GE CEY52B Manuel utilisateur

INSTRUCTION

GEK—45495

MHO

DISTANCE

RELAY

TYPE

CEY52B

GENERALS

ELECTRIC

K-A

5495

CONTENTS

PAGE

LsURJPTION

APF’L

(Al

RATINGS

OPERATING

PRINCIPLES

CHARACT[RISEILS

BURDENS

LALCULA1 iON

SETTINGS

UONSTRUCT

ION

RECEIVING,

HANDLING

AND

STORAGE

ACLEPTANCE

TESTS

ASTALLATION

PROCEDURE

INSPECTION

PLRIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

SERVICING

RENEWAL

PARTS

‘S.)

C-)

“S

K-4 54

MHO

DiSTANCE

RELAY

TYPE

CEY52B

DESCRIPTION

The

CEY52B

relay

three-phase,

high

speed,

single-zone

directional

mho

distance

relay.

WaS

designed

specifically

for

use

with

the

CEX2OA

CEX2OB

reactance

type

relay.

See

Table

The

CEY52B

relay

constructed

three

single—phase

units

mounted

one

L2—D

case

with

provisions

for

sirjle

phase

testing.

The

interndl

connections

for

the

relay

are

shown

Figure

10,

while

outline

and

panel

drilling

dimensions

are

shown

Figure

16.

Typical

external

connections

the

relay

are

shown

Figure

The

relay is

not

intended

for

use

first

zone

function,

thus the

transient,

overreach

characteristics

have

not

been

limited

this

respect.

TABLE

BASIC

MINIMUM REACH

SELECT

CEX

SHOWN

BELOW

TAPS

CEY52R

_________________-

0.5

—

1.0

1.5

CEX2OA

1.0

2.0

3.0

CEX2OR

APPL

ICATION

The

C[Y52B

relay is

three—phase,

single

zone

mho

distance

relay

that

not

meant

used

itself,

but

rather

designed

used

with

CEX2OA

CEX208

reactance

type

relay.

The

combination

relays

may

used

step-distance

scheme

provide

two

zones

protection

against

phase

faults,

they

may

used

part

high-speed

pilot-relaying

scheme

addition

providing

step-distance

protection.

Figure

illustrates

typical

external

connections

the

relay

when

used

step-

distance

scheme

with

the

CEX2OB

relay.

When

applying

this

relay

for

the

protection

given

circuit,

select

the

highest

basic

minimum

reach

tap

that

will

acconinodate

the

desired

reach

setting.

This

will

insure

that

the

relay

will

operate

the

highest

possible

level

torque.

Since

the

memory

action

the

CLY52B

will

only

effective

for

several cycles

after

the

inception

fault,

the

relay

should

not

relied

provide

time-delay

protection

for

any

fault

that

provides

zero

voltage

the

relay.

The

protection

should

supplemented

other

devices to

detect

this

condition

protection

for

this

contingency

required.

The

section

under

CALCULATION

SETTINGS

provides

worked

example

for

determining

the

settings

the

CEYS2B

typical

application.

Once

the

settings

have

been

calculated,

the

taps

are

set

described

the

section

entitled

TAPPED

AUTO—TRANSFORMERS.

Under

conditions,

should

the

restraint

taps

ever

set

less

than

percent.

RATINGS

The

type

CEY52

relay

covered

these

instructions

available

for

120

volts,

amperes,

cycles

rating.

The

basic

minimum

reach

and

adjustment

ranges

of the

inho

units

are

given

Table

II.

will

noted

that

three

basic

minimum

reach

settings

are

listed

for

the

mho

units.

Selection

the

desired

basic

minimum

reach

setting

for

each

unit

made

means

links

terminal

board

located

the

back

the

relay

(see

Fig.

2).

The

position

the

two

sets

links,

(for

each

unit),

each

identified

A-B

determine

the

basic

minimum

setting

the

mho

units.

