武汉大学 电气工程学院，湖北省 武汉市 430072

特高压交流输电线路ZBS2型酒杯塔的两地线间距大，因此研究其中相雷电屏蔽性能十分必要。文章采用按63﹕1的比例缩小的线路模型，考虑导线电压，使用更能逼近自然雷电的操作波进行了大量的冲击放电试验，得出了中相绕击的最大高度。根据文中的试验结果可知，换算出的中相临界绕击电流小于耐雷水平，验证了分别采用电气几何模型方法和先导模型方法得到的计算结果的正确性。试验结果还表明，ZBS2型杆塔线路中相有绕击的可能性，但不会导致闪络。

特高压交流   ZBS2型杆塔   中相绕击   模拟试验   电气几何模型(EGM)   先导模型(LPM)

The spacing between the two ground wires of ZBS2 cup-tower used in UHVAC transmission line is large, so it is significant to research the thunder and lightning shielding properties of the intermediate phase. A lot of impulse discharge experiments are conducted by operation wave that can be more close to natural lightning, in these experiments the proportion of the size of experimental model to that of actual ZBS2 tower is 1:63, and the maximum height of the shielding failure of intermediate phase is obtained. It is known from the test results that after the post-conversion critical shielding failure current of the intermediate phase is lower than lightning withstand level, thus the correctness of calculation results from electrical geometrical model and leader propagation model respectively is validated. Test results also show that in transmission line using ZBS2 type of tower the shielding failure may happen in the intermediate phase, but it will not cause flashover.

UHVAC   ZBS2 type of tower   shielding failure of intermediate phase   simulation test   electrical geometrical model (EGM)   leader propagation model (LPM)