With the increase of voltage levels in substation corona discharge on the surface of high voltage conductors and equipment in substations becoming more and more severe, the influence on the electromagnetic environment around substations is becoming more and more obvious. In order to study the influence of corona discharge on the ground electric field under substation equipment in AC substations, this paper proposes an improved method based on Abdel-Salam’s calculation of the ion flow field on AC power lines. By redefining the criterion of corona onset and the amount of emission charge and combining with the migration, motion, and recombination of the space charge, a new model which can be applied to the calculation of AC ion flow field electric field of multiphase bundle conductors in substations is established. The calculation results of the ground power frequency electric field of the conductor at the typical tower in the light, medium, and heavy ice regions of 750 kV typical AC transmission project show that the ground electric field gradually decreases with the increase of conductor height. At the same conductor height, the ground electric field strength in the heavy ice region is the largest, while under the conductor in a light ice region, it is the smallest, and the minimum allowable conductor-to-ground distance can be concluded that the national standard limit value is not exceeded when the conductor-to-ground distance in light ice region is 24.5 m, the conductor-to-ground distance in medium ice region is 25.5 m, and the conductor-to-ground distance in heavy ice region is 26 m.

中文翻译：

---

考虑交流离子流场的变电站设备电场计算

随着变电站中电压水平的升高，变电站中高压导体和设备表面的电晕放电越来越严重，对变电站周围电磁环境的影响也越来越明显。为了研究电晕放电对交流变电站设备下地面电场的影响，提出了一种基于Abdel-Salam对交流电力线上离子流场进行计算的改进方法。通过重新确定电晕发生的判据和发射电荷的量，并结合空间电荷的迁移，运动和重组，可以将一种新模型应用于计算多相束导体的AC离子流场电场。变电站建立。在750 kV典型交流输电工程的轻，中，重冰区，典型塔架导体的地面工频电场的计算结果表明，地面电场随着导体高度的增加而逐渐减小。在相同的导体高度下，重冰区域的地面电场强度最大，而在轻冰区域的导体下方的地面电场强度最小，并且导体到地面的最小允许距离可以得出结论：当轻冰区域的导体到地面距离为24.5 m，中冰区域的导体到地面距离为25.5 m，重冰区域的导体到地面距离时，不超过国家标准限值是26 m