ABB Uniswitch Operation And Maintenance Manual page 56

The switch-fuse has not operated even
though a fuse has blown.
Circuit-breaker cubicle
The cable compartment door will not
open.
The circuit-breaker will not go to the
closed position.
Instrument Transformers
Secondary measurements from the
current transformers are not possible.
ABB
Uniswitc h Operation and
Maintenanc e Manual
Check that the fuse is correctly fitted so that the trip pin
indicator is pointing upwards.
•
Check that the switch is in the earthed position.
•
Check the interlocking selector is in the 'Door open'
position.
•
Remove the key from the circuit-breaker before
opening or closing the door.
•
Ensure that the closing spring is fully charged, and
that the interlocking coil is not energised.
•
Check that the circuit-breaker key is in place and
turned to the correct operating position.
•
Check that the circuit-breakers auxiliary voltage plug
is properly locked into the socket.
•
Check that the control pin is on its position (HAD-
US).
•
Check that all shorting links on the secondary
terminals of the current transformers have been
removed.
•
Check the connections.
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UNI S14GB 05-02