Transcription of Ch 11 - Generator Protection
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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 Windi
Overexcitation and Overvoltage Protection (24, 59) •Modern Excitation Systems include over excitation limiting and protection, but it may take several seconds to limit •Overexcitation occurs when the V/Hz ratio exceeds 105% at FL and 110% at no load •V/Hz relays set at 110% with a 5 – 10 sec delay •Generator overvoltage can occur ...
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