EA003 - Using Synchrophasor Data to Identify a Failing Potential Transformer

Release Date
Document Subject Area
Event Analysis
CRSTT Use Case

An ATC Operations Engineer was using synchrophasor data to review fault operations and stumbled across the odd voltage signature shown below from a PMU monitoring one of our 69 Kv substations. One of the three voltage phases would “drift” away from the other two phase voltages and then eventually jump back to normal. The behavior was not observed on the voltage data from PMUs at nearby stations so it was determined this was not a system problem.

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