垂直接地极和深井接地极共用的相互影响研究

Research on the Interaction Between Multi-Circuit Shared HVDC Grounding Electrodes

[目的]和独立接地极不同,共用接地极为多个直流系统连接,其参数和运行方式需要由其相连的各个系统决定,系统之间存在相互影响,设计时需要全方位考虑各种因素。[方法]采用CDEGS软件,首先分析两个接地极之间的相互影响因素和规律,特别是深井接地极和垂直接地极间的相互影响;然后研究实际场景下多个接地极同时运行和共用时,同极性运行和异极性运行对跨步电势的影响。[结果]仿真结果表明,接地极间的相互影响程度随着土壤电阻率特性、电极间距离的变化而改变。深井接地极对垂直接地极的影响有别于垂直接地极相互之间的影响。[结论]文章研究了垂直接地极和深井型接地极之间相互影响的一般规律,为共用接地极方案提供理论和技术支持,为今后接地极的设计工作打开新的思路。

[Introduction]Unlike the independent grounding electrode,shared earth electrode is connected to multiple DC(Direct Current)systems,and its parameters and operation mode need to be determined by each system connected to it.There are mutual influences between systems,and various factors need to be considered comprehensively during design.[Method]By using CDEGS,the mutual influence factors and laws between the two grounding electrodes were analyzed,especially the mutual influence between the deep well grounding electrode and the vertical grounding electrode.Then the influence on the step potential with the same polarity operation and different polarity operation when multiple grounding electrodes operate and share at the same time in the actual scenario was studied.[Result]The simulation results show that the degree of interaction between grounding electrodes changes with the change of soil resistivity characteristics and the distance between electrodes.The influence of deep well grounding electrode on vertical grounding electrode is different from that of vertical grounding electrode.[Conclusion]The general law of interaction between vertical grounding electrode and deep-well grounding electrode is studied in this paper,which can provide theoretical and technical support for the scheme of shared grounding electrode,and opens up new ideas for the design of grounding electrode in the future.