Pre-breakdown and breakdown Currents and correlated light emissions analysis in liquid dielectrics

Condition monitoring and fault diagnostics plays a very important role in the production security and the product quality. The demand for monitoring and fault diagnosis of power systems has increased the efforts to develop new analysis techniques. A wide variety of techniques were used for this purpose. In this work, a systematic survey on positive and negative streamers currents and corresponding emitted lights has been led in three liquid dielectrics: Mineral oil, tetraester and toluene, and the results are presented and discussed with regard to their energy and frequency parameters. This study will mainly investigate real time techniques for signal identification of electrical discharges of different energy levels mainly in transformer mineral oil in order to identify the steamers…