GE IJC51E User manual

GEK-65583B

INSTRUCTIONS

TYPE

IJC51E

CURRENT

BALANCE

RELAY

Meter

and

Control

205

Great

Valley

Parkway

Malvern,

19355-07

GEK—65583

CONTENTS

PAGE

DESCRIPTION

APPLICATION

RATINGS

CONTACTS

TARGET/SEAL-IN

UNIT

BURDENS

TARGET/SEAL-IN

UNIT

OPERATING

PRINCIPLES

CHARACTERISTICS

CONSTRUCTION

TESTS

DRAWOUT

RELAYS,

GENERAL

POWER

REQUIREMENTS,

GENERAL

TARGET/SEAL-IN

UNIT

TEST

INDUCTION

UNIT

RECEIVING,

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

CAUTION

INSTALLATION

PROCEDURE

LOCATION

MOUNTING

CONNECTIONS

ADJUSTMENTS

PERIODIC

CHECKS

AND

ROUTINE

NAINTENANCE 12

CONTACT

CLEANING

SERVICING

RENEWAL

PARTS

GEK—65583

TYPE

IJCS1E

CURRENT

BALANCE

RELAY

DESCRIPTION

The

Type

IJC5IE

current

balance

relay

consists

three mechanically-separate

but

electrically

interconnected

induction—disk

units

mounted

large

size,

single-end

drawout

case.

The

outline

and

panel

drilling

dimensions

for

the

Type

IFC51E

are

shown

Figure

13.

Each

unit

consists

disk

and

shaft

assembly

which

carries

the

moving

contact.

Each

disk

actuated

two

U-magnet

and

coil

assemblies,

the

operating

coil

the

left—hand

side

and

the

restraint

coil

the

right—hand

side

(front

view).

Each

disk

shaft

restrained

spiral

spring

which

holds

the

contact

open

when

the

relay

de-energized.

There

target

seal—in

unit

mounted

the

front

and

the

left

the

shaft

each

induction—disk

unit.

This

unit

has

its

coil

series

and

its

contacts

parallel

with

the

contacts

the

main

unit.

APPLICATION

The

Type

IJC51E

relay is

recommended

for

the

protection

three—phase

lines

and

machines

against

damage from

phase

unbalance

single—phase

operation.

The

relay

typically

applied

where

currents

the

three

phases

are

normally

balanced.

The

external

connection

Figure

illustrates

typical

application.

The

relay

compares

the

currents

each

phase

with

those

each

the

other

phases

Any

increase

current

the

protected

circuit,

regardless

magnitude,

will

not

cause

relay

operation

long

the

unbalance

does

not

exceed

the

slope

setting

the

relay,

115,

125,

135

150%.

When

fault

unbalance

occurs

the

machine

line,

and

causes

the

current

one

the

phases

exceed

that

the

others

than

the

slope

setting,

the

torque

produced

the

operating

coil

will

greater

than

that

the

restraint

coil,

and

the

relay

will

operate

trip

the

breaker.

The

IJC51E

relay

can

classified

relay

which

protects

against

discontinuity

balanced-phase

conditions,

rather

than

fault—protective

relay.

When

used

for

protection

against

single-phase

operation

machine,

must

have

time

setting

such

length

that

will

not

trip

the

machine

external

single-

phase

fault.

Such

time

delay

must

permit

selective

tripping

the

relays

protecting

the

faulted

circuit.

These

.1nstructons

purport

cover

412

deta1ls

vartions

equipnt

nor

provide

for

evert

possible

contingency

met

connection

..‘ith

installation,

operation

maintenance.

Should

further

informaton

desired

should

particuLar

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser’s

purposes,

the

matter

should

referred

the General

Electric

Cosçany.

the

extent required

the

products

described herein

meet

applicable

ANSI.

IFEE

and

NFF(4

standards;

bit

flO

Such

assurance

qiwer,

.‘ith

respect

local

codes and

ordinances

because

they vary

greatl!.

K—65

583

RATI

NGS

The

IJC51E

three-phase

relay

rated

amperes,

hertz,

with

minimum

pickup

ampere

with

zero

restraint

current.

