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Transformer development is limited to smaller sizes and larger capacities due to two major shortcomings: first, the solid insulation that is used in an oil-immersed transformer, which is generally cellulosic paper, cannot resist high temperatures, and second, the significant difference in the dielectric constants between the cellulose paper and the transformer oil will lead to an uneven electric field...
The dielectric constant and the high temperature resistant performance of solid insulation used in oil-immersed transformer would limit the capacity and size of an oil-immersed transformer. In this paper, kraft paper and polycarbonate has been aged under 90 °C, 110 °C and 130 °C up to 300 days, simultaneously an electric pre-stressing of 3kV/mm is performed. The dielectric spectroscopy (here refer...
Traditionally, oil-filled transformers have utilized cellulose paper as primary insulation. However, cellulose insulation is a relatively low temperature material and thermal degradation due to overload conditions and long-term aging can lead to transformer failures, Therefore, it restraints the development of high density power transformers. What's more, since the transformer oil has a relative dielectric...
Traditionally, oil-filled transformers have utilized densified cellulose paper as the primary conductor insulation. However, cellulosic insulation is a relatively low temperature material and thermal degradation due to overload conditions and long-term aging can lead to transformer failures. In order to improve the structure and insulation performance of oil-filled transformers, this paper choose...
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