Análise do funcionamento das funções 51, 27, 59 e 87 em diversas condições de curto-circuito de uma linha de transmissão de alta tensão utilizando o software ATPDraw

Abstract

The present study investigates, through the implementation in the ATPDraw software, the behavior of four functions commonly used in the protection of high-voltage transmission lines: overcurrent (51), overvoltage (59), undervoltage (27), and differential (87) functions. ATPDraw, a program used for simulating electromagnetic transients in power systems, servesas a tool to study the behavior of these protection functions under different fault scenarios. It offers a practical and detailed approach, enabling the modeling of transient behavior in electrical systems and the evaluation of how different protection strategies can mitigate interruption risks, contributing to a safer and more reliable electrical grid. The results revealed that the performance of protection functions is strongly influenced by operating conditions, such as the type of short circuit (monophase or three-phase), fault resistance, and fault location. While functions like 87 proved to be highly effective and consistent across all tested scenarios, current- or voltage-based functions such as 51, 27, and 59 exhibited variations under specific conditions, such as high fault resistance or fault locations. These findings highlight the importance of precise adjustments and the integration of diverse protection strategies to maximize system reliability and safety. The research concludes that simulation tools like ATPDraw are essential for validating protection settings and enhancing the performance of complex electrical systems.