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INSTRUCTIONS

GEK

-

34069

B

PERCENTAGE

DIFFERENTIAL

RELAY

TYPE

IFD

MODEL

12

IFD

51

D

(

-

)

A

GENERAL

W

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

-

34069

CONTENTS

PAGE

3

DESCRIPTION

APPLICATION

RATINGS

.

...

3

3

3

CURRENT

CIRCUITS

CONTACT

RATINGS

CHARACTERISTICS

OPERATING

CHARACTERISTICS

-

INDUCTION

UNIT

OPERATING

CHARACTERISTICS

CURVES

HINGED

ARMATURE

FAULT

DETECTOR

OPERATING

PRINCIPLES

.

.

.

TORQUE

EQUATION

AND

INDUCTION

UNIT

PICKUP

.

TORQUE

BALANCE

EQUATION

OPERATING

CURRENT

EQUATION

4

4

4

4

4

5

5

5

5

5

BURDENS

CONSTRUCTION

INDUCTION

DISK

UNIT

HINGED

ARMATURE

FAULT

DETECTOR

TARGET

/

SEAL

-

IN

UNIT

RECEIVING

,

HANDLING

AND

STORAGE

ACCEPTANCE

TEST

VISUAL

INSPECTION

MECHANICAL

INSPECTION

DRAWOUT

RELAYS

GENERAL

..

.

.

.

POWER

REQUIREMENTS

GENERAL

ELECTRICAL

TESTS

INDUCTION

UNIT

PICKUP

TEST

..

..

.

OPERATING

CURRENTS

RESTRAINT

CURRENT

INSTANTANEOUS

UNIT

FAULT

DETECTOR

.

.

.

SETTING

THE

INSTANTANEOUS

UNIT

TARGET

AND

SEAL

-

IN

UNIT

PICK

-

UP

AND

DROP

OUT

TEST

INSTALLATION

ELECTRICAL

TESTS

6

6

6

6

7

7

7

7

7

8

8

8

8

8

8

8

9

9

9

9

LOCATION

MOUNTING

CONNECTIONS

TARGET

AND

SEAL

-

IN

ELEMENT

SETTING

Q

9

9

10

SERVICING

10

INDUCTION

UNIT

ADJUSTMENT

RENEWAL

PARTS

11

2

Courtesy of NationalSwitchgear.com

GEK

-

34069

PERCENTAGE

DIFFERENTIAL

RELAY

TYPE

IFD

MODEL

12

IFD

51

D

(

-

)

A

DESCRIPTION

The

IFD

51

D

relay

is

an

induction

disk

ground

differential

relay

.

It

was

designed

specifically

to

provide

differential

protection

for

single

phase

-

to

-

ground

faults

in

the

wye

connected

winding

of

a

power

transformer

and

the

leads

to

its

associated

circuit

breaker

.

The

IFD

51

D

relay

is

shock

resistant

and

is

supplied

complete

with

target

in

a

standard

M

2

drawout

case

.

The

internal

connections

and

the

outline

and

dimensions

are

illustrated

in

Figures

1

and

2

respectively

.

APPLICATION

The

IFD

51

D

was

specifically

designed

to

provide

differential

protection

for

single

-

phase

-

to

-

ground

faults

in

the

zone

from

the

wye

connected

winding

and

its

associated

circuit

breaker

.

This

zone

includes

the

transformer

wye

winding

itself

.

The

IFD

is

principally

intended

for

application

on

transformers

where

the

neutral

is

grounded

through

a

resistor

which

limits

the

single

phase

-

to

-

ground

fault

currents

to

a

range

of

200

-

2000

amperes

.

However

,

it

may

also

be

applied

to

solidly

grounded

transformers

if

the

neutral

CT

is

of

good

quality

and

has

the

same

ratio

as

the

circuit

breaker

CT

'

s

so

that

no

auxiliary

CT

is

required

.

The

power

transformer

winding

with

which

the

relay

is

associated

must

have

its

own

neutral

lead

as

illustrated

in

the

external

connection

of

Figure

5

.

That

is

to

say

,

that

the

power

transformer

cannot

be

an

auto

-

transformer

nor

can

it

be

a

wye

-

delta

-

wye

bank

with

a

common

neutral

terminal

for

both

windings

.

An

auxiliary

CT

is

normally

required

to

match

the

ratio

between

the

circuit

breaker

CT

'

s

and

the

transformer

neutral

CT

.

The

ratio

of

this

auxiliary

CT

can

be

evaluated

by

dividing

the

ratio

of

the

circuit

breaker

CT

‘

s

(

on

the

tap

used

)

by

the

ratio

of

the

neutral

CT

.

The

purpose

of

the

instantaneous

unit

in

the

IFD

51

D

is

to

make

the

relay

shock

resistant

The

pick

-

up

setting

of

the

instantaneous

unit

should

be

set

so

that

it

does

not

reduce

the

sensitivity

of

the

protection

.

