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An alternator is said to be over-excited when it is operating at

  • An alternator is said to be over-excited when it is operating at Lagging Power Factor.
  • When an alternator is overexcited, the excitation voltage applied to the rotor winding is increased beyond the value required for normal operation.
  • This results in an increase in the magnetic field strength and a corresponding increase in the voltage output of the alternator.
  • When the alternator is operating at a lagging power factor, it means that the load connected to it is inductive, and the alternator is supplying reactive power to the load.
  • Overexciting the alternator is a technique used to improve the power factor of the system.
  • By increasing the excitation voltage, the alternator can supply reactive power to the load, which helps to compensate for the inductive reactance of the load and improves the overall power factor of the system.