GE SLYG81A User manual

INSTRUCTIONS

GEK

49813

STATIC

THREE

PHASE

DIRECTIONAL

GROUND

DISTANCE

RELAY

TYPE

SLYG

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

49813

CONTENTS

PAGE

DESCRIPTION

APPLICATION

RATINGS

GENERAL

SURGE

WITHSTAND

CAPABILITY

POWER

SUPPLY

CONTACTS

TARGET

CHARACTERISTICS

OPERATING

PRINCIPLES

OPERATING

TIME

SENSITIVITY

BURDENS

CIRCUIT

DESCRIPTION

CALCULATION

SETTINGS

FIRST

ZONE

RELAY

SETTING

SECOND

ZONE

RELAY

SETTING

CONSTRUCTION

RECEIVING

HOLDING

AND

STORAGE

ACCEPTANCE

TESTS

VISUAL

INSPECTION

MECHANICAL

INSPECTION

CASE

AND

CRADLE

BLOCKS

TARGET

UNIT

TELEPHONE

RELAY

ELECTRICAL

TESTS

GENERAL

DIELECTRIC

TESTS

DETAILED

TESTING

INSTRUCTIONS

INSTALLATION

PROCEDURE

INTRODUCTION

SURGE

GROUND

AND

RELAY

CASE

GROUND

CONNECTIONS

TEST

PLUGS

INSTALLATION

TESTS

PERIODIC

TESTING

AND

ROUTINE

MAINTENANCE

CONTACTS

ELECTRICAL

TESTS

SERVICING

RENEWAL

PARTS

CAUTION

ADDITIONAL

CAUTION

APPENDIX

LIST

FIGURES

Cover

Photo

(

8043551

)

Courtesy of NationalSwitchgear.com

GEK

49813

STATIC

THREE

PHASE

DIRECTIONAL

GROUND

DISTANCE

RELAY

TYPE

SLYG

DESCRIPTION

The

Type

SLYG

relay

three

phase

first

second

zone

static

ground

distance

relay

available

with

ratings

hertz

amperes

;

hertz

amperes

;

hertz

ampere

Five

ampere

rated

relays

are

available

with

continuously

adjustable

ohmic

reach

ranges

0.1

ohms

0.75

ohms

One

ampere

rated

relays

are

available

with

continuously

adjustable

ohmic

reach

ranges

0.5

ohms

3.75

150

ohms

power

supply

voltages

available

are

110

125

250

volt

rating

available

with

external

pre

regulator

Contact

outputs

are

provided

for

tripping

(

two

contacts

each

with

target

)

and

there

contact

connected

positive

for

auxiliary

functions

The

relay

mounted

deep

large

size

double

ended

drawout

(

)

case

The

Type

SLYG

relay

may

used

stepped

distance

protection

the

first

second

third

zone

ground

protection

may

also

used

underreaching

overreaching

tripping

relay

any

the

directional

comparison

scheme

the

directional

comparison

scheme

uses

ground

distance

blocking

relays

the

Type

SLYG

blocking

relay

(

described

instruction

book

GEK

49814

)

should

used

the

scheme

coordinate

with

the

SLYG

tripping

relay

The

SLYG

has

variable

mho

characteristic

which

provides

optimum

accommodation

fault

resistance

The

functional

block

diagram

shown

Figure

The

internal

connections

are

shown

Figure

and

the

external

connections

are

shown

Figure

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

purchaser

purposes

the

matter

should

referred

the

General

Electric

Company

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

49813

APPLICATION

The

SLYG

utilizes

four

input

phase

angle

comparator

for

ground

distance

measurement

for

each

phase

The

four

inputs

for

the

phase

ground

measurement

are

(

)

ZRI

KOIOZRO

TVAG

Operating

Quantity

Polarizing

Quantity

(

)

VRG

(

)

KQIOZRO

Polarizing

Quantity

Overcurrent

Supervision

(

)

