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DIAC / DIFC / DSFCDIGITAL OVERCURRENT PROTECTION

Instruction Manual

Manual P/N: GEK-105570C

Copyright © 2001 GE Power Management

GE Power Management

215 Anderson Avenue, Markham, Ontario

Canada L6E 1B3

Tel: (905) 294-6222 Fax: (905) 294-8512

Internet: http://www.GEindustrial.com/pmManufactured under an

ISO9002 Registered system.

gGE Power Management

Note: All relays must be powered up at least once per year toavoid deterioration of electrolytic capacitors and subsequentrelay failure.

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DIAC / DIFC / DSFC Digital Overcurrent Protection 1

TABLE OF CONTENTS

INTRODUCTION........................................................................................................................ 3

PRODUCT DESCRIPTION ........................................................................................................ 4

GENERAL....................................................................................................................................................4APPLICATION...............................................................................................................................................4FUNCTIONS .................................................................................................................................................4

CALCULATION OF SETTINGS ............................................................................................... 23

HARDWARE DESCRIPTION................................................................................................... 24

CASE........................................................................................................................................................24ADJUSTMENTS ..........................................................................................................................................24TARGETS AND INDICATORS........................................................................................................................24RESET AND MANUAL TRIP .........................................................................................................................25TRIP CIRCUIT TEST ...................................................................................................................................25TRIP CIRCUIT ............................................................................................................................................25COVER INSTALLATION DIAC AND DSFC.....................................................................................................25RECEIVING, HANDLING AND STORAGE .......................................................................................................25

INSTALLATION ................................................................................................................... .... 26

ENVIRONMENT ..........................................................................................................................................26MOUNTING................................................................................................................................................26SURGE GROUND (DIAC AND DSFC)..........................................................................................................26SURGE GROUND AND RFI IMMUNITY (DIFC ONLY)......................................................................................26

ACCEPTANCE TESTS ............................................................................................................ 33

VISUAL INSPECTION...................................................................................................................................33MECHANICAL INSPECTION..........................................................................................................................33ELECTRICAL TESTS ...................................................................................................................................33

PERIODIC TESTS AND SERVICING ...................................................................................... 39

PERIODIC TESTS .......................................................................................................................................39SERVICING................................................................................................................................................39

SPECIFICATIONS ................................................................................................................... 41

BURDENS..................................................................................................................................................41RATINGS...................................................................................................................................................42BURDENS..................................................................................................................................................42CONTACT RATINGS ...................................................................................................................................42ENVIRONMENTAL.......................................................................................................................................42INSULATION WITHSTAND TESTS .................................................................................................................42SURGE WITHSTAND CAPABILITY ................................................................................................................42RADIO FREQUENCY WITHSTAND ................................................................................................................42ELECTROSTATIC DISCHARGE .....................................................................................................................42

APPLICATION NOTES............................................................................................................ 43

IOC/TOC UNIT .........................................................................................................................................43

Cover Photo: 8919670

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2 DIAC / DIFC / DSFC Digital Overcurrent Protection

LIST OF FIGURES

FIGURE 0: FRONT VIEW DIFC (8919654)................................................................................................................... 3

FIGURE 1: IAC51 TOC CURVE...................................................................................................... .............................. 6

FIGURE 2: IAC53 TOC CURVES ..................................................................................................... ............................ 7

FIGURE 3: 55 SHORT TIME TOC CURVES ................................................................................................................ 8

FIGURE 4: 57 MEDIUM TIME TOC CURVES .............................................................................................................. 9

FIGURE 5: 66 LONG TIME TOC CURVES .............................................................................................. .................. 10

FIGURE 6: 75 SHORT TIME TOC CURVES .............................................................................................................. 11

FIGURE 7: IAC77 TOC CURVES ..................................................................................................... .......................... 12

FIGURE 8: 95 SHORT TIME TOC CURVES .............................................................................................................. 13

FIGURE 9: IEC INVERSE TOC CURVES................................................................................................................... 14

FIGURE 10: IEC VERY INVERSE TOC CURVES...................................................................................................... 15

FIGURE 11: IEC EXTREMELY INVERSE TOC CURVES.................................................................................... ...... 16

FIGURE 12: IEEE INVERSE TOC CURVES .............................................................................................................. 17

FIGURE 13: IEEE VERY INVERSE TOC CURVES.................................................................................................... 18

FIGURE 14: IEEE EXTREMELY INVERSE TOC CURVES................................................................................... ..... 19

FIGURE 15: DEFINITE TIME...................................................................................................................................... 20

FIGURE 16: I2T TIME CURVE .................................................................................................................................... 21

FIGURE 17: IOC CURVE............................................................................................................................................ 22

FIGURE 18: DIAC AND DSFC EXTERNAL / INTERNAL CONNECTIONS............................................................... 27

FIGURE 19: DIFC EXTERNAL / INTERNAL CONNECTIONS................................................................................ ... 28

FIGURE 20: DIAC PANEL MOUNTING AND DRILLING.................................................................................... ....... 29

FIGURE 21: DIFC PANEL MOUNTING AND DRILLING .................................................................................... ....... 30

FIGURE 22: SURFACE MOUNTING DIFC............................................................................................... .................. 31

FIGURE 23: DSFC PANEL MOUNTING AND DRILLING.................................................................................... ...... 32

FIGURE 25: DIAC OR DSFC TEST SETUP FOR PICKUP AND OPERATING TIME VERIFICATION ..................... 37

FIGURE 26: DIFC TEST SETUP FOR INSTANTANEOUS UNIT.............................................................................. . 37

FIGURE 27: DIAC OR DSFC TEST SETUP FOR INSTANTANEOUS....................................................................... 38

