Effect of Electrical Accelerated Aging on DC Resistivity of Mineral Oil Used in Power Transformers

Power transformers are still equipment of primary importance within power grids. The recent paradigm changes registered in the field energy require interconnection electrical grids much larger areas, even up to level an entire continent. In this context, knowing state and that is essential aspect ensure safe operation conditions. present work related vulnerability oil–paper insulation systems different aging factors their quick degradation under certain regard, study proposed paper considers measurement DC resistivity on mineral oil samples contaminated with small amounts accelerated action high-strength electric partial discharges. absence standardized procedures for oil, original method presented discussed previous articles used. obtained results clearly indicate stress, decreases significantly, showing oil’s properties worsen.