關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)

關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)現(xiàn)在是1頁\一共有36頁\編輯于星期五Minimumclearance(Table2)RatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0現(xiàn)在是2頁\一共有36頁\編輯于星期五HowtofindtheminimumclearanceHouseholdapplianceareinovervoltagecategoryIISelecttheratedvoltageUsingthetable1tofindouttheratedimpulsevoltageAccordingtotable2,theminimumclearancecouldbefoundbyratedimpulsevoltageTheclearancesoffourinsulationtypes:BasicinsulationSupplementaryinsulationReinforcedinsulationFunctionalinsulation現(xiàn)在是3頁\一共有36頁\編輯于星期五TheclearanceofbasicinsulationExample1 :WaterkettleRating :220–240V50Hz2500–3000WRatedvoltageVRatedimpulsevoltage(V)OvervoltagecategoryIIIIII<=50330500800>150and<=15080015002500>150and<=300150025004000220–240VUsingcategoryIITheratedimpulsevoltagewas2500V現(xiàn)在是4頁\一共有36頁\編輯于星期五29.1.1clearancesofbasicinsulationRatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0Theminimumclearancesofbasicinsulationwas1.5mm現(xiàn)在是5頁\一共有36頁\編輯于星期五Specialcomponentsforbasicinsulation

Theterminalsoftubularsheathedheatingelementscounted1mm,ifthemicroenvironmentispollutiondegree1.>1mmTubularsheathedheatingelementPollutiondegree1現(xiàn)在是6頁\一共有36頁\編輯于星期五29.1.2clearanceofsupplementinsulationTheminimumclearanceissameasthebasicinsulationThedistancebetweenenclosureandinternalwire現(xiàn)在是7頁\一共有36頁\編輯于星期五29.1.3clearanceofreinforcedinsulationThereinforcedinsulationusingthenextstepforratedimpulsevoltage.Betweenterminalandplasticenclosure現(xiàn)在是8頁\一共有36頁\編輯于星期五29.1.4clearanceoffunctionalinsulation

BetweenterminalsThefunctionalinsulationisbetweenlivepartsofdifferentpotential現(xiàn)在是9頁\一共有36頁\編輯于星期五PTCHeatingelementHairstraighterPTCheaterHairstraighterassembly現(xiàn)在是10頁\一共有36頁\編輯于星期五DifferenttypesofPTCHeatingelements現(xiàn)在是11頁\一共有36頁\編輯于星期五InternalconstructionofPTCheatingelementTheclearancebetweensurfacesofPTCheatingelementsmaybereducedto1mmTheclearance>=1mmKaptonfilmPTCheatingplateElectrodeplate現(xiàn)在是12頁\一共有36頁\編輯于星期五29.2creepagedistancesStep1(Tofindoutthepollutiondegree)Pollutiondegree2appliesunlessPrecautionshavebeentakentoprotecttheinsulation,inwhichcasepollution1appliesTheinsulationissubjectedtoconductivepollution,inwhichcasepollutiondegree3appliesNote:Thepollutiondegreeshouldneedrefertopart2.現(xiàn)在是13頁\一共有36頁\編輯于星期五StandardPollutiondegree60335–2–3II60335–2–9III60335–2–14III60335–2–15III60335–2–23II60335–2–80IIIPollutiondegreeclassification現(xiàn)在是14頁\一共有36頁\編輯于星期五Trackingindex(CTI)valuesMaterialgroupI:600<=CTIMaterialgroupII:400<=CTIMaterialgroupIIIa:175<=CTI<400MaterialgroupIIIb:100<=CTI<175Step2(Tofindoutthematerialgroup)

