垂直接地体的冲击电阻与冲击系数

The Impulse Resistance and Coefficient of Vertical Grounding Rod

给出一种计算垂直接地体冲击电阻与冲击系数的有效算法 ,这种算法能够较为合理地考虑土壤的放电效应对冲击电阻与冲击系数的影响。在围绕接地体周围的放电区域 ,一种非线性特性被建议用于表示土壤中电流密度与电场之间的关系 ,通过对放电区域内外电场的积分 ,接地体上的电位能够被计算出来 ,从而求得冲击电阻 ,相应地 ,冲击系数也能按冲击电阻加以定义。为了校验本算法的有效性 。

An effective method is presented in this paper for calculating the impulse resistance and coefficient of vertical grounding rod.The method can take account of the soil discharge effect on the impulse resistance and coefficient in a reasonsble manner.In the discharge donain around a vertical grounding rod,a nonlinear characteristic is proposed to indicate the relationship between current density and electric field.The potential on the vertical grounding rod is evaluated by the integration of electric fields inside and outside the discharge donain.Then,the impulse resistance can be obtained from the potential.Relevantly,the impulse coefficient can also be defined in terms of the impulse resistance.To confirm the validity of the presented method,a comparison of calculated results has been made with measured results and a better agreement appears between them.