局部放电(PD)检测和定位对电力电缆绝缘状态监测具有十分重要的意义，有必要建立一个精确的电缆模型对局部放电电磁脉冲的传播特性进行分析。考虑到电缆结构的复杂性，难以得到高精度的等效电路模型，因此采用数值电磁方法，通过构建良好的电缆模型，在时域中分析电缆及其中间接头的局部放电电磁波的传播特性，并对其传播特性进行仿真，计算局部放电源沿不同方向传播产生的电场，将计算得到的电缆中的PD信号波形与接头模型中的信号波形进行对比。结果表明，局部放电产生的电磁波在电缆和电缆中间接头中的传播规律存在很大差异，因此，在电缆局部放电检测与定位时要考虑电缆中间接头的影响。
Partial discharge (PD) detection and location is of great significance for the power cable insulation condition monitoring, so an adequate cable model is needed to build to analyze the PD electromagnetic pulse propagation characteristics. Considering the complex structure of the cable and high accurate equivalent circuit model is hard to obtain, we applied numerical electromagnetic method. The propagation characteristics of PD electromagnetic wave of cables and joints in time domain were analyzed through building good cable model, and the propagation characteristics were simulated. The electric field produced by the PD source propagating along different directions was calculated, and the calculated PD waveforms in the cable are compared with those in the cable joint model. The results show that the propagation characteristics of PD electromagnetic wave in the cable and joint have big difference. Therefore, the PD detection and location for cables need to consider the effects of cable joints.
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