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A capacitive voltage transformer is used at the highest system voltages because

  • A.a wound primary for such a voltage would be very costly to insulate
  • B.the capacitance of the divider provides a better ratio accuracy than iron can
  • C.it responds correctly to direct as well as to alternating voltage
  • D.no electromagnetic unit is needed anywhere in the arrangement

Answer: A

At four hundred kilovolts a conventional transformer becomes enormous and expensive. A capacitor stack divides the voltage down to a few kilovolts and a small electromagnetic unit then provides the standard secondary, which is far cheaper and doubles as a coupling for carrier signalling.

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