GE CEYG51A Manuale utente

GEK-26423D

INSTRUCTIONS

GROUND

DISTANCE

RELAY

TYPE

CEYG51A

Protection

and

Control

205

Great

Valley

Parkway

Maivern,

19355-1337

GEK-26423

CONT

NTS

PAGE

iNTRODUCTION

APPLICATION

RATINGS

Contacts

OPERATINO

PRINCIPLES

CHARACTERISTICS

Pickup

Operating

Time

Burden

CALCULATION

SETTINGS

CONSTRUCTION

RECEIVING,

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

Visual

Inspection

Mechanical

Inspection

Electrical

Tests

iNSTALLATION

PROCEDURE

Relay

Settings

Mechanical

Checks

Electrical

Checks

PORTABLE

TEST

EQUIPMENT 11

SERVICING

Restraint

Circuit

Angle

Adjustment

Directional

Characteristic

Maximum

Torque

Angle

Pickup

Clutch

Adjustment

RENEWAL

PARTS 16

APPENDIX

MINIMUM

PERMISSIBLE

REACH

SETTING

FOR

THE

CEYG51A

Zero

Sequence

Current

Compensation

With

Zero

Sequence

Current

Compensation

APPENDIX

MAXIMUM

PERMISSIBLE

REACH

SETTING

FOR

THE

CEYGS1A

Zero

Sequence

Current

Compensation

APPENDIX

III

MAXIMUM

PERMISSIBLE

REACH

SETTING

FUR

THE

CEYGS1A

With

Zero

Sequence

Current

Compensation

GEK-26423

GROUND

DISTANCE

RELAY

CEYG51A

RELAY

INTRODUCTION

The

CEYGS1IX

three

phase,

high

speed,

single

zone,

mho

type,

directional

distance

ground

relay.

consists

three

single-phase

units

one

L2—D

case

with

facilities

for

testing

one

unit

time.

One

target

and

seal-in

unit

provides

indication

operation

for

all

three

distance

units.

The

transient

over

reach

characteristic

the

CEYG51A

relay

has

not

been

limited

the

point

where

suitable

for

use

first-zone

relay.

The

relay

waS

specifically

designed

for

use

overreaching

device

directional

comparison

and

transferred

tripping

schemes.

Figure

shows

the

internal

connections.

APPL

CAT

ION

The

CEYG51A

ground

mho

relay

applied

the

primary

ground

relay

directional

comparison

and

per

missive

overreaching

transferred

tripping

schemes,

employing

separate

primary

and

separate

backup

protec

tion.

The

ground

rnho

units

the

CEYG5IA

relay

are

specifically

designed

detect

single

phase

ground

faults.

this

end

they

are

supplied

with

quadrature voltage

polarization.

Thus,

the

polarizing

voltage

will

quite

high

and

the

relay

will

have

high

operating

torque level

even

very

line

ground

faults.

For

this

reason, these

units

are

not provided

with

memory

action.

These

ground

niho

units

will

also

respond

three

phase

faults.

this

objectionable,

the

relay

can

made

unresponsive

any

faults

not

involving

ground

simply

adding

non—directional zero

sequence

fault

detector.

The

ground

mho

units

are

provided

with

separate

current

circuits

for

zero

sequence

current

compensa

tion.

tapped

auxiliary

current

transformer

used

obtain

the

proper

ratio

compensation.

When

zero

sequence

current

compensation

used,

the

ground

iiho

unit

has

essentially

the

same

reach

single

phase

ground

faults

three

phase

faults.

zero

sequence compensation

NOT

used, the

ground

niho

unit

reach

considerably foreshortened

single

phase

ground

faults.

See

Appendix

for

the

minimum

permissible

reach

settings

under

both

conditions.

directional

comparison

schemes,

two

CEYG51A

relays

connected

back—to-back

are

required

each

terminal.

These

relays

operate

conjunction

with

carrier

channel to

provide

high

speed

protection

against

all

single

phase to

ground

faults

the

protected

line

section.

One

relay

acts

Stop

carrier

and

trip

for

internal

faults

while

the

other

initiates

carrier

blocking

external

faults.

zero

sequence

current

compensation

used

the

carrier

stopping

and

tripping

units,

should

also

used

the

carrier

starting

units.

This

will

facilitate

the

unit

settings

and

insure

that

both

units

that

must

coordinate

will

operating

the

same

torque

level,

any

event,

the

carrier

starting

unit

should

set

sensitively

possible.

