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 trained personnel who are familiar
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 pre-condition of fault-
free 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:
20
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:
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.
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.
Charged