Non-excited disc-type tap changer

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无励磁分接开关

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WSPlI, WSPIIl, Series de-energized Tap-changer (Tray form)

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 received ministerial‑level appraisal in December 1995. Available in both three‑phase and single‑phase versions, it 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. The switch can be directly mounted on the transformer tank cover or wall and enables tap changes under no‑excitation conditions.

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated Current (A) Rated current(A)	Maximum Equipment Voltage (kV) Highest voltage for equipment (kV)	Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	Installation dimensions (mm) Install dimension (mm)					Hole diameter on the box lid (ΦD, mm) Holes on tank cover ΦD(mm)
Switch model Type of tap-changer	Rated Current (A) Rated current(A)		Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	H	H1	ΦD2	ΦD1	Md
WDPⅠ,25/24-10×5	25	24	±2×2.5%	1	Wire end Line terminal	159	90	88	145	M5	Φ43
WDPⅡ,63/40.5-4×3	63	40.5	±5%		Central region Middle part	205	130	88	170	M6
WDPⅡ,63/40.5-6×5	63		±2×2.5%			205	130	88	170	M6
WDPⅡ,63/40.5-8×7	63		±3×2%			205	130	88	170	M6
WDPⅡ,63/40.5-10×9	63		±4×1.25%			205	130	88	170	M6
WDPⅡ,125/40.5-4×3	125		±5%			205	130	88	170	M8
WDPⅡ,125/40.5-6×5	125		±2×2.5%			205	130	88	170	M8
WDPⅡ,125/40.5-8×7	125		±3×2%			205	130	88	170	M8
WDPⅡ,125/40.5-10×9	125		±4×1.25%			205	130	88	170	M8
WDPⅡ,125/72.5-10×9	125	72.5	±4×1.25%			300	230	88	218	M8
WDPⅡ,63/12-4×3	63	12, 24	±5%			150	73	77	107	M6
WDPⅡ,63/24-4×3	63		±5%			170	100	77	120	M6
WDPⅡ,63/12-6×5	63		±2×2.5%			150	73	77	107	M6
WDPⅡ,63/24-6×5	63		±2×2.5%		170	100	77	120	M6
WDPⅤ,63/12-4×3	63		±5%	double-bridge crossing connection	135	60	77	135	M6
WSPⅡ,63/12-4×3	63		±5%	3	Central region Middle part	150	75	88	170	M6
WSPⅡ,63/24-4×3	63		±5%			150	75	88	170	M6
WSPⅡ,125/12-4×3	125		±5%			150	75	88	175	M8
WSPⅡ,125/24-4×3	125		±5%			150	75	88	175	M8
WSPⅡ,250/12-4×3	250		±5%			160	85	108	220	M8
WSPⅡ,250/24-4×3	250		±5%			160	85	108	220	M8
WSPⅡ,63/12-6×5	63		±2×2.5%			150	75	88	197	M6
WSPⅡ,63/24-6×5	63		±2×2.5%			150	75	88	197	M6
WSPⅡ,125/12-6×5	125		±2×2.5%			150	75	88	200	M8
WSPⅡ,125/24-6×5	125		±2×2.5%			150	75	88	200	M8
WSPⅡ,250/12-6×5	250		±2×2.5%			160	85	108	280	M8
WSPⅡ,250/24-6×5	250	±2×2.5%	160			85	108	280	M8

