GE IAC60T Manuale utente

ION

GEK-65573

TIME

OVERCURRENT

RELAYS

IAC6OT,

IAC8OT,

IAC9OT

GENERAL

ELECTRIC

GEK-65573

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CONSTRUCTION

RATINGS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

AUXILIARY

UNIT

CONTACTS

BURDENS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

AUXILIARY

UNIT

CHARACTERISTICS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

RECEIVING,

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

OVERCURRENT

UNIT

CAUTION

DRAWOUT

RELAY

TESTING

POWER

REQUIREMENTS

GENERAL

TIME

OVERCURRENT

UNIT

TIME

SETTING

PICKUP

TEST

TIME

TEST 13

INSTANTANEOUS

UNiT

PICKUP

AND

RESET

AUXILIARY

UNIT

INSTALLATION

TESTS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

AUXILIARY

UNIT 14

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

AUXILIARY

UNIT

CONTACT

CLEANING

SYSTEM

TEST

SERVICING

MECHANICAL

ADJUSTMENTS 16

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

ELECTRICAL

ADJUSTMENTS

TIME

OVERCURRENT

UNIT

INSTANTANEOUS

UNIT

RENEWAL

PARTS

LIST

FIGURES

GEK—65573

TIME

OVERCLJRRENT

RELAYS

IAC6OT, IAC8OT,

IAC9OT

DESCR

IPTION

The

IAC0T,

IAC8OT

and

IAC9OT

relays

consist

two

induction

disk

timer

overcurrent

units

with

wound

shading

coils

for

torque

control,

two

plunger-type

instantaneous

overcurrent

units

and one

auxiliary

unit,

all

mounted in

the

size

drawout

case.

The

three

models

differ

only

the

characteristic

the

time

overcurrent

unit,

which

inverse

the

IAC6OT,

very

inverse

the

IAC8OT

and

extremely

inverse

the

IAC9OT.

The

relays

not

include

tarciet

seal-in

unit

since

this

feature

provided

the

associated

distance

relays.

The

time

overcurrent

units

are

adjustable

over

range

the

instantaneous

units

have

adjustment

range

The

available

ranges

amperes

both

the

time

and

instantaneous

units,

well

information

their

continuous

and

short

time

ratings,

are

provided

the

section

RATINGS.

The

outline

and

mounting

dimensions

the

size

drawout

case

are

shown

Fig.

15.

APPI

ICAT

ION

The

IAC6OT,

I1C80T

and

IAC9OT

relays

are

specifically

designed

for

use in

conjunction

with

two

zones

step—distance

relays.

this

application

the

contacts

the

instantaneous

overcurrent

units

are

connected

supervise

the

first

zone

distance

relay

trip

circuit

prevent

incorrect

tripping

loss

the

potential

supply.

The

time

overcurrent

units

are

torque

controlled

by means

wound

shading

coils

and

contacts

the

auxiliary

unit.

The

second

zone

distance

relays

operate

the

auxiliary unit,

which

turn

completes

the

wound

shading

coil

circuit.

Subsequent

operation

the

time

overcurrent

units

provides

the

second

zone

time-delay

tripping.

This

arrangement

provides

the

means

for

obtaining

coordination

between

second

zone

tripping

and

overcurrent

relays

fuses

installed

tapped loads

the

line.

the

same

time

the

scheme

provides

definite

second

zone

reach

for

the

overall

line

protection

and

backup.

The

elementary

diagram

Fig.

illustrates

how

any one

the

three

IAC

relays

covered

this

instruction

book

may

used

conjunction

with

the

CEV51A

and

CEY52A

mho-type

distance

relays

provide

two—zone

protection

against

multi—phase

faults.

The

CEY51A

first-zone

directional

mho

relay

that

trips

without

time

delay

through

contacts

the

instantaneous

units

the

IAC

relay.

The

CEY52A

the

second

zone

directional

mho

relay

that

operates

the

auxiliary

unit

the

JAC

relay

torque

control

the

time

overcurrent

unit.

The

time

overcurrent

unit

trips

the breaker via

the

CEY52A

contacts.

These

ntructiuns

not

purport

cover

all

details

variations

equipment

nor

provide

for

cvii-y

pcesibZ

contingency

met

cnneetion

with

installation,

operation

,rintenance.

Should

turthe

information

desi red or

houid

partJ

cular

problerro

arise

which

arm

not

covered

sufficiently

for

the

our

chaser’s

purposos, the

mat

ter

ullauirt

referred

the

General

Tiectric

Company.

•

the

xtcnt

required

the

urnjucts

descrl,ed

herein

r,ieet

applicable

aSsr.

