GE CEY53A Manuale utente

INSTRUCTIONS

GEK

7351

MHO

DISTANCE

RELAY

FOR

SHUNT

REACTOR

PROTECTION

TYPE

CEY

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

7351

CONTENTS

PAGE

DESCRIPTION

APPLICATION

CALCULATION

SETTINGS

RATINGS

CONTACTS

CONSTRUCTION

OPERATING

PRINCIPLES

MHO

UNIT

CHARACTERISTICS

IMPEDANCE

CHARACTERISTICS

DIRECTIONAL

ACTION

UNDERREACH

MEMORY

ACTION

TRANSIENT

OVERREACH

OPERATING

TIME

VERNIER

ADJUSTMENT

FOR

LOW

TAP

SETTINGS

BURDENS

CURRENT

CIRCUITS

POTENTIAL

CIRCUITS

MECHANICAL

ADJUSTMENTS

SERVICING

TESTING

WITH

THE

EQUIPMENT

PORTABLE

TEST

EQUIPMENT

ELECTRICAL

TESTS

DRAWOUT

RELAYS

GENERAL

POWER

REQUIREMENTS

GENERAL

RECEIVING

HANDLING

AND

STORAGE

PERIODIC

CHECKS

AND

ROUTINE

MAINTENANCE

CONTACT

CLEANING

RENEWAL

PARTS

INSTALLATION

PROCEDURE

LOCATION

MOUNTING

VISUAL

INSPECTION

MECHANICAL

INSPECTION

Courtesy of NationalSwitchgear.com

GEK

7351

Photos

Not

Available

This

Time

Photos

Not

Available

This

Time

Courtesy of NationalSwitchgear.com

GEK

7351

MHO

DISTANCE

RELAY

FOR

SHUNT

REACTOR

PROTECTION

TYPE

CEY

DESCRIPTION

The

type

CEY

relay

single

phase

zone

one

mho

distance

relay

specifically

designed

for

shunt

reactor

protection

provides

instantaneous

protection

against

turn

and

single

phase

ground

faults

The

relay

mounted

double

unit

single

ended

size

drawout

case

and

provided

with

target

seal

unit

Three

relays

are

required

one

per

phase

for

each

shunt

reactor

installation

APPLICATION

The

type

CEY

relay

zone

one

mho

distance

relay

specifically

designed

for

shunt

reactor

protection

The

external

connections

are

shown

Figure

This

application

shows

the

reactors

connected

integral

part

the

transmission

line

with

the

relays

supplied

with

line

side

potential

When

transmission

line

having

integral

shunt

reactors

first

deenergized

there

will

trapped

voltage

remaining

the

line

which

will

oscillating

some

matural

frequency

determined

the

total

reactance

and

the

line

distributed

shunt

capacitance

The

oscillation

frequency

varies

from

about

for

minimum

maximum

reactor

compensation

respectively

Since

the

relay

would

normally

receive

its

potential

from

line

side

coupling

capacitor

potential

devices

would

subjected

these

voltage

oscillations

the

relay

were

develop

operating

torque

and

its

contacts

under

these

conditions

would

most

likely

prevent

the

successful

high

speed

reclosing

the

line

The

relay

design

such

that

its

ohmic

reach

appreciably

shortened

frequencies

lower

than

rated

frequency

The

curve

Figure

shows

the

mho

unit

response

over

range

the

frequency

decreased

the

mho

unit

maximum

torque

angle

becomes

less

lagging

and

also

the

diameter

the

mho

circle

decreases

These

variations

are

shown

the

curves

Figure

The

curve

Figure

composite

showing

the

effect

both

the

variations

shown

the

curves

Figure

with

degree

angle

line

reference

Shunt

reactors

designed

connected

transmission

lines

will

generally

begin

saturate

just

over

rated

voltage

The

apparent

reduction

reactance

elevated

voltages

must

considered

setting

the

relay

avoid

misoperation

the

reactor

protection

the

line

overvoltage

conditions

expected

When

the

transmission

line

section

and

its

connected

reactor

are

energized

the

zero

point

the

voltage

wave

