特高压直流输电线路山区边坡塔研究

doi:10.11930/j.issn.1004-9649.2017.02.040.06

摘要/Abstract

摘要： 特高压直流线路主要经过山区,雷电活动频繁,采用负保护角设计后雷击跳闸率仍然较高。提出一种减小绕击跳闸率的新塔型——边坡塔,采用电气几何模型法分析其防绕击性能,同时采用CDEGS 软件结合公式法对边坡塔的电磁环境做了评估,通过结构受力分析判断铁塔内力情况,从塔重、混凝土指标对比分析边坡塔的经济性。结果表面,边坡塔防绕击性能明显优于常规T型塔,电磁环境满足限值要求,铁塔内力与T型塔相当,工程造价与T型塔基本一致,为边坡塔在多雷山区特高压直流线路中的应用提供依据。

关键词: 特高压直流, 边坡塔, 绕击, 多雷山区

Abstract: UHVDC Transmission lines are mainly across mountainous area with frequent lighting activities. Even with negative protection angle, lightning trip out rate is still high. A new type of tower, slope tower, which can reduce shielding failure rate is proposed. Its lighting protection performance is analyzed by using electrical geometry model. Combined CDEGS simulation software with empirical formula, its electromagnetic environment performance is also evaluated. The internal structure force, characteristic of economic feasibility, tower weight and amount of concrete of proposed design are also discussed. Results show that slope tower performs much better than usual T-type tower in lightning protection. Its electromagnetic environment level meets standard requirement. Tower’s inner force and construction cost is comparable with regular T-type tower. Slope tower is suitable for UHVDC transmission lines travelling through heavy lightning mountainous area.

Key words: UHVDC, slope tower, lightning shielding failure, heavy lightning mountainous area

中图分类号:

TM753

宋刚, 陈稼苗, 潘峰. 特高压直流输电线路山区边坡塔研究[J]. 中国电力, 2017, 50(2): 40-45.

SONG Gang, CHEN Jiamiao, PAN Feng. Study on Slope Tower in UHVDC Transmission Line in Mountainous Area[J]. Electric Power, 2017, 50(2): 40-45.

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https://www.electricpower.com.cn/CN/Y2017/V50/I2/40

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