摘要
转移阻抗和转移导纳是表征外界电磁场对屏蔽电缆耦合机理的两个重要参量。基于传输线理论,提出了一种新的测量屏蔽电缆转移阻抗和转移导纳的简便方法。该方法既可以得到转移阻抗和转移导纳的幅频特性,又可以得到其相频特性,且测试系统比较简单。测试频率范围满足电力系统电磁兼容所关心的频段(0.1MHz～10MHz),对于更高频率屏蔽电缆转移阻抗和转移导纳的测量,可以通过选择更短的电缆样品来实现。为了验证测量方法的正确性,与现有方法的测量结果进行了对比。该测量方法可推广用于多芯屏蔽电缆的转移阻抗和转移导纳测量。
The transfer impedance and transfer admittance are two important parameters for expressing numerically the mechanism that allows the passage of electromagnetic energy across the cable shield. Based on the transmission line theory, a simple method is presented to measure the transfer impedance and transfer admittance of the shielded cable in magnitude as well as in phase over the frequency range （0. 1MHz-10MHz） which covers the main interference frequencies in power system. In order to avoid occurrence of resonance, a shorter cable sample is choosen to carry out the rational results for high frequency measurement. With the proposed method, the test system can be quickly set up and run. A coaxial cable with a braided shield is measured and compared with the existing method, the validity of the method presented in this paper is confirmed. As an extension, the method may be applied to the multi-core shielded cable.
出处
《电波科学学报》
EI
CSCD
北大核心
2007年第4期696-701,共6页
Chinese Journal of Radio Science
基金
国家杰出青年科学基金资助项目(50325723)
关键词
屏蔽电缆
转移阻抗和转移导纳
参数测量
shielded cable, transfer impedance and transfer admittance, parameter measurement