The

ohmic

reach

the

inho

units

can

adjust-nd

one

percent

steps

over

4/1

range

for

any

the

basic

minimum

reach

settings

listed

Table

means

autotransformer

tap

leads

the tap

blocks

the

right

side

the

relay.

—--..____

Thnie

utcton

no.t

pu.’tpo-’t-t

-to

eovciz.

detaiJs

c2u.prnnnt

p4ovd

evuuj

sA6e

con.tA,nqenc.y

met

connec,tcon

wLth

n-taitiou,

ope’Litu)e

o’

miLtefltliIrc.

St(!Led

u’ctfte’L

-ui

jo’tnri..tLon

de’u’,d

o.’

I-touLd

pa.’ct

cithvi.

pitobfms

aJLe

wh{cJ!

aiz.C

not

cOvQYted

Lt?etif

the

pu’tcha.ea’-

pwtpoe,

the

rnattc’t

hou.fd

eived

thc

(cvtc’uct

etsc

Conipanu.

the

oxteiit

.‘LequL’ted

the

p’wduc.ta

dci.eailied

eke4n

rnec’-t

appcaIit’e

ANSI,

a,id

IMA

ttz;

hIlt

,‘to

ucJi

asu.’utnce

..a

guJen

w-tk

‘tc.apee.t

tocitf

eode4

azid

icknanet’

cauc

tlzoe

oa-i

L’att’1.

K-4

5495

TABLE

BASIC

MTN

REACH

RANGE

ANGLE

ONE

SECOND

BASIL

REACH

TAPS

(ØN

OHMS)*

(0-N

OHMS)

MAX

TORQUE

RATING

0.5

2.0

600

150

0.5

1,0

1.5

1.0 1.0

4.0

600

150

1.5

6.0

60°

150

1—4

600

150

1-2-3

2-8

600

150

___

*Adjustment

taps

are

set

using

middle

tap

the

factory.

**MaxiIiluIli

torque

angle

can

adjusted

degrees.

The

reach

the

iriho

units

will

increase

approximately

120

percent

its

reach

the

degree

setting.

CONTACTS

The

contacts

the

CEY52

relay

will close

and

carry

momentarily

amperes

direct

current.

However,

the

circuit

breaker

trip

circuit

must

opened

auxiliary

switch

contact

other

suitable

means

since

the

relay contacts

have

interrupting

rating.

TARGET

SEAL-IN

UNIT

The

target

seal-in

unit

used in

the

CEY52

relay

has

ratings

shown

Table

III.

TABLE

III

TARGET

SEAL-IN

UNIT

0.2

AMP

TAP

0.6

AMP

TAP

AMP

TAP

inum

Operating

0.2

amp

0.6

amp

—

2.0

amp

Carry

Continuously

0.4

amp

1.5

amp

3.5

amp

Carry

amps

for

0.03_=

0.5

sec.

4.0

sec.

Carry

10 amps

for

0.25

sec.

4.0

sec.

30.0

sec.

0-C

Resistance

+lOt

7.0

ohms

0.6

ohms

0.13

ohms

Cycle

Impedance

ohms

6.0

ohms

0.53

ohms

OPERATING

PRINCIPLES

The

nihc

units

the

CEY52

relay

are

the

four

pole

induction

cylinder construction

which

torque

‘o:roduced

the

interaction

between

polarizing

flux

and

fluxes

proportional

the

restraining

operating

quantities.

The

sc[.emlii:

connections

the

rho

are

shown

Fia

.a.

Tue

two

side

poles,

oneraized

se—tc-jhuse

c’

tage,

prodoce

the

gel

arzinc

The

flu

the

front

p010,

which

energized

entaq

the

5éiPi

priase

-to-phasa vo1tiçc

ntr

iith

the

polorizing

flux

produce

restrain

tcr

we.

the

rear

pole,

which

•nero1z:

the

two

inc

currents

associated

with

the

seme

zhse-

to-phase

taqe,

interacts

with

the

nolan

produce

operating

torque.

