GE 12IAC8OL Manuale utente

INSTRUCTIONS

Insert

Booklet-

GEH-1788

TIME

OVERCURRENT

RELAY

TYPE

TAC

MODEL

12IAC8OL(-)A

INTRODUCTION

This

supplement

conjunction

with

GEH—1788

forms

the

instructions

for

relay

model

12IAC8OL(-)A.

DESCRIPTION

Relay

model

12IAC8OL(-)A

consists

single

IAC

type

time

overcurrent

unit

with

seal—in

unit

mounted

small

single

ended

(Si)

case.

This

relay

similar

model

121AC53A(-)A

described

GEK-1788

except:

The

internal

connections

are

shown

figure

this

supplement.

The

induction

unit

uses

wound

shading

coils

the

U-magnet

provide torque

control.

This

control

circuit

(connected

studs

and

must

completed

order

that

there

phase

displace

ment

flux

rotate

the

disk.

When

the

shading

coil

circuit

completed,

torque

can

developed

the

induction

disk

and

the

unit

will

operate

overcurrent.

When

the

shading

coil

circuit

open,

the

unit

will

not

operate

at current

levels

times

tap

value.

The

time

current

curves,

burdens

and

ratings

this

relay

are

given

GEH-1788

for

model

121AC53A(-)A.

Those

Instructions

not

purport

to cover

all

detafle

variation.

equip..nt

nor to

provide

for

every

possible

contingency

met in

connection

with

inatal3atioq,

operation

.aintenanc..

Should

further

information

desired

should

particular

probls

arise

which

are

not

covered

•ufficiently

for

the

purchaser’s

puro.ea,

the

matter

should

referred

the

General

Liectric

Company.

POWER

SYSTEMS

MANAGEMENT

DEPARTMENT

GENERAL•

ELECTRIC

GEK-

27870

SHORT

FINGERS

CONTROL

WINDINGS

FIG.

(0226A7211-0)

INTERNAL

COKNECTIONS

DIAGRAM FOR THE

IACBOL(-)A

RELAY

(FRONT

VIEW)

GENERAL

ELECTRIC

CO..

POWER

SYSTEMS

MANAGEMENT BUSINESS

DEPT.,

MALVERN,

PA.

19355

SEAL—IN

8-70

INSTRUCTIONS

GEH-1

788L

TYPES

TIME

OVERCURRENT

RELAYS

GENERAL

ELECTRIC

IAC53A

IAC53B

IAC53C

IAC54A

IAC54B

c’1

c..J

c..1

cS-i

LC)

C’,

C-,

GEH-1788

Tvne

IAC

Time

Overcurrent

Relay

TOP

PIVOT

TAP

PLUG

SEAL-IN

UNIT

HOLDING

(0I

SEAL-

TARGET

SEAL-IN

UNIT

STATIONARY

CONTACT,

S[AL

UNIT

STATIONARY

(.T

RIGHT

SEAL

MOVING

CON

TACT

3EMBLY

TAP

BLOCK

--TIMF

DIAL

DISK

SHAFT

MAIN

MOVING

CONTACT

STA’

IDNARY

ROUGH

AND

CONTACT

ASS

MAGNET

0151<

(ii

Si,p,

—

-‘p

‘4

Fiq.

The

Induction

Unit

for

Type

IAC

Relays

(Front

View)

DISK

AND

SHAFT

—

JEWEL

SCREW

Fin.

The

Induction

Unit

for

Type

IAC

Relays (Rear

View)

TIME

OVERCURRENT

RELAYS

TYPE

IAC

INTRODUCTION

The

Types

1AC53

and

1AC54

relays are

time

overcurrent

relays

with

very-inverse

time

char

acteristic.

They

are

employed

protect

against

overcurrent

single-phase

and

poly-phase

circuits.

The

various

relays

described

this

instruction

book

differ

the

number

circuits

they

close,

and

instantaneous

unit

and/or

a-c

tripping

unit

included.