Switch model Type of tap-changer	Rated Current (A) Rated current(A)	Maximum Equipment Voltage (kV) Highest voltage for equipment (kV)	Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	Installation dimensions (mm) Install dimension (mm)					Hole diameter on the box lid (ΦD, mm) Holes on tank cover ΦD(mm)
Switch model Type of tap-changer	Rated Current (A) Rated current(A)		Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	H	H1	ΦD2	ΦD1	Md
WSP Ⅱ,63/12-8×7	63	12, 24	±3×2.5%	3	Central region Middle par	185	80	150	335	M6	Φ60
WSP Ⅱ,125/12-8×7	125		±3×2.5%			185	80	150	335	M8
WSP Ⅱ,250/12-8×7	250		±3×2.5%			185	80	150	340	M8
WSP Ⅳ,63/12-3×2(Y-△ )	63		/(Y-△ )		(Y-△ )	150	75	88	170	M6	Φ43
WSP Ⅳ,125/12-3×2(Y-△ )	125		/(Y-△ )		(Y-△ )	150	75	88	175	M8
WSP Ⅱ,63/40.5-4×3	63	40.5	±5%		Central region Middle part	200	120	108	223	M6
WSP Ⅱ,125/40.5-4×3	125		±5%			200	120	108	230	M8
WSP Ⅱ,250/40.5-4×3	250		±5%			200	120	108	250	M8
WSP Ⅱ,63/40.5-6×5	63		±2×2.5%			200	120	108	285	M6
WSP Ⅱ,125/40.5-6×5	125		±2×2.5%			200	120	108	295	M8
WSP Ⅱ,250/40.5-6×5	250		±2×2.5%			200	120	108	320	M8
WSP Ⅲ,63/12-3×3	63	12	±5%		Neutral point Neutral point	145	75	77	110	M6
WSP Ⅲ,125/12-3×3	125		±5%			145	75	77	125	M8
WSP Ⅲ,250/12-3×3	250		±5%			165	90	108	168	M8
WSP Ⅲ,400/12-3×3	400		±5%			165	90	108	168	M8
WSP Ⅲ,63/12-5×5	63		±2×2.5%			156	78	88	163	M6
WSP Ⅲ,125/12-5×5	125		±2×2.5%			156	78	88	170	M8
WSP Ⅲ,250/12-5×5	250		±2×2.5%			160	86	108	220	M8
WSP Ⅲ,63/40.5-3×3	63	40.5	±5%			205	126	88	140	M6
WSP Ⅲ,125/40.5-3×3	125		±5%			205	126	88	150	M8
WSP Ⅲ,63/40.5-5×5	63		±2×2.5%			205	130	88	195	M6
WSP Ⅲ,125/40.5-5×5	125		±2×2.5%			205	130	88	200	M8
WSP Ⅵ,63/24-5×2	63	24			series-parallel connection exchange	180	105	108	250	M6
WSP Ⅵ,125/24-5×2	125	24		180	series-parallel connection exchange	105	108	250	M8

Tap changers rated at 63 A are suitable for transformer tank covers with thicknesses of 5–8 mm (except for single-phase units); those rated at 125 A are suitable for covers 5–10 mm thick; and the 250 A and 400 A models are designed for covers 8–14 mm thick. The moving contact assemblies are available in clip‑type and roller‑type configurations—clip‑type units carry no designation, while roller‑type units must be specified at the time of order. We can also manufacture tap changers with extended mounting height to accommodate tank covers of greater thickness, as required by the customer. Please indicate any additional special requirements when placing your order.
The curent of 63A tap-changer is applicable to 5~8mm transformer cover (except single phase);The current of 125A tap-changer is applicable to 5~10mm transformer cover.The current of 250A and 400A tap-changers are applicable to 8~14mm transformer cover.The moving contact's structure is clamping type or roling type. The clamping type has no code number. If you need the rolling type, pleaseillustrate in ordering.
We can manufacture the tap-changer with raised highness beneath the cover in accordance with the customer's requirement.
If you have other specific requirements please detail it in ordering.

WSPIIl ₃ Series No-Load Tap Changer (Disc Type) WSPIIl ₃ Series de-energized Tap-changer (Tray form)

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated current (A)	Equipment highest voltage (kV)	Range of voltage regulation	Number of phases N0.	Regulating position	Installation dimension (mm)					Holes on tank cover ΦD(mm)
Switch model Type of tap-changer	Rated current (A)	Equipment highest voltage (kV)	Range of voltage regulation	Number of phases N0.	Regulating position	H	H1	ΦD2	ΦD1	Md	Holes on tank cover ΦD(mm)
WSP III 3 63/12-3x3	63	12	± 5%	3	Middle part	155	75	50	110	M6	Φ21
WSP III 3 125/12-3x3	125	12	± 5%	3	Middle part	155	75	50	125	M8	Φ21

WDPll ₂ 63/15-6x5QS Series No‑Excitation Tap Changer (Disc Type) WDPll ₂ 63/15-6x 5QS Series de-energized Tap-changer (Tray form)

WDPlI.63/-65 Series de-energized Tap-changer (Tray form) WDP ll, 63/-6x 5 Series de-energized Tap-changer (Tray form)

WDPIl,63/15-6x5QS2 Series off-circuit Tap Changer (Tray form)

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated current (A) Rated current(A)	Maximum Equipment Voltage (kV) Highest voltage for equipment (kV)	Voltage regulation range Range of voltage regulation	Number of phases N0.of phases	Pressure-regulating section Regulating position	Installation dimensions (mm) Install dimension (mm)		Hole diameter on the box lid: ΦD (mm) Holes on tank cover ΦD(mm)
Switch model Type of tap-changer	Rated current (A) Rated current(A)		Voltage regulation range Range of voltage regulation	Number of phases N0.of phases	Pressure-regulating section Regulating position	H	H1
WDP II363/20-6×5	63	24	±2×2.5%	1	Central region Middle part	82	75	Φ34
WDP II363/30-6×5	63	36	±2×2.5%	1	Central region Middle part	102	95	Φ34

Whole sealing (QMF)tray-form, linearity 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 double‑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.

