关键词: 1 000 kV特高压, 混合塔, 过渡节点, 动力特性, 经济性分析

Abstract: Almost all the towers of 1 000 kV UHV double-circuit transmission line in China used steel tube towers because of steel tube tower's obvious advantages against an angle steel tower. However, a steel tube tower requires complex manufacturing process and high quality control, and is difficult to construct. Even after a standardized design being adopted, the output of steel tube towers remains being challenged in meeting the increasing demand for large transmission towers. The paper presents a new plan and design of a hybrid tower with both steel tube and angle steel that meets the design conditions of the UHV steel tube tower for Anhui Electricity to East transmission project. The angle steel is used for all members above the lower cross arm with the rest of the hybrid tower using steel tube. The paper optimizes the transition node between the angle steel and the steel tube of the tower body, compares the dynamic characteristics between the hybrid tower and the steel tube tower, and conducts economic analysis on key economic parameters. The paper demonstrates the feasibility of using the new type hybrid tower to meet safe and stable operation of the transmission line, which significantly increases the proportion of angle steel used in the tower with corresponding reduction in the use of the steel tube, therefore effectively addresses the issue of insufficient output.

Key words: 1 000 kV UHV, hybrid tower, transition node, dynamic characteristic, economic analysis