In practice,when designing the insulation structure of high voltage equipment,notonly the breakdown in the gas,but also the discharge along the gas-solid interfaceshould be considered. If the voltage along the insulator surface rises to a certainlevel,a “...[继续阅读]

    Table 9.3 shows the critical field (E/N)lim values of pure c-C4F8,c-C4F8/CO2,c-C4F8/CF4,c-C4F8/N2 and c-C4F8/N2O at the mixing ratios of 100/0,90/10,75/25,60/40 and 50/50. The (E/N)lim values for c-C4F8/N2O and c-C4F8/N2 arelarger than those for the other...[继续阅读]

    In the weakly nonuniform electric fields,covering the electrode surface of high fieldstrength with an insulating layer of solid paper can also improve the breakdownvoltage,and the effect is so significant. However,covering the electrode with aninsulating ...[继续阅读]

    Abstract The discharge characteristics and insulation performance of severalcurrent potential alternatives to SF6 are described in this chapter. Theoreticalcalculation and experimental research are adopted to conduct experimental researchand computational...[继续阅读]

    In slightly non-uniform electric fields,as the distance of the electric field increases,the growth of breakdown voltage becomes slow gradually,after the saturationphenomenon occurs,as shown in Fig. 7.7. Therefore,to improve the withstandvoltage,more empha...[继续阅读]

    Abstract The physicochemical properties and the discharge characteristics of SF6gas,and also the gap breakdown characteristics of SF6 under uniform,slightlynon-uniform and extremely non-uniform electric fields are described in this chapterwhere the effect...[继续阅读]

    In the uniform electric field,the insulation performance of SF6 gas is excellent.Increasing the gas gap d and gas pressure p can significantly improve the insulationcapacity of the gap. In a certain range of values of p,the discharge characteristics ofSF6...[继续阅读]

    2.3.3.1 Collision Cross SectionFor collisions between two rigid balls,when the distance between them is less thanor equal to their radius r1+r2,there will be a collision. Taking the respectivedirections of movement into account,generally π(r1+r2)2 is used...[继续阅读]

    In the uniform field,as two electrodes have the exactly symmetry structure,there isno polarity effect,which means the breakdown voltage will be the same,no matterwhether positive or negative voltage is applied.In non-uniform and extreme non-uniform fields...[继续阅读]

    There are generally two study methods to comprehend and predict the insulationcharacteristics of a gas: ① direct breakdown experiments; and ② study of thedischarge mechanism at the electron avalanche stage (studying the pre-breakdownprocess). Direct break...[继续阅读]