单相间歇性弧光接地过电压机理的研究(二)

以首次波过电压特征足以表明单相接地过电压的一般特性,而不必再分析重燃这一基本观点为基础,应用叠加原理,通过根特征及集中参数模型来分析首次波的性态。对δ值、中性点电阻接地、中性点经消弧线圈接地的理论分析,使统计结果更为完善。分析指出:增大δ值是改善过电压的好方法;中性点经高阻接地存在许多严重缺陷,一般不适于井下电网。消弧线圈结合较大的δ值可能达到既降低过电压,又减小接地电流的效果。

THE RESEARCH OF THE MECHANISM OF SINGLE PHASE INTERMI?TTENT ARC EARTHING OVERVOLTAGE(SECTION 2)

On the basis of the basle viewpoint of that the character of the first wave overvoltage is sufficient to indicate the general character of the single phase earthing overtage and does not need to analyze the rearcing . The behaviour of the first wave is analyzed through the root character and the model of conceutrated parameter. The theoretical analysis of the value, the neutral-point resistance earthing and neutral-point earthing ia the arc suppressing coil makes the statistical result more perfect. The analysis points out that increasing value is the good way to improve the overvoltage.There are many serious shortcomings in neutral-point earthing via hish resistance, Generally it is not suitable for the underground electrical network. Are suppressing coil in combination with greater value can attain the effect of both decreasing the overvoltage and reducing the earthing current.