接地装置动态冲击电阻影响因素的试验研究

Experimental Study on Influence Factors of Dynamic Impulse Resistance of Grounding Devices

针对接地装置冲击散流过程中的动态冲击电阻及其影响因素展开研究,采用同一时刻的冲击电压与冲击电流的比值来模拟接地装置的动态冲击电阻,通过模拟试验得到了土壤含水量、含盐量以及土壤种类等关键参数对动态冲击电阻的影响规律。结果表明:随含水量、含盐量的增加,动态冲击电阻的起始值减小、最小值增大、衰减时间减小;黏土与沙土相比,动态冲击电阻的起始值较小、最小值较大、衰减时间较小。

This research focuses on the dynamic impulse resistance of the grounding device and its influence factors.The dynamic impulse resistance of grounding device is calculated by the ratio of the sampled instantaneous impulse voltage and current.Influences of soil＇s water content,salt content and type on the dynamic impulse resistance are obtained by environment controlled experiment.The results show that the initial value and fall time of dynamic impulse resistance decreases,while the minimum value increase with the soil＇s water and salt content.Comparing with sandy soil,the initial value and fall time of dynamic impulse resistance of normal soil is smaller,while the minimum value is larger.