Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

Electrical energy is polymorphic, with voltage levels varying between a few volts to MVs and frequencies from a few Hz to MHz. This variability offers flexibility of use. For engineering applications, the choices of electrical parameters are dictated by technical and/or economic criteria. For example: - In aviation, frequencies from 400 Hz to a few kHz are used. - Energies produced at power stations are increased to kV levels with the step-up transformers to reduce Joule losses in long-distance transportations [1,2]. Consequently, many AC–DC transmission line projects up to 1200 kV have been constructed or are under way in many countries [3–15]. The application of high voltage in electrical power transmission is the most common, but electrical engineers also use this know-how in many other fields (e.g., [15–21]). Table 1 lists some of the main applications.