GE IAC77A User manual

GEK

34055

INSTRUCTIONS

TIME

OVERCURRENT

RELAYS

TYPES

IAC

FORM

800

AND

IAC

FORM

800

AND

IAC

FORM

800

AND

IAC

FORM

800

AND

GENERAL

ELECTRIC

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GEK

34055

TABLE

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CONSTRUCTION

RATINGS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

. .

TARGET

AND

SEAL

UNIT

CONTACTS

BURDENS

CHARACTERISTICS

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

ELECTRICAL

TESTS

DRAWOUT

RELAYS

GENERAL

POWER

REQUIREMENTS

GENERAL

TIME

OVERCURRENT

UNIT

PICKUP

TEST

TIME

TEST

INSTANTANEOUS

UNIT

SETTING

THE

INSTANTANEOUS

UNIT

PICK

TESTS

TARGET

AND

SEAL

UNIT

PICK

AND

DROPOUT

TEST

INSTALLATION

TIME

OVERCURRENT

UNIT

TARGET

AND

SEAL

UNIT

INSTANTANEOUS

UNIT

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

TARGET

AND

SEAL

UNIT

CONTACT

CLEANING

SYSTEM

TEST

SERVICING

TIME

OVERCURRENT

UNIT

TIME

TESTS

INSTANTANEOUS

UNIT

TARGET

AND

SEAL

UNIT

RENEWAL

PARTS

(

Cover

photo

8041299

)

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GEK

34055

TIME

OVERCURRENT

RELAYS

TYPES

IAC

FORM

800

and

DESCRIPTION

nype

IAC

and

IAC

relays

are

single

phase

current

operated

ices

with

extremely

inverse

time

current

characteristics

They

can

utilized

protect

commercial

industrial

and

utility

power

distribution

systems

against

either

multi

phase

ground

faults

Each

relay

consists

basic

induction

disk

time

overcurrent

unit

and

dual

rated

target

seal

unit

and

may

include

hinge

type

instantaneous

overcurrent

unit

Both

the

time

overcurrent

unit

and

the

instantaneous

unit

are

adjustable

over

range

about

The

available

ranges

amperes

both

units

well

information

their

continuous

rating

contact

rating

and

target

seal

unit

tap

ratings

are

given

the

section

RATINGS

standard

case

used

mount

each

relay

mounting

dimensions

this

case

are

shown

Figures

and

The

outline

and

The

basic

differences

between

the

relays

covered

these

instructions

are

noted

the

following

Table

TABLE

INSTANTANEOUS

CONTACT

CIRCUITS

INTERNAL

CONNECTIONS

TYPE

UNIT

IAC

FIGURE

YES

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

’

purposes

the

matter

should

referred

the

General

Electric

Company

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Courtesy of NationalSwitchgear.com

GEK

34055

APPLICATION

The

extremely

inverse

time

current

characteristics

make

the

IAC

relays

particularly

well

suited

for

the

protection

such

applications

because

the

power

fuses

possible

obtain

and

primary

distribution

circuits

relay

characteristics

closely

parallel

those

the

normally

employed

these

circuits

selective

fault

protection

with

minimum

time

delay

The

unique

time

current

characteristics

these

relays

also

make

them

well

suited

for

picking

cold

loads

For

any

given

cold

load

pick

capability

the

resulting

setting

will

provide

faster

protection

high

fault

currents

with

the

extremely

inverse

relay

than

with

less

inverse

devices

The

general

practice

use

set

three

relays

for

interphase

faults

separate

relay

residually

connected

can

utilized

for

single

phase

ground

faults

Use

separate

ground

relay

advantageous

because

can

adjusted

provide

sensitive

protection

ground

faults

Typical

connections

for

applying

these

relays

are

shown

Figures

and

the

application

IAC

and

IAC

relays

with

automatic

reclosing

devices

the

reset

time

should

considered

The

reset

time

all

relays

covered

these

instructions

approximately

seconds

from

the

fully

closed

the

fully

open

position

when

set

number

the

time

dial

When

setting

these

relays

coordinate

with

downstream

relays

coordination

time

from

0.25

second

generally

allowed

These

coordination

times

include

addition

breaker

clearing

time

0.10

second

for

relay

overtravel

and

0.17

second

for

safety

factor

For

example

the

breaker

clearing

time

0.13

second

(

cycles

)

