO 4

BO 5

7SR242

C

A

RS485

Screen

B

Term.

14

16

18

20

13

14

15

16

1A

5A

1

2

3

4

1A

5A

5

6

7

8

1A

5A

9

10

11

12

1A

5A

A

Ig-1

V

27

28

17

18

19

20

5A

BI 4

+ve

18

BI 5

+ve

22

BI 6

+ve

-ve

26

28

1A

5A

1

2

3

4

1A

5A

5

6

7

8

1A

5A

9

10

11

12

B

-ve

20

-ve

24

BI 7

+ve

17

BI 8

+ve

21

BI 9

+ve

-ve

25

27

-ve

19

-ve

23

W1-Ia

W1-Ib

W1-Ic

W2-Ic

W2-Ib

W2-Ia

Ig-2

BO 6

9

5

7

27

3

1

15

11

13

19

17

23

21

25

26

BI 20

+ve

-ve

2

4

BI 21

+ve

-ve

6

8

BI 22

+ve

10

BI 23

+ve

12

BI 24

+ve

14

BI 25

+ve

-ve

16

18

BI 26

20

BI 27

+ve

22

BI 28

+ve

24

BI 29

+ve

-ve

26

28

+ve

E

BI 30

+ve

-ve

1

3

BI 31

+ve

-ve

5

7

BI 32

+ve 9

BI 33

+ve 11

BI 34

+ve 13

BI 35

+ve

-ve

15

17

BI 36

19

BI 37

+ve 21

BI 38

+ve 23

BI 39

+ve

-ve

25

27

+ve

A

CT/VT

B

CT

D

Optional

I/O

1 2

27 28

1 21 2

27 2827 28

Data

Comms

(Optional)

C

PSU

1 2

27 28

E

Optional

I/O

1 2

27 28

Figure 1-4 Connection Diagram: 7SR242 Relay

Chapter 1) 7SR242 Duobias Description Of Operation

Section 2: Hardware Description

2.1 General

The structure of the relay is based upon the Multi-function hardware platform. The relays are supplied in either

size E8, E10 or E12 cases (where 1 x E = width of approx. 26mm). The hardware design provides commonality

between products and components across the 7SR2 rang e of relay s.

Table 2-1 Summary of 7SR24 Relay Configurations

Relay Current

Inputs Voltage

Inputs Binary

Inputs Output

Relays LEDs Case

7SR2422 8 1 9 6 16 E8

7SR2423 8 1 19 14 24 E10

7SR2424 8 1 39 14 32 E12

Relays are assembled from the following modules:

1) Front Fascia with three fixed function LEDs and ordering options of configurable LEDs.

2) Processor module

3) Analogue Input module ‘A’: 3 x Current + 6 x Binary Inputs

4) Analogue Input module ‘B’: 5 x Current + 1 x Voltage.

5) Power Supply and basic Binary Input (BI) and Binary Output (BO).

6) Optional Binary Input/Output Module

7) Optional Binary Input Module

8) Optional data comms module

2.2 Case

The relays are housed in cases designed to fit directly into standard panel racks.

The complete relay assembly is withdrawable from the front of the case. Contacts in the case ensure that the CT

circuits remain short-circuited when the relay is removed. Note that when the optional Ethernet comms module is

fitted to the relay the comms cables and the EN100 module rear securing screw must be removed before the

relay assembly is withdrawn.

The rear terminal blocks comprise M4 screw terminals for wire connections. Each terminal can accept two 90

degree ring tongue crimps.

Located at the top rear of the case is a screw clamp earthing point, this must be connected to the main panel

earth.

See Chapter 5 (Installation Guide) for full details of panel cut-out and internal clearance requirements.

Chapter 1) 7SR242 Duobias Description Of Operation

2.3 Front Co ver

With the transparent front cover in place the user only has access to the ▼ and TEST/RESET► buttons,

allowing all areas of the menu system to be viewed, but preventing setting changes and control actions. The only

‘action’ that is permitted is to reset the Fault Data display, latched binary outputs and LEDs by using the

TEST/RESET  button.

The front cover is used to secure the relay assembly in the case.

2.4 Power Supply Unit (PSU)

The relay PSU can be directly connected to any substation dc system rated from 30V dc to 220V dc.

In the event of the station battery voltage level falling below the relay minimum operate level the PSU will

automatically switch itself off and latch out – this prevents any PSU overload conditions occurring. The PSU is

reset by switching the auxiliary supply off then on.

Typically the PSU is connected to the auxiliary supply via an external HRC fuse rated at 6A (BS88/IEC60259).

Isolation links may also be installed in accordance with user requirements.

2.5 Operato r In ter fa ce/ Fascia

The operator interface is designed to provide a user-friendly method of controlling, entering settings and retrieving

data from the relay.

Figure 2-1 7SR24 with 3 + 16 LEDs in E8 Case

NOTE: Pushbuttons on cover not shown

The fascia is an integral part of the relay. Handles are located at each side of the element to allow it to be

withdrawn from the relay case.

Chapter 1) 7SR242 Duobias Description Of Operation

Relay Information

Above the LCD three labels are provided, these provide the following information:

1) Product name and order code.

2) Nominal current rating, rated frequency, voltage rating, auxiliary dc supply rating, binary input supply

rating, configuration and serial number.

3) Blank label for user defined information.

A ‘template’ is available within the ‘Reydisp’ program to allow users to create and print customised LED label

inserts.

The warning and information labels on the relay fascia provide the following information:

Dielectric Test Voltage 2kV

Impulse Test Above 5kV

Caution: Risk of Electric Shock

Caution: Refer to Equipment Documentation

Liquid Crystal Display (LCD)

A 4 line by 20-character liquid crystal display indicates settings, instrumentation, fault data and control

commands.

To conserve power the display backlighting is extinguished when no buttons are pressed for a user defined

period. A setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1 to 60 minutes and

“Off” (backlight permanently on). After an hour the display is completely de-activated. Pressing any key will re-

activate the display.

The LCD contrast can be adjusted using a flat blade screwdriver to turn the screw located below the contrast

symbol . Turning the screw clockwise increases the contrast, anti-clockwise reduces the contrast.

‘PROTECTION HE ALTHY’ LED

This green LED is steadily illuminated to indicate that DC voltage has been applied to the relay power supply and

that the relay is operating correctly. If the internal relay watchdog detects an internal fault then this LED will

continuously flash.

‘PICKUP’ LED

This yellow LED is illuminated to indicate that a user selectable function(s) has picked up. The LED will self reset

after the initiating condition has been removed.

Functions are assigned to the PICKUP LED in the OUTPUT CONFIG>PICKUP CONFIG menu.

Chapter 1) 7SR242 Duobias Description Of Operation

‘TRIP’ LED

This red LED is steadily illuminated to indicate that a user selectable function has operated to trip the circuit

breaker. Functions are assigned to the ‘Trip’ LED using the OUTPUT CONFIG>Trip Contacts setting.

Operation of the LED is latched and can be reset by either pressing the TEST/RESET► button, energising a

suitably programmed binary input, or, by sending an appropriate command over the data communications

channel(s).

Indication LEDs

Relays have either 16, 24 or 32 user programmable LED indicators. Each LED can be programmed to be

illuminated as either green, yellow or red. Where an LED is programmed to be lit both red and green it will

illuminate yellow. . Each LED can be assigned two different colours dependent upon whether a Start/Pickup or

Operate condition initiates operation. The LED illumination colour is assigned in the OUTPUT CONFIG>LED

CONFIG menu for both Pickup and Operate initiation.

Functions are assigned to the LEDs in the OUTPUT CONFIG>OUTPUT MATRIX menu.

Each LED can be labelled by withdrawing the relay and inserting a label strip into the pocket behind the front

fascia. A ‘template’ is available to allow users to create and print customised legends.

Each LED can be user programmed as hand or self–resetting. Hand reset LEDs can be reset by either pressing

the TEST/RESET► button, energising a suitably programmed binary input, or, by sending an appropriate

command over the data communications channel(s).

The status of hand reset LEDs is maintained by a back up storage capacitor in the event of an interruption to the

d.c. supply voltage. The length of time for which the LED status will be maintained will depend on such things as

temperature, length of time in service, etc. However the status will be maintained for a minimum of 1.8 days.

LED status stored in fault data records are backed up in non-volatile memory and are permanently stored even in

the event of loss of auxiliary d.c. supply voltage, s ee section 6.4.4

Standard Keys

The relay is supplied as standard with five pushbuttons. The buttons are used to navigate the menu structure and

control relay functions. They are labelled:

▲ Increases a setting or moves u p menu.

▼ Decreases a setting or mov es dow n menu.

TEST/RESET► Moves right, can be used to reset selected functionality and for LED test (at

relay identif ier scr een).

ENTER Used to initiate and a ccept set ting s chang es.

CANCEL. Used to cancel settings changes and/or move up the menu structure by one

level per press.

NOTE: All settings and configuration of LEDs, BI, BO and function keys can be accessed and set by the user

using these keys. Alternatively configuration/settings files can be loaded into the relay using ‘ReyDisp’.

Chapter 1) 7SR242 Duobias Description Of Operation

2.6 Current Inputs

In total eight current inputs are provided on the Analogue Input modules. Terminals are available for both 1A and

5A inputs. CT ratios are input by the user in the CT/VT CONFIG menu.

Current is sample d at 1600Hz for 50Hz systems and 1920Hz for 60Hz systems (32 samples per cycle).

The waveform recorder samples and displays current input waveforms at 32 samples per cycle.

2.7 Voltage Input

An optional voltage input is provided on the Analogue Input module ‘A’.

VT ratios are input by the user in the CT/VT CONFIG menu.

Voltage is sampled at 1600Hz for 50Hz systems and 1920Hz for 60Hz systems (32 samples per cycle).

The waveform recorder displays the voltage input waveform at 32 samples per cycle.

2.8 Binary inputs

The binary inputs are opto-couplers operated from a suitably rated dc supp ly .

Relays are fitted with 9 or 19 binary inputs (BI). The user can assign any binary input to any of the available

functio ns ( INPUT CONFIG > INPUT MATRIX).

The Power Supply module includes the relay basic I/O. The module includes 3 x BI.

Pick-up (PU) and drop-off (DO) time delays are associated with each binary input. Where no pick-up time delay

has been applied the input may pick up due to induced ac voltage on the wiring connections (e.g. cross site

wiring). The default pick-up time of 20ms provides ac immunity. Each input can be programmed independently.

Each input may be logically inverted to facilitate integration of the relay within the user scheme. When inverted the

relay indicates that the BI is energised when no d.c. is applied. Inversion occurs before the PU & DO time delay,

see fig. 2.8-1.

Each input may be mapped to any front Fascia indication LED and/or to any Binary output contact and can also

be used with the internal user programmable logic. This allows the relay to provide panel indications and alarms.

Event

BI 1

Binary Input 1

=1

Inverted Inputs

BI 1 inverted BI 1 P/U Delay

Event

BI n

Binary Input n

=1

BI n inverted BI n P/U Delay

INPUT CONFIG>

INPUT MATRIX

(Or gates)

Logic signals,

e.g. '51-1 Inhibit'

BI 1 D/O Delay

BI n D/O Delay

INPUT

CONFIG>

BINARY

INPUT

CONFIG

Figure 2-2 Binary Input Logic

Chapter 1) 7SR242 Duobias Description Of Operation

2.9 Binary outputs (Output Re lays)

Relays are fitted with 6 or 14 binary outputs. All outputs are fully user configurable and can be programmed to

operate from any or all of the available functions.

The Power Supply module includes the relay basic I/O. The module includes six binary outputs each fitted with 1

contact – providing in total 1 x normally closed (NC), 2 x change-over (CO) and 3 x normally open (NO) contacts.

In the default mode of operation binary outputs are self reset and remain energised for a user configurable

minimum time of up to 60 seconds. If required, outputs can be programmed to operate as ‘hand reset’ or ‘pulsed’.

Where an output is programmed to be ‘hand reset’ and ‘pulsed’ then the output will be ‘hand reset’ only.

The binary outputs can be used to operate the trip coils of the circuit breaker directly where the trip coil current

does not exceed the 'make and carry' contact rating. The circuit breaker auxiliary contacts or other in-series

auxiliary device must be used to break the trip coil current.

CB1 and CB2 ‘Trip Contacts’ are assigned in the OUTPUT CONFIG>BINARY OUTPUT CONFIG menu.

Operation of a ‘Trip Contact’ will actuate the ‘Trip Alert’ screen where enabled and will initiate both fault record

storage and CB Fail protection where enabled.

