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High-speed alternators are driven by
1. diesel engines
2. hydraulic turbines
3. steam turbines
4. None of the above

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Correct Answer - Option 3 : steam turbines

Explanation:

  • In synchronous generators or alternator, generally salient-pole type of rotors is driven by hydro-turbines and cylindrical type rotors are driven by steam turbines 
  • Cylindrical rotors are used in high-speed alternators having speed between 1500 rpm to 3000 rpm and salient pole rotors are used in low-speed devices, from 100 rpm to 1500 rpm.
  • Cylindrical type rotors are used in turbo-alternators and these are made up of solid steel forging to get high mechanical stress.

Salient pole rotor

Cylindrical rotor

Large diameter and short axial length

Small diameter and long axial length

used for low-speed alternators

Used for high-speed turbo alternators

Has no projecting poles

Has no projecting poles

Needs damper windings

Do not need damper windings

Windage loss is more

Windage loss is less

 

As salient pole rotor has a large diameter and short axial length, length to diameter is ratio is very small.

As Non-salient pole type rotor has a small diameter and long axial length, length to diameter is ratio is very high.

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