Method for evaluating and calculating lightning protection measure of line for reducing lightning strike risk

Abstract

The invention relates to method for evaluating and calculating a lightning protection measure of a line for reducing a lightning strike risk. The method comprises the following steps: firstly, defining a probability that a tower relatively easily subjected to lightning strike and a probability of a dangerous current at this section; considering impact factors of various lightning protection measures on the lightning risk of a specific voltage class line; orderly defining economic impact index values of the various lightning protection measures on the overall transformation of the specific voltage class line; and finally, obtaining a lightning strike risk value of the specific voltage class line. The invention provides the comprehensive evaluation and calculation method of the lightning protection measure for reducing the lightning strike risk of a power transmission line, so as to provide a certain reference for the improvement of lightning protection of the power transmission line to some extent.

Description

technical field [0001] The invention relates to the field of lightning protection, in particular to an evaluation and calculation method for reducing the risk of lightning strike by lightning protection measures for lines. Background technique [0002] The transmission line is the main artery of the power system, and its safe operation directly affects the stability of the power grid and the reliable power supply to users. The environment of high-voltage transmission lines is relatively harsh, and lightning strikes often cause line trips, and some even cause permanent faults on the lines to fail to reclose, endangering the safety and stability of the system. [0003] At present, some lightning protection measures commonly used on transmission lines mainly include: reducing the grounding resistance of towers, installing line arresters, strengthening insulation levels, erecting coupling ground wires, changing protection angles, and so on. At present, the actual application ef...

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Problems solved by technology

[0009] Method 1: The disadvantage is that the measures are too simplistic, and the effect of the lightning protection measures cannot be reflected after the transformation of a single lightning protection measure is considered alone, and the optimal value obtained through calculation is often impossible to achieve in reality

[0010] Method 2: Although differentiated lightning protection measures can solve the problems existing in extensive lightning protection transformation, at present, this method only focuses on providing reference for the lightning protection scheme of transmission lines, which is based on the lightning resistance level of the line, the erection method, and the pole tower. There are different lightning protection strategies proposed based on the tower type, the lightning environment, the size of the protection angle, etc., and there is no qualitative or quantitative measurement of how to comprehensively evaluate the lightning protection measures given.

[0011] Method 3: Although this method has certain practicability, there are problems such as inconsistency in AHP, strong subjectivity of expert assessment of lightning protection measures, and cumbersome calculations.

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