Siemens NXAIR Operating Instructions Manual page 385

Several electrical interlocks support safe electrical operation:
Operating option
Racking the withdrawable
circuit-breaker / circuit-breaker
truck electrically
Opening / closing the circuit-
breaker electrically for testing
purposes
Opening / closing the circuit-
breaker electrically during
service
Opening / closing the feeder
earthing switch electrically for
testing purposes
Closing the feeder
earthing switch electrically
during service
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Panels with motor operating mechanism control
Preconditions for operating option
•
Low-voltage connector plugged
on
•
High-voltage door closed
•
Feeder earthing switch in OPEN
position
•
Circuit-breaker in OPEN position
•
Access released for
motor-operated racking
•
Control door closed
•
Low-voltage connector plugged
on
•
High-voltage door closed
•
Control door closed
•
Withdrawable circuit-breaker /
circuit-breaker truck
in test position
•
Low-voltage connector plugged
on
•
High-voltage door closed
•
Control door closed
•
Withdrawable circuit-breaker /
circuit-breaker truck
in service position
•
Low-voltage connector plugged
on
•
High-voltage door closed
•
Control door closed
•
Withdrawable circuit-breaker /
circuit-breaker truck
in test position
•
Low-voltage connector plugged
on
•
High-voltage door closed
•
Control door closed
•
Withdrawable circuit-breaker /
circuit-breaker truck
in service position
NXAIR / ≤ 40 kA
Electrical interlock
During an ongoing racking
procedure, racking in opposite
direction is interlocked
electrically.
During an ongoing racking
procedure, opening / closing the
circuit-breaker is interlocked
electrically.
During an ongoing racking
procedure, opening / closing the
feeder earthing switch
is interlocked electrically.
Opening / closing the circuit-
breaker electrically for testing
purposes is not interlocked
electrically.
Opening / closing the circuit-
breaker electrically during service
is not interlocked electrically.
Opening / closing the feeder
earthing switch electrically for
testing purposes is
not interlocked electrically.
Closing the feeder earthing switch
electrically during service is
interlocked electrically.
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