Comparative Analysis of Surge Capacitor Placement Options for Three Single-Phase Transformers Bank in STATCOM Projects

This study delves into the integration of surge arresters and capacitors within Dynamic Reactive Power Compensator (DRPC) projects to safeguard critical equipment such as transformers. A key focus is the challenge of identifying the optimal placement for surge capacitors (SC), complicated by the absence of standardized guidelines. Various installation scenarios are explored, including connecting surge capacitors post delta connection on the bus bar or situating them at transformer terminals. Emphasizing adherence to international standards, the research underscores the significance of positioning surge capacitors in close proximity to transformer terminals.The paper's novelty lies in the experimental evaluation of these installation configurations using PSCAD as an Electromagnetic Transient (EMT) simulation tool to propose the most effective solution. Both of switching over voltage study (SOV) and very fast transient overvoltage study (VFTO) have been performed to investigate the best surge capacitor installation way in certain actual implemented project. The main contribution of the paper is the proposal of SC installation that satisfies both of technical and economical consideration. This investigation, pertinent to STATCOM initiatives in Saudi Arabia, targets enhancing insulation coordination for optimized project performance.