DESTRUCTIVE EFFECT OF GEOMAGNETIC ALLY INDUCED CURRENTS ON POWER TRANSFORMERS AND AUTOTRANSFORMERS OF ELECTRIC POWER SYSTEMS

Ilhomjon Qodirov

Authors

 

Vakhnina V.V. – Doctor of Technical Sciences, Professor, Head of the Department of Power Supply and Electrical Engineering, Togliatti State University, Tolyatti, Russia, vvvahnina@yandex.ru

Kuvshinov A.A. – Doctor of Technical Sciences, Professor of the Department of Power supply  and electrical engineering, Togliatti State University, Tolyatti, Russia, vvvahnina@yandex.ru

Bychkov A.V. – Assistant of the Department of Power Supply and Electrical Engineering,Togliatti State University”, Tolyatti, Russia, vvvahnina@yandex.ru

Fedyay O.V. – Assistant of the Department of Power Supply and Electrical Engineering,Togliatti State University”, Tolyatti, Russia, vvvahnina@yandex.ru

Eremin R.N. – postgraduate student of the Department of Power Supply and Electrical Engineering, Togliatti State University”, Tolyatti, Russia, vvvahnina@yandex.ru

 

 

Annotation

 

 The paper studies the destructive impact of geo-induced currents on power transformers and autotransformers with core, armored core and armored magnetic core structure. The unpredictability of the impact of quasipermanent currents in the operation of transformer equipment of electric power system is revealed. To analyze the destructive effects of GIС on power transformers and autotransformers with different structural system of the magnetic core, computer simulation of alternating and quasipermanent magnetic fields in the software product FEMM. It was shown that for power transformers and autotransformers with armored and armored core magnetic system designs, geoinduced currents commensurate with no-load current can shift the magnetization mode to the region of technical saturation. The simulation results are presented in the form of a table. It has been found that for power transformers with core structure of magnetic system only GIC, exceeding several times the nominal phase current of high voltage winding, can shift the remagnetization mode to the region of technical saturation for power transformers and autotransformers with armored core and armored structure of magnetic system GIC, commensurate with no-load current, are already able to shift the remagnetization mode to the region of technical saturation. The possibility of tripping or damage of power transformers and autotransformers becomes real, which can lead to the development of system accidents in electric power systems.

 

Keywords

 

electric power system, power transformer, flux linkage, geomagnetically induced current

 

References

 

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Publication date

2023-10-27