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As the only moving component inside transformer tank, on-load tap changer needs to be highly reliable both electrically & mechanically. By different means, tap changers can be divided into different categories. By operation mode, it can be on-load or de-energized (off-circuit) tap changer; by arcing extinguishing medium, it can be conventional (arcing in oil) or vacuum (arcing in vacuum interrupter) tap changer; by structure, it can be selector switch or diverter switch tap changer; by mounting method, it can be in-tank or on-tank (bolt-on) tap changer; by transition impedance, it can be resistive or reactive tap changer; and by insulation medium, it can be liquid immersed, air insulated or gas insulated tap changer.


In Huaming, we provide one-stop voltage regulation solutions for all your needs. 


Type WDG is a drum type de-energized tap changer. It is often designed by the combination of one single-phase and one two-phase tap changers. These two tap changers are to be installed in the clearance between the three winding in one transformer, which is a dramatic saving of transformer space and oil.
Type WSL De-Energized Tap Changer (herein referred as tap changer) is of in-tank structure and without separate oilcompartment. It is mounted to transformer tank by a tap changer head ange.By the operation method, tap changer can be divided into motor driving at man position, and manual drive mechanismoperating at man position as well as hand wheel manual operation on the top.
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