Generator Protection

  • Slowing boiler firing
  • Fuel supply is minimized
  • Running the generator at baseload

Types of Sub

faults & causes

Abnormal conditions in generator:

  • Mechanical
  • Electrical​

Mechanical:

Loss of prime mover

Over speeding

Electrical:

Unbalance loading

Loss of excitation

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Stator faults:

  1. Phase & earth faults
  2. Longitudinal differential protection scheme​
  3. Differential protection scheme using a balance resistor
  4. Modified differential protection
  5. Balanced earth fault protection
  6. Inter turn faults

Rotor faults:

Fig 6: DC Injection Method of Rotor Earth Fault Protection in Alternator
Fig 6: DC Injection Method of Rotor Earth Fault Protection in Alternator

Conclusion:

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AllumiaX Engineering

AllumiaX Engineering

Leaders in Industrial & Commercial Power Systems Engineering