Mechanical Interlocks In Panel Versions With Switching-Device Trucks; Mechanical Interlocks In Panel Versions With Switch-Fuse Combination - Siemens NXAIR Operating Instructions Manual

Interlocks
7.2

Mechanical interlocks in panel versions with switching-device trucks

Action
Inserting the switching-device truck in the panel
Pulling the switching-device truck out of the panel
Racking the switching-device truck to service
position
Plugging on the low-voltage connector
Racking the switching-device truck to test position
Closing the circuit-breaker
Closing the circuit-breaker / closing the contactor
Closing the contactor
Opening the circuit-breaker / opening the contactor
Operating the feeder earthing switch
Operating the busbar earthing switch
Opening the high-voltage door
Closing the high-voltage door
1)
Not feasible with contactor panel with panel width 435 mm
7.3

Mechanical interlocks in panel versions with switch-fuse combination

Action
Operating the switch-fuse combination
Operating the feeder earthing switch
Opening the high-voltage door
30
Internal preconditions
Switching-device truck available
None
Switching-device truck inserted and interlocked
Low-voltage connector plugged
High-voltage door closed
Circuit-breaker in OPEN position /
contactor in OPEN position
Feeder earthing switch in OPEN position
Consistent coding between connector and
switching-device truck fulfilled
Circuit-breaker in OPEN position /
contactor in OPEN position
Switching-device truck in interlocked end position
(test position or service position)
Undervoltage release not electrically operated
HV HRC fuse-links not tripped
None
Switching-device truck in test position
None (see note below)
Switching-device truck in test position
Low-voltage connector plugged on
Internal preconditions
Feeder earthing switch in OPEN position and high-
voltage door closed
Switch-fuse combination in OPEN position and
high-voltage door closed
Switch-fuse combination in OPEN position
NXAIR / ≤ 40 kA
1)
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