Since

the

basic

sensitivity

of

the

main

unit

of

the

relay

is

0.5

or

1.0

amperes

,

it

is

suggested

that

the

setting

of

the

instantaneous

unit

be

in

the

range

of

0.5

to

1.0

amperes

.

As

indicated

in

the

section

under

CHARACTERISTICS

,

the

IFD

51

D

may

be

set

for

12.5

or

25

percent

slope

.

With

the

12.5

percent

slope

setting

,

the

main

unit

will

pick

up

at

about

0.5

amperes

in

the

operating

coil

with

no

current

in

any

restraint

coil

.

With

the

25

percent

slope

,

the

current

required

to

produce

operation

increases

to

about

1

ampere

.

The

higher

slope

setting

will

provide

security

against

improper

operation

in

the

event

of

circuit

breaxer

CT

saturation

during

external

multi

-

phase

faults

.

As

indicated

in

the

external

connections

of

Figure

5

,

only

one

IFD

51

D

relay

is

required

for

the

protection

described

.

Also

,

a

source

of

d

-

c

is

required

in

order

for

the

relay

to

trip

the

breaker

.

This

may

either

be

a

station

battery

or

a

capacitor

trip

device

.

RATINGS

CURRENT

CIRCUITS

Table

A

below

gives

the

current

circuit

ratings

.

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

to

provide

for

every

possible

contingency

to

be

met

in

connection

with

installation

,

operation

or

maintenance

.

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

'

s

purposes

,

the

matter

should

be

referred

to

the

.

-

General

Electric

Company

.

Should

To

the

extent

required

the

products

described

herein

meet

applicable

ANSI

,

IEEE

and

NEMA

standards

;

but

no

such

assurance

is

given

with

respect

to

local

codes

and

ordinances

because

they

vary

greatly

.

3

Courtesy of NationalSwitchgear.com

GEK

-

34069

TABLE

A

CONTINUOUS

RATING

AMPS

ONE

SECOND

RATING

AMPS

CIRCUIT

Operating

Coil

260

5

Restraint

Coils

10

260

Hinged

Armature

Fault

Detector

0.5

-

2

Amp

Range

0.75

10

CONTACT

RATINGS

The

current

-

closing

rating

of

the

contacts

is

30

amperes

for

voltages

not

exceeding

250

volts

.

The

current

-

carrying

ratings

are

offected

by

the

selection

of

the

tap

on

the

target

and

seal

-

in

coil

as

indicated

in

the

following

table

:

Amperes

,

a

-

c

or

d

-

c

Function

2

-

Amp

Tap

0.2

Amp

Tap

Tripping

Duty

Carry

Continuously

Operating

Range

Resistance

Impedance

at

60

cy

30

5

3

0.3

2

-

30

0.2

-

2

0.13

7

0.53

52

If

the

tripping

current

exceeds

30

amperes

an

auxiliary

relay

should

be

used

,

the

connections

being

such

that

the

tripping

current

does

not

pass

through

the

contacts

or

the

target

and

seal

in

coils

of

the

protective

relay

.

CHARACTERISTICS

OPERATING

CHARACTERISTICS

-

INDUCTION

UNIT

The

IFD

51

D

relay

has

an

operating

coil

with

taps

available

for

selecting

either

a

12.5

or

25

percent

slope

.

Percent

slope

is

defined

as

operating

coil

current

required

to

close

contacts

divided

by

restraint

current

flowing

in

two

restraint

coils

multiplied

by

100

percent

.

For

the

purpose

of

this

definition

the

currents

in

the

two

restraint

coils

are

equal

.

With

equal

currents

flowing

in

all

three

restraint

coils

,

the

operating

current

required

to

close

contacts

will

be

approximately

1.23

times

that

required

with

the

same

current

flowing

in

only

two

restraint

coils

.

With

the

operating

coil

set

on

the

12.5

percent

tap

,

the

induction

unit

will

close

its

contacts

at

0.5

amps

with

zero

restraint

current

.

On

the

25

percent

tap

,

operating

current

required

to

close

contacts

with

zero

restraint

is

approximately

twice

that

required

on

the

12.5

percent

tap

or

approximately

1

ampere

.

OPERATING

CHARACTERISTIC

CURVES

Figure

3

shows

the

operating

current

vs

restraining

current

characteristic

curve

'

for

the

IFD

51

D

.

Figure

4

shows

the

time

current

curve

for

this

relay

.

These

times

apply

only

for

the

1

/

2

time

dial

setting

.

Times

may

be

increased

by

increasing

the

time

dial

setting

,

but

the

time

dial

should

never

be

set

below

the

1

/

4

position

.

HINGED

ARMATURE

FAULT

DETECTOR

The

IFD

51

D

relay

includes

a

shock

resistant

hinged

armature

type

overcurrent

unit

.

