地铁杂散电流的防护方案的研究和设计

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1、西南交通大学硕士研究生学位论文第1I页AbstractInDCrailtransitsystems，therunningrailsareusuallyusedasthereturnconductorfortractioncurrent．Thisarrangementmainlyfocusesoneconomicconsiderations，sinceitdoesnotrequiretheinstallationofanadditionalreturnconductor．Therailsalongtherailway,whichlieexposedonthegrou

2、nd，willeasilycauselargerstraycurrent．Whenthetrainoperatesinheavytransportationofmassrailtransit(MRT)systems，thecurrentrequiredbythetrainwillbequitelargeuptoseveralthousandamperesandtheresistanceoftherunningrailwillbeaboutseveralmilliohmstotensofmilliohmsperkilometer．Therefore．asignifi

3、cantvoltagedropontherunningrailwillbegenerated．Thisvoltagedropwillforcepartsofthecurrenttoleakfromtherailandflowintopipeworkintheearthorsteelbarsinastructure．Afterwards，thecurrentleavesthepipeorsteelbarandflowsthroughtheearth，backintothenegativesideofthetractionsubstation．Thiscurrenti

4、sknownasthestraycurrentortheleakagecurrent．StraycurrentcauseselectricalcorrosionnotonlytothestructureandpipinginMRTsystems，butalsotoadjacentstructuresandundergroundpiping，includingthosecarryingoil，gasandwater．Drainagenetisdefinedastheintegrateballastbedandthesteelbaroftunnel．Themethod

5、isthatmaketheconductorofdrainagenetconnecttherunningraildirectly,whichmakestarrycurrentretumtothecathodeofsubstation．Asamatterofexperience，sincethemagnitudeofdrainagecurrenthasimportantaffectonthemetro，adrainageequipmentmustbeappendedbetweendrainagenetandtherunningrailandthemagnitudeo

6、fdrainagecurrentmustbeCOntrolled．Thisthesisanalyzedtheprinciplesoftheelectricalcorrosionandproposeamoduleofstraycurrent，fromwhichweknowwhatfactorsinfluencethegenerationofthestraycurrentandhowlargeproportionofeachfactorcounts．Atthesametime，monitorpointsofmonitorsystemwereconcludedbyexp

7、erienceonthespot．Basisonfuzzycontroltheorythefuzzycontrolalgorithmwasdesigned，bywhich，aprocesswasprogrammedtocomputethedrainageofmetro．Thethesiscanconsiderallofpolarizedpotentialroundly,SOareasonablecurrentcanbeobtained．Thenbythosetheapplicationofthisthesiswillrelievethehardworkofthep

8、rotec