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According to our former investigation on space charge properties of two layers of oil-impregnated-paper and oil, the interface charge between oil and paper showed different properties with Maxwell-Wagner theory in which macroscopic conductivity and permittivity were only taken into consideration. It is assumed that the charge barrier existing at interface was responsible for the interfacial charge...
Polyethylene (PE) and oil impregnated paper are widely used as insulation materials in high voltage power equipment however, at high voltages the space charge inside the insulating material can distort the electric field distribution and thus greatly influence aging and degradation. Moreover, there is usually a temperature gradient across the insulation when the equipment is in service, and this can...
The temperature gradient, which occurs when HVDC cable is put into operation, can lead to space charge accumulation and distort the electrical field distribution in the insulation evidently. The addition of nano filler can dimish space charges in low density polyethylene (LDPE), therefore, the electrical strength of cable can be upgraded by replacing conventional insulation with nano composites. This...
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