砥砂岩地区层控接地特性及分形外延优化研究

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中图分类号：TM862 文献标识码：A DOI： 10.7535/hbgykj.2026yx01008

Abstract：Inorderto solve the problem of insufficient grounding performance of railway traction power supply system in Pisha-sandstone areas，the layer-controlled grounding characteristicsof this special geological region were investigated.A fractal extension optimization method combining an index exponentially graded spacing configuration and peripheral mesh refinement atedgesandcorners was proposed.Firstly，ahorizontalllayered soil model was established basedonthe measured soil characteristic parameters suchasresistivityand moisturecontentalong the Xinzhunrailwayline.Then，simulationanalysis of diferent grounding models using CDEGS softwarewasconducted，witha focus onthe leakage characteristicof horizontal groundingelectrodes.Finaly，fractal theorywasused tooptimizeradial grounding electrodesbycombining exponentially graded spacing configurationand peripheralmesh refinement at edges and corners，and electrical parameters suchas grounding resistance，touch voltageandstepvoltageof thegroundinggrid wereanalyzed.Theresultsshow that thedistribution characteristicsof thetopsoilresistivityhadasignificantimpactontheeficiencyof thegroundingresistancereduction，andthat thebedrock atthebottomseriouslyreduced theeficiencyoftheverticalearth electrode.Thefractal extended electrodewith optimal parameters are a fractal angle of 90∘ ，a fractal dimension of O.431，and a fractal layer count of 2. Adopting the index exponentiallygraded spacingconfiguration with aoptimumcompresion ratioofO.8，The proposed method can significantly improve grounding safety demonstrates a 41% reduction in grounding resistance，demonstrates targeted applicability to Pishasandstone areas exhibiting distinctive geological features.Theresearchresultscanprovideareference forreducing the resistance of the grounding grid of railway traction power supply system in areas with high soil resistivity.

Keywords：powersystem and itsautomation；epitaxial grounding grid；horizontall layered soil；fractaltheory；unequalspacing； CDEGS； Pisha-sandstone

电力机车速度快、效率高、运输能力强、绿色环保，是铁路现代化的标志[1-2]。（剩余16612字）