Putting Into Service - ABB VD4 Addendum Manual

16

V D 4 - 3 6 K V C R A D L E R E T R O F I T S O L U T I O N S E R V I C E I N S T R U C T I O N M A N U A L

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General procedures

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

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)