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

  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.