Corona stabilization at negative impulse stress in SF/sub 6/ and SF/sub 6/-N/sub 2/-mixtures

W. Pfeiffer, H. Welke, V. Zimmer
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Abstract

Measurements have been made to evaluate the characteristics of impulse corona at negative impulse stress. It is shown that for the parameters investigated the corona onset voltage is a linear function of the degree of homogeneity of the electrode arrangement for different pressures and mixture ratios. It is also shown that the corona onset voltage is a linear function of the pressure for different gap distances and mixture ratios for the parameters investigated. The breakdown voltage at impulse stress has been measured for a constant formative time lag, for different gap distances, for various degrees of homogeneity ( eta =E/sub mean//E/sub max/ was varied from 0.76 to 0.04), and for different SF/sub 6/-N/sub 2/ mixtures. Measurements of the breakdown voltage have shown that the corona stabilizing effect exists up to a mixture ratio of 10% SF/sub 6/ to N/sub 2/. It has been found that a slightly inhomogeneous electrode arrangement ( eta =0.26) has a lower dielectric strength than a strongly inhomogeneous electrode arrangement ( eta =0.04).<>
SF/sub - 6/和SF/sub - 6/-N/sub - 2/-混合物在负脉冲应力下的电晕稳定
对负脉冲应力下脉冲电晕的特性进行了测量。结果表明,对于所研究的参数,在不同压力和混合比下,电晕起始电压是电极排列均匀度的线性函数。研究还表明,在不同间隙距离和不同混合比例下,电晕起始电压是压力的线性函数。在一定的形成滞后、不同的间隙距离、不同程度的均匀性(eta =E/sub mean//E/sub max/从0.76变化到0.04)以及不同的SF/sub 6/-N/sub 2/混合物下,脉冲应力击穿电压被测量。击穿电压的测量表明,直到10%的SF/sub - 6/与N/sub - 2/混合时,电晕稳定效应仍然存在。我们发现,稍微不均匀的电极排列(eta =0.26)比强烈不均匀的电极排列(eta =0.04)具有更低的介电强度
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