發(fā)布時(shí)間：2018-01-08 09:09

  本文關(guān)鍵詞：復(fù)合絕緣子污閃局部電弧微觀發(fā)展及影響因素研究　出處：《沈陽(yáng)工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 復(fù)合絕緣子 局部電弧 微觀參數(shù) 干區(qū) 鞘層

【摘要】：復(fù)合絕緣子因其重量輕、耐污閃性能優(yōu)越在電力傳輸中得到廣泛應(yīng)用。但在高海拔地區(qū)和環(huán)境嚴(yán)重污染地帶,復(fù)合絕緣子表面也易積污形成導(dǎo)電污層,泄漏電流熱效應(yīng)使其表面形成干區(qū)發(fā)生沿面放電或產(chǎn)生局部電弧,局部電弧的發(fā)展至閃絡(luò)會(huì)造成電網(wǎng)電力系統(tǒng)事故。因此對(duì)復(fù)合絕緣子污閃局部電弧的形成及其發(fā)展的研究具有重要意義。本文以FZSW-10/4型號(hào)支柱復(fù)合絕緣子為研究對(duì)象,基于等值鹽密法對(duì)絕緣子進(jìn)行人工污穢試驗(yàn),測(cè)量了起暈電壓和閃絡(luò)電壓,并拍攝了局部電弧形成至完全閃絡(luò)的全過(guò)程,作為宏觀仿真初始條件。建立了絕緣子表面干區(qū)和剩余污層串聯(lián)的二維電場(chǎng)仿真模型,對(duì)比分析了絕緣子表面不同污穢分布狀況、不同污層鹽密電導(dǎo)率對(duì)復(fù)合絕緣子局部電位、電場(chǎng)分布的影響,作為微觀仿真模型的初始條件。依據(jù)試驗(yàn)觀察到的局部電弧的產(chǎn)生位置及宏觀電場(chǎng)、電位的仿真結(jié)果,基于奧本斯諾污閃放電模型,及Boltzmann電子飄逸擴(kuò)散方程、Maxwell-Stefan重物質(zhì)輸運(yùn)方程和泊松方程建立了污閃局部電弧微觀仿真模型,考慮了電子碰撞電離、激發(fā)、彈性碰撞、吸附、中性粒子間碰撞等43種反應(yīng)方程,從微觀粒子運(yùn)動(dòng)的角度揭示局部電弧的形成機(jī)理,并對(duì)比分析了污層鹽密、干區(qū)溫度、干區(qū)長(zhǎng)度、干區(qū)初始電子密度等因素對(duì)污閃局部電弧微觀參數(shù)的影響。研究結(jié)果給出了FZSW-10/4型號(hào)復(fù)合絕緣子的起暈電壓、閃絡(luò)電壓與等值鹽密滿足的冪函數(shù)規(guī)律及局部電弧的產(chǎn)生位置;傘裙表面不同污穢分布狀況、污層電導(dǎo)率對(duì)局部電場(chǎng)、電位的影響;污層鹽密、干區(qū)溫度、干區(qū)長(zhǎng)度與局部電弧鞘層場(chǎng)強(qiáng)及弧柱區(qū)微觀參數(shù)的關(guān)系。為復(fù)合絕緣子污閃局部電弧的微觀發(fā)展提供了理論依據(jù)。
[Abstract]:Composite insulators are widely used in electric power transmission because of their light weight and excellent flashover resistance. However, in high-altitude areas and seriously polluted areas, the surface of composite insulators is prone to fouling to form a conductive layer. The thermal effect of leakage current results in the formation of surface discharge or partial arc in the dry area of the surface. The development of local arc to flashover will result in power system accident. Therefore, it is of great significance to study the formation and development of local arc of composite insulator pollution flashover. In this paper, the FZSW-10/4 model pillar is used for the study of the formation and development of local arc. The insulator is the object of study. Based on the method of equivalent salt density, the artificial contamination test of insulator was carried out. The corona initiation voltage and flashover voltage were measured, and the whole process of local arc forming to full flashover was photographed. As the initial condition of macroscopical simulation, a two-dimensional electric field simulation model of the dry zone of insulator surface and the series of residual pollution layer is established, and the distribution of different contamination on insulator surface is compared and analyzed. The influence of different salt density conductivity on local potential and electric field distribution of composite insulator is taken as the initial condition of microscopic simulation model. The location of local arc and the macroscopic electric field are observed according to the experimental results. The simulation results of the potential are based on the Auburn Snow flashover model and the Boltzmann electron transport diffusion equation. The microscopic simulation model of local arc in pollution flashover is established by Maxwell-Stefan heavy matter transport equation and Poisson equation. The electron collision ionization, excitation, elastic collision and adsorption are considered. The formation mechanism of local arc is revealed from the point of view of the motion of microparticles, and the salt density, dry zone temperature and dry zone length are compared and analyzed. The effect of the initial electron density of dry zone on the microcosmic parameters of local arc in pollution flashover is studied. The corona initiation voltage of FZSW-10/4 composite insulator is given. The law of power function of flashover voltage and equivalent salt density and the location of local arc; Different contamination distribution on the surface of umbrella skirt, and the influence of fouling layer conductivity on local electric field and potential; The relationship between salt density, dry zone temperature, dry zone length and local arc sheath field strength and microcosmic parameters of arc column region provides a theoretical basis for the micro development of local arc flashover of composite insulator.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM216

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李亞偉;楊昊;張喬根;周軍;于昕哲;;基于上下表面電弧特性的交流絕緣子污穢閃絡(luò)電壓計(jì)算[J];中國(guó)電機(jī)工程學(xué)報(bào);2014年30期

2 張盈利;汪l，

本文編號(hào)：1396475