GE CEX57D User manual

GEK

49778

INSTRUCTIONS

ANGLE

IMPEDANCE

RELAY

TYPES

CEX

Power

Management

205

Great

Valley

Parkway

Malvern

19355

Telephone

(

610

)

251

7000

www

com

edc

Courtesy of NationalSwitchgear.com

GEK

49778

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CEX

AND

CEX

RATINGS

CONTACTS

OPERATING

PRINCIPLES

CHARACTERISTICS

ANGLE

IMPEDANCE

UNIT

UPPER

UNIT

LOWER

UNIT

TAPPED

AUTOTRANSFORMER

BURDENS

CURRENT

CIRCUIT

POTENTIAL

CIRCUIT

CALCULATION

SETTINGS

rflNCTRlirTTON

RECEIVING

HANDLING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

ELECTRICAL

TESTS

ELECTRICAL

TESTS

AUXILIARY

UNIT

(

CEX

ONLY

)

INSTALLATION

PROCEDURE

LOCATION

MOUNTING

CONNECTIONS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

ANGLE

IMPEDANCE

TESTS

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

CONTACT

CLEANING

SERVICING

CONTROL

SPRING

ADjuSTMENT

ANGLE

MAXIMUM

TORQUE

ADJUSTMENT

BASIC

REACH

OHMS

CORE

ADJUSTMENT

RENEWAL

PARTS

OHM

UNIT

(

COVER

PHOTO

8042958

)

Courtesy of NationalSwitchgear.com

GEK

49778

ANGLE

IMPEDANCE

RELAY

TYPES

CEX

DESCRIPTION

Type

CEX

relays

are

high

speed

induction

cup

type

devices

with

ohm

unit

characteristics

that

can

set

parallel

the

impedance

transmission

line

The

relays

are

designed

for

use

with

other

protective

devices

blinder

applications

restrict

the

tripping

area

the

tripping

units

used

protective

relay

scheme

they

may

used

applications

where

tripping

required

during

out

step

condition

instruction

book

These

applications

are

discussed

the

APPLICATION

section

this

Type

CEX

relays

each

contain

two

cup

type

units

and

they

are

mounted

size

case

The

CEX

relay

also

contains

auxiliary

telephone

type

unit

Internal

connections

for

the

relays

are

shown

Figures

and

;

typical

external

connections

are

shown

Figure

Outline

and

panel

drilling

dimensions

are

shown

Figure

APPLICATION

The

CEX

relays

were

designed

specifically

for

use

blinder

applications

initiate

tripping

during

out

step

condition

Three

models

the

relay

are

available

CEX

and

CEX

Typical

applications

for

each

these

relays

are

follows

CEX

AND

CEX

The

CEX

and

CEX

relays

are

used

blinder

applications

restrict

the

area

the

tripping

functions

used

transmission

line

protective

relaying

scheme

(

see

Figure

)

Either

three

CEX

three

CEX

relays

are

required

Basically

tripping

will

permitted

only

when

the

fault

impedance

plots

within

the

reach

the

mho

tripping

function

AND

both

the

ohm

units

Since

the

right

hand

ohm

unit

will

operate

only

for

faults

the

left

both

units

can

operate

simultaneously

only

for

faults

that

plot

between

them

The

tripping

function

(

mho

)

will

provide

correct

directional

action

and

limit

the

reach

the

forward

direction

The

contacts

the

CEX

ohm

units

are

brought

out

separately

and

are

externally

connected

series

with

the

contacts

the

corresponding

mho

tripping

function

provide

supervision

(

see

Figure

)

The

contacts

the

CEX

relay

are

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

Should

further

information

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

matter

should

referred

the

General

Electric

Company

the

purchaser

purposes

the

extent

reguired

the

products

described

herein

meet

applicable

ANSI

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

IEEE

and

NEMA

standards

;

Courtesy of NationalSwitchgear.com

GEK

49778

internally

connected

series

and

are

used

operate

the

internal

mounted

auxiliary

telephone

relay

The

contacts

this

auxiliary

relay

are

then

used

supervise

the

corresponding

mho

tripping

function

(

see

Figure

)

