De-energized Tap Changer

Product Detail

De-energized Tap Changer

This is a relatively recent development which uses thyristors both to switch the transformer winding taps and to pass the load current in the steady state. The disadvantage is that all non-conducting thyristors connected to the unselected taps still dissipate power due to their leakage currents and they have limited short circuit tolerance. This power consumption can add up to a few kilowatts which appears as heat and causes a reduction in overall efficiency of the transformer; however, it results in a more compact design that reduces the size and weight of the tap changer device. Solid state tap changers are typically employed only on smaller power transformers.

A multiphase reactor-switching tap selector has a single geneva mechanism operating three shafts which traverse phase plates carrying all of the contacts and the vacuum switching cell and rapid release mechanism for each of the phases. The geneva mechanism operates the tap selection contacts directly through its shaft and is coupled to other shafts for operating the pre-selector contacts, the bypass contacts and the vacuum switching cells. All three shafts traverse all of the phase plates.

Professional workmanship, plenty of know-how, the right dash of improvisation skills and lots of hands-on experience - just the right mix to make our service specialists are perfect for your tasks. Regular training up-grades and advanced training classes ensure our staff’s continuous high-level competence. The best guarantee for a professional and state-of-the-art maintenance performance. And our specialists’ know-how does not end at today´s Jinli tap-changer type series. They are just as competent when it comes to older type tap-changers,

Model Explanation
 WSP ? - ?/?-???
    W:  off-circuit
    S :  three-phase or D for single phase
    P :  round 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


Samples Technical Data

Specifications		WSP 63	WSP 125	WSP 250
Phase number		three-phases
Connection mode		Central point (?)  Neutral point (?)
Rated through current (A)		63	125	250
Short-circuit capacity	Heat stableness current(KA/2s)	1.6	2.5	3.75
	Dynamic stableness current(KA)	4	6.25	9.375
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