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
Previous
Issue
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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.
41
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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
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41
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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
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
UF
.
047
UF
187
A
508
H
09
862
A
177
H
04
187
A
508
H
09
188
A
669
H
16
184
A
661
H
12
187
A
508
H
18
3526
A
65
H
10
863
A
166
H
07
188
A
669
H
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