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.

1. Ovsyannikov AG. MRO strategies and equipment diagnostics. Electrical Engineering News. 2008;(2):140-142. (In Russ.).

2. Sekretarev YA, Levin VM. Selection and decision-making on managing repairs of power equipment in power supply systems with monoconsumer. Newsletter of North-Caucasus Federal University. 2021;(2):17-25. (In Russ.) doi: 10.37493/2307-907X.2021.2.2

3. Sekretarev YA, Levin VM. Risk-based models of equipment repair management in power supply systems with a mono consumer, J. Sib. Fed. Univ. Eng. & Technol. 2021;14(1):17-32. (In Russ.) doi: 10.17516/1999-494X-0295

4. Levin VM, Sekretarev YA. Evaluation of the effect on the reliability of the electrical supply system of a different kind of defects of its basic elements. Kazan state power engineering university bulletin. 2019;4(44):55-63 (In Russ.)

5. Sekretarev YA, Gorshunov AA, Menyakin DA. Modeling of the technical condition of an equipment of power supply systems of mono consumers taking into account circuit reliability. Vesti higher educational institutions of the Chernozem region. 2022;3(69):3-14. (In Russ.)

6. Kitushin VG. Reliability of energy systems. Part 1. Theoretical foundations : a textbook. Novosibirsk: NSTU; 2001. 256 p. (In Russ.)

7. Nepomnyashchij VA. Economic losses from power supply disruptions to consumers. Moscow: MEI Publishing House; 2016. 188 p. (In Russ.)

8. Kitushin VG. Damage caused by power outages and its assessment. Design and operation of energy systems and electrical networks. Moscow: Energosetproekt; 1979;(16):18-25. (In Russ.)

9. Guk YB. Reliability theory in the electric power industry. Leningrad: Energoatomizdat; 1990. 208 p. (In Russ.)

10. Rozanov MN. Reliability of electric power systems. Moscow: Energiya; 1974. 176 p. (In Russ.).

11. Sekretarev YA. Reliability of power supply. Novosibirsk: NSTU; 2010. 104 p. (In Russ.)

12. Karavaev AA, Sekretarev YA. Monitoring and management of recovery processes at the plant. Novosibirsk: Collection of scientific papers of Novosibirsk State Technical University; 2001;2:77-82.

13. Karavaev AA, Moshkin BN, Sekretarev YA. Models of monitoring and management of repair and restoration processes at the plant. Bulletin of the Khakass State University. 2000;6:54-56.