Physical models for field based partial discharge measurements

Abstract

Current models of partial discharge (PD) behaviour are focused on the reproduction of deterministic, experimental data. This data is traditionally taken under strictly controlled conditions and thus exhibits minimal noise. This contrasts field PD measurements which exhibit high levels of stochasticity and extreme sensitivity to on-site conditions. In this paper partial discharge measurements are simulated from three-phase cable experiments, which aim to imitate conditions found in the field. The results show good agreement between experimental and simulated data, in terms of both phase resolved plots and non-linear invariants. The numerous additions and improvements required to describe PD behaviour in field equipment are discussed, and will form the basis for future work.

Modeling partial discharge in a three-phase cable joint experiment with minimal adjustable parameters

“…It is an encouraging result that a PD model with relatively few free parameters was able to reproduce data from a three phase cable experiment at rated conditions. The model represents an improvement over an earlier model by the authors of the same experiment that required a larger number of free parameters to fit the data, including extra stochastic terms, and did not consider the defect geometry [17].…”

Study on the Effect of Void Geometry and Location on Electric Field Distribution and Partial Discharges in HVDC Cables

“…The characterization of the electric field enhancement factor depends on parameters such as the outline and dimension of the protrusion yields [19][20][21][22] ∏ =Emax/E0 where Emax is the maximum field strength located at the tip of the protrusion and E0 is the average electric stress without protrusion. Three primary layers work together to mold a standard Extra High Voltage DC subterranean power line into a specified shape.…”

Investigating the effect of cavity size within medium‐voltage power cable on partial discharge behaviour

“…The model developed in [8] studied the influence of cavity size and material temperature on PD activity, while it simulated PD activity in the void under square waveform applied voltage under different amplitudes of the voltage in [7], in [9] it studied the effect of different amplitudes and frequencies of the applied voltage and finally in [10] it simulated the sequence of PDs in the cavity under variable frequency. It is still a lack of applying these advanced modelling on the power cables, as a lot of the researchers studied only the distribution of electric potential and field across cable layers with a cavity using COMSOL multiphysics such as [11][12][13][14] while a little of researchers studied the voltage at the cavity and the obtained PD magnitudes such as [15,16] taking into consideration the distribution of charges on the void wall, decay rate of charges by surface conduction, inception field, extension field and electron generate rate through surface emission and volume ionisation.…”