TY - BOOK AU - Bulong, Mark Jansenn V...et.al. TI - Assessing the impact of different grounding systems on the power quality of Mariano Marcos State University- College of Engineering Electrical Distribution System / PY - 2024/// CY - City of Batac : PB - MMSU N1 - UTHESIS ( Bachelor of Science in Electrical Engineering); Bibliography: leaves 117-121 N2 - Grounding is an important part of an electrical system as it provides electrical path from the system to the ground. It helps prevent electrical shocks, reduces the risk of equipment damage from lightning or power surges, and provides a path for fault currents to safely dissipate, minimizing the risk of fire. But depending on the transformer configuration, the needed grounding system may vary. Currently, the College of Engineering’s electrical distribution system operates under an open-delta transformer configuration which has been deemed inefficient by the cited literatures and by the power quality assessment conducted on this study as it failed to meet multiple standards. Originally, the system was designed to run on a wye delta transformer configuration. This study used the said system and simulated it under different grounding systems, namely solidly grounded, resistance grounded, and ungrounded system, using electrical analysis program. The simulation results show that in a wye-delta system, it is safer to unground the wye side as it has been found that grounding provides a path for backfeed short circuit current to flow. This could affect the power quality of the system in terms of voltage stability, harmonics and transient stability as proved by the literatures cited ER -