Improving the reliability of transformer substations 10/0.4 kV by replacing one transformer with two

The load of both industrial and household rural consumers is, as a rule, seasonal. Therefore, during the year, power transformers of transformer substations 10/0.4 kV are loaded irrationally, which leads to an increase in specific no-load losses in them. A method is proposed to reduce electricity losses by replacing one transformer at a transformer substation with two, ensuring seasonal operation of each of the installed transformers, and their joint operation during seasons with the highest load. It also provides for backup switching to the second transformer in case of failure of the first one. The impact of the proposed method on the reliability of power supply to consumers has been assessed. It is shown that the replacement of one transformer by two at a transformer substation fed by a single 10 kV line makes it possible to increase the reliability of power supply to consumers. The calculation shows that the reduction in the time of interruptions in the power supply of consumers connected to the substation and associated with failures of its equipment, after the implementation of the proposed method, is reduced from 9.44 to 0.613 h/year.