6–2 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: PROTECTION SETPOINTS
• Neutral Directional Overcurrent Protection (67N)
• Ground Time Overcurrent Protection (51G)
• Ground Instantaneous Overcurrent Protection (50G)
• Ground Directional Overcurrent Protection (67G)
• Sensitive Ground Time Overcurrent Protection (51SG)
• Sensitive Ground Instantaneous Overcurrent Protection (50SG)
• Sensitive Ground Directional Overcurrent Protection (67SG)
• Restricted Ground Fault (87G)
• Switch on to Fault (SOTF)
• Negative Sequence Time Overcurrent Protection (51_2)
• Negative Sequence Instantaneous Overcurrent Protection (50_2)
• Negative Sequence Directional Overcurrent Protection (67_2)
• Broken Conductor
• Load Encroachment
• Undercurrent (37)
• Thermal Overload (49)
Voltage Elements
• Undervoltage Curves
• Phase Undervoltage Protection (27P)
• Timed Undervoltage Protection (27T)
• UV Reactive Power (27Q)
• Auxiliary Undervoltage (27X)
• Phase Overvoltage Protection (59P)
• Auxiliary Overvoltage Protection (59X)
• Neutral Overvoltage Protection (59N)
• Negative Sequence Overvoltage Protection (59_2)
Admittance Elements
• Neutral Admittance (21YN)
Power Elements
• Directional Power (32)
• Wattmetric Ground Fault (32N)
Frequency Elements
• Underfrequency (81U)
• Overfrequency (81O)
• Frequency Rate of Change (81R)
• Fast Underfrequency
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