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Which of the following auxiliaries is essential for starting the generating unit of a hydro plant?
1. Exciter
2. Fans and cooling oil pumps
3. Battery charging units etc.
4. Gate hoists

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Correct Answer - Option 1 : Exciter

Exciter:

  • The generator which gives dc supply to the rotor of alternator is called exciter.
  • The rotor or the field coils in a generator produce the magnetic flux that is essential to the production of electric power.
  • The rotor is a rotating electromagnet that requires a DC electric power source to excite the magnetic field. This power comes from an exciter.
  • The exciter is a small DC generator coupled to the same shaft as the rotor.
  • Therefore, when the rotor rotates this exciter produces the power for the electromagnet.
  • Control of the exciter output is done by varying the field current of the exciter.
  • This output from the exciter then controls the magnetic field of the rotor to produce a constant voltage output by the generator. 

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