偏磁式消弧线圈瞬态漏磁场计算和损耗分析

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1、ThesisSubmittedtoHebeiUniversityofTechnologyforTheMasterDegreeofElectricalEngineeringTRANSIENTLEAKAGEMAGNETICFIELDCALCULATIONANDLOSSANALYSISOFARC-SUPPRESSIONCOILWITHMAGNETICBIASByYangTingtingSupervisor:Prof.WangYouhuaNovember2011河北工业大学硕士学位论文偏磁式消弧线圈的瞬态漏磁场计算

2、与损耗分析摘要电力系统如果采用中性点不接地的运行方式，则电容电流的不断增加会对设备绝缘的安全和保护设备的配备带来严重影响。当系统电容电流超过10A时，中性点需经消弧线圈接地。在偏磁式消弧线圈的设计过程中，漏磁场的分布与铁心损耗是重要的参考指标。本文简要阐述了三维涡流场有限元分析理论，介绍了商用电磁分析软件MagNet。通过软件分析，获得了漏磁场和涡流损耗的分布情况；并基于VisualBasic6.0开发了在MagNet软件中的瞬态场值提取专用程序，用于分析铁心的磁滞损耗；还使用了Matlab软件分析了绕组在

3、一个周期内的电流波形的谐波含量。关键词：偏磁式消弧线圈，瞬态漏磁场，涡流损耗，磁滞损耗，电流谐波含量分析i偏磁式消弧线圈的瞬态漏磁场计算与损耗分析TRANSIENTLEAKAGEMAGNETICFIELDCALCULATIONANDLOSSANALYSISOFARC-SUPPRESSIONCOILWITHMAGNETICBIASABSTRACTInthepowersystemwhichtheneutralpointisnotgrounded,ifthecapacitorcurrentisincreasing

4、toonepoint,therewillhaveseriousinfluenceforthesafetyofinsulationequipmentandprotectionequipment.Whenthecapacitorcurrentexceedsto10A,theneutralpointneedtobegroundedthroughanarc-suppressioncoil.Intheprocessofdesigningthearc-suppressioncoilwithmagneticbias,th

5、edistributionofleakagemagneticfieldandthelossofcoreareveryimportantreferenceindexes.Inthispaper,thetheoriesoffiniteelementanalysison3Dfiledareillustratedinbriefly.Thecommercialelectromagneticanalysissoftwarewhichisnamed“MagNet”isintroduced.UsingtheMagNet,t

6、heauthorcalculatedthe

7、B

8、andeddycurrentlossin3Dtransientfield.BasingontheVisualBasic6.0,theauthorcompiledthespecialprogramforgettingtheinstantaneousvaluesofB,whichisusedtoanalyzethehysteresisloss.Besides,thecurrentharmoniccontentinaperiodwasanalyzedbyMatlab

9、.KEYWORDS:arc-suppressioncoilwithmagneticbias,leakagemagneticfield,eddycurrentloss,hysteresisloss，currentharmonicanalysisii河北工业大学硕士学位论文目录第一章绪论..................................................................................................................

10、...........1§1-1课题的研究背景......................................................................................................................1§1-2消弧线圈的发展现状.....................................................