{"title":"Evaluation of Physical-Chemical Characteristics of Mineral Oils Mixed with Synthetic Esters","authors":"M. Villaverde, D. U. Cuadros","doi":"10.23919/ARWtr.2019.8930179","DOIUrl":null,"url":null,"abstract":"In some control analyses of the power transformers, it is possible to find signs of contamination of the mineral oil with other insulating liquids, such as synthetic esters, natural esters or silicones due to problems in oil filling or maintenance procedures. Each of these liquids has different properties and applications, and their behaviour in service may be different from that of mineral oil. This paper shows the study of the basic physicochemical properties, such as the viscosity, oxidation, the acidity, the flash point and the dielectric dissipation factor (tan δ) of several concentration levels of a mixture of mineral oil (MO) and synthetic ester (SE), as low as 2% of SE/MO, and its correlation with the FTIR and UV-VIS signals. The results are applied to estimate the variation of the properties of several power transformers in service and improve the diagnosis of their condition assessment of the mineral oil.","PeriodicalId":117389,"journal":{"name":"2019 6th International Advanced Research Workshop on Transformers (ARWtr)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2019 6th International Advanced Research Workshop on Transformers (ARWtr)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.23919/ARWtr.2019.8930179","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
In some control analyses of the power transformers, it is possible to find signs of contamination of the mineral oil with other insulating liquids, such as synthetic esters, natural esters or silicones due to problems in oil filling or maintenance procedures. Each of these liquids has different properties and applications, and their behaviour in service may be different from that of mineral oil. This paper shows the study of the basic physicochemical properties, such as the viscosity, oxidation, the acidity, the flash point and the dielectric dissipation factor (tan δ) of several concentration levels of a mixture of mineral oil (MO) and synthetic ester (SE), as low as 2% of SE/MO, and its correlation with the FTIR and UV-VIS signals. The results are applied to estimate the variation of the properties of several power transformers in service and improve the diagnosis of their condition assessment of the mineral oil.
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