@conference{10902/36155,
year = {2024},
url = {https://hdl.handle.net/10902/36155},
abstract = {The need to replace mineral oils used in the cooling and insulation of transformers has led to the development of various alternatives. The most promising options include synthetic and natural esters of various origins. However, based on the available information and the studies conducted under different conditions, it is not possible to determine if the long-term behaviour and properties of all esters are the same. This work analyses the five main commercial esters (sunflower, rapeseed, soybean, palm and synthetic) and their degradation when combined with kraft and thermally upgraded papers. The insulating materials were aged along with copper at 130 °C in sealed glass vials. The performance of the fluids was studied through the measurement of moisture content, acidity, interfacial tension, and dielectric dissipation factor. Moreover, the ageing of the cellulosic materials was monitored by the reduction of the polymerisation degree. The results showed that there are significant differences between esters of different origins. Furthermore, the properties of the esters were affected by the paper they were combined with.},
organization = {This research was funded by the European Union’s Horizon 2020 polymerisation degree (DP), following the IEC 60450 Research and Innovation Program, through the Marie Sklodowska-Curie, under Grant 823969, and by the Ministry of Economy, through the National Research Project: Gestión del Ciclo de Vida de Transformadores Aislados con Fluidos Biodegradables, under Grant PID 2019-107126RBC22. Also, the work of Cristina Méndez was supported by the Spanish Ministry of Science, Innovation and Universities, through the Ph.D. Scholarship by
Formación de Profesorado Universitario (FPU), under Grant FPU19/01849.},
publisher = {Institute of Electrical and Electronics Engineers, Inc.},
publisher = {IEEE 5th International Conference on Dielectrics (ICD), Toulouse, France, 2024, 451-454},
title = {Analysis of the degradation of five esters and the effect of the cellulose on their properties},
author = {Méndez Gutiérrez, Cristina and Oezdemir, Büsra and Werle, Peter and Olmo Salas, Cristian and Quintanilla Cavia, Pedro José and Ortiz Fernández, Alfredo},
}