GE IAC User manual

GEK

86054

INSTRUCTIONS

TYPE

IAC

TIME

OVERCURRENT

RELAYS

TYPES

IAC

•

[

•

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

86054

CONTENTS

PAGE

DESCRIPTION

APPLICATION

RATINGS

INDUCTION

UNIT

STANDARD

INSTANTANEOUS

UNIT

CHARACTERISTICS

INDUCTION

UNIT

STANDARD

INSTANTANEOUS

UNIT

CONSTRUCTION

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

ELECTRICAL

TESTS

DRAWOUT

RELAYS

GENERAL

POWER

REQUIREMENTS

GENERAL

TIME

OVERCURRENT

UNIT

Time

Setting

Pickup

Test

Time

Test

INSTANTANEOUS

UNIT

Setting

the

Instantaneous

Unit

Pickup

Test

TARGET

AND

SEAL

UNIT

Pickup

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

Pickup

Tests

Time

Tests

INSTANTANEOUS

UNIT

TARGET

AND

SEAL

UNIT

RENEWAL

PARTS

LIST

FIGURES

Courtesy of NationalSwitchgear.com

GEK

86054

TIME

OVERCURRENT

RELAYS

TYPES

IAC

DESCRIPTION

long

time

induction

overcurrent

unit

The

relays

contain

three

units

instantaneous

overcurrent

unit

and

target

and

seal

unit

APPLICATION

The

IAC

and

relays

are

used

protect

motor

against

two

abnormal

conditions

The

time

induction

overcurrent

unit

(

TOC

)

protects

against

motor

overloads

The

unit

has

long

time

inverse

characteristic

which

designed

coordinate

with

the

motor

heating

characteristic

coordination

insure

against

false

tripping

motor

starting

currents

and

yet

still

provide

adequate

protection

against

motor

overloads

The

usual

setting

for

pickup

125

150

the

motor

rating

The

instantaneous

overcurrent

unit

(

)

provides

fault

protection

pickup

this

unit

must

set

higher

than

the

maximum

momentary

motor

inrush

current

with

adequate

margin

such

Typical

pickup

settings

for

the

two

overcurrent

units

are

below

Application

requires

The

TABLE

PICKUP

SETTING

(

MULTIPLES

MOTOR

FULL

LOAD

CURRENT

)

UNIT

1.15

1.4

TOC

Time

overcurrent

unit

Normal

Dropout

Instanta

neous

Overcurrent

Unit

The

IAC

relay

similar

the

IAC

and

IAC

relays

except

that

the

time

unit

and

instantaneous

unit

contacts

are

brought

out

separately

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

86054

The

internal

connections

are

TABLE

Drawing

Figure

Relay

6209658

0257

8339

6209961

0285

6667

6375694

0285

6747

IAC

Forms

and

IAC

Forms

and

IAC

Forms

and

The

outline

and

panel

drilling

dimensions

are

shown

Figure

RATINGS

INDUCTION

UNIT

The

induction

unit

coll

available

several

ranges

pickup

current

Table

III

lists

ranges

tap

values

continuous

current

ratings

and

short

time

current

ratings

the

induction

unit

coil

The

induction

unit

contacts

will

amperes

for

voltages

not

exceeding

250

volts

The

current

carrying

ratings

are

affected

the

tap

selected

the

target

and

seal

coll

Indicated

Table

the

tripping

current

exceeds

amperes

use

auxiliary

relay

that

connected

such

that

the

tripping

current

does

not

pass

through

either

the

contacts

the

target

and

seal

coils

the

protective

relay

TABLE

III

INDUCTION

UNIT

COIL

RATINGS

(

FORMS

AND

)

SHORT

TIME

(

ONE

SECOND

)

RATING

(

AMPS

)

CONTINUOUS

CURRENT

(

AMPS

)

PICKUP

RANGE

(

AMPS

)

TAP

VALUES

(

AMPS

)

