28
Subject Procedure Positive check
of inspection
Under- Give the rated auxiliary supply to the The circuit-breaker closes
Voltage under-voltage release and carry out correctly
release the circuit-breaker closing operation The signals are correct
Disconnect the power supply to the The circuit-breaker opens
release
Shunt Close the circuit breaker manually The signal changes over
opening Put the changeover switch on LOCAL The circuit breaker opens
release normally
Locally control the electric opening
of the circuit-breaker using the
special pushbutton (alternatively
opening can be set and controlled
remotely).
Local- Open the circuit breaker manually The circuit breaker closes
remote Put the changeover switch on LOCAL normally
selector SW
Locally control the electric closing
of the circuit-breaker using the
special pushbutton (alternatively
closing can be set and controlled
remotely).
Key lock Open the circuit breaker Neither manual nor electric
Turn the key and remove it. Attempt closing takes place
the circuit breaker closing operation
Insert the key again and turn it 90 deg. Both electric and manual
Carry out the closing operation closing take place correctly;
in this position the key
cannot be removed
Changeover Put the changeover switch on REMOTE The operations and signals
switch for Close the operating mechanism are normal
Local/Remote enclosure door. Carry out a few
electrical opening and closing operations using
control the special remote controls.
Open the operating mechanism Remote closing is not
enclosure door. Try to carry out the possible
remote closing operation.
Auxiliary Insert the auxiliary contacts into Signals occur correctly
contacts in suitable signalling circuits. Carry out
the operating a few closing and opening operations
mechanism
Cable glands Check lightness of the fairleads used The fairleads used must be
and of the free ones. correctly locked; the free
fairleads must be covered
with the relative plate and
blocked
5.2 Space heaters
A space heater is provided in the control cabinet. The heater switch must always be ON when the breaker is
in service to prevent condensation.
PART B Installation, Operation & Maintenance
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