ABB SGR-51 User manual

Instruction

Leaflet

41

-

668.1

E

Jill

II

MINI

ABB

Power

T

&

D

Company

Inc

.

Relay

Divisions

Coral

Springs

,

FL

33065

Type

SGR

-

51

Reclosing

Relay

Effective

:

February

1985

Supersedes

l

.

L

41

-

668.1

D

,

Dated

November

1975

©

Denotes

Changed

Since

Close

Reloy

Circuit

APPLICATION

The

close

relay

circuit

consists

of

transistors

Q

7

,

Q

8

,

and

Q

9

,

resistors

R

24

to

R

30

,

and

the

close

relay

.

The

turn

-

off

of

transistor

Q

7

by

the

flip

-

flop

circuit

switches

transistors

Q

8

and

Q

9

to

the

on

state

to

activate

the

close

relay

.

The

SGR

-

51

Reclosing

Relay

provides

for

in

-

stantaneous

reclosure

of

an

electrically

-

operated

cir

-

cuit

breaker

,

and

automatically

resets

itself

if

the

breaker

^

remains

closed

for

a

predetermined

adjust

-

able

time

interval

.

If

the

breaker

retrips

before

the

end

of

this

interval

,

the

resetting

operation

of

the

relay

is

interrupted

until

the

breaker

is

manually

closed

.

Thus

,

the

reclosing

relay

is

applicable

to

either

attended

or

non

-

attended

stations

.

Flip

-

Flop

Set

Circuit

The

flip

-

flop

set

circuit

consists

of

transistors

Q

1

and

Q

6

,

resistors

R

22

and

R

23

,

and

capacitor

C

5

.

The

flip

-

flop

is

set

when

the

breaker

closes

and

opens

the

52

b

contact

,

switching

transistors

Q

1

and

Q

6

to

the

on

state

.

Capacitor

C

5

then

discharges

through

Q

6

to

turn

transistor

Q

5

off

,

setting

the

flip

-

flop

.

CONSTRUCTION

AND

OPERATION

The

SGR

-

51

is

a

solid

state

relay

consisting

of

(

1

)

a

timing

circuit

,

(

2

)

a

flip

-

flop

control

circuit

,

(

3

)

a

close

relay

circuit

,

(

4

)

a

flip

-

flop

set

circuit

,

and

(

5

)

lockout

indication

.

All

components

except

the

dropping

resistor

,

lockout

indicator

and

the

close

relay

are

mounted

on

printed

circuit

boards

.

All

components

are

identified

on

the

internal

schematic

in

Figure

3

.

o

Lockout

Indicator

Circuit

The

lockout

indicator

circuit

is

controlled

by

the

state

of

the

flip

-

flop

control

circuit

.

Consisting

of

amplifier

transistors

Q

10

and

Qll

,

the

amber

light

is

lit

when

the

flip

-

flop

is

in

the

set

state

,

and

the

relay

is

locked

out

if

the

breaker

is

open

at

this

time

.

Timing

Circuit

The

timing

circuit

is

a

uni

-

junction

relaxation

oscil

-

lator

consisting

of

uni

-

junction

transistor

Q

3

,

resistors

RIO

and

R

37

,

and

capacitor

C

2

.

After

a

preset

time

interval

controlled

by

the

adjustable

time

dial

potentiom

-

eter

R

37

,

the

relaxation

oscillator

fires

and

feeds

an

out

-

put

pulse

to

the

flip

-

flop

control

circuit

.

Theory

of

Operation

The

following

description

is

made

with

reference

to

Figure

3

.

Let

us

assume

that

the

breaker

is

open

and

nor

-

mal

voltage

is

applied

to

the

relay

.

Under

these

conditions

,

transistors

Q

2

,

Q

4

,

Q

7

and

Qll

are

on

,

and

transistor

Q

5

is

off

.

When

the

breaker

is

closed

,

the

52

b

contact

opens

and

removes

the

shorting

of

the

base

drive

to

transistor

Ql

,

turning

it

on

.

The

turn

of

Ql

shorts

the

base

drive

to

Q

2

,

turning

it

off

,

causing

diode

D

3

to

be

reverse

biased

.

