屏蔽电缆转移阻抗的5平行线测试方法  

Five-parallel-line Measurement Method for the Transfer Impedance in Shielded Cables

作　　者：石立华[1] 张刘辉[1,2] 张祥[1] 周颖慧[1] 

机构地区：[1]解放军理工大学电磁环境效应与电光工程国家级重点实验室 [2]中国人民解放军73911部队

出　　处：《高电压技术》2013年第12期2869-2875,共7页High Voltage Engineering

基　　金：国家自然科学基金(51077133)~~

摘　　要：摘要：为了研究屏蔽电缆的电磁脉冲耦合效应，提出了屏蔽电缆转移阻抗时域测试的一种新方法。建立了时域测量系统，该系统由高压脉冲源、5平行线测试装置、数字存储示波器以及同轴衰减器组成，通过时域测量获得了电缆的表面转移阻抗，并由测试结果直接获得SYV-50—5型同轴电缆的双指数波脉冲峰值屏蔽效能为74．8641dB。与3同轴法频域测试比较，2种测试方法在频率1～100MHz获得SYV-50—5型同轴电缆的转移阻抗曲线一致，验证了所提出方法准确性，且研制的可调间隙的5平行线测试装置不需要重复考虑外电路的匹配问题，简化了实验程序。最后通过参数化建模确定了测试系统的转移阻抗传递函数，便于该系统在时域分析计算中的应用。In order to study the electromagnetic pulse coupling effects of shielded cables, we proposed a system for measuring the transfer impedance of the cables in time domain. The system comprises a high voltage pulse source, a five-parallel-line measurement device, a digital oscilloscope, and a coaxial attenuator. Using the system, we obtained the coupled voltage and current of shielded cables, and obtained the peak shielding effectiveness of SYV-50- 5 coaxial cable to be 74. 864 1 dB. Comparing the proposed system with triaxial method, we found that the curves of transfer impedance of SYV-50-5 coaxial cable obtained by the two method were consistent in the frequency range of 1- 100 MHz, verifying the accuracy of the proposed system; meanwhile, compared with triaxial devices, the developed five-parallel-line device does not need to consider an external matching circuit, and this simplifies the experiment procedure. To make the proposed method convenient in practical time domain analyses, the transfer function of transfer impedance for the system is also obtained through the parametrically model-establishing method.

关 键 词：电磁脉冲 耦合效应 屏蔽电缆 3同轴法 时域测试 转移阻抗 参数化建模 

分 类 号：TM75[电气工程—电力系统及自动化]