ApplicationReportSLAA466–September2010ANumericalProtectionRelaySolutionKaustubhGadgil...........................................................................................High-PerformanceAnalogABSTRACTNumericalProtectionRelays(NPRs)arecriticalelementsinanypowerdistributionnetwork.Generally,thereareseveraldifferenttypesofNPRs.Eachtype,however,sharesasimilararchitecture,thusenablingdesignerstobuildanentiresystemsolutionthatisbasedonarelativelysmallnumberofflexiblecomponents.ThisapplicationnotedemonstrateshowanNPRcanbeimplementedusingTI'sextensiveportfolioofsemiconductordevices.Contents1Introduction..................................................................................................................12SpeedRequirements.......................................................................................................23AccuracyRequirements....................................................................................................34SimultaneousSamplingRequirements..................................................................................45ComponentSelection.......................................................................................................46Conclusion...................................................................................................................67References...................................................................................................................6ListofFigures1TypicalSubstationinElectricalEnergyDistributionNetwork.........................................................22ExampleIDMTLCurve:Long-Time,ExtremelyInverseDelay........................................................33SimultaneousSamplingRequirementofTwoInputSignalsinanNPR.............................................44TypicalMulti-ChannelOvercurrentProtectionRelay...................................................................45ProposedNPRSolution.....................................................................
