Scientific paper ID 1873 : 2019/3
ANALYSIS OF VOLTAGE TRANSFORMERS DURING THE RECONSTRUCTION OF A SUBSTATION 110/10 kV

Vasil Dimitrov, Gulek Nedjib

In recent years, there has been a significant increase in the workload of the existing ”Medium-voltage” distribution network in the region of Boyana substation, which necessitates its upgrading, including inspection of the measurement and protection circuits operating since the construction of the substation in 1973. The aim of the paper is to analyze the state of the existing voltage transformers and surge arresters in the energy object, as well as to assess the necessity of their replacement during the substation reconstruction. A methodology for the selection of voltage transformers is proposed, the application of which s modernization in the following aspects: due to the long service life and reduced work security, a replacing the operated voltage transformers ВТМ-10 in the indoor distribution system 10 kV with НК-12 transformers (for transformer connections) and НК-I-12 transformers (за measuring circuits) is proposed. These transformers are made with a laminated magnetic core of high permeability silicon steel. The low voltage winding is wound on the magnetic core and the primary high voltage winding composed of separate sections is mounted over it. The active part is covered with an epoxy resin compound with insulation class F. The proposed methodology can be used in the design and modernization of any kind of installations and systems with voltage transformers.


напреженови измервателни трансформатори разпределителна мрежа СрН електрически подстанцииvoltage measuring transformers MV distribution network electrical substationsVasil Dimitrov Gulek Nedjib

BIBLIOGRAPHY

[1] Cherneva G., E. Dimitrova. Operativno upravlenie na elektroenergiynata sistema v avariyni situatsii, N. Sp. „Mehanika, Transport, Komunikatsii“, t. 10, br.3/3, 2012
( [1] Чернева Г., Е. Димитрова. Оперативно управление на електроенергийната система в аварийни ситуации, Н. Сп. „Механика, Транспорт, Комуникации“, т. 10, бр.3/3, 2012 )

[2] Cherneva G., E. Dimitrova. Application of Intelligent Methods in Control of Crisis Situations in Energetics. XVII Int. Sc. Conf. “Crises Situations Solution in Specific Environment”, 30-31.05.2012. Zilina, Slovakia, Proceedings, pp. 211-216, 2012

[3] Milenov I., A. Semizorov, Naprezhitelni transformatori za vhoda na savremenni kompyutarni izmeritelni sistemi, Sbornik dokladi na VVTU, s. 568-571, 1997
( [3] Миленов И., А. Семизоров, Напрежителни трансформатори за входа на съвременни компютърни измерителни системи, Сборник доклади на ВВТУ, с. 568-571, 1997 )

[4] Naprezhenovi izmervatelni transformatori 110 kV, Tehnicheska spetsifikatsiya, ChEZ Razpredelenie Balgariya AD, 2017
( [4] Напреженови измервателни трансформатори 110 kV, Техническа спецификация, ЧЕЗ Разпределение България АД, 2017 )

[5] Ventilni otvodi 5-144 kV, http://www.acm-bg.com/index?m=320&lang=...
( [5] Вентилни отводи 5-144 kV, http://www.acm-bg.com/index?m=320&lang=... )

[6] Naprezhenovi izmervatelni transformatori tip NK-7.2, 12 i 24 kV, Tehnicheska spetsifikatsiya, ZAVN-Dobrich, 2010
( [6] Напреженови измервателни трансформатори тип НК-7.2, 12 и 24 kV, Техническа спецификация, ЗАВН-Добрич, 2010 )

 

 

 

This site uses cookies as they are important to its work.

Accept all cookies
Cookies Policy