GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 287)

Alarms and events description and system troubleshooting guide 275
A
Dropout Overfrequency Overfrequency relay has dropped out of pickup
Voltage Below Overfrequency
Blocking Voltage The voltages on all three phases have dropped
below the overfrequency blocking voltage
threshold.
Voltage Above Overfrequency
Blocking Voltage The voltage on at least one of the three phases has
exceeded the overfrequency blocking voltage
threshold.
Bus Differential Events
Pickup Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has entered
pickup
Dropout Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has
dropped out of pickup
Breakers Trip Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has
operated and tripped the breakers
Breakers Trip Backup Bus Diff
Zone 1…4 Settings1 Bus differential backup for zone 1…4, settings 1 has
operated and tripped the breakers
Pickup Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has entered
pickup
Dropout Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has
dropped out of pickup
Breakers Trip Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has
operated and tripped the breakers
Breakers Trip Backup Bus Diff
Zone 1…4 Settings2 Bus differential backup for zone 1…4, settings 2 has
operated and tripped the breakers
Alarm Pickup Bus Diff Zone 1…4
Settings 1 Alarm only bus differential for zone 1…4, settings 1
has entered pickup
Alarm Dropout Bus Diff Zone
1…4 Settings 1 Alarm only bus differential for zone 1…4, settings 1
has dropped out of pickup
Alarm Bus Diff Zone 1…4
Settings 1 Alarm only bus differential for zone 1…4, settings 1
has operated
Alarm Pickup Bus Diff Zone 1…4
Settings 2 Alarm only bus differential for zone 1…4, settings 2
has entered pickup
Alarm Dropout Bus Diff Zone
1…4 Settings 2 Alarm only bus differential for zone 1…4, settings 2
has dropped out of pickup
Alarm Bus Diff Zone 1…4
Settings 2 Alarm only bus differential for zone 1…4, settings 2
has operated
Table A-9 Protection Relay Events
Event Description Notes and Troubleshooting tips