There

are

four

slope

selections

available,

115, 125,

135

and

15O.

The

relay

has

three

target/seal—in

units,

one

per

phase,

rated

0.2/2.0

amperes.

The

induction-disk

units

and

target/seal—in

units

are

contained

large,

size,

drawout

case.

CONTACTS

The

main

unit

contacts

have

maximum

current-closing

rating

amperes

voltages

not

exceeding

250

volts

for

tripping

duty.

The

main

unit

contacts,

when

used

without

the

target/seal—in

unit

contact,

not

have

interrupting

rating;

therefore,

the

trip

current

must

interrupted

some

other

suitable

means.

TARGET/SEAL-IN

UNIT

The

target/seal-in

units

are

Hi-G

units

with

0.2

and

2.0

ampere

taps.

The

0.2

ampere

tap

can

used

for

trip

circuits

that

have

amperes

less

tripping

current.

The

2.0

ampere

tap

used

trip circuits

that

have

least

amperes

and

amperes

trip

current available

the

maximum

control

voltage.

the

tripping

current

exceeds

amperes,

auxiliary

relay

and

contact

must

used

carry

the

trip

current.

The

connections

should

made

that

the

trip

current

does

not

pass

through

the

IJC

contacts

seal-in

unit.

The

target

ratings

are

shown

Table

TABLE

TAPS

0.2

Amp

2.0

Amp

Resistance

(ohms)

8.30

0.24

Minimum

Operating

(amperes)

0.2

2.0

Carry

Continuously

(amperes)

0.37

2.3

Carry

amperes

(seconds)

0.05

2.2

Carry

amperes

(seconds)

0.45

Hertz

Impedance

(ohms)

0.65

BURDENS

The

burdens

imposed

the

current

transformers

the

operating

and

restraining

coils

are

listed

Table

II.

GEK—65583

TABLE

Amp

Operating

0.74 0.32

0.6?

0.32

0.50

0.279

0.335

0.30

0.225

0.39

Coil

Restraint

Coil

115%

Slope

0.99

0.358

0.868

0.325

0.636 0.310

0.40

0.366 0.283

0.50

125%

Slope

1.06 0.34

0.928 0.31

0.65

0.30

0.41

0.345

0.29

0.47

135%

Slope

1.20

0.33 1.05

0.30

0.716

0.29

0.448

0.345

0.292

0.474

150%

Slope 1.46

0.32

1.24

0.29

0.835

0.28

0.54

0.32

0.355

0.46

can

calculated

from

the

equation:

127

TARGET/SEAL-IN

UNIT

For

the

burdens

the

target/seal—in

units,

see

Table

OPERATING

PRINCIPLES

The

operating

and

restraining

units

consist

U—magnets

similar

those

used

time-overcurrent

relays.

The

operating

U-magnet

located

the

left

side of

the

relay,

front

view,

and

the

restraining

U-magnet

located

the

right

side,

front

view.

Torque

produced

phase

shifting

one

flux

away

from

the

other

use

shading

rings

one

half

the

U-magnet

pole

face;

the

other

half

unshaded.

The

operating

U-magnet

produces

torque

the

normally-open

contact,

while

the

restraining

U-magnet

produces

torque

open

the

contact.

The

relay

will

its

contact

when

the

restraining

quantity

some

percentage

plus

minus

tolerance

the

slope

tap

selected

the

tap

block.

There

built-in

time

delay

produced

the

permanent

Alnico

drag

magnet,

which

secured

the

shelf

the

unit

frame.

The

drag

magnet

can

either

moved

inward

outward

this

shelf

make

the

corresponding

time

delay

shorter

longer.

This

procedure

sets

the

time

delay

according

the time

curves

Figures

and

10.

CHARACTERISTI

The

relay

used

current-balance

detector

three-phase

system.

The

relay

will

operate

its

normally-open

contact

trip

breaker

when

the

unbalance

between

any

two

currents

the

three—phase

system

exceeds

the

slope tap

setting

and

its

tolerance.

