The aim of this paper is to present a concept for experimental testing of transformer oil-barrier insulation system. Design of insulation model is proposed with the purpose to avoid typical problems reported in literature concerning partial discharge testing of paper coated electrodes. Electric field between model electrodes is analyzed with methods commonly used in transformer insulation design - cumulative method and maximum electric field method. Model prototype is produced and tested to confirm functionality of the proposed concept. Also, model uncertainty is estimated to define model geometry influence on the test results.
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