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Transformer Question No. 26 - Transformer tap changers in auto/manual
Tap Changers: Designed to adjust for varying input voltages by automatically transferring taps on a power transformer. The main advantage of tap changes over other voltage regulation technology is high efficiency. Other advantages are wide input range, high overload current capability and good noise isolation. Disadvantages are noise created when changing taps and no waveform correction

Author : Lucas van der Merwe - From: South African
Thu, July 2nd, 2009 - 17:45
In on-load tap changing via relevant voltage control system (AVR), generally we front of induced voltage disturbance due to switching of inductance circuit. It is clear, when we don’t want that automatic control system by chosen of manual tap changing, that disadvantage can be forgotten. 
Author : Hamid - From: IRAN
Fri, July 24th, 2009 - 16:15
The noise in AVR is much different from the noise generated by the transformer and they do not  add up  . The basic characteristics are completely different in both the cases  and they will not super impose upon each other . 
Author : R K Mohapatra - From: India
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