含零值绝缘子高压架空输电线路绝缘子串空间电场分布特性

Spatial Electric Field Distribution Characteristics of Insulator Strings in High-Voltage Overhead Transmission Lines With Zero Value Insulators

基于有限元电场仿真方法,研究了110kV和220kV不同绝缘子串型出现零值绝缘子时邻近区域空间电场分布特性,对比合成电场和轴向电场分量对零值绝缘子的敏感度。针对单I悬垂串、双II悬垂串和耐张串等串型,分析零值绝缘子对不同串型的影响程度,定量分析零值绝缘子位置和片数对场强分布的影响特性。结果表明:轴向场强分量对零值绝缘子更为敏感,作为零值绝缘子检测的特征量更为合适;高压侧存在零值绝缘子对电场分布影响最大;对于悬垂双II串应分别测量两侧的场强,以判断零值绝缘子出现位置;连续2片、3片零值时场强下降幅度分别为单片零值的2倍和2.3倍等。

This article uses finite element simulation calculation method to study the electric field distribution characteristics when zero value insulators appear in different insulator string types of 110 kV and 220 kV,and compares the sensitivity of composite field strength and axial field strength to zero value insulators.The influence of zero value insulators on different string types is analyzed for single I suspension string,double II suspension string,and tension string.In addition,the influence of zero value insulator position and number on field strength distribution characteristics is quantitatively analyzed.The results show that the axial field strength is more sensitive to the occurrence of zero value insulators,and it is more suitable as a characteristic quantity for detecting zero value insulators.The presence of zero value insulators on the high-voltage side has the greatest impact on the electric field distribution.For the suspension double II string,the field strength on both sides should be measured separately to determine the location of zero value insulators.The decrease in field strength for two and three consecutive zero values is twice and 2.3 times that of a single zero valuerespectively.