输电线路杆塔接地网典型接地材料散流特性研究

Research of Typical Grounding Material Current Release Characteristic in Transmission Tower Grounding Grid

锰铜、圆钢及石墨复合接地材料作为输电线路杆塔接地网常见的三种接地材料,因材料本身电磁参数的不同使得接地体工频与冲击散流特性有区别。为此针对三种典型接地材料,采用软件CDEGS对3种接地体进行仿真建模计算,分别对比分析了3种常见金属及非金属接地材料在不同频率、不同土壤条件及不同直径下的接地散流特性,阐述了接地体散流特性对接地阻抗的影响并给出结论,研究结果为输电线路杆塔接地网选材及外延降阻设计提供参考依据。

Copper,steel and graphite composite grounding material are three commonly used grounding materials in transmission tower grounding grid.There are differences of power frequency and impulse current release characteristics among the above three grounding material owing to their different electromagnetic characteristics.Simulation calculations have been conducted on their grounding current release characteristics by CDEGS.Three factors have been considered in this paper,including different frequencies,different soil condition and different diameter.The effect of current release characteristics on grounding resistance have been analyzed in detail.The work conducted in this paper can provide reference for the selection of grounding material and expand designation of grounding resistance reduction.