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Why TAP changer provided in primary side of HT
transformer ? and why not in secondary?
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Answer Posted / jayakumar
If only one tap changer is required, tap points are usually made on the high voltage, or low current, side of the winding to minimize the current handling requirements of the contacts. However, a transformer may include a tap changer on each winding if there are advantages to do so. For example, in power distribution networks, a large step-down transformer may have an off-load tap changer on the primary winding and an on-load tap changer on the secondary winding.
Reference from Wikipedia
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