Е-Публикации
Технически университет - София

Abstract: The proposed article is assessing the reliability parameters of power supply systems with 10/0.4 kV transformer substations. The paper examines the reliability of the power supply system for the following circuit options: without redundancy; with redundancy at medium and low voltages; with double redundancy: when reserving the entire MV-LV circuit. Graphical dependences of the operating time for failure of power supply circuits on the different rated power of transformers for four variants are obtained: without redundancy; with redundancy for LV; with redundancy for MV; with double redundancy of the entire MV-LV circuit. The optimal condition is found to use a smaller number of transformer substations, and, accordingly, distribution transformers, while observing the value of the 0.8 load factor. When comparing the graphs, it was found that the longest operating time to failure is achieved with double redundancy, the shortest with no redundancy. The payback period of the options is calculated considering the inflation index. According to the calculation results, it is found that the variant of redundancy for LV is optimal, with the shortest payback period of 5.77 years. Next, there is a no-redundancy scheme with a payback period of 5.86 years, but with a higher failure rate. The dual redundancy pays off in 5.92 years. The research results can be used in the designing of power supply systems, improving the reliability and efficiency of equipment operation.

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