GE SBC231A User manual

GEK-1
00637
B
INSTRUCTIONS
GE Multilin
215
Anderson Avenue
Markham, Ontario
L6E
1B3
Canada
http:I/www.GEindustrial.com/multilin
STATIC
BREAKER
BACK-UP
RELAY
TYPE
SBC
RELAY
SBC23IA

GEK-1
00637
Contents
Page
PRODUCT
DESCRIPTION
3
GENERAL
3
APPLICATION
3
CONFIGURATIONS
4
CALIBRATION
5
RANGES
5
HARDWARE
DESCRIPTION
6
CONSTRUCTION
6
RECEIVING, HANDLING
AND
STORAGE
6
INSTALLATION
PROCEDURE
6
Surge
Ground
6
ACCEPTANCE
TESTS
7
GENERAL
7
TEST
EQUIPMENT
7
DRAWINGS
7
EQUIPMENT
GROUNDING
7
GENERAL
RELAY
TESTS
7
Ti-PowerUp
7
T2-BFTTest
7
T3 - Shutdown
Test
8
T4
- Power
Supply Alarm Test
8
T5 - Target
Test
8
PERIODIC
TESTS
9
GENERAL
9
TEST
EQUIPMENT
9
DRAWINGS
9
EQUIPMENT GROUNDING
9
GENERAL
RELAY
TESTS
9
Ti
- Power
Up
9
T2-BFf
Test
9
T3 - Shutdown
Test
10
T4
- Power
Supply
Alarm
Test
10
T5 - Target
Test
10
SERVICING
11
SPARES
11
RENEWAL
PARTS
ii
SPECIFICATIONS
13
RATINGS
13
BURDENS
13
CONTACT
DATA
13
OVERCURRENT
UNITS
13
POWER SUPPLY
ALARM
13
ACCURACY
13
CASE
14
DIMENSIONS
14
WEIGHT
14
Lists of
Figures
and Tables
14
(COVER
PHOTO:
8919539)
-2-

GEK-1
00637
PRODUCT DESCRIPTION
GENERAL
The
Type
SBC231
relay
is
a
three-phase
static
fault
instantaneous overcurrent
relay.
This
relay
provides
high-speed
operation
at
low
multiples
of
pickup,
minimum
transient
overreach
and
fast
dropout
times.
The
SBC231
relay
contains
the
following
basic
components
and
features.
1.
A
level
detector
with
two
independently adjustable
pickup
settings
for phase
and ground
currents
with
a
reset
time
of
approximately
10
milliseconds.
2.
The
ability
to
configure
the
SBC
to
monitor
three
phase currents,
or
two
phase
currents
and
ground
current.
3.
Four
electrically
separate
(BFT) contact
output
circuits.
Two
of
these
circuits
have
an
electromechanical
series
target.
4. One
electrically
separate
(BF’T)
output
circuit
with
selectable
normally
open
or
normally
closed
contact.
5.
One
output
circuit
that
can
be used
as
a
BFT
output
or
as
a
power
supply
alarm
output.
6.
A
regulated
power
supply
with
undervoltage
cutoff.
7.
Surge
suppression
on
all
AC and
DC input
circuits.
The
power
supply
in
this
relay
is
so
designed
that
the
DC
voltage
must
exceed
60
percent
of the
nominal
voltage
rating
for the
relay
to
operate.
This
feature
prevents
false
trips
from
capacitance
discharge
or
from
the voltage
divider
effect
of the
ground
fault lamps on
the
DC
bus
in the event
that
the
DC
input
terminal
of
the
SBC
is
accidentally
grounded.
APPLI
CATION
The
SBC23I
relay
is
intended
for
applications
requiring
an
instantaneous overcurrent detector
with
fast
pickup, fast
reset,
minimum
overreach,
and
Continuous
operation
in
the
picked
up
position.
The
three
input
current
circuits
to
the
SBC231
can
be
connected
to
the
three
phase
currents
(IA,
IB,
or
IC) in
a
three-phase
system,
or
to
two
phases
and
the
residual
current
(IA,
IB,
and
310).
Typical
applications
for
the
SBC231
relay
include
local
back-up
protection
for
circuit-breaker
failure,
underrated
interrupter
applications
on
circuit
breakers
or
circuit
switches,
or
fault-
detector
supervision
on
distance
schemes.
The
external,
connections
for
the SBC231
are
shown
in
Figure
1.
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
nor
provide
for eveiy
possible
contingency
to
be
met
in
connection
with
installation,
operation
or
maintenance.
Should
further
information
he
desired
or
should
particular
problems
arise
which
are
not
covered
sufficiently
for the
purchasers
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
vaty
greatly.
-3-

