A New High-Speed Fault Detection Scheme for Transmission Line Based on Traveling Wave

This paper presents a new fault detection scheme for transmission line based on traveling wave. Using two-terminal synchronized measurements of voltages and currents of all phases, fault detection index is derived. To eliminate the effect of post-fault values on the results, superimposed components are used. This paper describes a new criterion for the identification of internal faults from external faults by using a simplified method and discuss about the effect of sampling frequency on close-in fault detection. Nevertheless, with commercial sampling frequency (10 kHz), we have an appropriate ability to distinguish typical close-in faults (more than 4 km) with this algorithm. The outputs from EMTP simulations are used to test and validate the proposed fault detection approach for typical power system faults by MATLAB program