GE Industrial Solutions Entellisys System User Manual - Manual (Page 69)

Single Point Relay protection 69
5
Figure 5-7 Settings for Under Frequency Relay
5.2.4.5 Usage
Event logging
While the relay is functional, the following events are logged for the under frequency relay in the
Entellisys CPU:
• Alarm Pickup Under Frequency – Alarm only under frequency relay has entered pickup.
• Alarm Under Frequency – Alarm only under frequency relay has operated.
• Alarm Dropout Under Frequency – Alarm only under frequency relay has dropped out of
pickup.
• Voltage Below Underfreq Alarm Blocking Voltage – The voltage has dropped below the alarm
only under frequency blocking voltage threshold.
• Voltage Above Underfreq Alarm Blocking Voltage – The voltage has exceeded the alarm only
under frequency blocking voltage threshold.
• Pickup Under Frequency – Under frequency relay has entered pickup.
• Breaker Trip Under Frequency – Under frequency relay has operated.
• Dropout Under Frequency – Under frequency relay has dropped out of pickup.
• Voltage Below Under Frequency Blocking Voltage – The voltage has dropped below the
under frequency blocking voltage threshold.
• Voltage Above Under Frequency Blocking Voltage – The voltage has exceeded the under
frequency blocking voltage threshold.
To view these events, click Sequence of Events on the Main Menu.