Grounding optimization design method for erecting overhead ground wire on distribution line

Abstract

The invention relates to a grounding optimization design method for erecting an overhead ground wire on a distribution line. The grounding optimization design method comprises the following steps: establishing a distribution line induced thunder overvoltage Agrawal field line coupling model based on a finite difference time domain method; carrying out discrete transformation on the Agrawal field line coupling equation through a time domain finite difference method, and establishing a multi-conductor multi-order inductive thunder overvoltage calculation model; establishing an overhead ground wire model; according to the overhead ground wire model, calculating and comparing the inductive thunder overvoltage of the line without the ground wire and the inductive thunder overvoltage of the line with the ground wire, and obtaining the inductive thunder overvoltage on the phase line by changing the ground conductivity and the grounding resistance parameter of the overhead ground wire; obtaining the induced overvoltage on the insulator through an approximate mode, analyzing the influence relation on the induced overvoltage on the insulator when the ground conductivity and the ground resistance change, and determining whether resistance reduction measures need to be taken on the electric pole or not when the ground conductivity and the ground resistance of the overhead ground wire change is determined; and if the induced overvoltage on the insulator tends to decrease, not taking resistance reduction measures, and enabling natural grounding.

Description

technical field [0001] The present application relates to the technical field of lightning protection for distribution lines, in particular to a grounding optimization design method for erecting overhead ground wires on distribution lines. Background technique [0002] The insulation level of 10kV overhead distribution lines is low, and the failure rate caused by lightning strikes is relatively high. Among them, most of the failures are caused by the lightning-induced overvoltage generated on the wires when the lightning strikes the ground or buildings near the line. Therefore, the line can be effectively reduced. The number of induced overvoltage flashovers is the key to improving its reliability. [0003] As early as the beginning of the last century, some scholars have proposed to erect ground wires in overhead distribution lines to protect against lightning-induced overvoltage. Overvoltage amplitude. In engineering practice, the protective measures of erecting ground w...

AI Technical Summary

Problems solved by technology

[0005] This application provides a grounding optimization design method for erecting overhead ground wires on distribution lines to solve the problem of whether The problem that resistance reduction measures need to be taken for the poles of overhead distribution lines

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