ABB VD4 Series Instruction Manual - page 21
(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
tra ined p ers onn el who are fam iliar with the
characteristics of the particular device.
■
Operating circuit-breaker in normal condition in
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
proper conditions where necessary.
■
Remove any contamination (particularly on the insulating
materials) which has occurred during transit, storage or
installation.
■
Check the primary connections and the earthing contact 50.
1.
■
Check the charging motor on circuit-breakers with
motor-operated mechanisms by applying auxiliary voltage.
■
On breakers with manual charging mechanisms, charge the
stored energy spring by hand (see Section 6.3.1).
■
Perform a trial opening or closing operation of the circuit-
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
truck with the switchgear cubicle.
See the Operation Manual for the switchgearts.
■
Ensure that the Instruction Manual is available to the
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.
■
If the charging motor breaks down, the charging process
can be carried out or completed manually.
Circuit-breakers with manual charging mechanisms:
■
Insert charging lever 128 into the socket 55.6 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 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:
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.
■
Observe switch position indicator 55.4.
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.
■
Turn the double bit key approx. 15 clockwiese until the stop
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.
Discharged Charged
VD4 Vacuum Circuit-breaker | Commissioning/Operation 21
6 Commissioning/Operation