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Sao Leopoldo, Brazil

Bernardon D.P.,Federal University of Pampa | Sperandio M.,Federal University of Pampa | Garcia V.J.,Federal University of Pampa | Russi J.,Federal University of Pampa | And 3 more authors.
Electric Power Systems Research | Year: 2011

Continuity in power supply for the consumers is a permanent concern from the utilities, pursued with the development of technological solutions in order to improve the performance of network restoration conditions. Using remotely controlled switches corresponds to one possible approach to reach such an improvement and giving some convenient remote resources such as the fault detect, isolation and transfer loads. This paper presents a methodology implemented in a computer programming language for allocation these devices in electric distribution systems based on multi-criteria fuzzy analysis. The main contributions are focus on considering the impact of installing remote-controlled switches in the reliability indexes and algorithm of fuzzy multi-criteria decision making for the switches allocation. The effectiveness of the proposed algorithm is demonstrated with case studies involving actual systems of the AES Sul utility located in the south of Brazil. © 2010 Elsevier B.V. All rights reserved. Source


Napolitano F.,University of Bologna | Borghetti A.,University of Bologna | Messori D.,University of Bologna | Nucci C.A.,University of Bologna | And 3 more authors.
IEEJ Transactions on Power and Energy | Year: 2013

The assessment of the lightning performance of a compact configuration of MV overhead lines that is expected to be adopted in the near future by an electricity distribution company in a Brazilian region characterized by high keraunic levels is presented. The compact configuration is characterized by the presence of an unenergized wire that has the main function to sustain the spacers of the phase conductors. As the wire could be periodically grounded, the paper analyses its effectiveness in reducing the overvoltages due to indirect lightning. The results are compared with those relevant to a conventional configuration of MV overhead lines now adopted by the same distribution company. The effects of the presence of surge arresters along the line are also analysed. © 2013 The Institute of Electrical Engineers of Japan. Source


Bernardon D.P.,Federal University of Pampa | Sperandio M.,Federal University of Pampa | Garcia V.J.,Federal University of Pampa | Canha L.N.,Federal University of Santa Maria | And 2 more authors.
IEEE Transactions on Power Delivery | Year: 2011

Continuity in power supply for the consumers is a permanent concern from the utilities, pursued with the development of technological solutions in order to improve the performance of network restoration conditions. Using remotely controlled switches corresponds to one possible approach to reach such an improvement and gives some convenient remote resources, such as the fault detect, isolation, and transfer loads. This paper presents a methodology implemented in a computer programming language for allocation of these devices in electric distribution systems based on the analytic hierarchical process (AHP) method. The main contributions focus on considering the impact of installing remotely controlled switches in the reliability indices and the AHP decision-making algorithm for the switches allocation. The effectiveness of the proposed algorithm is demonstrated with case studies involving actual systems of the AES Sul utility located in Southern Brazil. © 2011 IEEE. Source


Garcia V.J.,Federal University of Santa Maria | Bernardon D.P.,Federal University of Santa Maria | Abaide A.,Federal University of Santa Maria | Fonini J.,AES - Sul Company
Proceedings of the Universities Power Engineering Conference | Year: 2014

Since maintenance crews help to maintain the network under normal conditions, i.e., all the customers with power supply and non-technical problems associated with the electric network, emergency orders are normally related to equipment failures, overload conditions and interrupted conductors. In this paper it has been presented an evaluation of multicriteria scenarios to schedule emergency orders in electric distribution utilities. First the problem definition is pointed out, followed by the proper description of the criteria to be adopted when planning the schedule of emergency orders. Finally, the computational experiments and conclusions are presented including actual cases. © 2014 IEEE. Source


Napolitano F.,University of Bologna | Borghetti A.,University of Bologna | Nucci C.A.,University of Bologna | Martinez M.L.B.,Federal University of Itajuba | And 2 more authors.
Electric Power Systems Research | Year: 2014

AES Sul, a Brazilian electric distribution utility, has recently started a project focused on the installation of neutral resonant grounding devices at the medium voltage side of some substation transformers previously operated with solid grounded neutral. As a consequence of the expected increase of the voltage in the sound conductors during phase to ground faults, all the surge arresters must be replaced with ones with increased rating. In order to minimize the number of required surge arresters, a procedure has been developed for the estimation of the annual number of lightning events causing concomitant faults in more than one phase conductor. The paper describes the procedure, which takes into account all the main factors that have a significant influence on line insulation flashovers caused by lightning, and presents results obtained for the case of an overhead line with and without protection means. © 2014 Elsevier B.V. Source

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