3/28/2023 0 Comments Dispersio. in cabling![]() ![]() Įxisting propagation models for partial discharges, including those based on transmission lines, usually yield to a nearly constant propagation velocity. It is difficult to estimate their parameters, mainly due to the cable complex structure, as well as the lack of knowledge about the high frequency behavior of its materials. But these models have the following disadvantages:. Published propagation models are based on classical transmission line (TL) approaches, ,. To get an accurate location of the area where partial discharges are being generated, it is necessary to know how these PDs propagate along the cable. Locating PD sources allows to identify the cable degraded areas and, preventively, replace it to avoid a power outage that could affect hundreds of subscribers. The observation of the phenomenon known as partial discharge (PD) in cables allows engineers to predict imminent failures in medium voltage (MV) distribution networks. These results have been compared to the measurement obtained in a medium voltage test bench where intentionally induced PDs have been captured and processed, confirming the results of attenuation, delay and dispersion predicted by the proposed model. The parameters of the proposed model have been estimated using a vector network analyzer for a XLPE cable. Additionally, the proposed model provides the velocity of each PD frequency component, which is crucial to get an accurate estimation of the PD source location. Simulation results show that the peak value and width of the propagated PD pulse are similar to those obtained with the proposed model. The proposed model explains how the PD is attenuated, delayed, and dispersed due to the fact that each frequency component is differently delayed.Ī closed-form expression is proposed for the PD peak value and width, and a method to derive the model parameters from a reference model existing in the bibliography. This paper proposes a new model based on a complex propagation term whose real component does not depend on the frequency ( f), and whose imaginary part is modeled with a second order polynomial in f. Existing models for partial discharge (PD) propagation based on a single attenuation constant are unable to explain how each frequency component travels with a different propagation velocity. ![]()
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