【摘要】 由于电压等级较高,1000 kV特高压交流输电线路瓷绝缘子串电位分布很不均匀,导线侧电场集中现象严重,需要安装合适的均压环来改善绝缘子串的电位电场分布。应用3维有限元法,对特高压交流输电线路悬垂瓷绝缘子I串和V串的电位电场分布进行了仿真计算,得到了瓷绝缘子串的分布电压曲线;分析了均压环的位置、中心距和管径变化时对瓷绝缘子串的分布电压和电场分布的影响;最终给出了合理的均压环配置方案。通过对1000kV特高压交流输电线路均压环的配置优化,能够改善瓷绝缘子串的分布电压,降低均压环和金具表面的电场强度,其成果已经成功应用于我国特高压交流试验示范工程,效果明显。更多还原

【Abstract】 Grading rings are needed to install to improve both the electric field and voltage distribution.Consequently,electric field and voltage distribution of double I and double V porcelain insulator strings were calculated with three-dimensional FEM.The voltage distribution curves along insulators were obtained.Meanwhile,by optimizing the structure parameters of grading ring,the influences of position,diameter and caliber of grading ring on voltage distribution and electric field were calculated and analyzed.Finally,reasonable parameters of grading ring were proposed.The research has been successfully applied in the UHV AC demonstration project.As a result,the voltage distribution of insulator strings is improved and the electric field strength of grading ring and fittings is reduced.更多还原