Reliability Assessment of Omu-Aran 132/33kV Transmission Substation feeders

The reliability of Omu-Aran 132/33kV Transmission Station, Omu-Aran Kwara State, and its associated 33kV feeders was investigated in this study. A situation awareness model was developed by considering customer-based and system-based reliability indices for the transmission station feeders between January 2015 - December 2020. Customer-based indices like System average Interruption frequency index (SAIFI), System average interruption duration index (SAIDI), Customer average interruption duration index (CAIDI), and Average service availability index (ASAI) were calculated for the station's outgoing 33kV feeders. System-based indices like failure rate, mean time between failure (MTBF), and Mean down Time (MDT) were also determined for the 33kV feeders. Results of the analysis showed that Otun 33kV feeder has the least mean SAIFI and SAIDI values of 0.0963interuption/customer and 0.2291hours/customer respectively. Customers on this feeder experience the least number of interruptions and the least duration of the sustained interruption. Omu-Aran 33kV feeder has the least CAIDI of 1.7809 interruptions/customer. Customers on this feeder experience the least number of continuous interruptions. Omu-Aran 33kV feeder also has the highest mean ASAI of 0.8359 and Isanlu-Isin 33kV feeder has the least mean ASAI of 0.5943 and requires special attention to improve supply availability to the customers on this feeder.