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Multi-walled carbon nanotube/epoxy resin (MWCNT/EP) composites with filler contents from 0.03wt% to 0.5wt.% and two different aspect ratios are prepared by solution blended process. Carbon nanotubes are dispersed by sonication and high speed shear force. The impact of aspect ratio on electric and thermal conductivity of nanocomposites has been studied. Experiment results illustrate that percolation...
Carbon nanotube (CNT) was modified with TDI molecules in order to improve the dispersion of carbon nanotube fillers in organic phase. Semi-conductive layer prepared by epoxy matrix with 0.045 phr CNT was second-time bonded to the neat epoxy for preparing double-layer composite. Broadband dielectric spectroscopy was performed to measure the complex permittivity of neat epoxy, epoxy — CNT/epoxy double-layer...
In order to study the effect of the glass transition temperature (Tg) on space charge behavior of epoxy resin under polarity reversal voltage, the epoxy resin samples with low Tg were casted in vacuum condition. The dielectric spectra of the samples were measured over the frequency range of 10−1 to 106 Hz at different temperatures. At different temperatures the negative poling field of −30 kV/mm was...
There are more and more converter transformers, bushings, smoothing reactors use epoxy resin or epoxy/insulating paper composite materials as the main insulating medium, in the UHVDC transmission projects. In practice, there are many interfaces between epoxy and insulating paper exist in paper/paper insulation system. Compared with epoxy resin, there are a lot of traps in paper. The structure of the...
Epoxy resin has been widely used in dry-type insulation application such as DC dry-type bushings. In practice, DC dry-type bushings work not only under DC voltage, but also under multiple harmonics with 50Hz fundamental frequency. This study focuses on the effects of space charge behavior of epoxy resin on real voltage of DC dry-type bushings. By using Fourier decomposition, the real voltage of DC...
Epoxy resin has been widely used in dry-type insulation application, such as dry-type bushings. This study focuwes on the epoxy formulation system effect on the dielectric properties of epoxy resin. With methyl hexahydrophthalic anhydride as curing agent, we made the specimens which were mixed epoxy resin and flexible epoxy resin in different weight. Because of the proportion of flexible epoxy resin,...
Epoxy resin has been widely used in dry-type insulation application, such as dry-type bushings. This study focuses on the temperature effect on the space charge characteristics and dielectric properties of epoxy resin. The space charge distribution measurement has been performed at different electric fields and temperatures by the PEA method, ranging from 2kV/mm to 60kV/mm at 291K, 313K and 343K respectively...
In order to study the interfacial effect on space charge distribution in HVDC bushings which impregnated with epoxy resin, samples just like epoxy-impregnated paper-epoxy were prepared by vacuum casting process. Space charge characteristics have been studied by the method of pulsed electroacoustic (PEA) technique at different electric fields and temperatures, including charge polarity, charge amount,...
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