Off Circuit Transformer Tap Changer

30A, 36Kv, 5 tapping positions, Alumminium pull up operating controll knob, silver plated contacts. Very solid quality !!!

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Product Introduction

This kind of aluminum hand-wheel central point linear tap-changer applies to the single-phase, three phase and combination oil-immersed transformer electrical power with frequency of 50HZ,60HZ,rated voltage of 10KV,35KV,rated current of 30A～500A. The voltage-regulating modes are: central part, terminal point neutral point etc. which can be directly fixed on the tank cover of the transformer, exchange under the off-circuit condition.

As customers of public distribution grid operators expect to be provided with a relatively constant voltage within a narrow bandwidth regulated by standards, drawing hand wheel terminal point linear tap-changer will help to provide a reliable supply of electricity. An efficient distribution grid has as little equipment as possible. This enables savings of both investment as operating expenses. Voltage regulation distribution transformers with linear tap changers help to improve the efficiency of grid sections. Using them can reduce the total number of secondary substations.

Samples Technical Data

Specifications		WST 30	WST 63	WST 125	WST 250	WST 400	WST 500
Phase number		three-phases
Connection mode		Central point(Ⅱ) Neutral Point(Ⅲ) Terminal Point(Ⅰ)
Rated through current(A)		30	63	125	250	400	500
Short-circuit capacity	Heat stableness current(KA/2s)	0.7	1.6	2.5	3.75	4	5
	Dynamic stableness current(KA)	1.8	4	6.25	9.375	10	12.5
Rated frequency		50～60
Insulation level(KV)	Rated Voltage	10KV		20KV		35KV
	Power-frequency withstand Voltage（50Hz／1min)	42KV		55KV		95KV
	Impulse（1.2／50μs)	75KV		125KV		250KV
Sealing Performance（KPa/24h）		60
Machine life(Thousands of times)		2

Samples Installation Dimension

No.	Model No.	Regulating position	Install dimension mm
No.	Model No.	Regulating position	L	L1	L2	L3	L4	L5	H	H1
1	WSTⅡ63/10-4×3	Central	376	143	122	59	99	24	100	78
2	WSTⅡ125/10-4×3		431	163	142	59	107	29	100	78
3	WSTⅡ250/10-4×3		431	163	142	59	112	29	100	78
4	WSTⅡ300/10-4×3		530	203	169	69	112	34	106	78
5	WSTⅡ63/20-4×3		426	168	137	59	99	24	100	78
6	WSTⅡ125/20-4×3		475	183	154	59	107	29	102	78
7	WSTⅡ250/20-4×3		530	203	169	59	112	34	102	78
8	WSTⅡ63/35-4×3		526	218	157	59	103	24	120	98
9	WSTⅡ125/35-4×3		580	228	179	59	107	34	120	98