Non-excitation strip-type tap changer

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Product Details

This switch is suitable for three-phase and single-phase oil-immersed power transformers with rated voltages of 12, 24, or 40.5 kV, operating at frequencies of 50 or 60 Hz, and rated currents ranging from 20 to 300 A. It offers two tap‑changing configurations—central tap and neutral‑point tap—and can be directly mounted on the transformer tank cover or tank wall. Tap changes are performed under no‑excitation conditions.

Switch Model (A)	Rated Current (A)	Maximum Equipment Voltage (kV)	Voltage regulation range	Number of phases	Pressure-regulating section	Installation dimensions (mm)										Hole in the box lid (mm)
Type of tap-changer	Rated current (A)	Highest voltage for equipment（kV）	Range of voltage regulation	No. of phases	Regulating Position	H	H1	H2	L	L1	L2	L3	L4	I	Md	Holes on tank cover（mm）
WDT II 63/12-4×3	63	12	±5%	1	Middle part	180	96	75	255	147	98	65	97	24	M6	Φ43
WDT II 125/12-4×3	125		±5%			185	100	75	280	162	108	68	104	29	M8
WDT II 250/12-4×3	250		±5%			185	100	75	315	177	128	78	120	34	M10
WDT II 63/12-6×5	63		±2×2.5%			180	96	75	351	195	146	65	97	24	M6
WDT II 125/12-6×5	125		±2×2.5%			185	100	75	396	220	166	68	104	29	M8
WDT II 250/12-6×5	250		±2×2.5%			185	100	75	451	245	196	78	120	34	M10
WDT II 63/40.5-4×3	63	40.5	±5%			200	116	95	335	212	113	65	101	24	M6
WDT II 125/40.5-4×3	125		±5%			205	120	95	351	227	114	68	110	29	M8
WDT II 250/40.5-4×3	250		±5%			205	120	95	380	242	128	78	124	34	M10
WDT II 63/40.5-6×5	63		±2×2.5%			200	116	95	431	260	161	65	101	24	M6
WDT II 125/40.5-6×5	125		±2×2.5%			205	120	95	467	285	172	68	110	29	M8
WDT II 250/40.5-6×5	250		±2×2.5%			205	120	95	516	310	196	78	124	34	M10
WST II 63/12-4×3 Medium Size	63	12	±5%	3		180	96	75	396	142	132	54	88	24	M6
WST Ⅱ 63/12-4×3	63		±5%			180	96	75	396	142	132	58	97	24	M6
WST II 125/12-4×3 Medium Size	125		±5%			185	100	75	441	158	147	54	88	29	M8
WST Ⅱ 125/12-4×3	125		±5%			185	100	75	441	158	147	58	105	29	M8
WST Ⅱ 250/12-4×3Z	250		±5%			185	100	75	576	217	207	68	120	34	M10
WST Ⅱ 300/12-4×3Z	300		±5%			185	100	75	576	217	207	68	128	34	M12
WST II 63/12-6×5 Medium Size	63		±2×2.5%			180	96	75	540	190	180	54	88	24	M6
WST Ⅱ 63/12-6×5	63		±2×2.5%			180	96	75	540	190	180	58	97	24	M6
