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GEK

-

86653

C

INSTRUCTIONS

RECLOSER

RELAYS

TYPE

SLR

12

A

and

SLR

12

B

GENERAL

ELECTRIC

Courtesy of NationalSwitchgear.com

GEK

-

86653

CONTENTS

PAGE

INTRODUCTION

4

DESCRIPTION

4

APPLICATION

4

Block

Instantaneous

Tripping

Block

Automatic

Tap

Changer

.

Selective

Reclosing

Synchronism

Check

Delayed

Reset

.

Pause

Function

Special

Input

Capabilities

Setting

Up

the

SLR

12

to

Operate

as

an

SLR

11

5

6

6

7

7

Dual

Use

8

8

8

OPERATION

9

SLR

12

Inputs

and

Outputs

Basic

Operation

Additional

Features

DC

Power

Supply

AC

Power

Supply

Printed

Circuit

Board

Assembly

Settings

Programming

Read

Power

Up

and

Power

Down

Ratings

Burdens

9

10

11

13

13

13

14

15

18

22

24

25

TESTING

25

Recloser

Self

Test

Dielectric

Tests

.

.

Functional

Test

.

.

.

25

27

28

INSTALLATION

31

31

Receiving

,

Handling

and

Storage

Case

Mounting

Connections

Relay

Removal

and

Insertion

.

.

.

.

31

32

32

32

RENEWAL

PARTS

32

CAUTIONS

33

33

WARNING

2

Courtesy of NationalSwitchgear.com

GEK

-

86653

TABLES

,

TIMING

DIAGRAM

AND

FIGURES

TABLES

Interrupting

Ratings

of

Telephone

-

Type

Relay

Contacts

Interrupting

Ratings

of

Auxiliary

Relay

Contacts

Input

VA

and

Power

Ratings

Hipot

Circuit

Groups

24

I

24

II

25

III

27

IV

22

TIMING

DIAGRAM

FIGURES

Elementary

Diagram

Showing

Typical

External

Connections

to

the

SLR

12

A

Elementary

Diagram

Showing

Typical

External

Connections

to

the

SLR

12

B

Use

of

Contact

to

Block

Instantaneous

Trip

Circuit

Prior

to

First

Reclosure

RI

and

Delayed

Trip

Diagrams

Connections

for

two

Separate

Single

-

Shot

Reclosures

,

Each

With

a

Different

Time

Delay

Connections

for

Synchronism

Check

Function

Delay

Reset

for

Ground

Faults

Pause

Function

Internal

Connections

for

SLR

12

A

Internal

Connections

for

SLR

12

B

DC

Power

Supply

AC

Power

Supply

Nameplate

Relay

and

Power

Supply

Logic

and

Control

r

.

.

.

Functional

Test

Diagrams

SLR

12

A

Relay

,

Side

View

(

Power

Supply

)

SLR

12

B

Relay

,

Side

View

(

Power

Supply

)

SLR

12

Relay

,

Side

View

(

Relay

and

Power

Supply

)

SLR

12

Relay

,

Rear

View

(

Surge

Board

)

Outline

and

Panel

Drilling

Dimensions

for

SLR

Relay

.

.

1

.

34

2

.

35

3

.

36

4

.

37

5

.

38

38

6

.

39

7

.

Dual

Use

39

8

.

40

9

.

41

10

.

42

11

.

43

12

.

44

13

.

45

14

.

46

15

.

47

16

.

48

17

.

49

18

.

50

19

.

51

20

.

52

21

.

(

8043813

)

SLR

12

Relay

(

In

Case

)

Cover

photograph

:

These

instructions

do

not

purport

to

cover

all

details

or

variations

in

equipment

nor

provide

for

every

possible

contingency

to

be

met

in

connection

with

installation

,

operation

or

maintenance

.

