Power Swing Detection using PMU for Preventing false trip of Distance protective Relay

What is it about?

In conventional transmission line protection, a distance protective relay may be used as primary as well as remote backup protection. The voltage and current phasors measurement needed by the distance relay for determining the impedance may be affected by the power swing. Consequently, this power swing may cause false trip of Zone three distance relays which in turn may affect on the reliability of the whole protective scheme. To mitigate these effects, this research work proposes a new real-time power swing detector using phasor measurement units for blocking the distance relay only during this transient disturbance, but, it will not block relay when the power swing accompanied with faults. To validate the present work, the performance of developed enhanced distance relay is tested by signals generated by Simulink/MATLAB simulator under different conditions.

Featured Image

Why is it important?

The proposed scheme including PMU based power swing detector provides good discrimination between the transient currents and the fault current which in turn it may contribute in enhancing the reliability of Distance protective relay.

Perspectives