GE CEY52B Manuel utilisateur

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INSTRUCTIONS

GEK

-

454

%

6

MHO

DISTANCE

RELAY

TYPE

CEY

52

B

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

-

45495

CONTENTS

PAGE

DESCRIPTION

APPLICATION

RATINGS

OPERATING

PRINCIPLES

CHARACTERISTICS

BURDENS

CALCULATION

OF

SETTINGS

CONSTRUCTION

RECEIVING

,

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

INSTALLATION

PROCEDURE

INSPECTION

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

SERVICING

RENEWAL

PARTS

3

3

3

4

5

7

7

8

8

9

11

14

14

15

17

UD

CO

PO

O

CO

CXl

o

c

Courtesy of NationalSwitchgear.com

GEK

-

45495

MHO

DISTANCE

RELAY

TYPE

CEY

52

B

DESCRIPTION

The

CEY

52

B

relay

is

a

three

-

phase

,

high

speed

,

single

-

zone

directional

mho

distance

relay

.

It

was

designed

specifically

for

use

with

the

CEX

20

A

or

CEX

20

B

reactance

type

relay

.

See

Table

I

.

The

CEY

52

B

relay

is

constructed

of

three

single

-

phase

units

mounted

in

one

L

2

-

D

case

with

provisions

for

single

phase

testing

.

The

internal

connections

for

the

relay

are

shown

in

Figure

10

,

while

outline

and

panel

drilling

dimensions

are

shown

in

Figure

16

.

Typical

external

connections

to

the

relay

are

shown

in

Figure

4

.

The

relay

is

not

intended

for

use

as

a

first

zone

function

,

thus

the

transient

overreach

characteristics

have

not

been

limited

in

this

respect

.

TABLE

I

BASIC

MINIMUM

REACH

TAPS

OF

CEY

52

B

SELECT

CEX

SHOWN

BELOW

CEX

20

A

CEX

20

B

0.5

-

1.0

-

1.5

1.0

-

2.0

-

3.0

APPLICATION

The

CEY

52

B

relay

is

a

three

-

phase

,

single

zone

mho

distance

relay

that

is

not

meant

to

be

used

by

itself

,

but rather

is

designed

to

be

used

with

a

CEX

20

A

or

CEX

20

B

reactance

type

relay

.

The

combination

of

relays

may

be

used

in

a

step

-

distance

scheme

to

provide

two

zones

of

protection

against

phase

faults

,

or

they

may

be

used

as

part

of

a

high

-

speed

pilot

-

relaying

scheme

in

addition

to

providing

step

-

distance

protection

.

Figure

4

illustrates

typical

external

connections

to

the

relay

when

it

is

used

in

a

step

-

distance

scheme

with

the

CEX

20

B

relay

.

When

applying

this

relay

for

the

protection

of

a

given

circuit

,

select

the

highest

basic

minimum

reach

tap

that

will

accommodate

the

desired

reach

setting

.

This

will

insure

that

the

relay

will

operate

at

the

highest

possible

level

of

torque

.

Since

the

memory

action

of

the

CEY

52

B

will

only

be

effective

for

several

cycles

after

the

inception

of

a

fault

,

the

relay

should

not

be

relied

on

to

provide

time

-

delay

protection

for

any

fault

that

provides

zero

voltage

at

the

relay

.

The

protection

should

be

supplemented

by

other

devices

to

detect

this

condition

if

protection

for

this

contingency

is

required

.

The

section

under

CALCULATION

OF

SETTINGS

provides

a

worked

example

for

determining

the

settings

of

the

CEY

52

B

in

a

typical

application

.

Once

the

settings

have

been

calculated

,

the

taps

are

set

as

described

in

the

section

entitled

TAPPED

AUTO

-

TRANSFORMERS

.

Under

no

conditions

,

should

the

restraint

taps

ever

be

set

less

than

25

percent

.

RATINGS

The

type

CEY

52

relay

covered

by

these

instructions

is

available

for

120

volts

,

5

amperes

,

60

or

50

cycles

rating

.

The

basic

minimum

reach

and

adjustment

ranges

of

the

mho

units

are

given

in

Table

II

.

It

will

be

noted

that

three

basic

minimum

reach

settings

are

listed

for

the

mho

units

.

