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Master's Thesis
Author of thesis: Ing. Ondřej Švábek
Acad. year: 2025/2026
Supervisor: Ing. Michal Krbal, Ph.D.
Reviewer: Ing. Luděk Pelikán
The final thesis focuses on the theoretical background of liquid dielectrics, their dielectric parameters, and their dependence on temperature. The aim of this thesis is to analyze and compare selected insulating liquids in terms of their dielectric properties and practical applicability. The thesis provides an overview of insulating oils and esters used in technical practice and examines standardized methods for measuring dielectric parameters, including bridge methods, comparative methods, and direct methods using a heating system. In the experimental part, the measurement setup is described in detail, a measurement procedure is proposed, and used to evaluate the tested samples. The results show differences in key dielectric parameters, such as dissipation factor, relative permittivity, and dielectric strength depending on temperature. Finally, the investigated liquid dielectrics are compared not only in terms of their electrical properties but also with respect to environmental impact and economic cost, providing a comprehensive evaluation of their suitability for practical applications.
Liquid dielectric, mineral oil, vegetable oil, synthetic liquid, synthetic and organic ester, natural gas, nanoadditives, breakdown voltage, relative permittivity, dissipation factor, volume resistivity.
Date of defence
16.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Student seznámil komisi s výsledky své diplomové práce. S posudky seznámil komisi vedoucí práce Dr. Krbal. Vedoucí práce hodnotil stupněm A se 100 b. Oponent hodnotil stupněm A s 95 b. Následnou rozpravu zahájil Dr. Krbal položením otázek oponenta. Doplňující dotaz položil Dr. Bátora k metodice statistického vyhodnocení. Doc. Baxant se dotázal na možnosti syntézy olejů využitím solární energie bez fosilních zdrojů. Student bez výhrad odpověděl na dotazy.
Language of thesis
Czech
Faculty
Fakulta elektrotechniky a komunikačních technologií
Department
Department of Electrical Power Engineering
Study programme
Electrical Power Engineering (MPC-EEN)
Composition of Committee
prof. Ing. Petr Toman, Ph.D. (předseda) doc. Ing. Petr Mastný, Ph.D. (místopředseda) Ing. Branislav Bátora, Ph.D. (člen) Ing. Štěpán Foral, Ph.D. (člen) Ing. Michal Krbal, Ph.D. (člen) doc. Ing. Petr Baxant, Ph.D. (člen) Ing. Martin Kašpírek, Ph.D. (člen)
Supervisor’s reportIng. Michal Krbal, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Luděk Pelikán
Grade proposed by reviewer: A
Responsibility: Mgr. et Mgr. Hana Odstrčilová