LOP Protection Settings
LOP protection is always available but can be selected Off if not required.
LOP protection can be in one of three operating modes:
-
OFF
-
Trip
-
Alarm
Table 58 LOP Protection Settings
|
LOP Setting |
Description |
|---|---|
|
Off |
LOP protection is non-operational |
|
Trip |
LOP protection operation will trip the switchgear |
|
Alarm |
LOP protection operation will not cause the switchgear to trip. Instead an alarm will be recorded in the Event Log and can be reported via a SCADA protocol or via an IOEX output, flexVUE status lamp etc. |
Once LOP protection has been set to either Trip or Alarm it will operate according to two settings:
-
LOP Voltage
-
The phase to earth voltage on one or two phases must fall below to start the LOP timer.
-
-
LOP Timeout
-
The time a LOP condition exists before either a protection trip occurs or an alarm is generated.
-