特高压输电线路分裂导线表面电位梯度的计算及其特性分析

通过对工程中计算导线表面电位梯度的常用数学模型进行准确度校验,提出逐步镜像法由于具有较高的计算精确度,而且最大误差远小于可以接受的工程误差限值,适合我国在进行特高压输电线路设计和电磁环境研究时使用。基于逐步镜像法,计算了1000kV交流单回和同塔双回输电线路的导线表面电位梯度,重点分析了线路对地高度、导线分裂根数、子导线半径、导线布置形式和双回路相序布置方式等因素对特高压线路分裂导线表面电位梯度取值特性的影响。

Calculation and characteristic analysis of surface voltage gradient for UHV transmission conductor bundle

Based on the accuracy verification of different mathematic models for calculating the conductor surface voltage gradient in engineering,it is pointed out that,the successive image method has higher accuracy and its maximum error is less than the engineering allowable limits,suitable for the design and electromagnetic environment research of UHV transmission lines. The conductor surface voltage gradient of 1 000 kV UHV AC single-and double-loop lines on the same tower is calculated by the successive image method and its influencing factors are analyzed in detail,such as height above ground,number and radius of subconductors,layout of phase conductors,phase order of double-loop lines and so on.