This

will

tend

increase

security

since

the

presence

carrier

signal

will

block

tripping.

permissive

overreaching

transferred

tripping

schemes,

one

CEYG51A

relay

required

each

ter

minal.

acts

combined

transferred

trip

initiating

and

permissive

relay for

ground

faults

the

protected

line

section.

The

choice

whether or

not to

use

sequence

current

compensation

depends

upon

the

protected

line

length

and

system

conditions.

When

zero

sequence

current

compensation

NOT

used,

the

ground

mho

unit

reach

required

may

about

times

the

positive

sequence

impedance

of the

line

order

to provide

the

proper

coverage.

This

then

tends

make

the

ground

mho

unit

sensitive

operation

load

con

ditions

power

swings.

The

use

zero

sequence

current

compensation

reduces

the

necessary

ground

mho

unit

reach

setting

approximately

1.25

times the

positive

sequence

impedance

the

line

and,

thus,

minimizes

its

response

load

power

swings.

This

true

provided

there

little

mutual

pedance

present

from

parallel

line.

These

nstroctions

not

purport

cover

all

details

variations

equipment

nor to

provide

For

eeerc

poss:ble

contanJencj

met

connection

with

installation,

operation

or maintenance.

Should

furtn-r

information

desired

should

particular

problems

arise

which

are

not

covorci

sufficientlq

for

purchaser’s

purposes,

the

matter

should

referred

to the General

Electric

Ccmpant.

extent

,eau:red

the

products

descrrhed

herein

meet

applicable

?.ESI,

IEEE

and

.S1IMA

standards;

:ot

sucn

-scranc.

;iven

with

respect

local

codes

and

ordinances

because

he;

varo

rcatly.

GEK-26423

Whether

not

zero

sequence

current

compensation

used,

the

ground

mho

units

may

subject

correct

operation

ground

faults

immediately

behind

the

relay

terminals.

This

will

dependent

upon

the

line

impedance

and

system

conditions.

nay

necessary

mit

the

mho

unit

reach

setting

order

avoid

this

false

tripping.

Appendix

gives

the

limiatations

the

mho

unit

reach

setting

when

zero

sequence

current

compensation

NOT

used

Appendix

ill

gives

the

limitdtions

the

inho

unit

reach

setting

when

zero

sequence

current

compensation

used.

The

system

conch

tions

which

requ

the

tdtion

the

uho

unit

reach,

described

Appendices

and

Ill

are

rather

unusual

They

occur

when

the

zero

sequence

current

contribution

over

the

line

fault

behind

the

relay is

larger

than the

positive

sequence

current

contribution.

the

reach

the

unfaulted

phase

units

the

non-trip

direction

application

limitation,

zero

sequence

directional

overcurrent

relay

(CFPG16A) nay

used

supervise

the

CEYG51

operation.

This

will

permit

tripping

only

when

the

fault

the

forward

direction.

The

external

connections

are

shown

Figure

Since the

CEYG51A

extended

range

relay

with

three

basic

minimum

reach

settings,

the

best overall

performance

will

obtained

the

highest

basic

minimum

reach

tap

setting

that

will

accommodate

the

sired

setting

used.

RATINGS

The

Type

CEYG5IA

relays

covered

these

instructions

are

available

with

potential

circuits

rated

for

operation

wye-wye

connected

potential

transformers

which

supply secondary

voltage

120

volts

phase-

to-phase.

Current

coil

ratings

and

ohmic

ranges

are

tabulated

below:

BASIC

MIN.

RANGE

CONTIN.

ONE

SEC.

OHMIC

REACH

OHMIC

REACH

CURRENT

RATING

CUR.

RATING

(0-N

OHMS)

(0-N

OHMS)

AMPERES

—

AMPERES

1/2/3

225

0.5/1.0/1.5

0.5

225

The

ohmic

reach

the

angle

maximum

torque of

degrees

lag,

and

can

adjusted

percent

steps

means

tapped

autotransformer.

will

noted

that

three

basic

minimum

reach

settings

are

listed

for

the

mho

units.

Selection

the

desired

basic

minimum

reach

made

means

links

terminal

boards

located

rear

the

relay.

The

positions

the

two

sets

links,

(for

each

unit),

each

identified

A-B

determine

the

minimum

ohmic

reach

setting

follows:

MINIMUM

OHMIC

REACH

SETTING

(OHM

PHASE-TO-NEUTRAL)

CONTACTS

The

main

circuit-closing

contacts

the

re1a

will

and

carry

amperes

momentarily

for

tripping

duty

control voltages

250V

less.

