Direct optical observation of polyethylene microstructures under field and temperature conditions, before any degradation

Bertin, Christian; Guastavino, J.; Briot, M.; Campus, A.; Druot, P.

doi:10.1109/icsd.1998.709276

Cited by 5 publications

(2 citation statements)

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“…We would expect this also to happen in polyethylene when the damage filaments are formed on the lamella surfaces. Although no evidence for such behavior has been presented in the EL emission it is interesting to note that long time scale structural variations has been observed during the tree initiation period [20]. In general we believe that our model can be applied to Polyethylene as well as to epoxy resins, as long as due cognizance is taken of the differences in chemistry involved.…”

Section: Comparison With Polyethylenementioning

confidence: 82%

Model for electrical tree initiation in epoxy resin

Dissado

2005

IEEE Trans. Dielect. Electr. Insul.

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A model for electrical tree initiation in epoxy resins is presented in which the process is driven by the generation of new charge traps as a result of energy transferred to the polymer via charge recombination processes. The electroluminescence intensity expected from the model is computed and shown to be in agreement with the experimental data. In particular it is shown how the initial emission due to recombination can change to an emission arising from impact excitation in a natural way when the trap density reaches a level sufficient for the high electric field of the tree initiation region to connect shallow traps to form conducting filamentary paths in the form of percolation clusters. This result allows the electroluminescence behavior to be correlated with the observed onset of filamentary damage. The model is also shown to be able to explain the decrease in emission intensity observed at the time of transition between the two mechanisms for luminescence. England twice he settled in at ChelseaCollege in 1977 to carry out research into dielectrics. His interest in breakdown and associated topics started with a consultancy with STL in 1981. Since then he has published many papers and one book, together with John Fothergill, in this area. In 1995 he moved to The University of Leicester, and was promoted to Professor in 1998. He has been a Visiting Professor at The University Pierre and Marie Curie in Paris, Paul Sabatier University in Toulouse, and Nagoya University, and has given numerous invited lectures, the most recent of which was the Whitehead lecture at IEEE CEIDP 2002 in Cancun, Mexico. Currently he is an Associate Editor of IEEE Transactions DEI, co-chair of the Multifactor Aging Committee of DEIS and a member of DEIS Administrative Committee.

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