The reliability of 33kV distribution networks is crucial to the stability of Nigeria\\\'s electricity supply. Serving as the interface between the transmission grid and 11kV feeders, these networks directly affect service delivery, customer satisfaction, and operational efficiency. This paper examines the operational challenges and reliability issues of the 33kV feeders within the Port Harcourt Electricity Distribution Company (PHEDC) network, with a focus on performance assessment using standard indices such as SAIDI, SAIFI, and CAIDI. Preventive maintenance, feeder automation, and improved operational practices are identified as key measures for enhancing reliability. Results reveal major network challenges such as overloaded feeders, poor voltage profiles, high technical losses, and frequent interruptions. Reliability indices, including SAIFI, SAIDI, CAIDI, and ENS, were significantly above IEEE and NERC thresholds, indicating poor service continuity. To address these deficiencies, the study proposes targeted improvement strategies such as feeder reconfiguration, installation of automated reclosers and sectionalizers, preventive maintenance, and upgrading of aging conductors and transformers. The study concludes that targeted investment in maintenance, automation, and workforce training can significantly reduce outages and improve service continuity.
Amadi et al. (Wed,) studied this question.
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