The

circuit

breaker

trip

coil

should,

however,

always

opened

auxiliary

switch or

other

suitable

means.

the

tripping

current

exceeds

amperes,

tripping

relay

should

used.

The

current

carrying

rating

the

main

contacts

determined

the

tap

setting

the

seal—in

coil

shown

Table

TABLE

TARGET

AND

SEAL-IN

UNIT

2.0 0.6

0.2

——

Amp

Tap

A;np

Tap

—

Amp

Tap

I—C

Resistance

0.13

Ohms

0.6

Ohms

Carry

Continuously

3.5

Amps

1.0

Amps

0.35

Amps

Carry

Amps

for

Secs.

0.5

Secs.

Carry

Amps

for

0.2

Secs.

GEK-26423

The

normally

closed

contacts

between

terminals

and

will

close,

carry

continuously,

interrupt

0.3

amperes

non—inductive

circuits

250V

DC.

OPERATING

PRINCIPLES

The

inhu

type

units

the

CEYGS1A

relay

are

the

four-pole

induction-cylinder

construction

(see

Fig.

with

schematic

connections

shown

Fig.

The

two

side

poles,

which

are

energized

the

phase-to-phase

voltage

quadrature

with

the

phase-to—neutral

voltage

the

protected

phase,

produce

the

polarizing

flux.

The

flux

the

front

pole,

which

energized

percentage

the

phase-to-neutral

vol

tdye

the

protected

phase,

interacts

with

the

polarizing

flux

to produce

restraint

torque.

The

flux

the

rear

pole,

which

energized

the

line

current

the

protected

phase,

interacts

with

the

polar

izing

flux

produce

operating

torque.

The

torque

the

balance

point

for

the

phase

starting

unit

can,

therefore,

expressed

the

following

equation:

Torque

KIaEbc

COS

((

-30)

—

TEEb’

sin

(1)

where:

design

constant

Phase—A-to-neutral

voltage

the

relay

location

Ebc’

Phase

voltage

(Eb

the

relay

‘a

Phase

current,

the

relay

location

Angle

which

leads

Ebc’

(900

for

balanced

3-phase

condition)

Restraint

tap

setting

Angle

which

‘a

leads

Ebc

CHARACTER

1ST

The

operating

characteristics

the

mho

units

the

CEYG51A

relay

may

represented

the

R—X

impedance

diagram

shown

Fig.

should

noted

that

these

steady-state

characteristics

are

for

rather

specific

fault

conditions

described

below:

The

inho

unit

has

circular

characteristic

which

passes

through

the

origin

the

R-X

diagram.

The

diameter

passing

through

the

origin

defines

the

angle

maximum

torque

the

unit,

which

occurs

when

line

current

(Ia

for

example)

leads

the

quadrature

polarizing

voltage

(Ebc

for

example)

30°.

Since

there

essentially

phase

shift

the

line—to—neutral

voltage

for

single-phase-to-ground

fault,

this

maximum

torque

angle

(i.e.

maximum

reach

angle)

occurs

when

the

line current

lags

the

phase—to-neutral

voltage

600,

which

the

condition represented

Fig.

The

diameter

the

impedance

circle

would

nomally

considered

the

ohmic

reach

the

unit,

which

would

the

basic

minimum

reach with

the

tap leads

100

percent.

However,

the

niho

unit

not

compensated

not

accurate

distance

measuring

until

except

3-phase

faults,

for

the

special

case

single-phase—to-ground

faults

where

the

zero-sequence

impedance

the

fault

equal to

the

positive

sequence

impedance

the

fault.

Instructions

are

given

Appendices

and

III

for

selecting

reach

setting.

The

ohmic

reach of

the

mho

unit

can

extended

reducing the

percentage

the

fault

voltage

applied

the

restraint

circuit,

that

setting

the

tap

leads

lower

percentaoe

position

the

tap block.

(Zi)

100

Ohmic

ReQch

Tap

Setting

()

(5)

K—2

The

ohmic

reach

obtained

from

equation

(5)

assumes

that line

angle

and

maximum

torque

angle

are

equal

(600).

The

reduced

reach

line

angles

other

than

600

can

obtained

multiplying

the

reach

obtained

from

equation

(5)

cos

(60-0)

where

the

line

angle.

PICKUP

The

operating

torque

will

the

contacts

when

the

fault

current

certiri

direction

and

ufficient

magnitude to

overcome

the

restraint

torque.