0.6

0.8

1.0

1.2

1.4

1.6

0.6

1.8

200

1.5

2.5

3.5

4.5

1.5

4.5

300

2.5

3.5

7.5

2.5

7.5

400

4.0

Two

taps

are

required

select

pickup

for

IAC

relays

having

forms

and

The

two

taps

required

for

the

values

shown

Table

III

are

(

from

the

lowest

highest

pickup

)

and

respectively

labelled

Courtesy of NationalSwitchgear.com

GEK

86054

obtain

tap

value

4.0

amps

the

2.5

7.5

amp

relay

use

taps

the

tap

block

TABLE

RATINGS

TARGET

AND

SEAL

COIL

DUAL

RATED

2.0

AMP

0.2

AMP

TAP

2.0

AMP

TAP

CURRENT

OPERATED

(

seconds

)

(

seconds

)

(

amperes

)

(

amperes

)

(

amperes

)

(

ohms

)

(

ohms

)

(

ohms

)

Carry

amps

for

Carry

amps

for

Carry

continuously

Minimum

operating

Minimum

dropout

resistance

hertz

impedance

hertz

impedance

2.2

0.05

0.45

2.0

0.37

2.3

2.0

0.2

0.05

0.5

8.3

0.24

0.65

0.54

STANDARD

INSTANTANEOUS

UNIT

Table

lists

the

The

instantaneous

unit

designed

use

one

several

coils

pickup

range

continuous

current

ratings

and

short

time

rating

each

these

coils

for

forms

through

TABLE

STANDARD

INSTANTANEOUS

UNIT

COIL

RATINGS

CONTINUOUS

CURRENT

(

AMPS

)

SHORT

TIME

(

ONE

SECOND

)

RATING

(

AMPS

)

PICKUP

RANGE

(

AMPS

)

0.5

0.75

1.5

3.0

127

6.0

15.0

205

326

30.0

326

160

60.0

Courtesy of NationalSwitchgear.com

GEK

86054

For

forms

and

the

standard

instantaneous

unit

has

the

following

ratings

listed

Table

TABLE

STANDARD

INSTANTANEOUS

UNIT

COIL

RATINGS

FORMS

AND

CfTDTCC

flD

PARALLEL

CONTINUOUS

RATINGS

ONE

SECOND

RANGE

Series

Parallel

0.75

25.0

0.5

1.0

2.0

0.5

4.0

1.5

4.0

50.0

130.0

260.0

3.0

2.0

16.0

8.0

Series

Parallel

2.0

4.0

6.0

16.0

15.0

10.0

80.0

10.0

20.0

Series

Parallel

400.0

600.0

40.0

25.0

80.0

600.0

20.0

160.0

Series

Parallel

25.0

20.0

40.0

160.0

80.0

25.0

Higher

currents

(

)

may

applied

for

shorter

lengths

time

(

)

accordance

with

the

formula

—

constant

The

current

closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts

CHARACTERISTICS

INDUCTION

UNIT

The

induction

unit

consists

conducting

disk

that

passes

through

the

poles

permanent

magnet

and

electromagnet

The

disk

free

rotate

with

vertically

suspended

shaft

but

restrained

one

direction

spring

When

energized

with

alternating

current

proper

magnitude

(

set

the

tap

position

)

the

electromagnet

produces

out

phase

fluxes

its

pole

faces

These

fluxes

interact

with

induced

currents

the

disk

produce

torque

the

disk

When

this

torque

exceeds

the

restraining

force

the

spring

the

disk

begins

rotate

speed

determined

the

magnetic

dragging

action

the

permanent

magnet

post

attached

the

rotating

shaft

travels

specific

distance

(

set

the

time

dial

)

and

makes

electrical

contact

with

fixed

member

Figure

gives

the

time

for

the

induction

unit

its

contacts

for

various

multiples

pickup

current

and

time

dial

settings

The

time

required

for

this

unit

reset

from

contact

closure

the

Number

time

dial

position

approximately

seconds

Burden

data

for

induction

unit

coils

listed

Table

VII

The

impedance

values

are

for

the

minimum

tap

The

impedance

for

other

taps

pickup

current

(

tap

Courtesy of NationalSwitchgear.com

GEK

86054

rating

)

