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.

Our advantages:
Quality Assurance
--From the very beginning, VILLE ensures quality in every step to achieve the best quality.
Experience Sharing
--With more than 30 years' experience in power industry, VILLE brings you an optimized solution.
Global Service
--Wherever you are, VILLE global network will support and provide you with value.
Quick Response
--In response to your needs without delay, VILLE  knows the value of your time.
Packaging Details: The accessories packed in plywood cases,the main body in nude.

Our Best Service For You
1. Pre sale service
A. Make technical solution
B. Send quotation, technical data sheet and drawing
C. Prepare power transmission plan, testing plan,and shipment plan
2. In sale service
A. Supervise the manufacturing schedule totally in accordance with the plan
B. Send photos to customer during every manufacturing process(hold point)
C. Inform the customer one week before testinng.
3. After sale service
A. Installation and commissioning, training the workers
B. Quick response within 12 hours any time
C. Provide 12 months gurantee period normally.

Company Profile:
Main product line: Tap changer and HV switchgear
Tap changer manufacturing with fullest vertical integration
Tap Changer Products Range On-Load Tap Changer:
* Conventional OLTC for transformer with voltage up to 765kV
*Vacuum OLTC for oil transformer with voltage up to 765kV
*Vacuum OLTC for dry transformer with voltage of 72.5kV
Off-Circuit Tap Changer
* Application for the transformer with voltage up to 765kV

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of us will create a brilliant future!