Partial discharge measurement in imprefections of oil-paper insulating systems

Abstract

The paper deals with partial discharges (PD) measurement of oil-paper insulating system. This system is usually used in bushings, power cables and power transformers. The experiment consists of two parts. The first part is PD measurement of oil-paper samples represent transformer winding insulation. They were composed of a small copper bar overlapped by a transformer paper. In the paper insulation the two types of non-homogenous areas were created. The second part of the experiment was focused on statistical evaluation of ignition voltages in these areas. PD measurement were realised in mineral and environmentally friendly oil.