This

removes

Flip

-

Flop

Control

Circuit

The

flip

-

flop

control

circuit

consists

of

tran

-

sistors

Q

4

and

Q

5

,

and

resistors

R

12

to

R

21

.

The

flip

-

flop

control

circuit

resets

when

pulsed

by

the

timing

circuit

and

thereby

activates

the

close

relay

circuit

by

turning

transistor

Q

7

off

.

All

possible

contingencies

which

may

arise

during

installation

,

operation

or

maintenance

,

and

all

details

and

variations

of

this

equipment

do

not

purport

to

be

covered

by

these

instructions

.

If

further

information

is

desired

by

purchaser

regarding

this

particular

installation

,

operation

or

maintenance

of

this

equipment

,

the

local

ABB

Power

T

&

D

Company

Inc

.

representative

should

be

contacted

.

Printed

in

U

.

S

A

.

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

668

.

IE

Fig

.

1

.

Type

SGR

-

51

Reclosing

Relay

(

Front

View

)

Fig

.

2

.

Type

SGR

-

51

Reclosing

Relay

(

Rear

View

)

2

Courtesy of NationalSwitchgear.com

I

.

L

.

41

-

668.1

E

ward

bias

diode

D

3

.

This

short

circuits

capacitor

C

2

through

Q

2

and

removes

the

charge

that

had

started

to

build

up

.

Since

the

charge

on

C

2

had

not

reached

a

level

to

fire

Q

3

,

the

control

flip

-

flop

has

not

changed

state

,

the

reclosing

circuit

remains

off

,

and

the

lockout

indicator

remains

on

.

The

breaker

will

remain

locked

out

until

manually

closed

.

the

short

-

circuit

from

capacitor

C

2

allowing

it

to

charge

through

RIO

and

potentiometer

R

37

to

the

firing

voltage

of

unijunction

transistor

Q

3

.

The

time

required

for

C

2

to

charge

and

fire

Q

3

is

controlled

by

potentiometer

R

37

set

to

a

calibrated

time

dial

.

When

Q

3

fires

,

C

2

discharges

through

Q

3

and

R

12

to

cause

a

voltage

rise

across

R

12

.

This

causes

the

voltage

on

the

emitter

of

Q

4

to

rise

above

its

base

voltage

turning

it

off

and

flip

-

flop

transistor

Q

5

on

.

When

Q

5

turns

on

,

its

collector

voltage

drops

to

a

low

level

and

removes

the

base

drive

to

Q

7

turning

it

off

.

The

low

collector

voltage

of

Q

5

also

disables

the

timing

circuit

by

forward

biasing

diode

D

4

and

providing

a

path

for

current

to

flow

through

Q

5

so

that

capacitor

C

2

cannot

charge

up

to

a

point

where

it

will

again

fire

unijunction

Q

3

.

When

the

turn

on

of

transistor

Q

5

turned

Q

7

off

,

the

potential

of

the

col

-

lector

of

Q

7

rose

and

supplied

base

drive

to

Q

8

turn

-

ing

it

on

.

The

turn

on

of

Q

8

allows

base

current

to

flow

from

Q

9

turning

it

on

.

This

switching

on

of

Q

9

energizes

the

close

relay

,

closing

the

normally

open

contact

to

the

positive

battery

supply

.

CHARACTERISTICS

Voltage

Rating

The

SGR

-

51

is

rated

for

48

or

125

volts

d

-

c

.

Un

-

less

otherwise

specified

,

the

relays

are

connected

for

125

-

volt

operation

when

shipped

.

Temperature

Range

The

SGR

-

51

is

designed

to

operate

over

a

tem

-

perature

range

from

—

20

#

C

to

+

55

*

C

with

timing

vari

-

ations

of

not

more

than

+

5

%

.

Energy

Requirements

If

a

fault

appears

on

the

protected

line

and

a

protective

relay

opens

the

breaker

,

the

52

b

con

-

tacts

make

up

providing

a

path

to

battery

positive

through

the

closed

contacts

of

the

close

relay

to

energize

and

immediately

reclose

the

breaker

.

55

milliamperes

at

rated

voltage

.

SETTINGS

Reset

Time

Setting

The

reclosing

of

the

breaker

reopens

the

52

b

contact

,

switching

transistors

Q

1

and

Q

6

on

.