FIGURE 28 (9819647/8919648): DIAC FRONT AND REAR VIEWS......................................................................... 39

FIGURE 29 (8919652/8919653): DIFC FRONT AND REAR VIEWS ......................................................................... 40

FIGURE 30 (8919632/8919661): DSFC FRONT AND REAR VIEWS........................................................................ 4 0

FIGURE 31: BURDEN CURVE........................................................................................................ ........................... 41

FIGURE 32: IOC/TOC UNIT ....................................................................................................................................... 43

These Instructions do not purport to cover all details or variations in equipmentnor provide for every possible contingency to be met in connection with the in-stallation, operation, or maintenance. Should further information be desired orshould particular problems arise which are not covered sufficiently for the pur-chaser’s purpose, the matter should be referred to the GENERAL ELECTRICCOMPANY. To the extent required the product described herein meets applicableANSI, IEEE, NEMA, and IEC standards; but no assurances are given with respect tolocal codes and ordinances because they vary greatly

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INTRODUCTION

Figure 0: Front View DIFC (8919654)

FEATURES• Digital single Phase overcurrent protection• General-purpose feeder protection• 50 / 51 applications• Self-powered• 16 Selectable curves• Reset curve enable/disable• Low Burden• Fully Retrofitable *• Functional separate TOC and IOC opera-

tions.• Wide settings range.• Drawout case construction

* When replacing unit and case (see instructionmanual INSTALLATION section for details).

51

52

50

Main Bus

To Load

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PRODUCT DESCRIPTIONGeneral

The DIAC, DIFC and DSFC are a family of self-powered, single-phase, digital overcurrent relays.The DIAC is packaged in a GE S1 style case, theDIFC is packaged in a GE C1 style case and theDSFC is packaged in a GE V1 style case. See theHARDWARE DESCRIPTION section for mountingdimensions.

The table below gives the model number break-down.

D_ _CA _ _

B Revision

1 1 Amp Nominal Current

5 5 Amp Nominal Current

IF C1 case

IA S1 case

SF V1 case

These relays use waveform sampling of the currentinput together with appropriate algorithms to pro-vide a time overcurrent (TOC) and an instantane-ous overcurrent (IOC) function.

Application

Time and instantaneous overcurrent functions arewidely used in many applications throughout thepower system. Typical examples are protection ofutility and industrial feeders and short circuit andoverload protection for transformers, and motors.

For feeder protection, the usual application re-quires one relay per phase and a fourth relay con-nected in the residual circuit of three ‘wye’ con-nected current transformers (CTs). A typical exter-nal connection diagram for this application isshown in Figure 18 OR 19. Use of a separateground relay provides more sensitive protection forground faults.

The TOC reset characteristics can be set to emu-late those of an induction disk or set for fast resetwith no intentional delay.

Functions

The TOC function operates on an ‘RMS’ currentcalculated from the sampled values. The IOC func-tion operates on the sampled values, and the algo-rithm virtually eliminates the decaying DC offset

component to achieve low transient overreach ofless than 7%.

The relays contain two independent settings, onefor TOC and one for IOC.

TOC

The TOC function provides 16 selectable time cur-rent curves.

• IAC51

• IAC53

• 55-SHORT TIME

• 57-MEDIUM TIME

• 66-LONG TIME

• 75-SHORT TIME

• IAC77

• 95-SHORT TIME

• IEC Inverse

• IEC Very Inverse

• IEC Extremely Inverse

• IEEE Inverse

• IEEE Very Inverse

• IEEE Extremely Inverse

• Definite Time

• I2T

The IAC51, IAC53 and IAC77 curves match thetime current curve of the respective IAC model.This includes the 0.5 through 9.9 time dial settingand for both the 1 and 5 amp units. Numberedcurves 55, 57, 66, 75, and 95 match the shape ofthe respective IAC model however the time dialpositions are not one to one equivalents. The IEC,IEEE and I2t curves are based on the followingequations:

NOTE:

••••••••••••••••••••••••••••••••••

IEC equations are defined by IEC 255-4 and IEEEequations are defined by IEEE PC37.112

••••••••••••••••••••••••••••••••••

In the following equations,

M = multiple of pickupTD = time dial (0.5, 1, …, 9.9)t = time (seconds)

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IEC Inverse

See Figure 9 for graph of equation

TDM

t

timePickup

TDM

t

timeReset

−=

−

−=

−

1014.0

197.

02.0

2

IEC Very Inverse


TDM

t

timePickup

TDM

t

−=

−

−=

−

135.1

132.4

1

2

timeReset

IEC Extremely Inverse


TDM

t

timePickup

TDM

t

timeReset

−=

−

−=

−

10.8

182.5

2

2

IEEE Inverse


TDM

t

timePickup

TDM

t

timeReset

+

−=

−

−=

−

0228.01

0103.

197.