When the relay is withdrawn from the case all normally closed contacts will be open circuited. This should be

considered in the design of the control and protection circuitry.

Notes on Self Reset Outputs

Outputs reset after the initiate condition is removed, they are subject to the user definable ‘Minimum Operate

Time’ setting.

With a failed breaker condition the relay may remain operated until current flow in the primary system is

interrupted by an upstream device. The relay will then reset and attempt to interrupt trip coil current flowing

through an output contact. W here this level is above the break rating of the output contact an auxiliary relay with

heavy-duty contact s shou ld be utilise d.

Notes on Pulsed Outputs

When operated, the output will reset after the user definable ‘Minimum Operate Time’ setting regardless of the

initiating condition.

Notes on Hand Reset Outputs

Hand reset outputs can be reset by either pressing the TEST/RESET► button, by energising a suitably

programmed binary input, or, by sending an appropriate command over the data communications channel(s).

On loss of the auxiliary supply hand-reset outputs will reset. When the auxiliary supply is re-established the binary

output will remain in the reset state unless the initiating condition is still present.

Binary Output Test

The MAINTENANCE>OUTPUT MATRIX TEST menu includes a facility to test output relays from the relay fascia

without the need for a secondary injection test set.

Binary outputs can also be energised from the Reydisp Evolution software package where PC facilities are

available.

For both methods the output contact is energised for the duration of the ‘OUTPUT CONFIG > BINARY OUTPUT

CONFIG > Min Operate Time’ setting.

Chapter 1) 7SR242 Duobias Description Of Operation

Event

Output 1

Min Operate Time

Hand Reset

BO 1 hand reset

S

RQ

OUTPUT CONFIG>

OUTPUT MATRIX

(Or gates)

Logic signals,

e.g. '51-1'

Reset LEDs & Outputs (TEST/RESET key, Binary Input, Data Comms)

&&

&

≥1

Event

Output n

BO n hand reset

S

RQ

&&

&

≥1

BO 1

BO n

OUTPUT

CONFIG>

BINARY

OUTPUT

CONFIG

OUTPUT

CONFIG>

BINARY

OUTPUT

CONFIG

Figure 2-3 Binary Output Logic

2.10 Virtual Input/Outputs

The relays have 16 virtual input/outputs, these are internal logic states. Virtual I/O is assigned in the same way as

physical Binary Inputs and Binary Outputs. Virtual I/O is mapped from within the INPUT CONFIG > INPUT

MATRIX and OUTPUT CO NFIG > OUTPUT MATRIX menus.

The status of virtual I/O is not stored during power loss.

Chapter 1) 7SR242 Duobias Description Of Operation

2.11 Self M onitoring

The relay incorporates a number of self-monitoring features. Each of these features can initiate a controlled reset

recovery sequence.

Supervision includes a power supply watchdog, code execution watchdog, memory checks by checksum and

processor/ADC health checks. When all checks indicate the relay is operating correctly the ‘Protection Healthy’

LED is illuminate d.

If an internal failure is detected, a message will be displayed. The relay will reset in an attempt to rectify the

failure. This will result in de-energisation of any binary output mapped to ‘protection healthy’ and flashing of the

protection healthy LED. If a successful reset is achieved by the relay the LED and output contact will revert back

to normal operational mode, and the relay will restart, therefore ensuring the circuit is protected for the maximum

time.

A Start-up Counter Meter is provided to display the number of start-ups the relay has performed. Once the

number of start-ups has exceeded a set number, an Alarm output can be given.

Figure 2.11-1 Start-up Counter Meter

Reset of the counter can be done from the meter or via a binary input or a command.

Various types of start-up are monitored by the relay:

1. power-on starts (auxiliary supply initiation)

2. expected starts (user initiated via comms, language changes, custom protection curve etc.)

3. unexpected st art s (caused by the relay watchdog)

Any combination of these can be selected for the start-up count. This is done in the MAINTENANCE

MENU>START COUNT menu using the Start Up Types setting. All the start-up types selected will be added to

the overall start-up count.

The number of restarts before the alarm output is raised is set in the MAINTENANCE MENU>START COUNT

menu using the Start Up Count Target setting.

When the number of relay start-ups reaches the target value an output is raised, OUTPUT MATRIX>Start Up

Count Alarm, which can be programmed to any combination of binary outputs, LED’s or virtual outputs.

2.11.1 Protection Healthy/Defective

A normally open contact can be used to signal protection healthy. When the relay has DC supply and it has

successfully passed its self-checking procedure then the Protection Healthy contacts are made.

A normally closed contact is used to signal protection defective. When the DC supply is not applied to the relay or

a problem is detected within the relay then this output is de-energised and the normally closed contacts make to

provide an external alarm.

An alarm can be provided if the relay is withdrawn from the case. A contact is provided in the case at positions

25-26 of the PSU module, this contact closes when the relay is withdrawn.

Chapter 1) 7SR242 Duobias Description Of Operation

Section 3: Prot ection Functions

3.1 Current Protection: Differential Protection

Comprises both biased differential and high-set differ ential elements.

The fundamental frequency current is measured with the line CT inputs. These line currents are both multiplied

and vector corrected before being applied to the current differential elements.

3.1.1 ICT

The Wn ICT Multiplier setting is applied to the line c urrents – the CT secondary currents. The multiplier is used

to correct any CT ratio mismatch so that ideally nominal current (ICTOUT = 1A) is applied to the biased differential

algorithm.

The Wn ICT Connection setting applies the correct vector compensation to the current applied to the differential

algorithm.

The nominal current ratio of the virtual interposing CT is 1:1. Note that where Yd settings are applied some

current distributions will result in a √3 multiplying factor being applied. See ‘Applications Guide’.

Chapter 1) 7SR242 Duobias Description Of Operation

3.1.2 Overall Biased Differential (87BD)

87BD Initial

Setting 1st Bias

Slope

Limit

Bias (Restraint) Current

2II W2W1

+

87BD 1

st

Bias Slope

Operate Current

2nd Bias Slope

2nd Bias

Slope Type

W2W1

II +

I

W1

I

W2

Figure 3-1 Biased Differential Characteristic

Figure 3.1-1 illustrates the biased differential characteristic. Within the relay the fundamental frequency RMS line

currents are modified by the ICT Multiplier and ICT Connection settings (see 3.1.1) before being applied to th e

biased differential elements. The biased differential elements calculate the operate current for each phase from

the vector sum of winding 1 and winding 2 currents i.e. IOPERATE = IW1 + IW2. The bias (or restraint) current is

calculated from the tota l current of winding 1 and winding 2 currents i.e.

2II

IW2W1

RESTRAIN

+

=

.

The 87BD Initial setting defines the minimum differential current required to operate the relay.

The 8 7BD 1st Bias Slope setting is used to ensure protection stability in the presence of steady state errors e.g.

the effects of an on-load t ap c hanger .

The 87BD 1st Bias Slope Limit setting defines the border between the 1st and 2 nd bias slopes.

87BD 2nd Bias Slope Type setting allows the user to select the preferred characteristic shape i.e. Line or Curve.

The 87BD 2nd Bias Slope setting is applied when 87BD 2nd Bias Slope Type = Line. This setting is used to

modify the sensitivity of the differential algorithm at higher current levels.

The output of 87BD Delay can be mapped to relay outputs.

Operation of the bia sed diff erential elements can be inhibit ed from:

Inhibit 87BD A binary or virtual input.

87BD Inrush Action: Inhibit Operation of the inrush current detector

87BD Overfluxing Action: Inhibit Operation of the ov erfluxing detector

User Inhibit Reylogic (grap hi cal log ic).

Chapter 1) 7SR242 Duobias Description Of Operation

c

Pickup

Operate

≥

1

≥

1General Pickup

87BD

87BD 1

st Bias Slope Limit

Enable

87BD 1st Bias Slope

87BD Initial

W1-IL1

W1-IL2

W1-IL3

&

Inhibit 87BD

87BD Element

Enabled

Disabled

c

Pickup

Operate

c

Pickup

Operate

ICT

W1 ICT Multiplier

W1 ICT Connection

W2-IL1

W2-IL2

W2-IL3

ICT

W2 ICT Multiplier

W2 ICT Connection

87BD Delay

87BD 2nd Bias Slope

87BD 2nd Bias Slope Type

81HBL2 Element

Enabled

Disabled

Wn-IL1

Wn-IL2

Wn-IL3

81HBL2 Bias

L2 81HBL2

81HBL2 Setting

Enable

>

L1 81HBL2

L3 81HBL2

81HBL5 Element

Enabled

Disabled

Wn-IL1

Wn-IL2

Wn-IL3

81HBL5 Bias

81HBL5 Setting

Enable

>

87BD Inrush Action

Off

Inhibit

&

A

B

C

87BD ‘A’ Inhibit

87BD ‘B’ Inhibit

87BD ‘C’ Inhibit

87BD ‘A’

Inhibit

87BD ‘B’

Inhibit

87BD ‘C’

Inhibit

L2 81HBL5

L1 81HBL5

L3 81HBL5

87BD Overfluxing Action

Off

Inhibit

&

87BD ‘A’ Inhibit

87BD ‘B’ Inhibit

87BD ‘C’ Inhibit

User Inhibit 87BD

Figure 3-2 Functional Diagram for Biased Current Diffe rential Protection

Chapter 1) 7SR242 Duobias Description Of Operation

3.1.3 87HS

87HS Setting

Bias (Restraint) Current

Operate Current

W2

W1

II +

2II W2W1 +

Figure 3-3 Differential Highset Characteristic

Figure 3.1-3 illustrates the differential highset characteristic. W ithin the relay the fundamental frequency RMS line

currents are modified by the ICT Multiplier and ICT Connection settings (see 3.1.1) before being applied to the

differential highset elements. The differential highset elements calculate the operate current for each phase from

the vector sum of winding 1 and winding 2 currents i.e. IOPERATE = IW1 + IW2.

87HS Setting defines the differential current required to operate the element. The output of 87HS Delay can be

mapped to relay outputs.

Operation of the highset differential elements can be inhibited from:

Inhibit 87HS A binary or virtual input.

87HS Inrush Action: Inhibit Operation of the inrush current detector

87HS Overfluxing Action: Inhibit Operatio n of the ov erfluxing detector

User Inhibit Reylogic (grap hi cal log ic).

Chapter 1) 7SR242 Duobias Description Of Operation

c

Pickup

Operate

87HS Setting

Enable

c

Pickup

Operate

c

Pickup

Operate

87HS ‘A’

Inhibit

87HS ‘B’

Inhibit

87HS ‘C’

Inhibit

General Pickup

87HS

W1-IL1

W1-IL2

W1-IL3

ICT

W1 ICT Multiplier

W1 ICT Connection

W2-IL1

W2-IL2

W2-IL3

ICT

W2 ICT Multiplier

W2 ICT Connection

87HS Delay

81HBL2 Element

Enabled

Disabled

Wn-IL1

Wn-IL2

Wn-IL3

81HBL2 Bias

L2 81HBL2

81HBL2 Setting

Enable

>

L1 81HBL2

L3 81HBL2

81HBL5 Element

Enabled

Disabled

Wn-IL1

Wn-IL2

Wn-IL3

81HBL5 Bias

81HBL5 Setting

Enable

>

87HS Inrush Action

Off

Inhibit

&

87HS ‘A’ Inhibit

87HS ‘B’ Inhibit

87HS ‘C’ Inhibit

L2 81HBL5

L1 81HBL5

L3 81HBL5

87HS Overfluxing Action

Off

Inhibit

&

87HS ‘A’ Inhibit

87HS ‘B’ Inhibit

87HS ‘C’ Inhibit

&

Inhibit 87HS

87HS Element

Enabled

Disabled

User Inhibit 87HS

Figure 3-4 Logic Diagram: High Set Current Differential Protection

Chapter 1) 7SR242 Duobias Description Of Operation

3.2 Current Prot ection: Phase Overcurrent (51, 50)

The optional phase overcurrent elements have a common setting to measure either fundamental frequency RMS

or True RMS current:

True RMS current: 51/50 Measurement = RMS

Fundamental Frequency RMS current: 51/50 Measurement = Fundamental

3.2.1 Instantaneous Overcurrent Protection (50)

Optionally two instantaneous overcurrent elements are provided, each can be selected to either winding 1 or

winding 2.

Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and 50-n Delay

follower time delay. The instantaneous elements have transient free operation.

Operation of the instantaneous overcurrent elements can be inhibited from:

Inhibit 50-n A binary or virtual input.

50-n Inrush Action: Inhibit Operation of the inru sh detector function.

User Inhibit Reylogic (graphical logic).

