Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

G. P. Kornilov, Dr. Eng., Prof., Dept. of Industrial Power Supply, e-mail: korn_mgn@mail.ru
A. A. Nikolaev, Cand. Eng., Associate Prof., Head of the Dept. of Automated Electric Drive and Mechatronics, e-mail: alexniko@inbox.ru
S. A. Tugulbaev, Postgraduate Student, Dept. of Industrial Power Supply, e-mail: trebie@yandex.ru
A. A. Bochkarev, Assistant, Dept. of Industrial Power Supply, e-mail: analogsynth@mail.ru
A. N. Emelyushin, Dr. Eng., Prof., Dept. of Foundry Processes and Materials Science, e-mail: emelushin@magtu.ru

The article considers the influence of the composition and condition of the main electrical equipment of the electric arc furnace (EAF) on its productivity and trouble-free operation time. Ensuring the specified productivity and minimal losses of working time in the melting cycle are, of course, the main factors in achieving the specified production efficiency of the entire unit as a whole. A direct relationship is shown between the voltage, the stability of which is ensured by the static var compensator (SVC), and the electric power introduced into the furnace. Electric energy in the overall heat balance is on average not less than 70-85 % depending on the composition of the charge and significantly affects the duration of the melt. Operation of the furnace without SVC or in its incomplete composition accordingly significantly reduces the capacity and productivity of the furnace. To ensure trouble-free and uninterrupted operation, it is necessary to identify weak points and links in the technological chain of operations, as well as in the electrical equipment involved in these operations. The article presents statistics of failures of the main elements of the power supply system of the electric power plant for a long period of time - 15 years; special attention is paid to damage to cable lines. A discrepancy between the nominal and actual values of the voltage of cable joints is noted. Losses of two categories are calculated and presented: firstly, from interruptions in power supply as a result of damage to cable lines in various variants of joint operation of the electric power plant and the SVC, and secondly, the most significant direct losses of the electric power plant productivity in the absence or incomplete composition of the compensating device.
The study was supported by the grant of the Russian Science Foundation No. 24-19-20026.

