1,721,215 research outputs found
End Life Behavior of Ester Liquids in High-Voltage Transformers
No full textIn this chapter, behavior of ester liquids are reported with an aim to understand the generation of decay particle (colloidal and soluble/dissolved particles) with aging. Thermal aging of oils is carried out as per ASTM D1934 in presence of cellulose and copper with aging history at elevated temperatures followed by analysis of colloidal and soluble particles. The aged and treated oils are characterized using diagnostic characterizations. The evolution and influence of colloidal and soluble decay contents for esters fluids and mineral oils are reported. The effect of colloidal particles on degradation of ester liquids is negligible, while degradation in mineral insulating oils is majorly governed by the colloidal particles. In addition, the potential of fuller's earth filtration for ester liquids is reported at different concentrations and different testing temperatures
Behavior of Ester Liquids Under Various Operating Fault Conditions
No full textThe present chapter discusses the gassing behavior of ester liquids under selected faulty condition. The fault conditions include corona discharging, arcing, and hotspot conditions. To understand the realistic gassing behavior, the said faults are simulated in the bulk of the insulating liquids at different aging conditions. This allowed authors to understand the influence of the state of the liquids (degradations) on the gassing tendency of various liquids. Dissolved gas analysis and diagnostic characterizations have been reported in the sections of the present chapter
Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids
No full textThis chapter presents the prebreakdown and breakdown phenomena to address the partial discharge (PD) behavior in various ester based liquids. The basic streamer theories, PD characteristic voltages, streamer propagating properties have been addressed in various sections of this chapter. The influence of various streamer governing parameters and PD testing approaches have been also enumerated. In addition, the research progress concerning the ester liquids vis-à-vis mineral insulating oils have been spanned in different sections of this chapter
Liquid Insulation for Power Transformers
No full textThis chapter provides a brief overview of the insulation liquids and transformer insulation. The aim of this chapter is to brainstorm few fundamental grounds that would simulate the readers and drive the focus to the insulating liquids – transformer perspective. The contents of this chapter also presents the significance of the contents in the book
Editorial Special Section on Liquid Dielectrics
No full textThis Special Section is part of a sequel of IEEE Transactions on Dielectrics and Electrical Insulation (TDEI) dedicated to papers focusing on liquid dielectrics which are normally published every three years. The tradition of having a number of issues on liquid dielectrics was initiated at the end of the last century by the IEEE TDEI Editor-in-Chief Prof. A. van Roggen and kept on by Prof. R. Hackam and Prof. E. Cherney. Starting in 2020, this tradition was maintained and relaunched by the actual IEEE TDEI Editor-in-Chief, Prof. Michael Wubbenhorst. Massimo Pompili (MP) has been involved as a Guest Editor of IEEE TDEI Special Issues on Liquid Dielectrics quite from the beginning (TDEI, vol. 5, 1998), at that time in cooperation with Prof. Ray Bartnikas and Prof. Carlo Mazzetti; this effort went on periodically, and from 2018, MP is sharing this role with Luigi Calcara (LC), a younger colleague at the University of Roma “La Sapienza,” Rome, Italy. The present 2023 Special Section was handled by Massimo Pompili, Luigi Calcara, and Issouf Fofana (IF) from the University of Quebec at Chicoutimi, Saguenay, QC, Canada. Hopefully, MP, LC, and IF will care also about the next Special Issue on Liquid Dielectrics expected for the end of 2026 or the beginning of 2027
Selected Papers from 2020 IEEE International Conference on High Voltage Engineering (ICHVE 2020)
Full text linkThe 2020 IEEE International Conference on High Voltage Engineering (ICHVE 2020) was held on 6–10 September 2020 in Beijing, China. The conference was organized by the Tsinghua University, China, and endorsed by the IEEE Dielectrics and Electrical Insulation Society. This conference has attracted a great deal of attention from researchers around the world in the field of high voltage engineering. The forum offered the opportunity to present the latest developments and different emerging challenges in high voltage engineering, including the topics of ultra-high voltage, smart grids, and insulating materials
Selected Papers from 2020 IEEE International Conference on High Voltage Engineering (ICHVE 2020)
No full textThe 2020 IEEE International Conference on High Voltage Engineering (ICHVE 2020) was held on 6–10 September 2020 in Beijing, China. The conference was organized by the Tsinghua University, China, and endorsed by the IEEE Dielectrics and Electrical Insulation Society. This conference has attracted a great deal of attention from researchers around the world in the field of high voltage engineering. The forum offered the opportunity to present the latest developments and different emerging challenges in high voltage engineering, including the topics of ultra-high voltage, smart grids, and insulating materials
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