连续雷电冲击下典型杆塔接地装置冲击接地电阻分析  

Impulse grounding resistance analysis of typical tower grounding device under continuous lightning impulse

作　　者：刘宇彬 雷川丽 唐利松 冯子阳 周力行[2] LIU Yubin;LEI Chuanli;TANG Lisong;FENG Ziyang;ZHOU Lixing(The Research of Hunan Province Electric Power Design Limited,Changsha 410000,China;School of Electrical&information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]湖南经研电力设计有限公司,湖南长沙410000 [2]长沙理工大学电气与信息工程学院,湖南长沙410114

出　　处：《电力科学与技术学报》2023年第1期243-248,共6页Journal of Electric Power Science And Technology

基　　金：湖南省战略性新兴产业科技攻关与重大科技成果转化项目(2018GK4002)。

摘　　要：为分析连续雷电冲击下杆塔接地装置的冲击特性,对不同土壤、材料及形状的典型接地体进行连续冲击试验。在连续脉冲冲击下,随着冲击脉冲时间间隔的增大,二次冲击接地电阻由土壤击穿时的较低值增大,逐渐恢复到单脉冲冲击接地电阻;但在一定的时间间隔范围内,含水量较少的土壤中接地装置的二次冲击接地电阻明显大于单脉冲冲击接地电阻;不同形状及不同材料接地体的二次冲击接地电阻不同。在杆塔接地设计时应考虑连续雷电冲击下冲击接地电阻增大现象,综合考虑接地体的材料及其形状。基于实验结果,提出连续雷电冲击下杆塔接地系统的ATPDraw仿真建模方法,该方法能较好地模拟冲击接地火花效应和土壤击穿后土壤电阻率恢复过程。In order to analyze the impulse characteristics of tower grounding device under continuous lightning impulse,continuous impact tests of typical grounding bodies with different soils,materials and shapes are carried out.Under continuous pulse impact,with the increase of impulse time interval,the secondary impact grounding resistance increases from the lower value at soil breakdown to the single pulse impact grounding resistance.However,within a certain time interval,the secondary impulse grounding resistance of grounding device in soil with less water content is significantly greater than that of single pulse impulse.The secondary impulse grounding resistances of grounding bodies with different shapes and materials are different.In the tower grounding design,the increase of impulse grounding resistance under continuous lightning impulse needs to be considered,and the material and shape of grounding body should be comprehensively considered.Based on the experimental results,the ATP Draw simulation modeling method of tower grounding system under continuous lightning impulse is proposed.This method achieves good effect when simulating the spark effect of impulse grounding and the recovery process of soil resistivity after soil breakdown.

关 键 词：连续雷电冲击 杆塔接地 冲击接地电阻 土壤电阻率 

分 类 号：TM862[电气工程—高电压与绝缘技术]