Should

further

information

be

desired

or

should

particular

problems

arise

which

are

not

covered

sufficiently

for

the

purchaser

'

s

purposes

,

the

matter

should

be

referred

to

the

General

Electric

Company

.

To

the

extent

required

the

products

described

herein

meet

applicable

ANSI

,

IEEE

and

NEMA

standards

;

but

no

such

assurance

is

given

with

respect

to

local

codes

and

ordinances

because

they

vary

greatly

.

3

Courtesy of NationalSwitchgear.com

GEK

-

86653

INTRODUCTION

The

SLR

12

A

and

SLR

12

B

relays

can

be

used

to

reclose

a

breaker

up

to

four

times

following

tripping

by

protective

relays

.

These

relays

can

be

set

to

provide

one

instantaneous

(

no

intentional

delay

)

and

three

time

-

delayed

reclosures

.

Any

,

or

all

,

of

the

reclosures

can

be

disabled

.

The

SLR

12

A

relay

is

designed

for

use

with

DC

voltages

(

48

,

110

,

125

,

220

,

250

)

,

whereas

the

SLR

12

B

relay

is

designed

for

use

with

AC

voltages

(

120

/

240

)

.

Typical

external

connections

to

the

SLR

12

A

and

SLR

12

B

relays

are

shown

in

Figures

1

and

2

respectively

.

DESCRIPTION

The

SLR

12

relays

are

microprocessor

-

controlled

and

designed

for

use

in

the

reclosing

of

a

circuit

breaker

following

tripping

by

protective

relays

.

Up

to

four

reclosures

can

be

selected

,

with

one

being

instantaneous

and

the

other

three

being

settable

over

various

time

ranges

.

Additional

features

,

to

be

discussed

subsequently

,

are

also

included

.

A

Liquid

Crystal

Display

(

LCD

)

is

included

in

the

relay

to

display

all

settings

that

are

directly

programmable

from

the

front

of

the

relay

.

Programming

is

done

via

a

set

of

four

CODE

switches

,

a

set

of

4

NUMBER

switches

and

an

ENTER

button

(

see

the

nameplate

,

Figure

13

,

for

details

)

.

The

CODE

switches

(

set

to

1

or

0

)

are

used

to

select

which

setting

is

to

be

made

,

whereas

the

NUMBER

switches

(

set

to

IN

or

OUT

)

are

used

to

make

the

actual

setting

.

After

the

CODE

and

NUMBER

switches

have

been

set

,

the

ENTER

button

is

pushed

to

store

the

setting

in

the

relay

.

Further

details

can

be

found

under

the

Settings

section

.

Settings

can

be

checked

by

pushing

the

READ

button

,

which

will

cause

the

settings

to

be

sequentially

displayed

on

the

LCD

(

see

Read

section

)

.

The

READ

button

can

be

pushed

at

any

time

to

check

the

settings

.

The

recloser

is

also

programmed

to

perform

a

self

-

test

by

pushing

the

TEST

button

,

which

will

cause

the

recloser

to

go

through

its

operating

sequence

without

energizing

the

output

relays

(

see

TESTING

section

)

.

The

READ

and

TEST

buttons

can

be

pushed

at

any

time

without

the

need

for

removing

the

recloser

from

service

:

however

,

the

relay

must

be

enabled

for

the

TEST

button

to

work

.

If

a

reclosing

operation

is

called

for

during

either

the

test

or

read

sequence

,

they

will

be

overridden

and

the

recloser

will

then

run

through

its

normal

operating

sequence

.

APPLICATION

The

SLR

12

relays

can

be

used

to

close

a

circuit

breaker

up

to

four

times

following

tripping

by

protective

relays

.

Any

,

or

all

,

of

the

reclosures

can

be

selected

.

If

all

four

reciosures

are

selected

,

the

first

reclosure

will

always

be

instantaneous

,

4

Courtesy of NationalSwitchgear.com

GEK

-

86653

If

three

,

or

less

,

reclosures

are

followed

by

three

time

-

delayed

reclosures

,

selected

,

all

three

may

be

time

delayed

,

or

one

instantaneous

reclosure

followed

by

one

or

two

delayed

reclosures

may

be

used

.

intentional

time

delay

.