50-n

50-n Setting

Enable

>

c

50-n Delay

>

c

>

c

Wn-IL1

Wn-IL2

Wn-IL3

50/51

Measurement

L1 81HBL2

50-n Inrush

Action

Off

Inhibit

&

L2 81HBL2

L3 81HBL2

&

≥

1

General Pickup

≥

1

&

Inhibit 50-n

50-n Element

Enabled

Disabled

User Inhibit 50-n

Figure 3-5 Logic Diagram: Instantaneous Over-current Element

Chapter 1) 7SR242 Duobias Description Of Operation

3.2.2 Time Delayed Overcurrent Protection (51)

Optionally two time delayed overcurrent elements are provided, each can be selected to either winding 1 or

winding 2.

51-n Setting sets the pick-up current level.

A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is

se lected from IEC, ANSI or user defined curv es usi ng 51-n Char. A time multiplier is applied to the characteristic

curves using the 51-n Time Mult setting. Alternatively, a definite time lag delay (DTL) can be chosen using 51-n

Char. When Delay (DTL) is selected the time multiplier is not applied and the 51-n Delay (DTL) setting is used

instead. The full list of operating curves is given in Chapter 2 – ‘Settings, Configuration and Instruments Guide’.

Operating curve characteristics are illustrated in Chapter 3 – ‘Performance Specification’.

The 51-n Reset setting can apply a definite time delayed reset, or when configured as an ANSI characteristic an

ANSI (DECAYING) reset. If ANSI (DECAYING) reset is selected for an IEC characteristic, the reset will be

instantaneous. The reset mode is significant where the characteristic has reset before issuing a trip output – see

‘Applications Guide’.

A minimum operate time for the characteristic can be set using 51-n Min. Operate Time setting.

A fixed additional operate time can be added to the characteristic using 51-n Follower DTL setting.

Operation of the time delayed overcurrent elements can be inhibited from:

Inhibit 51-n A binary or virtual input.

51-n Inrush Action: Inhibit Operation of the inrush dete ctor function.

User Inhibit Reylogic (graphical logic).

≥

1General Pickup

51-n

51-n Setting

51-n Char

51-n Time Mult

51-n Delay (DTL)

51-n Reset

Enable

51-n Follower DTL

51-n Min. Operate Time

Wn-IL1

Wn-IL2

Wn-IL3

50/51

Measurement

L1 81HBL2

51-n Inrush

Action

Off

Inhibit

&

L2 81HBL2

L3 81HBL2

&

c

Pickup

Operate

c

Pickup

Operate

c

Pickup

Operate

≥

1

&

Inhibit 51-n

51-n Element

Enabled

Disabled

User Inhibit 51-n

Figure 3-6 Logic Diagram: Time Delayed Overcurrent Element

Chapter 1) 7SR242 Duobias Description Of Operation

3.3 Current Prot ection: Derived Earth Fault (50N, 51N)

The earth current is derived by calculating the sum of the measured line currents. These optional elements utilise

RMS current values of the fundamental frequency (50 or 60Hz).

3.3.1 Instantaneous Derived Earth Fault Protection (50N)

Optionally two instantaneous derived earth fault elements are provided, each can be selected to either winding 1

or winding 2.

Each instantaneous element has independent settings for pick-up current 50N-n Setting and a follower time

delay 50N-n Delay. The instantaneous elements have transient free operation.

Operation of the ins tant aneo us earth fault elements can be inhib ited fr om :

Inhibit 50N-nt A binary or virtual input.

50N-n Inrush Action: Inhibit Operation of the inru sh dete ct or function.

User Inhibit Reylogic (graphical logic).

50N-n

>

Enable

50N-n

Setting 50N-n Delay

Wn-IL1

Wn-IL2

Wn-IL3

I

N

Inhibit 50N-n

&

50N-n Element

Enabled

Disabled

81HBL2

50N-n Inrush

Action

Off

Inhibit &General Pickup

User Inhibit 50N-n

Figure 3-7 Logic Diagram: Instantaneous Derived Earth Fault Element

Chapter 1) 7SR242 Duobias Description Of Operation

3.3.2 Time Delayed Derived Earth Fault Protection (51N)

Optionally two time delayed derived earth fault elements are provided, each can be selected to either winding 1 or

winding 2.

51N-n Setting sets the pick-up current level.

A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is

selected from IEC, ANSI or user defined curves using 51N-n Char. A time multiplier is applied to the

characteristic curves using the 51N-n Time Mult setting. Alternatively, a definite time lag delay (DTL) can be

chosen using 51N-n Char. When Delay (DTL) is selected the time multiplier is not applied and the 51N-n Delay

(DTL) setting is used instead.

The 51N-n Reset setting can apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is

significant where the characteristic has reset before issuing a trip output – see ‘App lic ati ons Guide’.

A minimum operate time for the characteristic can be set using the 51N-n Min. Operate Time setting.

A fixed additional operate time can be added to the characteristic using the 51N-n Follower DTL setting.

Operation of the time delayed earth fault eleme nts can be inhibit ed fr om:

Inhibit 51N-n A binary or virtual input.

51N-n Inrush Action: Inhibit Operation of the inrush detector function.

User Inhibit Reylogic (graphical logic).

General Pickup

51N-n

51N-n Setting

51N-n Charact

51N-n Time Mult

51N-n Min Operate Time

Enable

Wn-IL1

Wn-IL2

Wn-IL3

IN

51N-n Delay (DTL)

51N-n Follower DTL

c

Pickup

Operate

81HBL2

51N-n Inrush

Action

Off

Inhibit

51N-n Reset

&

Inhibit 51N-n

51N-n Element

Enabled

Disabled

User Inhibit 51N-n

Figure 3-8 Logic Diagram: Derived Time Delayed Earth Fault Protection

Chapter 1) 7SR242 Duobias Description Of Operation

3.4 Current Prot ection: Measur ed Earth Fault (50G, 51G)

The earth current is measured directly via dedicated current analogue inputs. These optional elements utilise

either RMS or Fundamental current values as defined by the 51G/50G Measurement setting (MEASURED E/F

menu).

3.4.1 Instantaneous Measured Earth Fault Protection (50G)

Optionally two instantaneous measured earth fault elements are provided, each can be selected to either winding

1 or winding 2.

Each instantaneous element has independent settings for pick-up current 50G-n Setting and a follower time

delay 50G-n Delay. The instantaneous elements have transient free operation.

Operation of the ins tant aneo us measured earth fault elements can be inhibited from:

Inhibit 50G-n A binary or virtual input.

50G-n Inrush Action: Inhibit O perat io n of the inrush detector function.

User Inhibit Reylogic (graphical logic).

>

Enable

50G-n Setting

IGn

51G/50G Measurement

50G-n

50G-n Delay

General Pickup

Inhibit 50G-n

&

50G-n Element

Enabled

Disabled

81HBL2

50G-n Inrush

Action

Off

Inhibit &

User Inhibit 50G-n

Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element

Chapter 1) 7SR242 Duobias Description Of Operation

3.4.2 Time Delayed Measured Earth Fault Protection (51G)

Optionally two time delayed measured earth fault elements are provided, each can be selected to either winding 1

or winding 2.

51G-n Setting sets the pick-up current level.

A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is

selected from IEC, ANSI or user defined curves using 51G-n Char. A time multiplier is applied to the

characteristic curves using the 51G-n Time Mult setting. Alternatively, a definite time lag (DTL) can be chosen

using 51G-n Char. W hen DTL i s select ed the tim e multip lier is not applied and the 51G-n Delay (DTL) setting is

used instead.

The 51G-n Reset setting can apply a definite time delayed or ANSI (DECAYING) reset. The reset mode is

significant where the characteristic has reset before issuing a trip output – see ‘App lic ati ons Guide’.

A minimum operate time for the characteristic can be set using 51G-n Min. Operate Time setting.

A fixed additional operate time can be added to the characteristic using 51G-n Follower DT L setting.

Operation of the time delayed measured earth fault elements can be inhibited from:

Inhibit 51G-n A binary or virtual input.

51G-n Inrush Action: Inhibit O perat io n of the inrush detector function.

User Inhibit Reylogic (graphical logic).

General Pickup

51G-n

IG

n

51G/50G Measurement

51G-n Setting

51G-n Charact

51G-n Time Mult

51G-n Min Operate Time

Enable

51G-n Delay (DTL)

51G-n Follower DTL

c

Pickup

Operate

51G-n Reset

81HBL2

51G-n Inrush

Action

Off

Inhibit

&

Inhibit 51G-n

51G-n Element

Enabled

Disabled

User Inhibit 51G-n

Figure 3-10 Logic Diagram: Time Delayed Measured Earth Fault Element (51G)

Chapter 1) 7SR242 Duobias Description Of Operation

3.5 Current Prot ection: High Impedance Restricted Earth

Fault (64H)

Two high impedance restricted earth fault elements are provided, one for each transformer winding

The relay utilises fundamental current measurement values for this function.

The single phase current input is derived from the residual output of line/neutral CTs connected in parallel. An

external stabilising resistor mus t be connected in series with this input to ensure that this element provides a high

impedance path.

64H Current Setting sets the pick-up current level. An output is given after elapse of the 64H Delay setting.

An external series stabilising resistor and a parallel connected voltage limiting non-linear resistor are used with

this function. See ‘Applications Guide’ for advice in specifying suitable component values.

Operation of the high imped an ce elem ent can be inhi bit ed from:

Inhibit 64H A binary or virtual input.

User Inhibit Reylogic (graphical log ic).

>

Enable

64H-n Current Setting

IG

64H-n

64H-n Delay

&

Inhibit 64H-n

64H-n Element

Enabled

Disabled

User Inhibit 64H-n

Figure 3-11 Logic Diagram: High Impedance REF (64H)

Chapter 1) 7SR242 Duobias Description Of Operation

3.6 Open Circuit (46BC)

Optionally two open circui t elements are provided, each can be selected to either winding 1 or winding 2.

The element calculates the ratio of NPS to PPS currents. Where the NPS:PPS current ratio is above 46BC

Setting an output is given after the 46BC Delay.

The Open Circuit function can be inhibited from

Inhibit 46BC A binary or virtual input .

Gn 46BC-n U/I Guarded O perat io n of the undercur r ent guar d fun ctio n.

User Inhibit Reylogic (graphical log ic).

46BC-n

Enable

&

46BC-n Setting

IL1

IL2

IL3

NPS

Filter I2

PPS

Filter I1

46BC-n Delay

46BC-n U/I

Guarded

Yes

<

46BC-n U/I

Guard Setting &

&

<

Inhibit 46BC-n

46BC-n Element

Enabled

Disabled

User Inhibit 46BC-n

Figure 3-12 Logic Diagram: Open Circuit Function (46BC)

Chapter 1) 7SR242 Duobias Description Of Operation

3.7 Current Prot ection: Negative Phase Sequence

Overcurrent (46NPS)

Optionally four NPS current elements are provided – 2 x 46IT and 2 x 46DT. Each element can be selected to

either winding 1 or winding 2.

The 46IT elements can be configured to be either definite time lag (DTL) or inverse definite minimum time (IDMT),

46IT Setting sets the pick-up current level for the element.

A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is

selected from IEC and ANSI curves using 46IT Char. A time multiplier is applied to the characteristic curves using

the 46IT Time Mult setting. Alternatively, a definite time lag delay (DTL) can be chosen using 46ITChar. W hen

Delay (DTL) is selected the time multiplier is not applied and the 46IT Delay (DTL) setting is used instead.

The 46IT Reset setting can ap ply a, definite time delayed or ANSI (DECAYING) reset.

The 46DT elements have a DTL characteristic. 46DT Setting sets the pick-up current and 46DT Delay the

follower time delay.

Operation of the negative phase sequence overcurrent elements can be inhibited from:

Inhibit 46IT A binary or virtual input.

Inhibit 46DT A binary or virtual input.

User Inhibit Reylogic (graphical log ic).

46IT-n

46IT Setting

46IT Char

46IT Time Mult

46IT Delay (DTL)

46IT Reset

Wn-IL1

Wn-IL2

Wn-IL3

NPS

>

c

46DT Setting

I2

General Pickup

En.

Pickup

Operate

46DT-n

46DT-n Delay

General Pickup

&

Inhibit 46IT-n

46IT-n Element

Enabled

Disabled

User Inhibit 46IT-n

&

Inhibit 46DT-n

46DT-n Element

Enabled

Disabled

User Inhibit 46DT-n

Figure 3-13 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)

Chapter 1) 7SR242 Duobias Description Of Operation

3.8 Current Prot ection: Under-Current (37, 37G)

Optionally two under-current elements are provided for both line and measured earth current, each can be

selected to either winding 1 or winding 2.

