1000kV交流双回路单柱组合耐张塔型式规划

Planning Research on Single-Pole-Combined Strain Tower for 1000kV AC Double-Circuit Transmission Line

针对在1000kV交流特高压双回输电线路中使用鼓(伞)型耐张塔的不足,设计了一种全新的耐张塔型——单柱组合耐张塔,其特点是分塔挂线、无导线横担、水平布置跳线、灵活性好、施工方便等,与鼓(伞)型塔相比,在杆塔高度、塔重、横担长度、跳线等方面的技术经济性较为优越。最后提出了该塔在电磁环境、跳线、防雷等设计方面需要进一步探讨的技术问题。

In view of the shortcomings of adopting conventional drum-type or umbrella-type strain tower in 1000kV AC double-circuit transmission line, a brand new type of strain tower that is named as single-pole-combined strain tower, that consists of main pillar and sub-pillar, is designed. The features of the designed strain tower are as following： the conductors of three-phase double circuits are vertically arranged on two adjacent and mutual independent main pillars respectively while the jumpers are led to sub-pillar and horizontally arranged; cross-arm is not adopted; the main pillar and sub-pillars can be configured flexibly and the topographical restriction can be adapted conveniently; and the designed single-pole-combined strain tower is easy to construct. Comparing with conventional drum-type or umbrella-type strain towers, the designed strain tower possesses more superior technical and economical performance in tower height, tower weight, cross-arm length and jumpers. Finally, the authors put forward some technical problems to be further researched in the design of the proposed strain tower such as combination form of single-pole-combined strain tower, electromagnetic environment, jumper, lightning protection and so on.