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Gas-insulated metal-enclosed switchgear (GIS) is an important switching equipment in modern power system. Since GIS equipment has a fully enclosed structure, once failure occurs, it will always be followed by a huge economic loss and an adverse social impact. On-site lightning impulse (LI) test is very important to improve the quality of the GIS equipment since it is particularly sensitive to some...
A new method was introduced to evaluate and analyze synergistic effect including negative synergistic effect of SF6/N2 gas mixtures breakdown voltage. This method provides an intuitional comparison among different degree of synergistic effect through a simple equation of the normalization coefficient h. The disadvantages of traditional method, which fails to evaluate negative synergistic effect and...
In recent years, SF6/N2 gas mixture gains much popularity as an alternative insulating medium of pure SF6 gas among gas-insulated equipment because of the greenhouse effect and poor economy effectiveness of the latter. This paper investigated the breakdown characteristics of SF6/N2 gas mixture with low SF6 mixing ratio in slightly non-uniform electric field which is similar to the gas-insulated metal-enclosed...
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