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Graphene oxide, a kind of nano-fillers with desirable thermal and electrical properties, could be added to epoxy resin and achieve satisfactory dispersion status due to its hydrophilicity, which lend great help to the preparation of samples. Graphene oxide could be mixed with water since its functional groups, O-H is in harmony with water's functional groups. Furthermore, epoxy resin, flexibilizer,...
Generally, UHV converter transformer bushing cores use epoxy resin and insulating paper composite materials as the main insulating dielectric. It is necessary to study the space charge behavior of epoxy resin/insulating paper composites at high temperature and field strength. According to the insulation structure of dry-type bushing core, two epoxy/paper/epoxy three layers Composite samples with different...
Epoxy resin impregnated crepe paper (ERICP) composites is the main insulating material of the ultra-high voltage direct current (UHVDC) dry bushing. The moisture in the environment may intrude into the ERICP composites in the manufacturing process of the bushing, which would affect the quality of the bushing. In order to investigate the diffusion process of moisture in the ERICP composites during...
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...
The absorbed moisture of epoxy resins (ER) and epoxy resin impregnated paper (ERIP) composites have a great influence on the insulation of ultra-high voltage direct current (UHVDC) bushings. The ER and ERIP samples were prepared according to a certain formulation. The moisture absorption behaviors of ER and ERIP in deionized water were determined by measuring periodically the change of weight. Through...
The effect of electrode material on the space charge behavior in epoxy resin has been investigated using the pulsed electro-acoustic (PEA) technique. Common metallic electrode materials, i.e. gold, silver and copper, were selected and sputter-coated on the specimens, and the space charge dynamics after the application of various electric fields were monitored at 293 K and 313 K. The space charge accumulation...
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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