Cap

-

acitor

C

5

then

discharges

through

Q

6

to

give

a

re

-

sultant

voltage

drop

across

R

19

which

causes

the

voltage

on

the

emitter

of

Q

5

to

rise

above

its

base

voltage

.

This

causes

flip

-

flop

transistor

Q

5

to

turn

off

,

setting

the

flip

-

flop

.

With

Q

5

turned

off

,

Q

7

is

supplied

with

base

drive

switching

it

on

and

Q

8

and

Q

9

off

.

With

transistor

Q

9

turned

off

,

the

close

relay

is

de

-

energized

and

its

contact

reopens

.

With

the

turn

off

of

Q

5

and

the

setting

of

the

flip

-

flop

,

Q

4

is

turned

on

,

and

the

lockout

indicator

circuit

is

ener

-

gized

by

Q

4

shorting

out

the

base

drive

to

Q

10

,

turn

-

ing

it

off

,

thereby

switching

Qll

on

to

energize

the

amber

lockout

indicator

.

The

reset

time

is

controlled

by

front

-

mounted

potentiometer

R

39

which

has

a

calibrated

time

dial

.

The

reset

time

is

variable

from

3

to

30

seconds

.

INSTALLATION

The

relays

should

be

mounted

on

switchboard

panels

or

their

equivalent

in

a

location

free

from

dirt

,

moisture

,

excessive

vibration

and

heat

.

Mount

the

relay

vertically

by

means

of

the

four

mounting

holes

on

the

flange

for

semi

-

flush

mounting

or

by

means

of

the

rear

mounting

stud

or

studs

for

pro

-

jection

mounting

.

Either

a

mounting

stud

or

the

mounting

screws

may

be

utilized

for

grounding

the

relay

.

The

electrical

connections

may

be

made

di

-

rectly

to

the

terminals

by

means

of

screws

for

steel

panel

mounting

or

to

the

terminal

studs

furnished

with

the

relay

for

thick

panel

mounting

.

The

terminal

studs

may

be

easily

removed

or

inserted

by

locking

two

nuts

on

the

stud

and

then

turning

the

proper

nuts

with

a

wrench

.

See

Fig

.

8

for

outline

and

drilling

plan

.

When

the

52

b

contact

reopened

and

switched

tran

-

sistor

Q

1

on

,

the

base

drive

to

Q

2

was

shorted

and

Q

2

turned

off

to

reverse

bias

diode

D

3

and

allow

capacitor

C

2

to

again

charge

through

R

37

and

RIO

.

Let

us

assume

that

a

protective

relay

operates

to

trip

the

breaker

before

capacitor

C

2

has

charged

to

the

firing

level

of

Q

3

.

When

the

breaker

opens

,

the

52

b

contact

closes

switching

Q

1

off

and

Q

2

on

to

for

-

For

detailed

FT

case

information

,

refer

to

I

.

L

.

41

-

076

.

3

Courtesy of NationalSwitchgear.com

I

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L

.

41

-

668

.

IE

ADJUSTMENTS

AND

MAINTENANCE

Troubleshooting

Use

the

following

procedure

to

locate

the

source

of

trouble

in

the

event

of

improper

relay

operation

.

1

.

Inspect

all

wires

and

connections

.

The

proper

adjustments

to

insure

correct

oper

-

ation

of

this

relay

have

been

made

at

the

factory

and

no

further

adjustment

should

be

required

.

2

.

Check

resistances

as

listed

in

the

electrical

parts

list

.

Acceptance

Tests

The

following

check

is

recommended

to

insure

that

the

relay

is

in

proper

working

order

.

All

checks

can

best

be

performed

by

connecting

the

SGR

-

51

as

shown

in

Figure

5

,

with

the

cal

-

operated

switch

in

the

operate

position

and

the

reset

timer

knob

ro

-

tated

to

the

3

-

second

position

.

3

.

Check

voltages

or

waveforms

as

listed

under

electrical

checkpoints

using

a

vacuum

tube

voltmeter

and

/

or

an

oscilloscope

.

Electrical

Checkpoints

Apply

rated

voltage

through

a

switch

to

relay

terminals

8

and

9

.

Terminal

9

is

positive

.

Push

PB

-

1

to

close

relay

B

.

