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The main function of the pilot exciter in the larger alternator is

  • The main function of the pilot exciter in a larger alternator is to provide the necessary field excitation to the main exciter, which in turn provides the excitation to the main field winding of the alternator.
  • The pilot exciter is a small generator that is connected to the main exciter and is used to supply the initial field excitation to the main exciter when the alternator is started up.
  • Once the main exciter has been initially energized, it can then provide its own excitation to the main field winding and maintain the field current required for the alternator to generate electrical power.
  • Therefore, the pilot exciter acts as an auxiliary source of excitation that is used to initiate the excitation of the main exciter and main field winding.
  • The main function of the pilot exciter is not to provide the excitation to the main field winding directly, but rather to provide the initial excitation required to start the excitation process.