基于阻抗谱的同轴电力电缆高频传输特性研究  

Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum

作　　者：张丹丹[1] 郑建康[2] 冯南战 黎立 刘翔[2] 苏小婷 褚子平 李少斌 ZHANG Dandan;ZHENG Jiankang;FENG Nanzhan;LI Li;LIU Xiang;SU Xiaoting;ZHU Ziping;LI Shaobin(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science&Technology,Wuhan 430074,China;Xi’an Power Supply Company,State Grid Corporation,Xi’an 710032,China)

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [2]国家电网公司西安供电公司,西安710032

出　　处：《高压电器》2021年第6期18-23,共6页High Voltage Apparatus

基　　金：国网陕西省电力公司科技项目(5226XA17000C)。

摘　　要：电缆的传播常数、特征阻抗、相速度的高频特性表征了电缆的高频传输特性,而准确获取电缆的高频传输特性是电缆故障定位的基础。文中针对现有测试技术的不足,提出了基于电缆阻抗谱的同轴电力电缆高频传输特性获取方法,研究结果表明:在300 kHz~100 MHz频率范围,随着频率的增大,衰减常数和相移系数近似线性增大;相速度随频率的增大略有增加,并趋于稳定值;受测量接线处附加电感和附加电容的影响,特征阻抗的高频特性出现较为严重的畸变。The high frequency characteristics of transmission constant,characteristic impedance,wave velocity and distribution parameters of cables characterize the high frequency transmission characteristics of cables.Accurate acquisition of high frequency transmission characteristics of cable is the basis of cable fault location.In view of the shortcomings of the existing testing technology,a method for obtaining high frequency transmission characteristics of coaxial power cable based on cable impedance spectrum is proposed.The results show that in the frequency range of 300 kHz~100 MHz,with the increase of frequency,the attenuation constant and phase shift coefficient increase linearly.The phase velocity increases slightly with the increase of frequency and tends to be stable.Affected by the additional inductance and capacitance of the measured wiring,the high frequency characteristic of the characteristic impedance is seriously distorted.

关 键 词：同轴电力电缆 阻抗谱 传播常数 相速度 特征阻抗 

分 类 号：TM248.3[一般工业技术—材料科学与工程]