同塔多回路输电线路的设计

同塔多回路线路的最大优点是节约线路走廊 ,缺点是导线对地距离加大 (居民区 :d型塔 18m ,e型塔 15 .5m ,比规程规定的 14m大 ;非居民区 :d型塔 14 .5m ,e型塔 13.0m ,比规程规定的 11m大 ) ,线路的防雷性能变差 ,(经计算需采取加强绝缘 ,d型塔加耦合线等常规措施 ,才能使耐雷水平满足要求 ) ,相序换位困难 ,铁塔荷载大等。因此 ,它适用于经济发达、走廊困难、线路较短场合发展、使用。

Design of Multiple Circuit Transmission Line on one Tower

The best advantage of the multiple-circuit transmission line on one tower is to save the corridor of the line and its shortcoming is to increase the distance of the conductor to the ground (resident area: 18 m for d-type tower, 15.5 m for e-type tower,14 m higher than that specified in the code; non-resident area: 14.5 m for d type tower, 13.0 m for e-type tower, 11 m higher than that specified in the code). Furthermore the anti-lightning performance of the line becomes worse, which is proved by calculation with insulation to be enhanced (conventional measures should be taken like coupling wire used for d-type tower to meet the requirement for anti-lightning level). It is difficult for shift of phase sequence and big load on the tower. Therefore this kind of towers is only suitable for places with developed economy, narrow corridor and short routine of lines.