导电混凝土接地棒接地降阻特性研究

Study of resistance reducing characteristics of conducting concrete grounding rods

为了研究混凝土接地棒在通入工频电流和冲击电流时的接地降阻性能.分析了混凝土接地棒降低工频接地电阻和冲击接地电阻的原理,以及工频电流和冲击电流下的接地体间的屏蔽效应.分别给出了混凝土接地棒工频接地电阻和冲击接地电阻的测量方法及减小测量误差的措施.采用上述方法对混凝土接地棒进行试验验证:得到良好的工频接地和冲击接地降阻的性能,使接地体通入冲击电流时有更强屏蔽作用.

To study grounding resistance reducing characteristics of conducting concrete grounding rods under the influence of power frequency current and impulse current, the principle of reducing the power- frequency grounding resistance and impulse grounding resistance of the concrete ground rod is analyzed, and the shielding effects between grounding bodies under the influence of power frequency current or im- pulse current are studied. The measuring methods of impulse grounding resistance and the power-fre- quency grounding resistance of the concrete rods and the measures of reducing the measurement errors are presented respectively. Finally , based on the above methods, we test the concrete rods, and get the conclusions that they have good performance in reducing the power frequency grounding resistance and impulse grounding resistance and that the shielding effect is stronger when the grounding body is under the influence of impact current.