ABB V-Contact VSC Series, Installation And Service Instructions Manual

18

Heating

Refer to technical catalogue 1VCP000165 for

the rated capacity of the contactors, bearing in

mind that apparatus heating is affected by the

following variables:

• layout of the enclosures in the switchgear de-

signed by the customer;

• degree of protection (ventilation slats);

• current density of the power supply busbars

(busbar duct - branches);

• ambient temperature.

For any needs, please contact ABB Service.

Reference Standards

The enclosures and contactors comply with the

following Standards:

– CEI 17/6 (1993) (where applicable)

– ICE 62271-200 (2003) (where applicable)

– CEI EN 60694 (1997) (where applicable)

– IEC 60694 (2002) (where applicable)

– IEC 60470 (2000) (where applicable)

Withdrawable VSC/P  contactors

The contactors are used for rated voltages from

7.2 to 12 kV, rated normal currents up to 400 A

and fault levels up to 1000 MVA (with suitable

protection fuses in series with the contactor).

The VSC/P contactor is made up of:

– a three-pole contactor with SCO or DCO func-

tion

– mechanical signalling of open/closed

– two pairs of auxiliary contacts signalling open/

closed

– multi-voltage feeder:

• type 1: from 24 to 60 Vdc

• type 2: from 100 to 135 Vdc/Vac- 50-60 Hz

• type 3: from 220 to 250 Vdc/Vac- 50-60 Hz

– a truck on which the supporting structure of

the contactor is fixed, consisting of two sup-

ports, closed at the front by the protection with

characteristics nameplate.

In the top part of the protection there are strik-

ers (30a) and (30b) for actuating the enclo-

sure contacts to signal protection connected/

isolated.

The pin (34) for locking contactor racking-in

with the earthing switch closed on the enclo-

sure, comes out on the right side of the truck

(28).

5.6.2. Withdrawable contactors and enclo-

sures

The withdrawable contactors are used in the

UniGear ZS1 type switchgear and in the

PowerCube enclosures.

Appropriately fixed together in the configura-

tions defined by the customer, the enclosures

build up medium voltage switchgear consisting

of various units.

Rules for designing the switchgear

Arc proof

The ABB enclosures are supplied with a rein-

forced door, suitable for making arc proof

switchgear.

• The reinforced enclosure alone can-

not guarantee arc proofing of the

switchgear designed by the custom-

er. To guarantee this, some repre-

sentative configurations, selected

by the customer, must be subjected

to the tests according to the pre-

scriptions indicated in the IEC

62271-200 Standards.

• For UniGear ZS1 type switchgear, all

the door knurls must be tightened

to guarantee arc proofing.

Degree of protection

Limited to the front part, the ABB enclosures

guarantee the following degree of protection:

• IP30 on the external housing;

• IP20 inside the switchgear with the door open.

Special versions up to IP41.

The reinforced enclosure alone sup-

plied by ABB cannot guarantee the de-

gree of protection of the switchgear

designed by the customer. It must un-

dergo the tests according to the pre-

scription indicated in the IEC62271-

200 Standards.

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