GEK-100637
Figure
2 shows an application
where an
instantaneous overcurrent
relay may
he
used
to prevent
attempted interruptions
of fault
currents above
breaker rating.
For some system
conditions, heavy
close-in line faults
such
as
Fl
might
exceed the interrupting
rating
of the line breaker
(3). The
application of an
instantaneous overcurrent
relay
set near the line
brcaker
rating permits
operation of the
bus tie breaker
(BT)
to
relieve the
duty
on the line
breaker
for
these
critical
faults before operation
by
the
line
breaker. The
SBC231
is particularly well
suited
to
this
type of
application since it
has less
than
ten
percent transient
overreach and
operating times
of
approximately
one-half
cycle
(60 hertz basis)
at l.5X pick
up. (See Figure
4.) It
is
usually
possible
to coordinate this
high-set overcurrent
protection right
up to the interruption
limits
of the
line
breaker without
introducing
any delay
in the line relaying
that
would affect
other less critical
faults such
as
at
F2.
Figure
3 shows
a similar
application for protection
of a circuit
switcher
at a
transformer
tap
on
a
transmission
line. The
SBC231
overcurrent
relay
can be set to operate
just
below the interrupting
capacity of
the circuit switcher to
avoid possible
Interrupter
failure for faults
at the
high side
of the
transformer
at Fl. The SBC
would
be connected
to
block the
operation
of the
circuit switcher
until the fault
is cleared at
line
terminals
A and
B.
Applications
of
the
SBC231
as
a breaker-failure relay
would
be
accomplished
on
a per-breaker
basis.
On
this basis the current
inputs
to
a
particular
SBC
relay come from the
current
transformers
that measure
the
current in the
associated breaker.
The SBC
DC
supply is enabled
by the protective relays
associated with
the zone of protection,
and
the output of the SBC
is
connected
to a
definite
timer,
such as
a Type SAM
timing
relay.
The
timer
is
set with sufficient
delay
to
permit
interruption
of
the associated
breaker when
operated
by
the primary relays.
(See
Figure
5.)
If the
breaker
fails
to
interrupt
successfully
within this time,
the timer
will time
out
and
initiate tripping
of all
breakers
necessary
to clear
the fault. A detailed
discussion
of breaker
failure applications
for various
bus configurations
is included
in
GEK-100636.
The
SBC231
is also well suited
to applications
such
as pilot
and
distance relay
line protection
schemes
requiring
high-speed
overcurrent
detectors.
CONFIGURATIONS
Output
Studs
The
relay is
delivered with a
Normally Open Contact
at Studs 15 and 16;
it can be
changed
to a
Normally Closed
Contact
by
connecting
the Fast-On
terminal from
H15A on the
backplane
to
terminal
block
stud
15.
(See
Figure
7.)
The SBC23I is delivered
with
aPower
Supply Alarm contact
at studs 7
and
8. (See
Figure
7.)
This
Power
Supply
Alarm contact
will
close
if the
battery
voltage drops
below 19 VDC.
To configure
the relay
to
have an Output
Contact at Studs
7 and 8,
move
relay K4 from
position K4B
to
position
K4A
on
the backplane.
Input
Currents
All SBC231
models are
delivered in
the configuration
that accommodates
two
phase-current
inputs
and one ground
current
input. However,
moving
connector PM on
the backplane
to
cover
positions 3
through
8
will enable
the relay
to
monitor
three phase
currents.
(See
Figures
7
and
When connector
PL4
is
in
position
1 through
6,
and
the
external
connections
are
as
shown
in
Figure
1, the
current
at Studs
1, 2, and
3,4 is monitored
by
the phase-current
pickup and
the
current at studs
5
and
6
is monitored
by
the
ground-current
pickup.
*
The
output relays
on the SBC
have
a pickup time
of
6
- lOms.
and
a dropout time of
3 - 5
ms.
-4-

