Modelagem de linha de transmissão de 345 kV no software ATPDraw para análises de transientes de sobretensão em dois barramentos
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Abstract
The modeling and simulation of transmission lines are essential to ensure the safe and efficient operation of electrical systems. This study aims to analyze transient overvoltages in a 345 kV transmission line connecting the Itabirito 2 and Ouro Preto 2 substations, spanning approximately 5 km, using the ATPDraw software. The research addresses a gap in the detailed analysis of overvoltage mitigation strategies in specific scenarios of energization, re energization, and the integration of compensatory devices. The methodology involved acquiring real parameters of the transmission line and substations, modeling based on the physical and geometric characteristics of the system, and simulating three distinct scenarios: energization, re-energization after a fault, and capacitor bank integration. For each scenario, peak voltage levels, waveform distortions, and the effectiveness of overvoltage damping methods, such as controlled switching and surge arresters, were analyzed. The results revealed that in the re-energization scenario following a fault without damping, peak overvoltages reached critical values of 5,67 pu (1.54 MV). The application of pre-insertion circuit breakers and surge arresters reduced this value to 1,43 pu, a decrease of 75%. In the capacitor bank integration scenario, controlled switching limited overvoltages to 1,04 pu, demonstrating its effectiveness and reliability. The use of modeling via software allowed simulations of hypothetical and real conditions of disturbances in the electrical system, enabling predictability and the study of effective protections. Therefore, the simulation results help in making decisions for future projects and improving the reliability of high voltage electrical systems.
