Product Specification

03250

ESDR 4T Current

Differential Relay

APPLICATIONS

The ESDR 4T unit offers three-phase current differential protection for generators, motors and transformers in unit connection.

Current transformers at both sides of the protection object(s) measure the individual conductor currents.

Any two-phases of three-phase short circuits and earth leakages are recognized by the ESDR 4T as fault currents.

The ESDR 4T affords design simplification of the switchgear cabinet, facilitates the commissioning, ensures the operation of the system is user friendly and increases the availability of the system.

DESCRIPTION

ESDR 4T functions & features include: 6 x I measurement, 3-phase

system at both sides of the protected zone

Microprocessor based design. Transformer ratio of the measuring

CT for every primary value separately adjustable.

Adjustable transformer ratio of the transformer

Minimal command time: 40 ms Selectable transformer vector

group. 4 programmable relays outputs 4 metallically separated discrete

inputs for blocking and remote acknowledgement.

An internal test routine monitors cyclically the readiness for operation

5 mm LCD display (green illuminated)

ESDR 4T

Protective Functions ANSI #

Generator current differential 87G Block current differential 87GT Motor current differential 87M Restraint current protection

10 bit measuring

3-phase Current differential protection

Configurable transformer ratio for transformer

Configurable CT ratio for measuring transformer

Selectable vector group for transformer phase shift

Digital input for blocking or remote acknowledgement

Discrete Out permissive

PC configurable and Front panel configurable

Microprocessor technology for accurate, repeatable and reliable operation

Programmable relay outputs

Example: Generator / transformer Block protection

Monitoring

Differential CurrentProtection

ON

Alarm

IsIa Ib+

2=

Ia IbId =

ProtectedObject

Ia Ib

[ ]

Operating and Alarm Messages

L1 L2 L3

Release

Variable Release Characteristic

X

Y

10%

IdNI

IsNI

Lock

Is

Id

GCB

G

ESDR 4 Block Protection

PART NUMBERS AND OPTION PACKAGES

ESDR 4T 5448-897

TRIPPING CHARACTERISTIC

Monitoring step 1(X12 = 100 % / Y1 = 10 %)

Monitoring step 2(X12 = 100 % / Y2 = 35 %)

Protectedobject

100 200

Characteristic gradient = 10 %

Monitoring step 2, fixed limit (100 %)

X12, Y2 and Y1: adjustable

NI

100

P (X12/Y2)

P (X12/Y1)

Y =Id [%]

aI

300 400

2000-12-08ESDR 4T Auslsekennlinie e4tleo-5000-kenn.skf

500

S

I[%]I

N

X =

-+ IbaIb

I =I

S II=I bad2

Monitoring step 1fixed limit(85 %-Y2+Y1)

Monitoring step 2fixed limit (85 %)

1

21 2=

35

10

DIMENSIONS

27

1

34

35

36

63

28

29

30

31

32

33

42

50

65.0

55.8

4.0

4.6

46.5

4.0

14

3.

0

50.0

Leonhard - ReglerbauStuttgart

24

variable release characteristic

Section A

operation and error messages

I

25

26

37

38

39

40

41

Y

N

d

I

X

10 %release

lock

Id

ISL1

bad

4.0

IN

IS

error

ONmonitoring

select digit

message display

4.0

cursor

clear

differential currentprotection

protectedobject

I=I

L2

Ia=IS

Ia

[ ]L3ESDR 4

I-

+2

bI

bI

180.0

132.0A

8.0

14

4.

0

110.045.0

16.5

A Mounting clamp

Snapp track mounting

72.0

SPECIFICATIONS

Measuring current .............................. /1 A or../5 A Measuring frequency.............................. 4070 Hz Power supply................................. 24 Vdc (25 %) Power consumption ................................ max. 6 W Ambient temperature ............................ -2070 C Ambient humidity................. 95%, non-condensing

Measuring input current.. consumption < 0.15 VA Current-carrying capacity...................... 5.0 IN Rated short-time current (1 s)100.0 IN (for 1 s) ........................................ 30.0 IN (for 10 s) Accuracy ............................... maximal 1 % IN Reference voltage............................... 0.15 % Max. temperature deviation .............. 12 ppm/K

Digital inputs ..................... metallically separated Insulation voltage ............................... 2200 Veff Input range......................... 18250 V (dc or ac) Input resistance....................................... 68 kW

Potential free outputs .... contact material: AgCdO Electrical life cycle (ohmic load) .................................

................. min. 100.000 cycles at 2 A / 250 Vac

Load................. max. 2 A at 250 Vac or 24 Vdc Max. switching voltage ........................ 250 Vac Insulation voltage................................ 2200 Veff Switching capacity DC............................. 45 W

Protection functions............................................................................ minimum command time 40 ms

Housing ................ type APRANORM DIN 43 700 Dimensions (snap-on rail) . 144 72 199 mm Dimensions (front) ............. 144 72 162 mm Front cutout ...................................138 67 mm Connection ............ screw terminals depending ......... on plug connector 2,5 mm or 4 mm

Front foil .................................... insulated surface

Protection system .................... IP 21, front IP 54 Weight ......... depending on model, ca. 1,000 g

Disturbance test ......................................... (CE)........ tested according to applicable EN guidelines

Woodward Industrial Controls PO Box 1519 Fort Collins CO, USA

80522-1519 1000 East Drake Road Fort Collins CO 80525 Ph: +1 (970) 482-5811 Fax: +1 (970) 498-3058 Distributors & Service Woodward has an international network of distributors and service facilities. For your nearest representative, call the Fort Collins plant or see the Worldwide Directory on our website. Corporate Headquarters Rockford IL, USA Ph: +1 (815) 877-7441 www.woodward.com This document is distributed for informational purposes only. It is not to be construed as creating or becoming part of any Woodward Governor Company contractual or warranty obligation unless expressly stated in a written sales contract. Woodward Governor Company, 2001 All Rights Reserved

TYPICAL APPLICATIONS

off52

ESDR 4T

G

I / O

87GT

87G

ESDR 4T

For more information contact: 01/08/F