GE CEY51A User manual

GEK

31144

Insert

Booklet

GEK

1275

INSTRUCTIONS

Mho

Distance

Relay

Type

CEY

Model

CEY

(

)

INTRODUCTION

This

insert

booklet

and

the

CEY

(

)

instruction

book

(

GEK

1275

)

form

the

instructions

for

the

CEY

(

)

DESCRIPTION

The

CEY

(

)

relay

similar

the

CEY

(

)

relay

except

that

the

contact

circuits

were

arranged

per

the

CEY

(

)

relay

contact

circuits

Check

figure

this

insert

booklet

for

the

contact

circuit

arrangement

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

siet

connection

with

installation

operation

Maintenance

Should

further

inforsiation

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

purposes

the

matter

should

referred

the

eneral

Electric

Company

POWER

SYSTEMS

MANAGEMENT

DEPARTMENT

ELECTRIC

GENERAL

PHILADELPHIA

Courtesy of NationalSwitchgear.com

GEK

31144

;

POL

135

ryrp

Lfj

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RII

AOPER

URI

LnnnJ

AOPER

Rjuun

VOPER

023

JRI

SHORT

FIBBER

TOP

UNIT

MIDDLE

UNIT

BOTTOM

FIG

(

0227

7013

)

Internal

Conm

ctions

Diagram

For

The

CEY

Relay

(

Front

View

)

(

100

)

GENERAL

ELECTRIC

METER

AND

CONTROL

BUSINESS

DEPT

MALVERN

19355

Courtesy of NationalSwitchgear.com

GEK

1275

INSTRUCTIONS

MHO

DISTANCE

RELAY

TYPE

CEY

Protection

and

Control

205

Great

Valley

Parkway

Malvern

19355

1337

Courtesy of NationalSwitchgear.com

GEK

1275

CONTENTS

PAGE

INTRODUCTION

APPLICATION

CALCULATION

SETTINGS

RATINGS

Contacts

Target

Seal

Unit

OPERATING

PRINCIPLES

CHARACTERISTICS

Mho

Unit

Tapped

Autotrarsformer

Current

Circuits

Potential

Circuits

CONSTRUCTION

RECEIVING

HANDLING

STORAGE

ACCEPTANCE

TESTS

Visual

Inspection

Mechanical

Inspection

Electrical

Checks

Mho

Unit

Electrical

Tests

Target

Seal

INSTALLATION

PROCEDURE

Location

Mounting

Connections

Visual

Inspection

Mechanical

Inspection

Portable

Test

Equipment

Electrical

Tests

the

Mho

Units

INSPECTION

Target

Seal

Unit

Mho

Units

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

Contact

Cleaning

SERVICING

Control

Spring

Adjustments

Ohmic

Reach

Adjustment

Angle

Maximum

Torque

Directional

Check

RENEWAL

PARTS

LIST

FIGURES

Cover

(

8036548

)

Courtesy of NationalSwitchgear.com

GEK

1275

MHO

DISTANCE

RELAY

TYPE

CEY

INTRODUCTION

The

CEY

relay

extended

range

three

phase

high

speed

single

zone

mho

directional

distance

relay

constructed

three

single

phase

units

one

case

with

provisions

for

single

phase

testing

One

target

and

seal

unit

provides

indication

operation

for

all

three

units

The

transient

overreach

this

relay

limited

design

that

suitable

for

use

first

zone

device

One

CEY

relay

will

provide

complete

one

zone

protection

for

three

phase

and

double

phase

ground

faults

APPLICATION

The

CEY

relay

because

its

low

transient

overreach

(

maximum

six

percent

)

