Search results for "OLT"

showing 10 items of 5524 documents

Partial Discharges in HVDC Cables - The Effect of the Temperature Gradient During Load Transients

2021

The paper investigates the role of the space charge accumulation phenomena in the inception of Partial Discharges (PD) in a defect within the bulk of the dielectrics of a High Voltage Direct Current (HVDC) cable. It is widespread accepted that the number of PD occurring in an HVDC cable during its lifetime is largely less than that under AC voltage stress. This is essentially due to higher values of the voltage between the conductor and the screen needed to trigger PD under a steady DC voltage than the same value under AC stress. Nevertheless, due to the dependency of the electrical conductivity of the insulation on the electric field and temperature, PD in HVDC cables is strongly influence…

power cable insulationHVDCMaterials sciencepartial discharge (PD)Electric field simulationDirect currentfinite element analysisMechanicsSpace chargeStress (mechanics)Settore ING-IND/31 - ElettrotecnicaTemperature gradientElectrical resistivity and conductivityload transientsTransient (oscillation)Electrical and Electronic EngineeringCurrent (fluid)VoltageIEEE Transactions on Dielectrics and Electrical Insulation
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A Power Law Behavior in the Incentivized Italian Photovoltaic Market

2018

The Italian photovoltaic (PV) marketis analyzed by using the data contained in the database that describes all PV Plants installed in Italy under the incentive program called “2nd Conto Energia”. It is shown that the cumulative probability distribution of the size of the installed PV plants has a broken power tail. An approach to partially quantify the effect of the economic, juridical and technical rules is introduced in order to show how the regulatory body influences the power tail of the cumulative probability curve.

power lawEnvironmental EngineeringSettore ING-IND/11 - Fisica Tecnica AmbientaleRenewable Energy Sustainability and the Environment020209 energyCumulative distribution functionPhotovoltaic systemAuthorizationEnergy Engineering and Power Technology02 engineering and technologyPower lawIndustrial and Manufacturing EngineeringPower (physics)Order (exchange)Hardware and Architecture0202 electrical engineering electronic engineering information engineeringEconometricsEconomicsphotovoltaic marketProbability distributionIncentive programElectrical and Electronic Engineeringenergy
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“Coupling interfaces for communication transceivers over power lines”

2010

power line communication medium voltage cables fsk transreceivers
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Coupling circuit for power line communications

2013

A coupling interface couples a transceiver to one or more capacitive voltage dividers of a power transmission system. The coupling interface includes a first signal path including an adjustable inductance configured to form a resonance circuit with a capacitance associated with the one or more capacitive voltage dividers. The coupling interface may include a second signal path including an adjustable inductance configured to form a resonance circuit with the capacitance associated with the one or more capacitive voltage dividers.

power line communication medium voltage smart gridSettore ING-INF/07 - Misure Elettriche E Elettroniche
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Model of line to shield power line communication system on a Medium Voltage network

2010

In this paper a complete model of a power line communication (PLC) system on a Medium Voltage (MV) network is presented in the case of a line-ground configuration. A simple and friendly Simulink (R) software is used to develop the model. A distributed parameter MV cable model in line-ground configuration is considered together with the power transformers, the signal coupling networks and the receiving and transmitting line coupling interface of a ST7540 FSK powerline transceiver. 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 communicationEngineeringFrequency-shift keyingbusiness.industryElectrical engineeringattenuation constantCommunications systemSignalPower-line communicationPower system simulationmedium voltageElectronic engineeringLine (text file)Transceiverbusinessmedium voltage power line communication attenuation constantComputer Science::Information TheoryVoltage2010 IEEE Instrumentation & Measurement Technology Conference Proceedings
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Power Line Communication in Medium Voltage Systems: Characterization of MV Cables

2008

The aim of this paper is to illustrate the development of a theoretical and experimental study on the characterization of medium voltage (MV) cables in the frequency range 25-200 kHz. Two transmission line configurations, line-ground and line-line, were considered in order to evaluate the main parameters, such as the characteristic impedance and the attenuation constant alpha. A simplified model of the line-ground configuration is proposed which allows one to evaluate the characteristic impedance and the attenuation constant by means of geometrical dimensions. The model was verified by experimental measurements on commonly used MV cables, RG7H1R, with an aluminium core of different sections…

power line communicationEngineeringbusiness.industryAttenuationAcousticsmedium voltage cablesEnergy Engineering and Power TechnologyAttenuation constantCharacteristic impedancelaw.inventionpower system communicationElectric power transmissionlawTransmission lineAttenuation coefficientElectrical networkElectronic engineeringcharacteristic impedanceAttenuation constant characteristic impedance medium voltage cables power line communication power system communication.Electrical and Electronic EngineeringbusinessElectrical impedanceVoltage
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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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An interface protection system with power line communication for distributed generators remote control

2014

The aim of this work is to present a narrow band power line communication (NB-PLC) interface protection system (IPS) for distributed generators (DGs); it has been developed according to the current standard CEI 0-21 and the requirements for smart grid applications. For such applications, the new IPSs have to implement new intelligent functions such as remote monitoring and control of DGs and Energy Storage Systems (ESSs) inverters, not only in terms of disconnection but also of voltage regulation and power modulation by the utility control. The main feature of the developed IPS is the ability to interact with both the grid and the DG's and ESS's inverters. In fact, it can communicate with t…

power line communicationEngineeringdistributed generationbusiness.industryinterface protection systemsRemote monitoring and controlpower system communicationsPower-line communicationSmart gridDistributed generationsmart gridsdistributed generation interface protection systems smart grids power system communications power line communication islanding detectionGrid-connected photovoltaic power systemElectronic engineeringislanding detectionVoltage regulationbusinessSettore ING-INF/07 - Misure Elettriche E ElettronicheModbusPower control2014 IEEE International Workshop on Applied Measurements for Power Systems Proceedings (AMPS)
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Precison Farming: l’Agricoltura 4.0

2016

Relazione presentata a Bologna il 9 novembre, presso il palazzo dei Congressi dell’Ente Fiere di Bologna, in occasione della 42esima manifestazione dell’EIMA, il Corso per Giornalisti dell’UNAGA dal titolo: ” Ruolo e responsabilità del giornalista nel promuovere la lotta allo spreco attraverso l’utilizzo delle nuove tecnologie”

precision farming agricoltura di precisioneSettore AGR/09 - Meccanica Agraria
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Prospettive e potenzialità della digitalizzazione del settore forestale in Italia

2022

Information and Communication Technologies (ICT) play a key role for improving the implementation of sustainable forest management at local, regional, and global level. The ICT potential to easily exploit a wider and more up-to-date set of information on the economic, environmental, and so- cial value of forests is of relevant help for the daily work of technicians, land owners, and companies in boosting the efficiency and effectiveness of forest management. The concept of “Precision Forestry” (PF) was developed from the early 2000s, as a branch of precision farming or precision agriculture. PF includes the use of ICT, remote and proximal sensing technologies, and other devices to coordinat…

precision forestry: guidelineSettore AGR/05 - Assestamento Forestale E SelvicolturaICTinnovationSettore AGR/06 - Tecnologia Del Legno E Utilizzazioni Forestali
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