The

contact

of

this

overcurrent

unit

is

connected

in

series

with

the

induction

disk

unit

contact

so

that

both

must

be

picked

up

to

initiate

a

tripping

output

.

This

checks

that

fault

current

is

flowing

and

guards

against

false

tripping

by

the

induction

disk

unit

if

it

should

close

its

contact

due

to

shock

.

k

Courtesy of NationalSwitchgear.com

GEK

-

34069

The

hinged

armature

overcurrent

unit

is

adjustable

over

a

pickup

current

range

of

0

,

5

-

2

amps

by

means

of

an

adjustable

core

.

This

unit

should

be

set

to

pickup

for

any

fault

condition

for

which

the

induction

disk

unit

is

expected

to

operate

.

OPERATING

PRINCIPLES

The

IFD

51

D

relay

induction

unit

has

four

U

-

magnets

operating

on

two

disks

mounted

on

a

common

shaft

.

Three

of

the

U

-

Magnets

have

restraining

coils

which

drive

the

disk

in

the

contact

opening

direction

.

The

fourth

U

-

Magnet

has

an

operating

coil

which

drives

the

disk

in

the

contact

closing

direction

.

The

induction

unit

will

close

its

contacts

when

the

torque

produced

by

the

operating

coil

exceeds

the

sum

of

the

torques

produced

by

the

control

spring

and

the

three

restraining

coils

.

TORQUE

EQUATION

AND

INDUCTION

UNIT

PICKUP

Each

of

the

four

U

-

Magnets

produces

a

torque

proportional

to

the

square

of

the

current

flowing

in

its

operating

coil

,

the

operating

coil

in

the

contact

closing

direction

and

the

restraining

coils

in

the

contact

opening

direction

.

Using

this

fact

plus

the

basic

torque

balance

equation

,

we

can

write

an

equation

for

operating

current

in

terms

of

currents

in

the

three

restraining

coils

and

control

spring

setting

.

Torque

Balance

Equation

To

=

TR

1

+

TR

2

+

TR

3

+

TS

where

T

0

=

operating

coil

torque

Tftl

®

TR

2

>

TR

3

=

tor

9

ue

produced

by

each

of

the

three

restraining

coils

respectively

T

$

=

Spring

torque

Operating

Current

Equation

:

I

oI

2

=

K

1

^

Rl

2

+

+

JR

32

)

+

!

S

2

where

I

0

=

operating

current

required

to

close

contacts

IRI

,

IR

2

*

*

R

3

=

current

in

each

of

the

three

restraining

coils

respectively

.

1

^

=

Operating

coil

current

to

overcome

spring

force

(

Close

contacts

with

zero

restraining

current

)

,

and

=

Design

constant

of

relay

,

may

be

determined

by

working

operating

current

equation

with

point

on

operating

current

vs

restraint

curve

.

Note

Ki

and

1

$

are

a

function

of

operating

coil

tap

setting

.

An

example

of

the

way

the

operating

current

equation

may

be

used

is

as

follows

.

With

the

operating

coil

set

on

the

12.5

percent

tap

the

induction

unit

will

close

its

contacts

with

0

,

5

amps

in

the

operating

coil

and

zero

restraint

current

(

I

<

.

=

0.5

)

.

The

operating

characteristic

curves

give

an

operating

current

of

about

0.9

amps

with

5

amps

in

three

restraints

.

Plugging

these

values

into

the

operating

current

equation

and

solving

for

Kj

,

we

get

=

7.47

X

10

“

3

.

Using

these

values

of

and

1

$

,

we

can

calculate

the

operating

current

required

to

close

contacts

for

different

conditions

of

restraint

current

.

For

instance

,

using

=

7.47

X

10

~

3

and

1

$

=

0.5

,

the

operating

current

equation

reveals

that

the

induction

unit

will

just

close

its

contacts

with

1.32

amps

in

the

operating

coil

and

10

amps

in

two

restraint

coils

.

BURDENS

Table

A

below

gives

the

impedances

of

the

coils

in

these

relays

.

These

impedances

are

measured

with

5

amperes

flowing

through

the

specified

coil

.

The

operating

coil

impedance

given

is

for

the

12.5

percent

tap

.

COIL

IMPEDANCE

Z

OHMS

Operating

Coil

Restraininq

Coi

~

1

~

s

.

43

+

j

.

99

1.08

6.065

+

j

6.52

0

VOb

8

Hinged

Armature

Unit

10.3

+

j

8.1

12.9

5

Courtesy of NationalSwitchgear.com

GEK

-

34069

The

operating

coil

impedance

rises

to

approximately

1.4

ohms

at

pickup

or

at

0.5

amps

,

when

set

on

the

12

,

5

percent

tap

.

T

^

e

operating

coil

impedance

on

the

25

percent

tap

is

approximately

one

quarter

the

impedance

given

for

the

12.5

percent

tap

.