Each phase has an independent level detector and current-timing element. 37-n Setting sets the pick-up current.

An output is given after elapse of the 37-n Delay setting.

Operation of the under-current elements can be inhibited from:

Inhibit 37(G)-n A binary or virtual input.

Gn 37-n U/I Guarded Operation of the under current guard functio n.

Inhibit 37(G)-n A binary or virtual input.

User Inhibit 37(G)-n Reylogic (graphical log ic).

≥137-n

37-n Delay

37-n Setting

Enable

<

Wn IL1

Wn IL2

Wn IL3

37-n U/I

Guarded

Yes

<

37-n U/I Guard

Setting

&

<

≥

1

Ig-n 37G-n

37G-n Delay

37G-n Setting

Enable

<

Inhibit 37-n

37-n Element

Enabled

Disabled

User Inhibit 37-n

&

Inhibit 37G-n

37G-n Element

Enabled

Disabled

User Inhibit 37G-n

Figure 3-14 Logic Diagram: Undercu rrent Detector (37, 37G)

Chapter 1) 7SR242 Duobias Description Of Operation

3.9 Current Prot ection: Thermal Overload (49)

Optionally a phase segregated thermal overload element is provided, this can be selected to either winding 1 or

winding 2. The thermal state is calculated using the mea sure d True RMS current.

Should the current rise above the 49 Overload Setting for a defined time an output signal will be initiated.

Operate Time (t):-

()













×−

−

×=

2

B

2

P

2

IkI II

tln

τ

Where

T = Time in minutes

τ = 49 Time Constant setting (minutes)

In = Log Natural

I = measured current

IP = Previous steady state current level

k = Constant

IB = Basic current, typically the same as In

k.IB = 49 Overload Setting (Iθ)

Additionally, an alarm can be given if the thermal state of the system exceeds a specified percentage of the

protected equ ipment’s thermal capacity 49 Capacity Alarm setting.

For the heating curve:

100%)e

(1

I

θ

τ

t

2

θ

2

×−

⋅=

−

Where: θ = thermal state at time t

I = measured thermal current

Iθ = 49 Overload setting (or k. IB)

The final steady state thermal condition can be predicted for any steady state value of input current where t >τ,

100%

I

θ2

θ

2

F×=

Where: θF = final thermal state before disconnection of device

49 Overload Setting Iθ is expressed as a multiple of the relay nominal current and is equivalent to the factor k.I B

as defined in the IEC255-8 thermal operating characteristics. It is the value of current above which 100% of

thermal capacity will be reached after a period of time and it is therefore normally set slightly above the full load

current of the protected device.

The thermal state may be reset from the fascia, a user logic reset or externally via a binary input.

Thermal overload protection can be inhibited from:

Inhibit 49 A binary or virtual input.

User Inhibit Reylogic (grap hi cal log ic).

Chapter 1) 7SR242 Duobias Description Of Operation

Wn-IL149 Alarm

49 Trip

49 Time Constant

49 Overload Setting

Enable

cap alarm

trip

Wn-IL2

Wn-IL3

cap alarm

trip

cap alarm

trip

≥1

49 Capacity Alarm

≥1

&

Inhibit 49

49 Element

Enabled

Disabled

User Inhibit 49

Reset 49

User Reset 49 ≥1

C

Figure 3-15 Logic Diagram: Thermal Overload Protection (49)

Chapter 1) 7SR242 Duobias Description Of Operation

3.10 Voltage Prot ection: Over Fluxi ng (24)

Optionally, three over fluxing elements are provided – 2 x 24DT and 1 x 24IT Char elements.

The 24DT Elements have a DTL characteristic. 24DT Setting sets the pick-up level and 24DT Delay the follower

time delay. An output is given if the Volts/Hertz ratio is above setting for the duration of the delay. The 24DT-n

Hysteresis setting allows the user to vary the pick-up/drop-o f f ratio for the ele ment .

The 24IT Element has a user definable shape.

24Xn Point Setting sets the over fluxing (V/f) level for up to 7 user definable points.

24Yn Point Setting sets the operate time for each of th e defined points.

The 24IT Reset setting can ap ply a, definite time delayed reset.

Y (secs)

X - (V/f)

X0

Y0

X6

Y6

X0, Y0 point

defines

curve pick-up

X6, Y6 point

defines

curve cut-off

X

Straight-line

between points

Figure 3-16 Inverse Over-fluxing Characteristic (24IT)

Operation of the ov er fluxing element s can be inhibited from:

Inhibit 24IT A binary or virtual input.

Inhibit 24DT-n A binary or virtual input.

User Inhibit Reylogic (graphical log ic).

Chapter 1) 7SR242 Duobias Description Of Operation

General Pickup

24DT-2

24DT-2 Hysteresis

24DT-2 Delay

Enable

24DT-2 Setting

V

General Pickup

24IT-Char

24IT Char Point Yn

Enable

24IT Char Point Xn

24IT Char Reset

>

cPickup

trip

General Pickup

24DT-1

24DT-1 Hysteresis

24DT-1 Delay

Enable

24DT-1 Setting

>

&

Inhibit 24DT-1

24DT-1 Element

Enabled

Disabled

User Inhibit 24DT-1

&

Inhibit 24DT-2

24DT-2 Element

Enabled

Disabled

User Inhibit 24DT-2

&

Inhibit 24IT Char

24IT Char

Enabled

Disabled

User Inhibit 24IT Char

Figure 3-17 Logic Diagram: Overfluxing Elements (24)

Chapter 1) 7SR242 Duobias Description Of Operation

3.11 Voltage Prot ection: Under/Over Voltage (27/5 9)

Optionally four under/over voltage elements are provided.

The relay utilises fundamental voltage measurement values for this function.

27/59-n Setting sets the pick-up voltage level for the element.

The sense of the element (undervoltage or overvoltage) is set by the 27/59-n Operation setting.

Voltage eleme nts are block ed if the measured volt age fal ls below the 27/59 U/V Guard setting.

An output is given after elapse of the 27/59-n Delay setting.

The 27/59-n Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.

Operation of the under/over voltage elements can be inhibited from:

Inhibit 27/59-n A binary or virtual input.

27/59-n U/V Guarded Under voltage guard element.

User Inhibit Reylogic (graphical logic).

27/59-n U/V

Guarded

Yes

Vor> <

General Pickup

27/59-n

27/59-n Hysteresis

27/59-n Delay

Enable

27/59-n Setting

27/59-n Operation

<

27/59 U/V Guard

Setting

&

Inhibit 27/59-n

27/59-n Element

Enabled

Disabled

User Inhibit 27/59-n

Figure 3-18 Logic Diagram: Under/Over Voltage Elements (27/59)

Chapter 1) 7SR242 Duobias Description Of Operation

3.12 Voltage Prot ection: Neutral Overvoltage (59N)

Optionally two Neutral Overvoltage (or Neutral Voltage Displacement) elements are provided.

One of the elements can be configured to be either definite time lag (DTL) or inverse definite minimum time

(IDMT),

59NIT Setting sets the pick-up voltage level (3V0) for the element.

An inverse definite minimum time (IDMT) can be selected using 59NIT Char. A time multiplier is applied to the

character ist ic curv es using the 59NIT Time Mult setting (M):

[ ]













−

=1

M

tVs

3Vo

op

Alternatively, a definite time lag delay (DTL) can be chosen using 59NITChar. When Delay (DTL) is selected the

time multiplier is not applied and the 59NIT Delay (DTL) setting is used instead.

An instantaneous or definite time delayed reset can be applied using the 59NIT Reset setting.

The second element has a DTL characteristic. 59NDT Setting sets the pick-up voltage (3V 0) and 59NDT Delay

the follower time delay.

Operation of the neutral overvoltage elements can be inhibited from:

Inhibit 59NIT A binary or virtual input.

Inhibit59NDT A binary or virtual input.

User Inhibit Reylogic (graphical log ic).

It should be noted that neutral voltage displacement can only be applied to VT arrangements that allow zero

sequence flux to flow in the core i.e. a 5-limb VT or 3 single phase VTs. The VT primary winding neutral must be

earthed to allow the flow of zer o sequen ce current.

59NIT

59NIT Setting

59NIT Charact

59NIT Time Mult

59NIT Delay (DTL)

59NIT Reset

59NDT

>

En.

59NDT Setting 59NDT Delay

V = 3Vo

General Pickup

En.

Pickup

Operate

&Inhibit 59NIT

59NIT Element

Enabled

Disabled

User Inhibit 59NIT

&

Inhibit 59NDT

59NDT Element

Enabled

Disabled

User Inhibit 59NDT

Chapter 1) 7SR242 Duobias Description Of Operation

Figure 3-19 Logic Diagram: Neutral Overvoltage Element

Chapter 1) 7SR242 Duobias Description Of Operation

3.13 Voltage Prot ection: Under/Over Frequency (81)

Optionally six under/over frequency elements are provided.

Frequency elements are blocked if the measured voltage falls below the 81 U/V Guard setting.

The sense of the element (under-frequency or over-frequency) is set by the 81-n Operation setting.

81-n Setting sets the pick-up frequency for the element.

An output is given after elapse of the 81-n Delay setting.

The 81-n Hysteresis setting allows the user to vary the pick-up/drop-off ratio for the element.

Operation of the under /ov er frequency elements can be inhibi ted from :

Inhibit 81-n A binary or virtual input.

81-n U/V Guarded Under voltage guard element.

User Inhibit Reylogic (graphical logic).

or

> <

General Pickup

81-n

81-n Hysteresis

81-n Delay

Enable

81-n Setting

81-n Operation

V

81-n U/V

Guarded

Yes

<

81-n U/V Guard

Setting

&

Inhibit 81-n

81-n Element

Enabled

Disabled

User Inhibit 81-n

Figure 3-20 Logic Diagram: Under/Over Frequency Detector (81)

Chapter 1) 7SR242 Duobias Description Of Operation

Section 4: Control & Logic Functions

4.1 Quick Logic

The ‘Quick Logic’ feature allows the user to input up to 16 logic equations (E1 to E16) in text format. Equations

can be entered using Reydisp or at the relay fascia.

Each logic equation is built up from text representing control characters. Each can be up to 20 characters long.

Allowable chara cters are:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Digit

( ) Parenthesis

! ‘NOT’ Function

. ‘AND’ Function

^ ‘EXCLUSIVE OR’ Function

+ ‘OR’ Function

En Equation (number)

Fn Function Key (number)

‘1’ = Key pressed, ‘0’ = Key not pressed

In Binary Input (number)

‘1’ = Input energised, ‘0’ = Input de-energised

Ln LED (number)

‘1’ = LED energised, ‘0’ = LED de-energised

On Binary output (number)

‘1’ = Output ener gis ed, ‘0’ = Output de-energised

Vn Virtual Input/Output (number)

‘1’ = Virtual I/O energised, ‘0’ = Virtual I/O de-energised

Example Showing Use of Nomenclature

E1= ((I1^F1).!O2)+L1

Equation 1 = ((Binary Input 1 XOR Function Key 1) AND NOT Binary Output 2)

OR

LED 1

When the equation is satisfied (=1) it is routed through a pick-up timer (En Pickup Delay), a drop-off timer (En

Dropoff Delay), and a counter which instantaneously picks up and increments towards its target (En Counter

Target).

The counter will either maintain its count value En Counter Reset Mode = OFF, or reset after a time delay:

En Counter Reset Mode = Single Shot: The En Counter Reset Time is started only when the counter

is first incremented (i.e. counter value = 1) and not for subsequent counter operations. Where En

Counter Reset Time elapses and the count value has not reached its target the count value is reset to

zero.

En Counter Reset Mode = Multi Shot: The En Counter Reset Time is started each time the counter is

incremented. W here En Counter Reset Time elapses without further count increments the count value

is reset to zero.

Chapter 1) 7SR242 Duobias Description Of Operation

P.U. DELAY

D.O. DELAY

T

Counter Value 1 2

Increment

Counter

Equation Output 1 0 1 0 1 For Counter Target = 2

En = 1

Equation nP.U. DELAY D.O. DELAY Counter En = 1

Counter

= Target Value

Figure 4-1 Sequence Diagram showing PU/DO Timers in Quick Logic (Counte r Reset Mode Off)

When the count value = En Counter Target the output of the counter (En) = 1 and this value is held until the

initiating conditions are removed when En is instantaneously reset.