varies

(

approximately

)

inversely

the

square

the

current

rating

following

equation

illustrates

this

The

Impedance

Any

Tap

Amps

Minimum

Tap

Amps

Impedance

Tap

Amps

Minimum

Tap

TABLE

VII

BURDENS

INDUCTION

UNIT

COILS

VOLT

AMPS

FIVE

AMPS

CALCULATED

FROM

INPUT

MINIMUM

PICKUP

(

PICKUP

RANGE

(

AMPS

FREQ

(

)

TAP

POWER

FACTOR

WATTS

1.0

3.0

118.4

15.2

0.13

98.6

12.7

0.13

1.5

4.5

1.5

52.5

6.7

0.13

1.5

43.7

5.6

0.13

2.5

7.5

2.5

18.8

2.5

0.13

2.5

15.7

2.1

0.13

4.0

7.4

0.95

0.13

6.2

0.79

0.13

For

forms

and

the

burden

the

induction

unit

shown

Table

VIII

TABLE

VIII

BURDENS

INDUCTION

UNIT

COILS

FORMS

AND

PICKUP

RANGE

(

AMPS

)

VOLT

AMPS

FIVE

AMPS

CALCULATED

FROM

INPUT

MINIMUM

PICKUP

(

FREQ

IMP

POWER

FACTOR

(

)

TAP

OHMS

0.6

1.8

0.6

110.75

4.43

0.32

0.33

0.6

48.0

1.92

1.5

4.5

1.5

17.75

0.71

0.35

1.5

11.5

0.46

0.37

2.5

7.5

2.5

6.75

0.27

0.44

2.5

5.75

0.23

0.47

4.0

4.48

0.18

0.52

0.47

4.0

4.05

0.16

Courtesy of NationalSwitchgear.com

GEK

86054

STANDARD

INSTANTANEOUS

UNIT

The

standard

instantaneous

unit

electromagnet

that

attracts

hinged

armature

when

sufficient

current

applied

contact

that

bridges

two

stationary

contacts

when

the

coil

energized

target

displayed

when

the

unit

operates

Pressing

the

button

the

lower

left

corner

the

relay

cover

resets

the

target

The

armature

carries

shaped

moving

The

pickup

range

can

adjusted

continuously

over

four

one

range

using

the

adjustable

pole

piece

When

the

top

the

core

lined

with

the

calibration

stampings

approximate

value

pickup

can

determined

Dropout

about

pickup

Figure

shows

the

variation

operating

time

with

applied

current

for

this

unit

Burden

data

the

standard

instantaneous

unit

tabulated

Table

TABLE

BURDEN

STANDARD

INSTANTANEOUS

UNIT

IMPEDANCE

(

OHMS

)

POWER

FACTOR

VOLT

AMPStt

FREQ

PICKUP

RANGE

(

AMPS

)

(

)

AMPS

12.4

310

0.84

0.5

13.2

0.78

330

0.77

3.75

0.71

100

4.0

0.77

0.94

0.71

1.0

0.23

0.77

5.8

0.71

6.2

0.25

0.77

0.9

0.04

0.71

1.0

0.04

0.01

0.77

0.23

0.71

0.01

0.25

0.71

0.003

0.07

160

0.71

0.07

Volt

amperes

amps

calculated

from

input

minimum

pickup

(

)

CONSTRUCTION

The

IAC

and

relays

are

mounted

case

(

that

does

not

have

upper

contact

block

)

