0000000000149727

AUTHOR

A.e. Emanuel

showing 6 related works from this author

Current transformers effects on the measurement of harmonic active power in LV and MV networks

2011

The harmonic active power is used to determine the location of polluting loads, the direction of harmonic power flow and to estimate how consequential a certain current harmonic source is. The highest uncertainties, when measuring harmonic active power, are introduced by the current and voltage transducers. This paper presents experimental results which show the impact of current transformers (CTs) on the accuracy of the harmonic power measurements. An expression for the evaluation of the power error in distorted conditions was developed which can be easily utilized in the case of linear current transducers. It is shown how CTs cannot be considered linear transducers and how the higher the …

instrument transformersEngineeringVoltage and current harmonicsSwitched-mode power supplyAcousticsActive powerTransducersEnergy Engineering and Power TechnologyLinear currentsPower factorHarmonic powerLinear transducersPower errorsPower transformersVoltage transducersHarmonic analysisHarmonic analysisMaximum valuesCurrent transformerElectrical and Electronic EngineeringPower measurementPhase anglesAbsolute valuesHarmonic power flowTotal harmonic distortionbusiness.industryElectric power distributionCurrent harmonicsElectrical engineeringAC powerCurrent transformerMV networksHarmonicsAccuracy classElectric instrument transformersHarmonicPower system harmonicsCurrent transformers (CTs) instrument transformerspower measurement power system harmonics.businessSettore ING-INF/07 - Misure Elettriche E Elettroniche
researchProduct

Characterization and Error Compensation of a Rogowski Coil in the Presence of Harmonics

2011

This paper reports the results of an experimental study dealing with a commercial Rogowski coil current transducer (RCCT) in the presence of harmonic distortion. The RCCT was observed under two conditions: 1) sinusoidal excitation with frequencies from 50 to 750 Hz and 2) nonsinusoidal excitation using fundamental frequency and one harmonic, with adjustable amplitude and phase shift. The experimental results show only a weak dependence of the harmonic current ratio error and phase displacement on the amplitude and phase shift of the excitation harmonic. The phase displacement is also independent of the conductor position within the Rogowski coil window. An error compensation method, based o…

PhysicsTotal harmonic distortionFrequency responsebusiness.industryAcousticsElectrical engineeringFundamental frequencycurrent transducerRogowski coilCurrent measurement current transducer frequency response harmonic distortion power system harmonics Rogowski coil.harmonic distortionHarmonic analysisAmplitudeHarmonicsHarmonicpower system harmonicElectrical and Electronic EngineeringbusinessInstrumentationSettore ING-INF/07 - Misure Elettriche E ElettronicheRogowski coil
researchProduct

Characterization of clamp-on current transformers under nonsinusoidal conditions

2009

This paper reports the performance of clamp-on current transformers under nonsinusoidal conditions. A set of experimental measurements helped to determine the ratio and the phase errors under two conditions: 1) sinusoidal excitation with frequencies from 45 to 1000 Hz and 2) nonsinusoidal excitation using the fundamental frequency and one harmonic, with adjusted phase shift. It was found that ratio and phase errors are affected by the phase angle between the harmonic and the fundamental and the harmonic amplitude. The effects of conductor location in the current transformer's window and of the air-gap width were also investigated. It was concluded that harmonic phase and ratio errors measur…

Frequency responseMaterials scienceElectric current measurementTransductorAcousticsErrorsTransducersPhase (waves)Energy Engineering and Power TechnologyClamp-on current transformers current transformers (CTs) frequency response power system harmonics transducers.Power transformersDistributed power generationElectric power systemsHarmonic analysisElectric power transmission networksClamp-on current transformersCurrent transformersFrequency responsePower electronicsFrequency measurementElectronic engineeringElectrical and Electronic EngineeringElectrical conductorTomographyComputed tomographyElectric power distributionElectric transformersCircuit faultsFault currentsFundamental frequencyComputerized tomographyFourier seriesCurrent measurementCurrent transformerDiagnostic radiographyElectric instrument transformersElectric frequency measurementPower system harmonicsMedical imagingCurrent transformers (CTs)Air gap (plumbing)Power transmissionElectric network analysisExcitation
researchProduct

Frequency response of Measurement Current Transformers

2008

In this paper the frequency response of two CTs is experimentally evaluated in the range of 30-600 Hz. A theoretical analysis of CTs behavior has been developed by means of the equivalent circuit. It was shown, by an experimental test, that, for the frequency range analyzed, the transformer equivalent circuit is a valid tool for the evaluation of CT performances.

Frequency responseTotal harmonic distortionMaterials scienceTransducerlawPower system harmonicsElectronic engineeringEquivalent circuitIec standardsTransformerCurrent transformerHardware_LOGICDESIGNlaw.invention2008 IEEE Instrumentation and Measurement Technology Conference
researchProduct

A novel approach to current transformer characterization in the presence of harmonic distortion

2009

The current transformer (CT) performance under distorted waveform conditions is usually characterized by means of the frequency-response test. In this paper, a new way to characterize CTs, closer to real operation conditions, is proposed. The harmonic phase-angle and ratio errors are measured using a nonsinusoidal current composed of fundamental and one harmonic with adjustable phase shift. The new method was tested by determining the performance of two metering class CTs commonly used by the Italian power company. The errors measured using the proposed approach are larger than the ones obtained with the frequency response. This result suggests that the frequency-response approach for the e…

EngineeringFrequency responseElectric current measurementAcousticsElectric transformer testingErrorsElectric utilitiesOperation conditionsHarmonic distortionPower companiesHarmonic analysisElectric power transmission networksFrequency responsePower electronicsWaveformMetering modeCurrent transformer (CT)Electrical and Electronic EngineeringInstrumentationNon-sinusoidal currentsPiezoelectric transducersTotal harmonic distortionbusiness.industryElectric power distributioncurrent transformer frequency response harmonic distortion power system harmonics transducersCurrent transformerRatio errorsTransducerElectric instrument transformersHarmonicPower system harmonicsCurrent (fluid)businessPower transmissionSettore ING-INF/07 - Misure Elettriche E ElettronicheDistorted waveforms
researchProduct

Characterization of Current Transformers in the Presence of Harmonic Distortion

2008

The CTs performance under distorted conditions are usually characterized by means of the frequency response test. In this paper a new way to characterize CTs, closer to real operative conditions, is proposed. The harmonic phase angle and ratio errors are measured when the CTs are excited with a nonsinusoidal current composed of a fundamental and one harmonic, with adjustable phase shift. The errors measured using the new approach were found larger than the ones obtained with the frequency response. This suggests that frequency response is not a reliable method to evaluate the CT performance under distorted conditions.

PhysicsFrequency responseTotal harmonic distortionTransducerAcousticsExcited stateHarmonicHarmonic phaseCurrent transformerCharacterization (materials science)
researchProduct