Consideration of Generation Mechanism of Low Frequency Component of Partial Discharge Signal Detected by Transient Earth Voltage

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI:10.1109/CMD.2018.8535989

Hiromasa Yoshizumi, Y. Nakano, M. Kozako, M. Hikita, Yuuki Fujii, Yusuke Nakamura, Hiroaki Cho

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引用次数: 2

Abstract

Transient earth voltage (TEV) detection method is drawing attention for its readiness to be installed just on the outer wall of existing equipment, and is useful for partial discharge (PD) detection. The purpose of this research is to establish reliable insulation diagnosis technique of high voltage equipment based on partial discharge detection using TEV method. Our previous study showed that TEV sensor dominantly detects high (several 100 MHz) and low frequency (several 10 MHz) components attributed to the electromagnetic wave propagating through space and discharge current flowing through the ground line, respectively. To investigate a mechanism of generated low frequency components further, this paper deals with the effect of the length of PD measurement circuit on the low frequency component detected by TEV sensor by experiments and simulation of electromagnetic wave propagation using finite difference time domain (FDTD) method. As a result, it was found that the low frequency component includes two different kinds of dominant resonance frequencies determined by assuming the measurement circuit to act as a lumped constant electric circuit and as an antenna such as dipole antenna and loop antenna.

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瞬态接地电压检测局部放电信号低频分量产生机理的思考

暂态接地电压(TEV)检测方法可直接安装在现有设备的外壁上，可用于局部放电(PD)检测，因此备受关注。本研究的目的是建立基于TEV法局部放电检测的可靠高压设备绝缘诊断技术。我们之前的研究表明，TEV传感器主要检测高(几个100 MHz)和低频(几个10 MHz)的分量，分别归因于电磁波在空间传播和流过地线的放电电流。为了进一步研究低频分量产生的机理，本文采用时域有限差分(FDTD)方法对TEV传感器检测到的低频分量进行了实验和仿真，研究了PD测量电路长度对TEV传感器检测到的低频分量的影响。结果发现，低频分量包括两种不同的主导谐振频率，这是通过假设测量电路作为集总常数电路和天线(如偶极子天线和环路天线)来确定的。

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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2018 Condition Monitoring and Diagnosis (CMD)

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