02.0

2

IEEE Very Inverse


TDM

t

timePickup

TDM

t

timeReset

+

−=

−

−=

−

0982.01

922.3

132.4

2

2

IEEE Extremely Inverse


TDM

t

timePickup

TDM

t

timeReset

+

−=

−

−=

−

02434.01

64.5

182.5

2

2

I2T


TDM

t

timePickup

TDM

t

timeReset

=

−

=

−

2

2

250

2

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.1

2

3

4

5

66

7

1

2

3

4

5

66

7

10

2

3

4

5

66

7

100

DIAC, DIFC, & DSFC OVERCURRENT RELAYS

IAC 51

RESET OPERATE

.5

1

2

3

4

567899.9

Tim

e D

ial S

ettin

gs

Inverse Standard

��Pow er M anagem ent

Frequency: 50/60 Hertz

0.1 - 3.18 (1 Ampere Relays)General Electric CO., 205 Great Valley Parkway, Malvern, PA 19355

0358A1104

Multiples of Pickup Setting

Tim

e in

Se

con

ds

Time Dial Range: (0.5 - 9.9)Current Range: 0.5 - 15.9 ( 5 Ampere Relays)

GES10023

Figure 1: IAC51 TOC Curve

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2


IAC 53

RESET OPERATE

.5

1

2

3

4567

89

Tim

e D

ial S

ettin

gs

9.9

Very Inverse Standard

��Pow er M anagement



0358A1105


Tim

e in

Sec

onds


GES10024

Figure 2: IAC53 TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

4

5

66

7

0.1

2

3

4

5

66

7

1

2

3

4

5

66

7

10


55 - ST

RESET OPERATE

.5

1

2

3

4

567899.9

Tim

e D

ial S

ettin

gs

Short Time




0358A1106


Tim

e in

Se

con

ds


GES10025

Figure 3: 55 Short Time TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.1

2

3

4

5

66

7

1

2

3

4

5

66

7

10

2

3

4

5

66

7

100


57 - MT

RESET OPERATE

Tim

e D

ial S

ettin

gs

.5

1

2

3

4

567899.9

Inverse Medium




0358A1107


Tim

e in

Se

con

ds


GES10026

Figure 4: 57 Medium Time TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.1

2

3

4

55

6

1

2

3

4

55

6

10

2

3

4

55

6

100

2

3

4

55

6

1000


66 - LT

RESET OPERATE

Inverse Long

.5

1

2

3

Tim

e D

ial S

ettin

gs4

567

89

9.9




0358A1108


Tim

e in

Se

con

ds


GES10027

Figure 5: 66 Long Time TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

4

55

6

0.1

2

3

4

55

6

1

2

3

4

55

6

10

2

3

4

55

6

100


75 - ST

RESET OPERATE

Inverse Medium Short

.5

1

2

3

Tim

e D

ial S

ettin

gs4567

89 9.9




0358A1109


Tim

e in

Se

con

ds


GES10028


*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2


IAC 77

RESET OPERATE

Extremely Inverse Standard

.5

1

2

3

45

Tim

e D

ial S

ettin

gs67

9.99

8




0358A1110


Tim

e in

Se

con

ds


GES10029

Figure 7: IAC77 TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

4

55

6

0.1

2

3

4

55

6

1

2

3

4

55

6

10

2

3

4

55

6

100


95 - ST

RESET OPERATE

Inverse Short

.5

1

2

3

45

Tim

e D

ial S

ettin

gs

67

89

9.9

��Pow er M anagement



0358A1111


Tim

e in

Sec

onds


GES10030


*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

4

55

6

0.1

2

3

4

55

6

1

2

3

4

55

6

10

2

3

4

55

6

100


IEC Inverse

RESET OPERATE

Tim

e D

ial S

ettin

gs

3

2

1

.5

4567

89

9.9




0358A1112


Tim

e in

Se

con

ds


GES10031

Figure 9: IEC Inverse TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2


IEC VERY INVERSE

RESET OPERATE

.5

1

2

3

456

9.9

789

Tim

e D

ial S

ettin

gs




0358A1113


Tim

e in

Se

con

ds


GES10032

Figure 10: IEC Very Inverse TOC Curves

*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2


IEC Ext. Inv.

RESET OPERATE

Extremely Inverse

.5

Tim

e D

ial S

ettin

gs

9.99

87654

3

2

1




0358A1114


Tim

e in

Se

con

ds


GES10033

Figure 11: IEC Extremely Inverse TOC Curves

*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

4

55

6

0.1

2

3

4

55

6

1

2

3

4

55

6

10

2

3

4

55

6

100


IEEE Inverse

RESET OPERATE

Tim

e D

ial S

ettin

gs

.5

1

2

3

4567

89

9.9




0358A1115


Tim

e in

Se

con

ds


GES10034

Figure 12: IEEE Inverse TOC Curves

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0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2

DIAC, DIFC, & DSFC

OVERCURRENT RELAYS

IEEE Very Inv.

RESET OPERATE

Tim

e D

ial S

ettin

gs

.5

1

2

3

4567

89

9.9

Very Inverse




0358A1116


Tim

e in

Se

con

ds


GES10035

Figure 13: IEEE Very Inverse TOC Curves

*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.01

2

3

44

56

0.1

2

3

44

56

1

2

3

44

56

10

2

3

44

56

100

2


IEEE Ext. Inv.

RESET OPERATE

Extremely Inverse

.5

1

2

3

Tim

e D

ial S

ettin

gs4567

89 9.9




0358A1117


Tim

e in

Se

con

ds


GES10036

Figure 14: IEEE Extremely Inverse TOC Curves

*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

3

4

55

67

0.1

2

3

4

55

67

1

2

3

4

55

67

10

2

3

4

55

67

100


Definite Time

RESET

OPERATE

Tim

e D

ial S

ettin

gs

.5

1

2

4

567

89

9.9

3




0361A7502


Tim

e in

Se

con

ds


GES10038

Figure 15: Definite Time

*(.��&


0.1 2 3 4 55 6 7 1 2 3 4 55 6 10 2 3 4 55 6 100

0.1

2

3

44

5

1

2

3

44

5

10

2

3

44

5

100

2

3

44

5

1000

2

3


I2T

RESET OPERATE

.5

1

2

3

Tim

e D

ial S

ettin

gs

4567

89 9.9




0358A1119


Tim

e in

Se

con

ds


GES10037

Figure 16: I 2t Time Curve

*(.��&


The I2T curve has a K value equal to the time dial times 250. The minimum value of K is 25 (0.1 times250) and the maximum value is 2475 (9.9 times 250).

