Direccionalidad basada en Patrones obtenidos mediante la Transformada Wavelet para un Relé de Sobrecorriente instalado en una Línea de Transmisión

Abstract

This work shows a pattern model, which is capable of providing the characteristic of directionality to an overcurrent relay that is installed in a transmission line by monitoring only the current signal but getting by without the voltage one (reference signal), that is necessary in a conventional directional relay. The methodology is based mainly on the use of two mathematical tools: Wavelet Transform and Support Vector Machines. In addition, a second model which has the ability to identify the type of fault produced in the protected line is presented. The electrical test system was implemented in the ATP/EMTP program. Linking this program with MATLAB allowed to simulate several short-circuit fault types at different distances. The short-circuit faults were simulated in the transmission line protected by the relay, as well as in the line before it. The simulation results were grouped by class and then stored in a database. These files were processed and analyzed on MATLAB platform, in order to obtain the two models previously mentioned. Finally, a graphical interface was implemented so that the user can easily and didactically appreciate the developed methodology, as well as its effectiveness.