1. Kornilov G. P., Abdulveleev I. R., Gazizova O. V., Koptsev L. A. Features of power supply of integrated iron-and-steel works and possible prospects for its development. Metallurg. 2021. No. 7. pp. 81–89.
2. Nikolaev A. A., Anokhin V. V. Analysis of the electric power quality during stabilization of the EAF`s active power using a static thyristor compensator. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Seriya “Energetika“. 2019. Vol. 19. No. 3. pp. 51–64.
3. GOST 32144–2013. Electrical energy. Electromagnetic compatibility of technical equipment. Power quality limits in the public power supply systems. Introduced: 01.07.2014.
4. Kornilov G. P., Abdulveleev I. R., Kovalenko A. Yu. Increasing the reliability of power supply of metallurgical units due to circuit solutions. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Seriya “Energetika“. 2019. No. 12. pp. 21–25.
5. Nikolaev A. A., Kornilov G. P., Tulupov P. G. Improving the efficiency of electric arc furnaces through improved control algorithms for electrical modes. Chernye Metally. 2020. No. 12. pp. 10–16.
6. Kornilov G. P., Nikolaev A. A., Shemetov A. N. Analysis of operating modes of a static thyristor compensator of EAF`s reactive power. Glavny energetik. 2011. No. 3. pp. 30–34.
7. Lvova E. L., Mironova A. N. Experimental studies of the influence of a group of arc furnaces on the supply voltage. Vestnik Chuvashskogo universiteta. 2018. No. 3. pp. 67–78.
8. Glukhov A. V., Mekhryakov D. V., Voronov G. V. et al. Energy saving in a modern EAF DSP-120. Stal. 2020. No. 5. pp. 21–23.
9. Girilovich V. Yu. Reconstruction of DSP-No.1 with the aim of increasing the furnace productivity in the conditions of OJSC “BMZ - management company of the BMK holding“. Lityo i metallurgiya. 2015. No. 2 (79). pp. 70–73.
10. Tristiu I., Eremia M., Bulac C., Toma L. Multi-criteria reconfiguration of distribution electrical networks for minimization of power losses and damage cost due to power supply interruption. 2007 IEEE Lausanne Power Tech, Lausanne. 2007. pp. 385–390. DOI: 10.1109/PCT.2007.4538348
11. Kruchinin A. M. Nonlinear properties of EAF`s voltage and current transfer coefficients. Elektrotekhnika. 2016. No. 3. pp. 44–50.
12. Karandaev A. S., Evdokimov S. A., Khramshin V. R., Lednov R. A. Diagnostic functions of the system for continuous monitoring of the technical condition of EAF`s transformers. Metallurg. 2014. No. 8. pp. 53–59.
13. Shishimirov M. V., Rabinovich V. L., Aleksandrov A. V. et al. Optimization of the energy-technological steelmaking conditions in modern medium-capacity electric arc furnaces. Russ. Metall. 2021. pp. 709–712. DOI: 10.1134/S0036029521060227
14. Wei G., Zhu R. Innovations of injection metallurgy in EAF steelmaking. Electric arc furnace steelmaking with submerged mixed injection. Singapore : Springer, 2024. DOI: 10.1007/978-981-99-4602-0_7
15. Lvov A., Priedite-Razgale I., Rozenkrons J., Kreslins V. Assessment of different power line types’ life-time costs in distribution network from reliability point of view. 2012 Electric Power Quality and Supply Reliability. 2012. pp. 1–8. DOI: 10.1109/PQ.2012.6256220
16. Hernández J. D., Onofri L., Engell S. Chapter 4 - Integrated modeling and energetic optimization of the steelmaking process in electric arc furnaces. An industrial application. Simulation and Optimization in Process Engineering. Elsevier, 2022. pp. 77–100. DOI: 10.1016/B978-0-323-85043-8.00009-X
17. Liu Y., Wei G., Tian B. Analysis and optimisation on the energy consumption of electric arc furnace steelmaking. Ironmaking & Steelmaking. 2023. Vol. 50, Iss. 8. pp. 999–1013. DOI: 10.1080/03019233.2023.2172826
18. Olczykowski Z. Arc voltage distortion as a source of higher harmonics generated by electric arc furnaces. Energies. 2022. Vol. 15. 3628. DOI: 10.3390/en15103628
19. Makarov A. N. Calculation and analysis of energy parameters of melts in EAFs of conventional and Consteel design. Metallurg. 2018. No. 10. pp. 13–15.
20. Rules for the technical operation of electrical installations of consumers. Order of the Ministry of Energy dated August 12, 2022. No. 811. Available at: https://normativ.kontur.ru/document?moduleId=1&documentId=433499 (accessed: 17.09.2024).
21. Bortnik I. M., Buryak S. F., Olshvang M. V., Taratuta I. P. Static thyristor compensators for power systems and power supply networks. Elektrichestvo. 1985. No. 2. pp. 13–19.
22. Korovina A. I., Nechaev O. P., Taratuta I. P. Calculation of effects on the elements of a static thyristor compensator in the mode of switching on an electric furnace transformer in idle mode. Elektrotekhnika. 1989. No. 7. pp. 32–35.
23. Kochkin V. I., Nechaev O. P. Application of static reactive power compensators in electrical networks of power systems and enterprises. Moscow : Izdatelstvo ENAS, 2002. 248 p.
24. Yuldasheva A. I., Malafeev A. V. Taking into account reliability indicators when planning the mode of an industrial power supply system with its own power plants. Elektrotekhnicheskie sistemy i kompleksy. 2015. No. 3(28). pp. 36–40.
25. Sharygin M. V. Development of an universal model for assessing the consequences of power supply failures to consumers. Elektrichestvo. 2015. No. 3. pp. 4–12.
26. Barybin Yu. G. Handbook of power supply design. Moscow : Energoatomizdat, 1990. 576 p.