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  4. Assessment of Ferroresonance Processes in Schemes of 6-35 kV Electrical Grids on the Basis of Reliability Analysis

Assessment of Ferroresonance Processes in Schemes of 6-35 kV Electrical Grids on the Basis of Reliability Analysis

JEECS.
2020;
Volume 6, Number 7
: pp. 137 – 145
https://doi.org/10.23939/jeecs2020.02.137
Received: October 01, 2020
Revised: November 06, 2020
Accepted: November 13, 2020

Z. Bakhor, A. Yatseiko, R. Ferensovych. Assessment of ferroresonance processes in schemes of 6-35 kV electrical grids on the basis of reliability analysis. Energy Engineering and Control Systems, 2020, Vol. 6, No. 2, pp. 137 – 145. https://doi.org/10.23939/jeecs2020.02.137

Authors:
  1. Zinoviy Bakhor
  2. Andriy Yatseiko
  3. Roman Ferensovych
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University
3
Lviv Polytechnic National University

The object of research is the choice of the optimal technical solution to prevent the development or the long existence of ferroresonance processes in electrical distribution grids of 6-35 kV, which are operated in isolated neutral mode. A lot of factors such as the grounding mode of a grid neutral, its capacitive current of a short circuit to the ground, the type and number of voltage transformers (VT) etc. influence on the probability of occurrence and duration of ferroresonance processes. According to the results of the research, the values of capacitive currents of a short circuit to the ground at which stable ferroresonance processes occur in electrical distribution grids of 6-35 kV are determined. The values of capacitive earth fault currents of a grid are decisive for the occurrence of a stable ferroresonance, but the nature of its flow is also influenced by additional accidental factors, such as: a grid voltage, an insulation status of power lines, a load of the secondary winding of voltage transformer etc. Therefore, a model for assessment the frequency of occurrence of a stable ferroresonance process in the electrical grid based on the analysis of the reliability of physical objects in the conditions of external actions was developed. In addition, an algorithm for determining the most dangerous scheme configurations of electrical grids concerning to a VT damage by the frequency of occurrence of a stable ferroresonance process in them and the choice of optimal solutions to prevent the VT damage were proposed.

electrical grid
ferroresonance
voltage transformer
isolated neutral
reliability analysis
  1. A. V. Zhurakhivskyi, Z. M. Bakhor, O. I. Hanus, P. P. Hovorov, A. Ya. Yatseiko, “Ferroresonance processes and protection of voltage transformers in the electrical grids of 6-35 kV: monograph”, Lviv Polytechnic Publishing House, Lviv, 2019, 324 p. (in Ukrainian)
  2. A. V. Zhurakhivskyi, Yu. A. Kens, A. Ya. Yatseiko, R. Ya. Masliak, “Ferroresonance processes in 10 kV power grids with different types of voltage transformers”, Technical Electrodynamics, No. 2, 2010, pp. 73-77. (in Ukrainian)
  3. A. V. Zhurakhivskyi, A. Ya. Yatseiko, R. Ya. Masliak, “Operation modes of voltage transformers in the electrical grids with isolated neutral”, Elektroinform, No. 1, 2009, pp. 8-11. (in Ukrainian)
  4. A. V. Zhurakhivskyi, Yu. A. Kens, A. Ya. Yatseiko, R. Ya. Masliak, “Protection of 6-35 kV electrical grids from ferroresonance processes”, Technical Electrodynamics, No. 5, 2013, pp. 70-76. (in Ukrainian)
  5. Ju. L. Saenko, A. S. Popov, “Investigation of the causes of damage of voltage transformers for insulation monitoring”, Power saving. Power engineering. Energy audit, Kharkiv, No. 7(89), 2011, pp. 59-66. (in Russian)
  6. A. V. Zhurakhivskyi, A. Ya. Yatseiko, R. Ya. Masliak, “Ferroresonance processes at the network frequency and ranges of attenuating resistors for its failure”, Bulletin of the Lviv Polytechnic National University: Electric power and electromechanical systems, No. 834, 2015, pp. 20-25. (in Ukrainian)
  7. A. I. Ganus, K. A. Starkov, “Damageability of voltage transformers in regional electrical grids of AK “Kharkovoblenergo” and measures to reduce it”, Light technics and electrical power engineering, Kharkiv, No. 1, 2003, pp. 76-81. (in Russian)
  8. A. I. Ganus, K. A. Starkov, “Influence of conditions of transient processes in electrical grids of 6-10 kV on the nature of damage of voltage transformers”, Power engineering and electrification, No. 2, 2006, pp. 5-11. (in Russian)
  9. Z. Emin, B. Zahavi, D. Auckland, Y. Tong, “Ferroresonance in electromagnetic voltage transformers: a study based on nonlinear dynamics”, IEEE Proc. on Generation, Transmission, Distribution, Vol. 144, 1997, pp. 383-387. https://doi.org/10.1049/ip-gtd:19971061
  10. “Rules of arrangement of electrical installations. Official publication. Ministry of Energy of Ukraine”, Publishing House “Fort”, Kharkiv, 2017, 760 p. (in Ukrainian)
  11. A. V. Zhurakhivskyi, Yu. A. Kens, R. V. Medynskyi, N. R. Zasidkovych, “Installation and testing of non-resonant voltage transformer of 6-10 kV”, Power engineering and electrification, No. 8, 2001, pp. 17-22. (in Ukrainian)
  12. A. V. Zhurakhivskyi, B. M. Kinash, A. Ya. Yatseiko, R. Ya. Masliak, “Reliability analysis of the operation of voltage transformers in the conditions of ferroresonant actions”, Technical Electrodynamics, No. 5, 2010, pp. 47-51. (in Ukrainian)
  13. T. Van Craenenbroeck (2003) Discussion of Modeling and Analysis Guidelines for Slow Transients. III. The Study of Ferroresonance. IEEE Transactions on Power Delivery, 18(4), 1592. https://doi.org/10.1109/TPWRD.2003.810943
  14. Arroyo, A., Martinez, R., Manana, M., Pigazo, A., Minguez, R. (2019) Detection of Ferroresonance Occurrence in Inductive Voltage Transformers through Vibration Analysis. International Journal of Electrical Power & Energy Systems, 106, 294-300. https://doi.org/10.1016/j.ijepes.2018.10.011
  15. Enrique, R., Pineda, P., Rodrigues, R., Aguila Tellez, A. (2018) Analysis and Simulation of Ferroresonance in Power Transformers using Simulink. IEEE Latin America Transactions, 16(2), 460-466. https://doi.org/10.1109/TLA.2018.8327400
  16. Abdelazim, T., Dionise, T. J., Yanniello, R. (2016) A Case Study of Voltage Transformer Failures in a Modern Data Center: Analysis, Mitigation, and Solution Implementation. IEEE/IAS 52nd Industrial and Commercial Power Systems Technical Conference (I&CPS), 1-11. https://doi.org/10.1109/ICPS.2016.7490257
  17. Abdelazim, T., Dionise, T. J., Yanniello, R. (2016) Protecting Voltage Transformers from Switching Induced Transients and Ferroresonance. 2016 IEEE-IAS/PCA Cement Industry Technical Conference, Dallas, TX, 1-17. https://doi.org/10.1109/CITCON.2016.7742671