the

reactor

inrush

current

produced

will

have

maximum

offset

and

will

saturate

the

reactor

some

degree

Thus

the

apparent

reactance

will

reduced

The

relay

setting

must

not

sensitive

respond

this

reduced

apparent

reactance

otherwise

line

retripping

would

result

The

sensitivity

the

protection

for

the

reactor

will

depend

upon

the

relay

setting

and

the

reactor

design

The

relay

sensitivity

will

first

limited

the

considerations

previously

discussed

that

will

not

trip

incorrectly

energizing

overvoltage

etc

The

resulting

setting

will

determine

the

degree

protection

remaining

However

one

example

turn

protection

calculations

particular

reactor

design

indicated

that

short

circuit

involving

only

percent

the

total

turns

would

reduce

the

apparent

impedance

the

reactor

approximately

percent

its

rated

value

Thus

fairly

good

protection

coverage

provided

When

the

reactor

part

the

transmission

line

clearing

any

reactor

faults

requires

the

tripping

remote

line

breaker

The

external

connections

Figure

show

external

auxiliary

device

operated

the

CEY

trip

circuit

provide

transfer

trip

keying

accomplish

this

function

CALCULATION

SETTINGS

For

the

purpose

illustrating

relay

settings

assume

shunt

reactor

100

MVAR

per

phase

500

system

The

reactor

rated

reactance

therefore

These

instructions

not

purport

cover

all

details

variations

equipment

nor

provide

for

every

possible

contingency

met

connection

with

installation

operation

maintenance

further

forma

tion

desired

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

Should

the

extent

required

the

products

described

herein

meet

applicable

ANSI

IEEE

and

NEMA

standards

;

but

such

assurance

given

with

respect

local

codes

and

ordinances

because

they

vary

greatly

Courtesy of NationalSwitchgear.com

GEK

7351

(

ELN

)

(

289

)

106

100

106

835

ohms

primary

VAR

Ratio

Xsec

Xpri

Assume

Ratio

600

Ratio

289

000

120

(

ine

neutral

)

Xsec

41.6

ohms

(

per

unit

)

Assume

maximum

short

time

overvoltage

are

1.3

per

unit

From

the

reactor

saturation

curve

determine

the

current

level

this

voltage

Assume

1.53

per

unit

current

1.30

1.3

voltage

35.4

ohms

1753

The

reactor

apparent

impedance

under

extreme

inrush

conditions

when

energizing

discussed

under

APPLICATION

will

have

calculated

determined

test

When

this

value

known

compare

with

the

apparent

reactance

determined

under

overvoltage

conditions

shown

above

Using

the

smaller

the

two

reactances

reduce

this

value

suitable

margin

perhaps

percent

determine

the

required

relay

reach

setting

Assume

the

relay

set

for

0.55

22.9

ohms

secondary

For

best

performance

select

the

highest

possible

relay

basic

minimum

tap

available

that

can

used

for

the

required

setting

For

this

case

connect

the

two

relay

current

coils

series

shown

the

external

connections

Figure

The

relay

basic

minimum

taps

will

now

twice

the

nameplate

value

For

example

the

nameplate

taps

are

0.75

1.5

connecting

the

two

current

coils

series

will

change

these

tap

values

1.5

this

case

select

the

ohm

tap

The

percent

restraint

tap

determined

the

following

rel

ation

100

cos

(

)

where

reactor

angle

assume

degrees

maximum

torque

angle

relay

degrees

desired

reach

angle

100

(

)

