Published Paper Details:

This research evaluated the system reliability metrics and performance indicators, quantify distribution feeder performance in terms of feeder downtime, availability, interruption rate, and overall system reliability. Monte Carlo Simulation was utilized to compare the reliability metrics before and after the implementation of automatic circuit reclosers to provide practical insights for CENPELCO, and to enhance system reliability through strategic placement of automatic circuit reclosers. The results have shown a notable reduction in the duration of sustained interruptions, leading to a corresponding increase in availability. This reduction in interruptions translates to improved feeder reliability which has a direct positive impact on the overall availability of the substation. The most significant outcome of the study is the substantial decrease in downtime, approximately 2,204.602 minutes, which can be attributed to the integration of Automatic Circuit Reclosers (ACRs). This device emerges as the preferred protective devices for swiftly re-energizing circuits after clearing transient faults, to minimize downtime. Moreover, the reliability forecast based on the results indicates that reliability has remained relatively constant resulting in the conversion of the saved SAIFI into MAIFI, which effectively constrains the overall number of interruptions. The study also substantiates that it is possible to maintain reliability while simultaneously increasing availability through the utilization of ACRs. This dual achievement not only enhances system performance but also contributes to increased customer satisfaction due to the reduction in downtime. Furthermore, this study provides validation for NEA's decision to exclude CAIDI and MAIFI from its reliability assessment mechanism. The observed pattern indicates that as SAIFI values are converted into MAIFI, there is a corresponding proportional reduction in SAIDI. Consequently, CAIDI, which measures restoration time, remains relatively constant. It is recommended to perform fault analysis and protection coordination before actual installation of ACRs considering actual ratings of all components of the feeders.