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Short-term DC progressive-stress tests on 200 micron thick specimens of a commercial XLPE and its silica nanocomposite intended for DC use have shown that the DC nanocomposite has a considerably higher breakdown strength than the AC XLPE. However, constant-stress tests have shown that both the nanocomposite and the unfilled XLPE have similar lifetimes at medium fields of 125–175 kV/mm. There is also...
Polymers such as polyimide (PI) are easy to initiate surface flashover phenomenon in space environment. The surface flashover phenomenon in an extremely low DC electric field of PI material is a key factor restricting the spacecraft power system insulation strength, which is also a bottleneck problem for developing the spacecraft with high voltage and high power. In order to reveal the charge injection...
In recent years, many efforts have been done to prevent circuit board used in space environment from deep dielectric charging, which is a serious threat to operational spacecraft. In this paper, in order to obtain a kind of dielectric material that can release harmful charges rapidly under high electric field, a kind of semi-conductive metallic oxide granules of different diameters ranges from nano...
To eliminate local corona and reduce minimal discharge distance of transmission lines, this paper analyzed expanding diameter insulation jacket for 110kV transmission line. The minimal discharge distance and its relationship with the diameter of semi-conducting and expanding diameter was calculated theoretically, finding the best size of expanding diameter and general standard of expanding diameter...
It is well known that the solid materials flashover phenomenon is very complicated and influenced by many factors, such as surface conditions, electrodes and traps, etc. In this paper, dc flashover experiments of polyimide (PI) and PI/ZnO nano-composite are studied in vacuum to reveal the surface flashover mechanism. The trap levels and space charge distributions were obtained by thermally stimulated...
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