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Abstract
AC breakdown voltage characteristics of different insulation materials in transformer oil are investigated. The aim is to reduce the quantity of expensive transformer oil by adding Filler (insulation material) to reduce the cost of the transformer oil without compromising its electrical properties. Experiments are conducted for two insulation materials, aluminium oxide and silicon dioxide. Both of these materials are tested in horizontal and vertical electrode arrangements. After introducing the Filler and selecting its optimum quantity, Nomex paper (E 56) is added to enhance the breakdown strength of the model. Combination of Nomex paper (E 56) and Filler acts as a barrier and thus enhances the breakdown strength of the model. Dielectric constant, resistivity and conductivity are calculated to investigate the variations in electrical properties of the model. Based on experimentation, optimum condition for the addition of Filler and Nomex paper (E 56) in the transformer oil is proposed. Detailed result of using composite insulation is discussed in this paper.
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