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The research interests of Professor Dissado are currently focussed on space charge evolution in insulating polymers, their thermo-electrical ageing, and the mechanism of prebreakdown processes such as electrical trees. Recent work on electrical trees has concentrated on the initiation process in epoxy resins under an EPSRC ROPA award. It has been shown that the electroluminescence intensity observed during tree initiation in these materials relates to an initiation process in which recombination between charges of opposite polarity first generate new trap states. When the trap density is high enough the shallow traps form percolation clusters in the applied electric field enabling electrons to be accelerated to an energy sufficient to cause further changes and light emission through the excitation of molecules along their path.
Eventually the damage accumulates to form gas filled tubules and the tree is initiated. The figures below show experiment and simulation of the emission intensity. Professor Dissado was part of the HVDC EU framework 5 programme, helping to produce a computer programme to simulate space charge evolution in DC cable. Related work on the decay of space charge showed an early stage dominated by injection-neutralization and a later stage governed by de-trapping rates.
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2024 IEEE 5th International Conference on Dielectrics (ICD)pp.1-4, (2024)
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#Papers: 328
#Citation: 10601
H-Index: 50
G-Index: 90
Sociability: 6
Diversity: 3
Activity: 5
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