cos

percent

22.9

RATINGS

The

type

CEY

relay

covered

these

instructions

available

for

120

volts

amperes

cycle

rating

The

second

rating

the

current

circuits

225

amperes

per

circuit

The

basic

minimum

reach

and

adjustment

ranges

the

mho

units

are

given

the

table

below

MHo

Unit

Basic

Min

Reach

ohms

Angie

Max

Tor

Range

ohms

Lag

750

Lag

0.75

1.5

3.0

1.5

3.0

6.0

Standard

Long

Reach

0.75

1.5

The

above

basic

minimum

reach

taps

are

for

only

one

current

coil

connected

the

current

circuit

for

both

current

coils

connected

parallel

the

two

current

coils

are

connected

series

these

basic

minimum

taps

are

multiplied

two

CONTACTS

The

contacts

the

CEY

relay

will

and

carry

momentarily

amperes

However

the

circuit

breaker

trip

circuit

must

opened

auxiliary

switch

contact

other

suitable

means

since

the

relay

contacts

have

interrupting

rating

Courtesy of NationalSwitchgear.com

GEK

7351

Target

and

Seal

Unit

The

ratings

the

target

seal

unit

shown

below

Amp

Tap

0.2

Amp

amps

0.3

amps

ohms

Carry

tripping

duty

Carry

continuously

resistance

Impedance

(

cycles

)

amps

0.13

ohms

0.53

ohms

CONSTRUCTION

The

Type

CEY

relays

are

assembled

the

medium

size

single

ended

(

)

drawout

case

having

studs

one

end

the

rear

for

external

connections

The

electrical

connections

between

the

relay

and

case

studs

are

through

stationary

molded

inner

and

outer

blocks

between

which

nests

removable

connecting

plug

The

outer

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

Fig

and

those

circuits

especially

important

that

the

auxiliary

brush

make

contact

indicated

Fig

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

blocks

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

part

the

cover

assembly

The

relay

case

suitable

for

either

semi

flush

surface

mounting

all

panels

inches

thick

and

appropriate

hardware

available

However

panel

thickness

must

indicated

the

relay

order

insure

that

proper

hardware

will

included

Outline

and

panel

drilling

shown

Fig

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

can

drawn

out

and

replaced

another

which

has

been

tested

the

laboratory

Fig

shows

the

relay

removed

from

its

drawout

case

with

all

major

components

identified

Symbols

used

identify

circuit

components

are

the

same

those

which

appear

the

internal

connections

diagram

figure

All

adjustments

can

made

from

the

ront

the

relay

without

removing

the

relay

from

its

case

OPERATING

PRINCIPLES

mho

unit

the

CEY

relay

the

four

pole

induction

cylinder

construction

which

torque

produced

the

interaction

between

polarizing

flux

and

fluxes

proportional

the

restraining

operating

quantities

The

method

obtaining

the

mho

characteristics

for

the

unit

described

below

MHO

UNIT

The

schematic

connections

the

Mho

unit

are

illustrated

fig

The

two

side

poles

energized

phase

neutral

voltage

produce

the

polarizing

flux

The

flux

from

the

front

and

rear

poles

energized

the

difference

between

the

secondary

voltage

the

transactor

and

percentage

the

same

phase

neutral

voltage

interacts

with

the

polarizing

flux

produce

torque

The

torque

equation

can

written

follows

(

IZT

)

cos

Torque

(

)

where

phase

neutral

voltage

(

]

)

line

current

(

]

)

Courtesy of NationalSwitchgear.com

GEK

7351

transfer

impedance

transactor

the

inherent

design

contact

Out

transformer

tap

setting

Angle

between

and

(

IZj

)

That

this

equation

(

)

defines

mho

characteristic

can

shown

graphically

means

fig

The

vector

IZj

angle

determines

the

basic

minimum

reach

the

unit

for

particular

tap

setting

the

transactor

primary

Assuming

finite

value

and

(

IZj

)

the

balance

point

torque

will

occur

where

cos

that

where

the

angle

The

locus

the

terminus

vector

(

point

fig

)

which

will

cause

the

angle

always

circle

passing

through

the

origin

and

with

the

vector

IZj

diameter

Considering

further

the

diagram

fig

note

that

the

angle

less

than

for

internal

fault

(

point

)

and

the

net

torque

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

)

