Operating The Circuit Breaker - Siemens 8BT2 Installation And Operating Instructions Manual

6.9.

Operating the circuit breaker

Closing the circuit breaker
Preconditions •
Withdrawable truck in SERVICE or TEST position.
for the
•
Circuit-breaker in OPEN position.
operation
•
High-voltage compartment door closed.
•
Feeder earthing switch in OPEN position.
•
Low voltage connector plugged in.
Procedure
Result
80
The 3AH vacuum circuit breaker is equipped with a spring-operated/stored-energy
mechanism. The closing spring is charged automatically after every closing operation. If the
supply voltage fails, the closing spring can be charged manually. The opening spring is always
charged during the closing operation.
Fig88. Actuating opening for manual operation of the circuit breaker
ATTENTION!
If there is no auxiliary voltage, both the electrical and the mechanical interlocks are
closed. If the interlocks are eliminated, manual switching operations will be possible
despite an existing electrical interlock, and they can cause operational breakdowns.
Ensure that the intended manual switching operation has been released externally.
Insert the push rod through the actuating opening
(pos.nr. in fig88) in the door.
Operate the ON push button of the circuit breaker.
Take push rod out of actuating opening.
The position indicator changes from "0" position
to "I" position.
The operation counter is increased by 1.
The circuit-breaker is closed.
Revision 04 * INSTALLATION AND OPERATING INSTRUCTIONS 8BT2 * 881-4027.9
Opening the circuit breaker
•
Withdrawable truck in SERVICE or TEST position.
•
Circuit-breaker in CLOSED position.
•
High-voltage compartment door closed.
•
Feeder earthing switch in OPEN position.
•
Low voltage connector plugged in.
Insert the push rod through the actuating opening
(pos.nr. in fig88) in the door.
Operate the OFF push button of the circuit
breaker.
Take push rod out of actuating opening.
The position indicator changes from "I" position to
"0" position.
The circuit-breaker is open.