CONSTRUCTION

The

IFD

51

D

relay

consists

of

an

induction

disk

unit

,

a

target

/

seal

-

in

unit

,

and

a

hinged

armature

overcurrent

unit

mounted

in

a

medium

size

double

ended

drawout

M

2

case

.

The

internal

connections

diagram

is

shown

in

Figure

1

,

the

outline

and

panel

drilling

is

shown

in

Figure

2

.

INDUCTION

DISK

UNIT

The

induction

disk

unit

consists

of

two

disks

mounted

on

a

common

shaft

driven

by

four

U

-

Magnet

and

coil

assemblies

.

The

lower

left

U

-

Magnet

and

coil

is

the

operating

coil

,

this

element

drives

the

disks

in

the

contact

closing

direction

.

The

operating

coil

is

tapped

so

that

the

relay

may

be

set

for

either

a

12.5

or

25

percent

slope

.

The

operating

coil

tap

may

be

selected

by

setting

the

tap

plug

in

the

tap

block

position

indicated

by

the

engraved

tap

plate

.

The

tap

block

is

mounted

above

the

induction

disk

unit

.

The

operating

coil

U

-

Magnet

is

provided

with

fixed

shading

rings

which

provide

the

phase

shift

in

flux

necessary

to

drive

the

disk

.

The

other

three

U

-

Magnets

mount

the

restraint

coils

.

These

three

elements

drive

the

disk

in

the

contact

opening

direction

.

The

restraint

U

-

magnets

and

coils

are

similar

to

the

operating

U

-

Magnet

and

coil

except

the

restraint

coils

are

untrapped

and

the

restraint

U

-

Magnets

use

wound

shading

coils

instead

of

shading

rings

to

produce

the

phase

shifted

flux

necessary

to

drive

the

disk

.

The

wound

shading

coils

of

the

restraint

elements

are

wired

to

three

separate

slide

wire

resistors

mounted

in

the

back

of

the

relay

.

These

resistors

are

used

to

adjust

the

basic

torque

characteristic

of

the

restraint

elements

.

As

indicated

by

the

internal

connections

diagram

(

Fig

.

1

)

the

bottom

resistor

adjusts

the

lower

right

restraint

element

,

the

middle

resistor

adjusts

the

upper

right

,

and

the

top

resistor

adjusts

the

upper

left

restraint

.

The

control

spring

mounted

at

the

top

of

induction

disk

unit

is

used

to

adjust

the

operating

coil

current

required

to

close

contacts

with

no

current

in

the

restraints

.

This

control

spring

may

be

adjusted

by

turning

the

notched

adjusting

ring

.

The

time

dial

is

above

the

control

spring

.

The

time

dial

is

used

to

increase

the

travel

on

the

disk

and

this

increase

operating

time

.

The

time

dial

on

the

IFD

51

D

is

locked

by

two

locking

screws

through

the

top

of

the

frame

.

These

locking

screws

prevent

restraint

torque

from

turning

the

time

dial

and

changing

the

operating

time

setting

.

The

relay

time

dial

is

normally

set

and

locked

in

the

1

/

2

position

.

The

induction

disk

unit

is

provided

with

a

drag

magnet

which

serves

to

retard

the

motion

of

the

disk

to

give

the

correct

time

delay

.

HINGED

ARMATURE

FAULT

DETECTOR

The

IFD

51

D

relay

is

provided

with

a

small

hinged

armature

overcurrent

unit

.

This

unit

is

used

to

make

the

relay

more

shock

resistant

.

The

operating

coil

of

this

unit

is

wired

to

studs

4

-

5

and

the

contacts

are

in

series

with

the

induction

unit

contacts

.

The

pickup

current

of

this

unit

is

adjustable

over

a

4

-

1

range

range

by

means

of

an

adjustable

core

.

The

core

is

provided

with

a

locknut

which

must

be

loosened

before

the

core

may

be

turned

to

change

pick

-

up

.

The

fault

detector

unit

is

mounted

on

the

upper

right

hand

side

of

the

relay

.

TARGET

/

SEAL

-

IN

UNIT

The

target

seal

-

in

unit

is

mounted

in

the

top

of

the

case

on

the

left

hand

side

.

The

seal

-

in

unit

has

its

coil

in

series

and

its

contacts

in

parallel

with

the

contacts

of

the

induction

disk

unit

and

the

instantaneous

overcurrent

unit

such

that

when

the

instantaneous

unit

and

induction

disk

unit

contacts

close

the

seal

-

in

picks

up

and

seals

in

.

When

the

seal

in

unit

picks

up

,

it

raises

a

target

into

view

which

latches

up

and

remains

exposed

until

it

is

released

by

pressing

a

button

beneath

the

lower

left

corner

of

the

cover

.

The

components

of

the

IFD

51

D

relay

are

mounted

in

a

M

2

case

whose

outline

and

drilling

plan

is

shown

in

Figure

2

.

