Overhead distribution line lightning damage risk assessment method based on electrical geometric model

Abstract

The invention discloses an overhead distribution line lightning damage risk assessment method based on an electrical geometric model. The method comprises the following steps: 1) judging alightning stroke position; 2) calculating lightning stroke overvoltage; 3) calculating a lightning trip-out rate; 4) assessing the lightning damage risk level; the method comprises the steps of 1) establishing aposition judgment model, according to the lightning stroke location, calssfying the lightning stroke fault types, calculating the lightning stroke overvoltage; 2) establishing a lightning stroke overvoltage calculation model and judging whether the lightning stroke can cause line flashover or not; 3) establishing a lightning stroke trip-out rate calculation method under the premise of consideringmulti-phase flashover; and 4) establishing a lightning damage risk level evaluation method comprehensively considering direct lightning and induced lightning. According to the method, a set of systematic overhead distribution line lightning damage risk assessment process is established, and a basic assessment basis can be provided for overhead distribution line lightning protection design and operation and maintenance.

Description

technical field [0001] The invention relates to the technical field of lightning protection for overhead power distribution lines in electric power systems, in particular to a lightning risk assessment method for overhead power distribution lines based on an electrical geometric model. Background technique [0002] Compared with traditional high-voltage transmission line lightning protection, distribution network line lightning protection has significant differences and technical characteristics. High-voltage transmission lines (voltage level above 110kV) are generally iron tower structures. Lightning protection lines are erected on the lines, and special grounding grids are laid under the foundation of the iron towers to connect with the iron towers. counterattack lightning), the lightning strike part is generally the lightning protection line or the top of the tower, and the distribution network line is only required to be erected with lightning protection lines 1-2 kilome...

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Problems solved by technology

[0006] The patents or methods disclosed above, including other disclosed lightning hazard risk assessment methods, are relatively lacking in the accurate calculation of lightning tripping rate and the application of actual lightning parameters, which will bring deviations to the lightning protection management work of distribution network lines

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