Selection

of

the

desired

basic

minimum

reach

setting

for

each

unit

is

made

by

means

of

links

on

a

terminal

board

located

at

the

back

of

the

relay

(

see

Fig

.

2

)

.

The

position

of

the

two

sets

of

links

,

(

for

each

unit

)

,

each

identified

as

A

-

B

determine

the

basic

minimum

setting

of

the

mho

units

.

The

ohmic

reach

of

the

mho

units

can

be

adjusted

in

one

percent

steps

over

a

4

/

1

range

for

any

of

the

basic

minimum

reach

settings

listed

in

Table

II

by

means

of

autotransformer

tap

leads

on

the

tap

blocks

at

the

right

side

of

the

relay

.

These

insinuations

do

not

puxpont

to

coven

all

de

.

ta

.

llA

OK

.

vanlations

-

UT

.

equipment

non

to

pnovlde

ion

Should

evexy

possible

contingency

to

be

met

In

connection

with

installation

,

operation

on

mainte

,

nance

.

fiunthen

iyi

&

onmatlon

be

deAlncd

on

should

paxticulan

pnoblems

anise

which

-

one

not

cove

.

ned

sufficiently

&

o

*

i

the

ponchosen

*

s

punposes

,

the

molten

should

be

nepenned

to

the

Genenal

Tlectnic

Company

.

To

the

extent

nequined

the

pnoducts

deAcnibed

henein

meet

applicable

ANSI

,

IEEE

and

MEM

A

standards

;

but

no

such

assonance

is

given

with

nespe

.

ct

to

local

codes

and

ondlnances

because

they

vany

gncatly

.

3

Courtesy of NationalSwitchgear.com

GEK

-

45495

TABLE

II

BASIC

MIN

REACH

(

0

-

N

OHMS

)

*

RANGE

(

0

-

N

OHMS

)

ANGLE

OF

MAX

TORQUE

ONE

SECOND

RATING

BASIC

REACH

TAPS

60

°

*

*

60

°

**

60

°

*

*

0.5

0.5

-

2.0

1.0

-

4.0

1.5

-

6.0

150

1.0

0.5

-

1.0

-

1.5

150

1.5

150

60

°

*

*

60

°

*

*

60

°

*

*

1

1

-

4

2

-

8

3

-

12

150

1

-

2

-

3

2

150

3

150

*

Adjustment

taps

are

set

using

middle

tap

at

the

factory

.

**

Maximum

torque

angle

can

be

adjusted

up

to

75

degrees

.

The

reach

of

the

mho

units

will

increase

to

approximately

120

percent

of

its

reach

at

the

60

degree

setting

.

CONTACTS

The

contacts

of

the

CEY

52

relay

will

close

and

carry

momentarily

30

amperes

direct

current

,

the

circuit

breaker

trip

circuit

must

be

opened

by

an

auxiliary

switch

contact

or

other

suitable

the

relay

contacts

have

no

interrupting

rating

.

However

,

means

since

TARGET

SEAL

-

IN

UNIT

The

target

seal

-

in

unit

used

in

the

CEY

52

relay

has

ratings

as

shown

in

Table

III

.

TABLE

III

TARGET

SEAL

-

IN

UNIT

0.2

AMP

TAP

0.6

AMP

TAP

2.0

AMP

TAP

Mininum

Operating

0.2

amp

0.6

amp

2.0

amp

Carry

Continuously

0.4

amp

1.5

amp

3.5

amp

Carry

30

amps

for

0.03

sec

.

0.5

sec

.

4.0

sec

.

Carry

10

amps

for

0.25

sec

.

4.0

sec

.

30.0

sec

.

D

-

C

Resistance

+

10

%

7.0

ohms

0.6

ohms

0.13

ohms

|

60

Cycle

Impedance

52

ohms

6.0

ohms

0.53

ohms

OPERATING

PRINCIPLES

The

mhc

units

of

the

CEY

52

relay

are

of

the

four

pole

induction

cylinder

construction

in

which

torque

reproduced

by

the

interaction

between

a

polarizing

flux

and

fluxes

proportional

to

the

restraining

or

operating

quantities

.

The

schematic

connections

of

the

mho

unit

are

shown

"

>

n

Fig

.

phase

-

to

-

phase

voltage

,

produce

the

polarizing

percentage

of

the

same

phase

-

to

-

phase

voltage

,

torque

,

Dhase

-

to

-

-

phe

.

se

voltage

,

interacts

with

the

polarizing

5

.