Trackingindextester現(xiàn)在是15頁\一共有36頁\編輯于星期五Trackingindex(CTI)values現(xiàn)在是16頁\一共有36頁\編輯于星期五MinimumcreepagedistancesforbasicinsulationWorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.91.21.51.71.9a>50and<=1250.30.81.11.51.92.12.4>125and<=2501.61.31.82.53.23.64.0>250and<=4001.02.02.84.05.05.66.3>400and<=5001.32.53.65.06.37.18.0>500and<=8001.83.24.56.38.09.010.0現(xiàn)在是17頁\一共有36頁\編輯于星期五ThecreepageofbasicinsulationExample1:WaterkettleRating:220–240V50Hz2500–3000WPollutiondegree3(refertostandard60335–2–15)Themicroenvironmentispollutiondegree3iftheinsulationcanbe pollutedbycondensationfromsteamproducedduringnormaluseof appliance.AssumethematerialgroupisIII(thetightengrade)Workingvoltageisbetween>125and<=250現(xiàn)在是18頁\一共有36頁\編輯于星期五ThecreepageofbasicinsulationWorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.91.21.51.71.9a>50and<=1250.30.81.11.51.92.12.4>125and<=2501.61.31.82.53.23.64.0>250and<=4001.02.02.84.05.05.66.3>400and<=5001.32.53.65.06.37.18.0>500and<=8001.83.24.56.38.09.010.0現(xiàn)在是19頁\一共有36頁\編輯于星期五WorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.81.11.41.61.8a>50and<=1250.30.71.01.41.82.02.2>125and<=2500.41.01.42.02.52.83.2>250and<=4000.81.62.23.24.04.55.0>400and<=5001.02.02.84.05.05.66.3>500and<=8001.83.24.56.38.09.010.0Minimumcreepagedistancesforfunctionalinsulation現(xiàn)在是20頁\一共有36頁\編輯于星期五InsulationtypeDistanceBasicinsulation4Supplementaryinsulation4Reinforcedinsulation8Functionalinsulation3.2SummaryofMinimumcreepagedistances

現(xiàn)在是21頁\一共有36頁\編輯于星期五29.2.1creepageforbasicinsulation

Lacqueredconductorsofwindings1.5mmCreepagedistanceofwindingneednotbegreaterthantheassociatedclearancespecifiedintable16現(xiàn)在是22頁\一共有36頁\編輯于星期五

Asperclause29.2.2,thecreepagedistanceofsupplementaryinsulationshallnotlessthanand2.5mm.Theinternalwireofmicro-switchwasnotsecurelyfixedthatitwaspossibletobetouchedbytestfingerwith2Nforce.Thecreepagedistanceweremeasuredas0mmInternalwireshallbeaccess現(xiàn)在是23頁\一共有36頁\編輯于星期五

Thecreepagedistancesofreinforcedinsulationshallnotlessthan8mm.Asresult,thecreepagedistancewasmeasured7.5mmbetweenleadsofneonlampandthelampcoverjoint.

LeadsofneonlampLensEnclosureLeonlampleads2mm3mm2.5mThecreepagedistances=2.5+2+3 =7.5mm現(xiàn)在是24頁\一共有36頁\編輯于星期五

29.2.4creepagedistancesoffunctionalinsulationCreepagedistancebetweenMeasuredresultsLimitationSwitchterminals1.5mm2mm1.5mm現(xiàn)在是25頁\一共有36頁\編輯于星期五DistancebetweenMeasuredresultsLimitationPCBBetweenPointAandBClearanceCreepageClearanceCreepage2.07mm2.75mm1.5mm2.0mm現(xiàn)在是26頁\一共有36頁\編輯于星期五PCBTrackABBABA現(xiàn)在是27頁\一共有36頁\編輯于星期五29.2.4creepagedistanceforfunctioninsulationCreepagedistancesmaybereducediftheappliancecomplieswithclause19withthefunctionalinsulationshort-circuited.Forexample:ElectroniccomponentElectroniccomponentThetransistorleads<limitationofcreepagedistance現(xiàn)在是28頁\一共有36頁\編輯于星期五LivePartSupplementaryinsulation(1mm)Basicinsulation29.3.1Materialthicknessrequirementforsupplementaryinsulation(1)SupplementaryInsulation現(xiàn)在是29頁\一共有36頁\編輯于星期五LivePartReinforcedinsulation(2mm)29.3.1Materialthicknessrequirementforreinforcedinsulation(1)ReinforcedInsulation現(xiàn)在是30頁\一共有36頁\編輯于星期五LivePart1stlayerinsulation2ndlayerinsulationEachofthelayersshouldwithstandsthe