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Book Description
NOTRE OBJECTIF EST DE DIMENSIONNER LES DISPOSITIFS DE PROTECTION DES LIAISONS SOUTERRAINES PAR CABLES ISOLES, LORSQUE CES LIAISONS SONT INSEREES DANS DES LIGNES AERIENNES. LA DEMARCHE CHOISIE CONSISTE TOUT D'ABORD A DEVELOPPER UN MODELE DE CALCUL EN REGIME TRANSITOIRE DES LIAISONS SOUTERRAINES A PARTIR D'UNE MODELISATION DES CABLES PREALABLEMENT EFFECTUEE. NOUS CONFRONTONS ENSUITE LES RESULTATS OBTENUS A CEUX FOURNIS PAR UN MODELE EXISTANT ET NOUS VALIDONS NOTRE MODELE DE CALCUL PAR DES MESURES SUR UNE LIAISON REELLE. ENFIN L'ON S'INTERESSE AUX LIAISONS SOUTERRAINES AVEC MISE A LA TERRE EN UN POINT OU PERMUTATION DES ECRANS QUI NECESSITENT L'EMPLOI DE DISPOSITIFS DE PROTECTION DE LA GAINE (RESISTANCES NON LINEAIRES). ON ETUDIE LE CAS LE PLUS CONTRAIGNANT (CHOC DE FOUDRE SUR LA LIGNE AERIENNE). ON ABOUTIT A DES RECOMMANDATIONS SUR LES TENSIONS AUXQUELLES DOIVENT RESISTER LES MATERIELS, LES COURANTS QUI LES TRAVERSENT ET LES ENERGIES QU'ILS DOIVENT DISSIPER
Book Description
NOTRE OBJECTIF EST DE DIMENSIONNER LES DISPOSITIFS DE PROTECTION DES LIAISONS SOUTERRAINES PAR CABLES ISOLES, LORSQUE CES LIAISONS SONT INSEREES DANS DES LIGNES AERIENNES. LA DEMARCHE CHOISIE CONSISTE TOUT D'ABORD A DEVELOPPER UN MODELE DE CALCUL EN REGIME TRANSITOIRE DES LIAISONS SOUTERRAINES A PARTIR D'UNE MODELISATION DES CABLES PREALABLEMENT EFFECTUEE. NOUS CONFRONTONS ENSUITE LES RESULTATS OBTENUS A CEUX FOURNIS PAR UN MODELE EXISTANT ET NOUS VALIDONS NOTRE MODELE DE CALCUL PAR DES MESURES SUR UNE LIAISON REELLE. ENFIN L'ON S'INTERESSE AUX LIAISONS SOUTERRAINES AVEC MISE A LA TERRE EN UN POINT OU PERMUTATION DES ECRANS QUI NECESSITENT L'EMPLOI DE DISPOSITIFS DE PROTECTION DE LA GAINE (RESISTANCES NON LINEAIRES). ON ETUDIE LE CAS LE PLUS CONTRAIGNANT (CHOC DE FOUDRE SUR LA LIGNE AERIENNE). ON ABOUTIT A DES RECOMMANDATIONS SUR LES TENSIONS AUXQUELLES DOIVENT RESISTER LES MATERIELS, LES COURANTS QUI LES TRAVERSENT ET LES ENERGIES QU'ILS DOIVENT DISSIPER
Book Description
LE TRANSPORT ELECTRIQUE A HAUTE TENSION ET TRES HAUTE TENSION AURA DE PLUS EN PLUS RECOURS AUX CABLES SOUTERRAINS. L'INSERTION D'UNE LIAISON SOUTERRAINE DANS LE RESEAU POSE DES PROBLEMES D'ORDRE A LA FOIS ELECTRIQUE, THERMIQUE ET ECONOMIQUE. ? UNE DEFINITION DE LA LONGUEUR CRITIQUE DE TRANSPORT EST INTRODUITE, INTEGRANT LES DIFFERENTES CONTRAINTES EN TENSION ET EN COURANT ; ON PRESENTE LA COMPENSATION PAR INDUCTANCE QUI PERMET L'AUGMENTATION DES LONGUEURS DE LIAISON REALISABLES ET UNE AMELIORATION DE LA QUALITE DU TRANSPORT ; ? LES METHODES DE CALCUL DE LA CAPACITE DE TRANSPORT DES CABLES (L'INTENSITE MAXIMALE DU COURANT ADMISSIBLE SANS DEGRADATION) SONT ANALYSEES POUR LES DIFFERENTS MODES DE POSE ; ? UNE METHODE D'OPTIMISATION DES LIAISONS MIXTES AERO-SOUTERRAINES EST PROPOSEE. ELLE EST BASEE SUR L'ANALYSE DE L'ADEQUATION DES CAPACITES DE TRANSPORT DES LIGNES AERIENNES ET DES CABLES SOUTERRAINS EN REGIME NORMAL ET EN REGIME PERTURBE ; ? ON DISCUTE LES DIFFERENTS FACTEURS (INVESTISSEMENTS, PERTES) ENTRANT EN JEU DANS LE BILAN ECONOMIQUE. CETTE ETUDE EST CONCRETISEE PAR UN LOGICIEL QUI A POUR BUT DE FACILITER L'OPTIMISATION TECHNICO-ECONOMIQUE DES LIAISONS SOUTERRAINES
Book Description
Le transport électrique à haute tension et très haute tension aura de glus en plus recours aux câbles souterrains. L'insertion d'une liaison souterraine dans le réseau pose des problèmes d'ordre à la fois électrique, thermique et économique. . Une définition de la longueur critique de transport est introduite, intégrant les différentes contraintes en tension et en courant. On présente la compensation par inductance qui permet l'augmentation des longueurs de liaison réalisables et une amélioration de la qualité du transport. * Les méthodes de calcul de la capacité de transport des câbles (l'intensité maximale du courant admissible sans dégradation) sont analysées pour les différents modes de pose. . Une méthode d'optimisation des liaisons mixtes aéro-souterraines est proposée. Elle est basée sur l'analyse de l'adéquation des capacités de transport des lignes aériennes et des câbles souterrains en régime normal et en régime perturbé. * On discute les différents facteurs (investissements, pertes...) entrant en jeu dans le bilan économique. Cette étude est concrétisée par un logiciel qu a pour but de faciliter l'optimisation technico-économique des liaisons souterraines.
Author: Michel Lambert Publisher: ISBN: 9782100563210 Category : Languages : fr Pages : 242
Book Description
Les cahiers des charges des réseaux d’énergie électrique comportent des normes contraignantes au sujet de la protection des personnes et des matériels. En électricité les “régimes de neutre” et les “schémas de liaison à la terre” définissent les modes de raccordement à la terre et aux masses. Ils ont pour but de maîtriser les défauts d’isolement par éloignement ou par utilisation de matériaux isolants. Cet ouvrage est d’abord un outil d’analyse et de compréhension des déséquilibres électriques. Il fournit ensuite un inventaire des dispositions qui doivent être prises en cohérence avec le choix du régime de neutre.
Author: Renate Mayntz Publisher: Routledge ISBN: 1000315878 Category : Social Science Languages : en Pages : 238
Book Description
This book is an outcome of the conference on the development of large technical systems held in Berlin in 1986. It focuses on the comparative analysis of the development of large technical systems, particularly electrical power, railroad, air traffic, telephone, and other forms of telecommunication.
