Hydro-Québec

About: Hydro-Québec is a government organization based out in Montreal, Quebec, Canada. It is known for research contribution in the topics: Electric power system & Dielectric. The organization has 2596 authors who have published 4433 publications receiving 100878 citations.

Distribution of self-generated current in laser-produced plasmas

Abstract: The current associated with the self-generated magnetic field has been measurd in air and nitrogen at various pressures in a 4-J, 30-nsec-Nd-laser- produced plasma by using a fast probe embedded in the copper target. The results reveal an active participation of the target in the current-flow process with anodic and cathodic regions, the source of the current (magnetic field) being at the plasma--target interface. (AIP)

Analysing the effects of different types of FACTS devices on the steady-state performance of the Hydro-Québec network

Abstract: Hydro-Quebec's electrical transmission system is an extensive, international grid located in Quebec, Canada with extensions into the northeastern United States of America. For large power systems such as this, one of the major issues is to maintain the steady-state performance of the network. From this point of view, flexible AC transmission system (FACTS) devices could be effective tools to improve power system security by reducing the power flow on overloaded lines, which in turn would result in an increased loadability of the power system, reduced transmission line losses, improved stability and security and, ultimately, a more energy-efficient transmission system. Therefore in this study, the authors will present the effects of different types of FACTS devices on the performance of Hydro-Quebec's power system. The optimal locations and rating of these FACTS controllers will be determined with a view to improving network security using an optimisation algorithm based on a genetic algorithm. The effects of six different FACTS devices including static VAR compensator (SVC), thyristor-controlled series capacitor (TCSC), thyristor-controlled voltage regulator (TCVR), thyristor-controlled phase-shifting transformer (TCPST), unified power flow controller (UPFC) and static synchronous compensator (STATCOM) with energy storage are compared. Using the presented results, the effects of different types of FACTS devices on the Hydro-Quebec network will be analysed and compared with those of a STATCOM equipped with energy storage from the viewpoints of static loadability and losses.

Rate Theory and Polyethylene Relaxations

Abstract: Polyethylene relaxation results are shown to be described very well by the rate theory associated with the name of Eyring. In agreement with this theory the oa, B, and ? relaxations have constant AH and AS values as long as the results are plotted properly, i. e. as log(?/T) vs 1/T. Since AS values are far from being negligible this means that the energy parameter typical of a given relaxation is the Gibbs free energy change ?G. It is shown that the ?G values of the ? relaxation are linearly related with crystallinity and not with crystallite thickness. In agreement with our theoretical model, the activation enthalpy and entropy of each relaxation are linearly related - the compensation law. It is concluded that important information on polymer relaxations can be gained from the ?S-?H plots.

Effect of the Nickel Content in the Pitting of Stainless Steels in Low Chloride and Thiosulfate Solutions

Abstract: The effect of the nickel content on the pitting resistance of AISI 304 stainless steel (SS) and Alloys 800 and 600 in chloride-thiosulfate solutions was investigated using two techniques, ...