A Segment Insulation Diagnosis Method of Power Cable Based on Attenuation Coefficient in Frequency Domain

IF 2.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-16 DOI:10.1109/TDEI.2024.3461680

Zhirong Tang;Kai Zhou;Yefei Xu;Pengfei Meng;Yuan Li;Hongzhou Zhang;Kuangyi Jiang

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引用次数: 0

Abstract

In recent years, the frequency domain reflection (FDR) method has been widely used in power cable defect location detection. However, the FDR method only diagnoses the change of insulation state at the defect and ignores that of the cable body. Thus, based on the mathematical model of the reflected wave of the power cable, a method to diagnose the insulation state of each segment of the power cable by using the attenuation coefficient is proposed in this article. In the method, the reflection coefficient spectrum (RCS) of a power cable and the location of defects are obtained by the traditional FDR method, and the power cable is divided into several segments based on the location of defects. Then, the two-point interpolation fast Fourier transform (I2pFFT) algorithm is used to estimate the attenuation coefficient of each segment in the RCS. Theoretically, the value of the attenuation coefficient is a characteristic of the change of the dielectric constant of the cable, thus the insulation state of the power cable can be diagnosed by attenuation coefficient. Finally, the feasibility and validity of the proposed method are verified by simulation and field 2 km/27.5 kV cable, respectively. The experimental results show that the proposed method can effectively diagnose the insulation state of each segment of the power cable.

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基于频域衰减系数的电力电缆分段绝缘诊断方法

近年来，频域反射（FDR）方法在电力电缆缺陷定位检测中得到了广泛的应用。然而，FDR方法仅诊断缺陷处绝缘状态的变化，而忽略了电缆体的绝缘状态变化。因此，本文基于电力电缆反射波的数学模型，提出了一种利用衰减系数来诊断电力电缆各段绝缘状态的方法。该方法通过传统的FDR方法获得电力电缆的反射系数谱（RCS）和缺陷位置，并根据缺陷位置将电力电缆分成若干段。然后，采用两点插值快速傅立叶变换（I2pFFT）算法估计RCS中各段的衰减系数；从理论上讲，衰减系数的取值是电缆介电常数变化的一个特征，因此可以通过衰减系数来诊断电力电缆的绝缘状态。最后，分别通过2 km/27.5 kV电缆的仿真和现场实测验证了所提方法的可行性和有效性。实验结果表明，该方法能有效地诊断电力电缆各段的绝缘状态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.