The

torque

the

balance

point

the

wit

car

triereforo

.ne

rxpr’.sed

the

following

equation:

Torque

cos

(0-9)

where:

phase-to—phase

voltage

)

delta

current

12)

angle

maximum

torque

the

unit

power

factor

angle

fault

impedance

design

constant

K—4

prove

that

the

equation

defines

mho

characteristic

divide

both

sides

and

transpo.e.

The

equation

reduces

to:

cos

(

or:

cos

(

Thus,

the

unit

will

pick

constant

component

admittance

fixed

angle

depending

the

angle

maximum

torque.

Hence,

the

name

mho

unit.

CHARACTER

ISTICS

MHO

UNIT

Impedance

Characteristic

The

impedance

characteristic

mho

unit

shown

Fig.

for

the

one

ohm

basic

minimum

reach

setting

maximum

torque angle

degrees.

This

circle

can

expanded

means

the

mho

taps

the

autotransformer

tap

block

providing

range

4/1

changing

the

basic

minimum

reach

the

unit

means

of the

links

the

rear

providing

total

range

12/1.

The

circle

will

always

pass

through

the

origin

and

have

diameter

along

degree

impedance

line

equal

the

ohmic

reach

the

unit

expressed

the

following:

(lo0

Ohmic

Reach

tap

setting

()

where:

njin

basic

mm.

phase-to-neutral

ohmic

reach

the

unit.

The

angle

maximum

torque

the

mho

unit

can

adjusted

degrees

(see

SERVICING)

with

resulting

increase

reach

approximately

120

percent

its

reach

degrees

for

the

same

tap

setting.

Ths

shown

the

dotted

characteristic

Fig.6.

irec

.iunal Action

TihO

unit

carefully

adjusted

have

correct

directional

action

under

steady—state,

low

voltage

low

current

conditions.

For

faults

the

non-tripping

direction,

the

contacts will

remain

open

:eri

volts

between

and

amperes.

For

faults

the

tripping

direction,

the

unit

will

its

con

tact:

between

the

current

limits

in Table

for

the

three

basic

minimum

reach

settings

the

voltage

shown.

This

adjustment

function

of the

core

(inner

stator)

position

and

should

any

adjustment

‘tecessary

see

SERVICING.

TABLE

CURRENT

RANGE

FOR

BASIC

MIN

*VOLTS

CORRECTOIRECTIONAL

REACH

TAP

ACTION

2.0

vol

amps

1.0

2.0

volts

amps

1.5

2.0

volts

4.5

amps

2.0

volts

—

amps

2.0

volts

amps

*The

unit

set

the

factory

the

middle

tap

(lii

for

0.5/1/1.5

unit

and

for

1/2/3

ohm

unit)

for

correct

directional

action

over

the

indicated

current

range.

variation

+10

percent

can

expected

the

values

listed.

For

performance

during

transient

low-voltage

conditions,

where

the

voltage

was

normal

120

volts

prior

the

fault,

refer

the

paragraph

below

memory

action.

GEK-45495

linderreach

reduced

voltaqe

the

ohmic

value

which

the

niho

unit

will

operate

may

somewhat

lower

than

the

LJICulat(d

value.

This

pullback

reduction

reach

shown

Fig.

for

the

and

ohm

basic

miiInuI1

reach

settings.

The

unit

reach

percent

setting

plotted

against

the

three—phase

fault

cur

liree

ohmic

reach

tap

settings.

Note

that

the

fault

current

scale

changes

with

the

basic

r,iniiuuw

,L:ing.

The

itho

unit

will

Operate

for

all

points

the

right

the

curve.

The

steady-state

curves

rig.

wirer

determined

tests

performed

with

voltage

supplied

the

relay

before

the

fault

W.i

‘pHed.

The

dynamic

curves

were

obtained

with

full

rated

voltage

120

volts

supplied

the

relay

before

laul

mis

applied.