the

coordination

time

would

0.40

second

the

relay

time

set

test

the

current

level

question

the

safety

factor

may

reduced

from

0.17

0.07

second

Then

with

relay

overtravel

second

the

downstream

breaker

time

cycles

(

0.08

second

)

minimum

0.25

second

could

allowed

for

coordination

the

downstream

devices

are

fuses

rather

than

circuit

breakers

then

the

maximum

clearing

time

the

fuse

should

used

and

the

time

allowed

for

breaker

clearing

time

should

omitted

CONSTRUCTION

The

induction

unit

the

basic

unit

all

Type

IAC

relays

Figures

and

show

the

induction

unit

mounted

the

cradle

These

units

are

the

induction

disk

construction

type

The

disk

actuated

wattmetric

type

current

operating

element

This

similar

the

standard

element

used

watthour

meters

except

the

actuating

coils

above

and

below

the

operating

disk

are

connected

series

capacitor

and

variable

resistor

connected

series

with

the

inner

coil

the

upper

laminated

structure

makes

the

phase

shifting

circuit

contact

which

completes

the

trip

alarm

circuit

restrained

spiral

spring

give

proper

contact

closing

The

disk

shaft

carries

the

moving

The

disk

shaft

Courtesy of NationalSwitchgear.com

GEK

34055

and

its

motion

retarded

permanent

magnet

acting

current

the

disk

give

correct

time

delay

There

target

and

seal

unit

mounted

the

front

the

left

the

shaft

the

time

overcurrent

unit

The

seal

unit

has

its

coil

series

and

its

contacts

parallel

with

the

contacts

the

time

overcurrent

unit

such

that

when

the

induction

unit

contacts

the

seal

unit

picks

and

seals

When

the

seal

unit

picks

raises

target

into

view

which

latches

and

remains

exposed

until

released

pressing

button

beneath

the

lower

left

corner

the

cover

The

instantaneous

unit

small

hinge

type

unit

which

mounted

the

front

the

models

the

right

the

shaft

the

time

overcurrent

unit

Its

contacts

are

normally

connected

parallel

with

the

contacts

the

time

overcurrent

unit

and

its

coil

connected

series

with

the

time

overcurrent

unit

instantaneous

unit

picks

raises

target

which

latches

and

remains

exposed

until

released

the

target

the

seal

unit

also

releases

the

target

the

instantaneous

unit

When

the

The

same

button

that

releases

RATINGS

TIME

OVERCURRENT

UNIT

Ratings

the

time

overcurrent

unit

are

given

Table

TABLE

PICK

RANGE

AMPERES

MAIN

(

TIME

)

FREQUENCY

CYCLES

INSTANTANEOUS

RELAY

UNIT

0.5

4.0

1.5

12.0

2.0

15.0

IAC

and

IAC

0.5

4.0

1.5

12.0

2.0

15.0

0.5

4.0

2.0

16.0

10.0

80.0

20.0

160.0

IAC

and

IAC

Available

taps

the

ime

overcur

rent

unit

are

shown

Table

III

TABLE

III

TAPS

AVAILABLE

(

AMPERES

)

RANGE

AMPERES

0.5

0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5

3.0

4.0

0.5

4.0

1.5

12.0

1.5

2.0

2.5

3.0

4.0

5.0

6.0

7.0

8.0

10.0

12.0

2.0

15.0

2.0

2.5

3.0

4.0

5.0

6.0

7.0

8.0

10.0

12.0

15.0

The

one

second

thermal

ratings

are

listed

Table

Courtesy of NationalSwitchgear.com

GEK

34055

TABLE

TIME

OVERCURRENT

UNIT

(

AMPS

)

ONE

SECOND

RATING

(

AMPS

)

