Search results for "power transformer"

showing 8 items of 8 documents

Experimental Evaluation on Narrow Band Power Line Communication in Medium and Low Voltage Smart Grids

2013

The aim of this work is to perform a feasibility study on the power line communication for the development of a new generation of interface devices (IDs) for smart grid and energy storage applications. More in detail, this paper deals with one of the most important issues on this topic, which is the communication system. Among the existing communication technologies, the study is focused on power line communications (PLCs). After an analysis of the state of the art in the field, the main aspects are analyzed, concerning the open issues on the use of PLCs, especially for medium voltage (MV) and low voltage (LV) systems. In this work the use of PLC in MV-LV networks is investigated, by means …

communication systems power system communication power transformers communication equipment testing narrow band power line communication attenuation smart gridsSettore ING-INF/07 - Misure Elettriche E Elettroniche
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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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Medium Voltage Smart Grid: Experimental Analysis of Secondary Substation Narrow Band Power Line Communication

2013

This paper is focused on the possibility of employing narrow band power line communication (PLC) in medium voltage (MV) distribution networks. The topic is investigated by means of both simulations and experimental tests, which were carried out in the distribution network of Ustica Island. In detail, a two-way MV communication was tested between two secondary substations connected by an MV cable power line. Each substation has a by-pass connection at MV bus-bars and an MV/LV oil filled power transformer. In this paper, the MV and the PLC systems under test are described and the experimental tests are presented, which were carried out to evaluate the parameters of the simulation model. The a…

EngineeringSwitched-mode power supplyPower system communicationPower line communicationsSmart gridPower transformersPower factorEquipment testingCommunication systemsSmart power gridsElectronic engineeringElectrical and Electronic EngineeringInstrumentationElectric power distributionbusiness.industryCommunicationElectrical engineeringAttenuationComputer simulationPower (physics)Power-line communicationElectric power transmissionPower system measurementCommunication equipment testingPower engineeringbusinessAttenuation communication equipment testing communication systems narrow band power line communication power system communication power system measurements smart gridsSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltageIEEE Transactions on Instrumentation and Measurement
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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
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Experimental investigation on PLC signal crossing of power transformers

2014

In this work the use of PLC in MV-LV networks is investigated, by means of experimental tests in the case of a two-ways MV/LV communication between two secondary substations. The two substations are connected by a MV overhead power line. Moreover each substation has a by-pass connection at MV bus-bars and a MV/LV power transformer. A ST7580 transceiver is used to inject the communication signal. The transceiver is embedded in a new interface device developed by the authors. In the paper the communication issues are introduced and some experimental tests are presented and discussed. Such tests have been carried out in the presence of voltage net, i.e. 24 kV, with the aim to verify the possib…

EngineeringElectric power distributionbusiness.industrycommunication systems power system communication power transformers communication equipment testing narrow band power line communication attenuation smart gridsOverhead power lineElectrical engineeringcommunication systemsnarrow band power line communicationSignalCurrent transformerpower transformerspower system communicationElectric power transmissionsmart gridsElectronic engineeringPower engineeringTransceiverbusinessSettore ING-INF/07 - Misure Elettriche E Elettronicheattenuationcommunication equipment testingVoltage
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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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A back to back method for the temperature rise test of prefabricated substations: A case study

2015

In this work a back to back method is presented which allows to develop heating tests of prefabricated secondary substations with a limited number of supplying equipment (an induction regulator and a capacitor bank). The proposed method makes use of the transformer tap changers to create a voltage difference on the medium voltage side. In this way, only an adjunctive low voltage supply is needed. With the proposed test system, the heating tests are developed on a 1000 kVA prefabricated substation. Thanks to the experimental tests, the class of enclosure of the substation and the operating temperature and resistance of the power transformers are determined, according to the recommendations o…

Engineeringbusiness.industryprefabricated substationRenewable Energy Sustainability and the EnvironmentElectrical engineeringpower transformerEnergy Engineering and Power TechnologyPower factorInduction regulatorSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciDistribution transformerTap changerAutomotive engineeringlaw.inventionlawEnergy efficient transformertemperature riseVoltage regulationheating testDelta-wye transformerbusinessTransformerSettore ING-INF/07 - Misure Elettriche E Elettroniche
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Oil filled MV/LV Power Transformer Behavior in Narrow Band Power Line Communication Systems

2012

The aim of this paper is to characterize oil-filled power transformers in the narrow-band power-line communication (PLC) frequency range of 50-150 kHz. A new model is proposed for such type of a transformer, in the aforementioned frequency range of interest, in order to study its influence on the signal transmission and to investigate the possibility that the PLC signal can cross the power transformer itself. The new model is simpler than those previously proposed in literature, and it can be used in the whole frequency range available for NB PLC according to the CENELEC EN 50065-1 A-band. In order to validate the model, simulation and measurement results are compared for four oil-filled po…

EngineeringFrequency-shift keyingbusiness.industryOverhead power lineElectrical engineeringAttenuation communication equipment testing communication systems narrow-band power-line communication (NB-PLC) power system communication power transformersCommunications systemlaw.inventionpower transformerspower system communicationnarrow-band power-line communicationPower-line communicationPower ratinglawElectromagnetic coilElectronic engineeringElectrical and Electronic EngineeringbusinessTransformerInstrumentationLow voltageSettore ING-INF/07 - Misure Elettriche E Elettronichecommunication equipment testing
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