750 kV绝缘子串电位分布仿真及试验研究

采用有限元数值分析法,针对750 kV交流输电线路绝缘子片数及均压环配置,对绝缘子串电位分布进行了计算分析,比较了均压环均压深度、环径、管径及绝缘件介电常数对绝缘子电位分布的影响;对典型配置绝缘子"I"串进行了电位分布的测量研究,并将试验和计算的结果进行了对比分析。研究表明,均压环均压深度及环径对绝缘子电位分布影响较大,均压环管径及绝缘件介电常数对电位分布影响不明显;试验与计算的绝缘子最高分布电压百分比基本一致。

Simulation and Test of Potential Distribution for 750 kV Insulator String

Based on the configuration of insulators and grading rings on 750 kV transmission lines,this paper analyzes the potential distribution of insulator string with the finite-element method,and compares the influences of position depth,diameter,and tube diameter of grading ring,as well as dielectric coefficient of insulation material,on the potential distribution.Moreover,potential distribution of ‘I’ insulator string with typical configuration is measured at the UHV outdoor test field of SGEPRI,and the result is compared with the calculating one.This study demonstrates that position depth and diameter of grading ring remarkably influence the potential distribution of insulator string,the influences of tube diameter of grading ring and dielectric coefficient of insulation material are slight,and the maximal distributing voltage from test is approximately equal to that from calculation.