GE AKR Series User Manual

Power
Circui|
Breakers,
GEI-J6134
BREAKEFI.
MOUNTED
Fig.
20. Neutral
sensor
secondary
disconnect
blocks
IROUBTESHOOTING
When
malfunctioning
is suspected,
the
first
step
in
troubleshooting
is
to
examine
the circuit
breaker
and
its
power system
for abnormal
conditions
such
AS:
a)
Breaker
tripping
in
proper response
to over-
currents
or
incipient
ground faults.
Breaker
remaining
in
a
trip-free state
due
to
mechanical
interference
along
its
trip sha-ft.
Inadvertent
shunt
trip
activations.
WARNING:
DO NOT
CHANGE
TAPS
ON
THE
CURRENT
SENSOES
Oft
ADJUST
THE
PROGRAMMER
UNIT
SET
KNOBS
WHILE THE
BREAKER
15 CARRYING
CURRENT.
Once
it has been
established
that the
circuit
breaker
can beopenedand
closednormally
from
the
test
position,
attention
can be directed
to
the trip
device
proper.
Testing
is
performed
by
either of
two
methods:
1.
Conduct
high-current, single-phase
tests
on
the
breaker using a
high current-low
voltage
test
set.
NOTE: For
these single-phase
tests, spe-
cinl
cormections mustbe
employedfor
SST
breakers equippedwith
Ground Fault. Any
single
-phase
i;nfut to the
ground
differential
transformer
will
generate
cn
zmwanted
"ground
fault't
output signal
which utill trip
the
breaker.
This
can
be nullified either
by
(a)
testing
two
poles
of the breaker in
series, or
(b)
Using the
Ground Fault Defeat
Cable
as
sho?,m
in
Fig.
28. This
special
test cable energizes
all
the
pri.mary
windings
of the differential
trans
-
former
in a self-cancelling,
series-
parallel
connection so that i.ts second-
ary
output is always zero.
2.
Test
the
components
of
the
SST
system using
portable
Test
Set
Type TAK-TSI
(Fig.
21).
The
applicable
test
procedures
a-re
detailed in
Instruc-
tion
Book
GEK-64454 and are
summarized on the
next
page.
b)
c)
REAR
VIEW
-
AKR
-50
EQUIPMENT.
MOUNTED
t7

GE AKR Series Specifications

General

Number of Poles	1, 2, 3
Voltage Rating	240V AC, 480V AC, 600V AC
Frame Size	AKR
Trip Unit	Thermal-Magnetic
Standards	UL, CSA
Amperage	Varies by model (15-1200)