The

relay

^

components

are

mounted

in

a

cradle

assembly

which

is

latched

into

a

drawout

case

when

the

relay

is

in

operation

but

it

can

be

easily

removed

when

desired

.

To

do

this

,

the

relay

is

first

disconnected

by

removing

the

connection

plug

which

completes

the

electrical

connections

between

the

6

Courtesy of NationalSwitchgear.com

GEK

-

34069

case

block

and

the

cradle

block

.

To

test

the

relay

in

its

case

this

connection

block

can

be

replaced

by

a

test

plug

.

The

cover

,

which

is

attached

to

front

of

the

relay

case

,

contains

the

target

reset

mechanism

and

an

interlock

arm

which

prevents

the

cover

from

being

replaced

until

the

connection

plugs

have

been

inserted

.

The

relay

case

is

suitable

for

either

semi

flush

or

surface

mounting

on

all

panels

up

to

2

inches

thick

and

appropriate

hardware

is

available

.

However

,

panel

thickness

must

be

indicated

on

the

relay

order

to

insure

that

proper

hardware

will

be

included

.

Every

circuit

in

the

drawout

case

has

an

auxiliary

brush

,

as

shown

in

Fig

.

6

,

to

provide

adequate

overlap

when

the

connecting

plug

is

withdrawn

or

inserted

.

Some

circuits

are

equipped

with

shorting

bars

(

see

Figure

1

)

and

on

these

circuits

it

is

especially

important

that

the

auxiliary

brush

makes

contact

as

indicated

in

Fig

.

6

.

with

adequate

pressure

to

prevent

the

opening

of

C

.

T

.

secondary

circuits

.

RECEIVING

,

HANDLING

AND

STORAGE

These

relays

,

when

not

included

as

a

part

of

a

control

panel

,

will

be

shipped

in

cartons

designed

to

protect

them

against

damage

.

Immediately

upon

receipt

of

a

relay

,

examine

it

for

any

damage

sustained

in

transit

.

If

injury

or

damage

resulting

from

rough

handling

is

evident

,

file

a

damage

claim

at

once

with

the

transportation

company

and

promptly

notify

the

hearest

General

Electric

Apparatus

Sales

Office

.

Reasonable

care

should

be

exercised

in

unpacking

the

relay

in

order

that

none

of

the

parts

are

in

-

jured

or

the

adjustments

disturbed

.

If

the

relays

are

not

to

be

installed

immediately

,

they

should

be

stored

in

their

original

cartons

in

a

place

that

is

free

from

moisture

,

dust

and

metallic

chips

.

Foreign

matter

collected

on

the

outside

of

the

case

may

find

its

way

inside

when

the

cover

is

removed

and

cause

trouble

in

the

operation

of

the

relay

.

ACCEPTANCE

TEST

Immediately

upon

receipt

of

the

relay

,

an

inspection

and

acceptance

test

should

be

made

to

insure

that

no

damage

has

been

sustained

in

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

.

VISUAL

INSPECTION

Check

the

nameplate

stamping

to

insure

that

the

model

number

and

rating

of

the

relay

agree

with

the

requisition

.

Remove

the

relay

from

its

case

and

check

that

there

are

no

broken

or

cracked

molded

parts

or

othc

signs

of

physical

damage

,

and

that

all

the

screws

are

tight

.

MECHANICAL

INSPECTION

1

.

There

should

be

no

noticable

friction

when

the

disk

is

rotated

slowly

clockwise

.

The

disk

should

return

by

itself

to

its

rest

position

.

2

.

Make

sure

the

control

spring

is

not

deformed

nor

its

convolutions

tangled

^

or

touching

.

3

.

The

armature

and

contacts

of

the

seal

-

in

unit

as

well

as

the

armature

and

contacts

of

the

instantaneous

unit

should

move

freely

when

operated

by

hand

,

there

should

be

at

least

1

/

32

"

wipe

on

the

seal

in

and

instantaneous

unit

contacts

.

4

.

The

targets

in

the

seal

-

in

unit

and

in

the

instantaneous

unit

must

come

into

view

and

latch

when

the

armature

are

operated

by

hand

and

should

unlatch

when

the

target

release

level

is

operated

.

5

.

Make

sure

that

the

fingers

and

shorting

bars

agree

with

the

internal

connections

diagram

.

6

.

The

time

dial

locking

screws

should

be

observed

to

lock

the

time

dial

so

that

it

can

not

be

turned

.

CAUTION

:

EVERY

CIRCUIT

IN

THE

DRAWOUT

CASE

HAS

AN

AUXILIARY

BRUSH

.

IT

IS

ESPECIALLY

IMPORTANT

ON

CURRENT

CIRCUITS

AND

OTHER

CIRCUITS

WITH

SHORTING

BARS

THAT

THE

AUXILIARY

BRUSH

BE

BENT

HIGH

ENOUGH

TO

ENGAGE

THE

CONNECTING

PLUG

OR

TEST

PLUG

BEFORE

THE

MAIN

BRUSHES

DO

.

