LOP Protection Timing

When one or two phases are lost, the LOP Timeout timer and the Supply Timeout timer start to run simultaneously.

When the Supply Timeout timer expires, an event (for example, Ai Dead) is logged to indicate that the phases is dead.

When the LOP Timeout timer expires, another event (for example, A Phase LOST) is logged. The LOP Timeout timer can be checked by adding the Supply Timeout setting to the period measured between the two events.

If LOP protection is set to Trip, the ACR will trip immediately A Phase LOST is logged.

This event will be followed by Protection Trip Request and LOP Protection Trip.