The

case

suitable

for

either

semi

flush

surface

mounting

panels

two

inches

thick

Hardware

available

for

all

panel

thicknesses

sure

that

the

proper

hardware

will

provided

panel

thickness

should

specified

the

order

for

the

relay

Outline

and

panel

drilling

dimensions

are

shown

Figure

Courtesy of NationalSwitchgear.com

GEK

86054

The

relay

components

are

mounted

cradle

assembly

that

can

easily

removed

from

the

relay

case

The

cradle

locked

the

case

latches

the

top

and

bottom

Electrical

connections

between

case

and

cradle

blocks

are

completed

through

removable

connection

plugs

Separate

testing

plugs

can

inserted

place

the

connection

plugs

test

the

relay

its

case

The

cover

attached

the

case

from

the

front

and

includes

interlock

arm

that

prevents

the

cover

from

being

replaced

until

the

connection

plug

has

been

inserted

The

induction

unit

consisting

magnet

drag

magnet

and

disk

assembly

mounted

metal

frame

The

pickup

the

induction

unit

set

tap

block

located

near

the

top

the

relay

The

time

delay

adjusted

turning

the

molded

time

dial

located

just

below

the

tap

block

The

standard

instantaneous

unit

mounted

just

above

the

drag

magnet

the

right

hand

side

The

adjustable

core

can

raised

lowered

change

the

pickup

the

unit

The

unit

just

above

the

drag

magnet

the

left

target

seal

unit

for

the

induction

unit

This

seal

unit

does

not

have

adjustable

core

but

tap

screws

located

the

right

side

the

unit

can

used

change

pickup

Relay

construction

illustrated

Figures

and

RECEIVING

HANDLING

AND

STORAGE

This

relay

when

not

included

part

control

panel

will

shipped

carton

designed

protect

against

damage

Upon

receipt

immediately

examine

the

relay

for

any

damage

sustained

transit

evident

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Sales

Office

the

equipment

not

installed

immediately

should

stored

indoors

location

that

dry

and

protected

from

dust

metallic

chips

and

severe

atmospheric

contaminants

damage

from

rough

handling

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

that

readjustment

necessary

refer

the

section

SERVICING

These

tests

may

performed

part

the

installation

acceptance

tests

the

discretion

the

user

the

examination

test

indicates

Since

most

operating

companies

use

different

procedures

for

acceptance

and

for

installation

tests

the

following

section

includes

all

applicable

tests

that

may

performed

these

relays

VISUAL

INSPECTION

Check

the

nameplate

stamping

make

sure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition

Courtesy of NationalSwitchgear.com

GEK

86054

Remove

the

relay

from

its

case

and

check

that

there

are

broken

cracked

molded

parts

other

signs

physical

damage

and

that

all

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

Make

sure

that

the

fingers

and

shorting

bars

agree

with

the

internal

connections

diagram

CAUTION

Every

circuit

the

drawout

case

has

auxiliary

brush

especially

important

current

circuits

and

other

circuits

with

shorting

bars

that

the

auxiliary

brush

bent

high

enough

engage

the

connecting

plug

test

plug

before

the

main

brushes

This

will

prevent

Current

Transformer

(

)

secondary

circuits

from

being

opened

See

Figure

ELECTRICAL

TESTS

DRAWOUT

RELAYS

GENERAL

Since

all

drawout

relays

service

operate

their

cases

recommended

that

they

tested

their

cases

equivalent

steel

case

this

way

any

magnetic

effects

the

enclosure

will

accurately

duplicated

during

testing

relay

may

tested

without

removing

from

the

panel

using

XLA

test

plug

This

plug

makes

connections

only

with

the

relay

and

does

not

disturb

any

shorting

bars

the

case

The

XLA

test

plug

may

also

used

Although

this

test

plug

allows

greater

testing

flexibility

requires

shorting

jumpers

and

the

exercise

greater

care

since

connections

are

made

both

the

relay

and

the

external

circuitry

POWER

REQUIREMENTS

GENERAL

All

devices

operating

alternating

current

(

)

are

affected

frequency

Since

non

sinusoidal

waveforms

can

analyzed

fundamental

frequency

plus

harmonics

that

fundamental

frequency

follows

that

alternating

current

devices

(

relays

)

will

affected

applied

waveforms

relays

(

and

devices

general

)

are

significantly

affected

the

application

non

sinusoidal

waveforms

Courtesy of NationalSwitchgear.com

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