ABB V-Contact VSC Series Installation And Service Instructions Manual page 20

18
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.
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).