EVALUATION OF OUTAGE MANAGEMENT AND RELIABILITY INDICES OF UGBOWO 2X15 MVA, 33/11 KV DISTRIBUTION NETWORK
Keywords:
Availability, Reliability indices, Costumers Oriented indices, Failure rate, Outage managementAbstract
This paper presents the outage management and reliability indices (RI) assessment of the four 11 kV feeders of the Ugbowo 2x15 MVA, 33/11 kV distribution network. The data of daily outages of the four 11 kV feeders from February 2021 to January 2022 were collated and collected from the network. The daily outage of the four 11 kV feeders were used to compute the monthly and yearly outages and performance indices of the four 11 kV feeders of the network using analytical techniques. The monthly and yearly failure rate, MTTR, MTTF, MTBF, availability, unavailability, SAIFI, SAIDI, ASAI, etc. for the period of twelve (12) months were analyzed using the Load Point Indices (LPI) and the Microsoft Excel was used graphically to interpret the results of the indices for the four 11 kV feeders of the network. The results obtained from the analyses of the four 11 kV feeders of the network showed that the yearly failure rate for the FGGC feeder is 20.66%, Uselu feeder 20.66%, Eguaedaiken feeder 21.38%, and Ugbowo feeder 20.75% respectively. The RI values for the various metrics of the FGGC, Uselu, Eguaedaiken and Ugbowo feeders respectively were MTTR 5.626 hrs, 5.626 hrs, 4.383 hrs and 4.491 hrs; MTTF 4.840 hrs, 4.840 hrs, 4.677 hrs and 4.819 hrs; MTBF 10.466 hrs, 10.466 hrs, 9.059 hrs and 9.309 hrs respectively. And also, the customers oriented indices for the four 11 kV feeders respectively was SAIFI 1.288, 0.338, 0.332 and 0.291 interruptions/cu.yr respectively, SAIDI 7.245, 1.899, 1.454 and 1.306 hours/cu.yr respectively, ASAI 46.2, 46.2, 51.6 and 51.8% respectively. These results revealed an improvement of the network compared to Akpojedje et al. [10] assessment carried out on same network but despite the
improvement per-se, the performance indices of the four 11 kV feeders with the annual total outage frequency (SAIFI) and percentage availability (ASAI) were far from the recommended values of the international acceptable standard value (IASV) of 0.01 and 99.99% respectively. This shows that more improvement is needed on the network.
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