The influence of the equipment layout of the in-shop power supply circuits on their reliability parameters

RELEVANCE of the research consists in estimation of the reliability parameters of in-house power supply systems for enterprises with transformer substations with a voltage of 10/0.4 kV. The proposed study analyzes reliability indicators for in-house power supply circuits with various types of redundancy: without redundancy; with low-voltage redundancy (installation of 0.4 kV circuit breakers), with medium-voltage redundancy (with installation of disconnectors and a circuit breaker), without redundancy on the low side; as well as with double redundancy, which additionally provides for the installation of disconnectors and a circuit breaker, as well as circuit breakers for 0.4 kV. METHODS. The research uses the fundamentals of reliability theory, probability theory, and statistical data processing. Based on the calculation results and the information obtained, graphical dependences of the uptime of in–shop power supply systems with dual transformer substations are constructed, depending on the nominal capacity of the shop transformers for four circuit options: without redundancy; with redundancy for LV; with redundancy for MV; with double redundancy – for MV and LV. The condition for the rationality of the construction of the power supply scheme is the smallest number of transformer substations, and, accordingly, distribution transformers, with the accepted value of the load factor equal to 0.8. When comparing the results obtained, it was found that the longest operating time for failure, equal to 25.6 years, is achieved with double redundancy, the smallest – equal to 5.4 years – in the absence of redundancy. The reliability parameters of the system are being investigated, namely, the failure rate parameter and the operating time for circuit failure when the number of two-transformer substations (N_tp) changes from 1 to 5, as well as with different capacities of 10/0.4 kV workshop transformers (from 25 to 2,500 kVA). RESULTS. The results obtained show that the value of the operating time for failure is T for the scheme without redundancy is 4.38 and 4.29 times lower compared to the scheme with redundancy for MV and LV, respectively, and 4.72 times lower for the scheme with double redundancy. CONCLUSIONS. The conducted studies show that it is rational to use the minimum number of transformer substations N_tp, equal to 1 (in the absence of redundancy) or 2, since with N_tp = 3-5 the operating time for failure is minimal and is approximately 1.01 years with a load factor of transformers equal to 0.8. As a result of the research, it was found that the maximum operating time A failure time of 6.4 years was obtained for the scheme with double redundancy, and a minimum time of 1.01 years was obtained in the absence of backup elements.

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