IQZRO

where

the

faulted

phase

current

the

zero

sequence

component

the

phase

(

positive

and

negative

sequence

)

base

reach

tap

with

impedance

angle

the

neutral

(

zero

sequence

)

base

reach

with

impedance

angle

the

adjustable

phase

ground

restraint

voltage

the

quadrature

voltage

shifted

leading

•

ZRI

ZRO

TVAG

VRrZ

ratio

tap

compensate

for

the

magnitude

ratio

between

the

zero

and

positive

sequence

lines

impedance

design

constant

(

0.5

per

unit

)

the

zero

sequence

voltage

atthe

relay

The

use

four

input

comparator

produces

many

advantages

over

designs

simplifying

the

application

ground

distance

relay

for

either

first

second

zone

applications

The

first

and

second

inputs

(

and

)

the

comparator

produce

the

well

known

quadrature

polarized

ground

distance

unit

with

variable

mho

characteristic

The

variable

mho

characteristic

increases

size

the

source

impedance

increases

accommodate

increasing

fault

resistance

The

use

the

second

polarizing

quantity

(

)

ricts

the

distance

measurement

the

faulted

phase

thereby

eliminating

the

need

for

checking

the

unfaulted

phase

unit

for

incorrect

directional

sensing

unusual

sequence

current

distribution

factors

overreaching

heavy

load

transfer

The

second

polarizing

quantity

(

)

also

precludes

the

possibility

the

distance

unit

overreaching

double

line

ground

fault

with

high

zero

sequence

fault

resistance

The

high

zero

sequence

fault

resistance

can

cause

fault

beyond

the

reach

relay

appear

within

the

operating

characteristic

relay

when

only

the

(

)

and

(

)

inputs

above

are

used

Courtesy of NationalSwitchgear.com

GEK

49813

The

fourth

input

(

)

provides

overcurrent

supervision

prevent

operation

potential

failure

the

line

energizing

transients

that

are

associated

with

lines

with

shunt

reactors

The

line

energizinq

transients

present

problem

relay

operates

the

transient

voltages

just

prior

high

speed

reclosure

addition

the

third

and

fourth

inputs

(

and

)

act

zero

sequence

directional

unit

that

provides

excellent

directional

integrity

The

SLYG

has

adjustable

characteristic

that

adjusted

means

the

timer

setting

the

characteristic

timer

For

short

lines

circular

characteristic

recommended

but

for

longer

lines

with

unusually

heavy

load

transfer

three

terminal

lines

where

very

large

reach

settings

are

applied

lens

shaped

characteristic

recommended

RATINGS

GENERAL

The

Type

SLYG

relay

designed

for

continuous

operation

ambient

temperatures

between

and

per

ANSI

standard

37.90

1978

addition

these

relays

will

not

malfunction

nor

damaged

operated

ambient

The

current

circuits

the

relays

that

are

rated

amperes

rms

will

carry

amperes

rms

continuously

and

will

carry

250

amperes

rms

for

second

The

current

circuits

the

relays

that

are

rated

ampere

rms

will

carry

amperes

rms

continuously

and

will

carry

amperes

rms

for

second

The

potential

circuits

are

rated

volts

rms

line

neutral

and

can

withstand

110

this

value

continuously

These

relays

are

available

with

either

short

long

impedance

ranges

shown

Table

TABLE

AVAILABLE

REACHES

CURRENT

TRANSFORMER

RATING

ZRI

BASE

REACH

TAP

POSITIVE

SEQUENCE

OHMS

IMPEDANCE

RANGE

POSITIVE

SEQUENCE

OHMS

TYPE

0.1

1.0

0.2

2.0

0.4

4.0

AMP

SHORT

0.2

0.4

0.75

7.5

1.5

AMP

LONG

1.5

3.0

0.5

5.0

1.0

10.0

2.0

20.0

SHORT

AMP

1.0

2.0

3.75

37.5

7.5

75.0

15.0

150.0

AMP

LONG

7.5

15.0

Courtesy of NationalSwitchgear.com

GEK

49813

Selection

the

desired

base

reach

tap

(

ZRI

)

made

means

the

four

tap

screws

the

lower

rear

the

relay

(

see

Figure

)

All

four

tap

screws

(

and

neutral

)

must

equal

ohmic

tap

positions

The

relay

reach

(

)

the

relay

continuously

adjustable

within

the

range

shown

Table

for

particular

tap

means

three

gang

precision

potentiometer

the

lower

front

the

relay

(

see

Figure

)

The

turn

dial

this

potentiometer

calibrated

percent

restraint

setting

(

)

and

adjustable

from

(

fully

counterclockwise

)

110

(

fully

clockwise

)

The

maximum

recommended

setting

100

enlarged

picture

the

dial

shown

Figure

The

relay

reach

given

equation

(

)

