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Interlocks
7
Interlocks
7.1
Mechanical interlocks for single-busbar system
Action
Inserting the withdrawable part in the panel
Pulling the withdrawable part out of the panel
Racking the withdrawable part to service position
Plugging on the low-voltage connector
Racking the withdrawable part to test position
Closing the circuit-breaker
Closing the circuit-breaker
Opening the circuit-breaker
Operating the feeder earthing switch
Operating the busbar earthing switch
Opening the high-voltage door
Closing the high-voltage door
20
Internal preconditions
Withdrawable part on the service truck
None
Withdrawable part inserted and interlocked
Low-voltage connector plugged on
High-voltage door closed
Circuit-breaker in OPEN position
Feeder earthing switch in OPEN position
Consistent coding between connector and
withdrawable part fulfilled
Circuit-breaker in OPEN position
Withdrawable part in interlocked end position
(test position or service position)
Undervoltage release not electrically operated
None
Withdrawable part in test position
None (see note given below)
Withdrawable part in test position
Low-voltage connector plugged on
NXAIR M
139-2021.9 / 07
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