In This Chapter

Tap Changers and Smart Intelligent Controls

Authored by: Dieter Dohnal , Axel Kraemer , Karsten Viereck

Electric Power Transformer Engineering

Print publication date:  May  2012
Online publication date:  May  2012

Print ISBN: 9781439856291
eBook ISBN: 9781439856369
Adobe ISBN:


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The common method of controlling the voltage level of transformers is to equip the transformer with tappings in the winding. The voltage variation will be achieved by changing the turn ratio. The tap changer changes the ratio of a transformer by adding turns to or subtracting turns from either the primary or the secondary winding. Therefore, the transformer is equipped with a so-called regulating or tap winding that is connected to the tap changer. The execution of a tap-change operation with a tap changer can be done with the transformer de-energized, when tap-changing is required rare, or it can be done with the transformer energized that means on-load. For these different demands, de-energized tap changers or on-load tap changers are used, controlled by intelligent regulating devices.

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