高电压技术2017，Vol.43Issue(10)：3182-3188,7.DOI:10.13336/j.1003-6520.hve.20170925006
±1100kV输电线路Y型绝缘子串间隙放电特性及污闪特性分析
Analysis on Air-gaps Discharge and Pollution Flashover Characteristics of Y-type Insulator Strings for ±1100 kV Transmission Lines
摘要
Abstract
By shortening the length of Ⅴ-string single leg,and increasing the lower Ⅰ string,the length of the arm for Y-type insulator string can be shortened,thus optimizing the size of the tower head and reducing the tower single-base indicators.We experimentally investigated ±1 100 kV ultra high voltage direct current (UHVDC) gap discharge of Y-type insulator string and artificial pollution.The gap discharge test was performed with standard operation impulse voltage,and the Ⅴ-Ⅰ ratio was set as 8:1 and 7∶2 with different distance between the conductor and the tower.In the artificial pollution test,the Ⅴ-Ⅰ length ratio was set as 8∶1 and 7∶2,the equivalent salt deposit density (ESDD) was set as 0.05,0.08 and 0.15 mg/cm2 and the length of insulator string was set as 4.37 and 7.7 m.Finally,the air-gap flashover characteristics and pollution flashover characteristics of Y-type insulator strings of±l 100 kV UHVDC were obtained.The test results reveal that when the Ⅴ-Ⅰ insulator length ratio is 8∶1,breakdown will tend to occur under impulse voltage because the Ⅰ-type insulator string is too short,while the insulat ratio is 7∶2,discharge will tend to occur between the shielding ring and the tower.Under conditions of the two ratios,there is no significant difference between the gap impulse discharge voltage and insulators' pollution flashover voltage,and the difference is 2.8％ and 5％,respectively.The DC pollution withstand voltage of the Y-type string shows an power exponent relation with the ESDD,and a linear relationship with the length of string.Besides,comparison of the test results of Y-type,Ⅴ-type,and Ⅰ-type shows that the string type has no significant differences in the gap discharge characteristics and the pollution flashover characteristics.The research results of this paper can provide an important reference for ±1 100 kV transmission line Y-type insulator string gap configuration and pollution external insulation configuration and they are of great value for the application and popularization of ±1 100 kV UHVDC transmission line in China.关键词
±1100 kV输电线路/Y型绝缘子串/间隙放电特性/污闪特性/操作过电压/人工污秽试验Key words
±1 100 kV transmission line/Y-type insulator string/air-gaps discharge characteristics/pollution flashover characteristics/operation overvoltage/artificial contamination test引用本文复制引用
刘琴,霍锋,周魁,李健,叶奇明,李瑶琴..±1100kV输电线路Y型绝缘子串间隙放电特性及污闪特性分析[J].高电压技术,2017,43(10):3182-3188,7.基金项目
中国电力工程顾问集团中南电力设计院有限公司科技项目(GYW11201602848).Project supported by Science and Technology Program of Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group (GYW11201602848) （GYW11201602848）
