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The inrush current when a transformer is energised can reach

  • A.a small fraction of its rated current only
  • B.its short-circuit current and remain there
  • C.several times its rated current for a few cycles
  • D.exactly its rated current from the first instant

Answer: C

Switching at an unfavourable instant drives the core into deep saturation for part of each cycle, so a large asymmetric current flows until the transient decays. Protection has to be arranged so that the inrush does not trip it.

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