Kev ua haujlwm txoj haujlwm ntawm Rogowski coil thiab tus lej sib xyaw
Jul 20, 2020
Tso lus
Kev khiav hauj lwmprincipleofRogowskicoilandintegrator
Ua Hauj Lwm Tsis Muaj Qho Ua HaujlwmRogowskicoil
Rogowskicoilisanannularcoilwhichisuniformlywoundonanonferneticmaterial.Theoutputsignalisthedifferentialofcurrenttotime.Throughacircuitthatintegratestheoutputvoltagesignal, theinputcurrentcanbetrulyrestored.Thecoilhasthechaxhais yam tsis tseem ceeb.
Rogowskicoil, alsoknownascurrentmeasurementcoilanddifferentialcurrentsensor, ismainlyusedtomeasureACcurrent.TheworkingprincipleofRogowskicoilisthatthecoilskeletonsurroundstheconductorundertest.Themagneticfieldaroundtheconductorwillchangewiththechangeofcurrentintheconductor, andtheenameledwireontheskeletonwillinduceelectromotiveforce.Accordingtothemathematicalderivation, theEMFisdirectlyproportionaltothederivativeofthecurrentintheconductor, andtheproportionalcoefficientisrelatedtothenumberofturnsofthecoil, thecrosssectionoftheskeletonandthemagneticconductivity.ThecurrentintheconductorcanbereducedbyintegratingtheEMF.
Workingprincipleofintegrator
InordertoaccuratelyrestoretheoutputofinductionelectromotiveforceofRogowskicoiltothemeasuredACcurrentI, aninverseintegrationcircuitmustbeadded.BecausethevoltageinducedbyRogowskicoilisverysmall, inordertoamplifytheinducedvoltage, anamplifiercircuitmustbeaddedinfrontoftheintegrator.Integrationisaveryimportantlink.Thesignaltoberestoredisverysmall.Inordertofacilitatethemeasurement, thesignalshouldbeamplifiedandthenintegrated.Ontheonehand, therestoredsignalcanbeincreased.Ontheotherhand, theexistenceofcapacitancecanfilteroutunnecessaryinterference.TheintegratorcanrestorethemeasuredACcurrentbyamplifyingandintegratingtheinducedvoltageoftheRogowskicoil.
Ua Hauj Lwm Tsis Muaj Qho Ua HaujlwmRogowskicoil
Rogowskicoilisanannularcoilwhichisuniformlywoundonanonferneticmaterial.Theoutputsignalisthedifferentialofcurrenttotime.Throughacircuitthatintegratestheoutputvoltagesignal, theinputcurrentcanbetrulyrestored.Thecoilhasthechaxhais yam tsis tseem ceeb.
Rogowskicoil, alsoknownascurrentmeasurementcoilanddifferentialcurrentsensor, ismainlyusedtomeasureACcurrent.TheworkingprincipleofRogowskicoilisthatthecoilskeletonsurroundstheconductorundertest.Themagneticfieldaroundtheconductorwillchangewiththechangeofcurrentintheconductor, andtheenameledwireontheskeletonwillinduceelectromotiveforce.Accordingtothemathematicalderivation, theEMFisdirectlyproportionaltothederivativeofthecurrentintheconductor, andtheproportionalcoefficientisrelatedtothenumberofturnsofthecoil, thecrosssectionoftheskeletonandthemagneticconductivity.ThecurrentintheconductorcanbereducedbyintegratingtheEMF.
Workingprincipleofintegrator
InordertoaccuratelyrestoretheoutputofinductionelectromotiveforceofRogowskicoiltothemeasuredACcurrentI, aninverseintegrationcircuitmustbeadded.BecausethevoltageinducedbyRogowskicoilisverysmall, inordertoamplifytheinducedvoltage, anamplifiercircuitmustbeaddedinfrontoftheintegrator.Integrationisaveryimportantlink.Thesignaltoberestoredisverysmall.Inordertofacilitatethemeasurement, thesignalshouldbeamplifiedandthenintegrated.Ontheonehand, therestoredsignalcanbeincreased.Ontheotherhand, theexistenceofcapacitancecanfilteroutunnecessaryinterference.TheintegratorcanrestorethemeasuredACcurrentbyamplifyingandintegratingtheinducedvoltageoftheRogowskicoil.
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