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated Current (A) Rated current(A)	Maximum Equipment Voltage (kV) Highest voltage for equipment (kV)	Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	Installation dimensions (mm) Install dimension (mm)					Hatch opening (mm) Holes on tank cover (mm)
						H	H1	ΦD2	ΦD1	Md
WSP Ⅱ,63/12-4×3QMF	63	12	±5%	3	Central region Middle part	153	75	90	170	M6	Φ43
WSP Ⅱ,125/12-4×3QMF	125								175	M8
WSP Ⅲ,63/12-3×3QMF	63				Neutral point Neutral point			77	110	M6
WSP Ⅲ,125/12-3×3QMF	125								125	M8
WSP Ⅲ,63/12-5×5QMF	63		±2×2.5%			156	78	90	163	M6
WSP Ⅲ,125/12-5×5QMF	125								170	M8

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated Current (A) Rated current (A)	Maximum Equipment Voltage (kV) Highest voltage for equipment (kV)	Voltage regulation range Range of voltage regulation	Number of phases Number of phases	Pressure-regulating section Regulating position	Installation dimensions (mm) Install dimension (mm)										Hatch opening (mm) Holes on tank cover (mm)
						H	H1	H2	L	L1	L2	L3	L4	I	Md
WST Ⅱ 63/12-4×3QMF	63	12	±5%	3	Central region Middle part	170	96	75	396	142	132	58	97	24	M6	Φ43
WST Ⅱ 125/12-4×3QMF	125					175	100		441	158	147		105	29	M8
WST Ⅲ 63/12-5×5QMF	63		±2×2.5%		Neutral point Neutral point	170	96		489	182	156		97	24	M6
WST Ⅲ 125/12-5×5QMF	125					175	100		628	232	201		105	29	M8
WST Ⅲ 250/12-5×5QMF	250												110		M10

WSPII, tray-form tap changer for combined transformer used
This switch is a tap‑changing device for on‑load tap changers used 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.

Type of tap-changer and installation size chart

Switch model Type of tap-changer	Rated Current (A) Rated current(A)	Maximum Equipment Voltage (kV) Highest voltage for equipment	Pressure-regulating section Regulating position	Voltage regulation range Range of voltage regulation	H	H1	H2	Md	ΦD
WSP II 2 63/12-4 × 3	63	12	Central region Middle part	±5%	292	117	70	M6	120
WSP II 2 63/12-6 × 5				±2 × 2.5%				M6
WSP II 2 125/12-4 × 3	125			±5%				M8
WSP II 2 125/12-6 × 5				±2 × 2.5%				M8
WSP II 2 63/40.5-4 × 3	63	40.5		±5%	407	133	120	M6	120
WSP II 2 63/40.5-6 × 5				±2 × 2.5%				M6
WSP II 2 125/40.5-4 × 3	125			±5%				M8
WSP II 2 125/40.5-6 × 5				±2 × 2.5%				M8

WSPl2163~125/12~40.5-4x3~65 tray-type de-energized tap-changer WSP ll 21 63~125/12~40.5-4x 3~6 x 5 Tray-form de-energized tap-changer

Switch model Type of tap-changer	H	H1	H2	Md	Hatch opening Holes on tank cover
WSP II2163/12-4×3	312	114	70	M6	Φ43
WSP II21125/12-4×3	312	114	70	M8
WSP II2163/12-6×5	312	114	70	M6
WSP II21125/12-6×5	312	114	70	M8
WSP II2163/40.5-4×3	427	129	120	M6
WSP II21125/40.5-4×3	427	129	120	M8
WSP II2163/40.5-6×5	427	129	120	M6
WSP II21125/40.5-6×5	427	129	120	M8

WSPl,63~125/12~40.5-87 disc-type de-energized tap-changer WSP ll , 63~125/12~40.5-8x 7 Tray-form de-energized tap-changer

Switch model Type of tap-changer	H	H1	H2	Md	ϕ D
WSP II 2 63/12-8×7S	308	114	70	M6	145
WSP II 2 125/12-8×7S	308	114	70	M8
WSP II 2 63/40.5-8×7S	423	129	120	M6
WSP II 2 125/40.5-8×7S	423	129	120	M8