Sylvestre Prabakaran enhanced the powsybl/pypowsybl repository by developing an automatic detection feature for three-winding transformers within the sensitivity analysis module. This backend improvement, implemented in Java, expanded the analysis coverage and reduced manual configuration for power systems operators. Sylvestre updated Java context handling to integrate the new detector seamlessly and maintained compatibility with existing workflows. To ensure reliability, he added a Python test case that validated the new functionality, demonstrating cross-language validation and robust test automation. The work focused on backend development, power systems analysis, and testing, resulting in improved modeling fidelity and streamlined planning processes for grid studies.