Panels with motor operating mechanism control
208 NXAIR M 139-2021.9 / 07
Several electrical interlocks support safe electrical operation:
Preconditions for operating option
Racking the withdrawable
circuit-breaker to test position
electrically
Low-voltage connector plugged
on
High-voltage door closed
Feeder earthing switch in OPEN
position
Circuit-breaker in OPEN position
Access is 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
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
in service position
Opening / closing the circuit-
breaker electrically during
service for testing purposes 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
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
in service position
Closing the feeder earthing switch
electrically during service is
interlocked electrically.
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