PD behaviour of basic test arrangements under different measurement 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 point 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 basic arrangements representing corona discharges as needle-plane, needle-plane with insulating sheet and needle -sphere as well as artificial cavity into insulating material were investigated. In a previous paper the pd behaviour of the corona set-ups in air were already discussed. Additional to that the pd behaviour of typical internal pd source under different measurement condition is described. In this paper the most recognized values are compared at the well defined laboratory set ups as defined. During these investigations the standard evaluation methods according to IEC 60270, PRPD pattern and pulse sequence analysis is done. By comparing these three evaluation types the most significant method for the classification of failure types is discussed. For closer evaluation of image based evaluation methods like PRPD pattern and pulse sequence analysis different methods of classification are discussed. 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.

Analyses of partial discharges in dielectric samples under DC excitation

“…PD events were characterised by the magnitude and time of occurrence and some classification techniques were explored. The majority of work conducted to date has been focused on the analyses and evaluation of PD from controlled samples under AC conditions [2][3][4][5][6]. PD under AC conditions is well understood and is a developed measurement and post analysis process applied to AC equipment.…”

Partial Discharge Measurement under an Oscillating Switching Impulse: A Potential Supplement to the Conventional Insulation Examination in the Field

“…The time lag of the initiatory electron, the probability of avalanche formation, and the effect of space charge stabilization are involved. Although some studies and the reports of International Council on Large Electric Systems (CIGRE) workgroups [15][16][17] have summarized the availabilities of different types of voltages for examining the insulation status, the effectiveness of these voltages has not been quantitatively investigated through experiments.…”