Single-phase no-excitation drum-type tap changer

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Product Details

This switch consists of a switch body and an operating mechanism, employing a crankshaft principle, compression springs, and annular moving contacts. It features a rational structure, simple operation, automatic positioning, a firm tactile feel, and excellent contact performance. It is suitable for oil-immersed transformers with a frequency of 50 Hz or 60 Hz, a rated voltage of 220 kV (with a maximum equipment voltage of 252 kV) or lower, and a rated current ranging from 200 A to 2,500 A. The switching section is mounted on the transformer tank or the lower tank flange, while the operating mechanism is fixed to the tank cover, enabling tap changing under no‑excitation conditions.

WDGll,(126kV) single-phase drum-type tap-changer (200~2500A) WDG ll,SERIES (126kV) off-circuit drum-formed tap-changer

Type of tap-changer and installation size chart

Switch type Type of tap-changer	Rated current (A)	Highest voltage (kV)	Range of voltage regulation	Installation dimension (mm)			Holes on tank cover (mm)
				H	H1	H2
WDG II₃ 200~630/40.5~126-4×3 WDG II₃ 200~630/40.5~126-6×5	200, 400.630	40.5, 126	±5%	900	380	104	Φ85
			±2×2.5%
WDG II₃ 800~1000/40.5~126-4×3 WDG II₃ 800~1000/40.5~126-6×5	800, 1000	40.5, 126	±5%	1100	380	87	Φ85
			±2×2.5%
WDG II₃ 1250/40.5~126-4×3 WDG II₃ 1250/40.5~126-6×5	1250	40.5, 126	±5%	1100	430	110	Φ85
			±2×2.5%
WDG II₃ 1600/40.5~126-4×3 WDG II₃ 1600/40.5~126-6×5	1600	40.5, 126	±5%	1100	430	60	Φ85
			±2×2.5%
WDG II₃ 2000/40.5~126-4×3 WDG II₃ 2000/40.5~126-6×5	2000	40.5, 126	±5%	1200	530	75	Φ85
			±2×2.5%
WDG II₃ 200~630/40.5~126-4×3A WDG II₃ 200~630/40.5~126-6×5A	200, 400.630	40.5, 126	±5%	680	380	144	Φ85
			±2×2.5%
WDG II₃ 800~1000/40.5~126-4×3A WDG II₃ 800~1000/40.5~126-6×5A	800, 1000	40.5, 126	±5%	680	380	127	Φ85
			±2×2.5%
WDG II₃ 1250/40.5~126-4×3A WDG II₃ 1250/40.5~126-6×5A	1250	40.5, 126	±5%	680	430	110	Φ85
			±2×2.5%
WDG II₃ 1600/40.5~126-4×3A WDG II₃ 1600/40.5~126-6×5A	1600	40.5, 126	±5%	680	430	60	Φ85
			±2×2.5%
WDG II₂ 2000/40.5~126-4×3A WDG II₂ 2000/40.5~126-6×5A	2000	40.5, 126	±5%	900	530	135	Φ85
			±2×2.5%

Models with an “A” suffix feature a wooden clamp mounting method; floor‑standing models have no suffix.
A stands for clamp-form fixing mode,Floor-form fixing mode is without suffix.

Type of tap-changer and installation size chart

Switch model Type of tap changer	Rated Current (A) Rated current	Maximum Voltage (kV) Highest voltage	Voltage regulation range Range of voltage regulation	Installation dimensions (mm) Install dimension (mm)						Hatch Opening (mm) Holes on tank cover (mm)
Switch model Type of tap changer	Rated Current (A) Rated current	Maximum Voltage (kV) Highest voltage	Voltage regulation range Range of voltage regulation	H	H1	H2	H3	H4
WDG II3200~630/40.5~126-8 × 7	200, 400, 630	40.5, 126	± 3 × 2.5%	1000	280	50	—	—	φ85
WDG II3800~1000/40.5~126-8 × 7	800, 1000			1000	280	50			φ85
WDG II31250/40.5~126-8 × 7	1250			1100	400	78			φ85
WDG II31600/40.5~126-8 × 7	1600			1100	400	46			φ85
WDG II32000/40.5~126-8 × 7	2000			1200	500	65			φ85
WDG II3200~630/40.5~126-8 × 7A	200, 400, 630			680	280	105	50		φ85
WDG II3800/40.5~126-8 × 7A WDG II31000/40.5~126-8 × 7A	800, 1000			680	280	94	50		φ85
WDG II31250/40.5~126-8 × 7A	1250			800	400	123	30	60	φ85
WDG II31600/40.5~126-8 × 7A	1600			800	400	91			φ85
WDG II32000/40.5~126-8 × 7A	2000			900	500	110			φ85

Models with an “A” suffix feature a wooden clamp mounting method; floor‑standing models have no suffix.
A stands for clamp-form fixing mode .Floor-form fixing mode is without suffix.

