Closing The Circuit-Breaker Electrically - Siemens NXAIR Operating Instructions Manual

10.10 Closing the circuit-breaker electrically

Preconditions
•
Withdrawable circuit-breaker / circuit-breaker truck in service position or in test position
•
Circuit-breaker in OPEN position
•
Spring state indicator for the closing spring shows CHARGED
•
High-voltage door closed
•
Auxiliary voltage for the panel connected
•
Remote or local control
Procedure
Close the circuit-breaker via central or local electrical control element.
After closing, the closing spring is immediately automatically charged by the motor and the
spring state indicator changes to CHARGED.
Change of the spring state indicator during closing operation:
Charged
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NOTICE
Conflicting operation
Operating the circuit-breaker electrically is possible locally or from a central
control. The requirement of setting the panel to either local or remote control
prevents operating the panel locally and centrally at the same time.
Depending on the intended operating mode, set the panel to either local or
remote control (for example by switching the local-remote switch).
INFORMATION
If an undervoltage release is fitted, it must be connected to the auxiliary voltage for
the switching operation, as otherwise closing is not possible.
INFORMATION
Unexpected switching noise and vibration
Operating the circuit-breaker discharges and/or charges the spring energy store
abruptly. This causes a short loud noise and low vibration.
Expect switching noise and low vibration from inside the circuit-breaker.
INFORMATION
The opening spring is charged during the closing operation.
Discharged
NXAIR / ≤ 40 kA
Operating the circuit-breaker panel
Charged
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