Two-Wire Distribution System for Supplying Three-Phase Rural Loads
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Two-Wire Distribution System for Supplying Three-Phase Rural Loads Juliane C. O. Fandi · José Rubens Macedo Jr. · Isaque N. Gondim · José Carlos de Oliveira · Geraldo Caixeta Guimarães
Received: 12 November 2012 / Revised: 18 February 2013 / Accepted: 16 March 2013 / Published online: 20 April 2013 © Brazilian Society for Automatics–SBA 2013
Abstract Currently, the supply of electricity to rural districts is realized, in almost all cases, through single-phase medium-voltage overhead distribution lines. However, some of these installations will eventually demand the use of more expressive electrical loads, which makes the use of threephase distribution systems a necessity, thus bringing about the substitution of the existing single-phase network. Some of the more usual techniques, based on power electronics, make the supply of three-phase loads possible from converters especially developed for single- to three-phase transformation. In this context, this article presents a new and innovative low-cost methodology, based on electromagnetic arrangements, without the use of power electronics, for attending to rural three-phase supply needs through the use of a new overhead two-wire distribution system. Keywords Rural distribution systems · Single-three-phase conversion · Rural three-phase loads
J. C. O. Fandi Department of Electrical Engineering, UFTM, Av. Frei Paulino, 30, Uberaba, MG, Brazil e-mail: [email protected] J. R. Macedo Jr. (B) · I. N. Gondim · J. C. de Oliveira · G. C. Guimarães Faculty of Electrical Engineering, UFU, Av. João Naves de Ávila, Campus Santa Mônica, Uberlândia, MG 2121, Brazil e-mail: [email protected] I. N. Gondim e-mail: [email protected] J. C. de Oliveira e-mail: [email protected] G. C. Guimarães e-mail: [email protected]
1 Introduction The characteristics of electric energy consumers, along with financial limitations for investments in rural electrification programmes, have pushed electric energy companies to rely on the use of single-phase energy distribution systems. Some of the features associated with such systems are low monthly consumption, low consumer density and few simultaneous maximum demands. The development of new techniques for irrigated agriculture, as well as the benefit of locally produced products, has placed upon the rural producers the need to increase their energy consumption, particularly when dealing with maximum demand. However, the use of the single-phase system currently available forces the rural agricultural producer to take on the limitations and peculiarities inherent to the system. As it currently stands, a significant load increase to any rural consumer would depend upon the substitution of the existing medium-voltage overhead network, for a new threephase network, thus burdening the consumer to the extent that investments earmarked for the increased production become unfeasible. However, the limitation associated with the load increase of rural consumers, lies solely upon the single-phase transformer and not the single-phase medium-vol
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