Field-enhancing defects in polymeric insulators causing dielectric aging

Baumann, Th.; Fruth, B.; Stucki, F.; Zeller, H. R.

doi:10.1109/14.46340

Cited by 53 publications

(17 citation statements)

References 8 publications

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“…>100-200 kV/mm) the conductivity of insulating polymers can be enhanced by several orders of magnitude, due to the dependence of the activation energy on electric field. 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%

“…Approaches following these premises have been developed by Zeller [25][26][27] and Boggs [28,29] having the common background of the so-called Field-Limited Space-charge Current (FLSC) theory. According to FLSC theory, there is a threshold field, E c , below which injected charges possess a low but finite mobility so that over a long period of time the equilibrium situation predicted by the Space Charge Limited Current (SCLC) model [11,12] will result.…”

Section: Field Limited Space Charge Modelmentioning

confidence: 99%

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Electrical aging and life models: the role of space charge

Mazzanti

Montanari

Dissado³

2005

IEEE Trans. Dielect. Electr. Insul.

213

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%

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.

213

112

View full text Add to dashboard Cite

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“…Imperfections such as contaminants and impurities in an insulator diverges the electric field across the insulator, resulting in a local stress enhancement at the imperfection sites. This leads to performance deterioration of the insulator [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Characteristics in LLDPE-Natural Rubber Blends: Correlating Electrical Quantities with Surface Degradation

Aulia

Ahmad²,

Abdul‐Malek³

et al. 2016

Journal of Electrical Engineering and Technology

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-Partial discharges (PD) lead to the degradation of high voltage cables and accessories. PD activities occur due to the existence of impurities, voids, contaminants, defects and protrusions during the manufacture and installation of power cables. Commonly, insulation failures occur at cable joints and terminations, caused by inhomogeneous electric field distributions. In this work, a blend of natural rubber (NR) and linear low density polyethylene (LLDPE) was investigated, and the optimal formulation of the blend that could resist PD was discussed. The experiments were conducted under a constant high voltage stress test of 6.5 kV AC and the magnitude of partial discharge activities was recorded using the CIGRE method II. Pattern analysis of PD signals was performed along with the interpretation of morphological changes. The results showed that the addition of 10 wt% of NR and 5 wt% of Alumina Trihydrate (ATH) provided promising results in resisting PD activities. However, as the NR content increased, more micropores existed, thus resulting in increased PD activities within the samples.

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“…In this figure a considerable delay time in the fmt appearance of the electrical tree is evident, while the intensity of the discharge signals increases continuously with time. Of significance at this point is prior work by Zeller and coworkers (11). During their studies of dielectric aging, they concluded that charge injection from field enhancement is the fust step in a series of pre-treeing events.…”

Section: Resultsmentioning

confidence: 93%

Partial discharge signals from TR-XLPE insulated cable

Morel¹,

Srinivas²,

Bernstein³

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation

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This paper reports on signal measurements from an mag& TR-XLPE-insulated cable at constant voltage stress, prior to the onset of partial discharge, as Conven~OnaUY measured in time domain technique. Although physical events relating to filtering out noise and phase resolution were thoroughly reviewed. The authors claim that such signals had never previously been detected..~I . -increases logarithmically with time, both prior to and after a.thickness iS not reported). The fast pulses appear during the electrical tree is observed. Tree retardant components in the 'first few days' (-1-1.5 fc) and the slow pulses appear after insulation do not prevent such signals from appearing. Relevant 20-25 days. Information on rise time, decay time and peak are reports have been summarked and relevance to aging all reported. Probes were employed at both the treed and nonphenomena are discussed.treed region of the polyethylene, and the regions compared.

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Field-enhancing defects in polymeric insulators causing dielectric aging

Cited by 53 publications

References 8 publications

Electrical aging and life models: the role of space charge

Electrical aging and life models: the role of space charge

Partial Discharge Characteristics in LLDPE-Natural Rubber Blends: Correlating Electrical Quantities with Surface Degradation

Partial discharge signals from TR-XLPE insulated cable

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