Search results for "elettrici"

showing 10 items of 959 documents

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
researchProduct

The strategies for the diffusion of EVs: Focus on Norway and Italy

2017

The goal of this work is to predict e-mobility trends which are essential for understanding the market and the infrastructure development over the next years. Nowadays among the many and different standards and rules there are two charging categories for electric vehicles: High power DC and AC charging modes. It will be interesting to see which technology will prevail in the next few years and if the charging mode option on a given EV affects its sales performance. This study presents the current e-mobility scenario in Norway and Italy, in particular analyzing: EV technical and commercial features, electric vehicle market related national incentive policies, technical and diffusion connecto…

Engineeringbusiness.product_categoryElectric vehicles020209 energy02 engineering and technologyElectric vehicleSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciinfrastructureCharging stationElectric vehicle0202 electrical engineering electronic engineering information engineeringRenewable EnergyElectrical and Electronic EngineeringIndustrial organizationFocus (computing)Sustainability and the EnvironmentRenewable Energy Sustainability and the Environmentbusiness.industryMode (statistics)Electrical engineeringRenewable energySettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaIncentiveWork (electrical)charging station; e-mobility; Electric vehicles; infrastructure; Renewable Energy Sustainability and the Environment; Automotive Engineering; Electrical and Electronic EngineeringAutomotive EngineeringNiche markete-mobilitycharging stationbusiness
researchProduct

Diagnosis of mechanical unbalance for double cage induction motor load in time-varying conditions based on motor vibration signature analysis

2013

This paper investigates the detectability of mechanical unbalance in double cage induction motor load using motor vibration signature analysis technique. Rotor imbalances induce specific harmonic components in electrical, electromagnetical, and mechanical quantities. Harmonic components characteristic of this category of rotor faults, issued from vibration signals analysis, are closely related to rotating speed of the rotor, which complicates its detection under non-stationary operating conditions of the motor. Firstly, experimental results were performed first under healthy and mechanical load unbalance cases, for different load levels under steady-state operating conditions to evaluate th…

Engineeringcondition monitoringSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettricilaw.inventionelectromagnetical quantitieWaveletRotorlawInduction motorelectrical quantitieMechanical loadrotating speedRotor (electric)Condition monitoringharmonic componentTime-frequency analysicurrent signature analysiTransient analysiSteady-statewavelet transformsmotor radial vibration signature analysis techniquemechnical load unbalanceHarmonicwavelet analysimotor axial vibration signature analysis techniquemotor vibration signature analysiApproximation methodtime-varying conditionVibrationvibration measurementmechanical quantitienonstationary operating conditionControl theorymechanical unbalanceSensitivity (control systems)vibration signals analysirotor imbalancewavelet transformvibration signature analysiRenewable Energy Sustainability and the Environmentrotor faultbusiness.industryfault diagnosiFFT analysifast Fourier transformVibrationdouble cage induction motor loadignal processingbusinessInduction motor2013 International Conference on Renewable Energy Research and Applications (ICRERA)
researchProduct

Impact of integrating photovoltaic based DG on distribution network harmonics

2017

The process of integrating various distributed generation (DG) technologies in power system networks is increasing rapidly in the recent years. One major concern about the integration of DGs is their impact on network harmonics. The aim of this paper is to investigate the effects caused by the integration of photovoltaic DG in distribution networks on system harmonics. The penetration level, number of DG units, and their location are used as parameters in order to verify the effects of DG on system harmonics. Moreover, a study of single and double tuned filters is conducted as harmonics mitigation techniques. Detailed simulations using Matlab/Simulink are inserted in order to explain and ve…

Engineeringdistributed generationDistribution networksbusiness.industry020209 energyPhotovoltaic systemElectrical engineeringProcess (computing)02 engineering and technologyphotovoltaicSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectric power systemDG integrationHarmonicsDistributed generation0202 electrical engineering electronic engineering information engineeringElectronic engineeringtotal harmonic distortionbusinessMATLABcomputercomputer.programming_language
researchProduct

Control of solid-state fault current limiter for DG-integrated distribution systems

2017

Fault current limier (FCL) is a device that limits the system current under fault conditions without disconnecting the system and affecting the power system protection components such as circuit breakers. Many types of FCLs have been proposed to limit the magnitude of the fault current. Solid-state fault current limiters (SSFCLs) can limit the peak value of the fault current by applying several methods, such as controlling the system impedance or controlling the voltage that appears across the fault. In this paper, a new control scheme for the SSFCL circuit is presented. The control method is based on controlling the duty cycle of solid state switches to control the rms value of the system …

Engineeringdistributed generationbusiness.industrySolid-state relay020208 electrical & electronic engineeringHardware_PERFORMANCEANDRELIABILITY02 engineering and technologyFault (power engineering)01 natural sciencesFault indicatorSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaControl theoryDuty cycleduty cycle0103 physical sciencesFault current limiter0202 electrical engineering electronic engineering information engineeringElectronic engineering010306 general physicsbusinessPower-system protectionsolid state fault current limiterElectrical impedanceCircuit breakerFault current limiter2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
researchProduct

Wind Turbine Mechanical Characteristics and Grid Parameters Influence on the Transient Voltage Stability of a Fixed Speed Wind Turbine

2008

This paper describes the effect of wind turbine mechanical characteristic of construction and grid parameters on the transient voltage stability of a fixed speed wind turbine (FSWT) connected to a simple grid. The model of FSWT has been developed in Matlab/Simulink. Using this model, a three-phase fault is applied close to the wind turbine (WT) and cleared by disconnecting the faulted line. The effects of mechanical construction of WT and of grid parameters on the voltage stability of this simple case are evaluated and discussed. The considered parameters are the inertia coefficient of the WT, the short-circuit power at the connection bus, the hub-generator resonant frequency, the wind spee…