The

reclosure

and

reset

times

are

as

follows

:

The

instantaneous

reclosure

has

no

TIKE

RANGE

SECONDS

RESOLUTION

MULTIPLIER

Instantaneous

Reclosure

No

delay

0.1

to

15.9

First

Timed

Reclosure

0.1

/

Second

Timed

Reclosure

1.0

to

159

1.0

0.5

,

1.0

,

2.0

,

4.0

1.0

to

159

1.0

Third

Timed

Reclosure

1.0

to

159

Reset

Time

1.0

The

time

multiplier

works

on

all

time

ranges

concurrently

:

i

.

e

.

,

it

is

not

possible

to

change

only

one

time

range

.

The

multiplier

has

no

effect

on

the

instantaneous

reclosure

.

Typical

external

connections

to

the

SLR

12

A

and

SLR

12

B

relays

are

shown

in

Figures

1

and

2

respectively

.

These

diagrams

illustrate

the

connections

to

be

used

in

simple

,

straightforward

applications

without

any

special

requirements

such

as

synchronism

check

,

delayed

reset

,

etc

.

These

special

requirements

will

be

discussed

separately

.

A

breaker

control

switch

(

52

CS

)

and

breaker

auxiliary

"

a

"

and

"

b

"

switches

are

required

as

shown

in

the

connections

.

A

control

switch

contact

(

5

-

5

C

)

that

is

closed

only

in

the

"

close

"

and

"

normal

after

close

"

positions

is

employed

to

prevent

automatic

reclosing

of

the

breaker

following

a

manual

trip

.

With

this

switch

arrangement

,

the

relay

will

sense

that

reclosing

is

being

prevented

,

and

it

will

go

to

lockout

when

it

tries

to

close

the

breaker

following

a

manual

trip

.

The

SLR

12

relays

have

many

unique

features

and

a

great

deal

of

flexibility

in

how

they

may

be

employed

.

Following

is

a

description

of

how

these

features

can

be

used

in

some

special

applications

.

Please

refer

to

the

OPERATION

section

for

specific

details

on

each

of

the

functions

used

in

these

applications

.

The

figures

used

in

the

following

descriptions

apply

only

to

the

pertinent

input

connections

.

Refer

to

the

overall

elementaries

,

Figures

1

and

2

,

for

the

remainder

of

the

connections

.

Block

Instantaneous

Tripping

It

is

sometimes

desirable

on

distribution

circuits

to

block

the

instantaneous

trip

circuits

after

the

first

trip

but

before

the

first

reclosure

is

completed

,

thus

providing

for

coordination

with

branch

circuit

fuses

.

This

can

be

implemented

with

the

normally

-

closed

BI

contact

as

shown

in

the

simplified

connection

diagram

of

Figure

3

.

The

diagram

represents

an

application

with

time

overcurrent

(

TOC

)

and

instantaneous

overcurrent

(

IOC

)

functions

.

Note

that

the

BI

contact

opens

at

the

first

selected

reclosure

and

stays

open

during

the

remainder

of

the

reclosing

cycle

,

and

in

the

lockout

position

if

reclosing

proves

to

be

unsuccessful

.

A

contact

of

the

breaker

control

switch

is

shown

,

connected

across

the

BI

contact

.

This

control

switch

contact

,

which

is

closed

in

the

"

close

"

position

of

the

switch

,

is

used

to

re

-

establish

the

instantaneous

trip

circuit

when

the

breaker

is

manually

reclosed

with

the

SLR

relay

in

the

lockout

position

.

