湖北工业大学断线保护装置对人身和设备的保护考试科目电力工程研究生姓名雷凌峰学号120150195任课教师丁稳房学院、专业电院高电压与绝缘技术成绩二0一六年6月20日I摘要随着经济的快速发展，社会的不断进步和人民生活的日益改善，工业和民用建筑、办公楼及居民住宅等场所的用电数量呈快速增长态势，负载的性质也发生了较大的变化。随着三相四线制供电里中性线的作用越来越重要，如何确保它的合理选择与正常运行已成为日常供用电工作的重点。本文对其各种文献的内容进行了整理和整合，叙述了三相四线制供电系统里中性线的作用和其断线后的各种情况及原因。对中性线、地线以及零线进行了区分，并分析其之间的联系和发生中性线断线后所会引起的各种危害。最后，主要对三相四线制供电系统中就中性线发生断线的情况进行分析。通过分析如何计算中性线的电流以及中性点位移和谐波电流引起中性线故障的过程，进而得出应该如何合理正确的选择中性线以及如何正确安装中性线，并找出预防中性线断线的措施。关键词：三相四线制中性线断线保护措施IIAbstractWiththeamountofelectricitytherapideconomicdevelopment,socialprogressandimprovingpeople'slivesincreasingly,industrialandcivilconstruction,residentialandofficebuildingsandotherplacesisgrowingrapidly,thenatureoftheloadhasalsoundergonegreatchanges.Withthethree-phasefour-wirepowersupplyintheincreasinglyimportantroleofneutralline,howtomakesureit'sareasonablechoiceandthenormaloperationoftheelectricitysupplyhasbecomethefocusofdailywork.Inthispaper,thecontentsofvariousdocumentswereconsolidatedandintegration,describedtheroleofthethree-phasefour-wirepowersupplysystemanditsvariousneutralandthereasonsafterthebreak.Toneutral,andgroundzerolineadistinction,andanalyzetherelationshipbetweenthemandtheneutrallineaftertheoccurrenceofvarioushazardsthatwillcausethebreak.Finally,themainthree-phasefour-wirepowersupplysystemanalyzedfortheoccurrenceoftheneutrallinedisconnected.Byanalyzingtheprocessofhowtocalculatetheneutralcurrentandneutraldisplacementandharmoniccurrentscausedbyneutralfault,thencomerightchoicehowreasonabletheneutrallineandhowtoinstallthecorrectneutrallineandfindoutpreventionmeasuresneutrallinedisconnected.KeyWords：three-phasefour-wiresystemneutrallinebreaksafeguardIII目录摘要..........................................................错误！未定义书签。Abstract......................................................错误！未定义书签。第1章绪论...................................................错误！未定义书签。第2章中性线断线的危害.......................................错误！未定义书签。2.1中性线（零线）和地线..................................错误！未定义书签。2.2中性线在三相四线制供电系统中的作用及中性线断线的危害..错误！未定义书签。2.2.1中性线的作用....................................错误！未定义书签。2.2.2中性线的危害....................................错误！未定义书签。2.3中性线断线的原因分析..................................错误！未定义书签。第3章电气安全装置...........................................错误！未定义书签。3.1低压配电系统保护装置..................................错误！未定义书签。3.2电流型漏电保护装置的选择和应用........................错误！未定义书签。第4章中性线断线的预防、保护措施.............................错误！未定义书签。4.1保护接零..............................................错误！未定义书签。4.2中性点制度.............................................................64.3预防措施..............................................错误！未定义书签。4.4保护措施...................................................
