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Design principles
On-load tap-changer (OLTC)
VUC vacuum diverter switch tap-changer family comes in a
range of models with ratings suitable for the most frequent
transformer applications. The VUC types of tap-changers are
usually mounted inside the transformer tank, suspended from
the transformer cover.
VUC tap-changers is built on the same platform as the
conventional UC tap-changers and shares the well proven
selectors, diverter switch housings and drive train.
This design consists of two separate sections: the diverter
switch, which has its own housing separate from the rest of
the transformer, and the tap selector. The tap selector, which
Bevel gear
Transformer tank
Shaft
Motor-drive mechanism
Fig. 1. Main parts, on-load tap-changers type VUC.
6 Technical guide VUC | 1ZSC000562-AAX en, Rev. 1
is mounted beneath the diverter switch housing, consists
of the fine tap selector and usually also of a change-over
selector. Power to operate the tap-changer is supplied from
the motor drive mechanism, which is mounted on the outside
of the transformer. The power is transmitted by means of
shafts and bevel gears.
The VUC diverter switches, with arc quenching in vacuum
interrupters, contaminates it's insulating liquid slightly due
to current commutation sparks and heat dissipation from
the transition resistors therefore it's insulating liquid is kept
separated from the oil in the transformer to not influence the
oil analysis of the main transformer tank.
Shaft
Oil conservator
Transformer cover
Diverter switch
On-load tap-changer
Tap selector
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