Modelling of partial discharge behaviour in a cavity within the solid dielectrics

Review on Partial Discharge and Time Domain Reflectometry using Finite Element Analysis

“…Since the purpose of this paper is to investigate the technique of PD and TDR in finite element structure analysis, two different methods of application will be modelled and compared in this paper. COMSOL Multiphysics software is used based on studies in [23], [26]. Other than COMSOL Multiphysics, MATLAB Simulink are also used in determining cable fault as seen in [23] as it is competence in translating the language of COMSOL and at the same time, make it simple for user to plot data or functions, implement algorithms and build graphical user interface.…”

“…Study in [23] shows, PD can developed and simulated using finite element analysis using COMSOL to observe the difference characteristics and behavior of PD discharges in insulation medium of electric cable. Three different shapes of voids used in the experiment with different types of insulation.…”

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

“…The electron generation intensity is modelled as an increasing exponentially function with increasing voltage in the cavity (V C ). This corresponds to an enhanced emission of electrons from the cavity surfaces as the electric field strength increases [28]. Sometimes there is a lack of free electrons to start the electron avalanche; so the electron generation rate, N e (t), is treated as a stochastic process where at each time step (dt) an average number of free electrons which can be expected to arise (P) is N e (t)dt, as given in (3), the obtained value can then be compared to a random number R, uniformly distributed between 0 and 1 as given in (4).…”

3D Model of partial discharge in defects with different sizes and positions in power cable for distribution and transmission networks

“…frequency and magnitude of the applied voltage [7–9 ]. PD modelling is still an active research area and PD models can be classified into three main categories [10 ]: the three‐capacitance model or ‘a, b, c’ model [11, 12 ]; the analytical based model that uses the induced charge concept, proposed by Gutfleisch and Niemeyer [1 ] and Niemeyer [9 ]; the finite elements analysis (FEA) that uses electric current models or electrostatic models [13–17 ]. Each modelling type has its own strengths and weaknesses [10 ]. The three‐capacitance model can reproduce the transient related to a discharge event, describing the apparent charge magnitude and the PD current, but a possible limitation of treating the void surface as an equipotential surface is inherent [11, 12 ].…”

“…This assumption may not be true for large‐sized voids, or voids of highly irregular structure, where the surface charge distribution cannot be represented using an analytical based model [1, 9 ]. Finally, in FEA models of PD phenomena, the distribution of the electric field (E‐field) is determined numerically after defining the subdomain and boundary conditions [13–17 ].…”