不同海拔高度交流电晕电流脉冲特性实验研究  

Experimental research on the characteristics of AC corona current pulse at different altitudes

作　　者：刘永聪 何旺龄 刘兴发 何泽宇 蓝磊[1] 鲁海亮[1] LIU Yongcong;HE Wangling;LIU Xingfa;HE Zeyu;LAN Lei;LU Hailiang(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;Department of Electrical Engineering,North China Electric Power University,Baoding 071003,Hebei,China;State Key Laboratory of Power Grid Environmental Protection,Wuhan 430000,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]华北电力大学电力工程系,河北保定071003 [3]电网环境保护国家重点实验室,武汉430000

出　　处：《电测与仪表》2024年第2期41-48,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51507119)。

摘　　要：不同海拔高度下交流电晕特性的变化规律是高海拔地区线路设计的基础。文章利用可移动式小电晕笼和高频电流测量系统在20 m~4320 m范围内的5个海拔高度点进行实验,采集了1 mm直径细铜丝在不同施加电压下的电晕电流脉冲、无线电干扰和可听噪声水平数据;通过对实测数据的统计分析及拟合,得到了海拔高度对电晕电流脉冲特性的影响规律,并分析了不同海拔高度下电晕电流同无线电干扰和可听噪声水平的关联关系。研究表明,随着海拔高度增加,交流电晕电流脉冲的幅值增大,幅值概率分布逐渐分散,一个周期内交流电晕电流脉冲的数量增加,脉冲形成时间变得更加均匀;将电晕电流有效值作为中间变量,研究海拔高度对交流线路电晕效应的影响,得到电晕电流有效值与导线施加电压呈线性函数关系,该线性函数的斜率k、截距b均为海拔高度h的三次函数;无线电干扰和可听噪声水平均与电晕电流有效值呈对数增长关系,其中可听噪声与电流有效值的函数关系随海拔高度变化而改变。The changing law of AC corona characteristics at different altitudes is the basis of line design in high altitude areas.This paper uses a movable small corona cage and a high-frequency current measurement system to conduct experiments at 5 altitude points within the range of 20 m~4320 m,and collects the corona current pulse,radio interference and audible noise level data of 1mm diameter thin copper wire under different applied voltages.And through statistical analysis and fitting of the measured data,the effect of altitude on the corona current pulse characteristics and the relationship between corona current and radio interference and audible noise level at different altitudes are obtained.Studies have shown that as the altitude increases,the amplitude of the AC corona current pulse increases,and the probability distribution of the amplitude gradually disperses.The number of AC corona current pulses in a cycle increases,and the pulse formation time becomes more uniform.By the RMS of corona current regarded as an intermediate variable,the influence of altitude on the corona effect of AC lines is studied,and the RMS of corona current is linearly related to the applied voltage of the wire.And the slope k and intercept b of this linear function are both cubic functions of altitude h.The radio interference and audible noise level has a logarithmic growth relationship with the RMS of the corona current,and the functional relationship between the audible noise and the RMS of the current changes with altitude.

关 键 词：电磁环境 海拔高度 交流电晕特性 小电晕笼 电晕电流脉冲 

分 类 号：TM72[电气工程—电力系统及自动化]