Sao Leopoldo, Brazil
Sao Leopoldo, Brazil

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Napolitano F.,University of Bologna | Borghetti A.,University of Bologna | Nucci C.A.,University of Bologna | Martinez M.L.B.,Federal University of Itajubá | 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.


Borghetti A.,University of Bologna | Napolitano F.,University of Bologna | Nucci C.A.,University of Bologna | Tossani F.,University of Bologna | And 4 more authors.
2014 International Conference on Lightning Protection, ICLP 2014 | Year: 2014

The papers addresses the problem of locating surge protective devices in a medium voltage distribution network by means of an accurate computer model for the calculation of lightning induced overvoltages and a Monte Carlo statistical procedure. The indirect lightning performance of small network cells of different configuration are evaluated and used as a benchmark for the validation of the surge arrester locations provided by a genetic algorithm procedure. The obtained results appear useful for the lightning protection design of networks with complex topology. © 2014 IEEE.


Borghetti A.,University of Bologna | Napolitano F.,University of Bologna | Nucci C.A.,University of Bologna | Martinez M.L.B.,Federal University of Itajubá | And 2 more authors.
2012 31st International Conference on Lightning Protection, ICLP 2012 | Year: 2012

A joint research project between AES Sul, the Federal University of Itajubá and the University of Bologna aims at defining the required protections against lightning-originated overvoltages in a resonant grounded distribution system in order to achieve the adequate lightning performance level with minimum cost. The paper aims at illustrating the effectiveness of the presence of a surge arrester or an arcing-horn gap and its protective zone by means of simulations obtained with a computer code for the calculation of lightning induced voltages that takes also into account the steady-state voltage. The results of a statistical analysis for a single multiconductor line are eventually presented and discussed. © 2012 IEEE.


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.


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.


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.


Vidor F.L.R.,Pontifical Catholic University of Rio Grande do Sul | Pires M.,Pontifical Catholic University of Rio Grande do Sul | Dedavid B.A.,Pontifical Catholic University of Rio Grande do Sul | Montani P.D.B.,AES - Sul Company | Gabiatti A.,AES - Sul Company
IEEE Transactions on Power Delivery | Year: 2010

This work aims to test an inspection method for wooden utility poles based on a classification system according to qualitative (visual and sounding) and quantitative parameters (excavation and drilling) to assess internal/external wood decay. Ten thousand poles were inspected, distributed over 23 cities in the state of Rio Grande do Sul (Southern Brazil). The results indicated a significant quantity of poles in advanced decay (14%) with a great variability among cities. Poles treated with chromated copper arsenate (CCA) presented worse conservation when compared to creosote preserved poles, suggesting possible problems on CCA treatment. © 2009 IEEE.


Dos Santos L.L.C.,Federal University of Santa Maria | Canha L.N.,Federal University of Santa Maria | Bernardon D.P.,Federal University of Santa Maria | Pressi R.A.,AES - Sul Company
Proceedings of the Universities Power Engineering Conference | Year: 2015

The brazilian electric power generation system is based on large hydroelectric plants, which are located far from consumers, being connected to these by transmission lines. In recent years it has had an incentive for the use of renewable sources of electricity, aiming at diversification of energy sources and reduction of environmental impacts caused by large plants. The new regulations reinforce this incentive including the application of distributed generation in low and medium voltage consumers (Normative Resolution N° 482 / ANEEL). The purpose of this paper is to map the energy potential in the South of Brazil, exploring how distributed generation technologies, the wind energy, solar, biomass and hydro, for long-term forecasting to insertion of DG (Distributed Generation) in distribution systems (medium and low voltage). © 2015 IEEE.


Jorge V.A.M.,Federal University of Rio Grande do Sul | Sarmiento W.J.,University of Cauca | Maciel A.,Federal University of Rio Grande do Sul | Nedel L.,Federal University of Rio Grande do Sul | And 3 more authors.
Proceedings of the ACM Symposium on Virtual Reality Software and Technology, VRST | Year: 2013

Any human-computer interface imposes a certain level of cognitive load to the user task. Analogously, the task itself also imposes different levels of cognitive load. It is common sense in 3D user interfaces research that a higher number of degrees of freedom increases the interface cognitive load. If the cognitive load is significant, it might compromise the user performance and undermine the evaluation of user skills in a virtual environment. In this paper, we propose an assessment of two immersive VR interfaces with varying degrees of freedom in two VR tasks: risk perception and basic object selection. We examine the effectiveness of both interfaces in these two different tasks. Results show that the number of degrees of freedom does not significantly affect a basic selection task, but it affects risk perception task in an unexpected way. Copyright © 2013 ACM.


Santos L.L.C.,Federal University of Santa Maria | Canha L.N.,Federal University of Santa Maria | Bernardon D.P.,Federal University of Santa Maria | Neto N.K.,Federal University of Santa Maria | Pressi R.A.,AES - Sul Company
2015 IEEE PES Innovative Smart Grid Technologies Latin America, ISGT LATAM 2015 | Year: 2015

The Brazilian generation system is based on large plants, usually dams located far from load centers, connected to these transmission lines. However, there is an incentive for the use of renewable energy sources distributed to diversify the energy matrix and reduce environmental impacts. The new regulations reinforce this incentive also including the application of distributed generation in low voltage through the consumer (Normative Resolution No. 482 / ANEEL). The purpose of this work is to map the energy potential in Southern Brazil, exploring distributed generation technologies such as wind, solar, biomass and hydro. Then, one should analyze the influence of the inclusion of distributed generation in the planning studies of electrical power distribution systems, both in medium and low voltage. © 2015 IEEE.

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