Non-excited disc-type tap changer

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This switch was jointly designed in May 1994 by the Shenyang Transformer Research Institute and several manufacturers at Sanmen Tenglong Electrical Appliance Co., Ltd. It incorporates a novel structure, new materials, and advanced manufacturing processes—specifically, the lower portion of the switch housing has been reduced in height by 50–80 mm—and boasts a well‑thought‑out design, excellent tactile feedback, smooth and flexible operation, precise positioning, superior sealing performance, and low contact resistance. It represents an upgraded, next‑generation product for no‑excitation tap changers in China and passed ministerial‑level appraisal in December 1995. The switch is available in both three‑phase and single‑phase versions and is suitable for oil‑immersed power transformers operating at frequencies of 50 or 60 Hz, with maximum rated voltages of 12 kV, 40.5 kV, or 72.5 kV, and rated currents of 63 A, 125 A, 250 A, or 400 A. It can be directly mounted on the transformer tank cover or wall and enables tap changes under no‑excitation conditions.
This type of tap-changer was designed by Sanmen Tenglong Electric Appliance Co.Ltd. and the related factories with the help of Shenyang Transformer Research Institute in May 1 994. This tap-changer which is made of new structure , new material and new technology has the merits of reasonable in structure , handle freely, turning flexibly, locating exactly, good hermetically performance and small value of contact resistance ,it has become the new generation product in these days and has been certified by Ministry Department of China in December 1995. There are two sorts of products for this tap-changer, it is suitable for oilimmersed three phase or single-phase power transformer with frequency 50Hz or 60Hz, highest Voltage for equipment 12kV and 40.5kV and 72.5kV, rated current 63A, 125A, 250A and 400A. It can be fixed directly on transformer tank cover or tank wall, they must be working under non-energized condition.

WSP II₁ and WSP III₁ series non‑excited tap changers (disc type)
WSP II₁, WSP III₁, Series de-energized Tap-changer (Tray form)

WSP III₃ Series No-Excitation Tap Changer (Disc Type)
WSP III₃ Series de-energized Tap-changer (Tray form)

WDP II₂ 63/15-6 X 5QS Series No‑Excitation Tap Changer (Disc Type)
WDP ll₂ 63/15-6 X 5QS Series de-energized Tap-changer ( Tray form )

WDP ||₃ 63/□ -6x5 Series No-Excitation Tap Changer (Disc Type)
WDP ||₃ 63/□ -6x5 Series de-energized Tap-changer ( Tray form)

Fully sealed (QMF) disc-type and strip-type non‑excited tap changers
Whole sealing ( QMF ) disc、strap de-energized tap-changer

Fully sealed disc‑type and strip‑type no‑excitation tap changers are used in fully sealed oil‑immersed power transformers. In accordance with the requirements of fully sealed transformers, the sealing performance of the switch has been enhanced through a dual‑seal design, ensuring leak‑free operation and thereby improving the overall performance of the transformer. The installation method and mounting dimensions of this switch are identical to those of conventional switches of the same model.
The whole sealing disC、strap de-energized tap-changer is applicable to the whole sealing oil-immersed power transformer and ameliorate the switch’s sealing property according to the requirements of the whole sealing transformer，meanwhile, it can improve the level of the transformer on all respects by adopting the dual sealing to ensure the non-immersion of the switch. This switch’s mounting dimensions and method are the same of the general switch with same specifications.

WSP II₂ 63~125/12~40.5-4x3~6x5 disc-type no-excitation tap changer

This switch is a tap‑changing device for on‑load tap changers in combined transformers. It is suitable for three‑phase pad‑mounted transformers with a maximum rated voltage of 12 kV or 40.5 kV and a rated current of 125 A or less. The tap changer must be operated only when the transformer is de‑energized.
This instruction applies to WSP |I 2 63~125/12~40.5-4x3~6x5 type of de-energized tap-changer for pad-mounted transformer specifically used to change its step positions under no-energized condition，the switch is suitable for three-phase pad-mounded transformers with highest voltage for equipment of 12、40.5kV, rated current of 125A and below, it must be operated when the transformer is under de-energized state .

WSP II₂ 250/12-6x5SX disc-type no-excitation tap changer