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1、THERMALANALYSISOFMINIATURECIRCUITBREAKERABSTRACTWiththecontinuousdevelopmentofindustryandimprovementofpowertransmissionanddistributionsystemcapacity,therequestfortheswitchofthelowvoltageapparatusismorestrictly.Inordertoimprovethespaceefficiencyoftheswitchingdevice,a
2、notherrequestfortheswitchstructurecomesoutthatistherequirementofminiaturizationdcsign.Switchingapparatusminiaturizationdesignmakesproductscoolingareareduced,andthecomponentsoftheheatingmaketheunitvolumeheatquantityincrease,ithasbadinfluenceonthesafetyandreliabilityo
3、fswitchequipment.Sohowtomaketheelectricalproductsmeetthethermalrequirementsinminiaturizedcondition,atthesametime,improvetheworkperformanceisthekeyproblemtobesolvedurgently.New-styleminiaturecircuitbreakerastheimportantcomponentofadvancedpowerdistributionsystemhasawi
4、derangeofapplication,withsmallvolumeandcompactstructurecharacteristics,itsworkingtemperaturedistributiondirectlyinfluencestheaerospaceequipmentdistributionsystemreliability.Therefore,theimportanceofitsworkingtemperaturedistributionisself-evident.Inthispaper,itillust
5、ratesthe3Dtemperaturesimulatingandthermalanalysisonanew-styleminiaturecircuitbreakerastheresearchobjectbyusingtheanalysissoftwareANSYSbasedonthefiniteelementmethod,andgetsthecomponentstemperaturedistribution.Anotherresultisthatitobtainsthedeformationofthebimetallics
6、tripaccordingtothetemperaturesimulationresult.Finally,thecalculationresultsarccomparedwiththeexperimentalresults.Basedonthetemperatureandthedeformationresultofthesimulation,wecanputforwardtheimprovementdesign,toachievethesatisfactoiyresultoftemperaturedistribution,t
7、oreduceproductdesignperiodandimprovethedesignlevel.KEYWORDS:circuitbreaker,temperaturefieldsimulation,bimetallicstrip目录第一章绪论1§1-1课题研究的背景及意义1§1-2低压断路器的发展2§1-3热分析技术的发展介绍51-3-1热分析计算方法51-3-2当前流行的热分析软件6§1-4国内外研究状况8§1-5本课题研究内容10第二章传热学与ANSYS计算理论11§2-1传热的基本方式及其定律112-1-1热传递的
8、三种形式112-1-2导热的三类边界条件122-1-3温度场的变分及离散13§2-2ANSYS计算理论162-2-1ANSYS软件功能介绍162-2-2有限元法的数学理论162-2-3ANSYS热耦合场计算18§2-3小结18第三章电器导体发热计算19§3-1电器的允许温升1
