Worked on the e2nIEE/pandapower repository to enhance transformer impedance calculations for short-circuit analysis, focusing on IEC 60909-0:2016 compliance. Addressed a critical bug by ensuring the K_T correction factor is applied only in the maximum short-circuit case, improving the reliability of downstream simulations. Updated the Python test suite to support Python 3.14, including syntax adjustments such as raw strings for regular expressions and expanded test coverage for minimum and maximum cases. Leveraged skills in data analysis, electrical engineering, and testing to strengthen end-to-end correctness, prioritizing standards compliance and risk reduction over new feature development during this period.