Woodward ESDR 4T, Manual

Manual 37138C 

ESDR 4T - Current Differential Protection Relay 

© Woodward 

Page 3/46 

Revision History 

Rev. Date 

Editor Changes 

NEW 02-11-26  Tr 

Release 

A 03-02-29 

TP Minor 

corrections 

B 04-11-22 

TP Minor 

corrections 

C 07-03-01 

TP Sealing 

parameters added; minor corrections 

Contents 

C

HAPTER 

1. G

ENERAL 

I

NFORMATION

..........................................................................................5

C

HAPTER 

2. E

LECTROSTATIC 

D

ISCHARGE 

A

WARENESS

..............................................................7

C

HAPTER 

3. W

IRING

..................................................................................................................8

Wiring Diagram .......................................................................................................................................9

Power Supply ........................................................................................................................................10

Measuring Inputs...................................................................................................................................11

Discrete Inputs ......................................................................................................................................12

Relay Outputs .......................................................................................................................................13

C

HAPTER 

4. F

UNCTIONAL 

D

ESCRIPTION

...................................................................................14

Introduction ...........................................................................................................................................14

Measurement Inputs .............................................................................................................................15

Differential Current Monitoring ..............................................................................................................16

Tripping Characteristic................................................................................................................16

Electrical Restraint of Inrush Current and Overexcitation with Transformers ............................18

Self-Monitoring ......................................................................................................................................18

Configuration.........................................................................................................................................18

Inputs and Outputs................................................................................................................................19

Control Inputs..............................................................................................................................19

Relays .........................................................................................................................................19

C

HAPTER 

5. D

ISPLAY AND 

O

PERATING 

E

LEMENTS

....................................................................20

Short Description of LEDs and Buttons ................................................................................................20

LEDs......................................................................................................................................................21

Buttons ..................................................................................................................................................21

LC-Display.............................................................................................................................................22

C

HAPTER 

6. C

ONFIGURATION

...................................................................................................24

Introduction ...........................................................................................................................................24

Basic Data.............................................................................................................................................24

Configuration Access ............................................................................................................................25

Configuring the Relay............................................................................................................................27

Nominal Data ........................................................................................................................................29

General Data...............................................................................................................................29

Data for Differential Protection....................................................................................................29

Differential Protection............................................................................................................................30

Modifying the Tripping Characteristic .........................................................................................31

Modifying the Electrical Restraint ...............................................................................................32