基于拓展峭度的电缆缺陷高分辨率定位方法

随着电缆与电网的高度耦合,电缆故障将辐射影响整个电网及用电设备的安稳运行。传统时域反射分析法往往只能检测并定位电缆已形成的不可逆故障，不能满足检测并提前预防故障的智能检测技术发展趋势及要求。频域反射分析法能够检测到微弱的缺陷，这些缺陷随着时间将演化为不可逆故障。但该方法仍然存在诸如定位图出现误判点，两端出现频闭带，以及定位精度低等缺点。为提高电缆故障检测定位能力，本文结合频域反射分析法与峭度特征量，提出了一种基于拓展峭度的提升缺陷定位能力的方法，可以显著降定位曲线的误判点并且在较宽扫频带宽时能够提升定位精度，最终实现高精度高分辨率的电缆缺陷定位。

High resolution locating method of cable defect based on Extended Kurtosis

With strong coupling between cable and grid, cables fault may affect the whole grid and its devices. Only irreversible fault can be detected via traditional time domain reflectometry, which is opposite to the proactive tendency for intelligent detective methods. What makes it possible to detect weaker fault, the defect, is frequency domain reflectometry which has received more and more attention. These so called defects will deteriorate to irreversible fault with time goes by. However, there are still shortcomings in frequency domain reflectometry, such as the misjudged points, shield band in location diagram, and lower locating accuracy. For improving the capabilities of cable fault detection and location, a new method based on the combination of extended kurtosis and frequency domain reflectometry was proposed in this paper, which can decrease the misjudged point significantly and increase the locating accuracy at higher bandwidth. Then the high accuracy and high distinguishability in locating diagram was implemented.