Long air gap discharge stream initial time delay analysis method under positive polarity operation impact

Abstract

The invention discloses a long air gap discharge stream initial time delay analysis method under positive polarity operation impact, which comprises the following steps: S110, building a photoelectric combined observation platform, carrying out a long air gap discharge test under positive polarity operation impact, obtaining long air gap discharge optical and electrical characteristic parameters under positive polarity operation impact, and forming a research sample set; S120, performing time node alignment on the collected research sample set, and drawing optical power, space electric field and electrode applied voltage change oscillogram in the long-gap discharge process under the same time scale; S130, establishing a photoionization stream starting criterion; S140, dividing the start time delay of the stream into two parts, namely boosting time delay and effective electronic statistical time delay; S150, generating a free electron generation frequency formula in the critical volume; and S160, analyzing the influence rule of the air pressure on the negative ion density, the negative ion service life and the critical volume growth rate. According to the method, the defects in the prior art can be overcome, and the influence rule of different altitudes on the initial time delay of the long-air-gap discharge stream is disclosed.

Description

technical field [0001] The invention relates to the technical field of observation and analysis of long air gap discharge, in particular to a method for analyzing the initial time delay of long air gap discharge current injection under the impact of positive polarity operation. Background technique [0002] In recent years, with the gradual increase of my country's energy development in the central and western regions, UHV AC and DC power transmission projects have become the main way of electric energy transmission, and many of them are located at an altitude of more than 4000m. As the altitude increases, the decrease in air density will lead to a decrease in the insulation strength of the air gap. The actual operation experience of the power grid shows that low air pressure has a significant impact on the insulation characteristics of electrical equipment. If the design is improper, it will cause accidents. Therefore, high altitude and low air pressure conditions The long-...

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Problems solved by technology

Existing studies on high-altitude long-gap discharge mainly focus on macroscopic characteristics such as breakdown voltage and effective gap distance. The empirical formula obtained by summarizing experimental data under specific conditions has certain engineering guiding significance, but it is still necessary to further explore low-pressure conditions. The laws of physical characteristics of long gap discharge

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