Commissioning, Operation; Preparatory Activities; Operation Of The Circuit Breaker - ABB VD4 Installation And Service Instructions Manual

D I S T R I B U T I O N S O L U T I O N S
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6. Commissioning / Operation
6.1 Note on safety at work
• This switching device may only be operated by specially
trained personnel who are familiar with the characteristics of
the particular device.
• Due to safety reasons, the circuit breaker has to be treated as
"switched on" if the switching position can not clearly
determined.
In this case all high voltage connections to the breaker have to
be de-energized and zero potential on the primary side of the
breaker has to be confirmed prior to commissioning,
operation, maintenance or repair work.

6.2 Preparatory activities

(Prior to application of primary voltage)
• Check the circuit breaker for any kind of damage or other
injurious environmental influence, and restore to the proper
condition where necessary.
• Remove any contamination, particularly on insulating parts,
which has occurred during transit, storage or installation.
• Check the primary and secondary connections and the
protective conductor terminal.
• Charge the spring energy store by hand (see section 4.5).
• Perform a trial opening or closing operation of the circuit
breaker using push-button 2 or 3 (taking into account any
required supply voltage and any relevant interlocks).
• Check the charging motor on circuit breakers with motor-
operated mechanisms by applying supply voltage.
• Ensure that the Instruction Manual is available to the
operators at all times.
• Remove the lifting lugs 1.3 for hoists (Figure 8).

6.3 Operation of the circuit breaker

6.3.1 Charging the spring energy store
Circuit breakers with charging motors:
• Charging takes place automatically.
• If the charging motor breaks down, the charging process can
be carried out completed manually.
Circuit breakers with manual charging mechanisms:
• Insert charging lever 9 into recess 6 and pump up and down
for approx. 25 strokes until the charged condition is
displayed.
• When the charged condition is reached, the charging
mechanism automatically disengag es, and further strokes of
the charging lever have no effect.
Key to the charging condition indications:
Discharged Charged
As a precondition for an auto-reclosing sequence,
the operating mechanism is either (re-)charged
after a clos ing operation automatically by the
charging motor, or it requires (re-)charging by hand
if the operating mechanism is of the manual type.
6.3.2 Closing and opening
• Closing:
Press mechanical ON push-button 2, or operate
the electrical control unit.
• Opening:
Press mechanical OFF push-button 3, or operate
the electrical control unit.
The operating cycle counter 5 is automatically
incremented by one complete figure with each
switching cycle. On completion of a switching
operation the position indicator 4 in the window
of front plate 1.1 shows the appropriate position
of the circuit breaker.
• Anti-pumping relay:
The anti-pumping relay -KFN (wiring diagram)
prevents repeated ON-OFF switching opera-
tions if, for example, the breaker is tripped by a
protection relay in response to a primary side
fault while a permanent electrical closing com-
mand is simultaneously applied. The circuit
breaker can then only be closed after the clos-
ing command has been interrupted.
• Closing on failure of supply voltage:
- With standard equipment:
On failure of the control voltage, mechanical
closing by means of ON push-button 2 is
possible at any time.
- With blocking magnet -RLE1 fitted:
On failure of the control voltage, blocking
magnet -RLE1 mechanically locks the ON
haflshaft and simultaneously interrupts the
circuit shunt release ON -MBC via the cor-
responding auxiliary switch -BGL1.
• Closing with the blocking magnet de-energised
requires manipulation of the circuit breaker
operating mechanism:
- Remove front plate 1.1.
- Take care to avoid rotating parts!
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