5

Courtesy of NationalSwitchgear.com

GEK

-

86653

It

is

also

possible

to

use

the

normally

-

closed

RS

contact

to

block

instantaneous

tripping

.

second

,

delayed

reclosure

and

thus

allow

instantaneous

tripping

to

occur

two

,

or

even

three

,

times

rather

than

just

once

,

as

can

be

done

with

the

BI

contact

,

that

the

RS

function

can

be

set

to

drop

out

at

the

lockout

position

;

thus

,

instantaneous

tripping

is

re

-

instated

at

that

time

and

it

is

not

necessary

to

use

the

control

switch

contact

described

in

the

preceding

paragraph

.

Block

Automatic

Tap

Changer

In

this

case

,

RS

can

be

set

to

pick

up

after

the

first

,

or

even

the

Note

The

normally

-

closed

RS

contact

can

be

used

to

block

the

automatic

tap

changer

circuit

during

the

reclosing

cycle

.

The

RS

contact

would

typically

be

set

to

open

at

the

start

of

the

reclosing

cycle

and

to

close

when

lockout

is

reached

.

Selective

Reclosing

In

some

applications

it

may

be

desirable

to

initiate

instantaneous

plus

delayed

reclosures

following

a

high

-

speed

trip

,

but

to

allow

delayed

reclosures

only

,

following

a

time

-

delayed

trip

.

This

can

be

accomplished

by

applying

a

signal

from

the

time

delay

trip

bus

to

the

DR

input

of

the

SLR

relays

as

shown

in

Figure

4

.

With

this

connection

,

the

recloser

will

skip

the

instantaneous

reclosure

(

or

the

first

selected

reclosure

)

and

go

immediately

to

the

next

selected

reclosure

.

It

is

possible

to

use

the

high

-

speed

reclose

initiate

(

RI

)

output

from

the

protective

relaying

scheme

to

initiate

the

reclose

cycle

,

but

it

must

be

parallelled

by

a

breaker

"

b

"

switch

contact

as

shown

in

Figure

4

to

ensure

completion

of

the

reclose

cycle

.

It

is

also

possible

to

set

the

SLR

relays

to

provide

two

separate

single

-

shot

reclosures

,

with

each

reclosure

having

a

different

time

delay

,

might

be

desirable

to

provide

a

single

-

shot

of

reclosing

with

a

long

time

delay

for

ground

faults

,

but

to

provide

a

single

-

shot

of

faster

reclosing

for

phase

faults

.

This

can

be

accomplished

via

the

connections

shown

in

Figure

5

.

example

,

that

a

single

-

shot

instantaneous

reclosure

is

required

following

phase

faults

,

but

that

a

single

-

shot

time

-

delayed

reclosure

is

required

following

ground

faults

.

To

do

this

,

make

the

connections

shown

in

Figure

5

with

a

contact

from

the

ground

fault

detection

circuit

connected

to

the

DR

input

(

select

single

-

shot

No

.

2

)

of

the

SLR

relay

.

Make

the

following

settings

:

Select

instantaneous

(

INST

)

and

first

(

1

st

)

reclosure

.

For

example

,

it

Assume

,

as

an

1

.

Set

the

first

reclosure

time

delay

to

that

required

for

ground

faults

.

2

.

Set

pause

control

jumper

P

9

to

the

IN

position

3

.

4

.

Set

pause

select

jumper

P

10

in

the

1

to

A

position

Set

pause

time

setting

to

zero

(

0

)

5

.

Set

appropriate

reset

time

.

6

.

6

Courtesy of NationalSwitchgear.com

GEK

-

86653

With

these

connections

and

settings

the

following

will

occur

.

For

phase

faults

-

when

a

phase

fault

occurs

,

there

will

be

no

DR

input

to

the

SLR

relay

.

Consequently

,

when

the

breaker

trips

and

the

"

b

"

switch

closes

,

the

SLR

relay

will

initiate

an

instantaneous

reclose

output

to

close

the

breaker

.

At

the

same

time

,

the

BI

contacts

will

open

to

remove

the

pause

input

.

