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Investigation on the placement effect of UHF sensor and propagation characteristics of PD-induced electromagnetic wave in GIS based on FDTD method

机译：基于FDTD方法的GIS中UHF传感器的放置效果和PD感应电磁波在GIS中的传播特性研究

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摘要

Using ultra-high-frequency (UHF) method in practical partial discharge (PD) detection can be affected by the positioning and placement of the UHF sensor. This in turn can affect the PD diagnosis. To ensure optimal performance of the sensor and understand the propagation process of electromagnetic (EM) wave, there is a need to fully analyze how the sensor??s placement affects the output signal and the attenuation of EM wave in various positions and directions. As the previous researches are mainly concentrating on the radial component of the UHF signal, the propagation of the signal components in axial and radial directions and that perpendicular to the radial direction of the GIS tank are investigated in detail in this paper. Firstly, the attenuation of UHF signals at different radial positions of a GIS model is analyzed using the finite difference time domain (FDTD) method. Then, secondly, the coupled signals in the three directions are calculated respectively. By comparing the signal received for different directions and circumferential angles, the peak to peak value (Vpp) and cumulative energy of the coupled voltage in each case are considered both in the time and frequency domain. As well, the attenuation characteristics and rules are summarized, based on which a new method for circumferential and axial location is proposed. The investigation on the propagation and the detection mechanism of EM wave in GIS provides a significant understanding of the application of UHF sensor and actual PD detection.
机译：在实际局部放电（PD）检测中使用超高频（UHF）方法可能会受到UHF传感器的定位和放置的影响。这进而会影响PD诊断。为了确保传感器的最佳性能并了解电磁（EM）波的传播过程，需要全面分析传感器的位置如何影响输出信号以及EM波在各个位置和方向的衰减。由于先前的研究主要集中在UHF信号的径向分量上，所以本文详细研究了信号分量在GIS储罐轴向和径向以及垂直于GIS储罐径向的传播。首先，利用时差有限差分法（FDTD）分析了GIS模型不同径向位置的UHF信号衰减。然后，其次，分别计算三个方向上的耦合信号。通过比较在不同方向和圆周角上接收到的信号，可以在时域和频域同时考虑耦合电压的峰峰值（V p>）和累积能量。总结了衰减特性和规律，提出了一种新的圆周和轴向定位方法。对电磁波在GIS中的传播和检测机制的研究为了解UHF传感器的应用和实际的局放检测提供了重要的认识。

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