The output of En is assigned in the OUTP UT C ONFI G>OU TPUT MA TRIX menu where it can be programmed to

any binary output (O), LED (L) or Virtual Input/Output (V) combination.

Protection functions can be used in Quick Logic by mapping them to a Virtual Input / Output.

Refer to Chapter 7 – Applications Guide for examples of Logic schemes.

Chapter 1) 7SR242 Duobias Description Of Operation

Section 5: Supervisi on Functions

5.1 Circuit Breaker Failure (50BF)

Two CB Fail elements are provided – one element per winding.

Each circuit breaker fail function has two time delayed outputs that can be used for combinations of re-tripping or

back-tripping. CB Fail outputs are given after elapse of the 50BF-n-1 Delay or 50BF-n-2 Delay settings. The two

timers run concurrently.

The circuit breaker fail protection time delays are initiated either from:

An output Trip Contact of the relay (MENU: OUTPUT CONFIG\BINARY OUTPUT CONFIG\CBn Trip

Contacts), or

A binary or virtual input assigned to 50BF-n Ext Trip (MENU: INPUT CONF IG\INPUT MATRI X\50BF Ext

Trip).

A binary or virtual input assigned to 50BF-n Mech Trip (MENU: INPUT C ONFIG\I NPU T MA TRI X\ 50BF-

n Mech Trip).

CB Fail outputs will be issued providing any of the 3 phase currents are above the 50BF-n Setting or the current

in the fourth CT is above 50BF-n-I4 for longer than the 50BF-n-n Delay setting, or for a mechanical protection trip

the circuit breaker is still closed when the 50BF-n-n Delay setting has expired – indicating that the fault has not

been cleared.

Both 50BF-n-1 and 50BF-n-2 can be mapped to any output contact or LED.

If the 50BF-n CB Faulty input (MENU: INPUT CONFIG\INPUT MATRIX\CB Faulty) is energised when a CB trip

is given the time delays 50BF-n-n Delay will be by-passed a nd the output giv en immediately.

Operation of the CB Fail elements can be inhibited from:

Inhibit 50BF-n A binary or virtual input.

User Inhibit Reylogic (graphical log ic).

Chapter 1) 7SR242 Duobias Description Of Operation

Trip Contact

50BF-n-1

50BF-n-2

≥1

Wn-IL1 >

50BF-n Setting

50BF-n Element

Enabled

Disabled

50BF-n-1 Delay

50BF-n-2 Delay

Inhibit 50BF-n

&

50BF-n Ext Trip

Wn-IL3

Wn-IL2

&

50BF-n CB Faulty

≥1

CB-n Closed

≥1

50BF-n Mech Trip

&

Ig-n >

50BF-n-I4 Setting

≥1

&

User Inhibit 50BF-n

Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF)

Chapter 1) 7SR242 Duobias Description Of Operation

5.2 Trip/Close Circuit Supervision (74TCS/74CCS)

The relay provides six trip and six close circuit supervision elements, all elements are identical in operation and

independent from each other allowing 6 trip and 6 close circuits to be monitored.

One or more binary inputs can be mapped to 74TCS-n/74CCS-n. The inputs are connected into the trip circuit

such that at least one input is energised when the trip circuit wiring is intact. If all mapped inputs become de-

energised, due to a break in the trip circuit wiring or loss of supply an output is given.

The 74TCS-n Delay or 74CCS-n Delay setting prevents failure being incorrectly indicated during circuit breaker

operation. This delay should be greater than the operating time of the circuit breaker.

The use of one or two binary inputs mapped to the same Circuit Supervision element (e.g. 74TCS-n) allows the

user to realise several alternative monitoring schemes – see ‘Applications Guide’.

74TCS-n

Disabled

Enabled &

74TCS-n

User Inhibit 74TCS-n

74TCS-n Delay

&

74TCS

Notes

For details of data communications points refer to Technical Manual, Chapter 4 (Data

Communications).

For details of user logic inputs and outputs refer to the relevant Reydisp Manager template.

Figure 5-2 Logic Diagram: Trip Circuit Supervision Feature (74TCS)

CCS-n

Enabled

Disabled

&

74CCS-n

74CCS-n Delay

≥1

74CCS-n NOTE: Diagram shows two binary inputs mapped

to the same Close Circuit Supervision element

74CCS-n

Figure 5-3 Logic Diagram: Close Circuit Supervision Feature (74CCS)

Chapter 1) 7SR242 Duobias Description Of Operation

5.3 Inrush Detector (81HBL2)

Inrush detector elements monitor the line currents.

The inrush detector can be used to block the operation of selected elements during transformer magnetising

inrush conditions.

The 81HBL2 Bias setting allows the user to select between Phase, Sum and Cross meth ods of measur e ment:

Phase Each phase is inhibited separately.

Sum With this method the square root of the sum of the squares of the second harmonic in each

phase is compared to each operate curre nt indiv id ually.

Cross All phases are inhibited when any phase detects an inrush condition.

An output is initiated where the measured ratio of second harmonic to fundamental current component content is

above the 81HBL2 setting. An LED assigned to this function operates instantaneously, whereas an output relay

assigned to this function operates after a 60ms time delay.

81HBL2 Element

Enabled

Disabled

IL1

IL2

IL3

81HBL2 Bias

L2 81HBL2

81HBL2 Setting

c

>

L1 81HBL2

L3 81HBL2

>181 HBL2

Figure 5-4 Logic Diagram: Inrush Detector Feature (81HBL2)

Chapter 1) 7SR242 Duobias Description Of Operation

5.4 Over Fluxing Detector (81HBL5)

Over fluxing detector elements monitor the line currents.

The over fluxing detector can be used to block the operation of differential protection (87BD/ 87HS) elements.

The 81HBL5 Bias setting allows the user to select between Phase, Sum and Cross methods of meas urement:

Phase Each phase is inhibited separately

Sum The inrush current from each phase is summated and compared to each operate current

individually

Cross All phases are inhibited when any phase detects an inrush condition

An output is given where the measured fifth harmonic component content is above the 81HBL5 setting.

IL1

IL2

IL3

81HBL5 Bias

L2 81HBL5

81HBL5 Setting

c

>

L1 81HBL5

L3 81HBL5

81HBL5 Element

Enabled

Disabled

>181 HBL5

Figure 5-5 Logic Diagram: Overfluxing Detector Feature (81HBL5)

Chapter 1) 7SR242 Duobias Description Of Operation

Section 6: Other Features

6.1 Data Com m unications

Two communication ports, COM1 and COM2 are provided as standard. RS485 connections are available on the

terminal blocks at the rear of the relay (COM1). A USB port, COM 2, is provided at the front of the relay for local

access using a PC.

Optionally, additional communication ports are available: -

2 x fibre optic communication serial ports with ST connectors (COM 3 and COM 4) plus 1 x IRIG B

1 RS232 serial port (COM 3) plus IRIG B

1 x RS485 serial port (COM 3) plus IRIG B

2 x Electrical Ethernet with RJ45 connectors IEC 61850 - (COM 3 and COM 4),

2 x Optical Ethernet Duplex LC connect or s IEC 618 50 - (COM 3 and COM 4).

Communication is compatible with Modbus-RTU, IEC60870-5-103 FT 1.2, DNP 3.0, and IEC60870-5-101

transmission and application standards for all serial ports and IEC 61850 for Ethernet ports.

Reydisp Manager provides the functionality of Reydisp Evolution and also provides project management of

multiple devices to allow engineering of IEC61850 projects

Communication with the relay from a personal computer (PC) is facilitated by the REYDISP EVOLUTION

software package. The program allows the transfer of relay settings, waveform records, event records, fault data

records, Instruments/meters and control functions. REYDISP EVOLUTION is compatible with IEC60870-5-103.

Data communications operation is described in detail in Chapter 4 of this manual.

6.2 IEC 61850 Communicat ions

The relay can optionally be provided with IEC61850 comms.

The 61850 comms can be user configured to provide HSR, PRP and RSTP operation.

For further details refer to the following publications:

IEC 61850 Model Implementation Conformance Statement (MICS)

IEC 61850 PIXIT, PICS, TICS

Protocol Implementation Conformance Statement (PICS), Protocol Implementation Extra Information for

Testing (PIXIT) and Technical Issues Implementation Conformance Statement (TICS),

Chapter 1) 7SR242 Duobias Description Of Operation

6.3 Maintenance

6.3.1 Output Matrix Test

The feature is available from the Relay fascia and allows the user to operate binary outputs or LEDs assigned to

relay functions.

Any protection function which is enabled in the setting menu will appear in the Output Matrix Test.

6.3.2 CB Counters

Four CB trip counters are provided:

CB1 Total Trip Count:

Increments on each trip command issued.

CB1 Delta Trip Count:

Additional counter which can be reset independently of the

Total Trip Counter. This can be used, for example, for

recording trip operations betw een visits to a substation.

CB2 Total Trip Count

As CB1

CB2 Delta Trip Count:

As CB1

The status of each counter can be viewed in the INSTRUMENTS mode.

Binary outputs can be mapped to each of the above counters, these outputs are energised when the

user defined Count Target is reached.

6.3.3 I2t CB Wear

CB1 and CB2 wear counters are also provided:

I2t CB1 Wear:

Provides an estimate of contact wear and maintenance

requirements.

The algorithm works on a per phase basis,

measuring the arcing current during faults. The I2t value at

the time of trip is added to the previously stored value and an

alarm is given when any one of the three phase running

counts exceeds the set Alarm limit . The t value is the time

between CB contacts separation when an arc is formed,

Separation Time, and the CB Clearance time.

I

2

t CB2 Wear:

As CB1

The status of each counter can be viewed in the INSTRUMENTS mode.

Binary outputs can be mapped to each of the above counters, these outputs are energised when the

user defined Alarm Limit is rea ched.

Chapter 1) 7SR242 Duobias Description Of Operation

6.4 Data Storage

6.4.1 General

The relay stores three types of data records: relay event records, analogue/digital waveform records and fault

data records. These data records are backed up in non-volatile memory and are permanently stored even in the

event of loss of auxiliary d.c. supply voltage.

6.4.2 Event Records

The event recorder feature allows the time tagging of any change of state (Event) in the relay. As an event

occurs, the actual event condition is logged as a record along with a time and date stamp to a resolution of 1

millisecond. There is capacity for a maximum of 5000 event records that can be stored in the relay and when the

event buffer is full any new record will over-write the oldest. Stored events can be erased using the DATA

STORAGE>Clear Events setting.

The following ev ents are logg ed:

Change of state of Binary outputs.

Change of state of Binary inputs.

Change of Settings and Settings Group

Change of state of any of the control functions of the relay.

All events can be uploaded over the data communications channel(s) and can be displayed in the ‘ReyDisp

Evolution’ package in chronological order, allowing the sequence of events to be viewed. Events are also made

available spontaneously to an IEC 60870-5-103 or Modbus RTU compliant control system.

For a complete listing of events available in each model, refer to Technical Manual Chapter 4 ‘Data Comms’.

6.4.3 Waveform Records.

Waveform records provide a trace of the insta ntan eous magnitude of each analo gue inp ut chan nel and the status

of each binary channel i.e. each binary input, binary output, virtual I/O and LED, against time for the duration of

the record. The values are recorded at every digital sampling point used by the relay software.

Each recorded analogue waveform displays an input identifier, minimum value, maximum value and the

instantaneous values at both cursor positions (user variable). Each binary waveform displays the input/output

number and the initiating condition(s) e.g. external input or protection element.

Triggering of waveform storage is configured from the ‘Settings > DATA STORAGE > WAVEFORM STORAGE’

menu. Triggering is automatically initiated from operation of any of the selected protection or control elements.

Waveform storage can also be triggered from the relay fascia, from a suitably programmed binary input or via the

data comms chann el(s) .

Waveforms are sampled at a rate of 32 samples per cycle.

The latest 100 records are stored, the most recent is waveform 1. Records are archived by the relay during

quiescent periods. The duration of each stored record is 1s, 2s, 5s or 10s. The percentage of waveform storage

prior to waveform triggering is user configurable. When the waveform archive buffer is full (i.e. 100 records are

stored) the triggering of a new waveform record causes the oldest record - waveform 100 – to be overwritten.

Stored waveforms can be deleted from the relay fascia using the DATA STORAGE > Clear Waveforms setting or

via Reydisp.

Chapter 1) 7SR242 Duobias Description Of Operation

6.4.4 Fault Data Records

Measured quantities for the last 100 relay trip fault records are stored with time and date of trip.

The HMI LCD can display the latest 10 fault records with time and date of trip, measured quantities and LED

status. The Max Fault Rec. Time setting sets the time period from fault trigger during which the operation of any

LEDs is recorded.

