In this paper, magnetic field testing guidelines in the running CRH1 were given, and field distribution data were obtained by actual measurement. According to the general international standards of low frequency (LF) magnetic field emission and national environmental norms GB 9175-88, the LF magnetic field evaluation within the Electric Multiple Unit (EMU) was carried out, which showed that the ambient field is in the permission range under a special industrial environment within 5 times surplus capacity. Based on the EMU's specific electrical construction, the factors of overhead contact system (OCS), car roof, windows and rail were taken into account, then the LF field emission model was set, and the mechanism was analyzed. Thus, the LF magnetic field distribution regularity was gotten. And the results showed that the interior intense magnetic field of the EMU mainly derived from the window current induction. Moreover, in terms of magnetic field probability, an offline judge index was proposed.%给出运行状态下CRH1型动车组磁场环境测试的实施导则,在此基础上现场实测获得车体内场分布相关数据.参考低频磁场发射一般国际准则以及GB9175-88国家环境场要求,对动车组车内低频磁场环境进行评估,结果表明:5倍富裕度下动车环境磁场在特殊工业环境许可范围内.并根据车体具体电气结构,综合考虑接触网、车顶、钢轨及窗口等因素,建立低频磁场发射模型,完成机理分析,由此得出该型动车组车体动态低频磁场分布特性.研究结果表明弓网离线所导致的车内强磁场主要源自窗口感应电流的作用,最后给出基于磁场概率的离线判别指标.
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