伸长接地体冲击接地电阻计算

Computation of Impulse Grounding Resistance of Extended Grounding Electrode

为较准确解决伸长接地体冲击接地电阻的计算问题 ,采用非线性差分电路模型 ,导出了一种考虑土壤火花放电特性的伸长接地体冲击接地电阻的计算方法。利用该法求得了伸长接地体冲击接地电阻与雷电流幅值及接地体长度的一组关系 ,计算结果与国家电力行业标准及现场试验结果接近 。

In order to compute the impulse grounding resistance of extended grounding electrode accurately, using a nonlinear differential circuit model, this paper introduces a method for computing the impulse grounding resistance based on the spark discharge characteristic of the earth. Using this method, the relation curves of impulse grounding resistance with the current peak value and the electrode length are obtained. Then the result are compared with the national standard, real model testing result and simulated testing result, it shows that the proposed method can be used in practice.