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Epoxy resin as a typical electrical insulation material has been widely applied in the power equipment. However, the electrical properties of epoxy resin are strongly affected by the surface charge accumulation. One way to solve the surface charge accumulation may be to use the nonlinear resistive field grading nanocomposites. In this paper, we aim to study the effect of ZnO nanoparticles on the surface...
This paper presents the fundamental characteristics of the electronic structures of silicone rubber (uncured SR) and cured (crosslinked) SR molecules. Localized states and trapping sites are evaluated by the molecular orbitals (MOs) and the density of state (DOS). The introduction of vinyl groups slightly changes the energy level distribution and introduces the electron-localized states (shallow trapping...
This work studies the space charge mechanisms of PE and PTFE by involving the combination of electronic structures and charge transfer processes at the interfaces of electrode/dielectrics. Experimentally, significant positive charge packets were observed in LDPE when subjected to a high electric stress. However, slight charge accumulations (mainly homo-charges) were observed inside polytetrafluoroethylene...
The characteristics of raw material powders, such as the purity and average particle size, have a major impact on the microstructure and properties of the CaCu3Ti4O12 ceramics. The properties of CaCu3Ti4O12 ceramics fabricated with nano-size powders (∼30 nm) are compared with those of the samples with submicron powders (0.1∼0.3 μm). It is found that, the samples fabricated with nano-size powders have...
In the paper, the influences of trap levels on both DC and impulse surface flashover voltage of semi-crystalline cross-linked polyethylene (XLPE) in vacuum were investigated. With different heat-treatment, the electrical properties and trap distribution of samples were studied. It is proposed that the trap levels are changed by heat treatment leading to the improvement of surface flashover properties...
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