AVALIAÇÃO DA CONFORMIDADE TÉCNICA DE UMA SUBESTAÇÃO DE EXTRA ALTA TENSÃO SEGUNDO A NR-10, NBR 5419-3 E O SUBMÓDULO 2.6 DO ONS: um estudo de caso

Abstract

The safe and standardized operation of high-voltage substations is essential to ensuring the reliability of the Brazilian Interconnected Power System (SIN), since technical inadequacies may compromise operational stability, increase the likelihood of failures, and affect the continuity of electricity supply. In this context, assessing whether installations comply with the regulatory requirements that ensure adequate performance, operator safety, and equipment integrity becomes particularly important. This study presents the application of Submodule 2.6 of the Grid Procedures of the National System Operator (ONS) in the technical compliance assessment of a high-voltage substation belonging to the Basic Network, using as a case study a 230 kV step-down substation. In addition to the requirements of Submodule 2.6, the minimum safety distances established by NR-10 and the conformity of the lightning protection system according to NBR 5419-3 were also verified. The methodology includes the systematic review of as-built design documents, descriptive reports, datasheets, and complementary technical records, comparing them with specific normative requirements regarding busbar arrangement, continuous current capacity, short-circuit withstand capability, insulation coordination, power transformer unit, circuit breakers, disconnect switches, and surge arresters. The results indicate full compliance with ONS requirements, highlighting the importance of pre-operational verification as a tool to ensure standardization, safety, and reliable performance of facilities connected to the SIN. The study demonstrates that the structured application of regulatory criteria contributes to mitigating operational risks and ensuring proper equipment sizing.