Causes and consequences of emergency shutdowns in rural power grids of 0.4 kV

The causes of emergency outages in rural power grids and their consequences must be considered when predicting probable damage from outages and selecting measures to improve the reliability of power supply to rural consumers. The study aimed to identify numerical indicators of both the frequency and the consequences of emergency outages in 0.4 kV rural power grids. Based on the analysis of statistical data on the number of emergency outages and their causes in 0.4 kV power grids of the Orel region, the authors calculated the following parameters: restoration time, power supply restoration time, interrupted power, and the number of de-energized connection points. The most frequent causes of outages were identified as damage in consumer networks (53%), blown fuses and unidentified causes (9-11% each), and wire clashing (6-7%). However, the significance of each cause varies depending on whether one considers the number of outages, the duration of power supply interruptions, restoration time, or interrupted power. Interrupted power and the number of de-energized points are directly related to the number of outages. Based on the calculated quantitative data, the following measures are recommended to improve the reliability of power supply to 0.4 kV rural power grids: improving the configuration of power grids; sectionalizing power lines; equipping power grids with means for monitoring operating mode parameters; replacing bare wires with insulated ones. This study addresses the problem of identifying the number and consequences of emergency outages in 0.4 kV rural power grids as part of analyzing the operational efficiency of power supply systems for rural consumers.

1. Sbitnev E.A., Zhuzhin M.S. Accident rate analysis of rural electric networks 0.38 kV of the Nizhny Novgorod power system. Vestnik NGIEI. 2020;11:36-47. (In Russ.)

2. Vasilyeva T.N., Lopatin E.I. The analysis of causes of failures of the electric equipment of distributive networks 0,38 … 10 kV. Bulletin of the Ryazan State Agrotechnological University named after P.A. Kostychev. 2011;3:64-66. (In Russ.)

3. Izvekov E.A., Kartavtsev V.V. Evaluation of reliability improvement of electric power supply to a consumer reserved with the help of an energy storage system. Vestnik of Voronezh State Agrarian University. 2022;15(2):53-63. (In Russ.)

4. Naumov I.V. A prospective assessment of the functioning electric networks reliability using the example of the PJSC Rossetti Volga – Saratov distribution networks branch. Journal of Siberian Federal University. Engineering and Technologies. 2024;17(3):360-377. (In Russ.)

5. Naumov I.V., Polkovskaya M.N. Analytical assessment of the functioning of distribution electric networks of PJSC Rosseti Volga – Orenburgenergo. Journal of Siberian Federal University. Engineering and Technologies. 2024;17(8):988-1006. (In Russ.)

6. Vinogradov A.V., Seyfullin A.Yu., Bukreev A.V. Determining the optimal location for multi-contact switching systems. Agricultural Machinery and Technologies. 2024;18(3):82-90. (In Russ.) https://doi.org/10.22314/2073-7599-2024-18-3-82-90

7. Vinogradova A.V., Vinogradov A.V., Bukreev A.V. Study of specific reliability indicators of 0.4 kV power networks. Agricultural Engineering (Moscow). 2024;26(6):77-85. (In Russ.) https://doi.org/10.26897/2687-1149-2024-6-77-85

8. Breido I., Kaverin V., Ivanov V. Telemetric Monitoring Insulation Condition of High Voltage Overhead Power Lines. Proceedings of the 29th DAAAM International Symposium, 2018. Рр. 0319-0328. https://doi.org/10.2507/29th.daaam.proceedings.046

9. Chatterjee S., Roy B. Prediction of line contingency catastrophic failures using synchrophasor measurements. Journal of Control Automation and Electrical Systems. 2019;30(6):1107-1115. https://doi.org/10.1007/s40313-019-00501-x

10. Böhm R., Rehtanz Ch., Franke J. Strategy for implementing black start and islanded operation capabilities on distribution system level. Energy Systems Research. 2018;1(1):9-20. https://doi.org/10.25729/esr.2018.01.0001