Multples of Pickup Setting

2

3

4

5

6

7

8

9

100

Tim

ein

Mill

ise

co

nd

s

1 2 3 4 5 6 7 8 9 10

OVERCURRENT RELAYS

DIAC, DIFC, & DSFC

Instantaneous

1.51.1

GES10039

Current Range: 0.5 - 15.9 ( 5 Ampere Relays)

0361A7503

0.1 - 3.18 (1 Ampere Relays)


Power Management

Figure 17: IOC Curve

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CALCULATION OF SETTINGS

When replacing IAC, IFC or SFC relays, reviewthe time current curves of the digital relays toverify that they conform to the relays being re-placed. In some cases it may be necessary toredo the coordination study to assure coordina-tion with other devices.

The base time of the Definite Time Curve is 1second. The base time is multiplied by the timedial to provide the actual operating time. Thedefault or lowest time dial setting for the DefiniteTime Curve is 0.1.

The I2T curve has a K value of 250 @ time dialof 1. The range is from 25 to 2475 in steps of 25set by the time dial. The default or lowest timedial setting for the I2T curve is 0.1.

TOC pickup is settable from 0.5 to 15.9 amps in0.1 amp increments for the 5 amp model, and0.1 to 3.18 amps in 0.02 amp increments for the1 amp model, a setting of 0 disables the TOCelement. The time dial can be set from 0.5 to 9.9in 0.1 increments on both the 5 amp model and

the 1 amp model. The only exception is for theDefinite Time and I2T curves where 0.1 is theminimum value.

The IOC function is settable from 1 to 159 ampsin 1 amp increments for the 5 amp model, and0.2 to 31.8 amps in increments of 0.2 amps forthe 1 amp model. Setting the pickup to 0 dis-ables the IOC element. Both models have anIOC delay adjustment from 50 to 400 millisec-onds in 25 millisecond steps.

The formula: IOC delay in milliseconds = DS x25 + 25, where DS is setting on IOC delay dial.

The TOC reset characteristic can be controlledfrom the front panel. The TOC reset can be setto “timed reset” which emulates the characteris-tic of an induction disk relay, or “instantaneousreset” where the reset is fixed at 40 to 50 milli-seconds.

The system frequency can be set for 50 or 60 Hzcontrolled from the front panel.

*(.��&


HARDWARE DESCRIPTION

Case

DIAC and DSFC

The DIAC and DSFC relays consist of a case,cover, support structure, and a connection plugto make up the electrical connection. The case isshown in Figures 20 and 22. The external con-nections are shown in Figure 18. It has 10 con-nection points and a CT shorting bar. As theconnection plug is withdrawn the trip circuit isbroken prior to the current shorting bar engage-ment. The window provides visual indication ofthe CT shorting.

DIFC

The DIFC relays consist of a molded case,cover, support structure, and a connection plugto make up the electrical connection. The case isshown in Figures 20 and 21. The external con-nections are shown in Figure 19. It has 14 con-nection points and a visible CT shorting bar. Asthe connection plug is withdrawn the trip circuit isbroken prior to the current shorting bar engage-ment. The window provides visual indication ofthe CT shorting.

Adjustments

All customer settings are accessible from thefront of the relay. The cover must be removed togain access to the settings. The cover has provi-sions for a sealing “wire.” The settings are left toright, pickup current level for the time element,time dial, curve selection, frequency / reset time,pickup current level for the instantaneous ele-ment, and the instantaneous element time delay.The settings are all calibrated and are set byturning the rotary switch to the desired value.The switches are recessed; a small screwdriveris required to make the adjustment.

The relay may be supplied with one of threepointer styles as shown. The color is the color ofthe indicator, note the arrow location, allswitches are shown in the 9:00 position.

The TOC pickup current is set directly in Ampswith two rotary switches. An arrow is used to in-dicate setting position. Setting the TOC or theIOC pickup current between, but not including 0and a value less than minimum 0.5 (5 amp) or0.1 (1 amp) will result in the relay defaulting to itsminimum setting. Setting the TOC or IOC pickup

current to 0 will disable their respective ele-ments. Although the time dial can be set to avalue less than minimum the relay will use theminimum setting.

The relay also provides a front panel trip circuittest. An actuating lever that must be pulled andthen lifted is provided to trip the device con-nected to the relay. The level directly operatesthe trip contacts.

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<HOORZ 2UDQJH :KLWH

Targets And Indicators

The yellow pick-up LED will come on solid for theTOC function when the input current to the relayis higher than the set point. The location of theLED is between the frequency/reset switch andthe IOC pickup level switch.

It may be desirable to know when the relay ispowered up and operating. The relay must beenergized at or above 95% of the minimum pos-sible setting and below pick-up set point. To ac-tivate, turn the SELECT switch one step clock-wise or one step counterclockwise. This willcause the pickup LED to blink at 4 second inter-vals while current is below the pick-up set point.Minimum current is 95% of minimum TOCpickup setting for both the 1amp and 5 ampmodels. A blinking LED indicates the microproc-essor is executing code and outputting signals.

The relay uses a target and seal-in unit as itstripping element. The relays have one TOC tar-get and one IOC target. The targets are me-chanically latched when the function trips. Thetrip contacts will remain closed until the trip cir-cuit current drops below 0.19 A.

NOTE: Do not attempt to reset the trip targetwhile DC is still applied – this may damagethe output contact.

*(.��&


Reset And Manual Trip

Targets can be reset by depressing the frontcover target reset button for the DIFC or liftingthe target reset level at the lower left edge of thecover on the DIAC and DSFC.