0.5

4.0

125.0

625

1.5

12.0

260.0

600

2.0

15.0

260.0

600

For

ratings

less

than

one

second

the

rating

may

calculated

according

the

formula

where

the

time

seconds

that

the

current

flows

The

continuous

ratings

the

time

overcurrent

units

are

shown

Table

TABLE

0.5

4.0

AMP

RANGE

TAP

0.5

0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5

3.0

4.0

RATING

3.5

3.7

4.0

4.5

5.0

5.5

6.0

7.0

8.0

9.0

10.0

1.5

12.0

AMPRANGE

TAP

1.5

2.0

2.5

3.0

4.0

5.0

6.0

7.0

8.0

10.0 12.0

RATING

9.5

10.5 11.5

12.5

14.0

15.5

17.0 18.0 19.0

20.0 20.0

2.0

15.0

AMPRANGE

TAP

2.0

2.5

3.0

4.0

5.0

6.0

7.0

8.0

10.0

12.0

15.0

RATING

10.0

11.0

12.0

13.0

15.0

17.0

18.0 19.0

20.0

INSTANTANEOUS

UNIT

The

instantaneous

unit

has

double

wound

coil

for

operation

Any

setting

obtained

the

lower

range

either

one

two

ranges

(

series

connected

)

doubled

within

when

the

unit

connected

for

high

range

operation

(

parallel

connected

)

Courtesy of NationalSwitchgear.com

GEK

34055

The

instantaneous

unit

has

continuous

rating

minimum

setting

amperes

whichever

smaller

2.0

16.0

ampere

instantaneous

unit

8.0

amperes

)

has

continuous

rating

3.0

connected

for

high

range

operation

(

4.0

16.0

continuous

rating

6.0

amperes

ratings

for

the

instantaneous

unit

are

shown

Table

times

The

1.5

Example

when

set

the

low

range

(

2.0

amperes

and

when

amperes

)

has

The

continuous

and

one

second

TABLE

RANGE

CONNECT

CONTINUOUS

RATING

ONE

SECOND

IONS

0.5

4.0

0.5

2.0

4.0

0.75

25.0

625

1.0

1.5

50.0

500

2.0

16.0

2.0

130.0

260.0

900

600

8.0

16.0

3.0

4.0

6.0

10.0

80.0

10.0

40.0

20.0

80.0

15.0

160

000

360

000

400.0

600.0

25.0

20.0

160.0

20.0

80.0

40.0

160.0

25.0

600.0

360

000

360

000

25.0

Higher

currents

may

applied

for

shorter

lengths

time

accordance

with

the

formula

where

the

time

seconds

that

the

current

flows

Series

connected

Parallel

connected

TARGET

AND

SEAL

UNIT

Ratings

for

the

target

seal

unit

are

shown

Table

VII

TABLE

VII

TAP

0.2

2.0

Resistance

(

ohms

)

0.13

MIN

Operating

(

amperes

)

2.0

0.2

Carry

Continuously

(

amperes

)

0.3

3.0

Carry

Amps

for

(

sec

)

0.03

4.0

Carry

Amps

for

(

sec

)

0.25

30.0

Impedance

(

ohms

)

52.0

0.53

Courtesy of NationalSwitchgear.com

GEK

34055

the

tripping

current

exceeds

amperes

auxiliary

relay

should

used

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

contacts

the

target

and

seal

coils

the

protective

relay

CONTACTS

The

current

closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts

The

current

carrying

rating

limited

the

ratings

the

seal

unit

BURDENS

Burdens

for

the

time

overcur

rent

unit

are

given

Table

VIII

TABLE

VIII

BURDENS

MIN

PICKUP

MIN

TAP

BURDENS

OHMS

(

)

AMPS

20.0

CALCULATED

FROM

IMPEDANCE

MIN

PICKUP

(

)

RANGE

MIN

TAP

TIMES

PICK

UP UP

0.5

0.4

0.5

0.80

1.38

1.60 1.60

1.5

12.0

1.5

0.085

147

0.17

0.17 0.17 0.17

4.25

2.0

15.0

2.0

0.05

0.086

0.099

0.10 0.10 0.10

2.5

The

impedance

values

given

are

those

for

the

minimum

tap

each

relay

cur

rent

NOTE

The

impedance

for

other

taps

(

tap

rating

)

varies

inversely

For

4.0

amp

range

the

1.60

ohms

pick

(

approximately

)

the

square

the

tap

rating

example

for

relay

with

0.5

impedance

the

0.5

amp

tap

given

The

impedance

the

2.0

amp

tap

2.0

amperes

(

)

1.6

0.10

ohm

Courtesy of NationalSwitchgear.com

GEK

34055

The

instantaneous

unit

burdens

are

listed

Table

TABLE

BURDENS

MIN

PICKUP

MIN

TAP

BURDENS

OHMS

(

)

