GE Industrial Solutions Entellisys System User Manual - Manual (Page 216)

Alarms and events 216
A
Relays - Frequency and Reverse Power
Alarm Pickup Reverse Power Alarm only reverse power relay has entered
pickup
Alarm Reverse Power Alarm only reverse power relay has operated
Alarm Dropout Reverse Power Alarm only reverse power relay has dropped
out of pickup
Pickup Reverse Power Reverse power relay has entered pickup
Breaker Trip Reverse Power Reverse power relay has operated
Dropout Reverse Power Reverse power relay has dropped out of
pickup
Alarm Pickup Underfrequency Alarm only underfrequency relay has
entered pickup
Alarm Underfrequency Alarm only underfrequency relay has
operated
Alarm Dropout Underfrequency Alarm only underfrequency relay has
dropped out of pickup
Voltage Below Underfreq Alarm
Blocking Voltage The voltages on all three phases have
dropped below the alarm only
underfrequency blocking voltage threshold.
Voltage Above Underfreq Alarm
Blocking Voltage The voltage on at least one of the three
phases has exceeded the alarm only
underfrequency blocking voltage threshold.
Pickup Underfrequency Underfrequency relay has entered pickup
Breaker Trip Underfrequency Underfrequency relay has operated
Dropout Underfrequency Underfrequency relay has dropped out of
pickup
Voltage Below Underfrequency
Blocking Voltage The voltages on all three phases have
dropped below the underfrequency blocking
voltage threshold.
Voltage Above Underfrequency
Blocking Voltage The voltage on at least one of the three
phases has exceeded the underfrequency
blocking voltage threshold.
Alarm Pickup Overfrequency Alarm only overfrequency relay has entered
pickup
Alarm Overfrequency Alarm only overfrequency relay has
operated
Table A-2 Sequence of events description and troubleshooting guide
Event Description Notes and Troubleshooting tips