台风风雨载荷作用下输电线路绝缘子串风偏特性  

Windage characteristic analysis of transmission lines under typhoon-rain loads

作　　者：吴河江 黄仁谋 安利强[2] 张荣伦 程传玲 梁亚峰 张志强 HUANG Ren-mou;AN Li-qiang;ZHANG Rong-lun;CHENG Chuan-ling;LIANG Ya-feng;ZHANG Zhi-qiang(Hainan Electric Power Research Institute,Haikou 570125,China;Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]海南电力技术研究院,海南海口570125 [2]华北电力大学机械工程系,河北保定071003

出　　处：《电力科学与技术学报》2018年第2期89-95,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51675179);中国南方电网有限责任公司科技项目(078000KK521G0007)

摘　　要：台风天气常伴随强降雨,风雨载荷极易导致输电线路发生风偏闪络故障,严重影响电网的运行安全和供电系统的可靠性,研究雨载荷作用下输电线路绝缘子串的风偏特性具有重要意义。综合考虑雨载荷的影响,采用模拟圆方法,进行台风关键参数概率分布研究。基于Yanmeng台风风场模型,计算海口市极致风速,采用沅台风风谱模拟台风的脉动风速,计算不同降雨条件下的雨载荷。并通过在ANSYS中建立一塔两线输电线路模型,进行台风风雨载荷作用下绝缘子串风偏的分析。仿真结果表明,在强台风天气下,考虑雨载荷后,绝缘子串的风偏角会明显增大,在极值大暴雨条件下,这种放大作用将会达到13.3%,雨载荷对电气间隙放大效应可达到14.8%。因而在沿海地区输电线路风偏校验中考虑雨载荷的影响,并适当加大横担长度加强绝缘,可显著减小风偏闪络故障率。The typhoon is often accompanied by heavy rain. In that case, wind and rain loads might lead to a windage flashover, which seriously affect the operation safety of power grid and the reliability of power supply system. It is of great significance to study the windage characteristics of insulator string in transmission lines under rain loads. Considering the impact of rain loads, the probability distribution of typhoon key parameters is studied by using the simulation circle method. The rain load under different raindrops intensity is calculated based on the Yanmeng typhoon filed which is utilized to calculate the extreme wind speed in Haikou City While the fluctuating wind of typhoon is simulated by Shiyuan typhoon spectrum. Besides, a one tower and two-span conductors model is established in ANSYS to analyze the windage characteristics under the typhoon wind-rain load. The simulation results show that the windage flashover failure of transmission line happens easily under typhoon and the windage yaw of insulator string increases remarkably when the rain load is considered. Furthermore, the amplification effect is up to 13.3% and the amplification effect of rain load on electric clearance reaches 14.8% under the condition of extreme rainstorm. It is concluded that the flash failure rate of wind deflection is significantly reduced by considering the impact of rain load on the windage of transmission line, and appropriately increasing the length of cross arm to strengthen the insulation

关 键 词：台风 塔线体系 极值风速 风雨载荷 风偏角 

分 类 号：TM75[电气工程—电力系统及自动化]