This study presents a grid-searching method in polar coordinate system (GSMIPCS) for the partial discharge (PD) location, in which the grids were divided into sectors according to radial distance r , azimuthal angle θ and polar angle φ. After theoretically proving that the positioning angle error, based on time difference of arriving algorithm, is relatively small, this study gives the process of PD positioning in two-dimensional and three-dimensional polar coordinates. Thereafter, this study discusses the optimal setting of grid parameters. The simulation results show that the success rate of angle positioning (SROAP), i.e. a percentage of positioning number with positioning angle error <2° in the total positioning number, for θ angle using two-dimensional (2D) GMSIPCS is 95.87%. For 3D GMSIPCS, the SROAP for θ and φ are 86.18 and 92%, respectively; and the computational cost is lower to 216. Finallly, on-site experiments in the substation verify the effectiveness of the proposed method.

中文翻译：

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变电站局部放电极坐标系统的网格搜索方法

这项研究提出了一种在极坐标系（GSMIPCS）中针对局部放电（PD）位置的网格搜索方法，其中根据径向距离将网格划分为扇区 [R ，方位角 θ和极角φ。在理论上证明了基于到达时间差的定位角误差较小后，给出了二维和三维极坐标下的局部放电定位过程。此后，本研究讨论了网格参数的最佳设置。仿真结果表明，对角定位成功率（SROAP），即定位角误差<2°的定位数占总定位数的百分比，对于θ使用二维（2D）GMSIPCS的角度为95.87％。对于3D GMSIPCS，SROAP用于θ和φ分别为86.18和92％; 计算成本降低到216。最后，变电站的现场实验证明了该方法的有效性。