Calculation of specific operating modes of relay protection for AC traction networks
https://doi.org/10.21780/2223-9731-2020-79-4-245-248
Abstract
Relay protection of traction networks against short-circuit currents in alternating current sections should have both selectivity and speed. However, in areas with an increased probability of burnout of contact wires during a short circuit, selectivity is often put away to increase the speed of response. Such operating modes of relay protection in the traction network are specific. The author considers one of these modes, namely, the operation of distance protections with an increased step area without time delay with a partially non-selective protection system, which ensures the fastest possible shutdown of damage within the entire protected area. At the same time, it is indicated that an increase in the coverage area of a step without a time delay to the size of the protected area can cause non-selective tripping of a number of switches in case of damage near substations or a sectioning post. Therefore, it is proposed to select the optimal value of the tunable zone of non-selective protection action, at which the probability of non-selective tripping of switches will be minimal. For this, the author presents an analytical solution to this problem, which allows automating calculations when forming proposals for setting up protection in a specific operating mode. It is noted that by choosing the sensitivity coefficient value in the formulas, it is possible to adjust the zone of non-selective action of distance protections so that its real value will approach the size of the protected area, while remaining strictly larger than it, which will eliminate the danger of burnout of contact wires in case of a short circuit and reduce the probability non-selective disconnection of switches on the site.
About the Author
K. S. Subkhanverdiev
Federal State Autonomous Educational Institution of Higher Education “Russian University of Transport” (FGAOU VO “RUT” (MIIT))
Russian Federation
Russian Federation
Kamil’ S. Subkhanverdiev - Cand. Sci. (Eng.), Senior Lecturer of the Department Electric power industry of transport.
Moscow, 127994References
1. Figurnov E. P., Zharkov Yu. I., Petrova T. E. Releynaya zashchita setey tyagovogo elektrosnabzheniya peremennogo toka. Ucheb. posobie dlya studentov vuzov zh.d. transporta [Relay protection of AC traction power supply networks. Reference book for students of higher educational institutions of railway transport]. Moscow, Marshrut Publ., 2006, 272 p.
2. Zharkov Yu. I., Zaytsev V. A., Kuznetsov V. V., Figurnov E. P. Ob osnovnykh svoystvakh perspektivnoy releynoy zashchity kontaktnoy seti peremennogo toka [On the main properties of perspec tive relay protection of the alternating current contact network]. Voprosy rascheta, tekhnicheskoy diagnostiki i avtomaticheskogo upravleniya sistem elektrosnabzheniya: mezhvuz. temat. sb. tr. [Questions of calculation, technical diagnostics and automatic control of power supply systems: interuniversity themed coll. of works]. Rostov n/D, RIIZhT Publ., 1981, no. 162, pp. 25–30.
3. German L. A., Zimakov V. A. Sovershenstvovanie rukovodyashchikh ukazaniy po releynoy zashchite tyagovogo elektrosnabzheniya peremennogo toka [Improving guidelines for relay protection of AC traction power supply]. Vestnik VNIIZhT [Vestnik of the Railway Research Institute], 2009, no. 5, pp. 25–28.
4. Pupynin V. N. Opredelenie zon deystviya zashchit fiderov 27,5 kV podstantsiy i postov sektsionirovaniya zheleznykh dorog peremennogo toka pri uzlovoy skheme pitaniya. Trudy MIIT [Determination of the coverage zones of 27.5 kV feeders of substations and sectioning stations of alternating current railways with a nodal power supply scheme. Works of the MIIT]. Moscow, Transport Publ., 1965, no. 199, pp. 184–195.
5. Subkhanverdiev K. S. Chastichnoneselektivnaya sistema zashchit kontaktnoy seti [Partially non-selective system of protection of the contact network]. Mir transporta [World of Transport and Transportation Journal], 2014, no. 5, pp. 90–96.
6. Subkhanverdiev K. S. Razrabotka i sovershenstvovanie algoritmov selektivnoy i neselektivnoy sistem zashchity tyagovykh setey peremennogo toka. Dis. ... kand. tekhn. nauk [Development and improvement of algorithms for selective and non-selective protection systems for AC traction networks. Cand. tech. sci. diss.]. Moscow, 2018, 173 p.
7. Guidelines for relay protection of traction power supply systems. JSC “Russian Railways”, Department of Electrification and Power Supply. Moscow, TRANSIZDAT Publ., 2005, 216 p. (in Russ.).
8. STO RZD 07.021.4–2015. Protection of railway power supply systems from short circuits and overload. Part 4. Methodology for choosing protection settings in the AC traction power supply system. Moscow, 2016, 136 p. (in Russ.).
Review
For citations:
Subkhanverdiev K.S. Calculation of specific operating modes of relay protection for AC traction networks. RUSSIAN RAILWAY SCIENCE JOURNAL. 2020;79(4):245-248. (In Russ.) https://doi.org/10.21780/2223-9731-2020-79-4-245-248
Views:
650
.jpg)
Email this article 