CEX

The

Type

CEX

relay

was

designed

specifically

for

use

with

Type

GSY

NAA

relays

which

provide

the

additional

functions

required

implement

out

step

tripping

scheme

Only

one

CEX

relay

required

these

applications

The

CEX

NAA

combination

primarily

for

application

transmission

lines

combination

primarily

for

application

generators

Specific

details

the

operation

either

these

schemes

can

found

the

appropriate

NAA

GSY

relay

instruction

books

For

further

information

and

exact

model

numbers

these

relays

contact

the

nearest

General

Electric

District

Sales

Office

The

CEX

GSY

RATINGS

The

Type

CEX

relays

covered

these

instructions

are

rated

120

volts

five

amperes

for

either

hertz

They

have

three

basic

minimum

ohmic

reaches

that

are

set

double

set

taps

each

unit

The

taps

are

0.5

1.5

3.0

ohms

(

phase

nuetral

)

when

the

maximum

torque

angle

set

for

five

degrees

lead

(

current

leads

voltage

)

The

reach

the

unit

can

increased

from

minimum

ohms

(

100

percent

tap

)

ten

time

the

minimum

ohms

(

ten

percent

tap

)

means

taps

the

potential

circuit

The

relay

can

set

for

ohmic

reach

between

0.5

ohms

and

ohms

TABLE

TAP

RANGE

AMPERES

ONE

SECOND

CURRENT

RATING

CONTINUOUS

CURRENT

RATING

USED

OHMS

0.5 0.5

8.2

100

amperes

100

amperes

1.5

5.0

amperes

3.0

3.5

100

amperes

CONTACTS

The

contacts

the

Type

CEX

relay

will

and

carry

amperes

momentarily

However

the

circuit

breaker

trip

circuit

must

opened

auxiliary

switch

contact

other

suitable

means

since

the

relay

contacts

have

interrupting

rating

OPERATING

PRINCIPLES

The

units

the

Type

CEX

relay

are

four

pole

induction

cylinder

units

(

see

Figure

)

with

schematic

connections

shown

Figure

impedance

angle

The

two

front

coils

and

the

two

back

coils

are

energized

with

These

units

measure

Courtesy of NationalSwitchgear.com

GEK

49778

delta

currents

produce

polarizing

flux

The

same

delta

current

flows

through

the

operating

coil

produce

operating

flux

The

phase

voltage

applied

the

restraint

coil

produce

restraint

flux

The

torque

produced

the

unit

results

from

the

interaction

the

fluxes

The

torque

therefore

shown

below

Torque

cos

(

)

100

delta

current

(

)

basic

reach

tap

phase

voltage

(

)

restraint

tap

percent

angle

between

(

)

and

maximum

torque

angle

the

relay

the

relay

balance

point

the

torque

zero

where

cos

(

)

100

cos

(

)

100

cos

(

)

cos

(

)

100

The

phase

voltage

(

)

divided

the

delta

current

equal

the

phase

neutral

ohms

(

)

Therefore

cos

(

)

100

For

example

the

basic

reach

taps

(

)

are

set

for

1.5

ohms

and

the

restraint

tap

(

)

set

for

percent

then

the

relay

reach

(

)

will

100

ohms

(

phase

neutral

)

1.5

cos

(

)

The

equation

cos

(

)

100

the

equation

for

straight

line

when

plotted

diagram

(

Figure

)

The

equation

also

gives

straight

line

and

are

plotted

polar

paper

(

Figure

)

Courtesy of NationalSwitchgear.com

GEK

49778

selecting

values

for

and

the

characteristic

can

adjusted

any

distance

from

0.5

ohms

from

the

origin

This

ohm

limitation

based

never

being

less

than

ten

percent

its

minimum

recommended

value

The

angle

maximum

torque

(

)

can

adjusted

any

angle

between

degrees

lead

and

degrees

lead

for

the

top

unit

The

bottom

identical

the

top

unit

except

its

polarity

reversed

that

the

maximum

torque

angle

adjustable

from

plus

180

185

degrees

plus

180

215

degrees

The

upper

potentiometer

each

unit

(

for

the

upper

unit

and

for

the

lower

unit

)

used

set

the

angle

maximum

torque

With

the

potentiometer

set

for

zero

ohms

the

angle

maximum

torque

will

between

and

degrees

(

current

leads

voltage

)

jumper

added

connect

stud

and

second

jumper

connect

stud

then

the

angle

maximum

torque

can

adjusted

between

degrees

and

degrees

using

the

potentiometer

for

the

upper

unit

and

the

potentiometer

for

the

lower

unit

jumpers

are

not

added

then

these

same

two

potentiometers

(

for

the

upper

unit

and

for

the

lower

unit

)