THIS

WILL

PREVENT

CT

SECONDARY

CIRCUITS

FROM

BEING

OPENED

.

DRAWOUT

RELAYS

GENERAL

Since

all

drawout

relays

in

service

operate

in

their

case

,

it

is

recommended

that

they

be

tested

ir

their

case

or

an

equivalent

steel

case

.

In

this

way

any

magnetic

effects

of

the

enclosure

will

be

7

Courtesy of NationalSwitchgear.com

GE

K

-

34069

accurately

duplicated

during

testing

,

using

a

12

XLA

13

A

test

plug

,

shorting

bars

in

the

case

.

plug

allows

greater

testing

flexibility

,

it

also

requires

C

.

T

.

shorting

jumpers

and

the

'

exercise

of

greater

care

since

connections

are

made

to

both

the

relay

and

the

external

circuitry

.

POWER

REQUIREMENTS

GENERAL

A

relay

may

be

tested

without

removing

it

from

the

panel

by

This

plug

makes

connections

only

with

the

relay

and

does

not

disturb

any

Of

course

,

the

12

XLA

12

A

test

plug

may

also

be

used

.

Although

this

test

All

alternating

current

operated

devices

are

affected

by

frequency

.

Since

non

sinusoidal

waveforms

can

be

analyzed

as

a

fundamental

frequency

plus

harmonics

of

the

fundamental

frequency

,

it

follows

that

alternating

current

devices

(

relays

)

will

be

affected

by

the

applied

waveform

.

Therefore

,

in

order

to

properly

test

alternating

current

relays

it

is

essential

to

use

a

sine

wave

of

current

and

/

or

voltage

.

The

purity

of

the

sine

wave

(

i

.

e

.

its

freedom

from

harmonics

)

cannot

be

expressed

as

a

finite

number

for

any

particular

relay

,

however

,

any

relay

using

tuned

circuit

,

R

-

L

or

C

networks

,

or

saturating

electromagnets

(

such

as

induction

disk

relays

)

would

be

essentially

affected

by

non

-

sinusoidal

wave

forms

.

ELECTRICAL

TESTS

The

IFD

51

D

relay

may

be

satisfactorily

tested

on

a

single

phase

basis

,

in

that

its

performance

with

single

phase

currents

is

not

significantly

different

than

with

three

phase

currents

.

The

electrical

tests

needed

to

determine

that

the

relay

adjustments

have

not

been

disturbed

are

as

follows

:

NOTE

:

It

is

recommended

that

a

voltage

source

of

115

volts

or

more

of

rated

frequency

with

resistive

loading

be

used

to

perform

these

tests

.

INDUCTION

UNIT

PICKUP

TEST

Apply

gradually

increasing

current

to

operating

coil

circuit

(

studs

2

-

3

)

.

With

the

operating

coil

set

on

the

0.5

amp

tap

,

the

relay

should

just

hold

its

contacts

closed

with

a

current

of

0.48

-

0.52

amps

flowing

.

The

contact

circuit

is

between

studs

1

-

11

and

the

instantaneous

unit

contacts

must

be

jumpered

for

this

circuit

to

show

continuity

when

the

induction

disk

unit

contacts

close

.

Set

on

the

25

percent

tap

the

contact

closing

current

should

be

approximately

0.9

amps

.

OPERATING

CURRENTS

RESTRAINT

CURRENT

See

Figure

7

for

test

connections

and

Figure

1

for

relay

internal

connections

.

With

the

three

restraint

currents

wired

in

series

(

jumper

stud

7

to

8

,

9

-

16

)

apply

5

amps

to

the

three

restraints

(

be

-

tween

studs

6

-

17

)

.

With

the

operating

coil

set

on

the

12.5

percent

tap

the

relay

should

just

close

its

contacts

with

0.75

-

0.95

amps

flowing

in

the

operating

coil

.

For

information

on

adjusting

the

restraint

current

vs

operating

current

,

refer

to

the

section

on

Servicing

.

INSTANTANEOUS

UNIT

FAULT

DETECTOR

The

pickup

current

of

the

fault

detector

may

be

checked

by

applying

current

to

studs

4

-

5

.

unit

is

adjustable

over

a

range

of

pickup

currents

from

0.5

-

2

amps

by

turning

the

adjustable

core

,

unit

is

set

at

the

factory

to

pickup

at

0.45

-

0.55

amps

,

this

adjustment

may

be

changed

if

desired

.

This

The

SETTING

THE

INSTANTANEOUS

UNIT

Loosen

the

locknut

and

turn

pole

piece

toward

che

desired

setting

.

Turning

the

pole

piece

up

increases

the

pick

up

,

turning

the

pole

piece

down

decreases

the

pick

up

.

Bring

up

the

current

slowly

until

unit

picks

up

.

