摘要详情

ID / 提交时间

36 / 2023-09-27 10:48:59

标题

A New Method for Defect localization of Cable Based on Pisarenko Harmonic Decomposition

关键字

reflection coefficient spectrum; Pisarenko harmonic decomposition; defect localization; frequency domain reflectometry

主题及专题

4.High voltage and insulation technology > (4)、Other topics in high voltage and insulation technology

状态

终稿

作者

Jie Feng / Sichuan Shuneng electric Energy Technology Co., LTD；State Grid Sichuan Electric Power Company electric power Science Research Institute

Daxing Wang / Sichuan Shuneng electric Energy Technology Co., LTD；State Grid Sichuan Electric Power Company electric power Science Research Institute

Xinghong Zhao / Sichuan Shuneng electric Energy Technology Co., LTD

摘要

Frequency domain reflectometry (FDR) has been widely used for defect detection in cables. However, the reflection coefficient spectrum is a non-periodic random signal, which leads to spectral leakage during the FFT process. Therefore, it is necessary for the staff to add window functions manually with experience to reduce the influence of spectral leakage on defect localization. In this paper, a new method of cable defect localization based on Pisarenko harmonic decomposition is proposed, which uses a linear difference model to fit the distribution of the reflection coefficient spectrum. Then, in order to estimate the frequency of each component, an auto-regression-moving average (ARMA) prediction model is built. Finally, the defects localization is completed by estimated the parameters of the ARMA model. The feasibility of the proposed method is verified through the simulation of the cable model with defects.