The

two

side

poles

,

energized

by

ux

.

The

flux

in

the

front

pole

,

which

is

energized

by

a

interacts

with

the

polarizing

flux

to

produce

restraint

The

flux

in

the

rear

pole

,

which

is

energizes

by

the

two

line

currents

associated

with

the

same

lux

tc

produce

operating

torque

.

ei

she

torque

at

the

balance

point

of

the

unit

can

therefore

be

expressed

by

the

following

equation

:

0

=

El

COS

(

0

-

9

)

-

KE

2

Torque

where

:

E

-

phase

-

to

-

phase

voltage

(

E

^

)

I

=

delta

current

(

I

•

V

9

=

angle

of

maximum

torque

of

the

unit

0

=

power

factor

angle

of

fault

impedance

K

=

design

constant

1

4

Courtesy of NationalSwitchgear.com

GEK

-

45495

To

prove

that

the

equation

defines

a

mho

characteristic

divide

both

sides

by

E

2

and

transpose

,

equation

reduces

to

:

The

1

2

cos

(

0

-

9

)

=

K

or

:

Y

cos

(

0

-

9

)

=

K

Thus

,

the

unit

will

pick

up

at

a

constant

component

of

admittance

at

a

fixed

angle

depending

on

the

angle

of

maximum

torque

.

Hence

,

the

name

mho

unit

.

CHARACTERISTICS

MHO

UNIT

1

.

Impedance

Characteristic

The

impedance

characteristic

of

a

mho

unit

is

shown

in

Fig

.

6

for

the

one

ohm

basic

minimum

reach

setting

at

a

maximum

torque

angle

of

60

degrees

.

This

circle

can

be

expanded

by

means

of

the

mho

taps

on

the

autotransformer

tap

block

providing

a

range

of

up

to

4

/

1

,

or

by

changing

the

basic

minimum

reach

of

the

unit

by

means

of

the

links

on

the

rear

providing

a

total

range

of

up

to

12

/

1

.

The

circle

will

always

pass

through

the

origin

and

have

a

diameter

along

the

60

degree

impedance

line

equal

to

the

ohmic

reach

of

the

unit

as

expressed

by

the

following

:

(

100

)

Z

-

min

Ohmic

Reach

=

tap

setting

(

%

)

where

:

Zm

^

n

=

basic

min

.

phase

-

to

~

neutral

ohmic

reach

of

the

unit

.

The

angle

of

maximum

torque

of

the

mho

unit

can

be

adjusted

up

to

75

degrees

(

see

SERVICING

)

with

resulting

increase

in

reach

to

approximately

120

percent

of

its

reach

at

60

degrees

for

the

same

tap

setting

.

This

is

shown

by

the

dotted

characteristic

in

Fig

.

6

.

Directional

Action

The

mho

unit

is

carefully

adjusted

to

have

correct

directional

action

under

steady

-

state

,

low

voltage

and

low

current

conditions

.

For

faults

in

the

non

-

tripping

direction

,

the

contacts

will

remain

open

at

zero

volts

between

0

and

60

amperes

.

For

faults

in

the

tripping

direction

,

the

unit

will

close

its

con

-

tacts

between

the

current

limits

in

Table

IV

for

the

three

basic

minimum

reach

settings

at

the

voltage

shown

.

This

adjustment

is

a

function

of

the

core

(

inner

stator

)

position

and

should

any

adjustment

be

necessary

see

SERVICING

.

2

.

TABLE

IV

CURRENT

RANGE

FOR

CORRECT

DIRECTIONAL

ACTION

BASIC

MIN

REACH

TAP

*

V

0

LTS

0.5

Q

1.0

a

1.5

a

2

a

3

a

2.0

volts

2.0

volts

2.0

volts

2.0

volts

2.0

volts

1 2

-

6 0

amps

6

-

6 0

amps

4.5

-

6 0

amps

3

-

6 0

amps

2

-

6 0

amps

*

The

unit

is

set

at

the

factory

on

the

middle

tap

(

la

for

0.5

/

1

/

1.5

unit

and

2

a

for

1

/

2

/

3

ohm

unit

)

for

correct

directional

action

over

the

indicated

current

range

.

A

variation

of

+

10

percent

can

be

expected

on

the

values

listed

.

