GE 845 Instruction Manual page 245

CHAPTER 4: SETPOINTS
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-56: Protection Display Hierarchy
Level 1
Each Setpoint Group has the same protection functions, depending on the relay order
code. These protection functions include:
Transformer Elements
• Percent Differential
• Transformer Overload
• Instantaneous Phase Differential
Current Elements
• Phase Time Overcurrent
• Phase Instantaneous Overcurrent
• Phase Directional Overcurrent
• Neutral Time Overcurrent
• Neutral Instantaneous Overcurrent
• Neutral Directional Overcurrent
• Ground Time Overcurrent
• Ground Instantaneous Overcurrent
• Ground Directional Overcurrent
• Negative Sequence Time Overcurrent
• Negative Sequence Instantaneous Overcurrent
• Negative Sequence Directional Overcurrent
• Restricted Ground Fault
Voltage Elements
• Phase Undervoltage
• Auxiliary Undervoltage
• Phase Overvoltage
• Auxiliary Overvoltage
• Neutral Overvoltage
• Negative Sequence Overvoltage
Device
System
Inputs
Group 1
Outputs
Data Capture
Group 2
Protection
Group 3
Monitoring
Group 4
Control
Group 5
FlexLogic
Group 6
Level 2 Level 3
PROTECTION
Current
Data Capture Voltage
Power
Frequency
Level 4
4–141