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Etude des huiles et des mélanges à base d'huile minérale pour transformateurs de puissance – Recherche d'une mélange optimal

Abstract : Mineral oil is the most commonly used insulating liquid in power transformers due to its low price and its good properties. However, the performances of this oil start to be limited with respect to the new requirements. Two ways are considered to solve this problem: find substitution liquids or improve the properties of mineral oil. We are interested by the second solution. Our work consists in mixing mineral oil with others types of insulating liquids for transformers, and finding the best oil mixture based on mineral oil. For that, we consider two types of insulating oils as additives: silicon and synthetic ester oils. We analyze and compare these liquids as well as mixtures of these liquids, on the basic of the main properties required for an insulating liquid to be used in a power transformer, namely the miscibility, heat transfer, breakdown voltage, ageing stability and charge density. Different mixtures with different concentrations were studied, however, due to technical and economical reasons, we essentially present the results concerning mixtures based on 80% of mineral oil with 20% of other oils. Through the different tests we realized, it appears that each oil type has an advantage. Mineral oil is the most efficient to transfer the heat due to its low viscosity, synthetic ester oil presents the best dielectric strength due to its high water solubility, and silicon oil ages slower. This work also gives prominence to the mixture 80% of mineral oil and 20% of synthetic ester oil as a good compromise to get a liquid better than mineral oil alone. In that sense it appears that this mixture improve the characteristics of mineral oil without degrading its good properties and by staying in a reasonable cost. Indeed, this mixture present, with respect to mineral oil alone, practically the same capacity to evacuate the heat, a higher dielectric strength, a better ageing stability and a moderate charging tendency.
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  • HAL Id : tel-00141418, version 1

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Christophe Perrier. Etude des huiles et des mélanges à base d'huile minérale pour transformateurs de puissance – Recherche d'une mélange optimal. Autre. Ecole Centrale de Lyon, 2005. Français. ⟨tel-00141418⟩

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