Spectral Method for Localization of Multiple Partial Discharges in Dielectric Insulation of Hydro-Generator Coils: Simulation and Experimental Results

Abstract A methodology based on spectral analysis for localization of multiple partial discharges in dielectric region of hydro-generator coils is proposed. This pinpointing of multiple discharges aims to provide means for performing diagnosis of insulating regions of the coil. A numerical model of the structure was developed by using the finite-difference time-domain method (FDTD-3D) to solve Maxwell’s equations. Transient voltage associated with partial discharges that occurs at different positions of the coil is calculated at specific point and its spectrum is used to perform the diagnosis. In 90% of simulations, accurate estimates of simultaneous discharges location were obtained. Physical phenomena allowing the development of the methodology are assessed numerically and experimentally. Finally, a localized artificial PD injection schema is proposed and used for validating our numerical results and physical analysis.

摘要：本文提出一种基于频谱分析的水轮发电机线圈绝缘区域多局部放电源定位方法。该多局部放电定位技术旨在为线圈绝缘区域的故障诊断提供可行技术手段。研究采用三维时域有限差分法（finite-difference time-domain method, FDTD-3D）求解麦克斯韦方程组，构建了该线圈结构的数值模型。在特定测点处，计算线圈不同位置局部放电对应的瞬态电压，并利用其频谱开展诊断分析。在90%的仿真实验中，该方法可精准获取同时发生的局部放电源的位置信息。对支撑该方法构建的物理机制开展了数值与实验验证。最后，提出一种局部人工局部放电注入方案，用以验证本研究的数值结果与物理分析结论。

搜集汇总

背景与挑战

背景概述

该数据集包含了一项基于光谱分析的方法，用于定位水轮发电机线圈绝缘材料中的多个局部放电。研究通过数值模拟和实验验证了该方法的有效性，并在90%的模拟中实现了准确定位。