Trip Circuit Test

The front panel contains two manual trip leversto test the trip circuit. The relay cover must beremoved to access the lever. The lever must bepulled and then lifted which prevents uninten-tional uplifted to prevent unintentional operation.

Trip Circuit

CAUTION: The trip circuit is polarity sensi-tive. The trip circuit will not be damaged ifconnected in reverse. However, it will not tripthe associated breaker. The trip circuit isconfigured to have the positive battery ter-minal connected to Stud 1 for the TOC andIOC trip circuit and the negative to Stud 2(TOC) and Stud 3 (IOC).

NOTE: Both trip circuits are suitable for usewith Cap-Trip devices.

Cover Installation DIAC and DSFC

NOTE: When replacing the cover on the DIACand DSFC relays the reset wire should be“locked” behind the nameplate by a slight left toright motion to place the reset wire in the correctposition.

Receiving, Handling And Storage

Immediately upon receipt, the relay should beunpacked and examined for any damage sus-tained during shipment. If damage occurredduring shipment a damage claim should be filedat once with the transportation company, and thenearest GE sales office should be notified. If therelay is not installed immediately, it should bestored in its original carton in a location that isdry and protected from dust, metallic chips andsevere atmospheric conditions.

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INSTALLATION

Environment

Installation of the relay should be in a clean drylocation that is free from dust.

Mounting

The relay should be securely mounted on a ver-tical surface that provides accessibility to boththe front and rear of the unit. The outline andpanel drilling dimensions are provided in figures20, 21, 21A, and 22 for each stile case. An addi-tional surface mounting option is available for theDIFC relay.

Surge Ground (DIAC and DSFC)

The relay should be grounded to the stationground mat with a 12 AWG braided ground leadconnected to terminal 4. If the relay is to beretrofitted in a panel, terminal 4 should beremoved from the new case and installed intothe old case. For the surge protection to functionproperly the relay must be grounded.

Surge Ground and RFI Immunity(DIFC only)

The relay should be grounded to the stationground mat with a 12 AWG braided ground leadconnected to Terminal 4 when replacing IFCrelays. The IFC relay and case must be removedand replaced with the DIFC relay and case.

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Figure 18: DIAC and DSFC External / Internal Connections

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Figure 19: DIFC External / Internal Connections

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6.625

PANEL

CASE

.75

3.0

STUDNUMBERING

13579

10 8 6 4 2

6.187

5.687

2.187

4.375 8.812CUTOUT

.500

(TYPICAL)

5.25

5/8 DRILLCUTOUT MAY REPLACE

DRILLED HOLES

PANEL LOCATION

GLASS

(4) 10-32 X 3/8

MTG. SCREWS

.218

2 HOLES

1.46837MM

133MM 12MM

3/4 DRILL10 HOLES

5MM

224MM

56MM

112MM

168MM

29MM 19MM

157MM

9.125232MM

4.406112MM

3.90699MM

76MM

1.125

144MM

BACK VIEW

CL

LC LC

15MM

19MM

MTG.MTG.SEMI-FLUSH SURFACE (2) 5/16-18 STUDS

FOR SURFACE MTG.

10-32STUDS

8.375212MM

76MM

TYPICAL DIM.

INCHESMM

VIEW SHOWING ASSEMBLY OF HARDWAREFOR SURFACE MTG. ON STEEL PANELS

PANEL DRILLINGFOR SEMI-FLUSH MOUNTING

FRONT VIEW

5/16-18 STUD

PANEL DRILLINGFOR SURFACE MOUNTING

FRONT VIEW

1/4 DRILL4 HOLES6MM

2.84372MM

1.15629MM

109MM

.2506MM

3.076MM

.71818MM

4.281

3.0

5MM.218

Figure 20: DIAC Panel Mounting and Drilling

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RELAY

FRONT VIEW

3.688

6.062

3.062

6.124

1

214

13

CUTOUT

REAR VIEW

MOUNTING SURFACE

10-32 SCREWSCONNECTIONSEXTERNAL

C

C

C

C

C

SIDE VIEW

7.563

SEE VIEW "B"

(2) .750 HOLES

4.750

2.375

.250

2.000

5.00

NUMBERINGSTUD

SIDE VIEW

EXTERNALCONNECTIONS10-32 SCREWS

MOUNTING SURFACE

SEE VIEW "C"

C

C

3.688

SURFACE MOUNTING FOR.188 (5MM) THK.

SURFACE MOUNTING FOR

2.375

4.750

.469

.156

.625 TYP.

PANEL DRILLING

REFER TO RELAY FORQUANTITY OF HOLES.

.750

.625

NUT

HDW. 0257A8549-G2VIEW "C"

REMOVE KNOCKOUT

8-36SCREW

WASHER

MOUNTINGSURFACE

LKWASH

SURFACEMOUNTING

WASHER

8-36

VIEW "B"HDW. 0257A8549-G2

NUT

( 2) . 219 HL S

SPACER

L OCK WASHER

SCREWREMOVE KNOCKOUT

OVERSIZE WASHERS

2.500

8.344

.188 (5MM) THK. MAX. PANEL

F OR . 312 HL S

7.376187MM

94MM

154MM

PANEL DRILLING

5.562141MM

71MM2.7813.031

77MM

156MM

78MM

192MM

61MM

121MM

19MM

7MM

51MM

64MM

128MM

212MM

94MM

12MM

19MM

16MM

16MM

8MM4MM

5MM

61MM

121MM

AND OVER.AND OVER.

