CHAPTER 1: INTRODUCTION DESCRIPTION OF THE 889 GENERATOR PROTECTION SYSTEM889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 1–5Table 1-2: Other Device Functions47 Phase Reversal49 Thermal (RTD)49TOL Thermal Overload50/27 Inadvertent Energization50BF Breaker Failure50G Ground Instantaneous Overcurrent50SG Sensitive Ground Instantaneous Overcurrent50N Neutral Instantaneous Overcurrent50P Phase Instantaneous Overcurrent50_2 Negative Sequence Instantaneous Overcurrent50OFL Offline Overcurrent50OL Overload51G Ground Time Overcurrent51N Neutral Time Overcurrent51SG Sensitive Ground Time Overcurrent51V Voltage Restrained Time Overcurrent55 Power Factor59N Neutral Overvoltage59P Phase Overvoltage59X Auxiliary Overvoltage59_2 Negative Sequence Overvoltage64TN 100% Stator Ground using 3rd Harmonic Voltage Differential67G Ground Directional Element67N Neutral Directional Element67P Phase Directional Element67SG Sensitive Ground Directional Element67_2 Negative Sequence Directional Element76 Excitation Current Protection (dcmA)78 Out-of-step Protection81A Frequency out-of-band81O Overfrequency81U Underfrequency81R Frequency Rate of Change87G Generator Stator Differential87O Overall Unit (Gen-Xfrm) Protection87GD Restricted Ground Fault (RGF)AFP Arc Flash ProtectionVTFF VT Fuse FailureDescriptionAnalog InputAnalog OutputBreaker Arcing Current (I2t)Breaker ControlBreaker HealthData LoggerANSI Device Description
