GE MI-869 - Protection

CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–103
Protection
The 869 protection elements are organized in six (6) identical setpoint groups: Setpoint
Group 1 to Setpoint Group 6.
Figure 4-27: Protection Display Hierarchy
Each Setpoint Group has the same protection f
unctions, depending on the relay order
code. These protection functions include:
Motor Elements
• Percent Differential
• Thermal Model
• Current Unbalance
• Mechanical Jam
•Undercurrent
•Overload Alarm
• Short Circuit
• Ground Fault
• Acceleration Time
•Underpower
2-Speed Motor Elements
• Speed2 Thermal Model
• Speed2 Acceleration
• Speed2 Undercurrent
Current Elements
• Phase Time Overcurrent
• Phase Instantaneous Overcurrent
• Phase Directional Overcurrent
• Neutral Time Overcurrent
• Neutral Instantaneous Overcurrent
• Neutral Directional Overcurrent
Setpoints
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Data Capture
Level 1 Level 2 Level 3 Level 4
Data Capture
Power
Frequency
Voltage
Current
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Motor
2-Speed Motor
Testing