Figure 21: DIFC Panel Mounting and Drilling

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RELAY

FRONT VIEW

3.688

6.062

3.062

6.124

1

214

13

CUTOUT

REAR VIEW

MOUNTING SURFACE

10-32 SCREWSCONNECTIONSEXTERNAL

C

C

C

C

C

SIDE VIEW

7.563

SEE VIEW "B"

(2) .750 HOLES

4.750

2.375

.250

2.000

5.00

NUMBERINGSTUD

SIDE VIEW

EXTERNALCONNECTIONS10-32 SCREWS

MOUNTING SURFACE

SEE VIEW "C"

C

C

3.688

SURFACE MOUNTING FOR.188 (5MM) THK.

SURFACE MOUNTING FOR

2.375

4.750

.469

.156

.625 TYP.

PANEL DRILLING

REFER TO RELAY FORQUANTITY OF HOLES.

.750

.625

NUT

HDW. 0257A8549-G2VIEW "C"

REMOVE KNOCKOUT

8-36SCREW

WASHER

MOUNTINGSURFACE

LKWASH

SURFACEMOUNTING

WASHER

8-36

VIEW "B"HDW. 0257A8549-G2

NUT

( 2) . 219 HL S

SPACER

L OCK WASHER

SCREWREMOVE KNOCKOUT

OVERSIZE WASHERS

2.500

8.344

.188 (5MM) THK. MAX. PANEL

F OR . 312 HL S

7.376187MM

94MM

154MM

PANEL DRILLING

5.562141MM

71MM2.7813.031

77MM

156MM

78MM

192MM

61MM

121MM

19MM

7MM

51MM

64MM

128MM

212MM

94MM

12MM

19MM

16MM

16MM

8MM4MM

5MM

61MM

121MM

AND OVER.AND OVER.

Figure 22: SURFACE MOUNTING DIFC

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6.625

PANEL

CASE

.75

3.0

STUDNUMBERING

13579

10 8 6 4 2

6.187

5.687

1.125

2.25 6.687CUTOUT

.500

(TYPICAL)

5.25

5/8 DRILLCUTOUT MAY REPLACE

DRILLED HOLES

PANEL LOCATION

GLASS

(4) 10-32 X 3/8

MTG. SCREWS

.218

2 HOLES

1,46837MM

133MM 12MM

3/4 DRILL10 HOLES

5MM

169MM

28MM

57MM

168MM

29MM 19MM

157MM

7177MM

3.34384MM

2.84472MM

76MM

1.125

144MM

BACK VIEW

CL

LC LC

15MM

19MM

MTG.MTG.SEMI-FLUSH SURFACE (2) 5/16-18 STUDS

FOR SURFACE MTG.

10-32STUDS

5.625142MM

76MM

TYPICAL DIM.

INCHESMM

VIEW SHOWING ASSEMBLY OF HARDWAREFOR SURFACE MTG. ON STEEL PANELS

PANEL DRILLINGFOR SEMI-FLUSH MOUNTINGFOR SEMI-FLUSH MOUNTING

FRONT VIEW

5/16-18 STUD

PANEL DRILLINGFOR SURFACE MOUNTING

FRONT VIEW

1/4 DRILL4 HOLES6MM

2.84372MM

.0942.38MM

.81MM

2.506MM

.71818MM

3.219

3.0

5MM.218

1.7544MM

Figure 23: DSFC Panel Mounting and Drilling

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ACCEPTANCE TESTS

Immediately upon receipt of the relay, aninspection and acceptance test should be madeto make sure that no damage has beensustained in shipment, and that the relaycalibrations have not been disturbed.

Visual Inspection

Check the nameplate stamping to make surethat the model number and rating of the relayagree with the requisition. Remove the relayfrom its case and check that there are no brokenor cracked molded parts or other signs ofphysical damage, and that all screws are tight.

Mechanical Inspection

1. The target and seal-in unit, pull and liftthe TOC lever to test the target, repeatthe test for the IOC target. The Targetflag should remain when the lever is re-leased. Reset the target by pushing thereset bar.

2. Make sure that the fingers and shortingbars agree with the internal connectionsdiagram.

CAUTION: Every circuit in the drawout casehas an auxiliary brush. It is especially impor-tant on current circuits and other circuitswith shorting bars that auxiliary brush bebent high enough to engage the connectionplug or test plug before the main brushes do.This will prevent CT (current Transformer)secondary circuits from being opened.

Electrical Tests

DRAWOUT RELAYS, GENERAL

Since all drawout relays in service operate intheir cases, it is recommended that they betested in their cases or an equivalent case. Arelay may be tested without removing it from thepanel by using the appropriate test plug. For a Ccase, use the XCA test plug; for a V or S case,

use the XLA series test plug (refer to the GEPower Management Product Catalog). Althoughthe test plugs provide greater flexibility, it re-quires C.T. shorting jumpers and exercise ofgreater care since connections are made to boththe relay and the external circuitry.

INVERSE TIME UNIT

Pickup Verification

• Connect the relay as indicated in Figure 24or 25. In order to apply current to the relay,use a 50/60 Hz voltage source, with a vari-able resistor in series, or an electronic cur-rent source.

• Set the relay at the desired pickup TOC anddisable the instantaneous unit by setting theinstantaneous current setting to zero (0).

Apply current to the relay and verify that thePickup LED on the front of the relay lights be-tween 98% and 102% of the pickup TOC setting.If the relay is set to blink between power up andpickup, look for the LED to be on most or all ofthe time to indicate pickup.

Reduce the current applied, verifying that at avalue between 95% and 100% of the pickupTOC, the relay Pickup LED turns off or blinks ifset to blink.