For

performance

during

transient

low

-

voltage

conditions

,

where

the

voltage

was

normal

at

120

volts

prior

to

the

fault

,

refer

to

the

paragraph

below

on

memory

action

.

5

Courtesy of NationalSwitchgear.com

GEK

-

45495

Underreach

J

.

At

reduced

voltage

the

ohmic

value

at

which

the

mho

unit

will

operate

may

be

somewhat

lower

than

the

calculated

value

.

This

"

pullback

"

or

reduction

in

reach

is

shown

in

Fig

.

3

for

the

1

,

2

and

3

ohm

basic

minimum

reach

settings

.

The

unit

reach

in

percent

of

setting

is

plotted

against

the

three

-

phase

fault

cur

-

t

for

three

ohmic

reach

tap

settings

.

Note

that

the

fault

current

scale

changes

with

the

basic

minimum

reach

setting

.

The

mho

unit

will

operate

for

all

points

to

the

right

of

the

curve

.

The

steady

-

state

curves

of

rig

.

3

were

determined

by

tests

performed

with

no

voltage

supplied

to

the

relay

before

the

fault

was

applied

.

The

dynamic

curves

were

obtained

with

full

rated

voltage

of

120

volts

supplied

to

the

relay

before

ie

fault

was

applied

.

+

t

L

i

Memory

Action

4

.

The

dynamic

curves

of

Fig

.

3

illustrate

the

effect

of

memory

action

in

the

mho

unit

which

maintains

the

polarizing

flux

for

a

few

cycles

following

the

inception

of

the

fault

.

This

memory

action

is

particularly

effective

at

low

voltage

levels

where

it

enables

the

mho

unit

to

operate

for

low

fault

currents

.

This

can

be

most

forcefully

illustrated

for

a

zero

voltage

fault

by

referring

to

Fig

.

3

.

A

zero

voltage

fault

must

be

right

at

the

relay

bus

and

therefore

,

to

protect

for

this

fault

,

it

is

imperative

that

the

relay

reach

zero

percent

of

its

setting

.

Fig

.

3

shows

that

the

mho

unit

,

under

static

conditions

,

will

not

see

a

fault

at

zero

percent

of

the

relay

setting

regardless

of

the

tap

setting

.

However

,

under

dynamic

conditions

when

the

memory

action

is

effective

,

Fig

.

3

shows

that

mho

unit

with

a

three

-

ohm

basic

minimum

reach

and

100

percent

tap

setting

will

operate

if

is

greater

than

1.6

amperes

.

The

memory

action

will

close

the

contact

for

only

a

short

period

of

time

and

therefore

,

memory

action

cannot

be

relied

on

if

the

tripping

is

delayed

.

When

the

relay

is

used

,

as

a

second

zone

relay

and

tripping

is

delayed

by

the

zone

2

setting

of

the

type

RPM

relay

,

the

static

characteristic

should

be

used

.

For

this

application

to

operate

for

nearby

faults

and

there

will

be

sufficient

voltage

to

give

tripping

without

depending

on

memory

action

.

Operating

Time

5

.

The

operating

time

of

the

mho

unit

is

determined

by

a

number

of

factors

such

as

the

basic

minimum

reach

setting

of

the

unit

,

fault

current

magnitude

,

ratio

of

fault

impedance

to

relay

reach

,

and

magnitude

of

relay

voltage

prior

to

the

fault

.

The

curves

in

Fig

.

8

are

for

the

condition

of

rated

volts

prior

to

the

fault

.

Time

curves

are

given

for

four

ratios

of

fault

impedance

to

relay

reach

setting

.

In

all

cases

,

the

mho

taps

were

in

the

100

percent

position

and

the

angle

of

maximum

torque

was

set

at

60

degrees

lag

.

TAPPED

AUT

0

-

TRANS

0

FRMERS

(

See

Fig

.

7

)

The

ohmic

reach

of

the

mho

units

may

be

adjusted

by

means

of

taps

on

the

two

auto

-

transformers

.

Each

auto

-

transformer

has

two

windings

.

One

winding

is

tapped

in

10

percent

steps

from

15

percent

to

95

percent

.

The

other

winding

is

tapped

at

0

percent

,

1

percent

,

3

percent

and

5

percent

.

The

desired

tap

setting

is

made

by

the

proper

location

of

the

leads

marked

No

.

