Main Faults in Alternator and Protective Devices:
- Stator Phase Fault (87G)
- Field Ground Fault (64F)
- Stator Ground Fault (87N, 51N, 59N, 27-3N)
- 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)
- SystemBackup
Diagram showing protective Devices used for protecting above Faults
Table for Fault sensing and Protective Devices:
