Performance Evaluation of Ugbowo 33/11KV Distribution Network Based on SAIFI, SAIDI, CAIDI, ASAI, And ASUI

The reliability of electric power distribution networks is a critical determinant of service quality, consumer satisfaction, and socio-economic development. In Nigeria, frequent power interruptions and voltage instabilities remain persistent challenges that hinder the performance of distribution systems. This study focuses on the Evaluation of Reliability Indices for the Ugbowo 33/11kV 11kV injection distribution network, which has been characterized by frequent outages and high downtime. Outage data from four feeders—FGGC, Uselu, Eguadiaken, and Ugbowo—were collected over a three-year period (January 2018–December 2018). The data were analyzed of the customer-oriented indices and the results were compared with IEEE standard values for validation.

Reliability indices deviated significantly from IEEE standards, recording SAIFI at 23.5%, SAIDI at 475.6%, CAIDI at 92.4%, and ASAI at 48.7%. Comparisons between IEEE-based analyses showed huge differences confirming that the substation has poor performance.

The study concludes that power reliability in Ugbowo is considerably below international benchmarks, with outages severely affecting availability and service quality. These findings underscore the urgent need for infrastructure upgrades, improved maintenance, and stricter adherence to reliability standards to enhance power delivery to consumers in the area.