1

and

the

jumper

con

-

necting

the

two

windings

of

the

auto

-

transformer

.

Note

that

the

0

-

5

percent

winding

may

be

added

or

subtracted

from

the

15

-

95

percent

winding

.

The

tap

setting

required

to

protect

a

zone

Z

ohms

long

,

where

Z

is

positive

phase

sequence

phase

-

to

-

neutral

impedance

expressed

in

secondary

terms

,

is

determined

by

the

following

equation

:

(

100

)

(

Min

.

Ohms

Setting

)

Cos

(

0

-

9

)

Tap

Setting

=

Z

where

:

0

=

Power

factor

angle

of

fault

impedance

9

=

Angle

of

maximum

torque

of

the

unit

Example

1

:

TAP

SETTING

DESIRED

=

91

Set

one

end

of

jumper

lead

to

95

percent

.

Set

the

other

end

to

5

percent

.

Set

No

.

1

to

1

percent

.

(

Note

the

4

percent

setting

of

the

0

-

5

percent

winding

subtracts

from

the

95

percent

setting

)

Example

2

:

TAP

SETTING

DESIRED

=

89

Set

No

.

1

to

5

percent

.

Set

the

other

end

to

1

percent

.

Set

one

end

of

jumper

lead

to

85

percent

.

(

Note

the

4

percent

setting

of

the

0

-

5

percent

winding

adds

to

the

85

percent

setting

.

)

6

Courtesy of NationalSwitchgear.com

GEK

-

45495

BURDENS

CURRENT

CIRCUITS

The

maximum

current

burden

imposed

on

each

current

transformer

at

5

amperes

is

listed

in

Table

v

.

TABLE

V

T

R

P

.

F

.

WATTS

AMPS

CYCLES

X

VA

.

043

5

60

.

026

0.86

1

.

08

1.25

This

data

is

for

the

3.0

ohm

basic

reach

tap

setting

for

60

cycles

,

or

50

cycles

will

be

lower

.

The

burden

for

the

lower

tap

setting

POTENTIAL

CIRCUITS

The

maximum

potential

burden

imposed

on

each

potential

transformer

at

120

volts

is

listed

in

Table

VI

.

TABLE

VI

FREQ

CIRCUIT

R

WATTS

VARS

X

P

.

F

.

VA

Polarizing

Restraint

Polarizing

Restraint

1534

10

1.00

9.4

0.1

60

9.4

1060

1580

0.55

4.2

60

6.3

7.6

135

50

2200

1.00

6.5

0.4

6.5

1160

1600

50

0.73

4.3

5.9

7.2

The

potential

burden

of

the

mho

unit

is

maximum

when

the

restraint

tap

is

set

for

100

percent

.

The

restraint

circuit

burden

and

hence

the

total

relay

burden

will

decrease

when

the

restraint

tap

setting

is

less

than

100

percent

.

The

potential

burden

at

tap

settings

less

than

100

percent

,

can

be

calculated

from

the

following

formula

.

2

Tap

Setting

VA

=

(

a

+

jb

)

+

(

c

+

jd

)

TOO

The

terms

(

a

+

jb

)

(

c

+

jd

)

,

etc

.

represent

the

burdens

of

the

mho

unit

potential

circuit

expressed

in

watts

and

vars

with

their

taps

on

100

percent

.

The

values

of

these

terms

are

given

in

Table

VI

.

(

a

+

jb

)

=

(

watts

+

j

vars

)

for

restraint

circuit

and

(

c

+

jd

)

=

(

watts

+

j

vars

)

for

polarizing

circuit

.

CALCULATION

OF

SETTINGS

Consider

a

230

kV

transmission

line

50

miles

long

having

a

phase

-

to

-

neutral

impedance

of

:

0.14

+

j

0.80

ohms

per

mile

,

Z

„

.

=

50

(

0.14

+

j

0.80

)

=

7

+

j

40

ohm

total

pri

PT

Ratio

=

230

,

000

/

115

=

2000

/

1

CT

Ratio

=

600

/

5

=

120

/

1

CT

Ratio

Z

=

Z

.

sec

pri

PT

Ratio

120

=

(

7.0

+

j

40.0

)

Z

=

0.42

+

j

2.4

ohms

sec

2000

=

2.43

/

80.5

°

ohms

Z

sec

7

Courtesy of NationalSwitchgear.com

GEK

-

45495

Assume

that

the

CEY

52

is

to

be

used

in

conjunction

with

a

CEX

20

A

to

provide

second

zone

protection

and

it

is

aesired

,

after

considering

the

effects

of

infeed

,

to

set

the

relay

to

reach

3.64

/

80.5

°

secondary

ohms

.