WST II 125/12-6×5 Medium Size	125		±2×2.5%			185	100	75	615	216	205	58	95	29	M8
WST Ⅱ 125/12-6×5	125		±2×2.5%			185	100	75	615	216	205	58	105	29	M8
WST Ⅱ 250/12-6×5Z	250		±2×2.5%			185	100	75	780	285	275	68	120	34	M10
WST Ⅱ 300/12-6×5Z	300		±2×2.5%			185	100	75	780	285	275	68	128	34	M12
WST Ⅳ 63/12-3×2Y-Δ	63		±3×2.5%		Y-Δ	185	100	75	610	216	200	58	101	70	M6
WST Ⅳ 125/12-3×2Y-Δ	125		±3×2.5%		Y-Δ	185	100	75	610	216	200	58	105	70	M8
WST Ⅱ 63/12-8×7	63		±3×2.5%		Middle part	180	96	75	684	238	228	68	107	24	M6
WST Ⅱ 125/12-8×7	125		±3×2.5%			185	100	75	789	274	263	68	115	29	M8
WST Ⅱ 250/12-8×7Z	250		±3×2.5%			185	100	75	984	353	343	68	120	34	M10
WST Ⅱ 63/12-9×10	63		±4×1.25%			180	96	75	828	286	276	68	107	24	M6
WST Ⅱ 63/17.5-4×3	63	17.5	±5%			180	96	75	426	157	137	58	97	24	M6
WST Ⅱ 125/17.5-4×3	125		±5%			185	100	75	471	173	152	58	105	29	M8
WST Ⅱ 250/17.5-4×3Z	250		±5%			185	100	75	636	247	227	68	120	34	M10
WST Ⅱ 63/17.5-6×5	63		±2×2.5%			180	96	75	570	205	185	58	97	24	M6
WST Ⅱ 125/17.5-6×5	125		±2×2.5%			185	100	75	645	231	210	58	105	29	M8
WST Ⅱ 250/17.5-6×5Z	250		±2×2.5%			185	100	75	840	315	295	68	120	34	M10
WST Ⅱ 63/24-4×3	63	24	±5%			195	116	95	446	167	142	58	101	24	M6
WST Ⅱ 125/24-4×3	125		±5%			200	120	95	491	183	157	58	111	29	M8
WST Ⅱ 250/24-4×3Z	250		±5%			200	120	95	666	262	237	68	124	34	M10
WST Ⅱ 63/24-6×5	63		±2×2.5%			195	116	95	590	215	190	58	101	24	M6
WST Ⅱ 125/24-6×5	125		±2×2.5%			200	120	95	665	241	215	58	111	29	M8
WST Ⅱ 250/24-6×5Z	250		±2×2.5%			200	120	95	870	330	305	68	124	34	M10
WST Ⅱ 63/40.5-4×3	63	40.5	±5%			200	116	95	546	217	167	58	101	24	M6
WST Ⅱ 125/40.5-4×3	125		±5%			205	120	95	591	233	182	58	111	29	M8
WST Ⅱ 250/40.5-4×3Z	250		±5%			205	120	95	816	337	287	68	124	34	M10
WST Ⅱ 300/40.5-4×3Z	300		±5%			205	120	95	816	337	287	68	133	34	M12
WST Ⅱ 63/40.5-6×5	63		±2×2.5%			200	116	95	690	265	215	58	101	24	M6
WST Ⅱ 125/40.5-6×5	125		±2×2.5%			205	120	95	765	291	240	58	111	29	M8
WST Ⅱ 250/40.5-6×5Z	250		±2×2.5%			205	120	95	1020	405	355	68	124	34	M10
WST Ⅱ 300/40.5-6×5Z	300		±2×2.5%			205	120	95	1020	405	355	68	133	34	M12
WST Ⅱ 63/40.5-8×7	63		±3×2.5%			200	116	95	834	313	269	68	111	24	M6
WST Ⅱ 125/40.5-8×7	125		±3×2.5%			205	120	95	939	349	298	68	120	29	M8
WST Ⅱ 250/40.5-8×7Z	250		±3×2.5%			205	120	95	1224	473	423	68	124	34	M10
WST Ⅱ 300/40.5-8×7Z	300		±3×2.5%			205	120	95	1224	473	423	68	133	34	M12