It

may

be

necessary

to

repeat

this

operation

until

the

desired

pick

up

value

is

obtained

.

Once

the

desired

pick

up

value

is

reached

,

tighten

the

locknut

.

CAUTION

:

THE

INSTANTANEOUS

UNIT

IS

RATED

1.5

TIMES

MINIMUM

PICK

UP

.

DO

NOT

LEAVE

THE

TEST

CURRENT

ON

ttiOTONG

AS

IT

MAY

DAMAGE

THE

UNIT

.

TARGET

AND

SEAL

-

IN

UNIT

The

target

and

seal

-

in

unit

has

an

operating

coil

tapped

at

0.2

and

2.0

amperes

.

The

relay

is

shipped

from

the

factory

with

the

tap

screw

in

the

lover

ampere

position

.

The

tap

screw

is

the

screw

holding

the

right

hand

stationary

contact

.

To

change

the

tap

setting

,

first

remove

one

screw

from

the

left

hand

stationary

contact

and

place

it

in

the

desired

tap

.

Next

remove

the

screw

from

the

undesired

tap

and

place

it

on

the

left

hand

stationary

contact

where

the

first

screw

was

removed

.

This

procedure

necessary

to

prevent

the

right

hand

stationary

contact

from

getting

out

of

adjustment

.

Screws

should

not

be

in

both

taps

at

the

same

time

.

8

Courtesy of NationalSwitchgear.com

GEK

-

34069

PICK

UP

AND

DROP

OUT

TEST

1

.

Connect

relay

studs

1

and

2

to

a

D

.

C

.

source

,

ammeter

and

load

box

so

that

the

current

can

be

controlled

over

a

range

of

0.1

to

2.0

amperes

.

2

.

Jumper

the

induction

disk

and

instantaneous

unit

contacts

.

3

.

Increase

the

current

slowly

until

the

seal

-

in

unit

picks

up

.

See

Table

XI

below

.

4

.

Remove

the

jumper

from

the

instantaneous

unit

contacts

,

the

seal

-

in

unit

should

remain

in

the

pick

up

position

.

5

.

Decrease

the

current

slowly

until

the

seal

-

in

unit

drops

out

.

See

Table

XI

.

TABLE

XI

PICK

-

UP

CURRENT

DROPOUT

CURRENT

TAP

0.2

0.15

-

0.195

.

05

OR

MORE

2.0

1.50

-

1.95

.

55

OR

MORE

INSTALLATION

If

after

the

acceptance

tests

the

relay

is

held

in

storage

before

shipment

to

the

job

site

,

it

is

recommended

that

the

visual

and

mechanical

inspection

described

under

the

section

on

ACCEPTANCE

TESTS

be

repeated

before

installation

.

The

relay

must

be

mounted

on

a

vertical

surface

and

must

be

level

for

correct

operation

.

ELECTRICAL

TESTS

It

is

recommended

that

the

electrical

tests

outlined

under

acceptance

tests

be

repeated

at

the

time

of

installation

.

If

desired

,

the

induction

disk

unit

may

be

checked

at

several

operating

points

using

a

method

similar

to

that

outlined

in

acceptance

tests

.

The

fault

detector

and

target

seal

in

units

should

be

set

at

their

desired

operating

points

and

these

settings

should

be

electrically

tested

.

LOCATION

The

location

should

be

clean

and

dry

,

free

from

dust

and

excessive

vibration

,

and

well

lighted

to

facilitate

inspection

and

testing

.

MOUNTING

The

relay

should

be

mounted

on

a

vertical

surface

.

The

outline

and

panel

diagram

is

shown

in

Figure

2

.

CONNECTIONS

Internal

connection

diagram

is

shown

in

Figure

1

.

A

typical

wiring

diagram

is

given

in

Figure

5

.

One

of

the

mounting

studs

or

screws

should

be

permanently

grounded

by

a

conductor

not

less

than

No

.

12

B

&

S

gage

copper

wire

or

its

equivalent

.

TARGET

AND

SEAL

-

IN

ELEMENT

SETTING

For

trip

coils

operating

on

currents

ranging

from

0.2

up

to

2.0

amperes

at

the

minimum

control

voltage

,

set

the

target

and

seal

-

in

tap

plug

in

the

0.2

ampere

tap

.

For

trip

coils

operating

on

currents

ranging

from

2

to

30

amperes

at

the

minimum

control

voltage

place

the

tap

plug

in

the

2

ampere

tcip

.

The

tap

plug

is

the

screw

holding

the

right

-

hand

stationary

contact

of

the

seal

-

in

element

.

To

change

the

tap

setting

,

first

remove

the

connecting

plug

.

Then

,

take

a

screw

from

the

left

-

hand

stationary

contact

and

place

it

in

the

desired

tap

.

Next

remove

the

screw

from

the

other

tap

,

and

place

it

in

the

left

-

hand

contact

.

