EA001 - Using Synchrophasor Data to Analyze Fault Event Causes

A transmission fault was cleared properly by the appropriate line protection equipment.  When reviewing the synchrophasor voltage data for the fault from a nearby station (see Figure 1 below) it became obvious that the initiating event for the transmission system fault was most likely on the distribution system.  Several multi-phase events were observed where the first of these eventually migrated to a phase to ground transmission fault.