Academic literature on the topic 'Champ électrique haute tension'
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Journal articles on the topic "Champ électrique haute tension":
-Barthod, C. "Sonde optique de champ électrique pour des installations haute tension." Revue de l'Electricité et de l'Electronique -, no. 08 (2003): 55. http://dx.doi.org/10.3845/ree.2003.099.
Didon, N., S. Agnel, J. Castellon, P. Notingher, A. Toureille, J. Matallana, H. Janah, P. Mirebeau, and R. Coelho. "Distribution du champ électrique sous haute tension continue et gradient de température dans le diélectrique des câbles extrudés." Journal of Electrostatics 64, no. 7-9 (July 2006): 456–60. http://dx.doi.org/10.1016/j.elstat.2005.10.032.
Herrera, Fernando A., Aladdin H. Hassanein, Bruce Potenza, Marek Dobke, and Niren Angle. "Lésion vasculaire bilatérale du membre supérieur par brûlure électrique à haute tension." Annales de Chirurgie Vasculaire 24, no. 6 (August 2010): 898.e13–898.e17. http://dx.doi.org/10.1016/j.acvfr.2011.01.020.
Faburel, Guillaume, and Karen Chevallier. "L’intérêt des expérimentations participatives pour les savoirs de l’environnement et des paysages. Le cas des grands projets d’équipement." Lien social et Politiques, no. 73 (June 1, 2015): 95–115. http://dx.doi.org/10.7202/1030953ar.
Delhoste, Marie-France. "Influence délétère des effets de champs électromagnétiques constatés sur un élevage. / Charte de l'environnement. Principe de précaution, déclinaison préventive de la théorie des risques. / Présomption de fait de l'existence d'un risque spécial. / Responsabilité sans faute pour risque spécial. Dommage anormal imputable à l'exercice de la servitude de surplomb de la ligne électrique à très haute tension. Tribunal de grande instance de Tulle, 28 octobre 2008, M. Marcouyoux c/ Réseau de transport d'électricité - EDF Transport, n° 07/07. Avec note." Revue Juridique de l'Environnement 34, no. 4 (2009): 447–56. http://dx.doi.org/10.3406/rjenv.2009.4915.
OUALI, A. "Conséquences des traitements technologiques sur la qualité de la viande." INRAE Productions Animales 4, no. 3 (July 31, 1991): 195–208. http://dx.doi.org/10.20870/productions-animales.1991.4.3.4334.
Cadet, Frédéric. "Lignes électriques aériennes à très haute tension - DUP. Risques liés aux champs électromagnétiques. Contrôle du respect du principe de précaution : méconnaissance (non). Utilité publique du projet (oui). Conseil d’Etat, Assemblée, 12 avril 2013, Association Coordination Interrégionale Stop THT et autres, n° 342409, avec note." Revue Juridique de l'Environnement 38, no. 4 (2013): 675–87. http://dx.doi.org/10.3406/rjenv.2013.6121.
Faucher, Albert. "Pouvoir politique et pouvoir économique dans l'évolution du Canada français." III. Les structures du pouvoir social 7, no. 1-2 (April 12, 2005): 61–79. http://dx.doi.org/10.7202/055299ar.
Benaïssa, Ibtissam. "Propriétés de la zone cathodique d’un plasma pour laser à excimère." Journal of Renewable Energies 10, no. 4 (December 31, 2007). http://dx.doi.org/10.54966/jreen.v10i4.752.
PELENC, Yves. "Appareillage électrique d'interruption à haute tension." Réseaux électriques et applications, September 1988. http://dx.doi.org/10.51257/a-v1-d4700a.
Dissertations / Theses on the topic "Champ électrique haute tension":
El-Belghiti, Kamal. "Amélioration de l'extraction aqueuse de solutés des produits végétaux par champ électrique pulsé." Compiègne, 2005. http://www.theses.fr/2005COMP1563.
The work presented in this thesis deals with the development of a process of aqueous extraction of solute from vegetable products coupled to a moderate pulsed electric field (MPEF). It aims at the improvement of yield of solute and the extraction kinetics. The effect of MPEF parameters (intensity and number of pulses), agitation during extraction, shape and size of particles, solution temperature and centrifugaI field, has been studied. The main experimental work was carried out with samples of sugar beet and carrot, in form of disk and gratings, treated by MPEF of different intensities (200-1200 V/cm) and different numbers of pulses (50-1000) of 100 ilS. Aqueous extraction was carried out at various temperatures (20-50°C), under various agitation speeds (0-750 rpm) and centrifugaI accelerations (09660xg). After the development of an experimental methodology, we observed that the MPEF increases the final yield of solute. The agitation of solution, the moderate heating and the centrifugaI field accelerate the extraction kinetics. The reduction ofparticles size increases the yield of solute and accelerates the extraction kinetics. An optimisation ofboth MPEF and extraction parameters allowed to reach a maximal yield of solute (95%) under an electrical energy consumption of 6-7 and 9 kJ/kg for sugar beets and carrots, respectively. On the other hand, the combination of the process with moderate heating and/or centrifugaI field permitted to reduce from 2 to 4 times the extraction duration. . The aqueous extraction kinetics was described by a bi-exponential model involving two simultaneous processes: rapid washing, which cannot be taken into account by Fick's law, and slow diffusion. The MPEF has shown an inefficiency with dry vegetable products (Ieaves of black tea and roots of Datura Innoxia). A treatment by electric discharges of high tension (EDHT) (40 kV) allowed the acceleration of extraction from such products
Daba, Abdel-Ghani. "Mesure de l'ionisation en fonction du champ électrique dans le tétraméthylsilane (TMS)." Grenoble 1, 1992. http://www.theses.fr/1992GRE10095.
Ndoumbe, Jean. "Etude comportementale des gouttelettes d'eau déposées sur la surface d'un isolateur composite haute tension en présence du champ électrique." Phd thesis, Ecole Centrale de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-00985438.
Delsart, Cristele. "Champs électriques pulsés et décharges électriques de haute tension pour l’extraction et la stabilisation en oenologie." Thesis, Bordeaux 2, 2012. http://www.theses.fr/2012BOR21982/document.
The wine industry needs to find solutions in the coming years to reduce its carbon footprint by 20% and quickly propose alternatives to sulphur dioxide usage. This work on pulsed electric fields offers wine professionals an eco-innovation that could help to address these two issues. Eco-innovation is increasingly seen as the key to future competitiveness in the context of sustainable development. However, before being integrated in wine production, eco-innovation must demonstrate its performance and efficiency without compromising product quality and consumers safety so that it could be approved by government authorities (OIV, EU ...). As such, this thesis has received a joint financial support from the CIVB and the ADEME. The principle of Pulsed Electric Field (PEF) is to apply to a product; electrical pulses of a few kilovolts in a very short period time (a few microseconds) and then repeated n times. During treatment (grapes, grape must or wine) cells transmembrane potential increases till the induction of pores in the membranes. The irreversibility of the pores leads not only to the extraction of cellular components but also cell death. Thus, depending on the time of this technology application in winemaking and operating parameters, allows the extraction of sensory interests compounds such as polyphenols or the inactivation of microorganisms. PEF takes into account three important aspects to the sustainability of a technology: environment, economy and quality. This technique has a number of advantages for wine producers: clean, fast, inexpensive, efficient, industrializable and automated. Compared to other treatments such as pasteurization, sterile filtration, thermovinification, hot or cold maceration, cryoextraction or flash-release, its energy consumption is low (a few tens of kWh / tonne). PEF technology is environmentally friendly, as it requires little energy and no chemical inputs. It is fast and efficient because the processing time is only a few tens to hundreds of milliseconds. Finally, this technique is a non-thermal and therefore does not degrade the heat-sensitive molecules such as flavours. The objectives of this research work was to understand the effect of PEF on the cells, to determine the processing parameters during the extraction of compounds of interest grapes and to inactivate microorganisms in order to stop alcoholic fermentation of sweet wines and stabilize microbiologically red wines before bottling maintaining the quality of the processed product
He, Qian. "Étude sur le mécanisme d'activation du bois/bambou/adhésif et amélioration du collage induit par le champ électrique à haute tension." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0147.
