What is the necessity of tap changing in a transformer?

DWQA Questions › Category: Transformer › What is the necessity of tap changing in a transformer?
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Deena asked 7 years ago
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How Engineering Works Staff answered 7 years ago

Mostly to fine tune the output of the secondary in terms of voltage.
Given that AC Mains voltages can vary over a range of +/-10% and a more accurate secondary output is needed, then taps on either the primary or secondary can be used to accomplish this.