GEK—65583

The

slope

characteristics

are

shown

Figures

through

These

are

typical

slope curves

obtained

from

actual

relay

tests.

The

factory

tested

relay,

received

the

customer,

should

operate

within

the

actual

slope

tap

setti

ng.

The

slope

characteristics

were

determined

using

the

test

circuit

shown

Figure

15.

the

relay

tested

with

the

connections

shown

the

external

connections

diagram,

Figure

14,

where

‘Restraint

leading

‘Operating

120°,

the

slope

characteristic

increases

drastically

the

higher

restraint

currents.

The

change,

for

example,

amperes

restraint

125%

slope,

tested

per

Figure

15,

will

increase

approximately

180%

slope

when

tested

with

leading

1200.

This

change

is of

consequence

because

the

relay

not

fault

relay

and

only

used

for

balanced-current

protection.

The

slopes

are

correct

within

the

tolerance

amperes

restraint

for the

1200

out-of-phase

currents.

The

operating

times

the

115%

slope

2.5

and

5.0

amperes

restraint

are

shown

Figures

and

10.

COtISTRUCTI

014

The

Type

IdC51E

relays

are

assembled

large

size,

single-end

(Li)

drawout

case

having

terminals

the

rear

for

external

connections.

The

electrical

connections

between

the

relay

units

and

the

case

studs

are

made

through

stationary

molded

inner

and

outer

blocks,

between

which

nests

removable

connecting

plug

complete

the

circuit.

The

outer

block

attached

the

case

has

the

studs

for

the

external

connections,

and

the

inner

blocks

have

the

terminals for

the

internal

connections.

Every

circuit

the

drawout

case

has

auxiliary

brush,

shown

Figure

ii,

provide

adequate

overlap

when

the

connecting

plug

withdrawn

inserted.

Some

circuits

are

equipped

with

shorting

bars

(see

internal

connections

Figure

12)

and

those

circuits,

especially

important

that

the

auxiliary

brushes

make

contact

(as

indicated

Figure

ii)

with

adequate

pressure

prevent

the

opening

important

interlocking

circuits.

The

relay

mechanism

mounted in

steel

framework

called

the

cradle,

and

complete

unit

with

all

leads

terminated

the

inner

blocks.

This

cradle

held

firmly

the

case

with

latch

both

top

and

bottom,

and

guide

the

back

the

case.

The

connecting

plug, besides

making

the

electrical

connections

between

the

respective

blocks

the

cradle

and

case,

also

locks

the

latch

place.

The

cover,

which

drawn

the

case

thumbscrews,

holds the

connecting

plug/s

place.

The

target

reset

mechanism

part

the

cover assembly.

The

relay

case

suitable

for

either

semi—flush

surface

mounting

all

panels

inches

thick

and

appropriate

hardware

available.

However,

panel

thickness

must

indicated

the

relay

order,

ensure

that

proper

hardware

will

included.

separate

testing

plug

can

inserted

place

the

connecting

plug

test

the

relay

place

the

panel,

either

from

its

own

source

current

and

voltage,

GEK-65583

from

other

sources.

desired,

the

relay

can

drawn

out

and

replaced

another

which

has

been

tested

the

laboratory.

Figures

and

show

the

relay

removed from

its

drawout

case

with

all

major

components

identified.

Symbols

used

identify

circuit

components

are

the

same

those

which

appear

the

internal

connection

diagram

Figure

14.

The

relay

includes

three

similar

subassembly

elements

called

induction

units,

mounted

the

front

the

cradle.

The

induction

unit

the

basic

unit

all

IJC

relays.

These

units

are

the

induction-disk

construction.

The

disk

actuated

current

operating

coil

assembled

laminated

U-magnet.

The

disk

shaft

carries

the

moving

contact,

which

completes the

alarm

trip

circuit

when

touches

the

stationary

contact.

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.

NOTE:

All

tests

must

performed

with

the

relay

its

case

equivalent

case.

