广州地铁五号线杂散电流防护研究与设计

《广州地铁五号线杂散电流防护研究与设计》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、兰州交通大学毕业设计（论文）摘要目前地铁大都采用走形轨回流的直流牵引供电方式，因而在运营中将不可避免地产生流经大地的杂散电流。地铁杂散电流严重腐蚀地下金属结构，影响地铁安全运营，因此全面考虑地铁杂散电流腐蚀问题，探讨更为有效的杂散电流腐蚀防护措施，保证地铁安全运营具有十分重要的意义。本文首先介绍杂散电流的产生、危害及其对结构钢筋和埋地金属管线的腐蚀机理；然后分析在有无排流网设置、是否排流情况下单边供电方式和双边供电方式中杂散电流的分布规律及各个参数对杂散电流的影响，并据此讨论杂散电流的防护措施和监测手段。最后结合广州地铁五号

2、线工程的特点，综合提出广州地铁五号线的杂散电流防护系统设计方案。广州地铁五号线杂散电流防护方案包括设置杂散电流排流网、新型智能排流装置的杂散电流防护方法和集中式监测系统。集中式监测系统将采集结构钢极化电位、参考电极本体电位和轨道对结构钢的电压等数据上传至上位机处理，实现对整个系统进行实时在线远程监测，为地铁杂散电流防护提供参考。关键词：地铁；直流牵引供电系统；杂散电流；腐蚀；防护-I-兰州交通大学毕业设计（论文）AbstractCurrently,therunningrailsareusuallyusedastheretur

3、nconductorforDCtractionpowersupplysysteminthemetro.Therefore,itisinevitablethattherewillbecurrentleakingintogroundthroughtherunningrails,resultingintheseriouscorrosiontotheundergroundmetalstructureandinfectingsafeoperationofthemetro.Thus,itisverynecessarytofullycon

4、siderthestraycurrentcorrosionissue,toexploremoreeffectiveprotectivemeasuresforstraycurrentcorrosioninordertoensurethesafeoperationofthemetro.Firstly,adiscussionofthecauseandhazardofstraycurrentinDCtractionpowersupplysystemandthemechanismofcorrosionofittosteelstruct

5、ureandmetalpipelinearepresentedinthispaper.Then,theregularitiesanddistributionofstraycurrentareanalyzedateitherdrainageornon-drainagesituationinone-wayfeedingandtwo-wayfeedingpowersupplysystem.Andeachfactorthataffectedstraycurrentdistributionrulehasbeenanalyzed.Ont

6、hebasisofstraycurrentdistributionrule,themethodsandmeasurestocontrolandmonitorstraycurrentarediscussed.Finally,accordingtothecharacteristicofconstructionprojectsofGuangzhoumetroline5,theproperstraycurrentprotectionandmonitoringsystemisdesigned.Thestraycurrentprotec

7、tionandmonitoringsystemiscomposedoftheprotectionmethodsofstraycurrentsuchasdrainagenet,anewsintellectualdrainagearrangementandcentralizedmonitoringsystem.Thedatasuchasthesteelpolarizationpotential,referenceelectrodebodypotentialandtherunningrailsonstructuralsteelpo

8、tentialiscollectedbyitsmonitoringsystemandtransmittedtotheuppercomputerprocessing.Thereal-timeandon-linemonitoringsystemmonitorsthewholesystemrem