Search results for "Volt"
showing 10 items of 2187 documents
Tettoia ecologica inclinata verso il sole
2010
La tettoia fotovoltaica progettata consiste in un elegante struttura pensata a servizio di spazi aperti privati o pubblici, per fornire riparo ed ombreggiamento ed al contempo produrre energia elettrica (potenza di circa 3 kWp). E' composta da due file di cinque sostegni in legno lamellare (su una lunghezza di m 5 circa), travi in profilati di acciaio zincato e copertura con pannelli fotovoltaici ancorati alle traverse metalliche. L’innovazione architettonica che si introduce con questo progetto consiste nel sovvertire il tradizionale concetto di piedritto inteso come elemento verticale di sostegno perpendicolare al piano di calpestio. Infatti, considerata l’inclinazione che necessariamente…
Caso studio: Provincia di Palermo - Installazione di impianti fotovoltaici a ridotto impatto visivo ed elevata efficienza
2014
"L'energia è il filo d'oro che collega crescita economica, salute ambientale equità e opportunità sociali". L'assessorato Regionale dell'Energia e dei Servizi di Pubblica Utilità, unitamente a tutto il Governo Regionale, ha ben chiaro il senso di queste parole del Segretario Generale delle Nazioni Unite Ban Ki- Moon, pronunciate nel corso del suo intervento al 22°Congresso Mondiale dell'Energia di Daegu in Corea del Sud.L'impegno di Tutti è quello di creare le condizioni affinchè la Sicilia possa sfruttare al massimo le proprie potenzialità e le proprie risorse, per la realizzazione di un sistema energetico equo e sostenibile, che guardi con sempre più attenzione alle realtà locali come par…
Sistema di abilitazione selettiva e disabilitazione di sicurezza per moduli fotovoltaici
2008
Governametalidade e revolta
2014
(S)legati (d)al lavoro. Adulti giovani e occupazione tra ricomposizione e frammentazione sociale
2005
Improved resolution power of electrophoretic fractionation of DNA using a voltage gradient up and down application
2004
The improved resolution power of electrophoretic fractionation of DNA in a wide range of molecular masses is demonstrated using an "up and down" application of voltage gradient gel electrophoresis (VGGE). This application also allows separation of different DNA fragments which are poorly fractionated in conventional electrophoresis.
Thermally Tunable Surface Acoustic Wave Cavities
2020
We experimentally demonstrate the dynamical tuning of the acoustic field in a surface acoustic wave (SAW) cavity defined by a periodic arrangement of metal stripes on LiNbO3 substrate. Applying a dc voltage to the ends of the metal grid results in a temperature rise due to resistive heating that changes the frequency response of the device up to 0.3%, which can be used to control the acoustic transmission through the structure. The timescale of the switching is demonstrated to be of about 200 ms. In addition, we have also performed finite-element simulations of the transmission spectrum of a model system, which exhibits a temperature dependence consistent with the experimental data. The adv…
Partial Discharge Detection Using a Spherical Electromagnetic Sensor
2019
The presence of a partial discharge phenomenon in an electrical apparatus is a warning signal that could determine the failure of the insulation system, terminating the service of the apparatus and/or the network. In this paper, an innovative partial discharge (PD) measurement instrument based on an antenna sensor is presented and analyzed. Being non-intrusive is one of the most relevant features of the sensor. The frequency response of the antenna sensor and the features to recognize different PD sources and automatically synchronize them with the supply voltage are described and discussed in details. The results show the performance of the instrument can make a fast and correct diagnosis …
Supplementary frequency regulation in non-synchronous AC system connected via MTDC
2019
Abstract In smart grid power system operation, frequency regulation is one of the most critical tasks towards power balance in the grid. This paper presents the schemes for improvement in operation of secondary loop of turbine-generator unit for frequency regulation in non-synchronous AC areas connected via multi-terminal direct current (MTDC) network. Two schemes have been discussed; (i) voltage droop based lead/lag compensator and (ii) DC power modulation at converter terminal depending upon frequency deviation from each AC area. In the first scheme, droop design based on lead/lag compensator using DC voltage deviation is introduced as supplementary signal at turbine-generator unit in eac…
Rogowski coil current transducer compensation method for harmonic active power error
2015
Abstract In the harmonic active power measurement, the highest uncertainties are generally introduced by the current and voltage transducers. In a previous paper, the authors showed that the current transformer (CT) can introduce significant errors in such measurement, especially if the phase shift between voltage and current is close to ±90°. In such condition the errors on harmonic power measurement are mainly due to the CT phase displacement. This paper shows that better results can be achieved with more linear transducers, such as the Rogowski coil current transducers (RCCTs), whose metrological performance in distorted condition can be improved, by means of a proper compensation method…