Method for optimally selecting lightning protection measures for power transmission lines on basis of entropy weight processes

Abstract

The invention discloses a method for optimally selecting lightning protection measures for power transmission lines on the basis of entropy weight processes. The method includes collecting informationrequired for computing lightning trip-out rates of the power transmission lines; computing the lightning trip-out rates of each tower of the power transmission lines; combining the lightning trip-outrates with lightning risk grade evaluation and dividing lightning risk grades of the various towers; combining the lightning risk grades with trip-out conditions of the power transmission lines in previous years and determining the towers required to be subjected to lightning protection transformation; building lightning protection measures optimal selection comprehensive analysis models for thetowers; determining evaluation indexes of the lightning protection measures for the towers; classifying shielding failure and back striking trip-out rates of the towers, topography and landform characteristics, structural characteristics of the towers and original insulation levels of the towers; determining weight coefficients by the aid of the entropy weight processes; empowering the evaluationindexes; comprehensively evaluating the lightning protection measures in different types of towers.

Description

Technical field [0001] The invention relates to the field of lightning protection of transmission lines and the field of information theory entropy, in particular to a method for optimizing selection of lightning protection measures based on entropy weight method. Background technique [0002] According to the State Grid Corporation's 2012 overhead transmission line operation report statistics, from 2006 to 2012, lightning trips accounted for 47.6% of the total number of trips on 651,819 km of 110kV and above lines. Therefore, lightning activity is an important factor affecting the safety and stability of the power grid. One of the factors. Many transmission lines inevitably have to pass through areas with heavy lightning, high soil resistivity, and complex terrain. In order to reduce the lightning tripping of transmission lines in these areas, various lightning protection measures must be taken to improve the lightning resistance level of transmission lines. With the shortage o...

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Problems solved by technology

[0003] However, in actual engineering, many areas still adopt extensive lightning protection transformation management methods, regardless of the characteristics of transmission lines and lightning protection measures, and choose a single lightning protection measure for treatment without any difference, making the treatment effect insignificant. The tower needs to be rebuilt, which greatly wastes manpower and material resources

The evaluation model of lightning protection measures has shortcomings such as too much influence of human subjectivity, and the factors considered are not comprehensive enough, so it cannot objectively and reliably evaluate the application effect of lightning protection measures

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