




已阅读5页,还剩32页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
Clause29Clearances Creepagedistancesandsolidinsulation爬电距离 电气间隙和绝缘穿通距离 Table1 Minimumclearance Table2 Howtofindtheminimumclearance HouseholdapplianceareinovervoltagecategoryIISelecttheratedvoltageUsingthetable1tofindouttheratedimpulsevoltageAccordingtotable2 theminimumclearancecouldbefoundbyratedimpulsevoltage Theclearancesoffourinsulationtypes BasicinsulationSupplementaryinsulationReinforcedinsulationFunctionalinsulation Theclearanceofbasicinsulation Example1 WaterkettleRating 220 240V50Hz2500 3000W 220 240V UsingcategoryII Theratedimpulsevoltagewas2500V 29 1 1clearancesofbasicinsulation Theminimumclearancesofbasicinsulationwas1 5mm Specialcomponentsforbasicinsulation Theterminalsoftubularsheathedheatingelementscounted1mm ifthemicroenvironmentispollutiondegree1 1mm Tubularsheathedheatingelement Pollutiondegree1 29 1 2clearanceofsupplementinsulation Theminimumclearanceissameasthebasicinsulation Thedistancebetweenenclosureandinternalwire 29 1 3clearanceofreinforcedinsulation Thereinforcedinsulationusingthenextstepforratedimpulsevoltage Betweenterminalandplasticenclosure 29 1 4clearanceoffunctionalinsulation Betweenterminals Thefunctionalinsulationisbetweenlivepartsofdifferentpotential PTCHeatingelement Hairstraighter PTCheater Hairstraighterassembly DifferenttypesofPTCHeatingelements InternalconstructionofPTCheatingelement TheclearancebetweensurfacesofPTCheatingelementsmaybereducedto1mm Theclearance 1mm Kaptonfilm PTCheatingplate Electrodeplate 29 2creepagedistances Step1 Tofindoutthepollutiondegree Pollutiondegree2appliesunlessPrecautionshavebeentakentoprotecttheinsulation inwhichcasepollution1appliesTheinsulationissubjectedtoconductivepollution inwhichcasepollutiondegree3appliesNote Thepollutiondegreeshouldneedrefertopart2 Pollutiondegreeclassification Trackingindex CTI valuesMaterialgroupI 600 CTIMaterialgroupII 400 CTIMaterialgroupIIIa 175 CTI 400MaterialgroupIIIb 100 CTI 175 Step2 Tofindoutthematerialgroup Trackingindextester Trackingindex CTI values Minimumcreepagedistancesforbasicinsulation Thecreepageofbasicinsulation Example1 WaterkettleRating 220 240V50Hz2500 3000W Pollutiondegree3 refertostandard60335 2 15 Themicroenvironmentispollutiondegree3iftheinsulationcanbepollutedbycondensationfromsteamproducedduringnormaluseofappliance AssumethematerialgroupisIII thetightengrade Workingvoltageisbetween 125and 250 Thecreepageofbasicinsulation Minimumcreepagedistancesforfunctionalinsulation SummaryofMinimumcreepagedistances 29 2 1creepageforbasicinsulationLacqueredconductorsofwindings 1 5mm Creepagedistanceofwindingneednotbegreaterthantheassociatedclearancespecifiedintable16 Clause29 2 2 Asperclause29 2 2 thecreepagedistanceofsupplementaryinsulationshallnotlessthanand2 5mm Theinternalwireofmicro switchwasnotsecurelyfixedthatitwaspossibletobetouchedbytestfingerwith2Nforce Thecreepagedistanceweremeasuredas0mm Internalwireshallbeaccess Clause29 2 3 Thecreepagedistancesofreinforcedinsulationshallnotlessthan8mm Asresult thecreepagedistancewasmeasured7 5mmbetweenleadsofneonlampandthelampcoverjoint Leadsofneonlamp Lens Enclosure Leonlampleads 2mm 3mm 2 5m Thecreepagedistances 2 5 2 3 7 5mm 29 2 4creepagedistancesoffunctionalinsulation 1 5mm Clause29 2 4 PCBTrack AB BA BA 29 2 4creepagedistanceforfunctioninsulation Creepagedistancesmaybereducediftheappliancecomplieswithclause19withthefunctionalinsulationshort circuited Forexample Electroniccomponent Electroniccomponent Thetransistorleads limitationofcreepagedistance LivePart Supplementaryinsulation 1mm Basicinsulation 29 3 1Materialthicknessrequirementforsupplementaryinsulation 1 SupplementaryInsulation LivePart Reinforcedinsulation 2mm 29 3 1Materialthicknessrequirementforreinforcedinsulation 1 ReinforcedInsulation LivePart 1stlayerinsulation 2ndlayerinsulation Eachofthelayersshouldwithstandstheelectricstrengthtestforsupplementaryinsulation 29 3 2Materialrequirementforsupplementaryinsulation 2 Basicinsulation 29 3 2Materialrequirementforreinforcedinsulation 2 LivePart 1stlayerinsulation 2ndlayerinsulation 3rdlayerinsulation Anytwolayerstogethershouldwithstandstheelectricstrengthtestforreinforcedinsulation 1mm Case1 Clearance Creepagedistance 1mm Case2 Clearance Creepagedi
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 高校护照管理办法
- 三星级酒店管理办法
- odi备案管理办法
- 海曙区疫情管理办法
- 五个全科化管理办法
- 二维码巡检管理办法
- 积分制动态管理办法
- 深圳干细胞管理办法
- 森林检疫证管理办法
- 业余俱乐部管理办法
- YY/T 1794-2021口腔胶原膜通用技术要求
- GB/T 4548-1995玻璃容器内表面耐水侵蚀性能测试方法及分级
- GB/T 3730.2-1996道路车辆质量词汇和代码
- GB/T 33365-2016钢筋混凝土用钢筋焊接网试验方法
- GA/T 1393-2017信息安全技术主机安全加固系统安全技术要求
- GA 304-2012塑料管道阻火圈
- 螺旋藻片的10大销售话术(附4个联合用药方案)
- 老年肌肉衰减综合征(肌少症)课件
- 食堂从业人员健康情况晨检记录表
- 冷却系统橡胶软管设计基础规范
- 地源热泵埋管冬夏季换热平衡计算
评论
0/150
提交评论