An Evaluation of Reliability Indices of Selected Nigerian Power Distribution Systems

Abstract

A system reliability index deals with the quality of overall power supply and indicates the system character during disturbance. The performance of these indices revealed system interruption in terms of the individual customer or organization that’s purchases electric energy at one location under schedule. However, maintaining these reliability indices for electricity operator is very important. Thus, measurement of system reliability indices gives response to operation personnel on reliability effects of operating and maintenance practices. This study therefore, employed the Systems Average Interruptions Duration Index (SAIDI), Systems Average Interruptions Frequency Index (SAIFI) and Customer Average Interruptions Duration Index (CAIDI) for assessment of reliability indices of selected Nigerian power distribution network. Power outage data of Ten (10) were obtained from Ibadan, Ikeja and Port-Harcourt distribution network and analyzed using curve fitting tools in MATLAB. The reliability indices were computed and their means and standard deviations were calculated. The results showed that the reliability indices were effective for reliability assessment of electrical distribution network. Keywords: Reliability Indices, SAIDI, SAIFI, CAIDI, Distribution Network, Means and Standard Deviations. DOI: 10.7176/CEIS/12-3-03 Publication date: November 30 th 2021