Propagation of partial discharge pulses in winding

Abstract

A lot of measurements of the attenuation of partial discharge pulses on the model of winding was realized in the High Voltage Laboratory of the Czech Technical University in Prague. Current pulses from a charge calibrator were injected into different parts of winding and both the distortion of the charge and their deformations at the end terminals were observed and evaluated. It was confirmed that the apparent charge of a partial discharge, as a diagnostic parameter, is not relatively very sensitive, comparing to other diagnostic parameters, e.g. to the size or the shape of a partial discharge current pulse. The charge of the partial discharge current pulse on terminals was integrated by means of three different methods. It was found that the attenuation of the partial discharge pulse is significant. It was confirmed by all three evaluating methods with similar results. Furthermore, a measurement both of the attenuation of pulse and changes of partial discharge charge was realized on different types of winding. It resulted in the fact that the attenuation of the partial discharge charge on different types of winding depends on the winding parameters.