These

relays

consist

induction unit

induction

unit

with

instantaneous

unit

which

per-

mits

instantaneous

tripping

for

exteremely

high

cur

rents,

induction

unitwithana-c

tripping

unit for

use

where

d-c

power

is unavailable or

a-c

tripping

preferred.

Since

practically

all

Type

IAC

relays

are

composed

various

combinations

the

above

(that

is,

the

induction

unit, the

instantaneous

unit

and the

a-c

tripping

unit),

they

are,

for convenience,

describ

separately

the

following

text.

The

above

table

indicates

the

units

comprising

each

type

and

also

lists

the

internal

connections

and

outline

andpanel

drilling

diagrams.

INDUCTION UNIT

INTRODUCTION

The

induction unit

the

basic

unit

all

Type

TAC

relays.

Figs.

and

show

the

induction

unit

mounted

the

cradle.

These

units

are

the

induc

tion-disk

construction

type.

Thediskisactuatedby

current

operating

coil

laminated

U-magnet.

The

disk

shaft

carries

the

moving

contact

which

completes

the

alarm

trip

circuit

when

touches

the

station

ary

contact or contacts.

The

disk

shaft

restrained

spiral

spring

give

the

proper

contact-closing

current

and

its

motion

retarded

permanent

magnet

acting

the

disk

give

the

correct

time

delay.

There

seal-in

unit

mounted

the

front

the

left

the

shaft.

This

unit

has

its

coil

series

and

its contacts

parallel

with the main

contacts

such

that

when

the main

contacts-close

the

seal-in

unit

picks

and

seals

in.

When

the

seal-in

unit

picks

up,

raises

target

into

view

which

latches

and

remains

exposed until

released

pressing

button

beneath

the

lower

left

corner

the

cover.

APPLICATION

The

induction unit

the

main

unit

all

Type

IAC

relays,

supplying

the

very

inverse

time

delay

characteristics

the

relay

and

soundingan

alarm

tripping

the

breakers

for overload

currents

which

cause

close its contacts.

OPERATING

CHARACTERISTICS

The

induction

unit

may

have

one

two

circuit-

closing

contacts

which

the

current increases

the

pick-up

value

set

the

tap

block.

The

time

delay

closing

the

contacts

determined

the

setting

the

time

dial

(Fig.

1).

The

time-cur

rent

characteristics

are

shown

Fig.

RATINGS

The

induction

unit

designed

use

any

one

four

operating

coils,

each

having

different

com

bination

taps

follows,

4,5,6,7,8,10,12,

and

amperes;

1.5,2.0,

2.5,

3.0, 4.0,

5.0

and

6.0

amperes;

0.5, 0.6,

0.8,

1.0,

1.2,

1.5

and

2.0

amperes;

0.1,

0.12,

0.16,

0.2,

0.24,

0.3

and

0.4

amperes.

Contact

Instan.

A-C

Trip

Induc.

Outline

mt.

ype

Circuits

Unit

&P.

Conn.

IAC53A(-)A

One

Fig.

IAC53B(-)A

One

Yes

One

Fig.

IAC53C(-)A

One

Yes

Fin.

Fig.

iAC53R(-)A

One

Yes

One

Fig.

IAC54A(-)A Two

One

Fig.

1AC54B(-)A

Two

Yes

One

‘Fig.

Fig.

Shove

instructions

not

purport

cover

al.!

details

variations

equipment

nor

provide

for

n’Jer

posszble

contingency to

met

connect

ion with

installation,

operation

rrintenance.

Should

rurt;2-O-

information

des;rcd

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

pur.:lianer

‘s

purposes,

the

matter

should

referred

the General

Electric

Company.

Civ

Cxtent

requlred

the

products

described herein

meet

applicable

ANSI,

IEEE

and

NEMA

standards;

but

such

ssura.nce

qiven

with

respect

local

codes

and

ordinances

because

they

vary

greatly.

GEH-1788

Type

[AC

Time

Overcurrent

Relay

:.;.;;

liii—

“I

II,

TIN

HIlt

API

lIST

UNIT

I,.