CHARACTERISTICS

IMPEDANCE

CHARACTERISTICS

The

impedance

characteristics

the

mho

unit

shown

Fig

for

the

0.75

ohm

basic

minimum

reach

setting

maximum

torque

angle

This

circular

impedance

characteristic

can

enlarged

that

the

unit

reach

can

increased

reducing

the

percentage

the

terminal

voltage

supplied

the

taps

the

auto

transformer

The

circle

will

always

pass

through

the

origin

and

have

diameter

along

the

degree

impedance

line

equal

the

ohmic

reach

the

unit

expressed

the

following

equation

(

Input

Tap

)

min

Unit

Tap

Setting

(

)

Ohmic

Reach

where

Input

Tap

100

Zmin

Basic

min

ohmic

reach

the

unit

(

tap

setting

)

Unit

Tap

Restraint

tap

lead

setting

transformer

taps

Setting

DIRECTIONAL

ACTION

The

mho

unit

adjusted

have

correct

directional

action

under

steady

state

conditions

For

faults

the

non

tripping

direction

the

contacts

will

remain

open

between

and

amperes

For

faults

the

tripping

direction

the

unit

will

its

contact

for

voltages

and

current

given

the

following

table

BASIC

MIN

REACH

TAP

VOLTAGE

STUDS

CURRENT

RANGE

STUDS

AND

JUMPER

AND

0.75

ohms

1.5

ohms

3.0

ohms

6.0

ohms

2.0

volts

2.0

volts

2.0

volts

2.0

volts

6 0

Amps

6 0

Amps

1.5

6 0

Amps

7 5

6 0

Amps

The

unit

tested

the

factory

the

1.5

ohm

tap

for

correct

directional

action

can

expected

the

other

taps

listed

above

variation

UNDERREACH

(

FIG

)

