Browsing by Author "Opakunle James Akinpelu"
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Item Data-Driven Condition Assessment and Remaining Life Prediction of Low-Voltage Distribution Transformers Using Insulation Resistance Measurements: A Case Study of Ajayi Crowther University Distribution Network(IRE JOURNALS, 2026-06-01) Adenle, Johnson Gbadebo; Opakunle James Akinpelu; Obanisola Oluwole OlawaleThis paper presents a comprehensive insulation resistance (IR) assessment of low voltage distribution transformers at Ajayi Crowther University (ACU), Oyo, Nigeria. The study evaluates the safety, reliability, and operational efficiency of four distribution transformers (three 500 kVA units and one 750 kVA unit) through systematic IR testing using a Megger MIT1025 insulation tester. Testing was conducted in three configurations: Line-to-Earth (L-E), Neutral-to-Earth (N-E), and Line- to-Neutral (L-N), with results corrected to a standard temperature of 20°C and benchmarked against IEEE standards. Statistical analysis revealed an overall mean corrected IR of 137.5 MΩ with a standard deviation of 21.46 MΩ. Three transformers (T1, T3, and T4) demonstrated healthy insulation with corrected IR values ranging from 100 to 160 MΩ. However, transformer T2 exhibited localized insulation degradation, failing the L-N test with a corrected IR of 90 MΩ, below the IEEE minimum threshold of 100 MΩ. The findings indicate that while the university's electrical distribution system is largely in satisfactory condition, immediate corrective maintenance is required for T2.Item Techno-Economic Design and Simulation of a Hybrid Renewable Energy Micro-grid for Reliable Campus Electrification in Sub-Saharan Africa: A Case Study of Ajayi Crowther University, Nigeria(IJCER Journal, 2026-06-05) Adenle, Johnson Gbadebo; Opakunle James AkinpeluThis paper presents the design, simulation, and performance evaluation of a grid-connected hybrid renewable energy microgrid system for Ajayi Crowther University in Oyo, Nigeria. The system integrates wind turbines, solar photovoltaic panels, battery energy storage, and grid connection to address persistent challenges of unreliable national grid supply, high diesel generator costs, and environmental pollution. Using MATLAB/Simulink, HOMER Pro, and PSCAD simulation platforms, a comprehensive techno-economic analysis was conducted based on one year of meteorological data (April 2024 - April 2025) and detailed load profiling of the Engineering Faculty and Diocese of Lagos West (DLW) Female Hostel. The optimised system comprises 300 kW wind capacity (three 100 kW turbines), 250 kW solar PV, 600 kWh battery storage, and 700 kW inverter capacity. Simulation results demonstrate that the hybrid system achieves a 74.3% renewable energy fraction, generating 817,820 kWh annually from renewable sources while reducing grid dependency to 25.7%. The system delivers annual CO emission reductions of 436.7 tonnes and demonstrates economic viability with a levelised cost of energy of $0.198/kWh and a payback period of 12.3 years. This study contributes to the growing body of knowledge on hybrid microgrid applications in Sub-Saharan African university campuses and provides a replicable framework for similar institutional electrification projects in developing regions