泄漏电流(英文演示稿)讲课讲稿.ppt

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1、泄漏电流(英文演示稿)Touch(Leakage)CurrentTopicsDefinitions(UL101,IEC60990)TouchcurrentpathsPhysiologicaleffectsoftouchcurrent(electricshock)Bodyimpedancemodelsand“safe”voltagelimitsTouch(Leakage)CurrentTestTouchcurrentinstruments(meters)MeasurementcircuitsandproceduresLimits2DEFI

2、NITIONSLEAKAGECURRENT(UL101-2002):Electriccurrentwhichflowsthroughapersonuponcontact,betweenaccessiblepartsofanapplianceand(1)ground,or(2)otheraccessiblepartsoftheapplianceTOUCHCURRENT(IEC60990):Electriccurrentthroughahumanbodyorananimalbodywhenittouchesoneormoreaccessib

3、lepartsofaninstallationorofequipment.3Touch(Leakage)CurrentPathsAccessiblemetalLoadLoadElectricalinsulationSystemLNG+_VSUngroundedConductorGroundedConductorGrounding(protectiveearthing)Conductor?TouchcurrentReturnPath4TouchCurrentPathsLoadLoadExample:Ungrounded2wireCorda

4、ndPlug-ConnectedAppliancestouchablemetalElectricalInsulationSystemToElectricalSupply5CanopenerToasterovenTVradioCoffeemakerironblenderExamplesof2-wireNon-GroundedAppliances6TouchCurrentPathsGroundedapplianceTouchablemetalLoadLoadUngrounded2wireapplianceTouchableMetalofGr

5、oundedAppliancesElectricalinsulationSystemEquipmentGroundingConductor(protectiveearthingconductor)GLNG+_VSUngroundedConductorGroundedConductorGrounding(protectiveearthing)ConductorTouchCurrentTouchablemetalReturnPaths-17dishwasherrangemicrowaverefrigeratorExamplesof3-wir

6、eGroundedAppliancesCanopenerToasterovenTVradioCoffeemakerironblenderExamplesof2-wireNon-GroundedAppliances8PlumbingFixturesConstructionGroundsMetallicPipingSystemBondingconnectiontowaterpipeTouchCurrentTouchablemetalTouchablemetalLoadLoadUngrounded2wireapplianceElectrica

7、linsulationSystemGLNG+_VSUngroundedConductorGroundedConductorGrounding(protectiveearthing)ConductorReturnPaths-2TouchCurrentPaths9SinkExamplesofConstructionGroundsBaseboardheatingExamplesof3-wireGroundedAppliancesExamplesof2-wireNon-GroundedAppliancesdishwasherrangemicro

8、waverefrigeratorCanopenerToasterovenTVradioCoffeemakerironblender10TouchCurrentPathsUngrounded2wireappl