Siemens NXAIR - Page 385

Panels with motor operating mechanism control
110-0134.9 / 14 NXAIR / ≤ 40 kA 385
Several electrical interlocks support safe electrical operation:
Operating option
Preconditions for operating option
Electrical interlock
Racking the withdrawable
circuit-breaker / circuit-breaker
truck electrically
• 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
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
• Low-voltage connector plugged
on
• High-voltage door closed
• Control door closed
• Withdrawable circuit-breaker /
circuit-breaker truck
in test position
Opening / closing the circuit-
breaker electrically for testing
purposes is not interlocked
electrically.
Opening / closing the circuit-
breaker electrically during
service
• Low-voltage connector plugged
on
• High-voltage door closed
• Control door closed
• Withdrawable circuit-breaker /
circuit-breaker truck
in service position
Opening / closing the circuit-
breaker electrically during service
is not interlocked electrically.
Opening / closing the feeder
earthing switch electrically for
testing purposes
• Low-voltage connector plugged
on
• High-voltage door closed
• Control door closed
• Withdrawable circuit-breaker /
circuit-breaker truck
in test position
Opening / closing the feeder
earthing switch electrically for
testing purposes is
not interlocked electrically.
Closing the feeder
earthing switch electrically
during service
• Low-voltage connector plugged
on
• High-voltage door closed
• Control door closed
• Withdrawable circuit-breaker /
circuit-breaker truck
in service position
Closing the feeder earthing switch
electrically during service is
interlocked electrically.