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High-temperature dry-type transformer economics
Electrical Engineering, 1952THE ADVENT OF high-temperature insulations, such as silicones, has moved upward the possible design limit due to deterioration of insulation with temperature. Formerly, the transformer designer used insulation to the temperature limit dictated by its aging characteristics and a reasonable life.
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Corona free structures for dry type transformers
1960 EI National Conference on the Application of Electrical Insulation, 1960Dry type transformers arc transformers in which the dielectric medium is atmospheric air or nitrogen. Some are ventilated or free breathing while others are hermetically sealed. In both kinds the principal dielectric medium-air or nitrogen — has a dielectric constant of unity while the available insulation materials have dielectric constants ...
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Characteristics of dimension restrained dry-type transformers
Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting, 2002It is pointed out that dry type transformers are often restrained in one or more directions to permit their use in confined areas. This is particularly true in underground coal mines where the height is limited by the seam thickness. The historical increase in machinery horsepower fuels the escalation of transformer capacity required within these ...
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Hottest spot temperatures in ventilated dry type transformers
IEEE Transactions on Power Delivery, 1994The hottest spot temperature allowance to be used for the different insulation system temperature classes is a major unknown facing IEEE Working Groups developing standards and loading guides for ventilated dry type transformers. In 1944, the hottest spot temperature allowance for ventilated dry type transformers was established as 30/spl deg/C for 80 ...
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Thermal evaluation of dry-type transformer insulation systems
1969 9th Electrical Insulation Conference, 1969The concept of accelerated functional testing of insulation materials and systems got great emphasis near the start of the second half of this century. This interest was spurred on when Dr. Dakin1 illustrated that insulation deterioration conformed to the Arrhenius chemical rate equation.
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An Improved Calculation Method for Magnetic Flux Leakage of Dry-Type Transformer
Lecture Notes in Electrical Engineering, 2022Zhang Guangyu
exaly