Memory

Action

[he

dynamic

curves

Fig.

illustrate

the

effect

memory

action

the

who

unit

which

maintains

the

polorizing

flux

for

few

cycles

following

the

inception

the

fault.

This

memory

action

particularly

effective

low

voltage

levels

where

enables

the

who

unit

operate for

low

fault

currents.

This

can

nost

forcefully

illustrated

for

zero

voltage

fault

referring

Fig.

zero

voltage

fault

must

time

relay

bus

and

therefore,

protect

for

this

fault,

imperative

that

the

relay

reach

zero

percent

its

setting.

Fig.

shows

that

the

who

unit,

under

static

conditions,

will

not

see

fault

zero

percent

the

relay

setting

regardless

the tap

setting.

However,

under

dynamic

conditions

when

the

memory

action

effective,

Fig.

shows

that

mho

unit

with

three-ohm

basic

minimum

reach

and

100

percent

tap

setting

will

operate

greater

than

1.6

amperes.

The

memory

action

will

the

contact

for

only

short

period

time

and

therefore,

memory

action

cannot

relied

the

tripping

delayed.

When

the

relay

used,

second

zone

relay

and

tripping

delayed

the

zone

setting

the

type

RPM

relay,

the

static

characteristic

should

used.

For

this

application

operate

for

nearby

faults

and

there

will

sufficient

voltage

give

tripping

without

depending

memory

action.

Operating

Time

The

operating

time

the

who

unit

determined

number

factors

such

the

basic

minimum

reach

setting

of the

unit,

fault

current

magnitude,

ratio

fault

impedance

relay

reach,

and

magnitude

relay

voltage

prior

the

fault.

The

curves

Fig.

are

for

the

condition

rated

volts

prior

the

fault.

Time

curves

are

given

for

four

ratios

fault

impedance

relay

reach

setting.

all

cases,

the

rnho

taps

were

the

100

percent

position

and

the

angle

maximum

torque

was

set

degrees

lag.

TAPPED AUTO-TRANSOFRMERS

(See

Fig.

The

ohmic

reach

of the

mho

units

may

adjusted

means

taps

the

two

auto-transformers.

Each

auto-transformer

has

two

windings.

One

winding

tapped

percent

steps

from

percent

percent.

The

other

winding

tapped

percent,

percent

and

percent.

The

desired

tap

setting

made by

the

proper

location

of the

leads

marked

No.

and

the

jumper

con

necting

the

two

windings

the

auto-transformer.

Note

that

the

0—5

percent

winding

may

added

subtracted

from

the

15-95

percent

winding.

The

tap

setting

required

protect

zone

ohms

long,

where

positive

phase

sequence

phase-to-

neutral

impedance

expressed

secondary

terms,

determined

the

following

equation:

(100)

(Mm.

Ohms

Setting)

Cos

(—@)

Tap

Setting

=———

_______——______

______

where:

Power

factor

angle

fault

impedance

Angle

maximum

torque

the

unit

:Xj

ale

TAP

SETTING

DESIRED

Set

one end

jumper

lead to

percent.

Set

the

other

end

percent.

Set

No.

percent.

cite

the

percent

setting

the

0—5

percent

winding

subtracts

from

the

percent

setting)

:xample

TAP

SETTING

DESIRED

Set

one

end

of jumper

lead

percent.

Set

the

other

end

percent.

Set

No.

percent.

m,Nate

the

percent

setting

the

0-5

percent

winding

adds

the

percent

setting.)

GEK-45495

CIRCUIT

FREQ

P.F.

WATTS

VARS_—

The

potential

burden

of the

niho

unit

maximum

when

the

restraint

The

restraint

circuit

burden

and

hence

the

total

relay

burden

will

setting

less

than

100

percent.

The

potential

burden

tap

settings

less

than

100

percent,

can

formula.

jb)

rTap

Setting]

100

The

terms

jb)(c

jd),

etc.

represent

the

burdens

the

mho

unit potential

circuit

expressed

watts

and

vars

with

their

taps

100

percent.

