Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.18799/24131830/2021/03/3115

Ключевые слова: reactive power, power factor, switching overvoltages, vacuum circuit breaker, individual phase compensation, chopping current, capacitor unit, power reducing transformer

Аннотация: The relevance of the research arises from the need to develop technical solutions to limit switching overvoltages that occur when switching power transformers and effective compensation of reactive power. The main aim of the research is to study the influ The relevance of the research arises from the need to develop technical solutions to limit switching overvoltages that occur when switching power transformers and effective compensation of reactive power. The main aim of the research is to study the influence of reactive power compensation on value of switching overvoltages when switching power transformers 6 (10)/0,4 kV and substantiation of the most effective means of protecting power transformers from switching overvoltages. Objects: transformers with a rated power of 250, 400, 630 and 1000 kVA; vacuum circuit-breaker; individual phase compensation devices. Methods. Instrumental-oscillographic, simulation of transient processes of phase voltages was performed in MultiSim. Results. The authors have analyzed the efficiency of existing protection equipment against switching overvoltages arising during switching of power transformers 6 (10)/0,4 kV. Computer simulation of influence of reactive power compensation on switching overvoltage value was performed. To confirm the simulation results, experimental studies were performed. The oscillograms of switching overvoltages that occur when a power transformer with rated power of 250 kVA is disconnected are shown. It was established that devices designed for reactive power compensation can be successfully used to suppress switching overvoltages when switching power transformers, provided that, these devices are connected to the low voltage winding of the transformer. In residential electric networks for effective compensation of reactive power it is proposed to use capacitor units with individual phase compensation and to place them on the input bus of municipal and residential buildings. For suppression of switching overvoltages in residential electric networks, it is necessary to introduce a capacitor unit with symmetrical unregulated compensation at transformer substations. © 2021 Tomsk Polytechnic University, Publishing House. All rights reserved.

Журнал: BULLETIN OF THE TOMSK POLYTECHNIC UNIVERSITY-GEO ASSETS ENGINEERING

Выпуск журнала: Vol. 332, Is. 3

Номера страниц: 197-209

ISSN журнала: 25001019

Место издания: TOMSK

Издатель: TOMSK POLYTECHNIC UNIV, PUBLISHING HOUSE

• Kuzmin Roman S. (Siberian Fed Univ, 3 Vuzovsky St, Krasnoyarsk 660025, Russia)
• Zavalov Artem A. (Siberian Fed Univ, 3 Vuzovsky St, Krasnoyarsk 660025, Russia)
• Mainagashev Roman A. (Siberian Fed Univ, 3 Vuzovsky St, Krasnoyarsk 660025, Russia)
• Menshikov Vitalii A. (Siberian Fed Univ, 3 Vuzovsky St, Krasnoyarsk 660025, Russia)
• Kuzmin Ilya S. (Res & Prod Enterprise Rutas LLC, 2Zh,2-09 Academician Vavilov St, Krasnoyarsk 660064, Russia)

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