Predicting electrical breakdown in polymeric insulators: from deterministic mechanisms to failure statistics

Dissado, L. A.

doi:10.1109/ceidp.2002.1048725

Cited by 8 publications

(17 citation statements)

References 52 publications

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“…The features of tree propagation in solids are broadly understood to be related to discharge action in gasfilled tubes or charge injection from conducting tube walls [19,22]. The tree inception process, which usually determines the time to breakdown [24] is much less clear [19,25]. In solid materials however, and under alternating voltages stress, it is generally accepted that electrical tree inception is associated with charge injection in and extraction from a region of high alternating electrical stress, as evidenced from the electroluminescence these currents generate [26][27][28].…”

Section: General Features Of Electrical Tree Formationmentioning

confidence: 99%

Analysis of electrical tree inception in silicone gels

Mancinelli

Cavallini

Dodd

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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This work assesses the initial and crucial part of electrical treeing degradation, the inception stage, focusing on its dependence on applied voltage waveform and frequency. Tests have been performed on needle-plane configuration samples in solids and gels. A physical model has been formulated through an adaptation of an established theory for solids in which electrical tree inception is related to damage-producing injection currents. The voltage rise time appeared to be the most important parameter influencing the tree inception in the gel, while in the solid material the frequency is more relevant. The analysis leads to the conclusion that tree inception in gels is due to a single highenergy event, in contrast to what is commonly known for solids where damage accumulation takes place. A tree inception model is proposed for the gel, in which initiation is driven by a pressure wave generated by the electric field and the space charge injected into the sample. The model fits the experimental data and may be used to predict the tree initiation for different waveforms and voltage values.

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Section: General Features Of Electrical Tree Formationmentioning

confidence: 99%

Analysis of electrical tree inception in silicone gels

Mancinelli

Cavallini

Dodd

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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“…It both increases the probability of breakdown and decreases the breakdown strength. Figure 2 [5,6] shows that water treeing leads to a reduction in breakdown strength (as well as changes in the dielectric and viscoelastic response [4]). Degradation due to water trees typically leads, after a period of months to years, to electrical treeing.…”

Section: Ageingmentioning

confidence: 99%

“…Prediction is further complicated by the stochastic nature of breakdown (e.g. [3,33]) giving rise to a wide distribution of times to failure amongst a set of identically stressed insulation systems. The objectives of the European ARTEMIS project [35,36] were to develop techniques to assess the state of ageing of cable materials under combined thermoelectrical stresses, and to develop a diagnosis system to predict their remaining life time.…”

Section: Ageingmentioning

confidence: 99%

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Fothergill

2007

2007 IEEE International Conference on Solid Dielectrics

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Three areas of considerable progress are identified in the area of polymeric insulation since the mid 1990s (i.e. since the inception of the Eric O. Forster Memorial Lectures): the understanding of ageing, the measurement of space charge, and the development of nanodielectrics. The paper proposes a typology to distinguish and define electrical ageing, degradation and breakdown. With reference to the principal theories of thermo-ageing, it is concluded that there is little direct evidence for ageing even though it is likely to exist, at least above a critical field. The capability to measure space charge has improved considerably and this shows considerable potential as a diagnostic tool. Space charge behaviour is extremely difficult to analyse and general predictions may be impossible in practice. It is, however, necessary to control space charge accumulation in HVDC systems. Nanodielectrics continue to offer promise and understanding is improving in this area, particularly in the development of models of interaction zones around nanoparticles.

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“…These can lead to a reduction in life, which in turn can lower the reliability of electrical power systems. Therefore, a lot of research effort, activities and publications are directed towards a better understanding of degradation phenomena [1] [2], the creation of tools for insulation diagnosis [3] [4] and the establishment of remaining life estimation techniques [5] [6].…”

Section: Introductionmentioning

confidence: 99%