GE 889 - Generator Elements

CHAPTER 4: SETPOINTS PROTECTION
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–113
• Sensitive Ground Instantaneous Overcurrent Protection (50SG)
• Sensitive Ground Directional Overcurrent Protection (67SG)
• Restricted Ground (Earth) Fault (87G)
• Negative Sequence Instantaneous Overcurrent Protection (50_2)
• Negative Sequence Directional Overcurrent Protection (67_2)
Voltage Elements
• Phase Reversal (47)
• Undervoltage Curves
• Phase Undervoltage Protection (27P)
• Auxiliary Undervoltage (27X)
• Phase Overvoltage Protection (59P)
• 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)
Generator Elements
Figure 4-36: Generator Elements Display Hierarchy
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Data Capture
Group 1
Generator Unbalance
Level 1 Level 2 Level 3 Level 4 Level 5
Group 2
Group 3
Group 4
Group 5
Group 6
Inadvertent Energization
Loss of Excitation
3rd Harm Neutral UV
3rd Harm Voltage Diff
Offline Overcurrent
Overall Percent Differential
Overload Alarm
Data Capture
Power
Frequency
Impedance
Voltage
Generator
Current
Percent Differential
Testing