TESTS

DRAWOUT

RELAYS,

GENERAL

Since

all

drawout

relays

service

operate

their

cases,

recommended

that

they

tested

their

cases

equivalent

steel

case.

this

manner,

any

magnetic

effects

the

enclosure

will

accurately

duplicated

during

testing.

relay

may

tested

without

removing

from

the

panel

using

12XLA13A

test

plug.

This

plug

makes

connections

only

with

the

relay

and

does

not

disturb

any

shorting

bars

the

case.

The

12XLA12A

test

plug

may

also

used.

Although

this

test

plug

allows

greater

testing

flexibility,

also

requires

shorting

jumpers

and

the

exercise

greater

care,

since

connections

are

made

both

the

relay

and

the

external

circuitry.

POWER

REQUIREMENTS,

GENERAL

All

alternating—current-operated

devices

are

affected

frequency.

Since

non

sinusoidal

waveforms

can

analyzed

fundamental

frequency

plus

harmonics

the

fundamental

frequency,

follows

that

alternating-current

devices

(relays)

will

affected

the

applied

waveform.

Therefore,

order

test

alternating-current

relays properly,

essential

use

sine

wave

current

and/or

voltage.

The

purity

the

sine

wave

(i.e.,

its

freedom

from

harmonics)

cannot

expressed

finite

number

for

any

GEK-65583

particular

relay;

however,

any

relay

using

tuned

circuits,

networks,

saturaling

electromagnets

(such

tiine—overcurrent

relays),

would

essentially

affected

non-sinusoidal

waveforms.

Similarly,

relays

requiring

control

power

should

tested

using

and

not

full

wave

rectified

power.

Unless

the

rectified

supply

well

filtered,

many

relays

will

not

operate

properly

due

dips

the

rectified

power.

Zener

diodes,

for

example,

can

turn

off

during

dips.

general

rule,

the

source

should

not

contain

than

ripple.

TARGET/SEAL-IN

UNIT

TEST

Set

DC-current

circuit

capable

controlling

the

current

over

range

0.02

3.0

amperes.

Connect

the

circuit

studs

and

the

IJC51E

relay.

Check

the

tap

that

the

target/seal-in

unit

in.

The

tap,

received

from

the

factory,

will

normally

the

2.0

ampere

tap

position.

Check

each

the

units

(top-middle-bottom)

separately

follows:

Reduce

the

current

approximately

zero

amperes. Place

jumper

from

stud

the

target/seal-in

current

tap used,

and

gradually

increase

the

current

until

the

target/seal—in

unit

picks

up.

This

should

occur

the

value

listed

Table

III.

Remove

the

jumper

and

note

that

the

contact

the

target/seal-in

unit

remains

closed.

Reduce

the

current

gradually

and

note

the

value

current

needed

drop

out

the

target/seal—in

contacts.

This

should

occur

listed

the

dropout

portion

Table

III.

The

target/seal-in

flag

should

remain

latched-in.

can

only

reset

with

the

reset

arm

located

the

left

side

the

unit.

TABLE

III

TARGET

PICKUP

DROPOUT

TAP

AMPERES

0.2

amp

0.120

0.195

0.060

higher

2.0

amps

1.20

—

1.95

0.60

higher

The

target

taps

are

located

the

right

tap

plate

(front

view)

and

are

clearly

marked.

There

should

only

one

screw

this

plate.

The

contact plate

the

left

side

the

target/seal-in

unit

should

have

two

screws.

One

screw

used to

hold

the

plate

place.

The

other

screw

used

when

the

target

tap

(right

side)

must

changed.

This

accomplished

taking

one

the

screws

from

the

left

plate

and

putting

into

the

alternate

tap

the

right

plate.

The

original

tap

screw

the

right

plate

then

can

removed

and

placed

the

left

plate.

This

procedure

ensures

that

the

mechanical

adjustments

the

right

plate

are

not

disturbed

when

the tap

screw

changed

the

other

tap

position.

GEK—5583

INDUCTION

UNIT

Pickup

The

relay

must

tested

its

own

case

equivalent

steel

case.

Connect

the

relay

shown

the

test

diagram

Figure

for

the

and

connections

only.