If

the

reclosure

is

successful

,

the

SLR

will

reset

following

the

reset

time

(

BI

contacts

will

close

at

that

time

)

.

If

the

reclosure

is

not

successful

and

the

breaker

retrips

,

the

SLR

will

count

down

the

first

reclose

time

and

then

try

to

close

the

breaker

.

Reclosing

will

not

be

permitted

,

however

,

because

of

the

open

pause

input

,

and

the

SLR

will

then

immediately

go

to

lockout

.

Thus

,

only

one

reclosure

is

permitted

.

For

ground

faults

-

when

a

ground

fault

occurs

,

there

will

be

an

input

applied

to

the

DR

input

of

the

relay

(

must

be

applied

before

"

b

"

closes

)

.

At

that

time

,

the

instantaneous

reclosure

will

be

skipped

and

the

SLR

will

start

to

count

down

to

the

first

reclosure

when

the

"

b

"

switch

closes

.

The

breaker

will

thus

be

closed

following

a

delay

equal

to

the

first

reclose

time

,

reclosure

is

successful

,

the

SLR

will

go

to

reset

.

If

the

breaker

retrips

,

the

SLR

will

go

immediately

to

lockout

.

Flere

too

,

only

one

reclosure

is

allowed

.

1

.

2

.

If

the

Synchronism

Check

Synchronism

check

may

be

used

with

the

SLR

reclosers

via

the

pause

input

,

as

shown

in

Figure

6

.

In

this

connection

,

the

synchronism

check

contact

must

be

closed

when

the

system

is

in

synchronism

and

open

when

the

system

is

out

of

synchronism

.

Thus

,

when

a

reclose

is

called

for

it

will

be

permitted

if

the

system

is

in

synchronism

,

or

blocked

if

the

system

is

out

of

synchronism

.

The

pause

time

setting

is

the

time

that

is

permitted

for

a

synchronism

check

input

to

be

produced

and

is

started

when

a

reclose

output

is

called

for

.

If

a

synchronism

check

input

is

not

present

when

the

pause

time

elapses

,

the

SLR

will

go

immediately

to

lockout

.

Note

that

a

synchronism

check

input

is

required

at

all

selected

reclosures

when

the

pause

function

is

implemented

.

If

it

is

desired

not

to

synchronism

check

a

reclosure

,

some

means

must

be

used

to

bypass

the

synchronism

check

input

at

the

reclosure

where

synchronism

check

is

not

wanted

.

For

example

,

the

RS

normally

-

closed

contact

may

be

used

to

eliminate

the

synchronism

check

requirement

for

an

instantaneous

reclosure

by

connecting

it

as

shown

dotted

in

Figure

6

.

For

this

connection

to

be

effective

for

the

described

condition

,

RS

should

be

set

to

pick

up

with

0

time

and

to

drop

out

at

lockout

.

In

this

way

,

synchronism

check

will

be

required

on

all

delayed

reclosures

but

not

on

the

instantaneous

reclosure

.

Delayed

Reset

Some

applications

may

require

a

delay

in

(

extension

of

)

the

reset

time

to

allow

certain

events

to

occur

before

the

SLR

is

allowed

to

go

to

reset

.

For

example

,

it

may

take

a

time

overcurrent

function

a

very

long

time

to

operate

for

low

-

level

ground

faults

,

whereas

the

phase

time

overcurrent

functions

may

operate

very

quickly

.

Thus

,

long

reset

times

may

be

required

to

accommodate

the

low

-

level

ground

faults

,

whereas

shorter

reset

times

may

be

required

for

phase

faults

.

The

pause

input

to

the

SLR

relays

can

be

used

to

accomplish

this

requirement

.

A

simplified

connection

diagram

to

meet

this

requirement

is

shown

in

Figure

7

.