The

operating

torque

3-phase

faults

maxi

mum

for

fault

currents

which

lag

the

unity

power

factor

position

degrees

and

reliable

down

one

percent

voltage

with

currents

tabulated

below:

MINIMUM OHMIC

REACH

SETTING

CURRENT

RANGE FOR

RELIABLE

OPERATION

(0-N

OHMS)

0.5

18-60

1.5

—

single-phase-to-ground

faults

the

quadrature

polarizing potential

will

remain

quite

high

with

the

result

that

the

relay

will

operate

considerably

less

current

than

tabulated.

For

example,

with

one

percent

restraint

voltage

and

120

volts

polarizing

the

unit

will

operate

with

less

than

ampere

operating

current

for

the

3-ohm

minimum

reach

setting.

OPERATING

TIME

For

typical

operating

time

characteristics

see

Figure

13A

and

138.

BURDEN

The

burden

imposed

the

potential

transformers

the

type

CEYG51A

relay

with

the

restraint

tap

set

100

percent

given

below:

Basic

Rated

Polarizing

Circuit

Restraint Circuit

Ohms

Freq

Watts

Vars

Volts

Watts

Vars

30 60

120

10.1

8.88

13.5

2.7

4.0

4.8

0.5

120

10.1

8.88

13.5

0.9

1.6

1.8

30 50

120

8.41

7.38

11.2

1.7

3.0

3.4

I-f

the

restraint

tap

reduced,

the

burden

the

restraint

circuit

given

the

following

equation:

Watts

*(2

VARS(i”)

where

Watts

Restraint

circuit

watts

from

table

above.

VARS

Restraint

circuit

Vars

from

table

above.

Tap

percent.

GEK-26423

Basic

Rated

3-4,

5-6,

7-8

Circuit

9-10

Circuit

Ohms

Freq.

0.070

0.040

0.080

0.210

0.120

0.240

0.5

0.007

0.005 0.008

0.021

0.013 0.024

0.058 0.033

0.067

0.175

0.100 0.200

NOTE:

Above

data

for

the

mho

units set

their

maximum

ohmic

reach

taps.

The

burden

for

the

lower

reach

tap

settings

will

less

than

the

tabulated

burdens.

CALCULATION

SETTINGS

applying

the

relay

particular

line

and

system, the

limitations

outlined

under

APPLICATION

fre

quently

not

materialize.

Therefore,

recommended

that

the

initial

calculations

and

below

followed

determine

what

final

calculations

may

necessary

and

how

the

relay

may

applied.

Determimimme

zero

sequence

current

compensation

is required.

This

will

depend

upon

evaluation

the

necessary

rnho

unit

tap

settings

and

the

relation

of the

resulting

mho

characteristic

with

the

line

power

loadings

and

power

swings.

See

Appendix

equations

‘b

and

Determine

there

limitation

the

application

for

incorrect

operation

faults

behind

the

relay

terminal.

When

zero

sequence

current

compensation

t.{Qi

used:

equal

less

than

further

evaluation

need

made.

See

Appendix

II,

equations

ha,

hib

and

tIc.

When

zero

sequence

current

compensation

used:

(3K

equal to

less

than

further

evaluation

need

made. See

Appendix

III,

equations

lIla,

hlIb

and

Ihic.

neither

nor

above

applicable,

evaluate

the

equations

either

Appendix

III

determine

necessary

use

the zero

sequence

directional

overcurrent

supervising

lay,

Type

CFPH16A.

The

following

calculations

are

made

example

determining

the

actual

tap

settings

used.

Consider the

protected

line

between

breakers

and

the

portion

system

shown

Fig.

Assume

the

following

characteristics:

24.0

/790

primary

ohms

72.0

/750

primary

ohms

14.4

/75°

primary

ohms

Ratio

600/5

Ratio

1200/1

Secondary

Ohms

Ratio

Primary

Ohms

Ratio

2.4

/79°

0.47

j2.36

secondary

ohms

’

7.2

/75°

1.9

j6.95

secondary

ohms

Zom

1.4

/75°

0.36

jI.35

secondary

ohms

Checking

Appendix

first

establish

the

maximum

tap

setting

that

would

still

permit

the

CEYG5IA

breaker

detect

single

phase

ground

fault

(F2)

the

remote

bus,

Equation

should

used.

The

burdens

imposed

the

current

transformers

the

current

circuits

are

given

below:

GEK-26423

Assume

for

this

fault

that

system

study

yields

the

following

quantities.

