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