GEK-100637
When
connector
PL4
is
in
position
3
through
8,
and
the
external connections
are
as
shown
in
Figure
1A,
the
current
at
studs
1,2,
3,4,
and
5,6
is
monitored
by
the
phase-current
pickup and
the
ground-current
pickup
is
disabled.
CALIBRATION
Level
Detector
All
SBC
relays
are
tested
using
automatic
test
equipment.
There
is
no
need
for
any
calibration
when
the
relay
is
received.
However,
if
the
analog
board
is
replaced,
the
user
does
have
the
ability
to
calibrate
the
level-detector
pickup.
This
is
done
by
first
configuring
the
relay
to
monitor
both
the
phase
and
ground
inputs
(see
CONFIGURATION).
Input
an
rms
value
of
current
equal
to
that
of the
pickup
of
the
phase
or
ground
unit.
If
the
TB
ENERGIZED
LED
is
not
ON,
adjust
potentiometer
R25
(phase
unit) or R24
(ground
unit),
located
on
the
front
of
the
analog
board,
by
turning
the
screw
in
the
counter-clockwise
direction
until
the
TB
ENERGIZED
LED
is
ON
continuously.
If the
TB
ENERGIZED
LED
comes
ON
as
soon
as
the
current
is
applied,
turn
the screw
in
the
clockwise
direction
until
the
TB
ENERGIZED
LED
goes
out,
then
turn
the
screw
in
the
counter-clockwise
direction
until
the
LED
is
ON
continuously.
Reset
Timer
The
reset
time
for the
SBC
is
a
permanent
value
built
into
the hardware
of
the
relay.
If
there
is
a
need
to
change
the
reset
time,
consult
the
factory
for details.
RANGES
SBC231
1
Amp
Version
5
Amp
Version
Phase
Current
O.2A
-
1.7A,
in
O.1A
steps
1.OA
-
8.5A,
in O.5A
steps
Ground
Current
O.1A
-
O.85A,
in
O.05A
steps
O.5A
-
4.25A,
in
0.25
steps
-5-

GEK-100637
HARDWARE
DESCRIPTION
CONSTRUCTI
ON
I’he
components
of the
relay
are
mounted
on
a
cradle
assembly
that
can
easily
be
removed
from
the
relay
case,
refer
to
Figures
8
through
11.
The
cradle
is locked
in
the
case
by
latches
at
the
top
and
bottom. The
electrical
connections
between
the
case
blocks
and
the
cradle
blocks
are
completed
through removable
connection
plugs,
as
shown in
Figure
12,
to
permit
testing
the
relay
in
its case.
The
cover
is
attached
to
the
front
of
the
case
and includes
two
interlocking
arms
that
prevent
the
cover from
being
replaced
until
the
connection
plugs
have
been
inserted.
The
case
is
suitable
for
semi-flush
mounting
on
panels.
Hardware
is
available
for
all
panel
thicknesses
up
to
two
inches.
A panel
thickness
of
1/8
inch
will
be
assumed
unless
otherwise
specified
on
the
order.
The
printed-circuit
hoards
are
mounted behind
the
nameplate
and
can
be accessed
by
removing
the
four
screws
securing the
nameplate.
The
boards
are
mounted
horizontally
in guides.
Use
GE
part
nurnl)er
286A2847P1
card
puller
or
other
suitable means
to
remove the
circuit
boards.
If
you
do
not
have
a
card
puller, be
careful not
to
damage
or
bend
any
components
when
removing
the
boards.
RECEIVING,
HANDLING
AND
STORAGE
This
relay
contains
electronic
components that
could
be
damaged
by
electrostatic
discharge
currents
if those currents
flow
through
certain
terminals of
the
components.
The
main
source
of
electrostatic
discharge currents
is
the
human
body,
and
the
conditions
of low
humidity,
carpeted
floors
and
isolating
shoes are
conducive
to
the
generation
of
electrostatic
discharge
currents.
Where these conditions
exist,
care should
be exercised
when
removing
and
handling
the modules.
The
persons handling
the
module
should
make
sure
that
their
body charge
has
been
discharged,
by
touching
some surface
at
ground
potential,
before
touching any
of the
components
on
the
modules.
These
relays,
when
not
included
as
part
of
a control
panel,
will
be
shipped
in
cartons
designed
to
protect
them
against damage.
Immediately upon
receipt
of
a
relay
examine
it
for
any
damage
sustained
in
transit.
If
damage
resulting
from handling
is
evident, file
a
damage
claim
at
once
with
the
transportation
company
and
promptly notify
the
nearest General
Electric
Sales
Office.
If
the
relays
are not
to
be
installed immediately,
they
should
be
stored
in
their
original cartons,
in
a
place
that
is
free
from moisture,
dust
and
metallic
chips.
INSTALLATION
PROCEDURE
The
relay should
be
installed
in
a clean,
dry
location, free
from
dust and
excessive
vibration.
It
should
be
mounted
on
a
vertical surface.
The
outline
and
panel-drilling
dimensions are
shown
in
Figure
13.
Surge
Ground
The
case
stud
should
be
permanently connected
to
ground
by a
conductor
not
less
than
AWG
No.
12
copper
wire
or
equivalent.
This
connection
is
made
to
ground
the
relay
case
and the
surge
suppression networks
in
the
relay.
The
surge-ground lead
should
be
as short
as possibLe,
preferably
10
inches
or
less,
to
provide maximum
protection
from surges.
Figure
10
shows
the
rear
view
of
an
M2
case,
illustrating the
position
of
the case-grounding
stud.
-6-

