Wire single-phase earth fault single-end ranging method using ranging scale minimum principle

Abstract

The invention discloses a wire single-phase earth fault single-end ranging method using a ranging scale minimum principle. The method includes: measuring fault-phase voltage, fault-phase current and fault-phase negative-sequence current and zero-sequence current at a transmission line protecting mounting position; selecting initial fault distance as 1x which is increased gradually by a step length delta 1, sequentially calculating ranging scale e (1x) of each point in the whole transmission line, and selecting the distance from the point with the smallest ranging scale e(1x) to the transmission line protecting mounting position as fault distance. Physical features of transmission line voltage and current transmission are described through distribution parameters, ranging precision is unaffected by transmission line ground capacitors, and the method is applicable to single-phase earth fault single-end ranging of transmission lines of optional voltage grades, especially applicable to single-phase earth fault single-end ranging for transmission lines with ultrahigh voltage.

Description

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AI Technical Summary

Benefits of technology

This technology allows us to measure electrical properties accurately without affecting how well an electric conductor's ability to transmit signals or power effectively. By measuring this property instead of just sending it through another path, we can improve our understanding about transmitting data more efficiently.

Problems solved by technology

This patented describes different ways to determine if there're any small or significant differences between two points where electricity flows differently due to potential failures like lightning strikes or power surges caused by overvoltage events (EHS). Different techniques can then be combined together to accurately identify these changes based upon their characteristics. These technical problem addressed in this patent include how to efficiently detect and isolation fault locations without relying heavily on expensive signal processing devices while also minimizing impact on operational cost efficiency and stability metrics.

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