Breaker Operation; Manual Closing; Electrical Closing - GE AKR-30 Series Maintenance Manual

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SECTION 5-Breaker Operation
A breaker may be equipped to operate either manually
or electrically. Both types of operation result in the same
fast-closing movement as far as the contact action is
concerned. The variation is in the way energy is stored in
the closing spring, and how it is released.
5.1

MANUAL CLOSING

Manually operated AKA breakers are constructed with
front-mounted handles.
mechanism and fully charges the closing spring. A com­
plete charge is accomplished in either cranking the han­
dle through one cycle (1 35-degree swing) or three cycles
(50-degree swing). Manually operated breakers manufac­
tured after July, 1984 can only
the handle through one cycle.
mounted on the escutcheon, is used to manually close
the breaker contacts and the TRIP button is used to open
them.
I f equipped with a closing solenoid, a manual breaker
may be closed remotely by a control switch or relay.
Before this can be done, however, the closing spring has
to be charged by hand. The closing solenoid is an op­
tional accessory and is not supplied unless specified in
the breaker order.
CONTROL
SOURCE
'I
G l
9 -
FIG. ELEMENTARY DIAGRAM FOR ELECTRICALLY OPERATED DRAWOUT BREAKER.
CONTACT POSITIONS ARE SHOWN
Handle operation resets the
be charged by cranking
The CLOSE button
cc
X
X
w
cc
WITH
5.2

ELECTRICAL CLOSING

On electrically operated breakers the closing springs are
charged by a gear motor. With the springs discharged,
voltage applied to the control circuit will energize the motor
"
through the G
through the gear reduction output crank, compresses the
closing springs until they are fully charged. As this fully
charged position is reached, mechanically operated
switches "F" and
switch deenergizing the motor and the "F" switch estab­
lishing a circuit to the
mechanical prop is positioned to prevent the discharge of
the fully charged closing spring.
With the closing spring propped fully-charged, the
breaker is ready for closing. This may be accomplished
electrically by depressing the closing switch on the breaker
(if so equipped) or by a remote closing switch. Operation of
the closing switch energizes the
energizes the closing solenoid. This removes the prop,
releasing the closing springs to close the breaker.
As the closing relay is energized, it energizes anti-pump
relay "W". If the closing switch is maintained closed, the
anti-pump relay will remain picked-up to prevent a second
closing operation on the breaker in the event it is tripped
open automatically. The closing impulse must be released
and reapplied before a second closing operation can
occur.
The closing springs on electrically operated breakers
can be manually charged. The breakers can also be man­
ually closed. Refer to Section
CC-
F-
G-
L -
M -
PB-
TC-
TC
W -
X-
BREAKER OPEN AND CLOSING SPRINGS DISCHARGED.
"
switch contacts - see Fig.
" G " reverse their shown position, the
"X" relay. At the same time, a
"X" relay, which in turn
for this procedure.
5.4
LEGEND
CLOSING SOLENOID
CUTOFF SWITCH. CLOSED
WHEN CLOSING SPRING IS
FULLY CHARGED.
CUTOFF SWITCH OPEN WHEN
CLOSING SPRING IS
FULLY CHARGE D
AUXILIARY SWITCH
CHARGING MOTOR
CLOSE PUSHBUTION ON
BREAKER ESCUTHEON.
OPTIONAL
SHUNT TRIP DEVICE
ANTI-PUMP RE LAY
CONTROL RE LAY
9.
The motor,
" G "
1 1