0.17

0.20

13.7

secondary

amperes

based

600/5

CTs

4.1

secondary

amperes

10’

-0.88

secondary

amperes

based

the

protected

line

ratio

600/5.

Note

the

negative

sign

because

flows

the

opposite

direction

the

parallel

line

from

that

in which

flows

the

protected

line

B).

790

Substituting

these

values

and

the

values

impedance

assumed

above

into

equation

Appendix

obtain:

Cos

(60-79)

(7.2

-2.4)(0.17)

(1.4)(-0.88)

(0.4

0.17)

13.7

0.204K

The

value

could

obtained

for

all

three

basic

minimum

reach

settings.

However,

the

highest

one

should

used.

For

the

three

ohm

basic

reach

settings

300.

Thus,

for

this

basic

tap

setting

the

restraint

tap

should

larger

than:

0.204K

percent

Consider

now

ground

fault

immediately

behind

the

relay.

Appendix H

indicates

the approach

calculate

the

maximum

safe

reach

setting

eliminate

the

possibility

incorrect

operation

single

double

phase

ground

faults

this

location.

Assume

that

system

study

yields

the

following

system

constants:

0.27

0.11

0.875

secondary

ohms

1.05

/780

secondary

ohms

1.2

Using

the

ohm

basic

minimum

tap

settings

established

above

and

evaluating

equations

ha,

JIb

and

TIc

Appendix

II,

the

minimum

permissible

values

tap

setting

are

tabulated

below.

QUANTITY

VALUE

0.875

/82°

1.05

/780

1.2

0.11

0.27

100

123°

82°

(Equation

ha)

-10.5 Percent

(Equation

JIb)

-18

Percent

(Equation

lIc)

-14.5

Percent

GEK-26423

Since

all

the

values

the

above

table

are

negative,

these

equations

impose

restrictions

the

tap

setting

for

this application.

Thus,

the

relays

may

set

the

range of

percent.

Since

the

percent

setting

will

insure

that

the

relay

will

reach

only

to the

remote

bus,

lower

setting

should

used.

desirable

set

the

relay

reach

least

percent

beyond

the

remote

terminal.

Thus,

for

percent

additional

reach

the

restraint

tap

setting

should

be:

percent

Set

tap

percent

These

same

calculations

should

repeated

for

the

relays

the

remote

end

the

line

terminal

the

application

for

directional

comparison

carrier,

will

also

necessary

determine

the

set

tings

of the

carrier

starting

CEYG51A

relays

both

terminals.

The

carrier

start

relay

settings

should

least

1.25

times

the

setting

the

tripping

relay at

the

remote

terminal.

This

will

insure

that

the

carrier

starting

relay

the

rear

terminal

will

outreach

the

carrier

tripping

relay at

the

remote

terminal

and

they

will,

therefore,

coordinate

properly.

any

event

the

carrier

starting

units

should

set

sensitively

possible.

any

case,

ALWAYS

set

the

relays

that

must

coordinate

with

each

other

the

same

basic

minimum

tap

setting.

Thus,

the

carrier

start

CEYG51A

relay

terminal

should

set

with

the

same

basic

minimum

reach

setting

the

tripping

CEYG51A

relay

terminal

zero

sequence

current

compensation

used, equation

should

used

instead

equation

lb.

Thus,

obtain.

6.95

2.36

4.59

= =

0.65

per

unit

3(2.36)

7.08

0.33K

0.33

300

percent

For

the

ground

fault

immediately

behind

the

relay,

use

the

equation

Appendix

III

calculate

the

maximum

safe

reach

setting

when

using

zero

sequence

current

compensation.

CONSTRUCTION

The Type

CEYG51A

relay

consists

three

inho—type,

4—pole

induction

cylinder

units.

Each

unit

has

associated

tapped

autotransformer

for

controlling

reach

and

adjustable

resistors

the

polarizing

and

restraint

circuits

for

adjustment

angle

and

basic

minimum

ohmic

reach.

Figures

and

show

construc

tion

details

the

relay.

Internal

connections

the

relay

are

shown

Figure

The

components

are

mounted

cradle

assembly

which

can

easily

removed

from

the

relay

case.

The

cradle

locked

the

case

means

latches

the

top

and

bottom.

The

electrical

connections

between

the

case

block

and

cradle

block

are

completed

through

removable

connection

plug.

separate

testing

plug

can

inserted

place of

the

connection

plig

permit

testing

the

relay

its

case.

The

cover

attaches

the case

from

the

front

and

includes

the

target

reset

mechanism

and

interlock

arm

pre

vent

the

cover

from

being

replaced

until

the

connection

plug

has

been

inserted.