Verification of Operating Time

Because the Digital self powered series of relayshas many different curve characteristics, thebasic test instruction will be given and the datafor each of the curves can be found in Table 1.With the relay still connected as indicated inFigure 24 or 25, set the time overcurrent unit tominimum pickup and set the corresponding timedial to 5. Successively apply currents of 2, 5, and10 times pickup TOC, verifying that the operatingtimes are within the margins indicated in Table 1.

NOTE: Before attempting to reset the triptarget, ensure the DC supply is removed orturned off from the trip circuit setup

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Note: Time measured in seconds

Table 1: Pickup Times for Varying Multiples of Pickup (MPU)MPU

CURVE* 2 5 10

IAC 51 3.62 - 4.005 1.69 - 1.86 1.19 - 1.32

IAC 53 6.66 - 7.36 1.25 - 1.37 0.687 - 0.759

55-ST 0.298 - 0.330 0.155 - 0.17 0.133 - 0.14

57-MT 20.4 - 22.62 8.82 - 9.75 5.7 - 6.3

66-LT 42.7 - 47.2 17.28 - 19.1 10.78 - 11.9

75-ST 0.748 - 0.827 0.3113 - 0.344 0.244 - 0.2707

IAC 77 6.49 - 7.17 0.859 - 0.954 0.266 - 0.296

95-ST 0.895 - 0.994 0.356 - 0.396 0.276 - 0.303

IEEE Inverse 3.59 - 3.99 1.59 - 1.76 1.12 - 1.25

IEEE Very Inverse 6.51 - 7.24 1.21 - 1.34 0.64 - 0.71

IEEE Ext. Inverse 8.76 - 9.73 1.18 - 1.32 0.374 - 0.412

IEC Inverse 4.73 - 5.26 2.0 - 2.22 1.39 - 1.54

IEC Very Inverse 6.31 - 7.014 1.56 - 1.73 0.69 - 0.768

IEC Ext. Inverse 12.3 - 13.7 1.51 - 1.67 0.369 - 0.41

Definite Time 4.71 - 5.24 4.71 - 5.24 4.71 - 5.21

12T 1.175 - 1.31 0.191 - 0.212 0.051 - 0.056

* TD = 5

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For the Definite Time Characteristics, based onany current input, the time should be half of themaximum value.

Verification of Time Dial

Set the relay at the minimum pickup TOC andverify that with an input current of five times (5x)pickup TOC, the operating time is between themargins shown in Table 2.

Table 2: Pickup Times for Varying Time Dials

Time Dial

CURVE* 10 7 3 1

IAC51 3.64 - 4.05 2.42 - 2.69 0.996 - 1.106 0.372 - 0.413

IAC53 2.73 - 3.03 1.78 - 1.98 0.742 - 0.824 0.025 - 0.028

55-ST 0.29 - 0.32 0.21 - 0.23 0.10 - 0.12 0.058 - 0.064

57-MT 17.3 - 19.3 12.2 - 13.65 5.27 - 5.86 1.783 - 1.98

66-LT 33.9 - 37.7 24.1 - 26.7 10.3 - 11.4 3.46 - 3.848

75-ST 0.577 - 0.641 0.424 - 0.471 0.2 - 0.221 0.09 - 0.1

IAC77 1.81 - 2.013 1.2 - 1.33 0.545 - 0.605 0.228 - 0.253

95-ST 0.69 - 0.767 0.49 - 0.544 0.23 - 0.252 0.102 - 0.11

IEC Inverse 3.94 - 4.37 2.79 - 3.1 1.21 - 1.34 0.431 - 0.478

IEC Very Inverse 3.06 - 3.402 2.17 - 2.415 0.95 - 1.05 0.332 - 0.369

IEC Ext. Inverse 2.95 - 3.284 2.109 - 2.33 0.913 - 1.015 0.329 - 0.364

IEEE Inverse 3.108 - 3.45 2.206 - 2.45 0.95 - 1.06 0.345 - 0.384

IEEE Very Inverse 2.39 - 2.635 1.69 - 1.88 0.745 - 0.828 0.273 - 0.304

IEEE Ext. Inverse 2.32 - 2.58 1.65 - 1.84 0.734 - 0.815 0.266 - 0.296

Definite Time 9.5 - 10.5 6.65 - 7.31 2.83 - 3.15 0.95 - 1.05

12T 0.351 - 0.3865 0.256 - 0.282 0.124 - 0.137 0.0664 - 0.073

* MPU = 5X

*(.��&


INSTANTANEOUS UNIT

The Instantaneous unit is designed similarly to ahinged armature instantaneous unit. Theinstantaneous unit will react differentlydepending on how the signal is applied. If thesignal is applied suddenly with no prefaultcurrent, the operating time will be longer. If aprefault current is applied prior to the fault theoperating time will be shorter. The following testdetermines that the instantaneous unit is workingcorrectly and confirms the operating time forfaults applied with no prefault current.

Connect the relay as shown in Figure 26 or 27,Set the instantaneous unit pickup to 2 amps (5amp rated relay) or 0.4 amps (1 amp rated relay)with a zero IOC delay setting. Apply 6 amps (5amp rated relay) or 1.2 amps (1 amp rated relay)and measure the operating time. The operatingtime should be between 32 ms and 46 ms. Thistime is subject to dependent on the multiple ofpickup current and the fault incidence angle. Agraph of how the instantaneous unit varies as afunction of input current is provided in this bookfor reference, Figure 17.

