频域响应法在电力电缆缺陷定位中的研究综述

Review of Research on Frequency Domain Response Method and Its Application in Defect Location of Power Cables

频域响应法对电缆特征阻抗变化微弱缺陷具有较高的识别灵敏度,在电缆日常运维中得到了初步的应用。首先介绍了频域响应法的基本原理,然后梳理了基于宽频输入阻抗谱和基于首端反射系数谱的频域响应法及其定位改进算法的研究进展。在此基础上总结分析了目前频域响应法在现场应用存在的技术难题,介绍了新型缺陷定位方法时频域反射法在提升电缆缺陷定位灵敏度方面的研究与应用,最后指出了频域响应法未来的扩展研究方向。

The frequency domain response method has been preliminarily applied to the daily maintenance of cables by the virtue of its sensitivity to the weak defect of the characteristic impedance change of cables.This paper firstly briefly introduces the basic principle of the frequency domain response method,and then sorts out the research progresses of the frequency domain response method based on broadband input impedance spectrum and reflection coefficient spectrum and their improved localization algorithms.On this basis,the technical problems existing in the field application of the frequency domain response method are sum⁃marized and analyzed,and the research and application of the new defect localization method time-frequency domain reflection method in improving the sensitivity of cable defect localization are introduced.Finally,the future extension research direction of the frequency domain response method is pointed out.