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On-load tap changing allows the ratio of a transformer to be altered

  • A.without interrupting the supply to the load
  • B.only after the transformer has been de-energised
  • C.only in steps of ten per cent or more
  • D.only on the low-voltage winding

Answer: A

A diverter switch transfers the current through a transition impedance so that neither an open circuit nor a short circuit occurs during the change. Off-circuit tapping links, by contrast, require the transformer to be isolated.

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