Distribution network planners carry out analyses of the power distribution network that may include studies like faults, sensitivity analysis and reliability assessment to enhance the robustness of the network. System reliability is the ability of the power system to provide an adequate supply of electrical power at a desired time without interruption. This paper focuses on reliability assessment of distribution network. It involves the determination of the reliability indices which explain the dependability of the system. Fifteen 11kV feeders are considered and the required data of the feeders to be used in this study were sourced from the chosen power utility company in Nigeria. A power system software called ETAP was used in computational process. The reliability indices of the chosen network were computed, and the results obtained are presented. From the results, the performance of these Fifteen 11kV feeders are classified into three; Best, averagely and poorly performing feeders, and they are highlighted using tables and charts. The results are discussed and analyzed. The findings from the study indicate that some feeders have very good reliability indices while some are having average values and others are with poor reliability indices. The most critical feeders that need improvement were identified.
Power transformers constitute the most costly equipment which often posed constraints to electric power utility companies' management. These transformers develop faults often due to oil insulation problems resulting from poor level of insulation oil, lack of routine maintenance, contamination, age, carbonization arising from system tripping as well as degradation of paper insulation due to ageing. However, the most economical way of maintaining stability in power supply to customers is creating a routine program of transformer oil regeneration for power transformer in the network. This paper therefore presents the optimization process of transformer oil regeneration for electric power utility company equipment. In this study, combined techniques of hot oil circulation, oil purification and oil reclamation of transformer oil regeneration was used for analysis of two 15MVA, 33/11kV power transformer. The process is aimed at drying the solid insulation of the transformer through the circulation of hot oil. The results of the transformer oil test before and after carrying out oil regeneration processes for the two 15MVA transformers are obtained and presented. For each transformer, the results are in five categories of properties namely; Physical, Electrical, Chemical, Dissolved metals and Dissolved gas analysis properties. The results indicated that the viscosity of transformer 1 is better than that of transformer 2. In addition, the dielectric breakdown voltage of oil transformer 1 is of more quality than the oil in transformer 2. The results are in agreement with standard ASTMD, IEC and ISO because the transformer properties has individual standard with each having its own mark. The comparison shows that transformer oil regenerated was very close to reality because the oil in the two power transformers is close to 90 %.
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