论文和技术资料

Surface discharge at the oil-pressboard interface has been classified as the most dangerous fault condition in power transformer because it results in catastrophic failure under normal operating conditions and difficult to be detected.

In order to understand the physical features of degradation on the pressboard surface as a result of surface discharge activity at the oil-pressboard, a model is developed using COMSOL Multiphysics on a 2-D axial symmetry plane. The model geometry has three media, i.e. the bulk oil region, transition region and bulk oil/pressboard region. In this work, three charge carriers, i.e. positive and negative ions and electrons are considered using charge transport equations to model the discharge streamer. These equations are coupled with the electrostatics and heat transfer equations to simulate the electric field distribution during the streamer propagation and to investigate the drying mechanism at the oil-pressboard interface respectively.