Ch 11 - Generator Protection

Generator CONTROL AND PROTECTIONG enerator ProtectionGENERATOR CONTROL AND PROTECTIONG enerator 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 PROTECTIONG enerator 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 PROTECTIONG enerator Protection G64F6051N87T2481U47276287G5981O32-159N51 -GN32-227-3N40 51V50EI466349 REG515125 Generator CONTROL AND PROTECTIONS team Generator Stator WindingsGENERATOR CONTROL AND PROTECTIONH ydraulic Generator Stator / RotorGENERATOR CONTROL AND PROTECTIONH ydraulic Generator Stator CoreGENERATOR CONTROL AND PROTECTIONG enerator ProtectionGENERATOR CONTROL AND PROTECTIONS plit Phase Relaying CTGENERATOR CONTROL AND PROTECTIONC ylindrical Rotor in Need of RepairGENERATOR CONTROL AND PROTECTIONG enerator Protection Generator CONTROL AND PROTECTIONG enerator Protection Generator CONTROL AND PROTECTIONS ymmetrical Components Positive Sequence A set of

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

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