摘要
针对超特高压输电线路等电位带电作业电位转移电弧电磁辐射问题,提出基于分形天线的电磁辐射特性测量方法;设计了性能满足检测要求的4阶Hilbert天线,搭建了输电线路带电作业电位转移电弧模拟试验平台,分析了电位转移电流、电磁辐射信号的变化规律,并获得了电磁辐射信号的频谱特性,同时,考虑了转移电弧特性对其电磁辐射频带的影响。结果表明:导线电压增大时,转移电流脉冲数量和峰值均明显增大;电磁辐射脉冲的变化规律与转移电流脉冲一致,均呈衰减振荡,振荡时间约为1μs;转移电弧电磁辐射信号主要分布在频段10~30 MHz,且频域峰值主要集中在14 MHz附近;转移电弧特性对其电磁辐射频谱分布的影响较小;研究可为智能设备的电磁屏蔽措施奠定基础。
Aiming at the electromagnetic radiation problem of the potential transfer arc due to equipotential live working in ultra-high voltage transmission lines, a measurement method of electromagnetic radiation characteristics based on fractal antenna is proposed. A fourth-order Hilbert antenna with performance meeting the detection requirements was designed, and the potential transfer arc simulation test platform for live working of transmission lines was built. The variations of transfer current and electromagnetic radiation signal were analyzed, and the spectrum characteristics of electromagnetic radiation signal were obtained. At the same time, the influence of the potential transfer arc characteristics on its electromagnetic radiation spectrum distribution was considered. The results show that when the conductor voltage is increased, the numbers and the peak of transfer current pulse are increased significantly. The variation of electromagnetic radiation pulse is consistent with that of transfer current pulse, both of which show attenuation oscillation, and the oscillation time is about 1 μs. The electromagnetic radiation signal of transfer arc is mainly distributed in the frequency band of 10~30 MHz, and the peak in frequency domain is mainly concentrated near 14 MHz. The characteristics of potential transfer arc have little effect on the spectrum distribution of electromagnetic radiation, which can lay a foundation for the research of electromagnetic shielding measures of intelligent equipment.
作者
黎鹏
蒋建红
吴泳聪
吴田
方春华
普子恒
LI Peng;JIANG Jian-hong;WU Yong-cong;WU Tian;FANG Chun-hua;PU Zi-heng(Hubei Provincial Engineering Technology Research Center for Power Transmission Line,China Three Gorges University,Yichang 443002,China;College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China;Electric Power Research Institute,China Southern Power Grid,Guangzhou 510080,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2022年第6期53-61,共9页
Electric Machines and Control
基金
国家自然科学基金(51807110)
电网环境保护国家重点实验室开放基金项目资助(GYW51201901076)。
关键词
带电作业
电位转移电弧
电磁辐射
转移电流
Hilbert天线
频谱分布
live working
potential transfer arc
electromagnetic radiation
transfer current
Hilbert antenna
spectrum distribution