For

this

application

the

three

-

ohm

basic

minimum

reach

setting

should

be

used

.

The

ohmic

reach

equation

,

given

the

section

under

CHARACTERISTICS

-

TAPPED

AUTO

-

TRANSFORMERS

is

used

.

(

100

)

(

Min

.

ohms

)

Cos

(

0

-

9

)

Percent

Tap

Setting

=

Z

Minimum

Ohms

=

3.0

at

60

deg

.

,

3.6

at

75

deg

.

=

3.64

Z

=

Z

sec

9

=

750

0

=

80.5

°

(

100

)

(

3.6

)

Cos

(

80.5

-

75

)

Percent

Tap

Setting

=

3.64

Percent

Tap

Setting

=

98

%

CONSTRUCTION

The

type

CEY

52

relays

are

assembled

in

a

deep

large

size

,

double

-

end

(

L

2

D

)

drawout

case

having

studs

at

both

ends

in

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

a

removable

connection

plug

which

completes

the

circuits

.

The

outer

blocks

attached

to

the

case

have

the

studs

for

the

external

connections

and

the

inner

blocks

have

the

terminals

for

the

internal

connections

.

Every

circuit

in

the

drawout

case

has

an

auxiliary

brush

,

as

shown

in

Fig

.

9

,

to

provide

adequate

overlap

when

the

connecting

plug

is

withdrawn

or

inserted

.

Some

circuits

are

equipped

with

shorting

bars

(

see

internal

connections

in

Fig

.

10

)

and

on

those

circuits

,

it

is

especially

important

that

the

auxiliary

brush

make

contact

as

indicated

in

Fig

.

9

with

adequate

pressure

to

prevent

the

opening

of

important

inter

-

locking

circuits

.

The

relay

mechanism

is

mounted

in

a

steel

framework

called

the

cradle

and

is

a

complete

unit

with

all

leads

terminated

at

the

inner

block

.

This

cradle

is

held

firmly

in

the

case

with

a

latch

at

both

top

and

bottom

and

by

a

guide

pin

at

the

back

of

the

case

.

The

connecting

plug

,

besides

making

the

electrical

connections

between

the

respective

blocks

of

the

cradle

and

case

,

also

locks

the

latch

in

place

.

The

cover

,

which

is

drawn

to

the

case

by

thumbscrews

,

holds

the

connecting

plugs

in

place

.

The

target

reset

mechanism

is

a

part

of

the

cover

assembly

.

The

relay

case

is

suitable

for

either

semi

-

flush

or

surface

mounting

on

all

panels

up

to

two

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

.

A

separate

testing

plug

can

be

inserted

in

place

of

the

connecting

plug

to

test

the

relay

in

place

on

the

panel

either

from

its

own

source

of

current

and

voltage

,

or

from

other

sources

;

or

the

relay

can

be

dv

-

awn

out

and

replaced

by

another

which

has

been

tested

in

the

laboratory

.

Figs

.

1

and

2

show

the

relay

removed

from

its

drawout

case

with

all

major

components

identified

.

Symbols

used

to

identify

circuit

components

are

the

same

as

those

which

appear

on

the

internal

connection

diagram

in

Fig

.

10

.

The

relav

includes

three

similar

mho

subassembly

elements

mounted

on

the

front

of

the

cradle

and

a

plate

with

transformers

and

tap

blocks

mounted

on

the

back

of

the

cradle

.

See

Figs

.

1

and

2

.

The

mho

sub

-

assembly

includes

the

four

-

pole

uni

!

:

and

the

associated

circuit

components

.

Rheostats

(

R

21

,

,

R

23

;

used

in

setting

the

angle

of

maximum

torque

and

rheostats

Rll

,

R

12

,

R

13

used

in

setting

the

basic

minimum

reach

can

be

adjusted

from

the

front

of

the

relay

.

The

tap

blocks

for

changing

the

basic

minimum

reach

of

the

units

are

mounted

on

the

back

,

must

be

removed

from

its

case

to

make

the

settings

.

