Earthing / De- Earthing The Feeder Electrically - Siemens NXAIR Operating Instructions Manual

27.15 Earthing / de- earthing the feeder electrically

Preconditions
•
Low-voltage connector plugged on
•
High-voltage door closed
•
Feeder to be earthed is isolated
•
Control door closed
•
Remote or local control
•
Withdrawable circuit-breaker / circuit-breaker truck in test position
Procedure
Set the feeder earthing switch to OPEN or CLOSED either locally or from the central control.
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Panels with motor operating mechanism control
NOTICE
Maloperation
Earthing / de-earthing the feeder electrically is only possible when both the high-
voltage door and the control door are closed.
Close the control door before earthing / de-earthing the feeder electrically.
NOTICE
Conflicting operation
Earthing / de-earthing the feeder 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
Earthing the feeder is only permissible if the withdrawable circuit-breaker /
circuit-breaker truck is in test position.
When earthing the feeder in this way, the position of the circuit-breaker is not
significant: The feeder may be earthed while the circuit-breaker is in OPEN
position or CLOSED position.
NXAIR / ≤ 40 kA
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