5-4

2—16

0-ITO

20-ISO

1F11Ii1II_

I_L

1IIII1

EXTQE[

r’(E

(ECO

r[p’)

TIIIE

061

TAPS

C.5,O.6,O.7,0.8,I.O,I.2,I.S,2.O,2..,3.0,4.0

5,2.0,2.5,3.

0,5.0,

S.O6

.0,7.0,6.0,

2.O,2.5,3.0,4.05.0,6.O,7,O,80.,IO.0,I2,I6

1I!11

17111

IJI

ADJ

INST.

UNIT

CON

NUOLISLY

AUJU

I..

‘7

Figure

(0888e0270

[3])

Time-Current

Curves

for

Type

IAC

Relays

with

Very-Inverse-Time

Characteristics

III

441,44744411!

•

0.5-4.0

1.5—12.0

2-16

‘I’

‘44

—

——

—

74fl

—

——-

I..

W7IWW

III

MULTIPLES

OF RELAY

TAP

SETTING

fiiiij

Type

IAC

Time

Overcurrent

Relay

GEH-1788

CALIBRATION

PLATE

ADJUSTABLE

I-.----

POLE PIECE

EDUS

UNIT

OPERATING

COIL

TARGET

STATIONARY

[

CONTACTS

MOVING

CONTACT

ASSEMBLY

CONTACTS

SHORTING

COIL

BURDENS

The

current-closing

rating

the

contacts

amperes

for

voltages

not

exceeding

250

volts.

The

current-carrying

ratings

are

affected

the

selection

the

tap

the

target

and

seal-in

coil

indicated

the

following

table:

Amperes, a-c

d-c

Function

2-Amp

Tap

0.2

Amp

Tap

Tripping

Duty

Carry

Continuously

0.3

Operating

Range

2-30

0.2-2

Resistance

0.13

Impedance

0.53

the

tripping

current

exceeds

amperes

aaxiliary

relay

should

used,

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

contacts

the

target

and

seal-in

coils

the

protective

relay.

Burdens

for

the

standard coils

are

given

the

following

table. These

are

calculated

burdens

five

amperes

based

burden

minimum

tap.

Volt-ampere

burdens

for

the

lowest

tap

any

the

three coils

can

determined

for

any

value

current,

times

tap

setting,

from

Fig.

Coil

Volt Imp.

Amps

Freq.

Tap

Amps

Amps Ohms

4-16

2.0

0.08

0.50

1.7

0.07

0.50

4 5

1.3

0.05

0.61

1.5-6

60 1.5

14.5

0.58

0.42

1.5

12.0

0.48

0.42

1.5

9.0

0.36

0.55

0.5-2

0.5

105.0

4.20

0.35

0.5

86.0

3.45

0.34

0.5

82.0 3.28

0.55

0.1

3050

122

0.38

0.1-0.4

5tJ

0.1

2546

102

0.36

INTRODUCTION

INSTANTANEOUS

UNIT

The

instantaneous

unit

small

instantaneous

hinge-type

unit

which

may

mounted

the

right

front

side

the

induction

unit

(See

Fig.

4).

Its

contacts

are

normally

connected

parallel

with

the

contacts

the

main

unit.

Its

coil

is connected

series

with the

operating

coil

the

main

unit.

When

the

current

reaches

predetermined

value,

the

instantaneous

unit

operates,

closing

the

contact

circuit

and

raising

its

target

into

view.

The

target

latches

the

exposed

position

until

released

pressing

the

button

beneath

the

lower

left-hand

corner

the

relay

cover.

1•-

C’4

C.,’

c..J

C.,’

MAIN

COIL

-C

TRIPPING

UNIT

U-

Fig.

Type

Relay

with

Instantaneous

Unit

(Front

View)

Fig.

Type

IAC

Relay

with

A—C

Trip

Unit

(Rear

View)

GEH-1788

Type

IAC

Time

Overcurrent

Relay

MULTIPLES

MINIMUM

SATURATION

CURVES

FOR

INDUCTION

UNITS

TYPE

IAC

RELAYS

PIC1(—UP

CURRENT

LOWEST

TAPS

VERY

INVERSE

Fig.

