Hydro Generator Rotor Earth Fault Installation of Carbon Dust Collection System

Published Jul 13th, 2023 IRMC 2023 - Peter Kelly


  • Planned replacement of Generator Rotor Earth Fault (REF) Relay on Unit 4.
  • Following REF Relay replacement – standing trip on HMI (Resistance < Min. Value) preventing the unit from starting.
  • Subsequent electrical testing determined genuine earth fault on the rotor.
  • Decision to pull rotor to determine the cause of the earth fault, further testing and cleaning.

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