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Online condition monitoring of surge arresters based on third-harmonic analysis of leakage current

机译：基于漏电流三次谐波的在线避雷器状态监测

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摘要

Surge arresters play an important role in maintaining the reliability and protection of the high voltage power systems. Various diagnostic online monitoring methods of surge arrester are based on the decomposition of the measured leakage current into their capacitive and resistive components. The arrester's resistive component of the leakage current, in particular, the third harmonic component, is known as to be directly related to the degree of degradation of the ZnO blocks. This paper proposes an online monitoring technique for the surge arrester under dry and pollution conditions when measuring either the total leakage current or both the internal and external leakage currents of three different types of surge arresters. This technique based on feature extraction of the magnitudes, frequencies, and phase angles of all frequency components of the real measured current signals using Prony analysis-Hilbert transform approach and MATLAB program. The observed results illustrate the viability of this technique for online monitoring of surge arrester. Furthermore, the effect of voltage harmonics on the measured leakage currents is investigated through surge arrester model simulation performed with PSCAD program.
机译：避雷器在维持高压电源系统的可靠性和保护方面起着重要作用。避雷器的各种诊断在线监测方法都基于将测得的泄漏电流分解成其电容和电阻成分。已知泄漏电流的避雷器的电阻分量，特别是三次谐波分量，与ZnO块的劣化程度直接相关。本文提出了一种在线监测技术，用于在干燥和污染条件下测量三种不同类型电涌放电器的总泄漏电流或内部和外部泄漏电流时的电涌放电器。该技术基于使用Prony分析-希尔伯特变换方法和MATLAB程序对真实测量电流信号的所有频率分量的幅度，频率和相角进行特征提取的功能。观察到的结果说明了该技术在线监测电涌放电器的可行性。此外，通过使用PSCAD程序执行的电涌放电器模型仿真，研究了电压谐波对测得的泄漏电流的影响。

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