1555

and

NEM4

standards;

hat

such

rssuranee

yen

respet

lonol

codes

and

ordinances

because they

vary

greatly.

GEK-65573

important

note

that

the

instantaneous

overcurrent

units

the

IAC

relays

are

not

designed

for

continuous

operation

the picked-up

position.

For

this

reason

these

units

must

set

above

the

maximum

expected

full

load

current.

However,

the

contacts

these

units

are

connected to

supervise

the

first

zone

CEY51A

contacts,

obvious

that

they

must

operate

reliably

the

minimum

internal

line

fault

current.

The

range

and

characteristics

the

time

overcurrent

units

must

selected

accomodate

the

desired

pickup

setting

and

the

same

time

permit

time

coordination

with

fuses

and

relays

other

points

the

system.

The

scheme

shown

Fig.

provides

protection against

multi—phase

faults.

Separate

ground

relays

must

used

for

protection

against

single-phase-to—ground

faults.

CONSTRUCTION

The

inverse

and

very

inverse

time

overcurrent

units

consist

tapped

current

operating

coil

wound

U—magnet

iron

structure.

The

several

taps

the

operating

coil

are

connected

tap

points

tap

block

to provide

ready

means

selecting

the

pickup

point.

The

U-magnet

includes

wound

shadinci

coils

which

are

connected

contact

the

auxiliary

unit

“A.”

The

extremely

inverse

time

overcurrent

unit

the

watt-metric

type.

The

upper

portion

the

iron

structure

has

two

concentric

windings

the

middle

leg

the

magnetic

circuit.

One

these

tapped

operating

current

winding

connected

tap

points

tap

block.

The

other

floating

winding

which

connected

series

with

resistor

(and

capacitor

the

extremely

inverse

units)

and

the

two

coils

the

lower

legs

the

magnetic

circuit.

This

floating

circuit

connected

contact

the

auxiliary

unit

hA.H

both

types

time

overcurrent

units

the

disk

and

shaft

assembly

carry

the

moving

contact

which

completes

the

trip

circuit

when

touches

the

stationary

contact.

The

shaft

restrained

spiral

spring

give

the

proper

contact closing

current

depending

tap

setting,

and

its

motion

retarded

Plnico

drag macnet,

which

acts

the

disk

produce

the

desired

time

characteristic.

The

lower

bearing

for

the

shaft

assembly

consists

polished

driven

into

the

shaft

and

riding

sapphire

jewel,

spring

mounted

screw-type

assembly.

The

upper

bearing

consists

adjustable

pivot

assembly

mounted

the

frame

and

having

polished

which

projects

into

bronze guide

ring

located

the

top

the

shaft.

The

variable

retarding

force

resulting

from

the

gradient

the

spiral

spring

compensated

the

spiral

shape

the

induction

disk.

This

results

increased

driving force

the

spring

winds

up.

calibrated

time

dial

determines the

distance

travel

the

moving

contact,

thus

controlling

the

pickup

time.

Each

the

instantaneous

overcurrent

units

the

plunger-type

construction.

The

adjustable

armature

mounted

the

threaded

portion

plunger

rod

which

carries

the

moving

contacts

upward

the

armature

operated.

The

armature

drawn

upward

into

the

coil

the

flux created

the

rectangular

magnet

frame

and

cylindrical

pole

piece

inside

the

coil.

Guides

for

the

plunger

rod

are

provided

the

GEK—65573

top

hole

the

pole

piece,

and

the

bottom

the

fit

the

molded

contact

carrier

inside

the

calibration

Lube.

Openings

the

sides

the

calibration

tube

allow

access

the

armature

adjust

pickup.

The

auxiliary

unit

‘A”

telephone—type

relay.

The

construction

typical

telephone-type

relay

shown

Fig.

11.

The

components

each

relay

are

mounted

cradle

assembly

which

can

easily

removed from

the

relay

case.

The

cradle

locked

the

case

means

latches

the

top

and

bottom.

The

electrical

connections

between

the

case

blocks

and

cradle

blocks

are

completed

through

removable

connection

plugs.

Separate

testing

plugs

can

inserted

place

the

connection

plugs

permit

testing

the

relay

its

case.

The

cover

attached

the

case

from

the

front

and

includes

interlock

arm

which

prevents

the

cover

from

being

replaced

until

the

connection

plug

has

been

inserted.

