500kV超高压电缆设计

哈尔滨理工大学学士学位论文-I摘要随着社会经济的发展和用电需求的不断增长，城市输电系统正在逐步从架空线路向电力电缆方向发展，电力电缆正逐步向更高电压等级、更大传输容量发展，500kV超高压电力电缆的应用将逐渐扩大。但目前国内对超高压电缆及附件的开发能力、长距离500kV电缆的设计、施工和运行等问题的研究还比较薄弱，相应的技术很难跟上发展的速度，500kV超高压电力电缆的设计、选材和生产也面临着重重问题，超高压电力电缆的设计研发经迫在眉睫。本文简述了500kV电缆的研究背景及意义，介绍了国内外的发展现状并着重了解了日本的发展过程。给出了500kV单芯电力电缆的典型结构，对充油电缆和XLPE电缆进行了对比，给出了生产XLPE聚乙烯料应满足的性能需求及挤包的相关问题。概述了超高压电缆的屏蔽层缓冲层的意义，对金属护套的选择和生产工艺进行了详细介绍，叙述了超高压电缆外护层的性能要求和阻水的意义等相关问题，简要介绍了载流量的计算。最后，通过对XLPE电缆和充油电缆的对比可以知道XLPE电缆优势明显，必然成为EHV发展的主要趋势。本文对500kVXLPE的选材结构等进行了较为全面的介绍，希望可以为500kVXLPE电缆的设计和生产提供一些帮助。关键词500kV；XLPE绝缘；超高压；电力电缆---Theodore哈尔滨理工大学学士学位论文-IIAbstractWiththedevelopmentofsocialeconomyandthegrowingdemandforelectricity,citytransmissionsystemdevelopsgraduallyfromoverheadlinetothepowercable,powercablegraduallycometohavethehighervoltage,largertransmissioncapacity,theapplicationof500kVultra-highvoltagepowercablesgraduallyexpand.ButatpresentthedesignofdomesticEHVcablesandaccessoriescapacity,constructionandoperationofresearchisstillrelativelyweak,thecorrespondingtechnicalisdifficulttokeepupwiththespeedofdevelopment.Thedesignofultra-highvoltagepowercablematerialandproductionisfacedwithmanyproblems,Thedesignandresearchofultra-highvoltagepowercableareattheimminent.Thispaperdescribestheresearchbackgroundandsignificanceof500kVcable,introducingthedevelopmentstatusathomeandabroadandfocusingontheunderstandingleveloftheprocessinJapan.Wealsocomparethetypicalstructureofthe500kVsinglecorecables,theoil-filledcableandXLPEcables,theperformancedemandfortheproductionofXLPEpolyethylenematerialanddescribetheneedswhichmeettherelatedproblems.WeoverviewthesignificanceoftheshieldinglayerofbufferlayerofEHVcableandtheselectionandproductionprocessofmetalsheathindetail,aswellastheproblemsrelatedtoperformancerequirementsofprotectivelayerofEHVcableandthesignificanceofwaterresistance,wealsobrieflyintroducesthecalculatingoftheloadflow.FinallywecanknowtheadvantagesofXLPEcablebycomparingwithoil-filledcable.AndwebelievethatitwillbethetrendforEHVdevelopment.Inthispaperweintroducethematerialselectionandstructureindetails,hopingthatitcanprovidesomehelpfordesignandproductionofXLPEcable.Keywords500kV；XLPEinsulationcable；EHV；Powercable哈尔滨理工大学学士学位论文-III目录摘要......................................................................................................................IAbstract...............................................................................................................II第1章绪论........................................................................................................11.1课题背景...................................................................................................11.2国内外研究动态.......................................................................................21.2.1国内500kVXLPE绝缘电力电缆及其附件发展状况.....................31.2.2日本500kVXLPE绝缘电力电缆发展状况.....................................71.3本文主要研究内容.................................................................................10第2章500kV超高压电力电缆......................................................................112.1500kV超高压电力电缆..........................................................................112.2500kVXLPE绝缘电力电缆的结构........................................................152.3超高压电力电缆各部分结构及选材.....................................................162.3.1超高压电缆导体的选择...................................................................162.3.2超高压电缆导体的结构...................................................................182.3.3超高压电缆的绝缘层.......................................................................222.3.4超高压电缆的屏蔽层.......................................................................262.3.5超高压电缆的缓冲层.......................................................................272.3.6超高压电缆的金属护套挤出工艺...................................................292.3.7超高压电缆的护层...........................................................................342.3.8超高压电缆的阻水...........................................................................362.4本章小结.................................................................................................40第3章电缆的电气参数计算..........................................................................413.1电缆载流量计算的必要性.....................................................................413.2载流量计算的基本原理.........................................................................423.3稳态载流量的计算原理.........................................................................433.3.1电缆的几种敷设方式.......................................................................453.3.2导体线芯焦耳损耗...........................................................................463.3.3绝缘介质损耗...................................................................................473.3.4金属护套损耗...................................................................................48哈尔滨理工大学学士学位论文-IV-3.3.5电缆的热阻计算...............................................................................493.3.6稳态载流量计算流程.......................................................................503.4本章小结..........................