1ZSE 5492-124 en, Rev. 6 | Maintenance guide UCG 9
1. Introduction
1.1 General
The UC range of on-load tap-changers manufactured by ABB
has been developed over many years to provide maximum
reliability. The simple and rugged design gives a service
life equal to the service life of the transformer. Minimum
maintenance is required for trouble-free operation. The only
parts requiring maintenance are contacts that might need
replacement during the service life, the insulating oil and the
motor-drive mechanism.
The design allows excellent access to all parts, making
inspection and maintenance quick and simple.
The on-load tap-changer, type UCG, is housed in the
transformer tank. The motor-drive mechanism is attached
to the transformer tank and connected to the on-load tap-
changer by means of drive-shafts and a bevel gear, see Fig. 1.
Fig. 1. On-load tap-changer and motor-drive mechanism.
Hood and screws
Shielding-ring (when impulse
withstand voltage to earth
exceeds 380 kV). (Not on tap
selector size C)
Bevel gear
Pressure relay
Bevel gear
Vertical drive-shaft and
protection tube
Hand crank
Shielding-rings (when
impulse withstand
voltage to earth
exceeds 380 kV)
Insulating shaft
Diverter switch housing
containing the diverter
switch
Conductors
Motor-drive
mechanism
On-load tap-changer
Horizontal drive-shaft and
protection tube
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