9
1ZSE 5492-115 en, Rev. 5
fm_00069
1 Introduction
1. Introduction
The on-tank concept of on-load tap-changer, realized by ABB in the UZ range, is unique.
The design offers advantages in installation and maintenance. The whole device is delivered
installed in a tank that is simply mounted onto the transformer tank together with the motor-
drive mechanism.
In the event of an on-load tap-changer being delivered without a tank, the transformer
manufacturer will supply the tank. Appendix A includes a welding and mounting instruction.
It is easy to access all parts of the on-load tap-changer for maintenance and repair. After
draining the oil, you simply unbolt and open the front cover to access any part you may
need to inspect or replace.
Lifting eye
Connection to oil conservator
On-load tap-changer tank
Oil valve
Pressure relay
Terminals for
conductors
Attachment ange to
transformer tank
Cover for access to conductors,
UZFonly
Fig. 1. General arrangement of on-load tap-changer.
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