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GEI-86134, Power Circuit Breokers
Fig.
21,
SST/ECS
test
set, cat. no.
TAK-TSI
USING THE
SST TEST
sET
The
TAK-TSI Test
Set
is a portable
instrument
designed
for
field-checking the time-current char-
acteristics and pickup calibration
of
the
SST's
various
trip
elements.
It
can
verify
the
ability
of
the
Flux-Shift
Trip
Device
to
trip
the breaker
andr
in addition,
includes means
for
continuity
checking
the phase sensors.
WARNING:
BEFORE CONNECTING
THE
TEST SET TO THE BREAKER TRIP DE-
VICE
SYSTEM, ENSURE
THAT
THE
CIRCUIT BREAKER
15
COMPLETELY
DISCONNECTED
FROM ITS
POWER
SOURCE.
ON DRAWOUT EQUIPMENT,
RACK THE BREAKER TO
ITS
DISCON-
NECTED
POSITION. VERIFY I:HAT
THE
BREAKER
IS
TRIPPED.
Either of
two
test
modes
may be employed:
rrArt
-
Programmer Unit
Only.
These
tests
are
conduct@
unit
disconnected
from
the
breaker.
During test, the unit
can
remain
attached
to the breaker
or
may be completely
re-
moved
from
it.
18
CAUTION: NEVER
DISENGAGE
THE
T//,RNESS CONNECTOR
FROM THE PRO-
GRAMMER UNIT
ON
A
BREAKER THAT
/S
ENERGIZED
AND
CARRYING
LOAD
CURRENT. THIS
WILL
OPEN-CIRCUIT
THE
CURRENT
S.ANSORS,
ALLOWING
DANGEROUS
AND
DAMAGING VOLT-
AGES TO DEVELOP.
Test
scope:
1.
Verify
the time-current characteristics
and
pickup
calibration of the various
trip
elements.
2. Verify
operation
of
the SST
target
indicators
on
programmer units so
equipped.
rrBrt
-
Complete
Trip
Device System.
For
these
tests,
mounted
on
the
breaker and
connected
to its wirins
harness.
Test
scope:
1.
A11
"A"
tests previously described, plus pro-
vision
for
optionally switching the programmer's
output
to
activate
the Flux-Shift
Trip
Device
and
veri-fy
its
operation
by
physicaliy tripping
the
breaker.
2.
Check phase
sensor continuity.
In the
event
that
any
component
of
the SST
system
does not perform within the
limits
prescribed in
test instructions GEK-64454.
it
should be
replaced.
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