RATINGS

TIME

OVERCURRENT

UNIT

Ratings

the

time

overcurrent

unit

are

given

Table

TABLE

PICKUP

RANGE, AMPERES

FREQUENCY

MAIN

(TIME)

INSTANTANEOUS

RELAY

CYCLES

UNIT

0.5

4.0

IAC6OT

2.0

16.0

________

2—50

IAC8OT

0.5

4.0

IAC9OT

1.5

12.0

Available

taps

for

time

overcurrent

units

are

shown

Table

TABLE

RANGE

AMPERES

TAPS

AVAILABLE

(AMPERES)

0.5

4.0

0.5,

0.6, 0.7, 0.8,

1.0,

1.?,

1.5, 2.0, 2.5, 3.0,

4.0

1.5

—

1.5,

2.0,

2.5, 3.0,

4.0,

5.0,

6.0, 7.0,

8.0,

10.0,

12.0

2.0

2.0,

2.5,

3.0, 4.0,

5.0,

6.0, 7.0,

8.0,

10.0,

12.0,

16.0

SEK-65573

The

one—second

thermal

ratinqs

are

listed

Table

III

TABLE

III

RELAY

RANGE

ONE-SECOND

MODEL

(AMPS)

RATING

(AMPS)

IAC6OT

0.5

260

0.5

140

IAC8OT

1.5-12

260

0.5

125

IAC9OT

1.5

260

For

ratings

less

than

one

second,

the

rating

may

calculated

according

the

formula

=./i,

where

the

time

seconds

that

the

current

flows.

The

continuous

ratings

for

the

various

taps

of each

model and

current

range

are

given

Tables

IV,

and

VI.

CONTINUOUS

0.5

4.0

AMP

RANGE

TABLE

RATING

0.5

4.0

AMP

TOC

UNITS

MODEL

TAP

0.5 0.6

0.7

0.8

1.0

1.2

1.5

2.0

2.5

3.01

4.0

IAC6OT

1.6

1.8

2.0

2.1

2.3 2.7

3.0

3.5

4.0

4.5

5.0

IAC8OT

4.0

4.5 5.5

5.5 6.0

7.0

7.5

9.0

10.0

11.0

13.0

IAC9OT

3.5

3.7

4.0

4.5 5.0

5.5

6.0

7.0

8.0

9.0

10.0

GEK—65573

TABLE

CONTINUOUS

RATING

1.5-

12.0

AMP

TOC

UNITS

1.5

-1?.O

AMU

RANGE

MODEL

TAP

1.5

2.0

2.5

3.0

4.0 5.0

6.0

7.0

8.0

10.0

12.0

IACBOT

RATING

10.0

11.5

13.0

14.5 17.0

19.0

21.0

23.0

23.5

27.5

30.5

(AMPS)

IAC9OT

9.5

10.5

11.5

12.5

14.0

15.5

17.0 18.0 19.0

20.0

TABLE

CONTINUOUS

RATING

OF 2

16.0

AMP

TOC

UNITS

16.0

AMP

RANGE

MODEL

TAP

2.0 2.5

3.0

4.0

5.0 6.0

7.0

8.0

10.0

12.0

16.0

RATING

IAC60(AMps)

8.0

9.0

10.0

12.0 14.0 15.0 16.0

17.5

20.0 20.0

20.O

INSTANTANEOUS

OVERCURRENT

UNIT

These

coils

are

suitable

for

and

frequencies

from

hertz.

The

coils

are

rated

for

five

amperes

continuous

and

have

one-second

rating

260

amperes.

The

instantaneous

unit

has

range

amperes.

Tap

settings

are

made

per

Table

VII

TABLE

VII

Topof

Relay

LINK

POSITIONS

12.5

Pickup

3.?

Amperes

12.5

31.3

(Calibration

Marks)

j__________________________

GEK-65573

AUXILIARY

UNIT

The

auxiliary

unit

“A”

has

dual

voltaqe

rating

48/125

volts.

CONTACTS

The

contacts

both

the

time

overcurrent

and

instantaneous

units

will

and

carry

amperes

momentarily

for

tripping

duty

control voltages

250

less.

The

breaker

trip

coil

circuit

should,

however,

always

opened

circuit

breaker

auxiliary

switch

other

suitable

means.

the

tripping

current

exceeds

amperes,

auxiliary

tripping

relay

should

used.

(JR

DENS

TIME

OVERCURRENT

UNIT

Burdens

for

the

inverse

time

overcurrent

unit

(IAC6OT)

are

given

Table

VIII.

TABLE

VIII

BURDENS

MIN.

BURDENS IN

AMPS

PICKUP MIN.

TAP

OHMS

(7)

CALCULATED

FROM

10 20

IMPEDANCE

MIN. TIMES TIMES TIMES

MINIMUM

PICKUP

RANGE

TAP

PICKUP PICKUP

PICKUP

(127)

0.5-

4.0

0.5

5.60

21.0 22.0

10.80

5.00

3.66

550.0

.O-16.O

2.0

0.37

1.44 1.45

0.65

0.32 0.24

36.3

NOTE:

The

impedance

values

given

are

those

for

the

minimum

tap

each

relay.

