André Eugênio Lazzaretti

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This paper presents a method for automatic classification of faults and events related to quality of service in electricity distribution networks. The method consists in preprocessing event oscillographies using the wavelet transform and then classifying them using autonomous neural models. In the preprocessing stage, the energy present in each sub-band of(More)
The identification of nonlinear systems with artificial neural networks models has been successfully used in many applications. Most processes in industry are characterized by nonlinear and time-varying behavior. In this context, the identification of mathematical models for nonlinear systems is vital in many fields of engineering. The Radial Basis Function(More)
The identification of non-linear systems by artificial neural networks has been successfully applied in many applications. In this context, the radial basis function neural network (RBF-NN) is a powerful approach for non-linear system identification. An RBF neural network has an input layer, a hidden layer and an output layer. The neurons in the hidden(More)
This paper proposes a new approach to motion segmentation from video sequences acquired using a single camera, whose aim is to identify which components are due to pure egomotion and which components are due to independent moving objects within the observed motion field. The model has three main steps, namely computation of the optical flow field,(More)
This article describes the development of a R&D project of a distribution transformer with integrated electricity measuring system. The system has as main objective the energy measurement of the transformers customer consumption and offers various information related to electrical distribution network to the utility and informs in real time the(More)
This paper describes the development of a prototype of an enclosure for a fuse cutout, for distribution networks of class 15 kV and 36.2 kV. The purpose of the enclosure is to protect the fuse cutout against third party intervention and ensure that only linemen will be able to perform maneuvers and maintenance. Besides protecting the fuse cutout, the(More)
This work presents a performance comparison method for wavelet based compression of three-phase signals. Input signals are simulated on ATP software, while the mother wavelets, compression thresholds and transform detail levels are changed. Thousands of compressed output signals are thus obtained, and the compression rate and error are calculated. These(More)