Support tool for establishing the technical analysis methodology for protection relay certification testing over time.

The certification of line protection relays is a critical process that has traditionally depended on years of operational experience; however, rapid technological evolution and frequent firmware updates have made maintaining up-to-date homologation criteria increasingly challenging, leading to difficulties in knowledge preservation and standardization. Manual testing under simulated or real fault conditions requires significant time and specialized resources and relies heavily on individual expertise, which complicates consistent evaluation and introduces risks when knowledge is not properly documented or transferred. To address these challenges, a rule-based Expert System was developed to systematize and preserve the methodology used in distance relay homologation. Implemented in Python, the system formalizes expert knowledge, evaluates relay digital outputs against expected behaviors, and processes COMTRADE files using predefined criteria while assessing key indicators such as selectivity, sensitivity, directionality, reliability, and operating time, thus ensuring uniformity across tests. The tool also supports training by generating diagnostic reports and visualizations that help new engineers learn standardized evaluation techniques. Validation was carried out through tests on relays from multiple manufacturers under varied network conditions, simulating sixteen fault scenarios, and its scalable architecture allows updates as technologies and standards evolve, reducing reliance on individual experts, improving training, and enhancing reliability in relay certification.