摘要
输电线路电磁环境问题主要由电晕放电引起,而降雨等环境变化会加剧这一现象。该研究通过高速摄像与电晕电流测量同步测量技术,详细分析工频下导线单雨滴电晕全过程。结果表明,导线单雨滴电晕全过程可分为4个阶段,尖端放电与振动破碎放电为主要放电类型,且两种放电的上升时间及半波时间概率密度分布均服从正态分布。随电压升高,尖端放电次数占比先减小后增大,电流脉冲幅值、上升时间、半波时间呈上升趋势;振动破碎放电次数占比先增大后减小,电流脉冲幅值、上升时间呈上升趋势,半波时间呈先上升后下降趋势。雨滴半径的增大对不同放电类型的放电次数和电流脉冲特性也产生一定的影响。该研究为理解雨天输电线路的电晕损耗和可听噪声变化提供新的视角。
The electromagnetic environmental issues of transmission lines are mainly caused by corona discharge,and the environmental changes such as rainfall which may exacerbate this phenomenon.Through the synchronous measurement technique of high-speed photography and corona current measurement,the study has conducted a detailed analysis of the whole process of corona discharge on a single raindrop at power frequency.The results show that the whole process can be divided into four stages,with tip discharge and vibration crushing discharge being the main types of discharge.The rise time and half-wave time of both types of discharge follow a normal distribution in terms of probability density.As the voltage increases,the proportion of tip discharge occurrences first decreases and then increases,with the current pulse amplitude,rise time,and half-wave time all showing an upward trend.The proportion of vibration crushing discharge occurrences first increases and then decreases,with the current pulse amplitude and rise time showing an upward trend;while the half-wave time shows a trend of first increasing and then decreasing.The variation in raindrop radius also exerts a certain influence on the discharge times and current characteristics of different discharge types.This study provides a new perspective for understanding the changes in corona loss and audible noise of transmission lines during rainy weather.
作者
刘钰欣
张波
何金良
LIU Yuxin;ZHANG Bo;HE Jinliang(State Key Laboratory of Power System and Generation Equipment(Department of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第13期5386-5397,I0031,共13页
Proceedings of the CSEE
基金
国家自然科学基金创新研究群体项目(51921005)。
关键词
雨滴
泰勒锥
电晕放电
电晕电流脉冲
输电线路
raindrops
Taylor cone
corona discharge
corona current pulse
transmission line
作者简介
刘钰欣(2000),女,博士研究生,主要从事输电线路电磁环境及空间电荷测量技术研究工作,liuyx22@mails.tsinghua.edu.cn;通信作者:张波(1976),男,博士,教授,博士生导师,主要从事输变电技术、电磁环境技术及电磁场数值计算等方面的研究工作,shizbcn@tsinghua.edu.cn;何金良(1966),男,博士,长江学者特聘教授,IEEEFellow,博士生导师,研究方向为输变电技术、电磁环境技术、纳米电介质材料、传感器及大数据应用等,hejl@tsinghua.edu.cn。
