CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–109
2-Speed Motor Elements
• 2-Speed Thermal Model
• 2-Speed Acceleration
• 2-Speed Undercurrent
Current Elements
• Phase Time Overcurrent Protection (51P)
• Phase Instantaneous Overcurrent Protection (50P)
• Phase Directional Overcurrent Protection (67P)
• Neutral Time Overcurrent Protection (51N)
• Neutral Instantaneous Overcurrent Protection (50N)
• Neutral Directional Overcurrent Protection (67N)
• Ground Time Overcurrent Protection (51G)
• Ground Instantaneous Overcurrent Protection (50G)
• Negative Sequence Instantaneous Overcurrent Protection (50_2)
Voltage Elements
• Phase Reversal (47)
• Undervoltage Curves
• Phase Undervoltage Protection (27P)
• Phase Overvoltage Protection (59P)
• Auxiliary Undervoltage (27X)
• Auxiliary Overvoltage Protection (59X)
• Neutral Overvoltage Protection (59N)
• Negative Sequence Overvoltage Protection (59_2)
• Volts per Hertz (24)
Impedance Elements
• Out-of-step (78)
Power Elements
• Directional Power (32)
• Reactive Power (40Q)
Frequency Elements
• Underfrequency (81U)
• Overfrequency (81O)
• Frequency Rate of Change (81R)
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