The

impedance

for

other

taps

pickup

current

(tap

rating)

varies inversely

(approximately)

the square

the

tap

rating.

For

example,

for

relay

with

0.5-4.0

amp

range,

the

impedance

the

0.5

ohm

tap is

given

22.0

ohms. The

impedance

the

2.0

amp

tap

2.0

amperes

(0.5/2)2

1.37

ohms.

Burdens

for

the

very

inverse

time

overcurrent

unit

(IAC8OT)

are

given

Table

IX.

TABLE

BURDENS

MIN.

BURDENS

AMPS

PICKUP_MIN.

TAP

OHMS

(7)

CALCULATED

FROM

IMPEDANCE

MIN.

TIMES

TIMES TIMES

MINIMUM

PICKUP

RANGE

TAP

PICKUP PICKUP

PICKUP

(12Z)

0.5-

4.0

0.5

1.40

3.90

4.15

4.20

2.90

2.20

104.0

1.5—12.0

1.5

0.23

0.53 0.58

0.58

0.36

O.?8

14.5

____

The

impedance

values

given

are

those

for

the

minimum

tap

each

relay.

The

impedance

for

other taps

pickup

current

(tap

rating)

varies

inversely

(approximately)

the square

the

tap

rating.

For

example,

for

relay

with

0.5-4.0

amp

ranqe,

the

impedance

the

0.5

ohm

tap

given

4.15

ohms.

The

rnpedance

the

2.0

amp

tap

at 2.0

amperes

(0.5/2)2

4.15

0.26

ohm.

Burdens

for

the

extremely

inverse

time

overcurrent

unit

(IAC9OT)

are

given

Table

TABLE

BURDENS

MIN.

BURDENS

AMPS

PICKUP

MIN.

TAP

OHMS

(Z)

CALCULATED

FROM

IMPEDANCE

M1N.

TIMES

MINIMUM

PICKUP

RANGE

TAP

PICKUP

0.5-

4.0

0.5

0.80

1.38

1.60

1.5-12.0

1.5

0.085

0.147

0.17

0.17 0.17 4.25

The

impedance

values

given

are those

for

the

minimum

tap

each

relay.

The

impedance

for

other

taps

pickup

current

(tap

rating)

varies

inversely

(approximately)

the

square

the tap

rating.

For

example,

for

relay

with

0.5-4.0

amp

range,

the

impedance

the

0.5

ohm

tap

given

1.60

ohms.

The

impedance

the

2.0

amp

tap

2.0

amperes

(0.5/2)2

1.60

0.10

ohm.

The

auxiliary

unit

milliamperes

VDC.

battery

drain

35.7

coil

has

resistance

2500

ohms

and

battery

drain

1.92

1000

ohm

series

resistor

added

for

125

VDC

operation

with

milliamperes.

GEK—65573

NOTE:

INSTANTANEOUS

OVERCURRENT

UNIT

Burdens

for

the

instantaneous overcurrent

unit

are

given

Table

IX.

TABLE

AUXILIARY

UNIT

GEK-65573

CHARACTERISTICS

TIME

OVERCURRENT

UNIT

Pickup

the

time

overcurrent

unit

defined

the

current

required

the

contacts

from

the

0.5

time-dial

position.

The

pickup

value

within

three

percent

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

10,

the

disk

must

travel

the

maximum

distance

the

contacts;

this

gives

the

maximum

time

setting.

The

percentage

the

minimum

closing

value

current

that

the

unit

will

reset

is:

IAC6OT

percent

IAC8OT

percent

IAC9OT

percent

The

time

reset

the

Number

time-dial

position,

when

the

current

reduced

zero,

approximately:

IAC6OT

seconds

IAC8OT

seconds

IAC9OT

seconds

The

time-current

characteristics

are

shown

Fig.

and

for

the

IAC6OT,

IAC8OT

and

IAC9OT,

respectively.

INSTANTANEOUS

OVERCURRENT

UNIT

The

instantaneous

overcurrent

unit is

continuously

adjustable

over

25:1

range.

Pickup

set

adjusting

the

vertical

position

the

armature

relative

the

markings

the

calibration

tube.

The

instantaneous

unit

will

reset

the

de—

energized

position

between

and

percent

its

pickup

setting.

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

sustained

transit.

If injury

damage

resulting

from

rough

handling

evident,

file

damage

claim

once

with

the

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office.

Reasonable

care

should

exercised

unpacking

the

relay

order

that

none

the

parts

are

injured

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.

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