Author: Don Montague Publisher: Taylor & Francis ISBN: 9780419199106 Category : Architecture Languages : en Pages : 472
Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author: Jacqueline Ki-Zerbo Publisher: Univ of California Press ISBN: 9780520066960 Category : History Languages : en Pages : 372
Book Description
"This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Author: Richard Swedberg Publisher: Russell Sage Foundation ISBN: 9780871548405 Category : Business & Economics Languages : en Pages : 506
Book Description
Since the mid-1980s, as public discourse has focused increasingly on the troubled economy, many social scientists have argued the need for more analysis of the social relationships that undergird economic life. The original essays in Explorations in Economic Sociology represent the most important work in this renewed field and employ a rich variety of research methods—theoretical, ethnographic, and historical—to illustrate its key concerns. Explorations in Economic Sociology forges innovative social theories of such economic institutions as money, markets, and industry. Although traditional economists have identified markets as driven solely by the forces of supply and demand, social factors frequently intervene. Sales at auction are determined not simply by a seller's personal knowledge of customers. Shareholder attitudes and employee organization influence everything from the way firms borrow money to the way corporate performance is measured. Firms themselves operate in social networks in which trust is a crucial factor in settling the terms for cooperation or competition. Throughout the essays in this volume, the contributors point the way to developing a more healthy economy by fostering productive industrial networks, avoiding disintegration at management levels, and anticipating the consequences of the shift from manufacturing to service industries. Explorations in Economic Sociology is a pioneering work that bridges the gap between social theory and economic analysis and demonstrates the importance of this union in achieving an effective understanding of economic issues. The book should stimulate new interest in economic sociology by bringing together many of its most fundamental voices.
Author: Octave Mirbeau Publisher: Library of Alexandria ISBN: 1465606947 Category : Fiction Languages : en Pages : 219
Book Description
One evening some friends were gathered at the home of one of our most celebrated writers. Having dined sumptuously, they were discussing murder—apropos of what, I no longer remember probably apropos of nothing. Only men were present: moralists, poets, philosophers and doctors—thus everyone could speak freely, according to his whim, his hobby or his idiosyncrasies, without fear of suddenly seeing that expression of horror and fear which the least startling idea traces upon the horrified face of a notary. I—say notary, much as I might have said lawyer or porter, not disdainfully, of course, but in order to define the average French mind. With a calmness of spirit as perfect as though he were expressing an opinion upon the merits of the cigar he was smoking, a member of the Academy of Moral and Political Sciences said: “Really—I honestly believe that murder is the greatest human preoccupation, and that all our acts stem from it... “ We awaited the pronouncement of an involved theory, but he remained silent. “Absolutely!” said a Darwinian scientist, “and, my friend, you are voicing one of those eternal truths such as the legendary Monsieur de La Palisse discovered every day: since murder is the very bedrock of our social institutions, and consequently the most imperious necessity of civilized life. If it no longer existed, there would be no governments of any kind, by virtue of the admirable fact that crime in general and murder in particular are not only their excuse, but their only reason for being. We should then live in complete anarchy, which is inconceivable. So, instead of seeking to eliminate murder, it is imperative that it be cultivated with intelligence and perseverance. I know no better culture medium than law.” Someone protested. “Here, here!” asked the savant, “aren't we alone, and speaking frankly?” “Please!” said the host, “let us profit thoroughly by the only occasion when we are free to express our personal ideas, for both I, in my books, and you in your turn, may present only lies to the public.” The scientist settled himself once more among the cushions of his armchair, stretched his legs, which were numb from being crossed too long and, his head thrown back, his arms hanging and his stomach soothed by good digestion, puffed smoke−rings at the ceiling: “Besides,” he continued, “murder is largely self−propagating. Actually, it is not the result of this or that passion, nor is it a pathological form of degeneracy. It is a vital instinct which is in us all—which is in all organized beings and dominates them, just as the genetic instinct. And most of the time it is especially true that these two instincts fuse so well, and are so totally interchangeable, that in some way or other they form a single and identical instinct, so that we no longer may tell which of the two urges us to give life, and which to take it—which is murder, and which love. I have been the confidant of an honorable assassin who killed women, not to rob them, but to ravish them. His trick was to manage things so that his sexual climax coincided exactly with the death−spasm of the woman: 'At those moments,' he told me, 'I imagined I was a God, creating a world!”
Author: NIKO.. QAKO
Author: NIKO.. QAKO
Author: Ruyi Fang
Author: 
Author: Ruyi Fang
Author: Michel Lambert
Author: Renate Mayntz
Author: Don Montague
Author: Jacqueline Ki-Zerbo
Author: Richard Swedberg
Author: Octave Mirbeau