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How many numbers of coils will be there in a dynamo type power factor meter for balance three phase load?

How many numbers of coils will be there in a dynamo type power factor meter for balance three phase load? Correct Answer One current coil and two pressure coil

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  • The power factor meter measures the power factor of a transmission system.
  • The power factor meter determines the types of load using on the line, and it also calculates the losses occur on it.
  • The meter has one fixed coil which acts as a current coil. This coil is split into two parts and carry the current under test.
  • The meter has two identical pressure coils A and B. Both the coils are pivoted on the spindle.
  • The pressure coil A has no inductive resistance connected in series with the circuit, and the coil B has highly inductive coil connected in series with the circuit.
  • The current in the coil A is in phase with the circuit while the current in the coil B lag by the voltage nearly equal to 90°.
  • The meter has two deflecting torque one acting on the coil A, and the other is on coil B. The windings are so arranged that they are opposite in directions. The pointer is in equilibrium when the torques are equal.

Related Questions

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