Wsg Type C off-Circuit Tap Changer for Transformers Switch

General

Drum type off-circuit tap changer (herein referred as tap changer) is applicable to the oil immersed power

transformers with rated frequency 50Hz or 60Hz, highest voltage for equipment from 12kV to 252kV, maximum

rated through current from 250A to 2000A, as well as special transformers such as furnace transformers,

rectification transformers and traction transformers, etc. It regulates transformer voltage by changing taps with

circuit de-energized,thus changing transformer ratio,and finally stabilizing the output voltage.

According to number of phase tap changer is divided into three categories: three- phase, single plus two –
phase and single phase. 
By leads output terminal location, it is divided into three categories: A. middle leads-out; B. two ends leads-out;
C. no leads-out. (See Fig. 1, 2, 3)
There are two mounting locations inside transformer for the tap changer, one is between two adjacent windings
(Type A and Type B), and another is at one side of the transformer winding (C type).
The operation methods of tap changer include manual operation on top,manual operation at side with top
driving, manual operation at side with bottom driving,and motor driving at side(fig.4.5.6)
The feature of this type tap changer is to save transformer space with compact structure and easy connection.
The tap changer is applicable to standard type and bell type transformers.

Designation of tap changer model 

Main technical data

 Service condition

1 Service temperature range for tap changer in oil medium is -25ºC ~100ºC

2 Service environment temperature range of tap changer is -25ºC ~ + 40ºC . Relative humidity is less than 85%.

3 Perpendicular deflection between ground and tap changer after being mounting on transformer shall be less
than 2%.

4 There shall be no serious dust, explosive gas or corrosive gas at site.

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