16 VD4-36KV CRADLE RETROFIT SOLUTION SERVICE INSTRUCTION MANUAL
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Putting into service
General procedures
Wiring of auxiliary circuit
The auxiliary circuits of the withdrawable circuit- breaker
are fully cabled from the factory up to male connector.
For the external connections, please refer to the electric
diagram of the enclosure or of the switchgear. The female
connector in the existing panel must be replaced with the
corresponding female connector suitable for male
connector of CB & cabling of the panel to be done up to the
female connector during installation.
Before putting the circuit-breaker into service, carry out
the following operations:
• Check the tightness of the power connections on the
circuit-breaker terminals
• Establish the setting of the direct solid-state overcurrent
release (if provided)
• Check that the value of the supply voltage for the
auxiliary circuits is within 85% and 110% of the rated
voltage of the electrical devices
• Check that no foreign body, such as bit of packaging, has
got into the moving parts
• Check that air circulation at the circuit-breaker
installation site is adequate so that there is no danger of
overheating
• Carry out the checks indicated in table 2.1 (see page 17)
CAUTION
During installation of VD4 CB first time with
existing panel, before inserting VD4 CB inside
cubicle ensure that power supply to the panel is
completely switched off and there is no residual
charge present on cubicle contact by use of
proper earthing
CAUTION
All the operations regarding putting into
service must be carried out by ABB personnel or
personnel who are suitably qualified and have
in- depth knowledge of the apparatus and
installation. If the operations are prevented, do
not force the mechanical interlocks, but check
that the operation sequence is correct
The racking-in/-out operations must always be carried out
with the circuit-breaker open.
While putting into service for the first time, before
connecting secondary plug with panel socket, it is advisable
to charge the circuit- breaker operating mechanisms
manually so as not to overload the auxiliary power supply
circuit.
When the CB is inserted in the in the guide fixed on panel
side, check the following:
• Free movement of breaker from test to service position
and vice versa
• Proper engagement of secondary plug and socket
• Proper functioning of various interlocks
• Proper engagement of earthing contact
• Proper engagement of VCB tulip contact with cubicle
pin contact
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