Distribution line flashover rate improvement algorithm based on electrical geometric model

Abstract

The invention discloses a distribution line flashover rate improvement algorithm based on an electrical geometric model, specific steps of solving the distribution line flashover rate by using the improved algorithm and considering factors such as lightning flashover density, tower shape, soil resistivity, line insulation level and other factors are proposed; the method comprises the following steps: determining line parameters, calculating a thunder-resistant level of direct lightning stroke, calculating equivalent flashover width of the line, and calculating the direct lightning stroke flashover rate and the inductive lightning flashover rate. According to the method, the influence of the lightning current amplitude on the equivalent lightning width of the line is considered based on theelectric geometric model, and the equivalent flashover width of the line is defined, so that the calculation of the distribution line flashover rate is more accurate, and the method has a certain guiding effect on lightning stroke risk assessment and differential lightning protection of the distribution line.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to an improved algorithm for distribution line flashover rate based on an electrical geometric model. Background technique [0002] Distribution lines bear the heavy responsibility of directly distributing power to low-voltage loads. As the last link to connect users and control power quality, the safety and reliability of distribution network operation is the basis for ensuring power quality. As a characteristic parameter of distribution line risk assessment, the flashover rate comprehensively considers the influence of the lightning resistance level of the line, the lightning activity in the area where the line passes, the equivalent lightning width of the line, and the probability distribution of lightning current. The causes of faults such as lightning strike and disconnection can evaluate the risk of faults such as lightning tripping and lightning str...

AI Technical Summary

Problems solved by technology

The lightning width calculation method can be well suited for the transmission line whose conductor height exceeds 60m, but there is a considerable error for the distribution line with a line height of no more than 20m. At the same time, the equivalent lightning width D of the line is It is necessary to improve the algorithm of distribution line flashover rate when the amplitude of lightning current changes.

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