RANGE

RELAYS

CON

MIN

NEC

TAP

TIONS

AMPS

20.0

OHMS OHMS

OHMS

TIMES

PICK PICK

PICK

AMPS

CALCULATED

FROM

IMPEDANCE

MIN

PICKUP

(

)

ONLY

(

AMPS

)

0.5

12.7

11.5

17.1

1.0

3.18

2.87

4.28

LOW

9.6

8.7

8.2

2.40

2.18

2.04

427.5

107.0

0.5

4.0

HIGH

1.05

LOW

2.0

0.76

0.72

0.189

0.180

0.261

0.147

0.133

0.125

0.59

0.53

0.50

26.25

2.0

16.0

HIGH

4.0

6.63

10.0

LOW

0.042

0.029

0.051

0.029

0.026

0.024

0.010

0.007

0.013

0.007

0.006

1.28

10.0

80.0

HIGH

20.0

0.33

0.015

0.008

0.017

0.010

0.009

0.008

0.004

0.002

0.004

0.002

LOW

20.0

0.43

20.0

160.0

HIGH

40.0

0.10

Low

means

two

windings

connected

series

High

means

two

windings

connected

parallel

See

Internal

Connections

diagram

for

additional

information

CHARACTERISTICS

Pickup

these

relays

defined

the

current

required

the

contacts

from

the

0.5

time

dial

position

The

pickup

value

the

IAC

relays

within

the

tap

value

The

setting

the

time

dial

determines

the

length

time

the

unit

requires

its

contacts

when

the

current

reaches

the

predetermined

value

The

contacts

are

just

closed

when

the

dial

set

zero

When

the

dial

set

the

disk

must

travel

the

maximum

distance

the

contacts

;

this

gives

the

maximum

time

setting

The

unit

resets

the

minimum

closing

value

current

Figure

shows

the

and

Figure

shows

the

Time

Current

Characteristics

for

Relay

types

IAC

and

IAC

The

time

reset

the

time

dial

position

when

the

current

reduced

zero

approximately

seconds

The

time

current

curve

for

the

instantaneous

unit

shown

Figure

RECEIVING

HANDLING

AND

STORAGE

These

relays

when

not

included

part

control

panel

will

shipped

cartons

designed

protect

them

against

damage

Immediately

upon

receipt

relay

examine

for

any

damage

Courtesy of NationalSwitchgear.com

GEK

34055

sustained

transit

handling

evident

transportation

company

and

promptly

notify

Electric

Sales

Office

injury

damage

resulting

from

rough

file

damage

claim

once

with

the

nearest

General

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

nor

the

adjustments

disturbed

the

relays

are

not

installed

immediately

they

should

stored

their

original

cartons

place

that

free

from

moisture

dust

and

metallic

chips

Foreign

matter

collected

the

outside

the

case

may

find

its

way

inside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay

INSPECTION

AND

ACCEPTANCE

TEST

should

made

make

sure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

the

examination

test

indicates

that

readjustment

necessary

refer

the

section

SERVICING

These

tests

may

performed

part

the

installation

acceptance

tests

the

discretion

the

user

operating

companies

use

different

procedures

for

acceptance

and

for

installation

tests

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays

Since

most

VISUAL

INSPECTION

Check

the

nameplate

stamping

make

sure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition

Remove

the

relay

from

its

case

and

check

that

there

are

broken

cracked

molded

parts

other

signs

physical

damage

and

that

all

the

screws

are

tight

MECHANICAL

INSPECTION

There

should

noticeable

friction

when

the

disk

rotated

slowly

clockwise

The

disk

should

return

itself

its

rest

position

Make

sure

the

control

spring

not

deformed

nor

its

convolutions

tangled

touching

The

armature

and

contacts

the

seal

unit

well

the

armature

and

contacts

the

instantaneous

unit

should

move

freely

when

operated

hand

;

there

should

least

wipe

the

seal

contacts

The

targets

the

seal

unit

and

the

instantaneous

unit

must

come

into

view

and

latch

when

the

armatures

are

operated

hand

and

should

unlatch

when

the

target

release

lever

operated

Courtesy of NationalSwitchgear.com

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