ABB V-Contact VSC Series User Manual

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1. Description
The medium voltage V-Contact VSC contactors are pieces
of apparatus suitable for operating in alternating current and
are normally used to control users requiring a high number of
hourly operations.
The basic contactors consist of:
•mouldedpolyesterresinmonobloccontainingthevacuum
interrupters
•bistableelectromagnetactuator
•multi-voltagefeeders
•auxiliarycontacts
•mechanicalstatusindicator(open/closed)
•manualemergencyopeningdevice.
Apartfromwhatisspecifiedforthefixedcontactors,the
withdrawable contactors also consist of:
•fuseholderspresetforDINorBSfuses(accordingtothe
customer’srequirements)
•automaticopeningdeviceforinterventionofevenasingle
fuse
•truck
•lockwhichpreventsclosingduringtheracking-in/out
operation.
The V-Contact VSC contactor introduces the drive with
permanentmagnets-alreadywidelyused,experimented
and appreciated in medium voltage circuit-breakers - into the
worldwide panorama of medium voltage contactors.
The experience acquired by ABB in the field of medium
voltage circuit-breakers fitted with drives with “MABS”
permanentmagnets,hasmadeitpossibletodevelopan
optimisedversionoftheactuator(BistableMACdrive)for
medium voltage contactors.
The drive is operated by means of an electronic feeder able
to cover all the power supply voltages required by the major
international Standards.
Fig. A
Magnetic circuit in the closed position.
Fig. B
Magnetic circuit with opening coil supplied.
Fig. C
Magnetic circuit in the open position.
1.1. “MAC” magnetic drive
Based on the experience gained in the field of circuit-breakers
withmagneticdrive,ABBhasimplementedthistechnologyin
the field of contactors.
The magnetic drive adapts perfectly to this type of apparatus
thanks to its precise and linear travel.
This means that a simple and direct axial transmission of the
movement to the moving contacts of the vacuum interrupter
canberealised,withbothelectricalandmechanicalbenefits.
Thedrive,whichisofbistabletype,isfittedwithanopening
and a closing coil.
The two coils - individually energised - allow the drive core to
be moved from one of the two stable positions to the other.
The drive shaft is solid with an iron core which is immersed
and held in position in a field generated by two permanent
magnets(fig.A).
Energising the coil opposite to the magnetic latching position
(fig.A)ofthecore,themagneticfield(fig.B)isgenerated,
which attracts and moves the core into the opposite position
(fig.C).
Every opening and closing operation creates a magnetic
field concordant with the one generated by the permanent
magnets,withtheadvantage,duringservice,ofkeeping
the intensity of the field itself constant as the number of
operations carried out increases.
The energy needed for operation is not supplied directly
bytheauxiliarypowersupply,butisalways“stored”inthe
capacitorwhichactsasanenergyaccumulator,andtherefore
operationalwaystakesplacewithconstantspeedsandtimes,
regardless of the divergence of the power supply voltage from
the rated value.
NEPSI.COM - Northeast Power Systems. Inc.

ABB V-Contact VSC Series Specifications

General

Brand	ABB
Model	V-Contact VSC Series
Category	Industrial Electrical
Language	English