Estudo de confiabilidade aplicado à análise de alternativas de projeto de subestação industrial 69-13,8 kV baseado no modelo de Markov e análise de falha

Abstract

The reliability study, applied to the analysis of alternatives for industrial substation design, seeks to subsidize the engineering planning of companies in the face of technological advances in the area of protection of electrical systems. Such planning aims to minimize the huge financial losses caused by interruptions in the supply of electricity. The main strategy to mitigate the consequences of electrical failures is to modernize industrial substations. In this sense, the IEC 61.850 standard presents a communication standard that promotes interoperability between Intelligent Electronic Devices (IED) from different manufacturers. In addition, the level of reliability of substation topologies with different operational resources has been studied. In this context, this work presents a reliability study that analyzes protection scenarios with the adoption of IEC 61.850 in different design alternatives for a 69-13,8 kV industrial substation. This substation once had numerous interruptions in the supply of electricity. Therefore, it is necessary to study the concepts and phases of the reliability study applied to the electrical system, evaluate how the IEC 61.850 impacts on the reliability of the substation, stochastically model the scenarios for study, and analyze alternatives for substation design for engineering planning . The Fault Tree Analysis (FTA) methodology is used in conjunction with the Markov model, using the software TopEvent FTA and MS Excel as a tool. Through this methodology, it is possible to compare reliability indicators for different alternatives for the 69-13,8 kV industrial substation project. In addition, it appears that the adoption of logical selectivity, according to the IEC 61.850 standard, increases the level of reliability of the substation.