WDGlI2 (252 kV) single-phase drum-type tap changer (200–2500 A) WDG II, Series de-energized drum-formed tap-changer

Type of tap-changer and installation size chart

Switch model Type of tap changer	Maximum Voltage (kV) Highest voltage	Rated Current (A) Rated current	Voltage regulation range Range of voltage regulation	H1	H2	H
WDG II _200-630/252-6×5A	252	200-630	±2×2.5%	105	280	680
WDG II _2800-1000/252-6×5A		800, 1000		94	280	680
WDG II _1250/252-6×5A		1250		123	400	800
WDG II _1600/252-6×5A		1600		91	400	800
WDG II _2000/252-6×5A		2000		110	500	900
WDG II _2500/252-6×5A		2500		123	560	1000

Main performance parameters: 1. Lightning impulse withstand voltage between fixed contacts and between moving and fixed contacts: 285 kV;
2. Power-frequency withstand voltage between fixed contacts and between moving and fixed contacts: 90 kV/1 min;
3. Partial discharge quantity < 10 pC.
Main technical data:1.The lightning impulse withstand voltage between the fixed contact and the rolling contact is 285kV;
2.The power frequency withstand voltage between the fixed contact and the rolling contact is 90kV/1min;
3.Partial discharge level:<10 PC .
1. Models with the letter “A” indicate wood‑clamp mounting; floor‑standing models are denoted without any additional symbol.
1. A stands for clamp-form fixing mode, floor-form fixing mode is without suffix.

WDGll2 (252 kV) single-phase drum-type tap-changer (200–1600 A) WDG ll2 Series de-energized drum-formed tap-changer

Type of tap-changer and installation size chart

Switch model Type of tap changer	Maximum Voltage (kV) Highest voltage	Rated Current (A) Rated current	Voltage regulation range Range of voltage regulation	H1	H2	H
WDG II 2200-630/252-8×7A	252	200-630	±3×2.5%	108	280	680
WDG II 2800-1000/252-8×7A		800, 1000		137	350	800
WDG II 21250/252-8×7A		1250		121	380	800
WDG II 21600/252-8×7A		1600		140	450	900

Main performance parameters: 1. Lightning impulse withstand voltage between fixed contacts and between moving and fixed contacts: 350 kV;
2. Power-frequency withstand voltage between stationary contacts and between moving and stationary contacts: 110 kV/1 min;
3. Partial discharge level < 10 pC.
Main technical data:1.The lightning impulse withstand voltage between the fixed contact and the rolling contact is 350kV;
2.The power frequency withstand voltage between the fixed contact and the rolling contact is 110kV/1min;
3.Partial discharge level:<10 PC .
1. Models with the letter “A” indicate wood‑clamp mounting; floor‑standing models are denoted without any additional symbol.
1.A stands for clamp-form fixing mode,floor-form fixing mode is without suffix.

WDG|3(126kV) single-phase drum-type tap changer (200~2000A) WDG I, Series (126kV) de-energized drum-formed tap-changer

Type of tap-changer and installation size chart

Switch model Type of tap changer	Rated Current (A) Rated current	Maximum Voltage (kV) Highest voltage	Voltage regulation range Range of voltage regulation	Installation dimensions (mm) Install dimension (mm)									Hatch Opening (mm) Holes on tank cover (mm)
				H	H1	H2	H3	H4	Φd1	Φd2	Φd3
WDG I3200~630/40.5~126-5×5	200, 400, 630	40.5, 126	±2×2.5%	1000	280	50	—	—	230	250	270	φ85
WDG I3800~1000/40.5~126-5×5	800, 1000				280	50
WDG I31250/40.5~126-5×5	1250			1100	400	78			280	300	320	φ85
WDG I31600/40.5~126-5×5	1600			1100	400	46
WDG I32000/40.5~126-5×5	2000			1200	500	65
WDG I3200~630/40.5~126-5×5A	200, 400, 630			680	280	105	50		230	250	270	φ85
WDG I3800/40.5~126-5×5A WDG I31000/40.5~126-5×5A	800, 1000				280	94
WDG I31250/40.5~126-5×5A	1250			800	400	123	30	60	280	300	320	φ85
WDG I31600/40.5~126-5×5A	1600			800	400	91
WDG I32000/40.5~126-5×5A	2000			900	500	110

1. Models with an “A” suffix feature a wooden clamp mounting method; floor‑standing models have no suffix.
1. A stands for clamp-form fixing mode .Floor-form fixing mode is without suffix.

Keywords:

Single-phase no-excitation drum-type tap changer