Circuit Breaker; Earthing Switch Operation - GE SecoGear User Manual

Move the truck from disconnect / test position to service position
a. Make sure the front and back door of the switchgear are
closed. Make sure the earthing switch is in the open position,
the circuit breaker compartment is clear and without any
unexpected object.
b. Insert the secondary plug of the truck into the socket on the
topside of the switchgear truck compartment and put into the
lock position. (See figure 4/5 & 4/6)
c. Make sure the circuit breaker is in the open position.
d. Insert the racking crank of the truck into the rectangular
cranking hole of the screw mechanism of the truck through
the operation hole under the door of the circuit breaker
compartment. (See figure 4/7).
e. Turn the crank clockwise (approximately 20 turns) until it can't
be moved any more, listen for a strong cranking sound when
the breaker changes into the operating position.
f. The position indicator on the door of the low voltage
compartment shows the breaker is in service position.
g. Take off the racking crank. The racking operation is now
complete.
Figure 4/5: Take off secondary
plug from truck
Figure 4/6: Put the secondary
plug into switchgear socket
Figure 4/7: Rack in the breaker
to work position
SecoGear 24kV-27kV Air Insulation Switchgear
Warning
The truck is not allowed to be placed in any intermediate
position between disconnect/test position and operating
position.
Move the Circuit Breaker from service position to test
position
a. Make sure the circuit breaker is in open position.
b. Perform the operating steps for moving the Circuit Breaker
into operation position in reverse order.
Move the Circuit Breaker from switchgear
compartment to transfer truck.
Perform the operating steps for moving the Circuit Breaker truck
from transfer truck into the switchgear in reverse order.

Circuit breaker

For operating instructions refer to the Circuit Breaker instruction
manual.

Earthing switch operation

The earthing switch has a rapid close-open mechanism, which
is independent to the rotation speed of the earth switch drive
shaft.
The closing brake function can be quickly applied through
the rapid close-brake mechanism. The earthing switch, circuit
breaker truck and rear cover behind the panel have a closedown
device to prevent incorrect operation.
The earthing switch can be operated only when the truck is in
disconnect / test position and the rear cover of the switchgear is
in the closed position.
The operating hole of the earthing switch located in the lower
position of the right side in front of the panel. (See figure 4/8).
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