Desarrollo de una herramienta computacional para el análisis y evaluación comparativa del desempeño de la protección diferencial de línea.

Abstract

The principle of differential current is one of the most effective methods for detecting fault currents in a line of an electrical system. Generally, distribution companies use the line differential protection function (87L) of their Intelligent Electronic Devices (IEDs) based on the factory settings, therefore, its parameterization is not specific to the line being protected. This function requires a periodic review of its settings due to the continuous change of the topology in the subtransmission and distribution networks. In this aspect, protection coordination studies that define their adjustments become difficult, since it is not possible to generalize an operating characteristic for all commercial IEDs. In this work, a computational tool is implemented in MATLAB that contains the operating algorithms of the 87L function of the main commercial IED manufacturers. In addition, it allows you to analyze and compare the operating characteristics of the 87L function and establish the one that presents the best performance by entering files in COMTRADE format of real or simulated events. For the cases of simulated events, the modeling of a specific electrical distribution system is carried out in the ATP and DIgSILENT software, to subsequently obtain a database of transient files and carry out their processing and analysis. This is intended to increase the sensitivity and reliability of the IEDs that protect the subtransmission and distribution lines, and reduce the post-failure analysis times of the 87L. function.