The

values

these

terms

are

given

Table

VI.

jb)

(wattc

vars)

for

restraint circuit

and

jd)

(watts

vars)

for

polarizing

circuit.

CALCULATION

SETTINGS

Tcride

230kv

transmission

line

miles

long

having

phase—to—neutral

impedance

of:

0.14

0.80

ohms

per

nile,

Zpri

(0.14

jO.80)

j40

ohm

total

Ratio

sec

pri

Ratio

j40.Q)

120

0.42

j?.a

ohms

2000

Zsec

2.43

80.5°

ohms

BURDENS

CURRENT

CIRCUITS

The

maximum

current

burden

imposed

each

current

transformer

amperes

listed

Tah1€

TABLE

AMPS

CYCLES

This

data

for

the

3.0

ohm

cycles will

lower.

POTENTIAL

CIRCUITS

P.F.

WATTS

.043 .026

0.86 1.08

1.25

The

maximum

potential

burden

basic

reach

tap

setting

for

cycles.

The

burden

for

the

lower

tap

setting

imposed

each

potential

transformer

120

volts

listed

Table

VI.

TABLE

Polarizing

Restraint

Polarizing

Restraint

1534

1060

2200

1160

1580

1600

.00

0.55

1.00

0.73

9.4

4.2

6.5

4.3

0.1

6.3

0.4

5.9

9.4

7.6

6.5

7.2

tap

set

for

100

percent.

decrease

when

the

restraint

tap

calculated

from

the

following

Ratio

230,000/115

2000/1

600/5

120/1

K-4

Assume

that

the

CEY52

used

conjunction

with

CEX2OA

provide

second

zone

protection

and

uesired,

after

considering

the

effects

infeed,

set

the

relay

reach

3.64

/80.50

secondary

ohms.

For

this

application

the

three-ohm

basic

minimum

reach

setting

should

used.

The

ohmic

reach

equation,

given

the

section

under

CHARACTERISTICS-

TAPPED AUTO-TRANSFORMERS

used.

(100)

(Mm.

ohms)

Cos

(0—9)

Percent

Tap

Setting

_________

______

3.54

Minimum

Ohms

3.0

deg.,

3.6

dog.

750

80.5°

(100)

(3.6)

Cos

(80.5

—

75)

Percent

Tap

Setting

_____________________________

3.64

Percent

Tap

Setting

CONSTRUCTION

The

type

CEYS2

relays

are

assembled

deep

large

size,

double-end

(L2D)

drawout

case

having

studs

both

ends

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

connection

plug

which

completes

the

circuits.

The

outer

blocks

attached

the

case

have

the

studs

for th’

external

connections

and

the inner

blocks

have

the

terminals for

the

internal

connections.

Every

circuit

the

drawout

case

has

auxiliary

brush,

shown

Fig.

provide

adequate

overlap

when

the

connecting

plug

withdrawn

inserted.

Some

circuits

are

equipped

with

shorting

bars

(see

internal

connections

in Fig.

10)

and

those

circuits,

especially

important

that

the

auxiliary

brush

make

contact

indicated

Fig.

with

adequate

pressure

prevent

the

opening of

important

inter

locking

circuits.

The

relay

mechanism

mounted

steel

framework

called

the

cradle

and

complete

unit

with

all

leads

terminated

the

inner

block.

This

cradle

held

firmly

the

case

with

latch

both

top

and

bottom

and

guide pin

the

back

of 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

plugs

place.

The

target

reset

mechanism

part

the

cover

assembly.

The

relay

case is

suitable

for

either

semi—flush

surface

mounting

all

panels

two

inches

thick

and

appropriate

hardware

available.

However,

panel

thickness

must

indicated

the

relay

order

insure

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,

from

other

sources;

the

relay

drawn

out

and

replaced

another

which

has

been

tested

the

laboratory.

Pies.

aid

show

the

relay

removed

its

drawout

case

wth

all

major

components

ider.ti

fiec

‘abo1s

usea

identify

nircuit

components

are the

arie

those

which

appear

the

interncl

connection

nagram

Fip.

