GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 81)

Single Point Relay protection 81
5
Figure 5-8 Phase Loss Relay settings
The phase rotation is set at the factory and cannot be changed by the user.
5.2.5.5 Usage
Phase Loss goes into pickup whenever the negative-phase sequence voltage is greater than the
pickup threshold set by the user. The Phase Loss Relay trips or sets off the alarm with the time
delay set by the user.
Event logging
The events generated by a Phase Loss Relay are:
•
Alarm Pickup Phase Loss – Alarm only phase loss relay has entered pickup.
•
Alarm Phase Loss – Alarm only phase loss relay has operated.
•
Alarm Dropout Phase Loss – Alarm only phase loss relay has dropped out of pickup.
•
Voltage Below Phase Loss Alarm Blocking Voltage – The voltages on all three phases have
dropped below the alarm only phase loss blocking voltage threshold.
•
Voltage Above Phase Loss Alarm Blocking Voltage – The voltage on at least one of the three
phases has exceeded the alarm only phase loss blocking voltage threshold.
•
Pickup Phase Loss – Phase loss relay has entered pickup.
•
Breaker Trip Phase Loss – Phase loss relay has operated.
•
Dropout Phase Loss – Phase loss relay has dropped out of pickup.