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A potential transformer is essentially a

  • A.small power transformer worked at very light load
  • B.current transformer connected the other way round in the circuit
  • C.capacitive divider with an electromagnetic unit at its lower end
  • D.transformer whose secondary is always short circuited in service

Answer: A

Its construction is that of an ordinary two-winding transformer, but the burden is only a voltmeter or relay coil, so it operates at a small fraction of the load its size would suggest. That light loading is what keeps its regulation, and hence its ratio error, small.

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