In this study, the advanced equipments were selected in order to investigate the effects of HVEF on the physicochemical properties of wood and bamboo, the effects of HVEF on the chemical structure and rheological properties of adhesives under a series of HVEF parameters. The aggregation effect of adhesive at bonding interface induced by HVEF has also been revealed and the micro-mechanical prediction model is established.The main conclusions of this study are as follows:1.After HVEF treatment, the surface activity of wood and bamboo increased significantly. Moreover, with the increase of voltage/time, the surface free radicals, O/C ratio and the number of oxygen groups increased significantly while the contact angle decreased. Under the condition of 60kV, the surface activity highly increased. The increment of free radicals was 26%, the decrease of initial contact angle was 22%, the decrease of equilibrium contact angle was 23%, the increment of free energy component was 43% ~ 75%, the increment of O/C ratio was 34%, the increment of oxygen-containing groups were 39% (C‒OH), 149% (C‒O or C=O) and 97% (O‒C=O), respectively. Therefore, under HVEF treatment, the physical and chemical properties of wood and bamboo can be significantly improved, which is conducive to improving the interphase properties of composite materials.2.With the increase of voltage/time, significantly improved inter-molecular reactions of urea formaldehyde resin and phenol formaldehyde resin were obtained. After 60kV/8 min treatment, significant increment of the characteristic peaks of C‒O groups were obtained. Under HVEF treatment, the temperature/frequency dependence of the rheological behaviors of the two resins changed significantly. Therefore, the degree of inter-molecular polymerization of phenol formaldehyde and urea formaldehyde resin can be significantly improved and the viscoelasticity of the resin can be improved under HVEF treatment.3.After HVEF treatment, the distribution of adhesive at the bonding interphase was continuous and uniform. The penetration depth was significantly reduced. The density and bonding strength at the bonding interphase were significantly increased, and the delamination rate was reduced. After treatment, the maximal density at interphase is 1081 kg/m3, which was 32% higher than the control. The bonding strength increased from 0.66MPa to 1.25MPa and the wood breaking rate increased to 85%, and the delamination rate decreased to 5.97%. For bamboo material, the bonding strength was significantly improved after HVEF treatment. The bonding strength of bamboo skin and bamboo skin was 9.51MPa, and the bamboo failure ratio was 60%. In the combination of bamboo pith and bamboo pith, the maximum bamboo failure ratio was 85%, which was increased by 70%. Therefore, under HVEF treatment, the continuous and uniform distribution of bonding interphase adhesives can be obtained, which can significantly improve the bonding performance of wood bamboo composite, and is conducive to the efficient utilization of wood bamboo composite.4. According to the vertical density profile at the bonding interface, the laminated stiffness and stress distribution model of the bonding interface has been established. The results showed that the relative error was less than ±15%. Based on the distribution model, the macroscopic mechanical properties of composite are predicted with the combination of composite mechanics and laminated plate theory, including elastic modulus, bending strength, shear modulus and shear strength. The results showed that the prediction error of mechanical properties is less than 30%. With the stiffness and strength distribution model, the effect of HVEF treatment can be quantitatively characterized and the mechanical properties of HVEF treated composites can be predicted. As a result, strengthening mechanism of bonding interphase can be revealed with the the stiffness and strength distribution model
Zavattoni, Laëtitia. "Conduction phenomena through gas and insulating solids in HVDC gas insulated substations, and consequences on electric field distribution." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT063/document.
The emergence of renewable energy leads to a development of new technologies for energy distribution across long distances. The latter will be based on High Voltage Direct Current (HVDC) to avoid capacitance losses. This network is interconnected using Gas Insulated Substation (GIS), which insulation is composed of pressurized gas (SF6) and solid insulators (epoxy resin), which have to withstand HVDC. The electric field is not anymore determined by permittivity of materials, but by resistivities and charge accumulation. In the case of an insulator with an interface with gas, electrons or ions will move across electric field lines and will charge the surface of the solid insulator. The behavior of insulator's properties (gas and solid) constitutes a major challenge for the development of HVDC GIS, to understand the charge relaxation/accumulation mechanisms.In this work, the characterization of solid insulator has first been investigated, based on a low-noise current measurement method. It is thus possible to measure the leakage current through samples and onto their surface, in a pressurized gas, at high electric field and for different temperatures. Those measurements permit to evidence that both volume and surface resistivities are strongly impacted by the increase of temperature and water concentration. It has also been shown that surface resistivity has a non-linear behavior with electric field. A numerical model was developed, to simulate experimental results, showing that the surface properties of the insulator can be implemented.Furthermore, the insulating properties of the gas were also investigated through different electric field geometry (coaxial and uniform), in order to estimate the contribution of current through gas on the charge accumulated on solid insulators. It has been found that a non-negligible current passes through the gas (~pA to nA). To determine the mechanisms responsible for such currents, the latter has been characterized depending on several parameters (electrode surface roughness, material nature, electric field, temperature and relative humidity). It revealed that the variations of currents are strongly impacted by the conditioning of the device and thus by the relative humidity adsorbed on electrodes and enclosure surfaces. In presence of a dry system (dry gas and device) low current were measured (~pA), which increases with temperature. On the contrary, in case of a “wet” system (humid gas and device) the current decreases with increasing temperature. Those results combined with the influence of the electrode roughness, strongly suggest a mechanism of charge injection at the electrode surface, enhanced by water adsorption.Finally, the results obtained for both solid and gaseous insulations are used to develop a numerical model with a shape close to the industrial application, and observe the modification of electric field distribution in presence of water concentration and temperature gradient. An estimation of current flowing through the insulator and gas is thus possible in case of uniform and gradient temperature.In conclusion, this work gives the variations of both volume and surface resistivities in an epoxy resin with temperature and electric field. It also evidences the major influence of relative humidity and temperature on charge injection mechanisms which contribute to the current measured through gas. The extensive characterization performed, enables to develop a simulation which predicts the variations of electric field distribution within an HVDC GIS
Vu, Thi Thu Nga. "Étude des phénomènes de charges d'espace dans des matériaux de câbles et câbles modèles destinés à des applications au transport d'énergie en Haute Tension Continue (HVDC)." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2389/.
