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Petrova R. M., Gracheva E. I., Miftakhova N. K.
Assessment of reliability parameters of power supply systems' schemes of industrial facilities of electrical complexes when changing the load power and area of the facility while performing technical and economic calculations
DOI: 10.21443/1560-9278-2025-28-4/1-490-508
Abstract. The relevance of the study lies in the assessment of the reliability parameters and economic efficiency of intra-shop power supply systems of enterprises with 10/0.4 kV transformer substations. The study analyzes the reliability indicators for intra-shop power supply circuits with different types of redundancy: without redundancy; with redundancy at low voltage (LV); with redundancy at medium voltage (MV), without redundancy at LV; and with double redundancy. The reliability parameters of the system are studied, namely the failure rate parameter and the mean time between failures of the circuit when the number of distribution transformers (Ndtr) changes from 1 to 5, with different rated capacities of 10/0.4 kV shop transformers (from 25 to 2,500 kVA), as well as when the load power and the area of the enterprise change. The obtained results show that the mean time between failures T for the circuit without redundancy is 2.03 and 2.04 times less compared to the circuit with redundancy on the MV and LV, respectively, and 2.09 times less for the circuit with double redundancy. The conducted studies show that it is rational to use the minimum number of distribution transformers Ntr, equal to 1 (in the absence of redundancy) or 2, since at Ndtr = 3–5 the mean time between failures T is minimal and equal to 0.97 years. The research has established that the maximum mean time between failures, equal to 6.01 years, is obtained for the circuit with double redundancy, and the minimum, equal to 0.97 years, is obtained in the absence of redundant elements in the circuit with 5 transformers. The discounted payback period of equipment for 4 scheme options has been calculated and it has been found that the shortest payback period (for a scheme without redundancy) is 7.75 years taking into account inflation equal to 8.6 % per year.
Printed reference: Petrova R. M., Gracheva E. I., Miftakhova N. K. Assessment of reliability parameters of power supply systems' schemes of industrial facilities of electrical complexes when changing the load power and area of the facility while performing technical and economic calculations // Vestnik of MSTU. 2025. V. 28, No 4. P. 490-508.
Electronic reference: Petrova R. M., Gracheva E. I., Miftakhova N. K. Assessment of reliability parameters of power supply systems' schemes of industrial facilities of electrical complexes when changing the load power and area of the facility while performing technical and economic calculations // Vestnik of MSTU. 2025. V. 28, No 4. P. 490-508. URL: https://vestnik.mauniver.ru/v28_4_1_n105/04_Petrova_490-508.pdf.