Records are triggered from operation of an output relay programmed as a ‘CBn Trip Contact’. The ‘Trip Alert’

feature must also be enabled.

To achieve accurate instrumentation values for the fault records when testing, ensure a drop off delay is applied

to the test set so that the injected quantities remain on for a short duration, typically 20ms, after the relay has

issued the trip output. This extended period of injection simulates the behaviour of the power system where

faulted conditions are present until CB operation.

Where examined together the event records and the fault records will detail the full sequence of events leading to

a trip.

Fault records are stored in a rolling buffer, with the oldest faults overwritten. The fault storage can be cleared with

the DATA STORAGE>Clear Faults setting.

The SYSTEM CONFIG > Trip Alert = Disabled setting allows the above to be switched off e.g. during

commissioning tests.

6.4.5 Demand

Maximum, minimum and mean values of line currents and voltage (where applicable) are available as instruments

which can be read in the relay INSTRUMENTS MENU or via Reydisp.

The DATA STORAGE > DEMAND DATA LOG > Data Log Period setting is used to define the time/duration

after which the instrument is updated. The updated value indicates the maximum, minimum and mean values for

the defined period.

The Gn Demand Window setting defines the maximum period of time over which the demand values are valid. A

new set of demand values is established after expiry of the set time.

The Gn Demand Window Type can be set to FIXED, PEAK or ROLLING.

When set to FIXED the maximum, minimum and mean values demand statistics are calculated over

fixed Window duration. At the end of each window the internal statistics

are reset and a new window is started.

When set to PEAK the maximum and minimum values within the Demand Window time setting is

recorded.

When set to ROLLING the max imum, minimum and me an va lues deman d stati sti cs are cal c ulate d over

a moving Window duration. The internal statistics

are updated when the window advances every Updated Period.

The statistics can be reset from a binary input or communication command, after a reset the update period and

window are immediately restarted.

6.4.6 Demand/Da ta Log

The Data log feature can be used to build trend and demand records.

Up to 10,080 values for each phase current (W1 and W 2) and voltage (where fitted) analogue are recorded. Each

recorded value consists of the mean value of the sampled data over the Data Log Period.

Stored Data Log records are retrieved using Reydisp.

Chapter 1) 7SR242 Duobias Description Of Operation

6.5 Metering

The metering feature provides real-time data available from the relay fascia in the ‘Instruments Mode’ or via the

data communic atio ns inte rf ac e .

For a detailed description refer to Technical Manual Chapter 2 – Se ttings and Inst ruments.

6.6 Opera ting Mode

The relay has three operating modes, Local, Remote and Out of Service. The following table identifies the

functions operation in each mode.

The modes can be selected by the following methods:

SYSTEM CONF IG>RELAY MODE setting, a Binary Input or Command

OPERATION REMOTE LOCAL OUT OF SE RV ICE

Control

Rear Serial Ports (when set as Remote)

Enabled

Disabled

Rear Serial Ports (when set as Local)

Disabled

Enabled

Disabled

Fascia (Control Mode)

Disabled

Enabled

Disabled

USB

Disabled

Enabled

Disabled

Binary Inputs

Setting Option

Enabled

Binary Outputs

Enabled

Disabled

Reporting

Spontaneous

IEC 103

Enabled

Disabled

DNP3

Enabled

Disabled

General Interrogation

IEC 103

Enabled

Disabled

DNP3

Enabled

Disabled

MODBUS

Enabled

Changing of Settings

Rear Ports (when set as Remote)

Enabled

Disabled

Enabled

Rear Ports (when set as Local)

Disabled

Enabled

Fascia

Enabled

USB

Disabled

Enabled

Historical Inf or mati on

Waveform Records

Enabled

Event Records

Enabled

Fault Informat ion

Enabled

Setting Information

Enabled

Table 6-1 Operating Mode

6.7 Control Mode

This mode provides convenient access to commonly used relay control and test functions. When any of the items

listed in the control menu are selected control is initiated by pressing the ENTER key. The user is prompted to

confirm the action, again by pressing the ENTER key, before the command is executed.

Control Mode commands are password protected using the Control Password function – see Section 6.10.

Chapter 1) 7SR242 Duobias Description Of Operation

6.8 Real Time Clock

Time and date can be set either via the relay fascia using appropriate commands in the System Config menu, via

the data comms channel(s) or via the optional IRIG-B input.

In order to maintain synchronism within a substation, the relay can be synchronised to the nearest second or

minute using the IEC 60870-5-103 protocol, optional IRIG-B input or binary input.

The default date is set at 01/01/2000, this indicates that no date has been set. When editing the Time, only the

hours and minutes can be edited. The seconds are zeroed by pressing ENTER and the clock begins running.

The time and date are maintained while the relay is de-energised by a back up storage capacitor. The length of

time for which this data will be maintained will depend on such things as temperature, length of time in service,

etc. However the data will be maintained for a minimum of 1.8 days.

6.8.1 Time Synchronisation – Data Comms

Where the data comms channel(s) is connected to a dedicated substation automation system the relay can be

time synchronised using the relevant command within IEC 60870-5-103 or optional DNP3.0 protocols. The time

can also be synchronised from ‘Reydisp Evolution’ which utili ses the communications support software.

6.8.2 Time Synchronisation – Binary Input

A binary input can be mapped Clock Sync from BI. The seconds or minutes will be rounded up or down to the

nearest value when the BI is energised. This input is leading edge triggered.

6.8.3 Time Synchronisation – IRIG-B (Optional)

A BNC connector on the relay rear provides an isolated IRIG-B time synchronisation port. The IRIG-B input is

compatible with a modulated 3-6 Volt signal and provides time synchronisation to the nearest millisecond.

6.9 Settings Gr oups

The relay provides eight groups of settings – Group number (Gn) 1 to 8. At any one time only one group of

se ttings can be ‘active’ – SYSTEM CONFIG>Active Group setting.

It is possible to edit one group while the relay operates in accordance with settings from another ‘active’ group

using the View/Edit Group setting.

Some settings are independent of the active group setting i.e. they apply to all settings groups. This is indicated

on the top line of the relay LCD – where only the Active Group No. is identified. Where settings are group

dependent this is indicated on the top line of the LCD by both the Active Group No. and the View Group No.

being displayed.

A change of settings group can be achieved either locally at the relay fascia, remotely over the data comms

channel(s) or via a binary input. When using a binary input an alternative settings group is selected only whilst the

input is energised (Select Grp Mode: Level triggered) or latches into the selected group after energisation of the

input (Select Grp Mode: Edge triggered).

Chapter 1) 7SR242 Duobias Description Of Operation

6.10 Password Feature

The relay incorporates two levels of password protection – one for settings, the other for control functions.

The programmable password feature enables the user to enter a 4 character alpha numeric code to secure

access to the relay functions. The relay is supplied with the control password set to AAAA. The settings pa ssw or d

is supplied set to NONE, i.e. the password feature is disabled.

Passwords must be entered twice as a security measure against accidental change. Once a password has been

entered then it will be required thereafter to change settings or initiate control commands. Passwords can be de-

activated by using the password to gain access and by entering the password NONE. Again this must be entered

twice to de-activate the security system.

As soon as the user attempts to change a setting or initiate control the password is requested before any changes

are allowed. Once the password has been validated, the user is ‘logged on’ and any further changes can be

made without re-entering the password. If no more changes are made within 1 hour then the user will

automatically be ‘logged off’, re-enabling the password feature.

The Settings Password prevents unauthorised changes to settings from the front fascia or over the data comms

channel(s). The Control Password prevents unauthorised operation of controls in the relay Control Menu from the

front fascia.

The password validation screen also displays a numerical code. If the password is lost or forgotten, this code

should be communicated to Siemens Protection Devices Ltd. and the password can be retrieved.

Chapter 1) 7SR242 Duobias Description Of Operation

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

The copyright and other intellectual property rights in this document, and in any model or article produced from it

(and including any registered or unregistered design rights) are the property of Siemens Protection Devices

Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval

system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be

reproduced from this document unless Siemens Protection Devices Limited consent.

While the information and guidance given in this document is believed to be correct, no liabili ty shal l be acc epte d

for any loss or damage caused by any error or omission, whether such error or omission is the result of

negligence or any other cause. Any and all such liability is disclaimed.

7SR242 Duobias

Multi-Function 2-Winding Transformer Protection Relay

Settings, Configuration & Instruments

Document Release History

This document is is sue 2017/08. The list of revisions up to and including this issue is:

2017/08 Software revision 2662H85001 R8c-7d

2013/01 Software revision 2662H85001 R7c-7b

2012/08 Addition of optional IEC 61850 communication protocol and Ethernet Int erfac e.

2010/06 Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and typographical

revisions

2010/02 Document reformat due to rebrand

2010/02 Software revision 2662H80001 R4c-3

2008/07 Software revision 2662H80001R3d-2c.

2008/05 First issue

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

Contents

Section 1: Introduction ............................................................................................................................................. 5

1.1 Relay Menus And Display ....................................................................................................................... 5

1.2 Operation Guide ...................................................................................................................................... 6

1.2.1 User Interface Operation ........................................................................................................... 6

1.3 Settings Display ...................................................................................................................................... 8

1.4 Instruments Mode ................................................................................................................................... 8

1.5 Fault Data Mode ................................................................................................................................... 16

Section 2: Setting the Relay Using Reydisp ........................................................................................................... 17

2.1 Physical Connection ............................................................................................................................. 17

2.1.1 Front USB connection ............................................................................................................. 17

2.1.2 Rear RS485 connectio n .......................................................................................................... 18

2.1.3 Optional rear fibre optic connection ........................................................................................ 18

2.1.4 Optional rear RS485 + IRIG-B connection .............................................................................. 19

2.1.5 Optional rear RS232 + IRIG-B connection .............................................................................. 19

2.1.6 Optional Rear EN100 Ethernet Module (COM3) ..................................................................... 20

2.1.7 Configuring Relay Data Communication ................................................................................. 21

2.1.8 Connecting to the Relay via Reydisp ...................................................................................... 22

APPENDIX 1 7SR242 Settings

List of Figures

Figure 1-1 Menu ................................................................................................................................................. 5

Figure 1-2 Fascia Contrast symbol .................................................................................................................. 5

Figure 1-3 Fascia of 7SR242 Relay .................................................................................................................... 5

Figure 1-4 Relay Identifier Screen .................................................................................................................... 6

Figure 1-5 7SR24 Menu Structure ...................................................................................................................... 7

Figure 1-6 Schematic Diagram: Current and Voltage Meters (in clud es o ption al func tion ali t y ) ......................... 12

Figure 2-1 USB connection to PC .................................................................................................................. 17

Figure 2-2 RS485 connection to PC ............................................................................................................... 18

Figure 2-3 Fibre Optic Connection to PC ...................................................................................................... 18

Figure 2-4 EN100 Ethernet Module .................................................................................................................. 20

Figure 2-5 PC Comms Port Allocation ........................................................................................................... 22

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

Section 1: Introduction

1.1 Relay Menus And Display

All relay fascias contain the same access keys although the fascias may differ in appearance from model to

model. The basic menu structure is also the same in all products and consists of four main menus, these being,

Settings Mode - allows the user to view and (if allowed via the settings mode password) change settings in the

relay.

Instruments Mode - allows the user to view the relay meters e.g. current, volt age etc.

Fault Data Mode - allows the user to see type and data of any fault that the relay has detected.

The menus can be viewed via the LCD by pressing the access keys as below,

Pressing CANCEL returns to the Relay Identifier screen

Relay Identifier

SETTINGS

MODE INSTRUMENTS

MODE FAULT DATA

MODE

TEST/

RESET TEST/

RESET

CONTROL

MODE

TEST/

RESET

Figure 1-1 Menu

LCD Contrast

To adjust the contrast on the LCD insert a flat nosed screwdriver into the screw below the contrast symbol,

turning the screw left or right decreases and increases the contrast of the LCD.

Figure 1-2 Fascia Contrast symbol

Figure 1-3 Fascia of 7SR242 Relay

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

1.2 Operation Guide

1.2.1 User Interface Operation

The basic menu structure flow diagram is shown in Figure 1.2-2. This diagram shows the main modes of display:

Settings Mode, Instrument Mode, Fault Data Mode and Control Mode.

When the relay leaves the factory all data storage areas are cleared and the settings set to default as specified in

settings document.

When the relay is first energised the user is presented with the following message: -

Duobias 7SR242

_______________________________

ENTER to CONTROL

Figure 1-4 Relay Identifier Screen

On the factory default setup the relay LCD should display the relay identifier, on each subsequent power-on the

screen that was showing prior to the last pow er-off will be displayed.