Note

that

a

sensitively

-

set

instantaneous

overcurrent

(

IOC

)

function

and

an

auxiliary

function

79

X

are

required

.

With

this

connection

,

the

pause

input

will

be

open

whenever

IOC

operates

.

The

pause

time

will

last

as

long

as

IOC

is

picked

up

or

until

the

pause

time

elapses

,

and

the

reset

time

will

be

extended

accordingly

.

In

this

way

,

time

will

be

allowed

for

the

TOC

to

operate

before

the

SLR

resets

.

7

Courtesy of NationalSwitchgear.com

GEK

-

86653

Pause

Function

-

Dual

Use

Two

separate

and

distinct

applications

have

been

described

using

the

pause

function

.

It

is

possible

to

use

the

pause

function

during

both

reclose

and

reset

,

but

special

connections

are

required

,

as

shown

in

Figure

8

.

Note

that

although

the

synchronism

check

and

reset

delay

functions

are

totally

isolated

in

this

example

,

they

both

operate

for

a

common

pause

time

;

i

.

e

.

,

it

is

not

possible

to

use

separate

pause

time

settings

when

the

pause

function

is

used

for

a

dual

purpose

.

Special

Input

Capabilities

There

are

4

special

input

capabilities

designed

into

the

SLR

12

recloser

to

increase

the

flexibility

in

its

application

.

A

signal

on

the

DR

input

will

cause

the

recloser

to

skip

the

first

selected

reclose

.

(

The

SLR

11

was

designed

to

skip

Instantaneous

with

a

DR

signal

.

)

1

.

The

recloser

can

now

be

set

up

as

a

1

shot

recloser

with

a

short

-

time

or

long

-

time

delay

using

the

DR

input

.

(

The

52

a

input

The

reclose

cycle

can

be

operated

using

the

52

b

input

only

,

stud

#

9

must

be

connected

to

relay

stud

#

2

on

the

SLR

12

A

or

to

stud

#

4

on

the

SLR

12

B

.

)

2

.

This

connection

was

included

in

the

design

for

applications

where

only

one

signal

was

available

for

reclosing

;

it

requires

that

the

signal

have

a

bounce

time

less

than

16

milliseconds

.

reclosing

where

a

52

a

and

a

52

b

signal

are

available

!

During

the

reset

time

(

52

a

closed

and

52

b

open

)

the

recloser

can

be

returned

to

the

reset

condition

by

opening

52

a

for

.

3

seconds

or

more

.

When

52

a

closes

,

the

recloser

will

go

to

reset

.

This

connection

is

not

recommended

for

3

.

During

the

reclose

time

(

52

a

open

and

52

b

closed

)

,

the

recloser

can

be

put

directly

into

the

lockout

condition

by

opening

52

b

for

.

3

seconds

or

more

.

When

52

b

closes

,

the

recloser

will

go

to

lockout

.

4

.

Setting

Up

the

SLR

12

to

Operate

as

an

SLR

11

The

The

SLR

12

is

designed

to

operate

as

a

direct

replacement

for

the

SLR

11

.

following

is

the

procedure

for

setting

the

SLR

12

to

operate

in

an

SLR

11

case

without

changing

any

wiring

to

the

SLR

11

case

.

Set

P

9

to

the

out

position

.

Set

Pll

to

the

B

to

2

position

.

Set

P

6

to

the

N

.

O

.

position

.

Set

P

7

to

the

N

.

C

.

position

.

If

the

SLR

12

B

(

AC

recloser

)

is

being

used

,

set

PI

to

the

correct

voltage

.

Program

the

recloser

.

1

.

2

.

3

.

4

.

5

.

6

.

8

Courtesy of NationalSwitchgear.com

GEK

-

86653

It

should

be

noted

that

the

SLR

12

does

not

need

a

manual

close

signal

(

Stud

8

on

the

SLR

11

)

.

With

P

9

set

to

the

OUT

position

,

any

signal

at

Stud

8

of

the

relay

case

will

be

ignored

.

