电网技术2024，Vol.48Issue(4)：1762-1769,8.DOI:10.13335/j.1000-3673.pst.2023.0282
频域反射法阻抗匹配技术及其在电缆衰减补偿与相速度计算中的应用
Impedance Matching Technology for Frequency Domain Reflectometry and Its Application in Cable Attenuation Compensation and Phase Velocity Calculation
摘要
Abstract
Frequency domain reflectometry(FDR)is an effective method for the cable insulation condition diagnosis.Focusing on the problem of the impedance mismatching in the field FDR detection,this paper presents an effective FDR impedance matching technology.By introducing the variable series impedance model,combined with the estimated characteristic impedance,the influence of the bifurcated leads on the field FDR test results is effectively removed.Firstly,the cable model was established,and by the use of the principle of multiple refraction and reflection of the traveling waves,the reflection coefficient at the head of cable was deduced,which explained the signal transmission process in the cable.Then,this paper presented an impedance matching method at the head of the cable when the bifurcated lead was existed.Finally,the impedance matching tests were performed on the coaxial cable and the 10 kV power cable,and the validity and accuracy of the method in this paper were verified.The results show that the proposed method is able to effectively solve the problem of impedance mismatching at the head of the cable in the field FDR detection.By using the matched data,the attenuation of the cable is able to be compensated effectively,and the phase velocity of cable be calculated accurately.关键词
电缆/频域反射法/阻抗匹配/衰减补偿/相速度计算Key words
cable/frequency domain reflectometry/impedance matching/attenuation compensation/phase velocity calculation分类
信息技术与安全科学引用本文复制引用
谢敏,李烨,俞骏,钱磊,杨东兴,孙庆明,周凯..频域反射法阻抗匹配技术及其在电缆衰减补偿与相速度计算中的应用[J].电网技术,2024,48(4):1762-1769,8.基金项目
国家自然科学基金项目(52277156) （52277156）
四川省科学技术厅青年科技创新团队项目(2020JDTD0013).Project Supported by National Natural Science Foundation of China(NSFC)(52277156) （2020JDTD0013）
The Young Science and Technology Innovation Team Fund of Sichuan Science and Technology Department Under Grant(2020JDTD0013). （2020JDTD0013）
