±1100 kV特高压直流输电线路重冰区绝缘设计

Insulation Design for Heavy Icing Area of ±1100 kV UHVDC Transmission Line

摘要:

±1100 kV特高压直流线路由于输送距离远、沿途气象条件复杂，存在覆冰、污秽区，是线路外绝缘研究领域的难点。在分析覆冰、污秽条件直流外绝缘闪络特性的基础上，依据中国电力科学研究院的全尺寸覆冰闪络特性研究成果，对重冰区±1100 kV直流输电线路绝缘子型式及绝缘子片数选择进行推导研究，推荐了基于年度等值盐密及饱和等值盐密的绝缘配置方案。同时，探讨了多串绝缘子并联条件对绝缘冰闪电压影响。

Abstract:

Due to the long transmission distance and complex meteorological conditions along ±1100 kV UHVDC transmission line, there is icing area and polluted area, which is the difficult problem in the research field of external insulation of ±1100 kV DC transmission projects. Based on the research results of full-scale icing flashover characteristics in China Electric Power Research Institute, the insulator type and insulator number of ±1100 kV DC transmission line in heavy icing area are analyzed. The insulation configuration scheme based on the annual equivalent salt density and the saturated equivalent salt density is recommended, and at the same time, the influence of icing flashover voltage on multiple insulator strings in parallel is discussed.