One effective way to enforce the electric strength of SF6 is to increase the pressure(with attention not to over-increase the pressure in case of liquefaction). However,similar to air,SF6 possesses the characteristic that the breakdown voltage willincreas...[继续阅读]

    Perfluoropropane (C3F8) gas is a kind of perfluorinated carbide (PFC),generallyused as a refrigerant or etching gas,used in the microelectronics industry andmedicine. Usually C3F8 is a colorless,low toxicity,non-flammable gas which hasvery good chemical s...[继续阅读]

    When the voltage is not enough to break down in a non-uniform electric field,theionization phenomenon may be able to develop in the vicinity of the large curvatureelectrodes with the greatest strength electric field. The accumulation of the spacecharge br...[继续阅读]

    Electrode materials,especially the state of the electrode surface,have a greatinfluence on the process of emitting electrons from the cathode surface relying onradiation and positive ion bombardment. Thus the impact of the electrode on gasbreakdown potent...[继续阅读]

    8.3.2.1 Uniform Electric Field1. SST methodThe Dengming Xiao research group measured SF6/CO2 gas mixtures by the SSTmethod over the range 26.3≤E/p≤94.0 kV/mm·MPa,obtaining the change lawof α/p, η/p,&xf3bb;/p and E/p values. The purity of CO2 gas is 99.95%...[继续阅读]

    Chapter 9 and this section have proven the high potential of CF3I and its gasmixtures to substitute for SF6 when applied in electric power apparatus,whichrequires much more basic research and study. In different uniformity of electricfields as well as und...[继续阅读]

    Gas insulation has many features which other insulation mediums could not match.The gas will not encounter the aging problem and its life is almost unlimited. Gasinsulated devices are small,not affected from the external environment,safe,reliable,and have...[继续阅读]

    Actually,only the electric field between two parallel plate electrodes with edgeeffects eliminated can be called uniform. The gap distances of a uniform electricfield are rarely large in engineering. Because of the large gap distances,the requiredsizes of...[继续阅读]

    Observing from the above calculation and analysis results,the breakdown voltageof gas mixtures is not only related to the value of pd,but to the gas cross section data(elastic scattering section). In other words,for a gas with a given mixture ratio,acerta...[继续阅读]

    Using high vacuum is similar to raising up pressure; it also weakens the ionizationprocess of the gas between electrodes. Because although the electron free pathbecomes large,there are no longer available gas molecules for collision in the gap;thus,the io...[继续阅读]