Method and system for determining serial and parallel connection gaps of overhead power transmission line insulators

Abstract

The invention discloses a method and a system for determining serial and parallel connection gaps of overhead power transmission line insulators, wherein the method comprises the following steps of: determining the structures and the shapes of parallel connection gaps according to thunder impulse discharge characteristics; determining the structures and the shapes of the parallel connection gaps according to electric-field intensity distribution; determining the structures and the shapes of the parallel connection gaps according to power frequency arc motion characteristics; determining the space magnetic-field distribution of the parallel connection gaps according to the structures and the shapes of the parallel connection gaps; building an arc motion model of the parallel connection gaps by adopting an arc segmented model to simulate the motion processes of arc roots and arc columns of power frequency arcs under the actions of a space magnetic field and wind force; emulating the arc motion characteristics generated by various different structures and shapes of the connection parallel gaps by utilizing the arc motion model; and determining the structures and the shapes of the parallel connection gaps according to the influences of various different structures and shapes of the parallel connection gaps on the arc motion processes. The parallel connection gaps take account of both the advantages and the defects between the lightning outage rate of a line and the failure rate of the line.

Description

technical field [0001] The invention relates to the field of lightning protection for transmission lines, and more particularly, to a method and system for determining the series-parallel gap of insulators on overhead transmission lines. Background technique [0002] Lightning protection of overhead transmission lines has always been a subject of great concern to electric power workers. In recent years, lightning faults are still one of the main factors affecting the safe operation of lines. Power frequency continuous current after lightning flashover damages insulators and their fittings, resulting in zero-value insulators and even insulator string outage accidents, which brings great difficulties to the operation and maintenance of transmission lines. [0003] Due to the weak grid structure, poor switching performance, and the large impact of breaking fault current on the grid and equipment in the early days, the operators one-sidedly pursued to reduce the lightning tripp...

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Problems solved by technology

Power frequency continuous current after lightning flashover damages insulators and their fittings, resulting in zero-value insulators ...

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