10.

The

ralav

icaludes

th’en

similar

rho

suhassembi:

Cienents

mojntcd

the

front

the

cradle

ann

a’

ito

trrisforrners

and

tap

blocks

mounted

‘bc

back

-‘

the

cradle.

See

and

The

rio

sub-a;seIHbly

includes

the

fOL

i—pole

ossoc

ated

circuit

cunipcnents.

heostt.

R23

ssed

settinq

tie

angle

ma.’inlui

torce

inS

rrnostats

811

R2,

813

used

settinj

the

basic

minmJm

reach

car

adjusted

from

the

front

the

relay.

The

tap

blockS

for

changirg

the

basic

r;inioum

reach

units

are

mounted

the

back.

The

relay

most

removed

from

its

case

make

the

settings.

RECEIVIND,

HANDLING

AND

STORAGE

hese

relays,

when

not

included

part

control

panel, will

shipped

cartons

designed

orotect

them

against

damage.

Irnediately

upon

receipt

relay,

examine

for

any

mage

sustained

K-4

5495

transit.

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

of the

parts

are

injured

the

adjustments

disturbed.

the

relays

are

not

installed

ininediately,

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

nside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay.

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay,

inspection

and

acceptance

tests

should

made

insure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed.

the

exwiination

test

indicates

that

readjustment

necessary,

refer

the

section

SERVICING.

ViSUAL

INSPECTION

Check

the

nameplate

stamping

insure

that

the

model

number

and

rating

the

relay

agree

with

the

requisition.

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

recomended

that

the

mechanical

adjustments

in Table

VIII

checked.

There

should

noticeable

friction

the

rotating

structure

of the

units.

Make

sure

control springs

are

not

deformed

and

spring

convolutions

not

touch

each

other.

With

the

relay

well

leveled

its

upright

position

the

contacts

all

three units

must

open.

The

moving

contacts

the

units

should

rest

against

the

backstop.

The

armature

and

contacts

the

seal-in

unit

should

move

freely

when

operated

hand.

There

should

least

1/32

inch

wipe

the

seal—in

contacts.

Check

the

location

the

contact

brushes

the

cradle

and

case

blocks

against

the

internal

connection

diagram

for

the

relay.

TABLE

VIII

CHECK

POINTS

MHO

UNITS

Rotating Shaft

End

Play

.010

.015

inch

Contact

Gap

.145

.155

inch

Contact

Wipe

.003

.005

inch

____

L[CRJCAL

CHECKS

WHO

UNiTS

e:-

adde

with

e1a

case.

Before

any

electrical

checks

are

made

the

mho

units

the

a.•

sho

cernected

shown

Fig.

an•

allowed

warm

for

approximately

minutes

with

the

s:er

s’r

i1ane

energed

rateu

vcltiqe

and

the

restraint

taps

set

100

percent.

The

units

•

r.r

rTJ-:’

.,.

factory

adjustment

and

rechecied

when

col

will

tend

underreach

per

ibratd

meters

are,

:ovrse,

esential

check

the

fctory

sOttinU

Lnd

calibration

means

of the

test

described

in the

fol

wit-c

;etion-.

mho

uitc

were

carafully

adjusted

the

factory

and

not

advisable

disturb

;ese

setiini

r1ecs

the

follewing

checks

indicate

conclusively

that

the

settings

have

been

disturbed.

•idjtrnentc

necessarY

refer

the

section

SERVICING

for

the

recommended

procedures.

Test connections

for

checking

correct

mho

unit

operation.

(a)

Control

Spring

Adjustment

sure

that

the

relay

level

its

upright

position.

Leave

the

relay

connected

shown

Fig.

and

leave

the

restraint

taps

the

100

percent

position.

GEK-45495

Use

the

following

procedure

checking

each

unit.

