Generally In transformer Tap Changer on HT side, but I have
seen in 66KV side in 220/66 KV, 100 MVA, Areva make
transformer. Why ?
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Answer Posted / ajay kumar
Maximum tap changer connected in HT side because due to
high voltage current level will be low and during operation
of OLTC low current will pass and there will be less risk
to operate on load
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