SecoGear 24kV-27kV Air Insulation Switchgear
22
Diagnosis and trouble shooting for malfunction during operations
Malfunction
Reason
Resolution
The circuit breaker can not be racked into service
position from test position
1. The handles on the withdrawable frame is not
in position.
2. The circuit breaker is closed
3. The earthing switch is closed
4. The circuit breaker is electrically interlocked
(electromagnetic Y0 locked)
5. Shutter is not completely open
1. Adjust the frame and handles
2. Open the circuit breaker
3. Open the earthing switch
4. Unlock /Check electromagnetic Y0
5. Check shutter drive mechanism
The circuit breaker can not be racked out to test
position from service position
1. The circuit breaker is closed
2. The circuit breaker is electrically interlocked
(electromagnetic Y0 locked)
1. Open the circuit breaker
2. Unlock /Check electromagnetic Y0
Can not lower the shutter on the earthing switch
operating hole
1. The circuit breaker is not in test / disconnected
position
2. The earth switch is electrically interlocked
1. Rack the circuit breaker out to test position or
disconnected position
2. Unlock / Check electromagnet
Operating hole shutter can not rise back after
the earthing switch is opened
Drive shaft of earthing switch has not reached
intended position
Turn the crank anticlockwise to the limit where
the mechanical OPEN indication stays exactly
below the operating hole
The cable compartment door can not be closed /
opened
The earthing switch is not completely
opened
Open the earthing switch
The circuit breaker can not be closed
1. No auxiliary power supply
2. The control plug is not inserted
3. The circuit breaker is not engaged in test /
service position
4. The closing spring has not been charged
5. The electrical interlocking in position
6. Closing release not working
1. Turn on auxiliary power supply
2. Insert and lock control plug
3. Fully engage the circuit breaker to test /service
position
4. Charge the closing spring
5. Check power supply for interlocking
6. Check power supply for closing release
The circuit breaker can not be opened
1. No auxiliary power supply
2. Opening release not working
1. Turn on auxiliary power supply
2. Check power supply for opening release
Maintenance item and cycle
Maintenance of the switchgear should be carried out by
trained personnel, who are familiar with the switchgear
characteristics, in accordance to the manufacturer's
instructions and IEC standards.
Safety measure: Routine inspection is to ensure smooth
operation of the switchgear. It does not require power
shutdown, but requires care to prevent incorrect
operations.
It is recommended any major repairs (if required) shall be
assisted by the manufacturer or a qualified representative.
The purpose for routine inspection is to find issues in advance so
they can be resolved immediately.
Routine Inspection
