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Balance in a multi-element energy meter means that

  • A.the load on the three phases of the system is equal
  • B.the driving and braking torques are equal at rated load
  • C.the two discs of the meter turn at exactly the same speed
  • D.each element contributes the same torque for the same power

Answer: D

If one element is more effective than the other, the meter reads correctly only when the phases are equally loaded. The elements are therefore balanced during manufacture by testing each alone at the same power and equalising their torques.

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