The current study is aimed at investigating the exact location of partial discharge (PD) in coil insulation of a 6 KV/250 KW induction machine. Since measured PD signals have frequency components of kilohertz (KHz) to megahertz (MHz), it is necessary to employ fast and very fast transient models of electrical machines for locating PDs. In this study, a PD current pulse with MHz frequency component is injected to the multi-conductor transmission line model of each turn of the coil with frequency validity of >1 MHz. Considering coils as an interface between voltage source and finite element region, all circuit and field equations are rewritten to obtain the system final matrix, so that PD pulse is extracted. Experiment and simulation results show high accuracy of developed model to determine the exact location of PD.

中文翻译：

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使用电机的高频模型确定高压电机线圈绝缘中局部放电的确切位置

当前的研究旨在调查6 KV / 250 KW感应电机线圈绝缘中局部放电（PD）的确切位置。由于测量的PD信号具有几千赫兹（KHz）到兆赫兹（MHz）的频率分量，因此有必要采用快速且非常快速的电机瞬态模型来定位PD。在这项研究中，将具有MHz频率分量的PD电流脉冲注入到线圈每匝的多导体传输线模型中，其频率有效性> 1 MHz。将线圈视为电压源和有限元区域之间的接口，重写所有电路方程和磁场方程以获得系统最终矩阵，从而提取出PD脉冲。实验和仿真结果表明，所开发模型能够确定PD的精确位置。