Model of corrective effects of maintenance and repairs on the restoration process in power supply systems

Introduction. The paper proposes a model for evaluating the effectiveness of maintenance and repairs, based on calculations of the reliability of the power supply system (PSS) after restoration work (repairs), taking into account the mathematical expectation of damage from under-supply of electricity to consumers. Since damage is a local characteristic of the consequences of a failure (malfunction, accident), it is tied to a specific consumer or group of consumers, i. e. to a specific object. These facilities are either substations or large consumers. Goal. The study aims to verify the operability of the model, calculations were carried out to assess the impact on the reliability of the power supply. Materials and methods. In order to verify the operability of the proposed model, calculations were carried out to assess the impact on the reliability of the power supply of the Southern Branch of the Novosibirsk City electric grid. It includes two substations and three of the largest consumers. Results and discussion. Calculations of the reliability of the PSS were carried out before and after the repair and restoration work. Taking into account the allocated funds for repairs, the reliability level can be increased by 1% for selected consumers over various time periods. Conclusion. It was shown in figures that in PSS with worn-out equipment, restoring reliability requires both more frequent maintenance and increased repair costs. Since these results were obtained by calculation and have objective quantitative characteristics, the problem of dosages of corrective actions at various PSS facilities can be effectively solved.