Institute of Electrical Power Engineering I-22
http://www.i15.p.lodz.pl/en/index.htm
Head of the unit:
Paweł Rózga PhD, DSc, TUL Prof.
Potential promoters:
Paweł Rózga PhD, DSc, TUL Prof.
Contact person:
Paweł Rózga PhD, DSc, TUL Prof., phone 42-631-26-76, pawel.rozga@p.lodz.pl
Scope of activities:
The area of the team's activity includes research on modern solutions in the field of insulation systems of power transformers, including biodegradable insulating liquids (synthetic esters, natural esters, biodegradable hydrocarbons, fluids based on gas-toliquid technology) and high-performance solid insulating materials. The main part of research is aimed at assessing the dielectric strength of the liquid taking into account the physics of initiation, propagation and breakdown phenomena. The research uses optical techniques (shadowgraph photography in the light of a pulsed laser, static photography, light recording with the use of photomultipliers), electrical (breakdown voltage, partial discharge inception voltage) and statistical techniques (analysis with the use of selected random variable distributions). The research is carried out mainly on the basis of cooperation with leading manufacturers of insulation materials in the world as well as in cooperation with scientific international institutions from Canada, China, Czech Republic, Italy and France.
Present activities:
The current activities of the team are focused on comparative tests of the gas-to-liquid insulating fluids and the biodegradable hydrocarbons with classic mineral oils in terms of behavior at exposure to lightning voltage stresses. At the same time, research is carried out on the efficiency of these fluids in terms of impregnation of solid insulation components using various parameters of the drying and impregnation process.
Future activities:
Within the future work, it is planned to validate selected insulating fluids in terms of their operation at higher temperatures (in the range of 20-110 °C). It is planned to perform the tests at impulse and alternating voltage. It is also planned to verify the cooperation of selected fluids with solid insulation components on the basis of the dielectric tests in the system of insulated electrodes.
Publications/patents, awards, projects:
- Rózga P., Jayasree T., Mohan Rao U., Fofana I., Picher P., Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids, Book Chapter in “Alternative Liquids Dielectrics for High Voltage Transformer Insulation Systems: Performance Analysis and Applications, 2022, Wiley-IEEE Press, 147-183
- Rózga P., Kraslawski A., Klarecki A. Romanowski A, Krysiak W., A New Approach for Decision Support of the Selection of Construction Technology of High-Voltage Substations Based on AHP Method, IEEE Access, 2021, 9, 73413-73423.
- Rózga P., Beroual A., Przybyłek P., Jaroszewski M., Strzelecki K., A Review on Synthetic Ester Liquids for Transformer Applications, Energies, 2020, 13(23), 6429.
- Mohan Rao U., Fofana I., Beroual A., Rózga P. et al., A review on pre-breakdown phenomena in ester fluids: Prepared by the international study group of IEEE DEIS liquid dielectrics technical committee, IEEE Trans. Dielectr. Electr. Insul., 2020, 27(5), 1546-1560.
Keywords:
Biodegradable dielectric liquids, high-performance solid insulation, impregnation, dielectric tests,
List of internship proposal in this research team:
Cooperation in the field of testing the insulating liquids at impulse and alternating voltage in the temperature range of 20-110 °C and in the system of insulated electrodes.
The portfolio of research groups was created as part of the Programme "STER" – Internationalisation of doctoral schools” as part of the realization of the project “Curriculum for advanced doctoral education & taining – CADET Academy of Lodz University of Technology”.