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The overload compensation of an energy meter is needed because at heavy currents

  • A.the series magnet begins to saturate
  • B.the friction of the bearings rises sharply with the increased speed of the disc
  • C.the temperature of the pressure coil rises and its resistance increases
  • D.the braking magnet loses part of its permanent magnetism

Answer: A

Saturation makes the series flux rise less than in proportion to the current, so the meter would register low on overload. A magnetic shunt across the series magnet, or a saturable flux diverter, restores the proportionality over the working range.

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