Fonksyonnman prensip nan bobin Rogowski ak intégrateur

Prensip fonksyoneRogowskicoilandintegrator

WorkingprincipleofRogowskicoil

ResevwaVelè ki gen yon diferans nan kouran an.Pwoteje sa ki enkòpore kontwole vòl la, kijan pou yo anrejistre sa ki nan anviwònman an.Sistèm ki gen anpil karakteristik nan tan reyèl la, mezi aktyèl, fasèt, ak preskripsyon, aksaturasyon.

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.