特高压交流线路新型绝缘子Y型串污耐压特性

Pollution Withstand Voltage Characteristics of Y-shape Insulator String on UHVAC Transmission Lines

特高压交流输电线路Y型绝缘子串在输电走廊紧张、气候条件恶劣的地区应用对于压缩杆塔宽度、高度和提升绝缘子串运行寿命具有重要实用价值。针对特高压交流绝缘子Y型串结构特点,开展了特高压Y型串、V型串和I型串人工污秽试验和电场仿真分析,获得了特高压Y型串的污耐压特性以及电场分布特性。研究结果表明:特高压交流复合绝缘子Y型串污耐压盐密分别为0.1、0.15、0.25 mg/cm2,灰密为1.0 mg/cm2时,单位结构高度下绝缘子50%耐受电压与盐密之间呈非线性负指数幂关系递减,参数A=95.3,α=0.11,其中复合绝缘子Y型串耐受电压较绝缘子I型串低约20%。该研究成果可用于特高压新型绝缘子Y型串的串型设计,改善绝缘子串绝缘特性,实现新型绝缘子串在后续特高压工程中的逐步应用和推广。

The Y-shape insulator string for UHVAC transmission line can realize optimization of wire suspension modes and insulator string performance by changing the string structure, which is of great practical values for special transmission corridors and bad weather conditions with excessively high costs of cleaning. Therefore, voltage-endurance tests and electric field simulation calculations are conducted against UHV Y-shape, V-shape, and I-shape insulator strings, and recommended a new type of Y-shape insulator string structure which is applicable to China＇s UHVAC transmission lines and insulation design.Test results indicate that, firstly,the relationship between Us0o/o and salt deposition density is nonlinear and negatively exponentially decreases when the SDD is set as 0.1 mg/cm^2, 0.15 mg/cm^2, 0.25 mg/cm^2 and NSDD as 1.0 mg/cm^2;secondly, the U5o% value of Y-shape insulator string is 20.1% lower than that of I-shape insulator string, the parameter A is 95.3, and a is 0.11. The obtained results can be used for string design of the new type of UHV Y-shape insulator string to improve the insulation properties of insulator string, and realize gradual application and popularization of the new insulator string in the follow-up UHV engineering.