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Generator Protection


Generator protection requires the consideration of many abnormal conditions that are not present with other system elements. The abnormal conditions that may occur with generators include


  1. Overheating
  2. Stator (due to overload or loss of cooling)
  3. Rotor (due to overexcitation, loss of cooling , negative sequence stator currents)
  4. Winding faults
  5. Stator (phase and ground faults)
  6. Rotor (ground faults and shorted turns)
  7. Overspeed and underspeed
  8. Overvoltage
  9. Loss of excitation
  10. Motoring
  11. Unbalanced current operation
  12. Out of step
  13. Subsynchronous oscillations
  14. Inadvertent energization
  15. Nonsynchronized connection


We generally evaluate the protection settings based on relay application manuals provided by the relay manufacturers and use variety of analytical tools and calculations where needed for further investigations to assess the adequacy of protection and relay performance.



Related Links


http://www.powerapps.org/Power System Protection Studies and Relay Coordination.aspx 



Mail your questions, enquiries to raghunatha@powerapps.org