Saturation

Curves

for

Lowest

Taps

tre

Induction

Unit

Type

IAC

Re’ays

with

Very—Inverse-Time

Character

stics

;

/Ez

—--

iEEEEz

—--------

0r.,

5Q,,,

25.

50.-s.,

RANGE

0.5—2.0

AMPS.

TAP

RANGE

1.5—6.0

AMPS.

TAP

.RANGE

4—16

AMPS.

V..

‘a

U-

Type

IAC

Time

Overcurrent

Relay

(JEH-1788

0.030

0.025

0.015

010

0.005

Fig.

(K-6306872

[5).

Time-Current

Characteristics

for

Original

Instantaneous

Unit

$I94C

RATD

TMTIRJS

IJIT

Fig.

(0208A869

5-1)

Time-Current

Characteristics

for

the

Hi-G”

Unit

Cr,

—

OPERATING

TIME

—

c—

RANGE

FOR

ANY

PICKUP

SETTING

—

M.JLTIPLES

PICK—UP

aILTIPiF

PICOOP

GEH-1788

Type

IAC

Time

Overcurrent

Relay

APPLICATION

rhe

instantaneous

unit

used

certain

Type

IAC

relay

models

provide

instantaneous tripping

for

current

exceeding

predetermined

value.

OPERATING

CHARACTERISTICS

The

instantaneous

unit

operates

over

four—

to—one

range

and

has

its

calibration

stamped

scale

mounted

beside

the

adjustable

pole

piece.

Time—current

characteristics

are

shown

Fig.

for

the

instantaneous

unit

used

before

1977.

1977

the

instantaneous

unit

was

modified

make

have

higher

seismic

rating.

The

new

instantaneous

unit

can

identified

the

mark

ing

“Hi—C”

moulded

into

the

front

moulding

just

above

the

target

windows.

The

time—current

characteristic

for

the

“Hi—C”

unit

shown

Fig.

7B.

RATINGS

The

instantaneous

unit

designed

use

the

coils

listed

below;

Coil

Freq

Amp

Volt-

Imp.

P.F.

Amp

Ohms

0.5-2

360

14.4

0.74

1-4

3.6

0.77

2—8

22.5

0.90

0.83

8.0

0.32 0.83

4-16

5.63

0.225

0.87

4.77

0.191

0.87

3.93

0.157

0.88

2.37

0.095

0.88

7—28

1.88

0.067

0.88

10-40

0.83

0.033

0.95

0.80

0.032

0.95

0.68

0.027

0.98

20-80

0.20

0.008

0.95

0.20

0.008

0.95

0.18

0.007

0.98

A-C

TRIPPING

UNIT

INTRODUCTION

The

a-c

tripping

unit

aType

REA

relay

unit

designed

energize

circuit-breaker

trip

coil

from

its

associated

current

transformer

upon

the

operation

the

main

unit

the

Type

TAC

relay.

transfers

the

current

from

the

secondary

the

current

transformer

into

the

trip

coil

and

removes

the

current

from

the

trip

coilwhen

the

breaker

trips.

The

tripping

unit

mounted

the

rear

the

frame

opposite

the

tapped

operating

coil

the

duction unit

(see

Fig.

5).

The

operation

this

unit

illustrated

FIg.

11.

The

secondary

current

circulates

through the

Induction

unit

current

coil

and

the

main

coil

the

Type

REA

auxiliary

tripping

unit,

returning

through

the

Type

REA

contacts

to the

cur

rent

transformer.

Normally,

most

the flux

gener

ated

the

main

Type

REA

coil

passes

through

the

upper limb

the

magnetic

structure

and

holds

the

armature

firmly

against

this

limb.

When

the

contacts

the

induction unit

close,

the

shorting

coil

the

Type

REA

unit

short-circuited

and

current

flows

this

coil

transformer

action, causing

redis

tribution

flux

which

actuates

the

armature

and the

Type

REA

contacts.

The

opening

the

Type

REA

contacts

causes

the

secondary

current

flow

through

the

trip

coil

which

trips

the

breaker.

Indicates

revision

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