Translated Abstract
The transformer as the core equipment in the power system plays the role of transmission and distribution of electricity. The number of oil-immersed transformers is largest in the grid, and insulating oil in the transformer to play the role of insulation, cooling and extinguishing arc. At present, the most commonly used insulating oil is mineral insulating oil, but mineral insulating oil is low fire point, non-renewable and harmful to the environment. With the increasing safety and environmental protection requirements of society, it is of great meaning and market prospects to develop environment-friendly nature ester insulating oil transformer.
In this paper, a kind of nature ester FR3 and 25 # mineral insulating oil were used as the research object, and the insulating oil treatment platform was set up. The evaluation methods of the physical and chemical properties of the insulating oil were studied. The physical and chemical properties of the two kinds of insulating oilafter pretreatment were analyzedcomparatively. Thebreakdown characteristic and temperaturecharacteristicsofrelativedielectric constant, loss factor and volume resistivity of the two kinds of insulating oil were studied. And the author mastered the performance differencesbetween nature ester and mineral oil.
The relationship between the drying time and the moisture content of insulating pressboard and the relationship between the impregnation time and the breakdown field strength of the oil impregnated pressboard were also studied in this paper. Thebreakdown characteristic and temperature characteristicsofrelative dielectric constant and dielectric loss of the two kinds of insulating oil impregnated pressboard were fully compared. The paper put forwardthat the oil transformer design and development process need to focus on nature ester and solid material compatibility, electrical insulation with temperature control and the key points of cooling structure design.
Based on the basic characteristics of two kinds of insulating oil and oil impregnated pressboard and the key points of transformer design, a 110kV power transformer simulation model was established. The electric field and the cooling structure temperature field of nature ester and mineral oil transformer were calculated respectively. The result show that temperature and other indicators were meet the relevant standards. This work laid the technical foundation of the wide application for thenature ester in the 110kV power transformer.
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