GEK-1
00637
ACCEPTANCE
TESTS
CAUTION
Power
Down
the
relay
by
removing
the
test
plugs
before
removing or
inserting
modules.
Failure
to
do
so
can
permanently
damage
the
relay.
GENERAL
This
section
is
a
guide
for
testing
the
relay.
It
is
not
necessary
that
the
tests
be
performed
for
incoming
inspection.
The
relay has
been tested
at
the
factory
with
automated
test
equipment.
TEST
EQUIPMENT
1.
Single
source
of
current
at
the
rated
frequency.
2. AC
ammeter.
3.
Continuity
tester
or
Ohm meter.
4.
One
VDC
supply.
The
specific
requirements
of
the
equipment
are
given
in
the
text
of
this
section,
and
in
the
associated
circuit diagrams.
DRAWINGS
Figure
1,
located
in
the
PRODUCT
DESCRIPTION
section,
should be used
for
reference
during
testing.
EQUIPMENT
GROUNDING
All
equipment
used
in testing the
SBC23I
relay
should
be
connected
to a
common grounding
point
to
provide
noise
immunity. This
includes
the
current
source,
as
well
as
the
SBC231
itself.
The
ground connection
on the
SBC231
is
terminal
#21
(case).
GENERAL
RELAY
TESTS
All
tests
are
performed
assuming
the
relay
is configured
for
an
NO
Power
Supply
Alarm
contact
at
Studs
7
and
8
and
an
NO
contact
at
studs
15
and
16.
Ti
-
POWER
UP
I.
Connect
the relay
as
shown
in
Figure
14.
The
AC
input
is
not required
for
this
test;
only
the
DC
power
supply
voltage
is
required.
Apply
the
rated
DC.
2.
Only
the
Green,
ENERGIZED,
LED
should
be
on.
T2
-BFI’TEST
1.
Connect
the
relay
as
shown
in
Figure
15.
2.
Set
the
phase
and
ground
pickup
to
its
minimum
setting.
3.
Conduct
the
test
according
to
the
steps
in
Table
I.
-7-

GEK-100637
TABLE I
Current
Current
Studs
Contacts Phase
or
Ground!
TB
Energized
95% of
phase
PU
1,2
open
off
95%
of
phase
PU
3,4
open
off
95%
of
ground
PU
5,6
open
off
105%
of
phase PU
1,2
closed
on
105%
of
phase
PU
3,4
closed
on
105%
of
ground
PU
5,6
closed
on
T3
- SHUTDOWN
TEST
1.
Connect
the relay
as
shown
in Figure
15.
2.
Conduct
the
test
accordin
to
the last
line
of
Table
I.
3.
While the
input
current
is
still
being
applied,
decrease
the
input
DC
to
60%
of
the
Rated
DC
voltage.
4.
The
only
relay
lights that
should
remain
on
are
the
DC
Voltage
Low
light
and
the
Energized
light.
All
contacts
should
go
to
their
unenergized
state.
T4
-
POWER
SUPPLY
ALARM
TEST
1.
Connect
the
relay
as
shown
in
Figure
16.
2.
Conduct
the
test
according
to
the last
line
of
Table
I.
3.
While the
input
current
is
still
being applied,
lower
the
DC
voltage
to
19
VDC.
4.
All
output
contacts
should go
to
their unenergized state
and
the Power
Supply
Alarm
contacts should
close.
T5
- TARGET
TEST
1.
Connect
the relay
as
shown
in
Figure 17.
2. Set
the
phase
pickup to
1
A.
Input
2
A
into studs
1,2.
3.
Input
200
mA
through
contacts
11,12
and
see
that
the
I3FT1
target
has
tripped.
4.
Input
200
mA
through
contacts
13,14
and
see
that
the
BFT2
target
has
tripped.
-8-

