Power System Design, Operation & Protection Assignment - EE467/EE967

This report presents a comprehensive solution to a power systems assignment, addressing key aspects of power system design, operation, and protection. The first part of the report focuses on transformer differential protection, detailing its operation, CT ratio selection, and relay settings. The analysis includes fault scenarios and relay statuses for different phases. The second part explores power system stabilizers (PSS), explaining their role in enhancing rotor oscillation damping. It covers the function of various PSS blocks, including washout, phase compensation, gain, and stability output limiters. Furthermore, the report discusses different PSS input types, such as speed and frequency-based inputs, highlighting their advantages and disadvantages. Finally, the report applies the equal area criterion to assess power system stability, calculating the critical clearing time based on pre-fault, during-fault, and post-fault conditions. The report includes relevant formulas, calculations, and references to support the analysis.