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Instrument transformers are used in preference to shunts and multipliers on high voltage systems chiefly because they

  • A.isolate the instruments from the high voltage
  • B.are cheaper to manufacture than a shunt of the same current rating would be
  • C.introduce no error of any kind into the measurement being made
  • D.allow the instrument to be read without any correction factor being applied

Answer: A

A multiplier for eleven kilovolts would place that voltage on the instrument terminals, which is intolerable. A transformer keeps the instrument and the operator at a low potential while scaling the quantity, and it dissipates far less power than a shunt or multiplier would.

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