Plastic Wheel Linear Tap-changer

Plastic wheel L inear T ap-changer OFF-Load Tap Change : Mainly Used in Solar Power Project, Wind Projects. Here Generating voltage level is LT at Conversion Level. Solar Inverter Duty oil type Transformer & Dry Type Transformer is having OFF-Load Tap Change. Tap Changing will happen While...

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Product Introduction

Plastic wheel Linear Tap-changer

OFF-Load Tap Change: Mainly Used in Solar Power Project, Wind Projects. Here Generating voltage level is LT at Conversion Level. Solar Inverter Duty oil type Transformer & Dry Type Transformer is having OFF-Load Tap Change.

Tap Changing will happen While Transformer is in OFF-Load or No-Load. In Dry Type Transformer, Cooling Phenomenon mainly is Air Natural. Normally In ON-Load Tap Changer, Arc Quenching will be limited by medium of Oil When Transformer is ON-Load. But OFF-Load Tap Changer, Tapping will be done only When Transformer is in OFF-Switch Condition. In Dry Type Transformer Air is the only cooling medium which is limited Energy to Arc Quench.

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.

Model Explanation
WST □ - □/□-□╳□
W: off-circuit
S : three-phase or D for single phase
T : linear type tap chager
□: voltage regulation model
□: rated current
□: rated voltage
□: number of tapping heads
□: number of tapping position

Voltage Regulation Model
I  : terminal point
II :   central point
III : neutral point
   IV : Y-△ conversion
   V : series-parallel connection

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

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