can

used

adjust

the

angle

maximum

torque

between

and

degrees

Angle

maximum

torque

can

set

between

and

degrees

using

these

same

two

potentiometers

jumpers

should

added

not

will

vary

from

relay

and

will

have

determined

test

the

relay

actually

being

adjusted

Whether

the

CHARACTERISTICS

ANGLE

IMPEDANCE

UNIT

The

angle

impedance

unit

characteristic

straight

line

when

plotted

diagram

The

shortest

distance

from

the

characteristic

the

origin

the

minimum

relay

reach

The

minimum

relay

reach

determined

two

sets

taps

The

two

tap

plugs

the

current

circuits

set

the

basic

minimum

reach

(

)

The

tap

plugs

the

restraint

circuit

increase

the

basic

reach

the

restraint

taps

(

)

are

reduced

from

100

percent

The

reach

angle

maximum

torque

equal

therefore

100

minimum

reach

minimum

basic

reach

restraint

tap

where

UPPER

UNIT

The

angle

maximum

torque

the

angle

that

the

reach

described

above

leads

the

axis

(

Figure

)

This

angle

adjustable

from

degrees

lead

The

reach

the

angle

impedance

unit

any

angle

given

the

following

equation

100

cos

(

)

cos

(

)

Courtesy of NationalSwitchgear.com

GEK

49778

angle

leads

angle

maximum

torque

See

Table

for

values

for

the

various

angles

maximum

torque

where

LOWER

UNIT

This

unit

identical

the

upper

unit

except

polarized

have

maximum

torque

180

degrees

from

the

upper

unit

Therefore

the

equation

cos

(

180

)

The

value

given

Table

for

various

angles

maximum

torque

The

value

equal

the

tap

value

when

the

maximum

torque

angle

set

for

five

degrees

only

the

upper

potentiometer

(

for

the

upper

unit

for

the

lower

unit

)

adjusted

the

value

will

shown

Table

The

value

can

adjusted

using

the

lower

potentiometer

(

for

the

upper

unit

for

the

lower

unit

)

;

however

may

not

possible

make

equal

the

tap

value

all

angles

maximum

torque

settings

TABLE

BASIC

REACH

OHMS

(

)

ANGLE

MAXIMUM

TORQUE

STUDS

0.5

OHM

TAP

1.5

OHM

TAP

3.0

OHM

TAP

Jumper

1.43

1.58

2.85

3.15

0.48

0.53

Jumper

0.41

0.47

1.22

1.40

2.43

2.79

Jumper

1.14

1.26

0.38

0.42

2.28

2.52

Jumper

0.34

0.38

1.02

1.13

2.04

2.25

Jumper

0.94

1.07

1.89

2.13

0.32

0.36

Open

0.31

0.37

0.92

1.11

1.83

2.22

350

Open

0.35

0.40

1.05

1.20

2.10

2.40

TAPPED

AUTOTRANSFORMER

The

reach

ohms

the

angle

impedance

may

adjusted

two

taps

the

autotransformer

The

tap

block

and

the

tap

plugs

are

located

the

right

side

the

relay

The

two

tap

leads

marked

control

the

upper

unit

and

the

two

tap

leads

marked

control

the

lower

unit

The

upper

and

tap

leads

should

connected

tap

the

upper

half

the

block

(

zero

ten

percent

)

The

lower

and

tap

leads

should

connected

tap

the

lower

half

the

block

(

percent

)

The

restraint

tap

setting

the

sum

the

two

tap

values

into

which

the

leads

Courtesy of NationalSwitchgear.com

GEK

49778

are

connected

For

example

the

upper

lead

put

the

tap

and

the

lower

lead

put

the

tap

then

the

tap

setting

plus

should

not

set

for

less

than

ten

percent

BURDENS

CURRENT

CIRCUIT

The

current

burden

imposed

each

current

circuit

five

amperes

listed

Table

III

TABLE

III

BASIC

OHM

TAP

AMPS

HERTZ

WATTS

0.5

0.10

0.09

0.72

2.41

3.35

1.5

0.12

0.10

0.77

3.06

3.95

3.0

0.16

4.11

5.13

0.12

0.80

0.5

0.09

2.14

0.08

0.74

2.89

1.5

0.11

0.08

0.80

2.75

3.45

3.0

0.14

0.10

0.81

3.59

4.41

POTENTIAL

CIRCUIT

The

maximum

potential

burden

imposed

the

two

units

the

relay

shown

Table

TABLE

VOLTS

HERTZ

WATTS

120

386

536

0.59

12.74

21.8

120

497

523

0.69

13.74

20.0

The

potential

burden

maximum

when

the

restraint

taps

are

set

for

100

and

the

angle

maximum

torque

near

degrees

lead

any

tap

setting

the

potential

burden

for

each

unit

will

follows

Watts

jVars

(

)