reduced

voltage

the

ohmic

value

which

the

unit

will

operate

may

somewhat

lower

than

the

calculated

value

This

pullback

reduction

unit

will

operate

for

all

points

the

right

the

curves

Courtesy of NationalSwitchgear.com

GEK

7351

These

curves

were

determined

tests

performed

with

voltage

applied

the

relay

before

the

fault

was

applied

That

the

steady

state

curve

While

the

dynamic

curves

were

obtained

with

full

rated

voltage

appplied

the

relay

before

the

fault

was

applied

MEMORY

ACTION

The

dynamic

curves

fig

show

the

effect

memory

action

the

unit

which

maintains

the

polarizing

flux

for

few

cycles

following

the

fault

This

memory

action

particularly

effective

low

voltage

levels

current

The

steady

state

curve

shows

that

the

unit

will

not

see

fault

zero

percent

the

relay

setting

regardless

the

tap

setting

Under

dynamic

conditions

when

memory

action

i s

effective

when

greater

than

2.53

amperes

TRANSIENT

OVERREACH

The

operation

the

mho

unit

under

transient

conditions

the

inception

fault

important

because

the

relay

normally

connected

that

the

MHO

contacts

will

trip

circuit

breaker

independently

any

other

contacts

The

impedance

characteristic

Fig

and

the

steady

state

curves

Fig

represent

steady

state

conditions

the

fault

current

contains

transient

the

unit

may

its

contacts

momentarily

even

though

the

impedance

being

measured

slightly

greater

than

the

calculated

steady

state

reach

This

overreaching

tendency

will

maximum

when

fault

occurs

the

one

instant

either

half

cycle

which

produces

the

maximum

offset

the

current

wave

The

maximum

transient

overreach

the

MHO

unit

will

not

exceed

percent

the

steady

state

reach

for

line

angles

degrees

OPERATING

TIME

The

operating

time

the

MHO

unit

determined

number

factors

such

the

basic

minimum

reach

setting

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

taps

were

the

100

percent

position

and

the

angle

maximum

torque

was

set

VERNIER

ADJUSTMENT

FOR

LOW

TAP

SETTINGS

The

input

leads

the

tapped

auto

transformer

are

normally

set

100

percent

but

for

applications

lines

with

high

secondary

line

impedance

where

the

tap

leads

would

set

low

percentage

the

input

connections

can

varied

vernier

method

obtain

closer

setting

For

example

the

desired

first

zone

reach

4.5

ohms

and

the

basic

minimum

reach

setting

the

unit

ohms

with

the

input

setting

100

percent

the

tap

leads

would

100

(

)

Tap

Setting

66.7

percent

4.5

This

desired

reach

setting

can

made

within

0.45

percent

accuracy

means

the

percent

However

the

desired

firsr

zone

reach

were

28.5

ohms

the

output

tap

setting

would

tap

100

(

)

10.5

percent

2875

The

nearest

output

tap

would

percent

which

4.2

percent

off

the

desired

value

correct

this

the

input

leads

can

shifted

percent

which

case

the

output

would

(

)

percent

28.5

BURDENS

CURRENT

CIRCUITS

The

maximum

current

burden

imposed

each

current

transformer

amperes

and

cycles

listed

below

AMPS

CYCLES

089

019

2.22

2.5

Courtesy of NationalSwitchgear.com

GEK

7351

This

data

for

the

ohm

basic

reach

tap

settings

setting

will

lower

The

burden

for

the

1.5

and

the

0.75

ohm

tap

POTENTIAL

CIRCUITS

The

maximum

potential

burden

imposed

each

potential

transformer

120

volts

and

cycles

listed

below

CIRCUIT

WATTS

Polarizing

1300

680

0.89

8.7

9.8

Restraint

4.5

3200

1.0

4.5

The

potential

burden

the

mho

unit

maximum

when

the

restraint

tap

set

100

The

restraint

circuit

burden

and

hence

the

total

burden

will

decrease

when

the

restraint

tap

setting

less

than

100

The

potential

burden

tap

settings

less

than

100

can

calculated

from

the

following

formula

Tap

Setting

(

)

(

)

The

terms

(

)

(

)

represent

the

burdens

the

mho

unit

potential

circuit

expressed

watts

and

vars

with

their

taps

100

The

values

for

these

terms

are

shown

below

100

TERM

CIRCUIT

TERM

(

WATTS

VARS

)

(

WATTS

VARS

)

(

4.5

)

(

8.7

4.5

)

(

)

(

)

RESTRAINT

POLARIZING

MECHANICAL

ADJ

Check

Points

Unit

Rotating

Shaft

End

Play

Contact

Gap

Contact

Wipe

(

Contacts

)

010

015

inch

030

035

inch

003

005

inch

SERVICING

The

phase

shifter

phase

angle

meter

method

testing

the

CEY

relay

Connect

the

relay

per

Figure

except

(

)

stud

(

)

stud

and

jumper

studs

and

Directional

Tests

Put

the

reach

taps

int

1.5

ohm

position

Set

current

for

amperes

and

the

voltage

for

120

volts

Set

the

phase

angle

285

degrees

(

degrees

lag

)

Reduce

the

voltage

Vary

the

current

from

amperes

the

unit

should

develop

slight

opening

torque

Adjust

the

core

this

test

fails

refer

figure

The

core

can

rotated

360

degrees

without

having

loosen

any

part

the

assembly

This

adjustment

done

using

special

core

adjusting

wrench

(

Cat

0178

9455

)

which

fits

only

octagon

nut

figure

Set

the

voltage

2.0

volts

and

current

amperes

and

adjust

the

control

spring

until

the

unit

just

closes

Then

increase

the

current

amperes

and

the

contact

should

remain

closed

Courtesy of NationalSwitchgear.com

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