Method for inhibiting corona discharge and dirt accumulation of direct-current transmission line and dielectric film-coated electrode wire

Abstract

The invention discloses a method for inhibiting corona discharge and dirt accumulation of a direct-current transmission line and a dielectric film-coated electrode wire. The surface of the electrode wire is coated with a dielectric layer; dielectric barrier discharge is formed when corona discharge occurs on the electrode wire; in the discharge process, heteropolar charges are continuously attached and accumulated on the outer surface of the dielectric layer, the directions of an original electric field of the electrode wire and an electric field generated by the heteropolar charges are opposite, the heteropolar charge electric field weakens the original electric field, and corona discharge can be stopped when the intensity of a synthesized electric field is lower than the intensity of a corona inception field; dielectric barrier discharge is formed, so that the electric field intensity around the electrode wire is reduced, corona discharge is inhibited, the charge quantity of space dirt particles is reduced, the electrostatic force for driving the space dirt particles to be charged to sink and accumulate dirt is reduced, and the dirt accumulation is inhibited. The method is beneficial to suppression of corona discharge of the high-voltage direct-current transmission line, reduction of corona loss, improvement of an electromagnetic environment, reduction of accumulated pollution, and reduction of external insulation pollution flashover and equipment breakdown risks.

Description

technical field [0001] The invention proposes a method for suppressing corona discharge and fouling of a direct current transmission line and a dielectric-coated electrode wire, which belong to the fields of corona discharge of direct current transmission lines and electromagnetic environment control and protection. Background technique [0002] DC transmission has the advantages of strong power transmission capacity, low loss, unlimited transmission distance, and asynchronous networking between AC systems on both sides. It has been industrialized in point-to-point and large-capacity power transmission between different regional power grids. Currently, there are ±500kV , ±660kV EHV transmission project, ±800kV, ±1100kV UHV transmission project operation. In recent years, due to the reverse distribution of energy demand and resource endowment in my country, energy demand is mainly concentrated in the economically developed regions in the eastern and central regions, while coa...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of continuous deterioration of corona discharge, continuous increase of corona loss, and continuous deterioration or even exceeding of the electromagnetic environment (ion current density, synthetic field strength, radio interference) existing in the long-term operation of overhead DC transmission lines, in order to reduce the pollution caused by DC pollution reduce the risk of flashover, reduce the damage caused by partial discharge caused by pollution, and reduce the workload of cleaning operation and maintenance. The invention proposes a method for dielectric barrier suppression of corona discharge and pollution

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