Outline

and

panel

drilling

dimensions

are

shown

Figure

15.

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

ststained

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.

the

relays

are

not

installed

immediately,

they

should

stored

their

original

cartons

place

that

free

from

moisture,

dust,

and

metallic

chips.

Foreign

matter

collected

the

outside

the

case

may

find

its

way

inside

when

the

cover

removed

and

cause

trouble

the

operation

the

relay.

GEK-26423

ACCEPTANCE

TESTS

Immediately

upon

receipt

the

relay

inspection

and

acceptance

test

should

made

insure

that

damage

has

been

sustained

shipment

and

that

the

relay

calibrations

have

not

been

disturbed.

ViSUAL

INSPECTION

Check

the

nameplate

stamping

insure

that

the

model

number,

rating,

and

ohmic

range

the

relay

received

agree

with

the

requisition.

Remove

the

relay

from

its

case

and

check

visual

inspection

that

there

are

broken

cracked

molded

parts

other

signs

physical

damage,

and

that

all

screws

are

tight.

MECHANICAL

INSPECTION

recommended

that

the

following

mechanical

adjustments

checked:

There

should

noticeable

friction

the

rotating

structure

each

unit.

The

normally

closed

contacts

should

closed

when

the

relay

the

upright

position.

There

should

end

play

from

.005

.015

inches

the

shafts

the

rotating

structures.

The

lower jewel

screw

bearing

each

unit

should

screwed

firmly

place,

and

the

pivot

the

top

the

shaft

locked

its

set

screw.

The

contact

gap

each

unit

should

approximately

.045

.065

inches.

There

should

.004

.012

inch

clearance

between

the

stationary

contact

rod

and

the

solid

backstop

when

the

contact is

open.

The

spring

windup

should

sufficient

cause the

normally

closed

stationary

contact

deflect

that

just

touches

the

solid

stop

when

the

unit

dc—energized.

The

clutch

each

unit

should

slip

when

force

grams

applied

the

moving

con

tact

assembly

the

moving

contact.

The

armature

and

contacts

the

target

and

seal-in

unit

should

move

freely

when

operated

hand.

There

should

screw

only

one

the tap

positions

the

right

stationary

contact

strip.

Operate

the

armature

hand and

check

that

the

target

latches

its

exposed

position

before

the

contacts

close.

There

should

least

1/32

wipe

the

seal—in

contacts.

With

the

cover

fastened

securely

place,

check

that

the

target

resets positively

when

the

reset

button

the

5ottom

the

cover

operated.

Check

the

location

the

contact

brushes

the

cradle

and

case blocks

against

the

internal

connection

diagram

for

the

relay.

sure

that

the

shorting

bars

are

the

proper

locations

the

case

blocks,

and

that

the

long

and

short

brushes

the

cradle

block

agree

with

the

internal

connection

dia

gram.

Figure

shows

sectional

view

the

case

and

cradle

blocks with

the

connection

plug

place.

Note

that

there

auxiliary

brush

in each

position

the

case

block.

This

brush

should

formed

high

enough so

that

when

the

connecting

plug

inserted

engages

the

auxiliary

brush

before

striking

the

main

brush.

This

especially

important

current

and

other

circuits

with

shorting

bars

since

improper

adjustment

the

auxiliary

brush

could

result

secondary

circuit

being momentarily

open

circuited.

ELECTRICAL

TESTS

recommended

that

the

following

electrical

checks

made

immediately

upon

receipt

the

relay.

Polarity

Check

The

following

check

will

insure

that

the

relative

polarity

operating,

polarizing

and

restraint

circuits

each

unit

correct,

Each

unit

can

checked

individually

using

the

test

connections

Figure

9. With

all

tap leads

removed

the connections

shown

for

each

unit

should

CaUSe

the

contacts

that

unit

close.

With

the

tap

each

unit

set

the

percent

position,

that

unit

should

develop

strong

contact

opening

torque.

Directional

Check

The

following

checks

are

determine

that

each

unit

has

correct

directional

characteristics.

Use

the

test

connections

shown

Figure

10.

Set the

voltages

two

volts

and

set

the

phase

shifter

that

the

current

leads

the

voltage

degrees

with

the

connections

shown.

The

contacts

each

unit

should

some

value

less

than

the

minimum

amperes

given

Tble

III

and

remain

closed

the

current

increased

the

maximum

value

given

Table

III.

The

taps

should

on 100

percent

for

these

tests.

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