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A zigzag connected winding is used to

  • A.eliminate the leakage reactance of the transformer
  • B.reduce the copper required in the windings
  • C.provide an earthing point with a low zero-sequence impedance
  • D.provide the highest possible voltage ratio available

Answer: C

Its geometry gives a low impedance to zero-sequence current and a high one to positive sequence, which makes it an effective earthing transformer on a delta system. It is a special-purpose connection rather than a general one.

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