Reliability indicators of 110 kV electric networks, taking into account the seasonality of outage causes and an indirect indicator of the level of automation

Quantitative indicators of power supply reliability are necessary for calculating operational indicators that help identify bottlenecks in power supply systems, as well as for developing and justifying measures to improve power grids. A number of reliability indicators for 110 kV electric grids (number of outages, restoration time, total power restoration time, total interrupted capacity) are examined, broken down by outage cause. The seasonality of power grid failures by month of the year is analyzed. An indicator indirectly characterizing the level of automation and redundancy in electrical networks is proposed. It is the ratio of the total network equipment restoration time during failures to the consumer restoration time during outages caused by the same failures. For 110 kV networks, this indicator was 17 relative units, for 35 kV networks – 4.2 relative units, for 10 kV networks – 1.58 relative units, and for 0.4 kV networks – 1.04 relative units, reflecting the different levels of automation and redundancy in these networks.