Type of tap-changer	Rated current (A)	Highest voltage for equipment (kV)	Range of voltage regulation	Number of phases	Regulating Position	Installation dimensions (mm)										Holes on tank cover (mm)
Type of tap-changer	Rated current (A)	Highest voltage for equipment (kV)	Range of voltage regulation	Number of phases	Regulating Position	H	H1	H2	L	L1	L2	L3	L4	I	Md	Holes on tank cover (mm)
WST Ⅲ 63/12-3×3	63	12	±5%	3	Neutral point	180	96	75	345	134	108	58	97	24	M6	Φ43
WST Ⅲ 125/12-3×3	125		±5%			185	100	75	454	174	143	58	105	29	M8
WST Ⅲ 250/12-3×3	250		±5%			185	100	75	454	174	143	58	110	29	M10
WST Ⅲ 63/12-5×5	63		±2×2.5%			180	96	75	489	182	156	58	97	24	M6
WST Ⅲ 125/12-5×5	125		±2×2.5%			185	100	75	628	232	201	58	105	29	M8
WST Ⅲ 250/12-5×5	250		±2×2.5%			185	100	75	628	232	201	58	110	29	M10
WST Ⅲ 63/12-7×7	63		±3×2.5%			180	96	75	633	230	204	68	107	24	M6
WST Ⅲ 125/12-7×7	125		±3×2.5%			185	100	75	802	290	259	68	115	29	M8
WST Ⅲ 250/12-7×7	250		±3×2.5%			185	100	75	802	290	259	68	120	29	M10
WST Ⅲ 63/24-3×3	63	24	±5%			200	116	95	345	134	108	65	101	24	M6
WST Ⅲ 125/24-3×3	125		±5%			205	120	95	454	174	143	67	110	29	M8
WST Ⅲ 250/24-3×3	250		±5%			205	120	95	454	174	143	67	114	29	M10
WST Ⅲ 63/24-5×5	63		±2×2.5%			200	116	95	489	182	156	65	101	24	M6
WST Ⅲ 125/24-5×5	125		±2×2.5%			205	120	95	628	232	201	67	110	29	M8
WST Ⅲ 250/24-5×5	250		±2×2.5%			205	120	95	628	232	201	67	114	29	M10
WST Ⅲ 63/24-7×7	63		±3×2.5%			200	116	95	633	230	204	76	111	24	M6
WST Ⅲ 125/24-7×7	125		±3×2.5%			205	120	95	802	290	259	78	120	29	M8
WST Ⅲ 250/24-7×7	250		±3×2.5%			205	120	95	802	290	259	78	124	29	M10
WST Ⅲ 63/12-3×3A	63	12	±5%			180	96	75	501	411	477	65	97	24	M6
WST Ⅲ 125/12-3×3A	125		±5%			185	100	75	541	441	87	67	104	29	M8
WST Ⅲ 63/12-5×5A	63		±2×2.5%			180	96	75	692	555	124	65	97	24	M6
WST Ⅲ 125/12-5×5A	125		±2×2.5%			185	100	75	772	615	144	67	104	29	M8
WST Ⅲ 63/12-7×7A	63		±3×2.5%			180	96	75	884	699	172	76	107	24	M6
WST Ⅲ 125/12-7×7A	125		±3×2.5%			185	100	75	1012	789	210	78	114	29	M8
WST Ⅲ 63/40.5-3×3A	63	40.5	±5%			200	116	95	501	411	77	65	101	24	M6
WST Ⅲ 125/40.5-3×3A	125		±5%			205	120	95	541	441	87	67	110	29	M8
WST Ⅲ 63/40.5-5×5A	63		±2×2.5%			200	116	95	692	555	124	65	101	24	M6
WST Ⅲ 125/40.5-5×5A	125		±2×2.5%			205	120	95	772	615	144	67	110	29	M8
WST Ⅲ 63/40.5-7×7A	63		±3×2.5%	3		200	116	95	884	699	172	76	111	24	M6
WST Ⅲ 125/40.5-7×7A	125		±3×2.5%	3		205	120	95	1012	789	210	78	120	29	M8

We can manufacture on-load tap changers with extended tank covers upon customer request.
Tap changers rated at 63 A and 125 A are suitable for transformer tank covers with thicknesses of 6 to 10 mm; tap changers rated at 250 A and 300 A are suitable for transformer tank covers with thicknesses of 8 to 12 mm.
We can manufacture the tap-changer with raised highness beneath the cover in accordance with the customer's requirement.
The current of 63A and 125A tap-changer is applicable to 6~1Omm transformer cover.
The current of 250A and 400A tap-changers are applicable to8~12mm transformer cover.
Models with a “Z” suffix feature a metal base (reinforced type).
The end of model with Z is metal seat (reinforced)
Add “F” after the original model number, e.g., WST63/40.5-65F.

The reverse,at the end of the original model add F,for example:WST Il 63/40.5-6 x 5F

Keywords:

Non-excitation strip-type tap changer