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The secondary winding of a current transformer is distributed uniformly round the core so as to

  • A.make the insulation between turns easier to apply during manufacture
  • B.reduce the leakage flux
  • C.share the heating of the winding equally over the whole of the core surface
  • D.allow the winding to be tapped at several points for different ratios

Answer: B

A concentrated winding leaves parts of the core linked by flux that does not link the winding, and that leakage adds to the error and worsens the behaviour at high currents. A uniform distribution round a toroid is the best arrangement obtainable.

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