Isaac Samuel ^* Daudu Afah Toyin Tobiloba Somefun ^* Ayokunle Awelewa Shehu Abba-Aliyu

• Covenant University, Ota, Nigeria

Power quality is a global concern, particularly as electronic devices increasingly support modern economies. This research evaluates and proposes improvements for power quality on the distribution network at Covenant University, where electrical equipment usage contributes to power quality challenges. Measurements and evaluations were carried out in three stages: first, measuring power quality at five campus powerhouses using a Circutor aR6 power analyzer; second, assessing these measurements with Power Vision software; and third, simulating the evaluated network with NEPLAN software. The study was conducted during an active school session, with measurements taken at 500kVA, 11kV/415V/230V on the outgoing circuits for each transformer. The results were benchmarked against IEEE power quality standards, identifying issues such as harmonics, total harmonic distortion (THD), overload, and a lagging power factor. The proposed improvements, derived from NEPLAN simulation, included active harmonic filters to reduce harmonics, a shunt capacitor for power factor correction, and load sharing for managing transformer overloads. Simulation results demonstrated that the THD was significantly reduced across all powerhouses: CDS from 7.28% to 0.91%, EIE from 10.52% to 3.54%, CST from 16.03% to 0.58%, the Library from 11.92% to 0.12%, and the Male Hostel from 16.71% to 0.24%. These adjustments enhanced THD within specified limits. Additionally, the shunt capacitor raised the power factor to 0.96 (from -0.96). These enhancements are expected to extend equipment life, reduce heat loss, and lower utility costs.