Numerical electromagnetic field analysis on measuring methods of tower surge impedance
Numerical electromagnetic field analysis on measuring methods of tower surge impedance
复制标题
杆塔浪涌阻抗测量方法的数值电磁场分析
DOI：
10.1109/61.754110
复制
发表时间：
1999
影响因子：
4.4
通讯作者：
M. Ishii
中科院分区：
文献类型：
--
作者：
Y. Baba;M. Ishii
利用NEC-2，研究了塔浪涌阻抗与测量方法的关系。用直接法测得的塔浪涌阻抗随电流引线的排列而变化。垂直电流引线和水平电压测量线的布置在延伸到电压测量线时比用水平电流引线测量的值高约20%。前者给出了典型双回塔的150 /spl ω /，几乎等于IEEE工作组推荐的估计方法给出的值。当模拟垂直雷击的电流注入连接点时，用塔顶分流比计算得到的塔浪涌阻抗比直接法高20%以上。另一方面，折射法测得的塔浪涌阻抗比直接法测得的低10%左右。
The dependence of the tower surge impedance on the measuring methods is studied with the help of NEC-2. The tower surge impedance measured by the direct method varies dependent on the arrangement of the current lead wire. The arrangement of a vertical current lead wire and a horizontal voltage measuring wire gives about 20% higher value than that measured with a horizontal current lead wire in extension to a voltage measuring wire. The former gives about 150 /spl Omega/ for a typical double-circuit transmission tower and it is almost equal to the value given by the estimating method recommended by the IEEE Working Group. The tower surge impedance evaluated from the current splitting ratio at the tower top is more than 20% higher than that characterized by the direct method when the current is injected into the connecting point from a simulated vertical lightning stroke. On the other hand, the tower surge impedance evaluated by the refraction method is about 10% lower than that characterized by the direct method.