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Polymer nanocomposites can change the density and/or energy of traps, suppress the accumulation of space charges, and enhance dielectric breakdown strength. It is of interest to reveal the influencing mechanism of trap properties on the dielectric breakdown of polymer nanocomposites. Results of thermally stimulated depolarization current and surface potential decay were reviewed, showing that incorporating...
The presence of space charge in solid dielectric materials can lead to electric field distortion and affect the electrical performance. Local electric field enhancement in the solid dielectric materials may greatly contribute to the early aging and even electric breakdown. The above effect has been highlighted in many research papers under HVDC conditions and space charge has been considered as the...
In the present paper, trapping parameters of normal and thermally aged low-density polyethylene (LDPE) samples were estimated using the improved charge dynamic model. The results show that, after long-term thermal ageing process, the injection barrier of both electrons and holes is lowered, the overall trap depth is shallower and electron trap density becomes much greater. The latter may indicate...
Space charge formation will cause electric field enhancement at certain location in the polymeric materials, especially under HVDC insulation condition. In our previous works, a model has been developed which is suitable for analysing the space charge data from depolarization test to calculate the material trapping parameters. In the present paper, two cross-linked polyethylene (XLPE) cables, taken...
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