DISTANCE PROTECTION PERFORMANCE ANALYSIS IN SHORT AND LONG TRANSMISSION LINES USING REAL TIME DIGITAL SIMULATION

The purpose of this article is to present a performance analysis of the distance protection applied on short and long transmission lines of Companhia Energética de Minas Gerais - CEMIG (a Brazilian Electrical Company). The analysis was based on the simulations results of numeric protective relay on power transmission lines, in September 02 to 06, 2002, at SIEMENS AG's facilities (Erlangen - Germany), using Real Time Digital Simulator (RTDS™). Several types of faults simulations were accomplished, in several conditions of the electrical power system where the protective relays would be installed. The results are presented not only with the times of faults elimination, but also with all functionality and advantages that these modern devices make possible to the electrical power system.