850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–1
850 Feeder Protection System
Chapter 6: Protection Setpoints
GE
Grid Solutions
Protection Setpoints
The 850 protection elements are organized in six (6) identical setpoint groups: Setpoint
Group 1 to Setpoint Group 6.
Figure 6-1: Protection Display Hierarchy
Each Setpoint Group has the same protection functions, depending on the relay order
code.
Current Elements
• Inverse Time Overcurrent Curves
• Percent of Load-To-Trip
• 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)
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Data Capture
Level 1 Level 2 Level 3 Level 4
Power
Frequency
Voltage
Current
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Testing
Undercurrent
Admittance
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