Wsl off-Circuit Tap Changers for Transformers

General

Type WSL Off-Circuit Tap Changers are used for adjusting the voltage of oil-immersed transformers. It is
designed like a cage without oil compartment and can be vertically installed on the transformer tank cover
through top flange directly.

As per different operating modes, there’re three types of tap changer: type motor drive unit tap changer; type
ground manual drive tap changer; type hand wheel on the head tap changer. The former can be operated by
motor unit while the latter two can be only operated manually.

As per different internal structures,and regulating mode there are six types of tap changer: Type Linear off-
circuit tap changer for neutral application; Type Single-bridging off-circuit tap changer; Type Star-delta off-
circuit tap changer;

Type Double-bridging off-circuit tap changer; Type Reversing off-circuit tap changer; Type Serial-parallel off-
circuit tap changer.

As per different sizes, there are two types of tap changer: type A and type B.

There are two type of flange mounting: tank cover type and bell type.

The ground motor drive tap changer is equipped with a motor drive unit. See fig.15 for connection and “CMA9
Motor Drive Unit Instructions” specifies the operating instructions for the motor drive unit.

This instruction contains all the information for installing and operating of the three types off circuit tap changer.

Designation of tap changer model 

Main technical data

Functions and Application

Type WSL off-circuit tap changers apply to single pole or three poles oil immersed transformers with the max.
rated through current of 300A,600A,800A,1000A,1200A and highest voltage for equipment of 12 kV, 40.5kV,
72.5 kV and 126kV. And the operating position is such: model A is 5 ; mode B is 11. The rated frequency is
50Hz~60Hz.

1 Normal service condition of the tap changer

1.1 The temperature of the transformer oil shall be less than 100, more than -25

1.2 The tap changer shall be kept in the place with ambient temperature from -25~+40, and the relative
humidity shall be less then 85%.

1.3 Vertical inclination of the tap changer should not be over 2% when it is installed on the transformer.

1.4 The tap changer shall be operated in areas without any corrosive or explosive gases.

Shipment

The tap changer equipment is shipped as follows:

1 Off circuit tap changer

2 For the tap changer driven by motor drive unit, the tap changer will be delivered with Motor drive Unit type
CMA9, middle drive gear box, drive shaft

3 For ground manual drive type off-circuit tap changer, the tap changer will be delivered with hand wheel crank,
middle drive gear box and drive shaft.

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FAQ

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