220 kV及110 kV六回路同塔线路的设计应用

110 kV 同塔六回塔型的选择, 需重点分明地考虑以下几点: 铁塔结构清晰、受力与传力应尽可能简单, 并能满足分期架设和带电作业的要求; 能满足耐雷水平要求, 并尽可能降低双回乃至多回同时跳闸率; 走廊宽度不宜过大, 铁塔横担不宜太长, 施工、运行及维护方便; 同时, 尽可能优化杆塔结构, 以降低铁塔耗钢量; 还应对同塔多回路运行情况: 断线、倒塔、风偏以及雷击跳闸率、单回跳闸率、多回同期跳闸( 异名相故障等) 的跳闸率等进行深入调查、分析研究。

Application of 220kV and 110kV Six-Circuit Line Design

In 220/110 kV six-circuit line tower selection, it is necessary to emphasize following considerations: tower structure must be clear, force applied and transferred must be as simple as possible, and it must meet staged stringing and live-line operation requirements; it must meet lightning withstand requirements and reduces double- or multi-circuit trip rates as far as possible; the corridor should not be too wide, cross arm should not be too long, and should be easy for construction, operation, and maintenance; in the mean time, the pole and tower structure should be optimized as far as possible to reduce steel consumption. Besides, in-depth investigations and analysis of line broken during operation, tower collapse, windage, and lighting-caused trip rate, single- and multi-circuit trip rates, multi-circuit synchronized trip (different phase failure) should be carried out.