Reliability Assessment of Transmission Power System: A Case Study of Ajaokuta 132/33 kV Substation Feeders

Authors: Adeyemi, L.O., Adefarati, T., Alabi, G.S., Bawonda, F.I., Onipe, J.A., Adawudi, M.A., Adama, I.A., Sadiq, H.M., Borisade, S.G. And Oloye, A.O.

DOI Info: http://doi.org/10.5281/zenodo.12600797

ABSTRACT

The reliability of power supply at the load points has become a global phenomenon owing to ever increasing load demand occasioned by industrial revolution, high standard of living and introduction of high tech equipment for several applications. Reliability is an important tool to measure the ability of power system to perform its intended functions under stated environmental condition for a specified period of time. The aim of this study is to carry out a reliability assessment of transmission power system using Ajaokuta 132/33kV feeder substation as a case study. The exponential distribution model and reliability block diagram are adopted in this study to assess the reliability of substation feeders and associated components. It can be established from the study that confluence feeder has the highest outage frequency and outage duration of 117 and 700.6 hrs while steel plant feeder has the lowest outage frequency and outage duration of 24 and 152.27 hrs. The reliability performance metrics of the substation such as failure rate, availability, meant time before failure and mean time to repair are computed to be 0.06278 f/hr, 0.99983, 49672 hrs and 83.70 hrs. The results show that the substation is not reliable and has poor feeders’ availability. The major causes of outage were earth fault, open circuit fault, ageing components and over load. The substation is underutilized; therefore there is need for the expansion of distribution networks. The results of the research can serve as a model to determine the reliability of any substation on the global note.

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