METHOD OF DETERMINING FAULT LOCATION OF CABLE AND OVERHEAD POWER TRANSMISSION LINES Russian patent published in 2020 - IPC G01R31/08 

FIELD: physics.

SUBSTANCE: invention relates to electric power industry, namely to methods intended for determination of electric network damage point. Essence: instantaneous values of current and voltage are measured at frequency of 50 Hz and frequency of 10 kHz of current and voltage by sensors located at the ends of power transmission line. Instantaneous values of current and voltage are compared in high-frequency range for determination of direction of single-phase ground fault as per mutual phase of said parameters. Instantaneous values of current and voltage are compared in low-frequency range to determine fact of single-phase or phase-to-phase short-circuit on power transmission line. When wave processes occur in the monitored line, the lines of voltage values controlled at both ends of the line are oscillographed by analogue-to-digital conversion with sampling frequency of 1 MHz with accurate referencing to common astronomical time using global satellite positioning system and with subsequent calculation of distance to point of power transmission fault by difference of arrival time of wave front to each of power transmission line ends.

EFFECT: technical result is higher accuracy of determining point of faults of power transmission lines due to combined application of wave analysis of processes occurring in electric networks, and wave method of double-sided measurements.

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