Assessment of reliability of an overhead transmission line with a split back-up phase

Transmission of electrical energy is the most important component of an electric power system. Optimization, modernization of the electric power transport system, increasing the capacity, as well as variability of connection arrangements, while maintaining the required level of reliability and safety, is regarded today as an urgent task for the energy industry as a whole. The article is devoted to the problem of determining the efficiency of the circuit design solution for a double-circuit three-phase power transmission line with an additional mode of operation — «with a split back-up phase» and determining its main reliability indicators. A circuit design solution for a double-circuit power transmission line with expansion of operating modes is presented in detail. The functional redundancy of the transmission line in accordance with the circuit design solution is based on switching of a conventional double-circuit power transmission line in the emergency mode to the single-circuit split-phase mode, which is the second working circuit. The ways of increasing the natural power of a double-circuit power transmission line are considered. The results of calculation of the capacity of a line with a split back-up phase and a comparison of the main parameters of overhead transmission lines with an additional mode of operation — with a split back-up phase — and power lines in conventional modes of operation, are presented. The results of calculations of reliability indicators are presented, such as the probable relative number of hours of interruption of power supply and the undersupply of electrical energy. A comparison of options have shown that the probable relative under-supply of the electric power of a double-circuit overhead transmission line with an additional operating mode — with a split back-up phase, is lower by approximately 13% than that of a conventional double-circuit power line, which will positively affect the maneuverability and reliability of the entire system.

1. Barbashov I. V., Vinogradov A. A., Fedotova E. K. Electrical networks of electrical power systems. Belgorod: Izd-vo Belgorodskogo GTU 2016. (In Russ.)

2. Idel'chik V. I. Electric systems and networks. Moskva: Al'yans 2009. (In Russ.)

3. Kopeikina T. V. Technical aspects of application of the compact operated electricity transmission air-lines. International journal of applied and fundamental research 2015; 12(4): 581–584. (In Russ.)

4. Zarudskii G. K., Samalyuk Y. S. About regime features of compact air-lines of an electricity transmission of 220 kV. Electricity 2013; (5): 8–13. (In Russ.)

5. Kareva S. N. Application in ENES of the compact operated electricity transmission air-lines. Energiya edinoi seti 2013; 4(9): 60–68. (In Russ.)

6. Stepanov V. M., Karniczkij V. Yu. Compact power lines. Tula: Izvestiya Tul`skogo gosudarstvennogo universiteta 2010; (3–5): 49–51.

7. Horowitz S. H., Phadke A. G., Renz B. A. The Future of Power Transmission. IEEE Power and Energy Magazine 2010; 8(2): 34–40. (In Eng.)

8. Vo Х. K., Kostochkin A. A. The advantages of using power lines with a backup phase. Tomsk: VN-TK Energetika: effektivnost', nadezhnost', bezopasnost' 2013; (1): 385–388.

9. Nesterov A. S., Lebedev M. P., Kobylin V. P., Vasil'ev P. F., Davydov G. I., Khoyutanov A. M. Increase in efficiency of operation of air-lines of an electricity transmission with a reserve phase. South Ural State University bulletin. Series «Power engineering» 2016; (4): 45–48. (In Russ.)

10. Nesterov A. S., Lebedev M. P., Kobylin V. P., Vasil'ev P. F. Device of reservation of a power line The patent 2014151341/07 Russian Federation. Bulletin of inventions 2016. (In Russ.)

11. Faibisovich D. L. Reference book on design of electrical networks. 3-e izd., pererab. i dop. Moskva: Izd-vo NTs ENAS 2009. (In Russ.)