RT Journal Article
T1 A Multiphysical model to study moisture dynamics in transformers
A1 García de Burgos, María Belén
A1 Villarroel Rodríguez, Rafael David
A1 García Gómez, Diego Fernando
AB Moisture is one of the key variables that must be considered when determining the load profiles that can be safely applied to a transformer. The presence of high amount of water accelerates the aging rate of the transformers solid insulation, shortening the life expectancy of the equipment. Moreover, the dynamic processes of moisture migration between paper and oil must be considered in order to avoid a potential cause of failure, such as the formation of bubbles in the paper-oil interface, or the moisture saturation and the subsequent formation of liquid water in oil. These processes are linked to the changes in temperature; however, within the transformer, both processes have very different time constants, which complicates the analysis. In this paper, a mathematical model is presented, which allows us to study the moisture dynamics in a transformer. The model considers a multi-physical approach incorporating a thermal module and a moisture dynamic module that makes it possible to analyze the behavior of the moisture for a certain load profile. Some application cases are included in this paper to illustrate the model operation.
PB IEEE
SN 0885-8977
YR 2019
FD 2019-08-01
LK https://hdl.handle.net/10016/35796
UL https://hdl.handle.net/10016/35796
LA eng
NO This work was supported by the Spanish Ministry of Economy and Competitiveness under Grant DPI2015-71219-C2-2-R. Paper no. TPWRD-01091-2018.
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RD 18 jul. 2024