Power transmission line lightning stroke type identification method

Abstract

The invention provides a power transmission line lightning stroke type identification method and belongs to the technical field of electricity when divided according to international patent classification (IPC). The method is mainly to solve the problems of large measurement errors and inaccurate identification results due to the dependence on a conventional thunder positioning experience identification method, and provides new basic data support for the development of the lightning protection work of power transmission lines. The method is characterized by utilizing a monitoring terminal to obtain current traveling waves on wires of the power transmission lines at the moment of lightning stroke, deeply delving and analyzing electromagnetic transient characteristics of the current traveling waves, analyzing wave tail time of the current traveling waves, Fourier frequency spectrum, and probability distribution of the frequency, and finally, realizing accurate identification of the lightning stroke types. The method can realize accurate distinguishing of lightning conductor or tower lightning stroke, wire lightning stroke and inductive thunder, so that the lightning stroke monitoring is carried out from the wide-range line corridors specifically to line bodies or the sides of the lines, and development of differentiated lightning protection work can be directed favorably; and besides, compared with other thunder activity monitoring devices, the measurement device is low in cost and easy to install and maintain, and greatly reduces lightning stroke monitoring cost.

Description

technical field [0001] The invention relates to the field of intelligent diagnosis of transmission line faults in power systems, in particular to the field of lightning strike type identification for transmission lines. Background technique [0002] With the development of power systems, the height and transmission capacity of overhead transmission lines are constantly increasing. Overhead transmission lines stretch for thousands of kilometers, and are often attacked by various lightning overvoltages, causing power outages. According to the classification and statistics of power grid faults, the proportion of tripping faults caused by lightning strikes is as high as 40% to 70%. Therefore, research on lightning overvoltage protection for overhead transmission lines is an important topic that must be studied in the construction of ultra-high voltage power grids and smart grids. The lightning overvoltage of transmission lines can be divided into induced lightning overvoltage, ...

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Problems solved by technology

[0004] The purpose of the method of the present invention is to propose a method based on the electromagnetic transient characteristics of the current traveling wave on the wire at the time of the lightning strike of the transmission line to realize the identification of the lightning strike type of the transmission line, in order to solve the traditional identification method that relies on lightning location experience. large and inaccurate identification results, providing new basic data support for the development of lightning protection work on transmission lines

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