Electric power line lightning protection performance estimation method based on thunder and lightning parametric statistics

Abstract

The invention relates to a method for evaluating the lightning protection performance of transmission lines based on the parametric statistics of lightning. The method comprises the following basic steps: firstly, the information of the transmission lines which require the lightning protection performance evaluation is given; secondly, the ground flash density and the probability distribution statistics of the lightning current magnitude within a specified period are performed to the given transmission lines; thirdly, the lightning-stroke trip-out rate in each section of the transmission lines segmented according to a pole tower within the specified period is calculated; fourthly, a reference value is set according to a design value, a specified value or an operation experience value of the lightning-stroke trip-out rate, and the time difference and the space difference of the lightning protection performance of the transmission lines are evaluated according to the lightning-stroke trip-out rate of each section of the transmission lines and a whole line within the specified period, wherein the lightning-stroke trip-out rate is obtained through the calculation in the step three. The method has the advantages that the evaluation to the lightning protection performance of the transmission lines is performed on the basis of the parametric statistics of lightning with time and space differences; the evaluation result of the method to the lightning protection performance of the transmission lines is more reliable, and has more pertinence; and the evaluation to the lightning protection performance of the transmission lines on different times and different spaces is realized.

Description

technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a lightning protection performance evaluation method for transmission lines based on lightning parameter statistics, which is suitable for lightning protection performance evaluation of high-voltage, ultra-high voltage and extra-high voltage overhead transmission lines in power systems. Background technique [0002] At present, lightning accidents in the power grid are becoming more and more serious, and have become the first major factor threatening the safe and stable operation of the power grid besides natural disasters. The lightning protection performance evaluation of transmission lines has been highly valued by power grid operators. As far as the applicant knows, the lightning protection performance evaluation of transmission lines is an important technical means to guide the lightning protection design of transmission lines, master the lightning protection pe...

AI Technical Summary

Problems solved by technology

This method is proposed to overcome the inability of the transmission line lightning protection judgment method to carry out full line simulation and the lack of multi-parameter optimization.

Its shortcomings are that it does not take into account the temporal and spatial differentiation characteristics of each lightning parameter, cannot evaluate the substantial difference in the lightning protection performance of transmission lines in time, and cannot reflect the lightning protection performance of each tower due to different lightning parameters. s difference

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