This work contributes to the development of polymer-insulated high voltage direct current (HVDC) cables, focusing on the investigation of space charge build-up phenomena and their consequences on electric field distribution within cables and cable joints under thermal gradient. In this study, conduction current measurements were realized on two different materials often used for HVDC cable construction, being cross-linked polyethylene (XLPE) used as cable insulation and an elastomer (EPDM) used in accessories. These data were used to build semi-empirical models of conductivity versus temperature and electric field. These models were incorporated in a commercial simulation tool in order to predict charge density and field distributions in more complex geometries such as cylindrical geometry and insulations association, submitted to various thermal and electrical stresses, in non-stationary conditions. Space charge measurements were carried out on bi-layers of XLPE/EPDM, and on medium voltage (MV) model cables and mini-cables, using the pulsed electro acoustic method. Results obtained on bi-layers as models of joints under various conditions of temperature and field show that the sign of the interfacial charges in the bi-layers depends on temperature and electric field. This makes non-homogeneous field distribution in bi-layers. For cables under thermal gradient, results show a switching in time of the position of field maximum from the inner semi-conductor to the outer semi-conductor due to the electrical conductivity gradient resulting from the thermal gradient along cable radius. Simulation results obtained on bi-layers (sign and density of charges) and within MV cables are consistent with charge density profiles obtained experimentally under various electrical and thermal stresses. Deviations between simulation and measurements are attributed to charge accumulation processes not accounted for in the model, involving notably cross-linking by-products. The effect of cross-linking by-products on the response of insulations is investigated through measurements on mini-cables and through the evaluation of parameters relevant to the accumulation of charges applied to various formulations of samples in plaque form. Substantial distortions of the electric field profile were measured, testifying for the evident propensity of by-products to dissociate under the electric field and/or assist charge injection
Niu, Shiqin. "Conception, optimisation et caractérisation d’un transistor à effet de champ haute tension en Carbure de Silicium." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI136/document.
Silicon carbide (SiC) has higher critical electric field for breakdown and lower intrinsic carrier concentration than silicon, which are very attractive for high power and high temperature power electric applications. In this thesis, a new 3.3kV/20A SiC-4H JFET is designed and fabricated for motor drive (330kW). This breakdown voltage is beyond the state of art of the commercial unipolar SiC devices. The first characterization shows that the breakdown voltage is lower (2.5kV) than its theoretical value. Also the on-state resistance is more important than expected. By means of finite element simulation the origins of the failure are identified and then verified by optical analysis. Hence, a new layout is designed followed by a new generation of SiC-4H JFET is fabricated. Test results show the 3.3kV JFET is developed successfully. Meanwhile, the electro-thermal mechanism in the SiC JFETs under short circuit is studied by means of TCAD simulation. The commercial 1200V SIT (USCi) and LV-JFET (Infineon) are used as sample. A hotspot inside the structures is observed. And the impact the bulk thickness and the canal doping on the short circuit capability of the devices are shown. The physical models validated by this study will be used on our 3.3kV once it is packaged
Demers, Pierre. "Simulation numerique des vibrations induites par effet de couronne sur les conducteurs a haute tension." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1994. http://theses.uqac.ca.
Jaffre, Yoann-Nicolas, and Yoann-Nicolas Jaffre. "Optimisation de réacteurs à plasmas non-thermiques pour le traitement des oxydes d'azote." Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00567199.
Books on the topic "Champ électrique haute tension":
Kuffel, E., P. Hammond, and W. S. Zaengl. High Voltage Engineering: Fundamentals. Elsevier Science & Technology Books, 2013.
Book chapters on the topic "Champ électrique haute tension":
MEDZOGO, Sylvain, and Laurent GAJO. "Tensions entre norme pédagogique et normes endogènes du français." In L’expansion de la norme endogène du français en francophonie, 225–46. Editions des archives contemporaines, 2023. http://dx.doi.org/10.17184/eac.7572.