Method for analyzing pollution accumulation characteristics of large umbrella skirt composite insulator under different air humidities

Abstract

The invention relates to a Fluent finite element simulation analysis and calculation-based pollution accumulation characteristic analysis method for a large umbrella skirt composite insulator under different air humidities. The Fluent finite element simulation analysis and calculation-based pollution accumulation characteristic analysis method is characterized by comprising the following steps: 1)determining the wind speed of an air flow field, the pollutant particle concentration, the change range of the particle size and the change range of the air humidity according to the meteorological characteristics of a region where a power transmission line is located; 2) establishing a flow field and insulator simulation model; 3) solving the simulation model to calculate the distribution of anair flow field around the insulator; and 4) adding pollutant particles into the air flow field obtained in the step 3), changing the air flow field into a gas-solid coupled two-phase flow model, and continuously solving to analyze the change rule of the collision rate of the pollutant particles and the insulator so as to obtain the pollution accumulation characteristic of the composite insulator.According to the Fluent finite element simulation analysis and calculation-based pollution accumulation characteristic analysis method, a characterization method of the air humidity is analyzed and summarized, and the relative humidity and the absolute humidity are converted according to a representation mode of the humidity in simulation software Fluent, so that a theoretical basis is provided for selection of a control variable air humidity change range.

Description

technical field [0001] The invention relates to a method for analyzing the fouling characteristics of large shed composite insulators under different air humidity, in particular to a method for calculating the fouling characteristics of insulators based on Fluent finite element simulation analysis. Background technique [0002] Insulator pollution flashover, ice flashover, rain flashover, lightning strike and operation shock flashover have caused great harm to the safe operation of the power system. Lightning strike accidents have the largest number of external insulator accidents, but pollution flashover accidents have caused the largest economic losses . Pollution flashover mainly includes four processes: pollution accumulation, moisture, partial discharge arc and arc development until it penetrates the surface of the insulator. Therefore, the premise of pollution flashover is the deposition of pollutants. To explore the deposition process of different insulator pollutants...

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Problems solved by technology

[0008] In the past, the research on the pollution characteristics of insulators mainly considered factors such as wind speed, particle concentration in the air, and particle size. However, with the increase of haze weather, the humidity content in the air also changed greatly. The small droplets in the atmosphere will also have an impact on the existence of particulate matter in the atmosphere. There are relatively few studies on the influence of air humidity on the fouling characteristics of insulators. Therefore, it is necessary to study the analysis methods for the fouling characteristics of insulators under different air humidity

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