Search results for "transformer"

showing 6 items of 96 documents

Metrological performances of voltage and current instrument transformers in harmonics measurements

2018

In the new electrical system scenario, the increasing presence of non-linear loads and renewable energy sources makes the measurement of harmonics an essential task. The accuracy of harmonic measurement firstly depends on the used instrument transformers for voltage and current sensing. Since the behavior of instrument transformers in non-sinusoidal conditions is not always well defined, this paper presents an experimental study on the metrological performances of current and voltage instrument transformers (CTs and VTs) in the presence of harmonics. Proper tests procedures are defined and measurement setups are developed for both CTs and VTs calibration. The analysis is carried out by usin…

instrument transformers020209 energy02 engineering and technologyInstrument TransformerHarmonic analysispower system meaurementsPhase AngleDistortionharmonics0202 electrical engineering electronic engineering information engineeringCalibrationElectronic engineeringMedicineSafety Risk Reliability and QualityInstrumentationbusiness.industry020208 electrical & electronic engineeringHarmonicPower System MeasurementcalibrationCurrent transformerMetrologyHarmonicsHarmonicbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltage
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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
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Design and Realization of a Bidirectional Full Bridge Converter with Improved Modulation Strategies

2020

In this paper a Full-Bridge Converter (FBC) for bidirectional power transfer is presented. The proposed FBC is an isolated DC-DC bidirectional converter, connected to a double voltage source&mdash

isolated DC-DC bidirectional converterComputer Networks and CommunicationsComputer science020209 energylcsh:TK7800-836002 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici7. Clean energySettore ING-INF/01 - Elettronicafull-bridge converterlaw.inventionFull bridge converterlaw0202 electrical engineering electronic engineering information engineeringElectronic engineeringMaximum power transfer theoremElectrical and Electronic EngineeringTransformerfull-bridge converter; isolated DC-DC bidirectional converter; phase shift modulation; supercapacitorssupercapacitors020208 electrical & electronic engineeringlcsh:Electronicsphase shift modulationHardware and ArchitectureControl and Systems EngineeringSignal ProcessingVoltageElectronics
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Simulation of a Power Line Communication System in Medium and Low Voltage Distribution Networks

2011

The aim of the paper is to study the influence of the power transformer on signal transmission in the case of a power line communication (PLC) system in a overhead Medium Voltage (MV) power network. A model of the PLC system was carried out by means of the Simulink® software. A distributed parameter MV overhead line, two power transformers, the signal coupling networks and the receiving and transmitting line coupling interface of a ST7540 FSK powerline transceiver were included in the model. The performances of the complete PLC communication system are evaluated for different line lengths by means of the attenuation computed as ratio between the received and transmitted voltage signals.

power line communicationEngineeringbusiness.industryElectrical engineeringpower transformerCommunications systemSignalLine (electrical engineering)overhead linepower system communicationPower-line communicationmedium voltagemedium voltage communication system power system communication overhead line communication equipment testing power line communication attenuationElectronic engineeringOverhead (computing)communication systembusinessLow voltageSettore ING-INF/07 - Misure Elettriche E ElettronicheOverhead lineattenuationcommunication equipment testingVoltage
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PQ and Harmonic Assessment Issues on Low-Cost Smart Metering Platforms: A Case Study

2020

This paper presents a feasibility study on how to implement power quality (PQ) metrics in a low-cost smart metering platform. The study is aimed at verifying the possibility of implementing PQ monitoring in distribution networks without replacing existing smart metering devices or adding new modules for PQ measurements, thus zeroing the installation costs. To this aim, an electronic board, currently used for remote energy metering, was chosen as a case study, specifically the STCOMET platform. Starting from the specifications of this device, the possibility of implementing power quality metrics is investigated in order to verify if compliance with standard requirements for PQ instruments ca…

smart meterSmart meterComputer science020209 energy02 engineering and technologylcsh:Chemical technologyBiochemistryArticleAnalytical Chemistry0202 electrical engineering electronic engineering information engineeringlcsh:TP1-1185Metering modeElectrical and Electronic EngineeringInstrumentationvoltage and current sensing020208 electrical & electronic engineeringpower qualityAtomic and Molecular Physics and OpticsCurrent transformerReliability engineeringTransducerEnergy meteringharmonic analysisHarmonicPower qualitySettore ING-INF/07 - Misure Elettriche E ElettronicheLow voltageVoltageSensors
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Compensation of Nonlinearity of Voltage and Current Instrument Transformers

2019

This paper aims at characterizing and improving the metrological performances of current and voltage instrument transformers (CTs and VTs) in harmonic measurements in the power system. A theoretical analysis is carried out to demonstrate that, due to the iron core nonlinearity, CT and VT output signal is distorted even when the input signal is a pure sine wave. Starting from this analysis, a new method for CT and VT characterization and compensation is proposed. In a first step, they are characterized in sinusoidal conditions and the harmonic phasors of the distorted output are measured; in the second step, these phasors are used to compensate the harmonic phasors measured in normal operati…

uncertainty.Materials sciencepower system measurementAcousticsHarmonics020208 electrical & electronic engineeringPhasorHarmonicinstrument transformers (ITs)02 engineering and technologypower qualitySignalCurrent transformerCompensation (engineering)Harmonic analysisSine waveDistortion0202 electrical engineering electronic engineering information engineeringHarmonicElectrical and Electronic EngineeringuncertaintySettore ING-INF/07 - Misure Elettriche E ElettronicheInstrumentationIEEE Transactions on Instrumentation and Measurement
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