Impacts of the Pipe Network around the Substation and the New Grounding System on the Characteristic Parameters of the Original Grounding Grid
In the context of the"Dual Carbon"goal,with the construction of a new power system dominated by a high proportion of new energy,the original substation grounding grid is no longer able to meet current needs.There exist issues with the safe operation of the new and old grounding grids,as well as the parameter changes caused by the connection of the surrounding underground metal pipeline network.If a certain parameter of the grounding grid does not meet the standard,it will affect the stable operation of the substation and equipment inside the station,and also have a serious impact on personal safety.Therefore,it is necessary to analyze the safety limits of the parameter indicators of the original substation's surrounding pipeline system,such as the reconstructed grounding network and metal pipeline network,and comprehensively consider the impacts of layered soil structure,underground metal pipeline network,and other surrounding terrain on the safe operation of the reconstructed grounding network.Based on the method of moments and combined with the CDEGS grounding grid simulation software,this article builds a mathematical model of the new and old grounding grids and surrounding metal pipelines.Taking into account various soil characteristics,we have analyzed and studied metal pipelines around the substation and the newly built grounding grid for various characteristic parameters of the original substation,and obtained the resistance coupling influence curves and comparison of various grounding parameters between the substation grounding network and metal pipelines,as well as between the original grounding network and the newly built grounding network under various conditions,and proposed corresponding protective measures accordingly.The experiment in this article has found that laying an insulation layer on metal pipelines can effectively reduce the dissipation effect of the pipeline,but it is not significant in reducing the contact voltage.Before and after laying the insulation layer,the contact voltage only decreases by 3％;connecting the new grounding grid to the original grounding grid can reduce the maximum contact voltage of the original substation grounding grid by 28.1％,and the resistance reduction rate reaches 20％.The paper can provide a certain theoretical basis for the renovation project of the substation grounding network and the construction of new power systems.
substationnew grounding gridmetal pipe networkmethod of moment
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