Impacts of Harmonic Voltage Distortions on the Dynamic Behavior and the PRPD Patterns of Partial Discharges in an Air Cavity Inside a Solid Dielectric Material

Abstract

The monitoring of partial discharges (PDs) is one of the main methods used worldwide for evaluation and diagnosis of the insulation conditions in equipment powered by medium and high voltages. The occurrence of PDs is usually an indication of the appearance of insulation defects, which over time can compromise the dielectric withstand of the material used, increasing the probability of complete breakdown. In general, laboratory tests for detecting and registering PDs are carried out using purely sinusoidal voltages. However, it is very common for an electrical asset to be subjected at some point in its operating life to voltages distorted by harmonic components. Some studies reported in the literature reveal that harmonic distortions can affect the PDs’ characteristics, nevertheless, the effects of individual harmonic components on PDs still need to be analyzed. In this context, this paper proposes to evaluate the impacts of harmonic voltage distortions on the dynamic behavior and the phase-resolved partial discharge (PRPD) patterns of PDs in an air cavity within a solid dielectric material. For this, a simulation model was implemented, which was used to analyze the effects of applying distorted voltages composed of different harmonic orders (third, fifth, and seventh) and distinct levels of distortion (1%, 3%, 5%, 10%, 15%, and 20%). In addition, the influence of the third harmonic phase angle on PDs is also analyzed. The results extracted from the simulations revealed that the harmonic distortions caused changes in the numbers of PDs per cycle, in the mean apparent charges of the PDs per cycle, and in the PRPD patterns’ characteristics. These changes were very significant for higher distortion levels, which in practice may impair the interpretation of PD measurement records for the diagnosis of the condition of the insulation system.

Influence of overvoltage waves on the development of partial discharges

“…In the model with a seed electron arises the question about the ratio of the rates of the processes. The model with a seed electron has been studied in detail in the works [ [7]; [8]] at sinusoidal and nonsinusoidal voltages with a harmonic composition up to the 20th harmonic. Verification of the model was carried out by comparing the phase distributions obtained in the simulation and in the experiment.…”

“…To take into account the distribution of PDs in magnitude, the three-capacitor model was supplemented with a seed electron appearance model [ [7]], which showed good agreement between the phase distributions of PDs obtained experimentally and by simulation for a wide range of non-sinusoidal voltages [ [7]; [8]]. The model assumes that PD in a defect occurs when two conditions are met: the electric field strength in the defect exceeds the value sufficient for the development of an electron avalanche and there is a seed electron in the defect.…”

“…The model assumes that PD in a defect occurs when two conditions are met: the electric field strength in the defect exceeds the value sufficient for the development of an electron avalanche and there is a seed electron in the defect. The model parameters were selected in such a way as to repeat the results given in the works [ [7]; [8]].…”

Novel Self-Organizing Probability Maps Applied to Classification of Concurrent Partial Discharges from Online Hydro-Generators

“…However, PD diagnostic methods rely on human experts to analyze the data, which is time consuming, costly, and limits the amount of data that can be inspected. While PD monitoring has standard methods to assess insulation health, real-world voltage distortions can affect how discharge responses appear [5]. Furthermore, multiple classes of discharges can emerge simultaneously [6].…”

“…The complex nature of PD patterns necessitates sophisticated analysis techniques. As noted in [5], real-world voltage distortions can significantly alter the appearance of discharge responses, making interpretation challenging. Furthermore, the simultaneous occurrence of multiple PD classes, as observed in [2,[14][15][16], further increases the difficulty of accurate classification.…”