PD behaviour of basic test arrangements under different measurement and evaluation conditions

Abstract

The PD behaviour of so called basic test arrangements as for corona discharge or other discharge sources seems to be well known from the physical side of view. On the other hand the measurement results and, in the same manner, their identification and interpretation can be different, because this is depending on the measurement or evaluation conditions. Therefore some typical corona basic arrangements representing corona needle-plane, needle-plane with insulating material and needle-sphere are investigated. The measurements are carried out under different measurement conditions especially the selected frequency range of the measuring system. For some effects the reproducibly, the voltage dependence and the changes over time of the PD behaviour are investigated. These results were evaluated using the applied and the updated version of IEC 60270. Furthermore the IEC 60270 and additional publications provide a lot of possible of the post evaluation of the measured PD signals. In this paper the most and most recognized values are compared at the well defined laboratory set ups as defined. Additional these results are compared with the results of the Pulse-Sequence-Analyzing method. The presented results show surprisingly characteristic shapes of the PD pattern, which allow the better classification of the types of PD sources and their identification respectively.