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The core of a current transformer is made of a material with

  • A.a large hysteresis loop
  • B.a low saturation flux density
  • C.high permeability and low loss
  • D.high reluctance

Answer: C

The whole error of a current transformer comes from the current needed to magnetise the core and supply its loss, so both must be minimised. Nickel iron alloys of very high permeability are used for metering cores, at the cost of saturating at a low flux density.

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