Series-parallel Off Load Tap Changer

Series-Parallel Off Load Tap Changer

A tap changer is a device fitted to power transformers for regulation of the output voltage to required levels. This is normally achieved by changing the ratios of the transformers on the system by altering the number of turns in one winding of the appropriate transformer/s. Supply authorities are under obligation to their customers to maintain the supply voltage between certain limits. Tap changers offer variable control to keep the supply voltage within these limits.

Tap-changer can either be resistive or reactive. The tap changer with a resistive type of impedance uses high speed switching, whereas the reactive type uses slow moving switching. High speed resistor switching is now the most popular method used worldwide, and hence it is the method that is reviewed in this report.
The tapped portion of the winding may be located at one of the following locations, depending upon the type of winding:
(a) At the line end of the winding;
(b) In the middle of the winding;
(c) At the star point.

Model Explanation
 WSL□ □/□-□╳□ □
    W:  off-circuit
    S :  three-phase
    L :  cage type
    □:  voltage regulation model  
    □:  rated current
    □:  rated voltage
    □:  number of tapping heads
    □:  number of tapping position
    □:  L for vertical ; W for horizontal
    D for top tank installation; WD for bell-type installation  

Voltage Regulation Model
    I  :  linear regulating
    II :   central point
    III :  neutral point
   IV :  Y-△ conversion
    V :   series-parallel connection
   VI:   positive and negative regulation 

Samples Technical Data

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