The reliability of power supply determines the operation of power networks. The literature reviews have revealed that insufficient attention is paid to the research of specific reliability indices necessary for planning and evaluation of energy saving efficiency. Therefore, the purpose of the work is to study the specific reliability indicators of 0.4 kV power networks. Among the analyzed indicators, we consider the flow of failures, the flow of intentional outages, specific values of disconnected power and undersupply of electricity, and others. The authors have analyzed statistical data on emergency and planned outages of 0.4 kV power networks in the Orel region over the period 2018–2023. In total, 12 787 overhead power lines with a total length of more than 10 thousand kilometers have been examined. Based on the analysis, the authors identify the values of specific reliability indicators and trends in their changes over 6 years and analyze probable reasons for these changes. It has been revealed that the values of the failure flow parameters do not exceed the reference values until 2022 inclusive, and in 2023, they exceed the reference values by 1.2 times. In 2022–2023, there was a significant increase in the number of both emergency and intentional (planned) outages; the flow of failures per 100 km of 0.4 kV lines in 2023 was 29 per year, and intentional outages constituted 71 per year. The values of specific disconnected power per outage decreased by 17.5 times in 2023 as compared to 2018, the average value per outage was 0.0009 MW. The specific value of undersupply of electricity per consumer per year is in the range between 1 and 5.7 MWh/consumer for emergency shutdowns, and 3 to 8.1 MW h/consumption, according to the new plan. Specific reliability indices allow assessing the efficiency of 0.4 kV distribution networks in a particular region and can be used in assessing the effect of implementing measures to improve the reliability of power supply.
Vinogradova et al. (Thu,) studied this question.
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