GEK-113285A G650 Generator Protection & Control System 2-3
2 PRODUCT DESCRIPTION 2.2 SUMMARY
2
2.2SUMMARY 2.2.1 ANSI DEVICE NUMBERS AND FUNCTIONS
DEVICE NUMBER FUNCTION
24 Volt/Hertz (only enhanced model)
25 Synchronism Check
27P Phase Undervoltage
27X Auxiliary Undervoltage
32DIR Directional Power
40 Loss of Excitation
46 Generator Unbalance
47 Negative Sequence Overvoltage
49S Generator thermal model
50/27 Inadvertent Generator Energization
50-2/51-2 Negative Sequence IOC/TOC
50BF Breaker Failure (only enhanced model)
50G
Ground Instantaneous Overcurrent (measured from 4
th
current transformer)
50N Neutral Instantaneous Overcurrent (calculated from the phase currents)
50P Phase Instantaneous Overcurrent
51G
Ground Time Overcurrent (measured from 4
th
current transformer)
51N Neutral Time Overcurrent (calculated from the phase currents)
51P/V Voltage Restraint Overcurrent
50SG/51SG Sensitive Ground Fault (only enhanced model)
55 Power Factor Limiting (Only enhanced model)
59N Neutral Overvoltage
59P Phase Overvoltage
59X Auxiliary Overvoltage
59G Ground Overvoltage
67N Neutral directional
67G Ground Directional
78V Phase shift / Loss of mains (only enhanced model)
810 Overfrequency
81U Underfrequency
81R Frequency Rate of Change
87G Restricted Ground Fault (only enhanced model)
VTFF VT Fuse Failure (only enhanced model)
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