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Two steam driven alternators are operating in parallel. The load sharing between them may be adjusted by varying the:
1. power factor of the alternator
2. field strength of the alternator
3. steam supply to their prime movers
4. speed of the alternator

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Correct Answer - Option 3 : steam supply to their prime movers

Concept:

The alternators to be operated in parallel should meet some requirements so as to make their operation proper.

  • They must have the same output voltage rating.
  • The rated speeds of the machines should be such as to give the same frequency (f being equal to PN/120).
  • The alternators should be of the same type so as to generate voltages of the same waveform. They may differ in their kVA ratings.
  • The prime movers of the alternators should have same speed-load characteristics, which of course must be drooping ones, so as to load the generators in proportion to their output ratings.
  • The alternators should have reactance in their armatures; otherwise they will not operate in parallel successfully.

 

Explanation:

Two steam driven alternators are operating in parallel. The load sharing between them will be varied based on the steam supply to the prime movers.

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