With

the

current set

five

amperes

and

the

voltage across

relay

voltage

studs

120

volts,

set

the

phase

shifter

that

the

phase—angle

meter

reads

the

value

shown

Table

for

the

unit

being

tested,

that

current

lags

voltage

angle

equal

the

angle

maximum

torque

the

unit.

Now

reduce the

vol

taqe

the

low

test

voltage

and

reduce

the

cur

rent

dbout

two

amperes.

Gradually

increase

the

current:

until

the

contacts

the

unit

just

close.

This

should

occur

between

the

currents

listed

Table

IX.

(b)

Clutch

Adjustment

Toe

mho

units

include

high-set

clutch

between

the

cup

and

shaft

assembly

and

the

moving

contact

prevent

damage

during

heavy

fault

conditions.

These

clutches

have

been

set

the

factory

slip

approximately

40-60

grads

applied

tangentially

the

moving

contact.

This

can

best

checked in

the

field

terms

volt-amperes

the

following

method.

ise

the

connections

Fig.

and

set

the

phase

shifter

that

the

phase—angle

meter

reads

the

value

Table

for

the

unit

checked,

120

volts

and

amperes.

Disconnect

the

No.

restraint

tap

leads

from

the

tap

block

and

set

the

mho

units

for

maximum

ohm

basic

minimum

reach.

With

the

voltage

across

relay

studs

set at

120

volt

increase

the

current until

the

clutch

just

slips.

This

should

occur

between

and

amperes

for

the

unit

just

above

amperes

for

.5s2

unit.

(c)

Ohmic

Reach

With

the

relay

still

connected

shown

Fig.

and

the

restraint

tap

leads

in the

100

percent

position,

make

connections

shown

Table

and

set

the

phase

shifter

that

the

phase-angle

meter

reads

the

angle

shown

the

table

for

the

unit

checked.

Now

reduce

the

voltage

to the

value

shown

Table

and

increase

the

current

gradually

until

the

normally

open

contacts

the

unit

just

close.

This

should

occur

within

the

limits

shown.

Note

that

the

screws

the

transactor

tap blocks

are

set

the

position

which

gives

the

basic

minimum

reach

shown

the

table.

Note

that

for

the

test

conditions,

the

mho

units

see

phase-to-phase

fault

twice

the

basic

minimum

reach.

The

relays

are

normally shipped

from

the

factory

with

the

basic

minimum

reach

adjustment

taps

the

units

the

intermediate

setting,

that

the

ohm-tap.

the

units

are

set

either

the

remain

ing

basic

minimum

reach

taps,

ohms,

the

basic

reach

the

units

will

within

percent

the

nameplate marking.

(d)

Angle

Maximum

Torque

For

checking

the

angle

maximum

torque

the

connections of

Fig.

will

used

with

the

restraint

tap

leads

set at

100

percent

position,

and

with the

voltage

set

the value

shown

Table

for

the

unit

checked.

The

minimum

reach

taps

should

set

the

2—ohm

position.

ciecking

the

mho

units

the

following

procedure

should

used.

First

set

the

phase

shifter

tat

the

phase-angle

meter

reads

330

degrees.

Note

that

while

the

phase

angle

being

set,

the

currert

should

mDeres

and

the

voltage

120

volts.

Now

set

the

voltage

the

value

shown

Table

Yl;

1’crease

‘ie

current

owly

until

the

nho

unit

picks

up.

The

pickup

current

should

within

the

imits

cnown

the

table.

:10w

rcset

the

phase

angle

270

degrees

and

again

check

the

current

required

pick

the

mhci

unit

Tii

carren:

should

fall

within

the

same

limits

for

the

330

degree

check.

Connect

the

relay

follows:

__--

CONNECT

LEAU

RELAY

UNIT

JUMPER

LOCATION

TUDSA

11)

STUDS

LEAD

TOP

l-2

14-15

13—16-17

6-8-10

MIDDLE

F-

13-16-17 18-19-20

6-8-10

bTTl

1L-19-20

l4-15

6-8-10

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