81/229/INFForIECuseonly2003-07-25INTERNATIONALELECTROTECHNICALCOMMISSIONTECHNICALCOMMITTEENo.81:LIGHTNINGPROTECTIONLiaisonwithotherTC/SCandwithothersorganisationsJointtaskforcewithSC77B:“TostudythefitureuseofsurgesimulatorforSPDtesting”–Progressreport(tobediscussedunderdraftagendaitem12.1attheforthcomingTC81meetingtobeheldinPalmadeMallorca29thand30thSeptember2003)PROPOSALSFOLLOWINGTHEMEETINGOFJTF778–TC81HELDINNUERNBERG,MARCH52002(reportsubmittedbyMichaelHopkins)1)AMENDMENTTO61000-4-5ANNEXB12.2.2SystemlevelimmunityThetestcarriedoutinthelaboratoryreferstoanEUT,butimmunityattheEUTdoesnotnecessarilyassuretheimmunityofalargersystemwhichcontainsthatEUT.Inordertoensuresystemlevelimmunity,atestatthesystemlevelisrecommendedtosimulatetherealinstallation.ThissimulatedinstallationshallbecomprisednotonlyofindividualEUT's,butmustshallalsoincludeprotectivedevices(SurgeProtectiveDevices-SPD's)andthereal1engthandtypeoftheinterconnectionlinesnormallyused.allofwhichcanaffecttheoverallsystemprotectionlevel.ThesimpleadditionofanexternalSPDthatisnotcoordinatedwithotherinternalSPD's,mighthavenoeffect,mightreducetheeffectontheoverallsystemprotection,ormightimproveoverallsystemprotection.AdditionalinformationcanbefoundinIECSurgeProtectiveDevicesStandards.IEC61643andIEC61312(Protectionagainstlightningelectromagneticimpulse).ThistestisaimedatsimulatingascloselyaspossibletheinstallationconditionsinwhichtheEUTorEUT'sareintendedtofunction.Inarealinstallation,highervoltagelevelscanbeapplied.butthesurgeenergywillbelimitedbytheinstalledprotectivedevicesinaccordancewiththeircurrent-limitingcharacteristics.Thesystemleveltestisalsointendedtoshowthatsecondaryeffectsproducedbytheprotectivedevices(changeofwaveform,mode,amplitudeofvoltagesorcurrents)donotcauseunacceptableeffectsontheEUT.2)PROPOSEDADDITIONTOIEC61643-1ThenextreleaseshouldensurethatthecombinationwavegeneratorspecificationsfartestingClassIIISPD'sbealignedwithIEC61000-4-5.BecauseofthedifferencesintolerancespecifiedinIEC61000-4-5andIEC61...