Relay

Reach

100

ZRI

(

where

Restraint

setting

percent

Relay

reach

ohms

ZRI

Base

reach

tap

position

sequence

ohms

The

relay

should

within

the

value

given

equation

(

)

the

ambient

temperature

within

the

rated

range

SURGE

WITHSTAND

CAPABILITY

These

relays

will

withstand

ANSI

37.90

1974

surge

test

without

incorrect

operation

damage

any

component

POWER

SUPPLY

Models

are

available

with

ratings

cits

(

volts

)

110

volts

(

120

volts

)

125

volts

(

100

140

volts

)

The

power

supply

contains

converter

provide

isolation

between

the

input

control

power

and

the

solid

state

circuitry

the

relay

relays

with

control

voltage

excess

125

volts

external

pre

regulator

used

This

reduces

the

control

voltage

125

volts

suitable

for

input

the

relay

terminals

CONTACTS

All

three

the

output

contacts

the

Type

SLYG

will

make

and

carry

amperes

for

tripping

duty

but

their

continuous

current

ratings

are

limited

the

target

ratings

listed

Table

III

The

interrupting

ratings

are

given

Table

Courtesy of NationalSwitchgear.com

GEK

49813

TABLE

INTERRUPTING

RATINGS

OUTPUT

CONTACTS

AMPS

VOLTS

INDUCTIVEtt

NON

INDUCTIVE

115

0.75

2.0

230

0.5

1.0

VOLTS

1.0

3.0

125

0.5

1.5

250

0.25

0.75

The

inductive

rating

based

ratio

0.04

second

TARGET

Targets

having

0.6

and

ampere

taps

are

provided

for

the

output

contacts

between

studs

and

between

studs

and

The

ratings

each

these

targets

are

qiven

Table

III

TABLE

III

TARGET

RATINGS

0.6

Amp

Tap

2.0

Amp

Tap

Minimum

Operating

Carry

Continuously

Carry

Amps

for

Carry

Amps

for

Resistance

Hertz

Impedance

0.6

amps

1.2

amps

0.5

sec

secs

0.78

ohm

6.2

ohms

2.0

amps

2.6

amps

3.5

secs

0.18

ohm

0.65

ohm

CHARACTERISTICS

OPERATING

PRINCIPLES

The

mho

characteristic

the

SLYG

obtained

converting

relay

currents

into

voltage

signals

(

)

combining

these

signals

with

signals

proportional

the

line

voltage

(

)

and

measuring

the

angle

between

the

appropriate

combinations

obtain

the

desired

characteristic

Currents

are

converted

into

signals

means

transactors

(

and

)

that

are

air

gap

reactors

with

secondary

windings

The

transactors

are

tapped

the

primary

provide

the

basic

ohmic

tap

selection

0.1

0.2

0.4

ohms

for

the

ampere

short

reach

relay

0.75

1.5

ohms

for

the

ampere

long

reach

relay

The

ampere

rated

relay

taps

are

0.5

1.0

2.0

ohms

for

the

short

reach

relay

and

3.75

7.5

and

ohms

for

the

long

reach

relay

Courtesy of NationalSwitchgear.com

GEK

49813

The

the

quantity

the

transfer

impedance

the

transactor

and

equal

VOUT

The

transactor

secondaries

have

resistors

across

them

These

resistors

provide

the

desired

angle

between

VOUT

and

IIN

This

angle

determines

the

base

reach

the

relay

Two

additional

quantities

(

IOZRO

and

CKOIOZRO

)

are

also

compared

provide

security

for

faults

other

than

single

line

ground

The

phase

angle

between

the

four

signals

compared

Coincidence

Logic

(

)

circuit

that

puts

out

rectangular

voltage

pulse

when

these

signals

are

coincident

The

width

this

block

voltage

measured

Integrating

Timer

(

)

circuit

which

provides

trip

signal

output

when

the

pulse

width

exceeds

preset

duration

the

timer

set

for

(

that

4.16

milliseconds

hertz

system

milliseconds

hertz

system

)

circular

characteristic

obtained

the

timer

set

for

less

than

expanded

(

tomato

shaped

)

characteristic

obtained

the

timer

set

for

than

contracted

circle

(

lens

shaped

)

obtained

Relays

are

shipped

from

the

factory

with

the

timer

set

for

The

timing

diagram

for

typical

condition

shown

Figure

the

100

restraint

setting

used

and

set

equal

the

ratio

’

