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The errors of a potential transformer arise mainly from

  • A.the capacitance between its primary and secondary windings
  • B.the phase angle of the burden connected across its secondary terminals
  • C.the voltage drops in its windings and its exciting current
  • D.the saturation of its core at the voltages at which it works

Answer: C

Both the resistive and the reactive drops in the two windings reduce the secondary voltage and shift its phase, and the exciting current contributes its own drop in the primary. The remedies are a low-reluctance core and generous copper, just as with a good power transformer.

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