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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...
In this paper, the design method of dc capacitor bushing core has been studied. According to the derived epoxy/paper composite life model, the bushing core design methods are proposed based on the life of materials, which can make a more reasonable electric field distribution within bushing core. By adjusting the size of plates, the insulation life of innermost and outermost of the bushing core is...
EH-4, belonging to device of mixed sources, is a frequency domain electromagnetic sounding system which combines man-made field source and natural field source. The special man-made electromagnetic wave emitter and the new type low noise magnetic unit are applied to combine man-made field source and natural field source, which makes it possible to survey part of man-made filed as well as natural field...
Disasters of spontaneous combustion at coalfields are severe in China. The premise of effective control against the disasters is investigations taken for combustion location and scope for spontaneous combustion at coalfields so as to provide scientific basis for flame extinguishment design and construction of coalfields. Working principles, construction methods and detection effects of high resolution...
In the compound insulation which is comprised of cable accessory (e.g. terminal or sheath of cable), interface between different dielectrics or electrode and dielectric is often claimed to be the weakest points due to space charge accumulation and then the increase of adjacent electrical field. Furthermore, the higher temperature of cable conductor caused by Joule heating leads to conductivity gradient...
An interval percolation model was put forward to describe the ceramic-metal composite, in which the contact resistance of ceramic powder was reduced so that the bulk property of the ceramic could be recovered. Monte-Carlo simulation confirmed that the bulk property can be surely recovered in a cubic network if the fraction of conductive sites is in the range of 0.101 to 0.311. Experimental works also...
A two-component composite material is simulated by 8times8times8 cubic cells, containing a spherical inclusion in each of them. A series of produced random numbers are regarded as the radii of these spherical inclusions to simulate the size distribution of inclusions. The finite element method (FEM) is applied to solve the potential distribution and the effective permittivity is calculated by the...
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