Set

the

time

dial

the

1/2

time

dial

position.

Apply

110%

the

pickup

current

listed

the

nameplate.

After

the

contact

makes,

reduce

the

current

slowly

until

the

contact

just

opens,

increase

the

current

slightly,

and

the

relay contact

should

just

make.

flickering

indicating

light

considered

contact

closure.

The

pickup

should

within

nominal,

and

can

adjusted

with the

control

spring sprocket

located

between

the

control

spring

and

moving

contact.

There

are

notches

the

sprocket

that

can

used

turn the

assembly

with

screw

driver.

Turning

the

sprocket

the

right

increases

the

pickup

value.

Turning

the

left

decreases

the pickup.

Reset

Remove

the

pickup

current.

Turn

the

time

dial

the

No.10

position.

Turn

the

disk

hand

the

normally-open

contacts.

Release

the

disk,

and

should

reset

the

stop

the

No.10

time

dial

position.

the

disk

stops

somewhere

its

travel,

look

for

excessive

friction,

parts

that

may

touching,

foreign

matter

the

drag

magnet

air

gap.

Time

Tests

Figure

the

operating-time

curve

with

zero-restraint

current.

Figure

is the

operating-time

curve with

2.5

and

5.0

amperes

restraint

current

with

the

relay

set

the

115%

slope

tap.

The

time—curve

settings

can

verified

using

the

connections

for

pickup

for

the

Figure

curve

and

the

slope connections

for

the

Figure

curve.

The

time

curve

can

varied

moving

the

drag

magnet

the

shelf

the

relay

unit

frame.

Moving

the

magnet

inwards

towards

the

disk

shaft

makes

the

time

faster;

moving

away

from

the

shaft

makes

the

time

longer.

not

move

the

magnet

outward

past

the

serrations

the

disk,

because

begins

loose

its

effectiveness

beyond

that

point.

Slope

Tests

Refer

to Table

and

Figure

15. Connect

the

relay

shown

Figure

15.

Set

the

slope

115%.

Set the

time

dial

the

1/2

time

dial

position.

Set

the

restraint

current

(IR);

then apply

the

operating

current

(10)

listed

Table

IV.

best

this

test

done

‘go

—

go”

basis

because the

magnitude

the

test

currents

will

overheat

the

units

and

lower

the

actual

slope

setting.

The

“go

go”

method

follows:

GEK-65

583

Set

the

restraint

current

(IR).

Apply

the

minimum

operating

current

(Is)

and

note

that

the

disk

does

not

move

the

direction

the

normally-open

contact.

Apply

the

maximum

operating

current

and

note

that

the

disk

moves

the

direction

the

normally-open

contact.

best

not

wait

for

contact

closure

the

higher

values

because

the

overheating

effect.

The

above

tests

can

also

performed

the

other

slope

taps

mentioned

above,

using

Table

for

the

and

values.

TABLE

OPERATING

CURRENT

RESTRAINT SLOPE

PERCENT

CURRENT

115

125 135

150

5.OA

5.4

6.1

5.9

6.6

6.4

7.1 7.15

7.85

8.OA

8.64

9.76

9.44

10.56

10.24

—

11.36

11.44

12.56

20.OA

21.6

24.4 23.6

26.4

25.6

28.4 28.6

31.4

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.

damage

due

rough

handling is

evident,

file

damage

claim

once

with

the

transportation

company and

promptly

notify

the

nearest

General

Electric

Sales

Office.

Exercise

care

when

handling

or unpacking

the

relay

avoid

disturbing

adjustments

damaging

the

relay.

the

relays

are

not

installed

immediately,

they

should

stored

their

original

cartons

place

that

free

from

moisture,

dust

and

metallic

particles.

Foreign

matter

collected

the

outside

the

case

may

find

its

way

the

inside

the

case

when

the

cover

removed,

creating

the

possiblity

relay

nisoperation.

ACCEPTANCE

TESTS

Inilnediately

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

the

test

indicates

that

readjustment

necessary,

refer

the

section

SERVICING.

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