GEK-1
00637
PERIODIC
TESTS
CAUTION
Power
Down
the
relay
by
removing
the
test
plugs
before
removing
or inserting
modules.
Failure
to
do
so
can
permanently
damage
the
relay.
GENERAL
This
section
is
a guide for
testing the
relay.
It
is
not
necessary
that
the
tests
be
performed
for
incoming
inspection.
The
relay
has
been
tested
at
the factory
with
automated
test
equipment.
TEST
EQUIPMENT
1.
Single
source
of
current
at
the
rated
frequency.
2.
AC
ammeter.
3.
Continuity
tester
or
Ohm
meter.
4. One
VDC
supply.
The
specific
requirements
of
the
eq4pment aregiven
in
the
text
of
this
section,
and
in
the
associated
circuit diagrams
in
the
ACCEPTANCE
TESTS
section.
DRAWINGS
The
External Connections
Diagram
(SBC231),
Figure
1
located
in
the PRODUCT
DESCRIPTION
section, should
be
used
for
reference
during
testing.
EQUIPMENT
GROUNDING
All
equipment
used
in
testing
the
SBC23I
relay
should be
connected
to a
common grounding
point
to
provide
noise
immunity.
This
includes
the
current
source,
as
well
as
the
SBC231 itself.
The
ground connection
on
the
SBC23
1
is
terminal
#10.
GENERAL
RELAY
TESTS
Ti
-
POWER
UP
1.
Move
the
rated
DC
voltage
switch
to
the
input
battery
voltage.
2.
Connect
the
relay
as
shown
in
Figure
14
The AC
input
is
not
required
for
this test;
only
the
DC
power-supply voltage
is
required.
Apply
the
DC.
3.
Only
the
Green,
ENERGIZED,
LED
should
be
on.
T2-BVI’TEST
1.
Connect
the
relay
as
shown
in
Figure
15.
2.
Apply
current
5
percent
below
the
pickup
value
to
each
of
the
three current
inputs.
3.
Notice
that
the
contacts
are open
and
no
lights
are
on.
4.
Increase
current
to 5
percent
above
the
pickup
value.
Notice
that
all
of
the
contacts
have
closed
and
the
Phase/Ground
and
TB
Energized
lights
are
on.
-9-

GEK-100637
T3
- SHUTDOWN
TEST
1. Connect
the
relay
as
shown
in
Figure
15.
2. Conduct
the test
according
to
item
4 of
the
BFT
TEST.
3.
While
the input
current
is
still
being
applied,
decrease
the
input DC
to
60%
of
the
Rated
DC
voltage.
4.
The
only
relay
lights
that
should
remain
on are the
DC
Voltage
Low
light
and
the
Energized
light.
All
contacts
should
go to
their
unenergized
state.
T4
- POWER
SUPPLY
ALARM
TEST
1.
Connect the relay
as
shown
in
Figure
16.
2.
Conduct
the
test
according
to
item
4
of the
BFT
TEST.
3.
While
the input
current
is being
applied,
lower
the
DC
voltage
to
19
VDC.
4.
All
output
contacts
should
go
to
their
unenergized state
and
the
Power
Supply
Alarm
contacts
should
close.
T5
- TARGET
TEST
1.
Connect
the relay
as
shown
in
Figure
17.
2.
Input
current
5 percent
above the
Phase
pickup setting.
3.
Input
200
mA through
contacts
11,12
and
see
that
the BFTI
target
has
tripped.
4.
Input
200
mA
through
contacts
13,14
and
see
that
the
BFT2
target
has
tripped.
-10-