Understanding electrical trees in solids: from experiment to theory

Dissado, L.A.

doi:10.1109/tdei.2002.1024425

Cited by 278 publications

(104 citation statements)

References 47 publications

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“…Branched filamentary electrical tree structures are observed in the elastomeric region (see Figure 5c and Figure 7 (d-f) that are similar in form to those found in other solid insulating dielectrics [13,14]. Bubble cavities are not formed because of the low LMW liquid fraction in this region.…”

Section: Electrical Treeing Testssupporting

confidence: 67%

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Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Salvatierra

Kovalevski

Quiña

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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Section: Electrical Treeing Testssupporting

confidence: 67%

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26]), including silicone rubber [27]. The equivalent breakdown phenomena in liquids i.e.…”

Section: Electrical Treeing Testsmentioning

confidence: 99%

Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Salvatierra

Kovalevski

Quiña

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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“…However in order to create reliable monitoring system based on PD pattern recognition it is necessary to improve our understanding on the physical processes governing the PD activity and the way PD patterns evolve with material degradation. Deterministic models of electrical tree growth have been quite successful in producing branched structures and have provided an insight into the physical processes governing electrical tree inception and propagation [3]. A deterministic approach was adopted in [4] for modelling partial discharges in electrical trees and the model was successful in reproducing the spatial extent of the partial discharge activity and the PD apparent charge magnitudes.…”

Section: Introductionmentioning

confidence: 99%

Partial discharge patterns in conducting and non-conducting electrical trees

Dodd

Chalashkanov

Fothergill

2010

2010 10th IEEE International Conference on Solid Dielectrics

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Abstract-Previous observations on electrical tree growth in epoxy resins has shown that different types of tree growth structure, electrically conducting and non-conducting, can occur dependent on the state, glassy or flexible, of the epoxy resin. In this current study, the partial discharge characteristics were characterized experimentally at a temperature of 20C within two different epoxy resins systems having glass transition temperatures of 0C and 50C. The partial discharge activity (determined from apparent charge measurements) was characterized in terms of ~q~n patterns using statistical tools. The aim was to compare the apparent charge measurements obtained from conducting and non-conducting electrical tree structures with computer simulations of the partial discharge activity in both conducting and non-conducting electrical trees. The results show that there is a significant relationship between the local extent of the partial discharge phenomena, as determined by the conductivity of the tree channels, and the apparent charge, as shown by the experimental and simulated partial discharge patterns. The implications of this work for partial discharge detection as well as for condition monitoring in real insulating systems are discussed.

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“…The electrical trees can be initiated from various defects in cable insulation, such as impurity or local high electric field due to the protuberance of semi-conducting shielded layer. It is found that the factors responsible for initiating and propagating of electrical trees in polyolefin cable insulation depend upon not only the cable manufacturing technique, 12 October 2009. the frequency of applying voltage, but also the impurity content, the internal residual stress and physical morphology of insulation material [1][2][3][4][5][6][7][8]. With the increasing applications of 220 kV and above, the insulation of XLPE cables becomes thicker and the harmonic problems in power system could not be neglected in recent years.…”

Section: Introductionmentioning

confidence: 99%

Investigations of electrical trees in the inner layer of XLPE cable insulation using computer-aided image recording monitoring

Xie

Zheng

2010

IEEE Trans. Dielect. Electr. Insul.

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Using a computer-aided image recording monitoring system, extensive measurements have been performed in the inner layer of 66 kV cross-linked polyethylene (XLPE) cables. It has been found that there are three kinds of electrical trees in the samples, the branch-like tree, the bush-like tree and the mixed tree that is a mixture of the above two kinds. When the applied voltage frequency is less than or equal to 250 Hz, only the mixed tree appears in XLPE samples, when the frequency is greater than or equal to 500 Hz, only the dense branch-like tree develops, both of which are attributed to the coexistence of non-uniform crystallization and internal residual stress in semicrystalline XLPE cables during the process of manufacturing. Through the fractal analyses of these electrical trees, it has been found that both the propagation and structure characteristics can be described by fractal dimension directly or indirectly. It is suggested that the propagation and structural characteristics of electrical trees are closely related to the morphology and the residual stress in material at low frequency, i.e., the propagation characteristics of electrical trees depends upon not only the boundaries between big spherulites and amorphous region, but also the impurity, micropore concentration and the relative position of needle electrode tip with respect to spherulites or amorphous region in the low frequency range. However, at high frequency, it has nothing to do with the morphology of material. It is suggested that the injection and extraction process of charge from and to dielectrics via the needle electrode are more intense at high frequency than in low frequency. Thus, it can form relatively uniform dielectric weak region in front of needle electrode, which leads to similar initiation and propagation characteristics of electrical trees at high frequency.

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Understanding electrical trees in solids: from experiment to theory

Cited by 278 publications

References 47 publications

Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Self-healing during electrical treeing: A feature of the two-phase liquid-solid nature of silicone gels

Partial discharge patterns in conducting and non-conducting electrical trees

Investigations of electrical trees in the inner layer of XLPE cable insulation using computer-aided image recording monitoring

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