水平接地体的雷电冲击特性研究

为研究雷电流经水平接地体时的冲击特性,采用电磁暂态计算程序(ATP-EMTP)仿真法对水平接地体在脉冲电流下的冲击特性进行分析,得出接地体的几何尺寸和土壤电阻率对冲击接地特性的影响。探讨了冲击电流和接地体电位达到峰值的时间差与接地体尺寸、土壤电阻率的关系。仿真结果表明:冲击接地电阻的大小随接地体尺寸的增加而减小,趋势渐缓,直至稳定;冲击接地电阻大小与土壤电阻率成正比。

Research of Lightning Impulse Characteristics of Horizontal Grounding Electrode

To study the lightning impulse characteristics of grounding electrode,the horizontal earth-termination electrode's impulse characteristics under impulse current is analyzed by use of ATP-EMTP method.The relationships that the impulse characteristic relates to the geometry dimension of grounding electrode and the soil resistivity are given out.The simulation results show: transient grounding resistance(TGR) will increase when the dimension of grounding electrodes increase,but the tendency becomes gradual,and the TGR will become a constant when the length of the electrodes increase to a certain value.The TGR is linearly proportional to the value of the soil resistivity.Simulation results show that impulses grounding resistence decreases with the increase of geometry dimension of electrode and the decrease of soil resistivity.