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The reason a current transformer core is often made of nickel iron alloy rather than ordinary silicon steel is that it has

  • A.much higher permeability at low flux density
  • B.a much higher saturation flux density
  • C.a much lower cost per kilogram than the silicon steel it replaces
  • D.a lower resistivity

Answer: A

The exciting current at the low flux densities of normal service is what determines the error, and nickel iron alloys need far less of it. They saturate at a lower flux density than silicon steel, which for a metering core is a positive advantage.

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