Engineeringdynamic model pitch control system voltage stability investigation wind turbine.Wind powerbusiness.industryInduction generatorAC powerFault (power engineering)TurbineTransient voltage suppressorWind speedSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaControl theoryTransient (oscillation)business
researchProduct

Effects of Electrical Parameters of Induction Generator on the Transient Voltage Stability of a Fixed Speed Wind Turbine

2008

This paper describes the effect of electrical parameters of the induction generator on the transient voltage stability of a fixed speed wind turbine connected to a simple grid; the dynamic behavior of a wind turbine connected to the grid is examined. The model of the fixed speed wind turbine has been developed in the simulation tool Matlab/Simulink. Itpsilas composed by the induction generator, the shaft system, the aerodynamic model of the wind turbine rotor and the pitch control system. Using this model, a three-phases fault is applied close to the wind turbine and cleared by disconnecting the faulted line. The effect of different electrical parameters of the induction generator on the vo…

Engineeringdynamic model pitch control system voltage stability investigation wind turbine.Wind powerbusiness.industryStatorInduction generatorAerodynamicsTransient voltage suppressorTurbinelaw.inventionInductanceSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaPitch controlControl theorylawbusiness
researchProduct

Current and Voltage Behaviour During a Fault in a HV/MV System: Methods and Measurements

2015

When a single line to ground fault happens on the MV side of a HV/MV system, only a small portion of the fault current is injected into the ground by the ground-grid of the faulty substation. In fact the fault current is distributed between grounding electrodes and MV cables sheaths. In systems with isolated neutral or with resonant earthing this may be sufficient to provide safety from electric shock. Experimental measurements were performed on a real MV distribution network: a real single line to ground fault was made and fault currents were measured in the faulty substation and in four neighbouring substations. In this paper the problem of fault current distribution is introduced, the te…

Engineeringelectrical and electronic engineeringGlobal earthing systemCurrent distribution; Electrical safety; Global earthing systems; grounding; Power distribution faults; Single line to ground faultHardware_PERFORMANCEANDRELIABILITYFault (power engineering)Fault current limiterElectronic engineeringmedicineGlobal earthing systemscurrent distribution; electrical safety; global earthing systems; grounding; power distribution faults; single line to ground fault; electrical and electronic engineering; energy engineering and power technologyenergy engineering and power technologyCurrent distributionPower distribution faultsElectrical safetySingle line to ground faultElectric shockGroundbusiness.industryElectrical engineeringgroundingSingle linemedicine.diseaseEarthing systemSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaCurrent (fluid)businessPower distribution faultVoltage
researchProduct

Influence of LV neutral grounding on global earthing systems

2015

International Standards define a Global Earthing System as an earthing net created interconnecting local Earthing Systems (generally through the shield of MV cables and/or bare buried conductors). In Italy, the regulatory authority for electricity and gas requires distributors to guarantee the electrical continuity of LV neutral conductor. This requirement has led to the standard practice of realizing “reinforcement groundings” along the LV neutral conductor path and at users’ delivery cabinet. Moreover, in urban high-load scenarios (prime candidates to be part of a Global Earthing System), it is common that LV distribution scheme creates, through neutral conductors, an effective connection…

Engineeringelectrical and electronic engineeringmaxwell subareas method020209 energyEnergy Engineering and Power TechnologyGround and neutralindustrial and manufacturing engineering02 engineering and technologyRegulatory authorityGlobal earthing system (GES) global grounding system (GGS) ground potential LV neutral conductor maxwell subareas method.control and systems engineeringlv neutral conductorShield0202 electrical engineering electronic engineering information engineeringglobal earthing systemmaxwell sub-areas methodGlobal earthing system (GES)Electrical conductorglobal grounding system (GGS)Groundbusiness.industryGES; GGS; global earthing system; global grounding system; ground potential; lv neutral conductor; maxwell sub-areas method; control and systems engineering; industrial and manufacturing engineering; electrical and electronic engineeringElectrical engineeringGlobal Earting SystemGESglobal grounding systemground potentialEarthing systemGGSGlobal earthing system (GES); global grounding system (GGS); ground potential; LV neutral conductor; maxwell subareas method; Control and Systems Engineering; Industrial and Manufacturing Engineering; Electrical and Electronic EngineeringSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaGlobal Earting System; GES; Global Grounding System; GGS; Ground potential; Maxwell Sub-areas Method; LV neutral conductorHigh loadElectricityGES; GGS; Global earting system; global grounding system; ground potential; lv neutral conductor; maxwell sub-areas method; electrical and electronic engineering; energy engineering and power technologybusiness
researchProduct

Urban Energy Hubs and Microgrids: Smart Energy Planning for Cities

2017

In this chapter, we try to connect the urban design features with energy consumption and consequent pollution parameters. After a review of a selected set of approaches to Urban Energy Systems study with a special focus on electrical power systems, urban energy systems are proposed as networks of multi-source hybrid energy hubs, where different energy flows are collected at the same bus and can be stored, delivered or transformed as needed. Resources at the hub and infrastructures interact with each other; therefore, both definition and boundaries of such energy systems at urban level are difficult to be clearly outlined. Similarly, the possibility to generate new operational models based o…

Engineeringenergy hubs micvrogrids energy planning smart citiesbusiness.industry020209 energyMechanical engineering02 engineering and technologyEnergy planning021001 nanoscience & nanotechnologySettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaElectric power system0202 electrical engineering electronic engineering information engineeringSystems engineering0210 nano-technologybusinessEnergy (signal processing)
researchProduct