DETECTION OF FAULT IN TRANSMISSION LINE DURING POWER SWING

Abstract

In normal condition distance relay's measured impedance is greater than set impedance. But during power swing the impedance measured by relay is less than the relay's set impedance. The result is tripping of relay during power swing without having any fault. So relay should be blocked & should trip after a fault occur during power swing. Here our aim is only to detect fault at the time of power swing. Four methods are discussed in the report. Methods are wavelet based (one line with fix capacitor), fuzzy c-means clustering, auto regression, rate of change of power (for symmetrical fault detection). A double circuit line model is simulated in pscad