phase

neutral

reach

the

relay

the

angle

equal

the

base

reach

tap

chosen

voltage

tap

other

than

100

chosen

reach

increased

inverse

proportion

the

voltage

tap

For

example

the

voltage

tap

used

relay

operation

still

occurs

for

the

same

voltage

applied

the

measuring

circuit

but

since

the

actual

line

voltage

twice

this

amount

the

relay

reach

twice

great

Relay

reach

the

angle

maximum

reach

can

calculated

from

the

expression

Zfilx

100

where

restraint

setting

percent

ZRI

base

reach

tap

setting

positive

sequence

ohms

relay

reach

positive

sequence

ohms

set

the

relay

for

the

desired

reach

necessary

first

select

the

proper

Base

Reach

Tap

This

tap

should

the

highest

Base

Reach

Tap

”

that

smaller

than

the

desired

ohmic

reach

The

setting

the

Base

Reach

Tap

explained

under

the

section

titled

CONSTRUCTION

this

book

After

the

Base

Reach

Tap

selected

the

Percent

Restraint

Setting

may

now

chosen

produce

the

required

relay

reach

OPERATING

TIME

Operating

time

function

the

length

line

being

protected

the

source

impedance

and

the

location

the

fault

Figure

shows

the

average

operating

time

for

Type

SLYG

relay

when

set

for

first

zone

protection

typical

100

mile

radial

transmission

line

with

source

impedance

equivalent

mile

line

Figure

shows

the

average

operating

time

for

the

same

line

when

the

relay

set

for

second

zone

protection

Courtesy of NationalSwitchgear.com

GEK

49813

SENSITIVITY

Sensitivity

defined

the

steady

state

rms

voltage

current

(

the

relay

terminals

)

required

for

particular

quantity

pick

the

relay

all

quantities

are

the

optimum

phase

relationship

The

nominal

sensitivities

for

the

sign

the

SLYG

relay

are

follows

Polarizing

Sensitivity

(

Quadrature

Polarizing

)

Sensitivity

rated

voltage

Polarizing

Sensitivity

1.25

volts

(

CKQIOZRO

)

Overcurrent

Supervision

Sensitivity

IOZRO

0.2

—

amperes

FOTZRI

ohms

0.2

ZRI

Operate

Circuit

Sensitivity

See

Figure

for

sensitivity

terms

(

)

100

determine

current

sensitivity

the

ratio

must

known

assumed

and

the

ratio

Zoi

must

known

The

current

sensitivity

can

then

determined

from

the

formula

(

)

ZRI

IQKQZRO

where

actual

reach

nominal

reach

For

example

loand

KOZRO

ZRI

then

ZRI

0.16

0.8

ZRI

0.8

For

ZRI

ohms

0.16

amperes

0.48

ZRI

BURDENS

The

potential

circuit

burden

per

phase

volts

rms

line

neutral

voltage

follows

0.2

volt

amperes

0.17

watts

0.10

vars

Courtesy of NationalSwitchgear.com

GEK

49813

The

impedance

each

current

circuit

measured

its

rated

current

shown

Table

below

The

values

are

given

ohms

TABLE

AMPERE

RATED

RELAY

AMPERE

RATED

RELAY

PHASE

GROUND

PHASE

GROUND

0.030

0.018

0.210

0.160

0.027

0.018

0.200

0.150

0.013

0.002

0.065

0.050

The

overall

current

drains

the

control

power

input

(

Studs

and

)

are

follows

RATED

VOLTAGE

VOLTS

RELAY

INPUT

CURRENT

MILLIAMPERES

Dropped

Out

Picked

Dropped

Out

Picked

Dropped

Out

Picked

Dropped

Out

Picked

Out

200

315

110

175

125

155

250

260

250

Input

studs

and

external

pre

regulator

CIRCUIT

DESCRIPTION

The

internal

connections

for

the

Type

SLYG

relay

are

shown

Figure

The

terminal

numbers

the

top

and

bottom

this

diagram

represent

the

external

connections

the

relay

The

external

connections

can

grouped

shown

Table

TABLE

EXTERNAL

CONNECTIONS

TERMINAL

NUMBERS

through

DESCRIPTIONS

Current

Inputs

Contact

(

Other

End

Connected

)

Surge

Ground

Contacts

with

Targets

Potential

Inputs

Control

Power

Input

through

Courtesy of NationalSwitchgear.com

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