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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.

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This position indicator type HMC-3C is applied with motor drive units of CAM7 and CMA9 (hereinafter referred as MDU) of on-load tap changer, and it can display the actual position of tap changer, there are three buttons "1-N", "stop" and "N-1" on the front panel, beside them is an indication lamp of "Remote Control". The input signal for position indication is decimal code and output BCD code.HMC-3C adopts LED digital tube to display the positions and it characterizes as high stability andreliability, the plastic housing of HMC-3C make it light-weighted, small-sized, easy and safe to operate.
SHM-K is equipped with high-resolution touch screen. CPU is made from ARM9 chip, clocked 400M, FLASH 256M, RAM 64M, with a very fast speed and huge memory space. Through the optical fiber, it is communicates with the SHMLC on both ways. It can work under five modes:① manually independent regulator;② automatic independent regulator;③ manual regulator in parallel host mode;④ automatic regulator in parallel host mode;⑤ parallel slave regulator mode.
Type SHGV vacuum on-load tap changer is of combined structure, applicable to SF6 gas insulation regulating transformers, comprising two major parts: diverter switch and tap selector. Tap changer is laid in the transformer gas tank by means of its head flange and the diverter switch is in a separate gas compartment. It can be used at neutral point of star-connection for three-phase; singe-phase for any selectable winding connection; a combination of three units of single-phase for any selectable winding connection and any position voltage regulating.
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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