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Overspeed protection of the generator is done by

  • Overspeed protection of the generator is done by the governor.
  • The governor is an important component of a generator that helps regulate its speed and ensure that it operates within safe limits.
  • In an alternator or generator, the prime mover (such as a steam turbine or gas engine) is used to rotate the rotor at a particular speed.
  • The governor is responsible for controlling the prime mover to maintain the speed of the generator within a specific range.
  • If the speed of the generator exceeds its rated speed, it can cause mechanical stresses and damage to the system.
  • The governor senses this overspeed condition and acts to reduce the input to the prime mover, which in turn reduces the speed of the generator.
  • Thus, the governor acts as a protective mechanism to prevent the generator from operating at dangerously high speeds and ensures its safe and efficient operation.