中文摘要：

随着我国高压直流输电工程的快速建设，其电磁环境问题日益受到广泛关注，线下离子流场中导体充电问题是其中一项比较重要的问题。该文对上流有限元法进行改进，使其能够计算离子流场中经电阻接地导体的充电电位，计算结果与实验结果具有较好的一致性，证明了该算法的正确性。基于所提算法，讨论接地电阻变化时充电导体电位的变化规律。当接地电阻很大时，该方法计算结果为离子流场中悬浮导体的电位值；离子流场中悬浮导体充电电位绝对值比导体不存在时相同位置的电位值高。考察离子流场中悬浮导体的电位问题，需要进行离子流场数值计算。

英文摘要：

With the rapid construction of high voltage direct-current （HVDC） transmission projects, its electromagnetic environment problems excite increasingly widespread attention, of which the conductor electrification in ionized field is an important problem. Upstream finite element method （FEM） was improved to calculate the potential of the conductor grounded via resistance in ionized field. The numerical results agreed with measured values well and the validity was verified. Based on the method, the potential varying characteristic of the charged conductor with the grounded resistance changing was considered. If the value of grounded resistance is tremendous, the numerical result is equal to the potential of floating conductor in ionized field. The potential absolute value of floating conductor in ionized field could be higher than the corresponding position without the conductor. To analyze the potential of floating conductor in ionized field, the ionized field numerical calculation is needed.