ASPECTS CONCERNING THE INFLUENCE OF THE TEMPERATURE ON THE OHMIC RESISTANCE OF THE WINDING TRANSFORMERS WITH RATED POWER 400 MVA

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-15-5 / ISSN 1314-2704, June 19-25, 2014, Book 4, Vol. 1, 19-24 pp

ABSTRACT
Electrical transformers having rated power of 400 MVA, represent the center of
gravity of electric substations related to Power System, therefore, the prophylactic
examinations have a major importance in preventing emergency arrangements and
ensure the reliability of these types of transformers. The paper aims to conduct a case study on 400 MVA block transformers, which converts electrical energy produced by synchronous generators of 330 MW from a voltage level of 24 kV to 400 kV voltage
level, feature of electricity transport aerial power lines with rated voltage of 400 kV.

Keywords: electrical transformer, ohmic resistance, temperature, transformer windings, medium voltage, high voltage