Study of specific reliability indicators of 0.4 kV power networks

The reliability of power supply determines the operation of power networks. The literature review 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 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 km were examined. Based on the analysis, the authors identified the values of specific reliability indicators and trends in their changes over 6 years and analyzed probable reasons for these changes. It was revealed that the values of the failure flow parameter do not exceed the reference values until 2022 inclusive, and in 2023, they exceed the reference values in 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 kilometers of 0.4 kV lines in 2023 was 29 year-1, and intentional – 71 year^-1. The values of specific disconnected power per outage decreased in 17.5 times in 2023 as compared to 2018, the average value per outage is 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 MWh/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.

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