The push-buttons on the fascia are used to display and edit the relay settings via the LCD, to display and activate

the control segment of the relay, to display the relays instrumentation and Fault data and to reset the output

relays and LED’s.

The five push-buttons have the following functions:

READ DOWN READ UP

These pushbuttons are used to navigate the menu structure and to adjust settings.

ENTER

The ENTER push-button is used to initiate and accept setting changes.

When a setting is displayed pressing the ENTER key will enter the edit mode, the setting will flash and can now

be changed using the▲ or ▼ buttons. When the required value is displayed the ENTER button is pressed again

to accept the change.

When an instrument is displayed pressing ENTER will toggle the instruments favourite screen status.

CANCEL

This push-button is used to return the relay display to its initial status or one level up in the menu structure.

Pressed repeatedly will return to the Relay Identifier screen. It is also used to reject any alterations to a setting

while in the edit mode.

TEST/

RESET

This push-button is used to reset the fault indication on the fascia. When on the Relay Identifier screen it also

acts as a lamp test button, when pressed all LEDs will momentarily light up to indicate their correct operation. It is

also moves the cursor right ► when navigating through menus and settings.

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

SETTINGS DISPLAY MODE INSTRUMENTS MODE FAULT DATA MODE

SYSTEM CONFIGURATION

FUNCTION CONFIG

CT/VT CONFIGURATION

PHASE U/O VOLTAGE

U/O FREQUENCY

VOLTAGE PROTECTION

SUPERVISION

27/59-1

27/59-2

27/59-3

27/59-4

NEUTRAL OVERVOLTAGE 59NIT

59NDT

81-1

81-2

CB FAIL

TRIP CCT SUPERVISION

51-1

51-2

50-1

50-2

51N-1

51N-2

50N-1

50N-2

DERIVED E/F

MEASURED E/F 51G-1

51G-2

50G-1

50G-2

46IT

46DT

37-1

37-2

RESTRICTED E/F

NPS OVERCURRENT

UNDER CURRENT

THERMAL

CONTROL & LOGIC CB CONTROL

INPUT CONFIGURATION

OUTPUT CONFIGURATION

MAINTENANCE

DATA STORAGE

INPUT MATRIX

GENERAL ALARMS

BINARY INPUT CONFIG.

OUTPUT MATRIX

BINARY OUTPUT CONFIG

LED CONFIG

PICKUP CONFIG

CB COUNTERS

I2T CB WEAR

FAVOURITE METERS

CURRENT METERS

VOLTAGE METERS

FREQUENCY METERS

THERMAL METERS

MAINTENANCE METERS

GENERAL ALARM METERS

BINARY INPUT METERS

BINARY OUTPUT METERS

VIRTUAL METERS

MISCELLANEOUS METERS

7SR242 DUOBIAS

__________________________

ENTER to CONTROL

Fault n DD/MM/YY

CURRENT PROTECTION

DIFFERENTIAL PROTECTION

OVERFLUXING 24DT-1

24DT-2

INRUSH DETECTOR

OVERFLUXING DETECTOR

COMMUNICATIONS

64H-1

64H-2

81-3

81-4

81-5

81-6

24IT

OVERFLUXING METERS

COMMUNICATION METERS

DIFFERENTIAL METERS

DEMAND METERS

PHASE OVERCURRENT

CONTROL MODE

CB1

E/F Protection

Set L or R

Set Remote

Set Service

Set Local

CB2

OPEN CIRCUIT

CLOSE CCT SUPERVISION

QUICK LOGIC METERS

QUICK LOGIC

37G-1

37G-2

46BC-1

46BC-2

Figure 1-5 7SR24 Menu Structure

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

1.3 Settings Display

The Settings Mode is reached by pressing the READ DOWN ▼ button from the relay identifier screen.

Once the Settings Mode title screen has been located pressing the READ DOWN ▼ button takes the user into

the Settings mode sub-menus.

Each sub-menu contains the programmable settings of the relay in separate logical groups. The sub menus are

accessed by pressing the TEST/RESET► button. Pressi ng th e ▼ button will scroll throu gh the s etti ngs, after the

last setting in each sub menu is reached the next sub menu will be displayed. If a particular sub menu is not

required to be viewed then pressing ▼ will move directly to the next one in the list.

While a setting is being displayed on the screen the ENTER button can be pressed to edit the setting value. If the

relay is setting password protected the user will be asked to enter the password. If an incorrect password is

entered editing will not be permitted. All screens can be viewed even if the password is not known.

While a setting is being edited flashing characters indicate the edit field. Pressing the ▲ or ▼ buttons will

display the valid field values. If these buttons are held on, the rate of scrolling will increase.

Once editing is complete pressing the ENTER button stores the new setting into the non-volatile memory. The

setting change is effective immediately unless any protection element is operating, in which case the change

becomes effective when no elements are operating.

Configuration and inspection of communications protocol data objects, text used for display in international

languages, graphical user logic and programming of user specific custom protection characteristics is not

possible from the fascia and pc based tools must be used if required.

The actual setting ranges and default values for each relay model can be found in the appendix to this section of

the manual.

1.4 Instruments Mode

The Instrument Mode sub-menu displays key quantities and information to aid with commissioning. The following

meters are available and are navigated around by using the ▲,▼and TEST/REST buttons.

Instrument

Description

FAVOURITE METERS

→to view

This allows the user to view his previously constructed list of

‘favourite meters’ by pressing TEST/RESET ► button and

the READ DOWN button to scroll though the meters added

to this sub-group

To construct a sub-group of favourite meters, first go to the

desired meter then press ENTER this will cause a message

to appear on the LCD ‘Add To Favourites YES pressing

ENTER again will add this to the FAVOURITE METERS

Sub-menu. To remove a meter from the FAVOURITE

METERS sub-menu go to that meter each in the

FAVOURITE METERS sub-menu or at its Primary location

press ENTER and the message ‘Remove From Favourites’

will appear press ENTER again and this meter will be

removed from the FAVO U RIT E M ETE RS sub-group.

The relay will poll through, displaying each of the meters

se lected in favourite meters, after no key presses have been

detected for a user settable period of time. The time is set in

the Setting menu>System Config>Favourite Meters Timer.

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

DIFFERENTIAL METERS

→to view

This is the sub-group that includes all the meters that are

associated with Current TEST/RESET ► allows access to

this sub -group

W1 Line

Ia 0.00xIn ----o

Ib 0.00xIn ----o

Ic 0.00xIn ----o

Displays Windin g 1 Input 3 Phase currents Nominal RMS

values & phase angles with respect to PPS voltage.

W2 Line

Ia 0.00xIn ----o

Ib 0.00xIn ----o

Ic 0.00xIn ----o

Displays Winding 2 Input 3 Phase currents Nominal RMS

values & phase angles with respect to PPS voltage.

W1 Relay

Ia 0.00xIn ----o

Ib 0.00xIn ----o

Ic 0.00xIn ----o

Displays Winding 1 relay currents Nominal RMS values &

phase angles with respect to PPS voltage.

W2 Relay

Ia 0.00xIn ----o

Ib 0.00xIn ----o

Ic 0.00xIn ----o

Displays Winding 2 relay currents Nominal RMS values &

phase angles with respect to PPS voltage.

Operate

Ia 0.00xIn

Ib 0.00xIn

Ic 0.00xIn

Displays the 3 phase operate currents’ relevant to the bia sed

differential (87BD) and highset differential (87HS) functions.

Restrain

Ia 0.00xIn

Ib 0.00xIn

Ic 0.00xIn

Displays the 3 phase restrain currents relevant to the biased

differential (87BD) function.

W1 1st Harmonic

Ia 0.00xIn

Ib 0.00xIn

Ic 0.00xIn

Displays W1 3 phase fundamental current components

Nominal RMS values.

W1 2nd Harmonic

Ia 0.00xIn

Ib 0.00xIn

Ic 0.00xIn

Displays W1 3 phase 2nd Harmonic current comp one nt s

Nominal RMS values.

W1 5nd Harmonic

Ia 0.00xIn

Ib 0.00xIn

Ic 0.00xIn

Displays W1 3 phase 5th Harmonic current components

Nominal RMS values.

W2 1st Harmonic

See above.

W2 2nd Harmonic

See above.

W2 5th Harmonic

See above.

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

CURRENT METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Current TEST/RESET ► allows access to

this sub -group

W1 Primary

Ia 0.00kA

Ib 0.00kA

Ic 0.00kA

Displays the 3 phase currents Primary RMS values

W1 Secondary

Ia 0.00A

Ib 0.00A

Ic 0.00A

Displays the 3 phase currents Secondary RMS values

W1 Nominal

Ia 0.00xIn ----o

Ib 0.00xIn ----o

Ic 0.00xIn ----o

Displays the 3 Phase currents Nominal RMS values & phase

angles with respect to PPS voltage.

W1 Sequence

Izps 0.00xIn ----o

Ipps 0.00xIn ----o

Inps 0.00xIn ----o

Displays the 3 Phase currents Nominal RMS values & phase

angles with respect to PPS voltage.

W1 Derived Earth (In)

Ia kA

Ib A

Ic xIn

Displays the Earth currents derived from W1 line currents.

RMS values.

W2 Primary

See above.

W2 Secondary

See above.

W2 Nominal

See above.

W2 Sequence

See above.

W2 Derived Earth (In)

See above.

Measured Earth – 1 (Ig)

Ig 0.000kA

Ig 0.000A

Ig 0.000xIn

Displays the Earth currents for IG1. RMS values

Measured Earth – 2 (Ig)

Ig 0.000kA

Ig 0.000A

Ig 0.000xIn

Displays the Earth currents for IG2. RMS values

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

VOLTAGE METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Voltage TEST/RESET ► allows access to

this sub -group

Voltage Meters

Pri (Ph-Ph) 0.00kV

Sec 0.00V

Nom 0.00xVn

Displays the Voltage RMS values

FREQUENCY METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Frequency TEST/RESET ► allows access

to this sub-group

Frequency 00.000Hz

Displays the power system frequency.

OVERFLUXING METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Over-fluxing. TEST/RESET ► allows access

to this sub-group

Overfluxing Meters

V/f V xVn

V/f xVn/fn

V/f 24IT %

Displays the over-fluxing values

THERMAL METERS

→to view

This is the sub-group that incl u des all the mete r s that are

associated with Thermal TEST/RESET ► allows access to

this sub -group

Thermal Status

Phase A 0.0%

Phase B 0.0%

Phase C 0.0%

Displays the thermal capacity

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

Meas

Earth

1

W1

5

th

Harm

V

Nom.

V

Secy F

V

Prim

7SR242n-2aAnn-0CA0

W1

2

nd

Harm

ICT

W1

Ia

Line

W1

Ia

prim

W1

Ia

Nom.

W1

1

st

Harm

W1

Ia

secy

W1

I EF

Der.

W1

I

Seq.

Ia

Op.

Ib

Op.

Ic

Op.

W1

Rel.

Ia

W1

Rel.

Ib

W1

Rel.

Ic

W2

Rel.

Ia

W2

Rel.

Ib

W2

Rel.

Ic

W1

5

th

Harm

W1

2

nd

Harm

W1

Ib

Line

W1

Ib

prim

W1

Ib

Nom.

W1

1

st

Harm

W1

Ib

secy

W1

5

th

Harm

W1

2

nd

Harm

W1

Ic

Line

W1

Ic

prim

W1

Ic

Nom.

W1

1

st

Harm

W1

Ic

secy

Meas

Earth

2

W2

I EF

Der.

W2

I

Seq.

W2

5

th

Harm

W2

2

nd

Harm

W2

Ic

Line

W2

Ic

prim

W2

Ic

Nom.

W2

1

st

Harm

W2

Ic

secy

W2

5

th

Harm

W2

2

nd

Harm

W2

Ib

Line

W2

Ib

prim

W2

Ib

Nom.

W2

1

st

Harm

W2

Ib

secy

W2

5

th

Harm

W2

2

nd

Harm

W2

Ia

Line

W2

Ia

prim

W2

Ia

Nom.

W2

1

st

Harm

W2

Ia

secy

V/F

W1

Therm

W1

Therm

W1

Therm

W2

Therm

W2

Therm

W2

Therm

Ib

Rest.

Ia

Rest.

Ic

Rest.