The

relav

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

8

Courtesy of NationalSwitchgear.com

GEK

-

45495

If

injury

or

damage

resulting

from

rough

handling

is

evident

,

file

a

damage

claim

at

once

with

the

transit

.

transportation

company

and

promptly

notify

the

nearest

General

Electric

Apparatus

Sales

Office

.

Reasonable

care

should

be

exercised

in

unpacking

the

relay

in

order

that

none

of

the

parts

are

injured

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

"

'

nside

when

the

cover

is

removed

and

cause

trouble

in

the

operation

of

the

relay

.

ACCEPTANCE

TESTS

Immediately

upon

receipt

of

the

relay

,

an

inspection

and

acceptance

tests

should

be

made

to

insure

that

no

damage

has

been

sustained

in

shipment

and

that

the

relay

calibrations

have

not

been

disturbed

.

If

the

examination

or

test

indicates

that

readjustment

is

necessary

,

refer

to

the

section

on

SERVICING

.

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

other

signs

of

physical

damage

,

and

that

all

screws

are

tight

.

MECHANICAL

INSPECTION

It

is

recommended

that

the

mechanical

adjustments

in

Table

VIII

be

checked

.

1

.

2

.

There

should

be

no

noticeable

friction

in

the

rotating

structure

of

the

units

.

3

.

Make

sure

control

springs

are

not

deformed

and

spring

convolutions

do

not

touch

each

other

.

4

.

With

the

relay

well

leveled

in

its

upright

position

the

contacts

of

all

three

units

must

be

open

.

The

moving

contacts

of

the

units

should

rest

against

the

backstop

.

The

armature

and

contacts

of

the

seal

-

in

unit

should

move

freely

when

operated

by

hand

.

There

should

be

at

least

1

/

32

inch

wipe

on

the

seal

-

in

contacts

.

Check

the

location

of

the

contact

brushes

on

the

cradle

and

case

blocks

against

the

internal

connection

diagram

for

the

relay

.

5

.

6

.

TABLE

VIII

CHECK

POINTS

MHO

UNITS

Rotating

Shaft

End

Play

Contact

Gap

Contact

Wipe

.

010

-

.

015

inch

.

155

inch

.

005

inch

.

145

.

003

ELECTRICAL

CHECKS

-

MHO

UNITS

«

7

1

j

t

tests

must

be

made

with

relay

in

case

.

Before

any

electrical

checks

are

made

on

the

mho

units

the

y

should

be

connected

as

shown

in

Fig

.

11

and

be

allowed

to

warm

up

for

approximately

15

minutes

with

the

circuit

alone

energized

at

rated

voltage

and

the

restraint

taps

set

at

100

percent

.

The

units

or

to

factory

adjustment

and

if

rechecked

when

cold

will

tend

to

underreach

by

3

or

4

per

-

Accurate

'

y

calibrated

meters

are

,

of

course

,

essential

.

desirable

to

check

the

factory

setting

and

calibration

by

means

of

the

test

described

in

the

fol

-

ding

sections

.

The

mho

units

were

carefully

adjusted

at

the

factory

and

it

is

not

advisable

to

disturb

r

,

e

$

e

settings

unless

the

following

checks

indicate

conclusively

that

the

settings

have

been

disturbed

.

If

eadjustments

are

necessary

refer

to

the

section

on

SERVICING

for

the

recommended

procedures

.

Test

connections

for

checking

correct

mho

unit

operation

,

a

)

Control

Spring

Adjustment

Be

sure

that

the

relay

is

level

in

its

upright

position

.

Leave

the

relay

connected

as

shown

in

Fig

.

11

and

leave

the

restraint

taps

in

the

100

percent

position

.

la

.

ocential

-

f

i

\

9

Courtesy of NationalSwitchgear.com

GEK

-

45495

Use

the

following

procedure

in

checking

each

unit

.

With

the

current

set

at

five

amperes

and

the

voltage

across

relay

voltage

studs

at

120

volts

,

set

the

phase

shifter

so

that

the

phase

-

angle

meter

reads

the

value

shown

in

Table

IX

for

the

unit

being

tested

,

that

is

so

current

lags

voltage

by

an

angle

equal

to

the

angle

of

maximum

torque

of

the

unit

.

