输电杆塔不同形状接地体最大跨步电压轨迹包络线分布规律研究

Distribution Law of the Maximum Stride Voltage Track Envelopes of Transmission Tower Grounding Devices of Different Shapes

针对输电杆塔向人口密集区分布越来越普及化的问题,对输电杆塔不同形状接地体杆塔周围地电位和最大跨步电压轨迹包络线分布规律进行了研究,分别对方框型、方框带斜射线型、方框带垂直射线型以及圆环型四种接地体进行了现场模拟试验测量与仿真计算。通过对试验结果分析表明,方框带射线型较方框型地电位和最大跨步电压大小明显减少,且射线的角度对其影响较少;圆环型接地体地地位分布最均匀,适合在人口密集区使用。得出了不同接地体形状的电位分布与最大跨步电压的轨迹包络线。

Aiming at the problem that transmission towers are more and more popularized in the densely populated area,this paper studies the distribution law of the ground potential and the stride voltage trace around the poles of different shapes of transmission towers. Field simulation experiments and simulation calculations were conducted on the 4 kinds of grounding conductors： box-type,oblique-ray box-type,vertical-ray box-type,and circle-type. Analysis of the experimental results show that by the radiation-ray box-type grounding,the potential and the maximum step voltage are more significantly reduced than the box-type grounding,and the angle of the ray less affected. Circular grounding body has the most evenly distributed status,suitable for use in densely populated areas. The earth shape of the different potential distribution and the maximum step voltage trace envelope are also obtained.