Siemens NXAirS Manual page 34

NXAirS Withdrawable Metal-enclosed Switchgear, Rated Voltage Up to 12kV
Operation of NXAirS
34
Earthing Switch
Faults Causes
Removable part is in working
Sliding block for feeder
position.
earthing switch cannot
open.
Operating handle for removable
part is still inserted in.
One interlock on control panel is
locked up.
Sliding block is locked up by the
padlock.
Removable part is in working
Feeder earthing switch
position.
cannot be closed
(electric failure).
Operating handle for removable
part is still inserted in the hole.
One interlock on control panel is
locked up.
Without control voltage.
Without control voltage.
Feeder earthing switch
cannot be opened (electric
Operating handle for removable
failure).
part is still inserted in the hole.
One interlock on control panel is
locked up.
Circuit Breaker
Faults Causes
Operating handle for removable
Circuit breaker cannot be
part is still inserted in.
closed.
Removable part is in middle
position.
Spring is without energy.
Undervoltage trip doesn't act.
The door for HV compartment is
not closed.
Spring without energy. Without control voltage.
Measures
Return the removable part to
test position.
Take out the operating handle.
Unlock this interlock according
to normal operation procedures.
Open the padlock.
Return the removable part to
test position.
Take out the operating handle
for removable part.
Unlock this interlock according
to normal operation procedures.
Restore the control voltage.
Restore the control voltage.
Take out the operating handle
for removable part.
Unlock this interlock according
to normal operation procedures.
Measures
Take out the operating handle
for removable part.
Drive the removable part
to working position or test
position.
Wait for 10 seconds (motor
energy storage) or manual
energy storage.
Force the undervoltage trip to
action.
Close the door for HV
compartment.
Switch on control voltage or
manual energy storage.