and

its

memory

action

primarily

first

zone

tripping

relay

such

applicable

high

speed

tripping

unit

direct

and

permissive

underreaching

transferred

tripping

schemes

well

first

zone

tripping

relay

straight

distance

and

carrier

schemes

When

applying

this

relay

for

the

protection

given

circuit

advantageous

set

the

relay

the

highest

basic

minimum

reach

tap

that

will

accomodate

the

desired

reach

setting

operating

torque

level

For

first

zone

applications

the

relay

may

set

for

much

the

distance

the

remote

terminal

This

will

ensure

the

highest

possible

Since

all

forms

the

CEY

relay

have

adjustable

maximum

torque

angle

available

consideration

which

angle

use

may

arise

suggested

that

arc

resistance

for

faults

near

the

relay

should

considered

this

regard

The

smaller

the

angle

maximum

torque

the

greater

the

arc

resistance

that

the

unit

will

accommodate

The

basic

sensitivity

the

CEY

relay

will

depend

the

basic

minimum

tap

that

used

Figure

gives

the

steady

state

and

dynamic

sensitivity

the

relay

order

sure

that

the

relay

will

reach

less

than

its

setting

the

minimum

three

phase

fault

current

flowing

the

relay

for

fault

the

remote

end

the

line

should

least

those

values

given

table

Courtesy of NationalSwitchgear.com

GEK

1275

TABLE

Basic

Minimum

Tap

Setting

Restraint

Tap

Setting

Min

phase

Fault

Current

Required

0.2

ohms

15.0

amps

0.2

22.5

0.2

100

30.0

0.375

8.0

12.0

100

16.0

0.4

7.5

0.4

11.25

0.4

100

15.0

0.75

4.0

0.75

6.0

0.75

100

8.0

0.8

3.75

0.8

5.6

100

0.8

7.5

1.5

2.0

1.5

3.0

1.5

100

4.0

3.0

1.0

3.0

1.5

100

3.0

2.0

6.0

0.5

6.0

0.75

6.0

100

1.0

The

CEY

and

its

companion

zone

packaged

relays

may

combined

many

different

ways

for

use

different

schemes

including

straight

distance

protection

directional

comparison

carrier

protection

permissive

overreaching

permissive

and

rect

underreaching

transferred

tripping

and

many

different

back

schemes

Figure

illustrates

the

external

connections

the

CEY

when

used

conjunction

with

CEY

CEB

and

RPM

for

three

zone

protection

transmission

line

against

all

multi

phase

faults

The

section

under

CALCULATION

SETTINGS

provides

worked

example

for

typical

application

the

CEY

relay

CALCULATION

SETTINGS

Consider

230

transmission

line

miles

long

having

phase

neutral

impedance

zprim

0.14

0.80

ohms

per

mile

Courtesy of NationalSwitchgear.com

GEK

1275

Zprim

(

0.14

0.80

)

ohms

total

Ratio

230

000

115

2000

Ratio

600

120

Assume

that

the

minimum

three

phase

fault

current

flowing

the

relay

for

three

phase

fault

the

remote

end

the

line

about

secondary

amperes

and

for

fault

secondary

amperes

Ratio

Zsec

Zprim

Ratio

sec

(

7.0

40.0

)

120

0.42

2.4

ohms

UUTT

2.43

80.5

ohms

Zsec

Assume

that

the

CEY

used

provide

first

zone

protection

and

desired

set

the

relay

protect

the

line

0.9

(

Zsec

)

0.9

(

2.43

)

For

this

application

the

highest

suitable

basic

minimum

tap

1.5

ohms

80.5

2.19

80.5

The

ohmic

reach

equation

given

the

section

under

OPERATING

CHARACTERISTICS

TAPPED

AUTOTRANSFORMER

used

obtain

the

required

tap

setting

(

100

)

(

Min

Ohms

)

Cos

(

)

Percent

Tap

Setting

Minimum

Ohms

1.5

Zsec

2.19

ohms

80.50

The

selection

the

maximum

torque

angle

for

first

zone

relay

should

depend

primarily

accommodation

arc

resistance

Smaller

maximum

torque

angles

will

accommodate

arc

resistance

than

larger

maximum

torque

angles

Since

arc

resistance

independent

line

length

the

shorter

lines

will

provide

the

greatest

problem

this

score

because

the

shorter

reach

setting

the

relay

Thus

short

lines

desirable

use

smaller

angles

maximum

torque

longer

lines

where

the

mho

unit

must

set

with

longer

reach

would

have

significant

arc

resistance

capability

even

with

larger

angle

maximum

torque

Another

factor

consider

immunity

system

swings

general

angle

maximum

torque

approaching

the

angle

the

line

will

provide

the

greatest

immunity

system

swings

Thus

for

most

lines

the

setting

would

provide

the

greatest

immunity

Courtesy of NationalSwitchgear.com

GEK

1275

Since

system

swings

are

not

usually

problem

short

lines

but

arc

resistance

and

since

arc

resistance

may

not

problem

long

lines

but

system

swings

might

good

general

practice

use

the

lower

maximum

torque

angle

universally

except

where

system

swings

may

problem

Since

this

short

line

the

normal

angle

maximum

torque

will

used

Thus

600

100

(

1.5

)

Cos

(

80.5

)

Percent

Tap

Setting

2.19

check

with

the

table

the

APPLICATION

section

will

indicate

that

the

minimum

fault

current

amperes

sufficient

operate

the

relay

for

the

settings

selected

plot

this

characteristic

the

diagram

will

show

that

the

unit

will

accommodate

approximately

1.15

secondary

ohms

arc

resistance

for

fault

the

ori

rough

estimate

the

arc

resistance

that

relay

will

see

for

multi

phase

fault

given

130

where

130

three

phase

fault

current

flowing

the

relay

Since

the

minimum

three

phase

fault

current

the

relay

for

fault

was

given

amperes

the

maximum

arc

resistance

0.27

secondary

ohms

The

relay

setting

will

accommodate

this

very

easily

and

would

setting

However

the

setting

will

accommodate

arc

resistance

near

the

balance

point

and

since

the

line

short

and

system

swings

are

not

apt

problem

the

setting

desirable

RATINGS

The

type

CEY

relay

covered

these

instructions

available

for

120

volts

amperes

cycle

rating

The

one

second

rating

the

current

circuits

225

amperes

The

basic

minimum

reach

and

adjustment

ranges

the

mho

units

are

given

Tabl

Courtesy of NationalSwitchgear.com

GEK

1275

TABLE

MINIMUM

REACH

MHO

RANGE

ANGLE

UNIT

0.2

0.4

0.8

0.375

0.75

1.5

0.75

1.5

3.0

0.2

0.375

0.75

1.5

3.0

6.0

1.5

Adjustment

taps

are

set

for

1.5

ohms

(

0.4

ohms

)

