GE 869 - Protection

4–108 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Protection
The 869 protection elements are organized in six (6) identical setpoint groups: Setpoint
Group 1 to Setpoint Group 6.
Figure 4-33: Protection Display Hierarchy
Each Setpoint Group has the same protection functions, depending on the relay order
code.
Motor Elements
• Percent Differential
• Thermal Model (49)
• Current Unbalance (46)
• Mechanical Jam (50LR)
• Undercurrent (37)
• Loss of Excitation (40)
• Overload Alarm
• Short Circuit
• Ground Fault (50SG)
• Acceleration Time
• Underpower (37P)
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Data Capture
Level 1 Level 2 Level 3 Level 4
e
Power
Frequency
Voltage
Current
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Motor
2-Speed Motor
Testing
Impedance