With

the

signal

at

stud

8

ignored

,

the

position

of

P

10

is

irrelevant

.

Because

Stud

11

is

not

used

on

the

SLR

11

case

,

the

position

of

P

8

is

irrelevant

.

OPERATION

SLR

12

Inputs

and

Outputs

The

SLR

12

family

of

relays

consists

of

2

models

,

input

with

an

input

voltage

of

48

,

125

,

250

volts

DC

(

see

Figure

9

)

.

designed

for

an

AC

input

with

an

input

voltage

of

120

/

240

volts

AC

(

see

Figure

10

)

.

The

SLR

12

A

is

designed

for

a

DC

The

SLR

12

B

is

Each

model

has

4

inputs

and

5

outputs

as

listed

below

.

Inputs

:

"

Delayed

Reclose

"

is

used

to

skip

the

first

selected

reclose

signal

.

"

Pause

"

is

used

to

delay

the

start

of

the

reclose

signal

,

or

to

extend

the

reset

time

,

or

both

.

Auxiliary

contacts

of

the

circuit

breaker

used

to

indicate

the

state

of

the

breaker

.

DR

P

52

a

,

52

b

Outputs

:

"

In

Progress

"

is

used

to

indicate

that

the

recloser

is

in

progress

for

a

reclose

or

reset

.

"

Relay

Spare

"

is

an

auxiliary

relay

which

can

be

operated

at

any

selected

reclose

with

adjustable

pickup

and

dropout

times

.

"

Lockout

"

is

used

to

indicate

the

relay

is

in

lockout

,

stud

15

is

shared

by

IP

and

L

0

.

)

"

Block

Instantaneous

"

operates

at

the

first

reclose

signal

and

remains

on

until

the

recloser

is

reset

.

"

Reclose

"

is

the

reclose

signal

.

The

reclose

relay

is

a

telephone

type

that

is

mounted

with

its

contacts

visible

through

the

front

of

the

SLR

relay

case

.

It

should

be

noted

that

shorting

bars

are

used

across

the

normally

-

closed

contacts

of

RS

and

BI

to

complete

the

circuits

if

the

connection

plug

is

withdrawn

from

the

case

.

IP

RS

(

Note

that

L

0

BI

REC

Surge

capacitors

are

installed

from

all

input

and

output

circuits

to

surge

ground

.

9

Courtesy of NationalSwitchgear.com

GEK

-

86653

Basic

Operation

The

recloser

is

not

enabled

until

all

of

the

CODE

switches

are

placed

in

the

"

1

"

position

and

the

ENTER

button

pushed

.

Note

that

the

NUMBER

switches

in

this

case

control

the

state

of

the

BI

,

RS

,

IP

and

LC

relays

on

loss

of

and

return

of

power

(

see

step

7

in

the

Programming

section

)

.

The

CODE

switches

must

all

be

left

in

the

"

1

"

position

for

the

recloser

to

remain

enabled

.

If

any

of

the

switches

are

set

to

"

0

"

,

the

recloser

will

be

disabled

and

will

not

respond

to

any

external

input

If

any

of

the

switches

are

set

to

"

0

"

,

the

LCD

display

will

be

blank

,

When

the

recloser

is

enabled

,

it

will

commands

.

indicating

that

the

recloser

is

disabled

,

display

RES

.

if

it

is

in

reset

or

L

.

O

.

and

B

.

I

.

if

it

is

in

lockout

.

Once

the

recloser

is

enabled

,

operation

is

controlled

by

the

breaker

auxiliary

"

a

"

and

"

b

"

switches

and

the

breaker

control

switch

52

CS

.

2

,

which

show

typical

external

connections

to

the

SLR

relays

.

Please

refer

to

Figures

1

and

If

the

breaker

is

closed

when

the

recloser

is

enabled

,

it

will

recognize

that

the

"

a

"

switch

is

closed

,

and

that

the

"

b

"

switch

is

open

,

and

will

"

awaken

"

in

the

reset

(

RES

)

position

.

