GEK-7
21 01, Low
V olt
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ge
Switchgeor
BREAKER
OPERATION
CTOSING
MANUALLY
OPERATED
AK
BREAKERS
Manually operated AK
breakers are closed by
rotating
the
closing
handle counter-clockwise
through approximately
120 degrees, and then
clockwise
back
to
fhe normal handle
position.
Four
such complete movements
of the handle
are
required
to
close the breaker.
During the
four
counter-clock-
wise movements and the first three clockwise
moveroents
of the handle,
the springs are charged. After
approximately
70 degrees travel of the fourth clockwise
handle movement,
the spring charged
mechanism is driven over center
and the
breaker
closes.
A charge indicator, numbered
1
to
4, viewed
through the breaker
front escutcheon, moves
with each
complete handle
movement and indicates the
number of
complete handle
movements that have been
performed.
CLOSING MANUALLY OPERATED AKR
BREAKERS
Manually
operated
AKR
breakers
are
equipped
with
a
handle and a
push
button
marked CLOSE on
the
front of
the escutcheon. The closing spring must be charged
first.
A complete
charge
is accomplished by
either
rotating the
handle counter-clockwise
through
about 135 degrees and
then
clockwise back to the normal
position
or by using
three similar cycles of about 50 degrees
each. The charge
indicator should read CHARGED at
this
point.
Now the
breaker can be closed by
pushing
the CLOSE button.
CLOSING ELECTRICALLY OPERATED AK
OR
AKR BREAKERS
Electrically operated
breakers may be operated by ac
control
power,
or
dc
(normally
station battery) control
power.
They may
be
controlled by
a
pushbutton
switch on the
breaker escutcheon, by a breaker control switch, or by a
relay
contact. The control switch
or
relays may
be
located
in the equipment which houses
the breaker, or may be in
some remote
location.
MANUAL TRIPPING_AK
OR
AKR BREAKERS
A mechanically
operated trip
button,
mouuted
on the
breaker escutcheon, operates
the trip shaft
to open the
breaker.
ELECTRIC TRIPPING_AK
OR AKR BREAKERS
A shunt
trip
device is
an accessory used for electrical
tripping. A normally open auxiliary switch
"a" contact
opens the control circuit after the
breaker opens.
NOTE:
FOR FURTHER IiVSIRUCflONS RE-
FER
TO
TITE /NSTRUCTION BOOK FUR-
NISHED
WITH
THE BREAKER.
TESTING AND
INSPECTION
Although
the equipment and devices have been tested at
the factory, they must be tested and inspected
in
the field
before being
placed
in service.
This will insure that the
equipment has been
properly
iostalled, and that all connec-
tions
are correct.
All bolted connections and
control wire connections
should be
checked for tightness.
WARNING:
PRIMARY ESUIPMENT
MUST
BE COMPLETELY DE-ENERGIZED
WHILE
?ESTS ON
CONTROL CIRCUITS, ETC, ARE
BEING
CONDUCTED. BE
SURE
THAT
ALL
,4RE,4S
OF
FEEDBACK FROM
SECONDARY
CIRCUITS AS
WELL AS OUTS/DE
SOURCES
ARE
DISCONNECTED.
Directions
for testing
relays,
instruments and
meters are
given
in the instruction book
furnished for
each device.
The settings
of
protective
relays must be
coordinated
with
other relays
on the
system and therefore these
relay
settings
must be made by the
purchaser.
General
instructions on
setting the relays
are
given
in
the Relay Instruction
Book.
NOTE:
CLL BREAKERS
ARE SHIPPED WITH
THE TRIP DEVICES
SET AT THE MINIMUM
LEVEL. BEFORE ENERGIZING THE ESUIP-
MENT, CHECK TO SEE THAT ALL TRIP
DEVICES
ARE SET
AT
THE PROPER
VALUES,
The extent
of the tests on
the
equipment
as a whole will
depend on the type and function
of the equipment. Tests
which
should be
performed,
however,
include circuit breaker
operation, and
switchgear metering,
phasing,
and
grounding
checks.
High
potential
tests
to check
the
integrity
of the insula-
tion are
not necessary
if the
installation instructions are
carefully followed. If local codes demand
this test or the
purchaser
wishes
to make high
potential
tests, the voltage
should not
exceed 75% of the
ANSI
factory
test voltage.
For the
power
circuit
the
ANSI factory
test
voltage is
two
times switchgear rating
plus
1000 volts.
CAUTION:
POTENTIAL IRAiVSFORMERS,
CONTROL
POWER TRAJYSF.ORMERS, AND
ANY OTHER DEVICES
CONNECTED TO
PRIMARY
CIRCUITS
MUST BE DISCON-
NECTED DURING HIGH POTENTIAL TESTS.
22
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