Analysis on Air-gaps Discharge and Pollution Flashover Characteristics of Y-type Insulator Strings for ±1 100 kV Transmission Lines

被引：0
|
作者：
Liu Q. [1 ]
Huo F. [1 ]
Zhou K. [2 ]
Li J. [2 ]
Ye Q. [1 ]
Li Y. [1 ]
机构：
[1] China Electric Power Research Institute, Wuhan
[2] Central Southern China Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Wuhan
来源：
Liu, Qin (liuqin2@epri.sgcc.com.cn) | 1600年 / Science Press卷 / 43期
关键词：
Air-gaps discharge characteristics; Artificial contamination test; Operation overvoltage; Pollution flashover characteristics; Y-type insulator string; ±1 100 kV transmission line;
D O I：
10.13336/j.1003-6520.hve.20170925006
中图分类号：
学科分类号：
摘要：
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 ±1 100 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. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3182 / 3188
页数：6
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