Commissioning/Operation; Note On Safety At Work; Preparatory Activities; Operation Of The Circuit-Breaker - ABB VD4 Instruction Manual

6 Commissioning/Operation

(Figures: 3/2, 3/3, 3/10, 6/1 to 6/7)

6.1 Note on safety at work

The switchgear may only be operated by specially
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tr a i ned p er s onn el who ar e f am i l i ar wi t h t he
characteristics of the particular device.
Operating circuit-breaker in normal condition in
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accordance with relevant regulations in GB/T 11022,
IEC 60694, is a precondition of faultfree operation.

6.2 Preparatory activities

(Prior to application of primary voltage)
Check the circuit-breaker for damage and restore to the
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proper conditions where necessary.
Remove any contamination (particularly on the insulating
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materials) which has occurred during transit, storage or
installation.
Check the primary connections and the earthing contact 50.
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1.
Check the charging motor on circuit-breakers with
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motor-operated mechanisms by applying auxiliary voltage.
On breakers with manual charging mechanisms, charge the
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stored energy spring by hand (see Section 6.3.1).
Perform a trial opening or closing operation of the circuit-
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breaker using the double bit key 145 at the ON-OFF
operating shaft 54 (taking into account any required auxiliary
voltage and any relevant interlocks). Observe switch position
indicator 55.4 and charging condition indicator 55.8.
The further procedure results from the interaction of the
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truck with the switchgear cubicle.
See the Operation Manual for the switchgearts.
Ensure that the Instruction Manual is available to the
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operators at all times.

6.3 Operation of the circuit-breaker

(Figures 6/1 to 6/3 and 6/6, 6/7)
6.3.1 Charging the spring energy storage mechanism Circuit-
breakers with charging motors:
Charging takes place automatically.
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If the charging motor breaks down, the charging process
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can be carried out or completed manually.
Circuit-breakers with manual charging mechanisms:
Insert charging lever 128 into the socket 55.6 and pump
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up and down for approx. 25 strokes until the charged
condition is displayed.
When the charged condition is reached, the charging
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mechanism automatically disengages, and further strokes
of the charging lever have no effect.
Note:
Charging of the spring energy storage mechanism by hand
should only take place when the truck is in the test/disconnected
or removed position.
Key to the charging condition indications:
Discharged
As a precondition for an autoreclosing sequence, the
operating mechanism is either (re-)charged after a closing
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

Operate the local or remote electrical control unit.
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Observe switch position indicator 55.4.
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The mechanical control system facilitates manual operation
of the circuit-breaker in the switchgear cubicle even with
the door closed:
Fit double bit key 145 on ON-OFF operating shaft 54.
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Turn the double bit key approx. 15 clockwiese until the stop
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is reached to close the circuit-breaker, or anti-clockwise
to open it.
The operating cycle counter 55.5 is automatically incremented
by one complete figure with each switching cycle. On
completion of a switching operation the switch position
indicator 55.4 in the window of front cover plate 50.7.
shows the appropriate position of the circuit-breaker.
The anti-pumping relay K0 (wiring diagram in firgure 2/3)
prevents repeated ON-OFF switching operations if, for
example, the breaker is tripped by a protection relay in response
to a primary side fault while a permanent electrical closing
command is simultaneously applied. The circuit-breaker can
then only be closed after the closing command has been
interrupted.
VD4 Vacuum Circuit-breaker | Commissioning/Operation 21
Charged