Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch

Abstract

The invention belongs to the technical field of ultra-high voltage power transmission, in particular to a method for improving the converted current switching capability of an ultra-high voltage open alternating current isolating switch. Auxiliary circuits are added on a main contact to switch converted current, and isolating switches are used to guide the operation of electric poles, so that the converted current switching capability of the isolating switches can be greatly improved, and the use requirements for connecting the isolating switches in parallel can be met. Thus, by using the method, the converted current switching capability is greatly improved, the requirements for connecting the isolating switches in parallel are easily met, the influence of electric arcs is almost completely eliminated, the operation and the control of the isolating switches are greatly simplified, the cost is lowered and the reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of UHV power transmission, and in particular relates to a method for improving the switching current switching capability of an UHV open-type AC isolating switch. Background technique [0002] In order to improve the transmission capacity of UHV transmission lines and improve system stability, it is necessary to install UHV series compensation devices on the line. Parallel isolating switches are used to switch the operation mode of series compensation devices. They are important operating equipment and usually use open AC isolating switch. Parallel isolating switches for UHV series compensation require switching current switching capability to meet switching current 6300A and switching voltage 6000V. According to the current standard, the maximum parameters of switching current switching capacity of conventional isolating switches are 1600A switching current and 400V switching voltage, which cannot directly...

AI Technical Summary

Problems solved by technology

[0005] The arc is extinguished by elongating the air arc, the breaking capacity is very limited, and it is greatly affected by the environmental conditions;

[0006] ●Severe open air arc will be generated, and its ablation and diffusion will seriously affect the safe operation of switchgear and its surrounding equipment

[0007] ●Improving the opening and closing ability is limited, and can only meet the highest parameters stipulated in the existing standards: conversion current 1600A, conversion voltage 400V, which cannot meet the conversion current switching requirements of parallel isolation switches with conversion current 6300A and conversion voltage 6000V

Images