Ch 11 - Generator Protection

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Generator CONTROL AND PROTECTIONGenerator ProtectionGENERATOR CONTROL AND PROTECTIONGenerator Protection Introduction Device Numbers Symmetrical Components Fault Current Behavior Generator Grounding Stator Phase Fault (87G) Field Ground Fault (64F) Stator Ground Fault (87N, 51N, 59N, 27-3N) Generator CONTROL AND PROTECTIONGenerator Protection Loss of Field (40Q, 40Z) Over/Under Frequency (81O/81U) Overexcitation and Overvoltage (24, 59) Out of Step (78) Negative Sequence (Current Unbalance) (46) Inadvertent Energization (27, 50, 60, 81, 62, 86) Loss of Voltage Transformer (60) System Backup (51V, 21) ConclusionGENERATOR CONTROL AND PROTECTIONGenerator Protection G64F6051N87T2481U47276287G5981O32-159N51 -GN32-227-3N40 51V50EI466349REG515125GENERATOR CONTROL AND PROTECTIONSteam Generator Stator WindingsGENERATOR CONTROL AND PROTECTIONHydraulic Generator Stator / RotorGENERATOR CONTROL AND PROTECTIONHydraulic Generator Stator CoreGENERATOR CONTROL AND PROTECTIONGenerator ProtectionGENERATOR CONTROL AND PROTECTIONSplit Phase Relaying CTGENERATOR CONTROL AND PROTECTIONCylindrical Rotor in Need of RepairGENERATOR CONTROL AND PROTECTIONGenerator Protection Generator CONTROL AND PROTECTIONGenerator Protection Generator CONTROL AND PROTECTIONSymmetrical Components Positive Sequence A set of three phasors

of the generator zone of protection • Voltage supervised time-overcurrent (51V) or distance relaying (21) may be used • Distance relay set to include generator step up transformer and reach beyond, into the system • Time delays must be coordinated with those of the system protection to assure that system protection will operate before back up

  Protection, Transformers