RES

.

will

be

displayed

on

the

LCD

.

If

the

breaker

is

open

when

the

recloser

is

enabled

,

the

auxiliary

switches

will

be

in

the

opposite

state

;

the

recloser

will

recognize

this

and

it

will

"

awaken

"

in

the

L

0

"

Lockout

"

position

.

L

.

O

.

and

B

.

I

.

will

be

displayed

on

the

LCD

.

When

the

breaker

is

closed

manually

,

the

auxiliary

switches

will

transfer

state

(

"

a

"

closes

,

"

b

"

opens

)

and

the

recloser

will

start

to

count

down

from

a

time

equal

to

the

reset

setting

(

this

can

be

observed

on

the

LCD

)

.

At

the

end

of

the

reset

period

,

the

recloser

will

assume

the

reset

position

and

RES

.

will

be

displayed

on

the

LCD

.

If

the

breaker

were

to

trip

as

the

recloser

was

counting

down

,

the

auxiliary

switches

would

again

change

state

and

the

recloser

would

immediately

go

to

the

lockout

position

,

thus

preventing

any

further

reclosures

.

At

that

time

,

L

.

O

.

and

B

.

I

.

would

be

displayed

on

the

LCD

.

If

the

breaker

is

tripped

manually

,

the

recloser

will

count

down

to

the

first

reclosure

selected

(

no

countdown

if

instantaneous

was

selected

)

and

at

that

time

will

produce

an

output

to

reclose

the

breaker

,

however

,

because

the

5

-

5

C

contacts

of

the

control

switch

(

52

CS

)

will

be

open

at

that

time

.

At

the

instant

that

the

reclose

output

is

produced

,

the

recloser

will

check

to

see

if

the

breaker

auxiliary

switches

transfer

,

i

.

e

.

closes

.

A

time

limit

is

built

into

the

recloser

for

this

transfer

to

occur

,

and

is

equal

to

0.9

times

the

time

multiplier

in

seconds

(

see

Set

Time

Multiplier

in

the

Programming

section

)

.

Thus

,

if

a

time

multiplier

of

1.0

is

selected

,

the

transfer

of

the

auxiliary

switches

must

occur

within

0.9

seconds

after

a

reclose

output

is

produced

.

If

the

transfer

does

not

occur

within

this

time

period

,

the

recloser

will

immediately

go

to

lockout

,

following

a

manual

trip

,

the

recloser

will

go

to

lockout

following

any

manual

trip

.

THE

ABOVE

-

DESCRIBED

TIME

LIMIT

APPLIES

ANY

TIME

THAT

THE

RECLOSER

PRODUCES

A

RECL

0

SE

OUTPUT

.

No

reclosure

will

take

place

,

if

"

b

"

opens

and

"

a

"

Since

reclosing

is

prevented

by

the

control

switch

If

the

breaker

is

tripped

by

the

protective

relays

,

the

5

-

5

C

contacts

of

the

control

switch

will

be

closed

,

and

the

recloser

will

go

through

its

programmed

sequence

following

closure

of

the

"

b

"

switch

.

When

the

first

reclosure

point

is

reached

,

a

reclose

output

will

be

produced

to

close

the

breaker

.

If

the

breaker

closes

successfully

as

indicated

by

a

transfer

of

the

auxiliary

switches

within

the

specified

time

limit

,

the

recloser

will

start

to

count

down

to

reset

.

If

no

tripping

occurs

during

this

period

,

the

recloser

will

reset

and

be

ready

to

initiate

another

complete

reclose

cycle

when

called

for

.

If

a

trip

does

occur

during

the

reset

period

,

the

recloser

will

then

go

on

to

the

next

reclosure

,

if

one

has

10

Courtesy of NationalSwitchgear.com