摘要
特高压直流同塔混压输电线路可有效解决日益增长的电力需求和输电走廊资源紧缺的矛盾,准确评估其绕击耐雷性能,对线路设计和施工具有重要参考价值。基于电气几何模型计算绕击跳闸率,考虑了导地线、大地的相互屏蔽效应、地面倾角、雷电入射角和工作电压等因素的影响,并通过算例进行了分析验证,研究了特高压直流同塔混压输电线路的绕击耐雷性能及其影响因素。同时应用该模型对800 kV直流单回线路和500 kV直流同塔双回线路的绕击耐雷性能进行了研究对比,得出了特高压直流同塔混压输电线路绕击耐雷性能的特点。结果表明:500 kV线路的绕击耐雷性能优于800 kV线路;特高压直流同塔混压输电线路绕击耐雷性能与800 kV直流单回输电线路绕击耐雷性能近似相同,但比500 kV直流同塔双回输电线路绕击耐雷性能差。
Mixed-voltage double-circuit DC transmission lines on the same tower can be considered for solving the contradiction between the growing electricity demand and the limited line corridor. Accurately assessing the shielding performance of the UHV mixed-voltage double-circuit transmission lines （UMDTL） has a great reference value for design and construction of lines. Based on electro- geometric model and considering mutual screening effects among overhead ground wires and multi- layers of conductors and the influence of operating voltages on striking distance as well as such factors as incident angle of lightning. Taking 800 kV and 500 kV transmission lines for example, the impacts including protection angle, the ground slope angle and the tower heights on lightning shielding performance are researched. The anti-shielding failure performance of 800 kV single-circuit and 500 kV double-circuit transmission lines are also researched based on the electric geometry method proposed in this paper. Compared with the single circuit for 800 kV lines and the double circuit for 500 kV lines, characteristics of lightning withstand performance have been summarized for UMDTL. Results of the research show that the anti-shielding failure performance of 500 kV transmission lines is better than 800 kV transmission lines. And the lightning shielding performance of 800 kV/500 kV transmission line is similar to 800 kV.
出处
《电瓷避雷器》
CAS
北大核心
2015年第5期60-65,共6页
Insulators and Surge Arresters
基金
国家重点基础研究发展计划(973计划)(编号:2011CB209404)
关键词
直流输电
绕击
耐雷性能
电气几何模型
同塔混压
DC transmission line
shielding failure
lightning withstand performance
electro- geometric model
mixed-voltage lines on the same tower