Now

reduce

the

voltage

to

the

low

test

voltage

and

reduce

the

cur

-

rent

to

about

two

amperes

.

Gradually

increase

the

current

until

the

contacts

of

the

unit

just

close

.

This

should

occur

between

the

currents

listed

in

Table

IX

.

(

b

)

Clutch

Adjustment

The

mho

units

include

a

high

-

set

clutch

between

the

cup

and

shaft

assembly

and

the

moving

contact

tc

prevent

damage

during

heavy

fault

conditions

.

These

clutches

have

been

set

at

the

factory

to

slip

at

approximately

40

-

60

grams

applied

tangentially

at

the

moving

contact

.

This

can

best

be

checked

in

the

field

in

terms

of

volt

-

amperes

by

the

following

method

.

Use

the

connections

of

Fig

.

11

and

set

the

phase

shifter

so

that

the

phase

-

angle

meter

reads

the

value

in

Table

X

for

the

unit

to

be

checked

,

at

120

volts

and

5

amperes

.

Disconnect

the

No

.

1

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

26

and

45

amperes

for

the

3

nunit

or

just

above

52

amperes

for

1.512

unit

.

(

c

)

Ohmic

Reach

With

the

relay

still

connected

as

shown

in

Fig

.

11

and

the

restraint

tap

leads

in

the

100

percent

position

,

make

connections

shown

in

Table

X

and

set

the

phase

shifter

so

that

the

phase

-

angle

meter

reads

the

angle

shown

in

the

table

for

the

unit

to

be

checked

.

Now

reduce

the

voltage

to

the

value

shown

in

Table

X

and

increase

the

current

gradually

until

the

normally

open

contacts

of

the

unit

just

close

.

This

should

occur

within

the

limits

shown

.

Note

that

the

ta

screws

on

the

transactor

tap

blocks

are

set

to

the

position

which

gives

the

basic

minimum

reach

shown

in

the

table

.

Note

that

for

the

test

conditions

,

the

mho

units

see

a

phase

-

to

-

phase

fault

of

twice

the

basic

minimum

reach

.

The

relays

are

normally

shipped

from

the

factory

with

the

basic

minimum

reach

adjustment

taps

of

the

units

in

the

intermediate

setting

,

that

is

the

2

ohm

-

tap

.

If

the

units

are

set

on

either

of

the

remain

-

ing

basic

minimum

reach

taps

,

2

or

3

ohms

,

the

basic

reach

of

the

units

will

be

within

+

4

percent

of

the

nameplate

marking

.

(

d

)

Angle

of

Maximum

Torque

For

checking

the

angle

of

maximum

torque

the

connections

of

Fig

.

11

will

be

used

with

the

restraint

tap

leads

set

at

100

percent

position

,

and

with

the

voltage

set

at

the

value

shown

in

Table

XI

for

the

unit

to

be

checked

.

The

minimum

reach

taps

should

be

set

to

the

2

-

ohm

position

.

In

checking

the

mho

units

the

following

procedure

should

be

used

.

First

set

the

phase

shifter

so

tnat

the

phase

-

angle

meter

reads

330

degrees

.

Note

that

while

the

phase

angle

is

being

set

,

the

current

should

be

at

5

amperes

and

the

voltage

at

120

volts

.

Now

set

the

voltage

at

the

value

shown

in

Table

XI

;

increase

the

current

slowly

until

the

mho

unit

picks

up

.

The

pickup

current

should

be

within

the

limits

shown

in

the

table

.

Now

reset

the

phase

angle

at

270

degrees

and

again

check

the

current

required

to

pick

up

the

mho

unit

.

This

current

should

fall

within

the

same

limits

as

for

the

330

degree

check

.

Connect

the

relay

as

follows

:

CONNECT

LEAD

TO

RELAY

STUDS

AS

FOLLOWS

(

SEE

FIG

.

11

)

JUMPER

STUDS

UNIT

UNIT

LOCATION

LEAD

A

LEAD

B

LEAD

C

LEAD

D

*

1

-

2

14

-

15

13

-

16

-

17

TOP

6

-

8

-

10

5

7

13

-

16

-

17

18

-

19

-

20

MIDDLE

*

2

-

3

7

9

6

-

8

-

10

18

-

19

-

20

BOTTOM

*

3

-

1

14

-

15

9

5

6

-

8

-

10

10

Courtesy of NationalSwitchgear.com