Arc fault can be accidentally produced in electrical system. In this paper a new approach to the arc modeling is discussed. A new arc model is proposed based on the Mayr arc model, which enriches the arc model parameters. According to the corona discharge at beginning of arc, the corona resistance and two special electric components ( electric current diode) are taken into account, and the Mayr arc model is improved. In the Matlab/Simulink environment, the arc fault occurring on the line is simulated using the package of the new arc model sub⁃system, and the experiment of the occurrence of the series fault arc on the line is performed with the simulated cir⁃cuit. By comparing the simulation and experiment results, the fault arc current of the improved model is basically in coincidence with the experiment, and the feasibility and accuracy of the new arc model are verified.%电力系统中经常会发生故障电弧，本文在Mayr电弧模型的基础上提出一种适用于串联故障电弧的新模型。针对电弧开始阶段的电晕放电，把电晕电阻和两个特殊电气部件（电流二极管）考虑在内，结合Mayr电弧模型，丰富了电弧模型参数。在Matlab／Simulink仿真环境中，用新的电弧模型封装子系统对线路发生的串联故障电弧进行仿真，并依据仿真电路模拟线路发生串联故障电弧的实验。对比仿真和实验结果得到，改进的电弧模型的故障电弧电流与实验采集到的故障电弧电流基本吻合，验证了新模型对分析串联故障电弧的特性具有可行性和准确性。
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