Discussion
Tap changing is normally provided on the high-voltage winding because
Answer: B
Correct answer: the current there is smaller and the switchgear cheaper
Ampere-turns balance means the high-voltage winding carries the smaller current, so the tap changer contacts and the switching duty are lighter and the equipment cheaper. The high-voltage winding also has more turns available, giving finer voltage steps. The higher voltage does complicate the insulation, but the current saving outweighs it.
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