Immediately

thereafter

,

push

PB

-

2

.

Relay

B

should

trip

open

and

remain

locked

out

.

Set

the

reset

time

dial

for

15

seconds

.

Apply

rated

voltage

to

the

relay

to

test

the

circuit

board

.

Reclose

relay

B

by

pushing

PB

-

1

.

After

3

or

more

seconds

,

push

and

hold

PB

-

2

.

Relay

B

should

trip

open

,

reclose

,

trip

open

and

remain

locked

out

.

Apply

voltage

before

each

testpoint

otfeck

,

and

interrupt

it

after

each

check

.

Take

testpoint

read

-

ings

before

and

after

the

reset

time

shown

on

the

time

dial

.

Calibration

Check

The

following

procedure

may

be

used

to

accu

-

rately

check

the

time

dial

calibration

.

Use

the

following

table

to

determine

the

correct

voltages

or

waveforms

at

the

indicated

point

.

Refer

to

Figures

6

and

7

for

circuit

board

component

layouts

.

With

the

cal

-

operate

switch

in

the

cal

position

,

apply

rated

voltage

.

Push

PB

-

1

to

start

the

timer

.

The

CR

contacts

should

close

to

stop

the

timer

after

the

time

set

on

the

reclose

timer

has

elapsed

.

RENEWAL

PARTS

Repair

work

can

be

done

most

satisfactorily

at

the

factory

.

However

,

interchangeable

parts

can

be

furnished

to

the

customers

who

are

equipped

,

for

doing

repair

work

.

When

ordering

parts

,

always

give

complete

nameplate

data

.

Routine

Maintenance

All

relays

should

be

checked

at

least

once

every

year

or

at

such

other

intervals

as

may

be

dic

-

tated

by

experience

to

be

suitable

to

the

particular

application

.

4

Courtesy of NationalSwitchgear.com

I

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L

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41

-

668.1

E

NORMAL

INDICATIONS

COMPONENTS

CHECKED

TEST

POINT

CIRCUIT

AFTER

RESET

BEFORE

RESET

Z

4

,

R

36

20

V

±

1.0

V

20

V

±

1.0

V

Reset

Board

Terminal

1

Circuit

Board

Supply

Voltage

Reset

Circuit

Bd

.

Q

2

,

Q

3

,

C

2

,

C

3

,

R

37

,

D

3

,

D

4

Slow

Voltage

Rise

to

Approx

.

15

Volts

Approx

.

1

V

Approx

.

1.4

V

Junction

of

RIO

and

C

2

Timing

Circuit

C

4

,

Q

4

,

Q

5

Approx

.

15

V

Junction

of

R

14

and

R

18

Junction

of

R

16

and

R

21

Junction

of

R

26

and

D

6

Junction

of

Q

9

and

D

7

Flip

-

Flop

Control

Circuit

Approx

.

Approx

.

15

V

1

V

Approx

.

Close

Relay

Circuit

Approx

.

Q

7

8

V

0

V

Q

8

,

Q

9

,

D

7

Approx

.

20

V

Approx

.

0

V

All

measurements

made

between

indicated

points

and

d

-

c

negative

.

5

Courtesy of NationalSwitchgear.com

I

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L

.

41

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668.1

E

O

ELECTRICAL

PARTS

LIST

RELAY

TYPE

SGR

-

51

INDICATOR

MODULE

691

B

448

G

01

RELAY

TYPE

SGR

-

51

RESET

MODULE

201

C

419

G

01

SUB

34

STYLE

RESISTOR

CAPACITOR

1

/

2

W

5

%

35

V

82.0

K

10

.

OK

4.70

K

4.70

K

8.20

K

Metal

Film

15

.

OK

10

.

OK

22

.

OK

33.0

K

49.9

K

680

Ohm

47

Ohm

10

Ohm

10

.

OK

10.0

K

33.0

K

10

.

OK

33.0

K

47

Ohm

330

Ohm

10

.

OK

184

A

763

H

73

184

A

763

H

51

184

A

763

H

43

184

A

763

H

43

629

A

531

H

54

C

01

1.5

MFD

22.0

MFD

1.5

MFD

.

047

MFD

4.7

MFD

1.5

MFD

.

1

UF

.

033

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ABB SGR-51 User manual

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