Avaliação do Desempenho da Proteção de Distância Utilizando o Barramento de Processos
Keywords: Electrical systems, digital substations, distance protection, IEC 61850, process bus
AbstractThe presence of telecommunications and intelligent devices is increasing in electrical systems. With the IEC 61850 standard, the topology of electrical substations is being modified to the known digital substations. These substations are divided into process, bay, and station levels. With this new topology, there is a need for detailed studies about the behavior of protection, control, and supervising functions to analyze if these functions will not lose performance. Protection functions impose significant challenges with the implementation of the process bus. Important evaluation points are the correct operation of these functions, acting time and fault clearing times, and behavior during process bus contingencies. This paper analyzes the dynamic performance of distance protection using the process bus. The main evaluated points are its acting time, fault clearing times, and performance during process bus contingencies. The results show that the use of the process bus presents an error of 1,96 % compared to the conventional topology in the fault clearing time. In the cases considering concurrent traffic in the process bus, the maximum error is 2,38 %, thus concluding that the process bus does not significantly influence the protection performance.