Target andSeal-in

AUX TOC

contact

T11

T12

T2

T1

Iin

T5

T6

Single Phase

Current Source

Start StopTIMER

– Negative

36/300VDCPower Supply

Current Limited to200 mA

+ Positive

Figure 24: DIFC Test Setup for Pickup and Operating Time Verification

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Target andSeal-In

AUX TOCContact

T7

T8

T2

I in

T5

T6

Single PhaseCurrent Source

Start StopTIMER

- Negative

36 / 300 V DCPower Supply


+ Positive

Figure 25: DIAC or DSFC Test Setup for Pickup and Operating Time Verification

Target andSeal-In

AUX TOCContact

T7

T8

T2

I in

T5

T6


Start StopTIMER

- Negative



+ Positive

Figure 26: DIFC Test Setup for Instantaneous Unit

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Target andSeal-In

AUX TOCContact

T7

T8

T2

I in

T5

T6


Start StopTIMER

- Negative


Current Limitedto 200 mA

+ Positive

Figure 27: DIAC or DSFC Test Setup for Instantaneous

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PERIODIC TESTS AND SERVICING

Periodic Tests

It is recommended that the user perform aperiodic test to verify that the relay is operatingproperly. It is recommended that a portion of theacceptance tests be performed to verify therelay. An inspection of the seal-in contacts canbe performed by removing the relay from itscase and visually inspecting the contacts forcorrosion.

Servicing

If the relay fails to perform as specified in thisinstruction manual consult the factory or call yourlocal GE sales office. Before returning the relayconsult with the factory’s technical support.

It is not recommended that the relay be servicedto the component level. This requires substantialinvestment in repair/test equipment and intechnical expertise, and usually results in alonger down time than if a spare relay were usedin its place, while the unit is shipped back to thefactory.

Figure 28 (9819647/8919648): DIAC Front and Rear Views

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Figure 29 (8919652/8919653): DIFC Front and Rear Views

Figure 30 (8919632/8919661): DSFC Front and Rear Views

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SPECIFICATIONS

Burdens

Burdens for the over-current units are listed in Table 3. Burdens decrease with increasing current aboveminimum setting, due to the power supply shunting in the power supply circuit. Since the power supply isthe major portion of the burden, the burden for a given input current will be constant, irrespective of pick-up settings on both TOC and IOC units.

Table 3: Burden Settings

Burden @ Minimum Setting Burden in ohms (Z) at multiples ofminimum pickup

Unit Range Hz R jX Z ∠ 3 × 10 × 20 × 100 ×

1 A 0.1 / 31.8 60 28.8 29.2 41.3 45° 9.36 2.32 1.24 0.768

5 A 0.5 / 15.9 60 1.28 1.15 1.74 42° 0.394 0.094 0.052 0.034

4 55 6 7 8 1 2 3 4 55 6 7 10 2 3 4 55 6 1003

4

1

2

33

4

10

2

33

4

100

2

DIAC, DIFC, & DSFCOVERCURRENT RELAYS

Burden

0.1 2 3 4 55 6 7 8 1 2 3 4 55 6 7 10 2

5AMP Model

1AMP Model

� Power ManagementFrequency: 50/60 Hertz

0.1 - 3.18 (1 Ampere Relays)General Electric CO., 205 Great Valley Parkway, Malvern, PA

0361A7504

Input Current

Current Range: 0.5 - 15.9 ( 5 Ampere Relays)

GES10040

Bu

rde

n in

VA

Figure 31: Burden curve

*(.��&


RatingsFrequency: 50 / 60 HzCurrent: 1A or 5A ModelsMaximum Permissible Current, 1 A Model: Continuous: 3 A 3 seconds: 50 A 1 second: 100 AMaximum Permissible Current, 5 A Model: Continuous: 15 A 3 seconds: 250 A 1 second: 500 AOperating Current Range, 1 A Model minimum: 0.095 A I2T (constant): 1520Operating Current Range, 5 A Model minimum: 0.475 A I2T (constant): 38000Maximum Transient Overreach: 7%

Burdens0.1/0.5 A (1/5A unit): 0.475 VA1.0/5 A (1/5A unit): 2.6 VA

See Figure 31 for curve and Table 3 for settings.

Contact RatingsOutput Contacts:

Vol

tage

Con

t.

Mak

e an

d ca

rry

1 se

c.

Bre

ak

Max

load

DCResistive

125V250V

10A 30A 0.5A0.3A

60W

DCInductive

L/R=40ms

125V250V370V

10A 30A 0.25A0.15A0.05A

50VA

NOTE: Suitable for Cap-Trip devices.

EnvironmentalAmbient Temperature: Storage: 40 to 85°C Operation: –40 to 70°C Humidity: Up to 95% without

condensing.

Insulation Withstand TestsImpulse Voltage: 5 kV peak, 1.2 / 50 µs,

0.5 Joules.Per: IEC255-5, Class III

Surge Withstand CapabilityFast Transient: per ANSI C37.90.1 and

IEC 255-22-4 Class IVOscillatory: per ANSI C37.90.1 and

IEC 255-22-1 Class IV

Radio Frequency Withstand25 MHz to 1 GHz keyed every 1 MHz for 2 sec.;per ANSI C37.90.2 andIEC 255-22-3

Electrostatic DischargePer: IEC 225-22-2

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APPLICATION NOTES

IOC/TOC Unit

The relay has one TOC target and one IOC tar-get and uses a seal-in unit as its tripping ele-ment. The trip contact remains closed until thetrip circuit drops below 0.19 A. A breaker contact

(52a) can be provided in series with the trip cir-cuit to reset the target once the breaker trippedon fault.

TOCIOC

TripCoil

+ DC Supply

- DC Supply

Breaker Contact(52a)

T3

T1

T2

Figure 32: IOC/TOC UNIT

��*(�3RZHU�0DQDJHPHQW

215 Anderson AvenueMarkham, OntarioCanada L6E 1B3Tel: (905) 294-6222Fax: (905) 201-2098www.GEindustrial.com/pm

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