摘要
根据土壤结构,研究了土壤的多孔介质电气模型,并研究了冲击电流作用下,土壤特性参数的频变规律,分析得出土壤频变特性对改善接地装置冲击散流效率,降低暂态冲击接地阻抗具有重要意义。研究了接地装置冲击过程中土壤火花放电现象的动态物理过程和土壤火花放电的检测手段及其对接地装置的影响。最后进行了土壤火花放电现象的试验研究,得出随着土壤含水量的增加,土壤火花放电的起始冲击击穿场强逐渐降低;在0℃以上,温度越高,越容易发生土壤的火花放电现象。
According to the soil constitution,the paper studies the soil electrical model of porous medium and the frequency dependent characteristic of soil parameters.Based on which the paper points out that the frequency dependent characteristic is of important significance for improving the current divergence efficiency of grounding device and reducing the transient impulse grounding impedance.Moreover,the paper also studies the dynamic physical processes and testing methods of the soil with spark discharge phenomenon in the impulse process of the grounding devices as well as its impact on the grounding device.Finally the experimental study on the spark discharge phenomenon is done.The results show that the initial impulse breakdown field density of the soil spark discharge will decrease with the increase of soil moisture content; and above 0℃,the soil spark discharge phenomenon is more likely to happen if the temperature is higher.
出处
《陕西电力》
2014年第10期63-66,71,共5页
Shanxi Electric Power
关键词
土壤结构
频变特性
暂态接地阻抗
火花放电
起始冲击击穿场强
soil constitution
frequency dependent characteristic
transient impulse grounding impedance
spark discharge
starting impulse breakdown field density
