Logo
Select Quick Pages:
Home
About
Contact Us
Disclaimer
Privacy policies
Terms and conditions

The driving power from the prime mover driving the alternator is lost but the alternator remains connected to the supply network and the field supply also remains on. The alternator will

  • If the driving power from the prime mover driving the alternator is lost but the alternator remains connected to the supply network and the field supply also remains on, the alternator will behave as a synchronous motor with the same rotation direction.
  • This is because the magnetic field of the rotor remains aligned with the rotating magnetic field of the stator, as long as the field excitation remains on.
  • Therefore, the alternator will continue to rotate in the same direction as before, but it will consume real power from the supply network to maintain its rotation.
  • This will result in a decrease in the power factor of the system, as the alternator is now consuming real power from the grid without producing any mechanical power.
  • However, if the alternator is not disconnected from the supply network, it may experience overloading and overheating due to excessive current flow.
  • Therefore, it is important to disconnect the alternator from the supply network as soon as possible when the driving power is lost.