避雷线分流系数现场实测研究

提出一种能够在现场直接测试避雷线分流电阻的方法,建立了计算避雷线分流系数的实用数学模型,并对建立的数学模型和实测及相关数据进行分析、计算,推导出了较为实用的、简便的计算避雷线分流系数的近似计算式。计算结果表明:所测变电站接地网的接地电阻Rg越大,避雷线分流系数Ke1越大;否则,Ke1就越小。而避雷线分流系数Ke1,线路前10级杆塔接地电阻平均值Rav,线路平均档距Lav越大,避雷线分流系数Ke1越小;否则,Ke1就越大。

Site Measurement on Current Sharing Factor of Lightning

A site measuring method for shunt resistance of lightning conduetor was proposed.An mathematic model was established for calculating current sharing factor of lightning conduct and related data obtained from the mathematic model and site measurements were analyzed and calculated,and from that a practical simplified equation was deducted.Calculation result shows that the larger the measured ground grid resistance Rg of substation,the larger the sharing rate of the lightning conductor Kel,otherwise the smaller the Kel.The larger the sharing factor Ke,the mean ground resistance at 10 towers Rav and mean line span Lav,the smaller the sharing factor Kel,otherwise the larger Kel.