A Novel Fault Location Method for Transmission Lines Based on Progressive Kurtosis in ±800 kV Kunbei Converter Station

Abstract

This paper proposed a practical traveling wave (TW)-based fault location methodology in a cost-effective way on high-voltage transmission lines. In order to cope with the difficulty of identifying the faulty reflected wavefront caused by TW attenuation and noise interference, a TW wavefront detection method using progressive kurtosis is developed to capture the precise arrival time of the reflected wave, which can significantly eliminate the influence of false wave head calibration existing in conventional methods. The correlation coefficient is used to compare the polarities of the initial and the second reflected TWs, so as to identify the source of the second reflected wave, and thus identifying the faulty segment. Finally, the precise fault distance can be calculated through the appropriate TW fault location formula. The proposed method is validated through several actual fault records obtained in ±800 kV Kunbei substation.