This

procedure

is

necessary

to

prevent

the

right

-

hand

stationary

contact

from

getting

out

of

adjustment

.

Screws

should

not

be

in

both

taps

at

the

same

time

as

pickup

for

d

-

c

will

9

Courtesy of NationalSwitchgear.com

GEK

-

34069

be

the

higher

tap

value

and

a

-

c

pickup

will

be

increased

.

SERVICING

I f

it

is

found

that

the

relay

calibrations

are

out

of

adjustment

then

proceed

as

follows

:

1

.

If

there

are

indications

of

excessive

friction

the

lower

jewel

may

be

tested

for

cracks

by

exploring

its

surface

with

the

point

of

a

fine

needle

.

It

it

is

necessary

to

replace

the

jewel

a

new

pivot

should

be

screwed

into

the

bottom

of

the

shaft

at

the

same

time

.

The

jewel

should

be

turned

up

until

the

disk

is

centered

in

the

air

gaps

,

after

which

it

should

be

locked

in

this

position

by

the

set

screw

provided

for

this

purpose

.

The

upper

bearing

end

play

can

be

felt

;

about

0

,

015

inch

is

correct

.

2

.

The

differential

unit

pick

up

can

be

adjusted

by

turning

the

control

spring

adjusting

ring

.

3

.

To

change

target

seal

-

in

tap

settings

,

proceed

as

follows

:

The

tap

plug

is

the

screw

holding

the

right

-

hand

stationary

contact

of

the

seal

-

in

unit

.

To

change

the

tap

setting

,

first

remove

the

connection

plug

.

Then

,

take

a

screw

from

the

left

-

hand

stationary

contact

and

place

it

in

the

desired

tap

.

Next

remove

the

screw

from

the

other

tap

,

and

place

it

in

the

left

-

hand

contact

.

This

procedure

is

necessary

to

prevent

the

right

hand

stationary

contact

from

getting

out

of

adjustment

.

Screws

should

not

be

in

both

taps

at

the

same

time

as

pickup

for

d

-

c

will

be

the

higher

tap

value

and

a

-

c

pickup

will

be

increased

.

4

.

For

cleaning

relay

contacts

a

flexible

burnishing

tool

should

be

used

.

This

consists

of

an

etched

roughened

strip

of

flexible

metal

resembling

a

superfine

file

which

removes

corroded

material

quickly

without

scratching

the

surface

.

The

flexibility

of

the

tool

insures

the

cleaning

of

the

actual

points

of

contact

.

Never

use

knives

,

files

,

abrasive

paper

or

cloth

to

clean

relay

contacts

.

A

burnishing

tool

as

described

above

can

be

obtained

from

the

factory

.

5

.

Instantaneous

overcurrent

unit

adjustment

.

Select

the

current

above

which

it

is

desired

to

have

the

instantaneous

unit

operate

and

set

the

adjustable

pole

piece

so

that

the

top

of

hexagon

head

is

even

with

the

desired

calibration

on

the

scale

.

To

raise

or

lower

the

pole

piece

,

loosen

the

locknut

and

turn

it

up

or

down

and

then

tighten

in

position

.

INDUCTION

UNIT

ADJUSTMENT

Should

it

become

necessary

the

induction

disk

unit

may

be

restored

to

the

factory

calibration

as

follows

:

1

.

Pickup

Setting

-

The

pickup

current

with

no

restraint

current

flowing

should

be

set

to

be

0.48

-

0.52

amps

with

the

operating

coil

set

on

the

12.5

percent

tap

by

adjusting

the

control

spring

.

2

.

Preliminary

Restraint

Adjustment

.

Using

test

connections

similar

to

figure

7

but

with

jumpers

removed

energize

one

restraint

coil

at

a

time

and

adjust

the

slide

band

resistors

in

the

back

of

the

case

.

Do

not

change

control

spring

setting

.

With

relay

on

12.5

%

tap

,

adjust

as

follows

:

Set

10

amps

through

studs

6

and

7

and

adjust

bottom

resistor

until

contacts

just

close

with

1.0

amps

in

studs

2

-

3

.

Set

10

amps

through

studs

8

and

9

and

adjust

middle

resistor

until

contacts

just

close

with

1.0

amps

in

studs

2

-

3

.

Set

10

amps

through

studs

16

and

17

and

adjust

tap

resistor

until

contacts

just

close

with

1.0

amps

in

studs

2

-

3

.

3

.

Restraint

Test

Using

test

connections

similar

to

those

shown

in

Figure

7

except

with

jumpers

installed

tying

studs

6

,

8

and

16

together

instead

of

the

jumpers

shown

in

Figure

7

,

test

the

restraint

coils

in

pairs

as

follows

.

Relay

set

ON

tap

indicated

in

table

below

check

combinations

of

restraint

coils

per

table

below

.

Do

not

change

control

spring

setting

.

10

Courtesy of NationalSwitchgear.com