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Plastic Hand-wheel Tap-changer 

On load tap changers are the ones where taps in the transformers change automatically as per loads variations. The appropriate taps are selected by the transformers tap changers mechanism automatically in accordance with the loads and the voltage drops as a result to coop with the set or desired transformer turns ratio. There is always a wide variety of taps available in the transformer to meet the system requirements.

The off load tap changers are Non automatic and are those transformers where you can change the tap manually, if required, but with the transformer completely DE-energized.

Various special tap changers can be designed and manufactured according to requirement of customers. Our company is the first one in domestic market of China to invent and have fully independent proprietary intellectual property rights of intelligent on load capacity and voltage regulation technology professional manufacturer. The series of products has been identified by experts to fill in the domestic industry gap and reach the international advanced level. At present, this product has been stably operated in the state grid.

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(?) Neutral Point(?) Terminal Point(?)
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