Indicates

Revision

Courtesy of NationalSwitchgear.com

GEK

49778

where

watts

when

100

vars

when

100

See

Table

for

values

and

TABLE

MAXIMUM

TORQUE

ANGLE

(

LEAD

)

JUMPERS

AND

WATTS

(

)(

)

VOLTS

HERTZ

120

2.70

3.50

6.50

5.20

120

5.70

120

6.30

120

300

OFF

8.20

6.20

120

350

OFF

6.40

7.55

120

5.15

2.30

3.33

7.20

120

5.90

120

6.95

120

OFF

6.60

4.83

120

OFF

6.30

4.00

The

total

potential

burden

will

the

sum

the

burden

from

each

unit

Normally

both

units

will

set

for

the

same

reach

and

maximum

torque

angle

will

only

necessary

calculate

the

burden

for

one

unit

This

value

will

the

burden

each

the

two

potential

devices

The

burden

measured

any

unit

may

vary

plus

minus

ten

percent

from

the

instruction

book

values

due

allowable

tolerances

capacitors

and

coils

CALCULATION

SETTINGS

The

exact

settings

made

the

ohm

units

Type

CEX

relays

will

depend

the

particular

application

When

used

blinder

applications

the

primary

objective

restrict

the

tripping

area

the

tripping

units

avoid

operation

load

impedance

Thus

the

reach

setting

should

made

that

operation

prevented

during

maximum

load

flow

stable

power

swing

conditions

The

angle

setting

should

made

that

the

ohm

units

will

plot

parallel

the

protected

line

When

out

step

tripping

during

power

swings

required

tripping

during

stable

swings

can

prevented

and

the

breaker

duty

minimized

permitting

tripping

only

after

favorable

angle

reached

Thus

the

reach

settings

made

will

Indicates

Revision

Courtesy of NationalSwitchgear.com

GEK

49778

Specific

details

for

dependent

particular

system

conditions

and

configuration

determining

the

settings

for

transmission

line

generator

applications

can

found

the

appropriate

instruction

book

for

Type

NAA

GSY

relays

mentioned

earlier

Once

the

desired

reach

and

angle

has

been

determined

only

necessary

calculate

and

set

the

restraint

taps

meet

the

desired

reach

The

restraint

tap

setting

can

calculated

follows

(

)

restraint

tap

setting

percent

basic

reach

tap

desired

reach

secondary

ohms

the

selected

torque

angle

For

example

refer

Figure

and

assume

should

set

reach

five

ohms

the

torque

angle

shown

Base

reach

taps

0.5

1.5

and

3.0

ohms

are

available

Always

select

the

highest

base

reach

tap

that

will

provide

the

desired

reach

setting

For

this

example

use

the

3.0

ohm

tap

Therefore

where

(

100

)

(

3.0

)

percent

Set

the

restraint

taps

for

both

ohm

units

percent

CONSTRUCTION

The

Type

CEX

relays

are

assembled

medium

size

double

end

(

)

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

circuit

The

outer

blocks

attached

the

case

have

studs

for

the

external

connections

and

the

inner

blocks

have

terminals

for

the

internal

connections

Every

circuit

the

drawout

case

has

auxiliary

brush

shown

Figure

provide

adequate

overlap

when

the

connecting

plug

withdrawn

inserted

Some

circuits

are

equipped

with

shorting

bars

(

see

internal

connections

)

and

those

circuits

especially

important

that

the

auxiliary

brush

make

contact

indicated

Figure

with

adequate

pressure

prevent

the

opening

important

interlocking

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

the

back

the

case

The

connecting

plug

besides

making

the

electrical

connections

between

the

respective

blocks

the

cradle

and

case

also

locks

the

latch

place

The

cover

which

drawn

the

case

thumbscrews

holds

the

connecting

plugs

place

The

target

reset

mechanism

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assembly

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