Figure 1-6 Schematic Diagram: Current and Voltage Meters (includes optional functionality)

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

MAINTENANCE METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Maintenance TEST/RESET ► allows

access to this sub-group

CB1 Manual Close

Last Close ms

CB1 Manual Open

Last Open ms

Displays the CB manual opening and closing times

CB2 Manual Close

Last Close ms

CB2 Manual Open

Last Open ms

Displays the CB opening and closing times

CB1 Total Trips

Count 0

Target 100

Displays the number of CB trips experienced by the CB

CB1 Delta Trips

Count 0

Target 100

Displays the number of CB trips experienced by the CB

CB2 Total Trips

Count 0

Target 100

Displays the number of CB trips experienced by the CB

CB2 Delta Trips

Count 0

Target 100

Displays the number of CB trips experienced by the CB

CB1 Wear

Phase A 0.00MA^2s

Phase B 0.00MA^2s

Phase C 0.00MA^2s

Displays the current measure of circuit breaker wear.

CB2 Wear

Phase A 0.00MA^2s

Phase B 0.00MA^2s

Phase C 0.00MA^2s

Displays the current measure of circuit breaker wear.

CB1 Trip Time

Trip Ti me ms

CB2 Trip Time

Trip Ti me ms

Displays the CB manual opening and closing times

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

GENERAL ALARM METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with the Binary inputs TEST/RESET ► allows

access to this sub-group

General Alarms

ALARM 1 Cleared

Displays the state of General Alarm

General Alarms

ALARM 2 Cleared

General Alarms

ALARM 3 Cleared

General Alarms

ALARM 4 Cleared

General Alarms

ALARM 5 Cleared

General Alarms

ALARM 6 Cleared

General Alarms

ALARM 7 Cleared

General Alarms

ALARM 8 Cleared

General Alarms

ALARM 9 Cleared

General Alarms

ALARM 10 Cleared

General Alarms

ALARM 11 Cleared

General Alarms

ALARM 12 Cleared

DEMAND METERS

→to view

This is the sub-group that includes Demand meters. Values

are available for user defined time periods. TEST/RESET ►

allows access to this sub-group

Voltage Demand

Displays maximum, minimum and mean value s

W1 I Phase A Demand

W1 I Phase B Demand

W1 I Phase C Demand

W2 I Phase A Demand

W2 I Phase B Demand

W2 I Phase C Demand

Frequency Demand

BINARY INPUT METERS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with the Binary inputs TEST/RESET ► allows

access to this sub-group

BI 1-8 ---- ----

BI 9-13 ---- -

Displays the state of DC binary inputs 1 to 8 (The number of

binary inputs may vary depending on model)

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

BINARY OUTPUT MET E RS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with the Binary Outputs TEST/RESET ► allows

access to this sub-group

BO 1-8 ---- ----

BO 9-14 ---- -- Displays the state of DC binary Outputs 1 to 8. (The number

of binary outputs may vary depending on model)

VIRTUAL METERS

→to view

This is the sub-group that shows the state of the virtual status inputs in

the relay TEST/RESET ► allows access to this sub-group

V 1-8 ---- ----

V 9-16 ---- ----

Displays the state of Virtual Outputs 1 to 16 (The number of virtual

inputs will vary depending on model)

COMMUNICATION METE RS

→to view

This is the sub-group that incl u des all the mete rs that ar e

associated with Communications ports TEST/RESET ►

allows access to this sub-group

COM1

COM2

COM3

COM4

Displays which com ports are currently active

COM1 TRAFFIC

Tx1 0

Rx1 0

Rx1 Errors 0

Displays traffic on Com1

COM2 TRAFFIC

Tx2 0

Rx2 0

Rx2 Errors 0

Displays traffic on Com2

COM3 TRAFFIC

Tx3 0

Rx3 0

Rx3 Errors 0

Displays traffic on Com3

COM4 TRAFFIC

Tx4 0

Rx4 0

Rx4 Errors 0

Displays traffic on Com4

MISCELLANEOUS METERS

→to view

This is the sub-group that includes indication such as the

relays time and date, the amount of fault and waveform

records stored in the relay TEST/RESET ► allows access to

this sub -group

Date DD/MM/YYYY

Time HH:MM:SS

Waveform Recs 0

Fault Recs 0

This meter displays the date and time and the number of

Fault records and Event records stored in the relay.

The records stored in the relay can be cleared using the

options in the Settings Menu>Data Storage function.

Event Recs 0

Data Log Recs 0

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

QUICK LOGIC METERS

→to view

E 1-8

E 9-16

E1 Equation 0

EQN = 0

TMR 0-0 = 0

CNT 0-1 = 0

En Equation

1.5 Fault Data Mode

The Fault Data Mode sub menu lists the time and date of the previous ten protection operations. The stored data

about each fault can be viewed by pressing the TEST/RESET► button. Each record contains data on the

operated elements, analogue values and LED flag states at the time of the fault. The data is viewed by scrolling

down using the ▼ button.

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

Section 2: Set ting the Relay Using Reydisp

Reydisp Evolution software provides a pc tool which can be used for programming of protection configuration and

settings and the mapping of hardware input and outputs using a graphical interface. It is supplied with additional

tools for configuration of serial communication protocol data objects, configuration of text for international

language support and programming of user specific time current curves. To configure the relay using a serial

communication port the user will need the following:-

PC with Reydisp Evolution Installed. (This can be download from our website www.siemens.com/energy and

found under the subm enu ‘Sof t w ar e’).

Configuration and download of IEC 61850 data and programming of graphical user logic requires the use of the

Reydisp Manager software which is supplied with online instructions and help and is not documented here.

2.1 Physical Conne ction

The relay can be connected to Reydisp via any of the communication ports on the relay. Suitable communication

Interface cable and converters are required depending which port is being used.

2.1.1 Front USB connection

To connect your pc locally via the front USB port.

Local

Engineer

Access

USB Type A

USB Data Cable

USB Type A

socket on PC

USB Type B

Figure 2-1 USB connection to PC

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

2.1.2 Rear RS485 connection

Laptop computer

USB or 9 pin male

D connector

25 pin male D

connector

14

18

RS485 Screened

twisted pair Rear terminals

RS232 straight

through cable or

RS232 to USB

converter cable

Figure 2-2 RS485 connection to PC

2.1.3 Optional rear fibre optic connection

7SG244

Tx

Rx Tx

Rx

USB or 9 pin male

D connector

25 pin male D

connector

62.5/125µm fibre optic with ST

connectors

Laptop computer RS232 straight

through cable or

RS232 to USB

converter cable

Figure 2-3 Fibre Optic Connection to PC

Sigma devices have a 25 pin female D connector with the following pin out.

Function

2

Transmit Data

3

Received Data

4

Request to Send

5

Clear to Send

6

Data set ready

7

Signal Ground

8

Received Line Signal Detector

20

Data Terminal Ready

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

2.1.4 Optional rear RS485 + IRIG-B connection

Laptop computer

USB or 9 pin male

D connector

25 pin male D

connector

B

A

RS485 Screened

twisted pair Rear Connector

RS232 straight

through cable or

RS232 to USB

converter cable

IRIG-B

COM 3

Gnd

Term

Figure 2.1-1 Additio nal (Op ti onal ) rear RS485 + IRIG-B connection to a PC

2.1.5 Optional rear RS232 + IRIG-B connection

Laptop computer

USB or 9 pin male

D connector

9 way D connector

RS232 cross-over

cable or RS232 to

USB converter

cable

IRIG-B

COM 3

Figure 2.1-2 Additio nal (Op ti onal ) rear RS232 + IRIG-B connection to a PC

Relay Function

1

Not Connected

2

Receive Data (RXD)

3

Transmit Data (TXD)

4

Outut Supply +5 V 50mA

5

Signal Ground (GND)

6

Input Supply +5 V 50mA

7

Linked to 8 (volts free)

8

Linked to 7 (volts free)

9

Output Supply +5V 50mA

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

2.1.6 Optional Rear EN100 Ethernet Module (COM3)

The optional ethernet interface is primarily provided for support of IEC 61850 protocol. Support for IEC 870-5-103

is also provided over this interface to allow connection with Reydisp Evolution and Reydisp Manager software for

interrogation, editing and download of relay settings and other data. Ordering options are available with two R J45

electrical connectors or with two duplex LC fibre optic connectors.

Setting name Range Default Setting Notes

LAN Protocol OFF, IEC60870-5-103 IEC60870-5-103

If this setting is set to Off, access to relay data using Reydisp Evolution and Reydisp Manager software via the

Ethernet interface is not available.

Connections to the optional EN100 ethernet module are made on the rear underside of the relay.

Connections are made to either RJ45 sockets (electrical) or Duplex LC (fibre optic) connectors.

LED yellow

LED green

LED yellow

LED green

Ch 1Ch 2

Ethernet – EN100-E

EN100 Module – RJ45 Interface

Ethernet – EN100-O

Ch 1 Ch 2

EN100 Module – Duplex-LC Interface

Green LED (Physical Link)

Off – No link

On – Link present

Yellow LED (Activity)

Off – No traffic

On/flashing - Traffic

Figure 2-4 EN100 Ethernet Module

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

2.1.7 Configuring Relay Data Communication

Using the keys on the relay fascia scroll down the settings menu’s into the ‘communications’ menu. All of the

below settings may not be available in all relay types. Reydisp software is compatible with IEC60870-5-103

protocol.

COM1-RS485 Port

COM2-USB Port (Front)

COM3 – Optional Fibre Optic, RS485, RS232 or Ethernet Port

COM4 – Optional Fibre Optic Port

LAN – Optional Ethernet Ports

Setting name Range Default Units Notes

Station Address 0 … 65534 0

Address given to relay to

identify that relay from

others which may be using

the same path for

communication as other

relays for example in a fibre

optic hub

COM1-RS485 Protocol OFF, IEC60870-5-103,

MODBUS-RTU, DNP3 IEC60870-5-

103

COM1: Rear mounted

RS485 port

COM1-RS485 Mode Loca l,Rem ot e, Local or

Remote Remote

COM1-RS485 Baud

Rate

75 110 150 300 600 1200

2400 4800 9600 19200

38400 19200

COM1-RS485 Parity

NONE, ODD, EVEN EVEN

COM2-USB Protoc ol OFF, IEC60870-5-103,

MODBUS-RTU, ASCII,

DNP3

IEC60870-5-

103 COM2: Front USB port.

COM2-USB Mode Local,Remote, Local or

Remote Remote

COM3 Protocol OFF, IEC60870-5-103,

MODBUS-RTU, DNP3 IEC6-0870-5-

103

COM3: Optional rear

mounted connec tion

COM3 Baud Rate 75 110 150 300 600 1200

2400 4800 9600 19200

38400 57600 115200 19200

COM3 Parity

NONE, ODD, EVEN EVEN

COM3 Line Idle*

LIGHT ON, LI GHT OFF LIGHT OFF

COM3 Data echo*

ON, OFF OFF

COM4 Protocol** OFF, IEC60870-5-103,

MODBUS-RTU, DNP3 OFF

COM4: Optional rear

mounted Fibre Optic ST

connection

COM4 Baud Rate** 75 110 150 300 600 1200

2400 4800 9600 19200

38400 19200

COM4 Parity**

NONE, ODD, EVEN EVEN

COM4 Line Idle** LIGHT ON, LIGHT OFF LIGHT OFF

COM4 Data echo**

ON, OFF OFF

DNP3 Unsolicited

Events ENABLED, DISABLED DISABLED Setting is only visible when

a port protocol is set to

DNP3.

Chapter 2) 7SR242 Duobias Settings, Configuration & Instruments Guide

Setting name Range Default Units Notes

DNP3 Destination

Address 0 … 65534 0 Setting is only visible when

a port protocol is set to

DNP3.

DNP3 Application

Timeout 5, 6 ... 299, 300 10s Seconds Setting is only visible when

a port Protocol is set to

DNP3

*Not applicable for RS485 or RS232 interface modules.

**Fibre Optic Module only

2.1.8 Connecting to the Relay via Reydisp

When Reydisp soft w ar e is running all av aila ble communication ports of the PC will automatically be detected.

On the start page tool bar open up the sub-menu File > Connect.

The ‘Communication Manager’ window will display all available communication ports. With the preferred port

highlighted, select the ‘Properties’ option and ensure the baud rate and parity match that selected in the relay

Data Comms settings. Select ‘Conne ct’ to initiate the relay-PC connection.

Figure 2-5 PC Comm s Port Allocation

Via the Relay > Set Address > Address set the relay address (1-254) or alternatively search for connected

devices using the Relay > Set Address > Device Map. The relay can now be configured using the Reydisp

software. Please refer to the Reydisp Evolution Manual for further guidance.

Chapter 3) 7SR242 Duobias Performance Specification