Numerical resolution of charge transport in cross-linked polyethylene by means of a bipolar model with a distribution of traps

Boufayed, F.; Leroy, Georges; Teyssèdre, G.; Laurent, Christian; Ségur, P.; Cooper, Elizabeth; Dissado, L. A.; Montanari, G

doi:10.1109/icsd.2004.1350493

Cited by 9 publications

(10 citation statements)

References 6 publications

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“…This favors local large current densities that may cause the formation and growth of local conductive paths, leading to breakdown once they reach a critical length [25][26][27][28][29]. In practical insulating systems, these phenomena are generally localized at interfaces between the bulk insulation and defects (such as protrusions and metallic inclusions), which are able to magnify the local electric field significantly with respect to the average design field, or associated with field amplification due to huge bipolar space charge accumulation, that can happen in the presence of strongly injecting electrodes and ionic contaminants [30][31][32].…”

Section: Field Limited Space Charge Modelmentioning

confidence: 99%

Electrical aging and life models: the role of space charge

Mazzanti

Montanari

Dissado³

2005

IEEE Trans. Dielect. Electr. Insul.

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218

112

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This paper has the aim of providing a view of a lively debated topic which has broad impact on the design of electrical apparatus and new insulating materials, that is, the interaction between space charge and aging processes of polymeric insulation. Aging models developed in recent decades that consider explicitly or implicitly the contribution of space charge to insulation degradation, under both dc and ac voltage, are dealt with, with the intention to point out their range of validity. Some conventional phenomenological models that have been used for much more than two decades without referring to space charges can be exploited to account for electrical field and activation energy modification due to space charge. These, together with models conceived considering space charges as the driving force for aging, are especially examined. In addition, recent models that disregard the action of space charge as an ageing factor, but consider space charge as the consequence of degradation processes are also discussed.

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Section: Field Limited Space Charge Modelmentioning

confidence: 99%

Electrical aging and life models: the role of space charge

Mazzanti

Montanari

Dissado³

2005

IEEE Trans. Dielect. Electr. Insul.

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218

112

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“…The complete sensitivity analysis of each parameter has already been published elsewhere [30]. We recall here only the impact of the upper filled level at the interface  f0 , and, as the spatial grid is specific, we also present the influence of the number of discretization points on the simulations results.…”

Section: Parameters Sensitivity Analysismentioning

confidence: 99%

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Taleb

Teyssèdre

Roy

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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From a brief review of the literature, it is shown that surface states within dielectrics represent a critical step in charge injection whereas only scarce physical descriptions of these phenomena are available. It is confirmed from space charge measurements on low density polyethylene (LDPE) that the work function of metals used as electrodes does not correlate to injected charge quantities, thereby supporting the need for alternative descriptions of injection to the Schottky law. Hence, the influence of surface states on space charge formation in LDPE is investigated using a onedimensional model of electronic charge injection and transport under dc voltage. Transport and trapping in the bulk of the insulation are accounted for using an exponential distribution of traps with a maximum limit in trap depth. We have modeled interface states considering the same form of distribution, hypothesizing an increasing density of states and trap depth when approaching the surface. We suppose that the interface region with modulated properties extends over 1µm from both surfaces of the 200 µm thick insulation. We also considered a reservoir of charge for providing carriers into the dielectric, instead of a classical injection law. After a sensitivity analysis of model parameters on space charge results, we present simulation results on charge injection for a unipolar and a bipolar model. It is shown that the presence of surface states and the reservoir of charges could explain the particular behavior of charges observed experimentally, as regards heterocharge accumulation, and field enhancement.

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“…When T Ӷ T 0 , only a fraction n f of the total carrier density n is involved in transport: this corresponds effectively to carriers trapped at an energy within k B T in respect to ⌬ f , 13,21,22 …”

Section: ͑13͒mentioning

confidence: 99%

“…13 This means that an upper filled level, ⌬ f ͑x , t͒, can be defined, which is time and space dependent. The relation between carrier density, for one specie, and ⌬ f is of the form…”

Section: Transport and Trappingmentioning

confidence: 99%

“…10,11 Meanwhile, only a few attempts have been made to provide some model description of these experimental results. [12][13][14][15][16] We have initiated an activity which aims at modeling charge transport phenomena in a synthetic insulator largely used in the high voltage area: polyethylene. The aims are to account for the internal distribution of field as a function of stress, which could be used in the future to feed aging models, since, whatever the aging scenario considered, the local field is an important parameter.…”

Section: Introductionmentioning

confidence: 99%

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Models of bipolar charge transport in polyethylene

Boufayed

Teyssèdre

Laurent

et al. 2006

Journal of Applied Physics

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164

130

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We introduce and develop two bipolar transport models which are based on appreciably different physical assumptions regarding the distribution function in the energy levels of trap states. In the first model, conduction is described by an effective mobility of the carriers and the accumulation of stored space charge is taken into account through a single trapping level. In the second model the hypothesis of an exponential distribution function of trap depth is made, with conduction taking place via a hopping process from site to site. The results of simulations of the two models are compared with experimental data for the external current and the space-time evolution of the electrical space charge distribution. The two descriptions are evaluated in a critical way, and the prospects for these models to adequately describe real systems are given.

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Numerical resolution of charge transport in cross-linked polyethylene by means of a bipolar model with a distribution of traps

Cited by 9 publications

References 6 publications

Electrical aging and life models: the role of space charge

Electrical aging and life models: the role of space charge

Modeling of charge injection and extraction in a metal/polymer interface through an exponential distribution of surface states

Models of bipolar charge transport in polyethylene

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