直流牵引供电系统杂散电流分布和防护的研究

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1、西南交通大学硕士研究生学位论文第1I页AbstractInDCtractionpowersupplysystem，moreandmoreattentionshavebeenpaidtotheproblemofmetalstructurecorrosionfromstraycurrent．Straycurrentprotectionmethodcanbedevelopedbycarryingouttheoreticalanalysisanddigitalsimulationofit．Andsuitablecriteriaforstraycurrentprotecti

2、ondesigning，constructionandoperationthatcaninsurelong-termsafetyandreliabilitycanalsobefound．InthispaperafurtherdiscussionofthecauseandhazardofstraycurrentinDCtractionpowersupplysystemandthemechanismofcorrosionofittosteelstructureandmetalpip’elinearepresentedfirst；andthen,threemodelso

3、fthedistributionofstraycurrentofDCtractionpowersupplysystemarebuilt，followedbyatheoreticalanalysiscarriedoutonthesethreemodels．Methodsofreducingstraycurrentareproposedbyanalyzingtheimpactofrailandenvironmentparametersonrailvoltage，railcurrentandstraycurrent．Andalsotheregularitiesofdis

4、tributionofrailvoltage。railcurrentandstraycurrentarefound．AndthenthedataofstraycurrentofDaliaurapidrailwayline3．andGuangzhousubwayline1．areanalyzed，andthetheoreticalanalysisanddi百talsimulationinthisPaperareprovedtobetrue．Atlast，meritsanddemeritsofseveralprotectionmethodsofstraycurrent

5、corrosiontometalarepointedoutbymatch／rigthemwitheachother．ThemainconclusionsofthisPaperarepresentedasfollows：Toreducestraycurrent,firstandforemost，theresistanceperunitlengthofrunningrails／earthneedstobeincreased．Then,theresistanceperunitlengthofrunningrails，thelengthoffeedingsectionan

6、dthetractionloadshouldbereduced．Asfortheresistanceperunitlengthofthemetalhc-conductiveinterconnectedstructure，themetalpipelinealongrailsandtheearth)itplaysonlyaminorroleincontrollingstraycurrent．Selectivedrainagemethodiseconomicandreliable，butitsdrainagecurrenthastobecontrolledaccurat

7、ely．KeyWords：DCtractionpowersupplysystem；Straycurrent；Corrosion；Protection；Transitionresistance西南交通大学硕士研究生学位论文第1页第1章绪论1．1杂散电流的产生及其危害1．1．1二-般杂散电流的定义正常情况下，电流应该按照人们的设计要求在指定的导体内流动，如果由于某种原因，一部分电流离开了指定的导体而在原来不应有电流的导体内流动，这部分电流就叫杂散电流Isl。1．1．2杂散电流的产生随着国民经济的持续发展，我国各个城市为了缓解日趋严重的城市交通压力，纷纷加快了城市轨道交

8、通的建设。