Distributed line fault detection and positioning system and method

Abstract

The invention discloses a distributed line fault detection and positioning system which is mounted at each of a plurality of stations, wherein the system comprises a signal acquisition module, a signal analysis module and a fault positioning module; the signal acquisition module is used for acquiring electromagnetic radiation signals generated by electric arc faults generated by lines in an area to be detected; the signal analysis module is used for analyzing the frequency spectrum characteristics of the collected electromagnetic radiation signals, extracting characteristic parameters, comparing the extracted characteristic parameters with a preset characteristic threshold value respectively, and judging whether an electric arc fault occurs in the line or not; and the fault positioning module is used for determining the position of the electric arc fault based on the time difference of arrival positioning principle when judging that the electric arc fault occurs in the line. The invention discloses a distributed line fault detection and positioning method. According to the invention, the electric arc fault can be effectively detected by using the electromagnetic radiation signals generated by the electric arc fault, and the fault can be accurately positioned.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution lines in electric power systems, in particular to a distributed line fault detection and location system and method. Background technique [0002] The transmission and distribution lines of the power system are an important part of the power grid. With the continuous expansion of the scale of the power grid, especially the medium-voltage overhead lines, there are many branches and complex feeder structures. Therefore, the intelligent fault detection and location of power transmission and distribution lines put forward higher requirements. Timely and accurate positioning of power system faults can greatly improve the safety and stability of power grid operation. The existing transmission and distribution line fault location technology mainly collects electrical quantities such as voltage and current, and performs inversion in combination with the line model. However, th...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a distributed line fault detection and positioning system and method to solve the problem of insufficient effectiveness in the prior art for arc fault positioning of power transmission and distribution lines, low fault identification and positioning accuracy, and high investment costs for monitoring faults. The need for power outage installation brings inconvenience to installation and maintenance