【作者】 尤少华；

【导师】 律方成； 刘云鹏；

【作者基本信息】 华北电力大学 ， 高电压与绝缘技术， 2012， 博士

【摘要】 电晕损失是特高压交流输电线路电晕放电效应的重要研究内容之一,电晕损失机理以及我国特高压交流输电线路电晕损失评估的研究具有深远的理论意义和重要的实用价值。本文从导线电晕产生机理出发,建立了电晕笼交流导线电晕损失计算模型,进行了特高压电晕笼交流分裂导线电晕损失、不同海拔下电晕笼交流分裂导线电晕损失研究,并对不同气象条件下特高压交流试验线段电晕损失进行监测分析,对电晕笼分裂导线电晕损失与试验线段电晕损失进行等效对比分析,并且对特高压交流输电工程线路电晕损失进行了综合评估。主要工作如下：从电晕损失机理出发,考虑电晕笼结构交流导线电晕损失计算的复杂性,针对每一面笼壁进行镜像处理,在导线表面各点分别判断起晕,仿真正离子、负离子在电场中的产生、迁移、复合等一系列过程,建立了电晕笼交流导线电晕损失计算模型。针对特高压分裂导线8×LGJ-400/35、8×LGJ-500/35、8×LGJ-630/45在不同分裂间距,以及干燥、人工降雨等条件下进行电晕损失试验,为特高压交流输电线路电晕损失评估奠定了试验数据基础。并且将电晕笼交流导线电晕损失计算模型推广至分裂导线电晕损失计算,进一步验证了计算模型的正确性。采用特高压交流试验基地人工环境气候实验室可移动式电晕笼开展试验研究,首次系统获得19m-4000m海拔高度范围内交流分裂导线在干燥、人工降雨条件下电晕损失试验数据。建立不同海拔高度下电晕笼分裂导线电晕起始电压计算模型。并且在电晕笼交流导线电晕损失计算模型的基础上,引入离子迁移率随海拔高度的变化,对模型进行进一步的拓展和完善,建立了考虑不同海拔高度影响的电晕笼分裂导线电晕损失计算模型,并与试验结果进行对比,验证了计算模型的正确性。应用光纤数字化电晕损失监测系统对特高压交流试验线段电晕损失进行监测,获得我国特高压交流单回试验线段、特高压交流同塔双回试验线段,在不同气象条件下的电晕损失监测结果,为我国特高压交流输电线路电晕损失评估提供了重要参考依据。通过电晕损失等效计算分析,相互佐证了电晕笼及试验线段电晕损失试验结果的有效性,并且对将特高压电晕笼分裂导线电晕损失等效应用至特高压交流输电线路电晕损失评估,提供了重要方法。基于特高压电晕笼分裂导线及特高压交流试验线段电晕损失研究成果,对特高压交流输电工程线路电晕损失进行了综合评估,首次获得我国特高压交流输电线路全年电晕损失能量、平均电晕损失功率、线路最大电晕损失功率关键参数,为我国特高压交流输电线路电晕损失评价提供了重要参考依据。更多还原

【Abstract】 Corona loss is one of the important research contents of UHV AC transmission line corona discharge effect, corona loss mechanism, as well as the study on assessment of UHV AC transmission line corona loss has a far-reaching theoretical significance and an important practical value. Based on the generation mechanism of conductor corona, this paper established the corona loss calculation model of AC conductor in corona cage, researched the corona loss of UHV corona cage AC bundle conductors at different altitudes, and analyzed the corona loss of test line under different meteorological conditions, contrasted corona loss between the bundle conductor in corona cage and test line, and conducted a comprehensive assessment on actual line corona loss of UHV AC transmission project. The main work are as follows:Considering the generation mechanism of conductor corona, and the complexity of the calculation on corona cage AC conductor, on each side of the cage mirror image, this paper judged whether occurred corona at each point on conductor surface, simulated the generation, migration, composite and a series of processes of positive and negative ions in the electric field, established a corona cage AC conductor corona loss calculation model.Conducting an experiment of corona loss in cage for UHV bundle conductors8×LGJ-400/35,8×LGJ-500/35,8×LGJ-630/45in space between different divisions, and under the conditions of dry、artificial rainfall and so on, corona losses for UHV AC transmission line test data basis for assessment. This paper extended the corona cage AC corona loss calculation model to the bundle conductor corona loss calculation, and verified the correctness of the calculation model further.A removable corona cage in artificial environment laboratory at the UHV AC Test Base, is adopted to research AC conductor corona. This paper obtained the test data of corona loss under the conditions of dry, artificial rainfall within19m-4000m altitude range. The corona inception voltage calculation model of bundle conductor in corona cage at different altitude was established. And based on this model, considering ion mobility changes with altitude, this paper expanded and improved the corona loss calculation model further, established a model that considering the influence of different altitude, and compared with experimental results, so as to verify the correctness of the calculation model.The optical fiber digital corona loss monitoring system was applied to monitor the corona loss of the UHV AC test line. This paper obtained the corona loss mornitoring results of UHV AC single test line and UHV AC in the same tower double circuits test line in different weather conditions. The results provided important reference to UHV AC transmission lines corona loss assessment. Through the analysis, the approximate linear relationship between different rainfall rate logarithm and corona loss logarithm was found for UHV transmission lines. Using corona loss equivalence calculation and analysis, corona loss test results of corona cage and test line were effective, and this provided an important method to apply UHV corona cage bundle conductors’corona loss equivalence to UHV AC transmission line corona loss assessment.Based on the corona loss research of the UHV corona cage bundle conductors and UHV AC test line, corona loss of UHV AC transmission project transmission lines were assessed, and the UHV AC transmission line corona loss assessments of our country were obtained, including transmission line’s corona loss in one year, annual average corona loss power, the maximum corona loss power key parameters, and this provides important reference for China’s UHV AC transmission line corona loss evaluation.更多还原