Abstract:
Introduction To solve the problem of difficult site selection for grounding electrodes in HVDC transmission projects in Guangdong, this paper analyzes the connection of existing grounding electrodes to form a WAN grounding electrode for future DC project access to reduce the impact on electrical facilities and underground metal piping facilities around the electrode site.
Method The feasibility of forming a wide-area grounding electrode by using existing grounding electrodes as sub-grounding electrodes was analyzed, several typical application scenarios of WAN grounding electrodes were proposed, and the natural shunted current calculation, current distribution averaging and multiple DC simultaneous operation conditions of each sub-grounding electrode were carried out.
Result WAN grounding electrode can reduce the design requirements of Yuedong pole site and mitigate the impact of Yulongling grounding electrode on oil and gas pipeline and surrounding power system, and has the feasibility of implementation. However, the benefits are still not obvious without adding any current averaging resistors.
Conclusion This study provides ideas and methods to reduce the difficulty of constructing new grounding electrodes by using WAN grounding electrodes.
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