Bipolar model for electrical breakdown in polyethylene materials under dc high electrical fields

Physical factors influencing dielectric polymer electrical breakdown by generated space charges under a strong electric field

“…These formulations are based, particularly, on the time evolution of the external current generated by the space charge dynamics within an insulator material sandwiched between two electrodes and subjected to a strong dc applied electric field. The results, obtained by this works, show the aspect of the electric breakdown marked by sudden jump of the external current density during its evolution in time and that comes earlier and earlier as the applied electric field is more and more intense [2,20,21]. These observed electrical instabilities have been attributed to the local distortions of the electric field caused by the generated bipolar charges.…”

“…These distortions can intensify under several stresses and thus leading to overstressing that can exceed the dielectric strength. This phenomenon can cause degradation, premature aging of the dielectric that limits its lifetime and even the occurring of the partial or the total breakdown of the material [2,4,7,[15][16][17][18][19][20].…”

“…Following the assumption of space charges, some theoretical modeling works have been developed in order to study this fact and their generated effects such as the breakdown phenomena [16][17][18][19][20][21]. Indeed, among these theoretical approaches, the bipolar charge transport model has been considered as the most important formulation for better understanding the dynamics of space charges and the mechanisms involved during their evolutions in the insulating material [16].…”

“…In this context, some previous theoretical formulations have been applied to the bipolar transport problem in order to study the breakdown phenomenon by space charge dynamic process [17][18][19][20][21][22]. These formulations are based, particularly, on the time evolution of the external current generated by the space charge dynamics within an insulator material sandwiched between two electrodes and subjected to a strong dc applied electric field.…”

Bipolar electronic charge transport model under trap density Gaussian spatial distribution: application to dielectric polymer interfaces

“…Principally, these characterizations have the theoretical aspects that are based on physical and numerical modeling developed for the transport problem and concerning by the dynamics of space charges generated in the mentioned materials. In addition, a significant part of our contributions has been devoted to the problem of thermo-electrical breakdowns within insulating materials, generated by electronic charge packets under strong dc applied electric fields [12,13].…”