The

angle

maximum

torque

can

adjusted

The

reach

the

mho

units

the

setting

will

increase

approximately

103

its

reach

the

setting

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

two

tap

screws

two

section

tap

block

located

the

back

the

relay

(

see

Figure

)

The

position

these

screws

determines

the

tap

setting

the

two

primary

windings

the

transactors

(

)

The

ohmic

reach

the

mho

units

can

adjusted

steps

over

range

for

any

the

basic

minimum

reach

settings

listed

Table

means

autotransformer

tap

leads

the

tap

blocks

the

right

side

the

relay

CONTACTS

The

contacts

the

CEY

relay

will

and

momentarily

carry

amperes

However

the

circuit

breaker

trip

circuit

must

opened

auxiliary

switch

contact

other

suitable

means

since

the

relay

contacts

have

interrupting

rating

TARGET

SEAL

UNIT

The

target

seal

unit

used

the

CEY

relay

has

ratings

shown

Table

III

TABLE

III

2.0

Amp

0.2

2.0

Amp

2.0

0.6

0.2

Carry

Amps

for

(

seconds

)

Carry

Amps

for

(

seconds

)

Carry

Continuously

(

Amp

)

Minimum

Operating

(

Amp

)

Minimum

Dropout

(

Amp

)

resistance

(

Ohms

)

Impedance

(

Ohms

)

impedance

(

Ohms

)

2.2

0.5

3.5

0.05

5.0

30.0

0.45

2.0

2.6

1.2

2.3

0.37

2.0

0.6

0.2

0.5

0.15

0.5

0.24

0.78 0.18

0.65

6.2

0.65

0.54

5.1

0.54

0.05

8.3

2.5

Amp

125

VDC

Resistive

Interrupting

Rating

(

Amps

)

Courtesy of NationalSwitchgear.com

GEK

1275

OPERATING

PRINCIPLES

The

mho

units

the

CEY

relay

are

the

four

pole

induction

cylinder

construction

which

torque

produced

the

interaction

between

polarizing

flux

and

fluxes

proportional

the

restraining

operating

quantities

The

schematic

connections

the

unit

are

shown

Figure

poles

energized

phase

voltage

produce

the

polarizing

flux

from

the

front

and

rear

poles

energized

the

difference

between

the

secondary

voltage

transactor

and

percentage

the

same

phase

voltage

interacts

with

the

polarizing

flux

produce

torque

The

torque

equation

can

written

follows

The

two

side

The

flux

Torque

(

IZJI

)

(

)

cos

where

phase

voltage

(

)

delta

current

(

)

ZjT

transfer

impedance

transactor

(

design

constant

)

angle

between

and

(

IZJI

)

design

constant

autotransformer

tap

setting

That

this

equation

(

)

defines

mho

characteristic

can

shown

graphically

means

Figure

The

vector

IZJ

angle

determines

the

basic

minimum

reach

the

unit

for

particular

tap

setting

the

transactor

primary

Assuming

finite

values

and

(

IZT

)

the

balance

point

torque

will

occur

where

cos

that

where

the

angle

The

locus

the

terminus

vector

(

Point

Figure

)

that

will

cause

the

angle

always

900

circle

passing

through

the

origin

and

with

the

vector

IZT

diameter

Considering

further

the

diagram

Figure

note

that

the

angle

less

than

900

for

internal

fault

(

point

)

and

net

tprque

will

the

closing

direction

(

cos

positive

)

;

and

that

the

angle

greater

than

for

external

fault

(

point

)

and

the

net

torque

will

the

opening

direction

(

cos

negative

)

See

Figure

Graphical

Representation

Mho

Operating

Principle

CHARACTERISTICS

MHO

UNIT

Impedance

Characteristic

The

impedance

characteristic

the

mho

unit

shown

Figure

for

the

0.75

ohm

basic

minimum

reach

setting

maximum

torque

angle

This

characteristic

obtained

with

the

terminal

voltage

the

relay

supplied

directly

the

restraint

circuit

the

mho

unit

that

with

the

mho

taps

the

auto

transformer

tap

block

set

100

This

circular

impedance

characteristic

can

Courtesy of NationalSwitchgear.com

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