摘要
引雷塔接地电阻在不同土壤电阻率下各不相同,为研究引雷塔的引雷能力与引雷塔接地电阻之间的关系,设计了1∶12.5缩比模型引雷塔,在长度为1 m的空气间隙条件下,利用波形参数为-250μs/2 500μs的负极性操作波对分别接10Ω和100Ω接地电阻的模型塔进行了50组接闪放电试验,并对放电过程进行了观测。结果显示:相同条件下,接10Ω接地电阻的模型塔接闪放电次数为接100Ω接地电阻模型塔的2.85倍。试验结果表明:引雷塔的引雷能力和接地电阻的大小呈现负相关,即接地电阻越小,引雷塔的接闪概率越大。引雷塔的接地性能对其吸引雷击有影响,减小引雷塔的接地电阻有利于提高其对雷电的接闪能力。
Grounding resistance of the triggering lightning tower is different in different regions.In order to study relationship between triggering lightning ability and grounding resistance,this paper designs a scaled model of the triggering lightning tower in the ratio of 1∶12.5 respectively.Under the condition of 1 m length of air gap,it uses the negative polarity operation wave with waveform parameter of-250μs/2 500μs to carry out 50 groups of flashover discharge tests for the tower respectively connecting with10Ωand 100Ωgrounding resistance and observes discharge process.The results show in the same condition,the number of flashover discharge of the model tower with 10Ωgrounding resistance are 2.85 times than those of the model with 100Ω.The test results indicate triggering lightning ability of the triggering lightning tower shows negative correlation with the grounding resistance:the smaller the grounding resistance is,the larger the flashover probability is.Meanwhile,grounding performance of the triggering lightning tower has an effect on attracting lightning stroke,thus it is beneficial to improve flashover ability of the triggering lightning tower by reducing the grounding resistance.
引文
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