V形复合绝缘子力学特性研究

Characteristic Study for Windage Yaw Analysis of V-Shape Composite Insulator String

绝缘子串的风偏闪络一直是影响输电线路安全运行的主要问题之一。针对哈密—郑州±800 k V特高压直流工程的V形复合绝缘子串风偏设计校核问题,在I形绝缘子串弦多边形方法的基础上,构建并推导了适用于V形复合绝缘子串(含金具等)的弦多边形计算方法,并利用有限元方法验证了该方法的准确性和有效性,给出了确定该方法适用范围的最小轴向拉力计算方法。进而基于该特高压线路的参数,应用此方法研究了V串夹角、导线平均高度及水平档距/垂直档距组合变化对风偏特性的影响。结果表明,在给定垂直档距和水平档距条件下,建议V串夹角随导线平均高度增大而增大;在给定导线平均高度和垂直档距条件下,建议V串夹角随水平档距增大而增大;在给定导线平均高度和水平档距条件下,建议V串夹角随垂直档距增大而减小。给出了不同导线平均高度、垂直档距和水平档距条件下所建议的V串夹角值。

Windage yaw discharge is one of the most disastrous problems for the normal operation of state grid. Accounting for windage yaw problem of V-shape composite insulator string used in Hami-Zhengzhou ultrahigh voltage direct current transmission line, a practical calculation method is developed based on string polygon method for I-shape pan insulator strings. Finite element analysis is used to verify the validation and effectiveness of proposed method. Calculation method of minimum axial tension force determining its application range is also presented. Then windage yaw characteristic study is conducted for Hami-Zhengzhou ultrahigh voltage direct current transmission line, with the influence analysis of mean height of conductors, insulator string angle, horizontal span and vertical span. The results indicate that, with given vertical and horizontal span length, the suggested angle of insulator string increases with the increase of mean height of conductors; with given mean height of conductors and vertical span length, the suggested angle of insulator string increases with the increase of horizontal span length; with given mean height of conductors and horizontal span length, the suggested angle of insulator string decreases with the increase of vertical span length. The suggested angle of insulator string under different conditions are presented.