杆塔接地电极的冲击散流分布研究及结构优化

Study on Optimization of Grounding Electrode Structure of Tower Based on Law of Impact and Divergence Distribution

首先以CDEGS为仿真平台,建立了考虑土壤非线性电离的接地电极仿真模型,并对模型的正确性进行了验证;接着仿真了四种实际尺寸的放射型接地电极冲击散流分布规律,结果表明导体的水平射线部分的散流能力远大于中部方框部分,因此应当考虑在水平射线部分对接地电极进行优化改造;基于冲击散流分布规律,提出了两种接地电极结构优化方法,改进后不同冲击电流幅值下的冲击接地电阻值均有所下降,在冲击电流较小时效果更明显,且改进型2更适用;最后对工程实际水平放射型接地电极优化改进,改进后电位及冲击接地电阻值都有所降低,说明改进方案是有效的。文章研究结果对杆塔接地电极优化设计具有参考意义。

Firstly,a simulation model of grounding electrode considering nonlinear ionization of soil is established based on CDEGS,and the correctness of the model is verified. Secondly,the impacting dispersion distribution of four kinds of radial grounding electrode is simulated. The results show that the diverting ability of the horizontal ray part of the conductor is much larger than that of the middle square part. Therefore,it is necessary to optimize the grounding electrode in the horizontal ray part. Based on the distribution law of impulse current,two optimization methods of grounding electrode structure are proposed. After improvement,the value of impulse grounding resistance decreases under different amplitude of impulse current,and the effect of resistance reduction is most remarkable when the impulse current amplitude is low. At last,the potential and impulse grounding resistance of the improved horizontal radial grounding electrode are reduced,which shows that the improved scheme is effective. The research results have reference significance for the optimization design of tower grounding electrode.