Drawing Central Point Linear Tap-changer

Drawing C entral P oint L inear T ap-changer If only one tap changer is required, manually operated tap points are usually made on the high voltage (primary) or lower current winding of the transformer to minimize the current handling requirements of the contacts. However, a transformer may...

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Product Introduction

Drawing Central Point Linear Tap-changer
If only one tap changer is required, manually operated tap points are usually made on the high voltage (primary) or lower current winding of the transformer to minimize the current handling requirements of the contacts. However, a transformer may include a tap changer on each winding if there are advantages to do so. For example, in power distribution networks, a large step-down transformer may have an off-load tap changer on the primary winding and an on load automatic tap changer on the secondary winding or windings. The high voltage tap is set to match long term system profile on the high voltage network (typically supply voltage averages) and is rarely changed. The low voltage tap may be requested to change positions multiple times each day, without interrupting the power delivery, to follow loading conditions on the low-voltage (secondary winding) network.

To minimize the number of winding taps and thus reduce the physical size of a tap changing transformer, a 'reversing' tap changer winding may be used, which is a portion of the main winding able to be connected in its opposite direction (buck) and thus oppose the voltage.

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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