摘要
500 kV输电线路是我国电网的主干网架,运行中一旦发生绝缘子污闪事故将严重威胁电力系统可靠运行,因此了解运行电压下绝缘子的自然积污规律及其污闪特性十分重要。对重庆电网某500 kV交流输电线路运行中绝缘子的自然积污情况及污闪特性开展了测试研究,研究结果表明:运行中绝缘子上/下表面累积的盐密/灰密有差异,且下表面的盐密/灰密较上表面的严重;运行中绝缘子表面灰密累积速度大干盐密累积速度;运行中各串绝缘子以及绝缘子串中各片绝缘子的积污均存在差异;自然积污下绝缘子污闪电压比人工染污下绝缘子污闪电压高;污秽成分及绝缘子表面污秽分布的差异是导致运行中绝缘子污闪电压高的主要原因。
500kV transmission line is the backbone of Chinese power grid. The event of insulator pollution flashover under service voltage may serious threat to reliable operation of power systems, so it is important to study the natural characteristic of pollution accumulation and flashover performance of insulator energized the operating voltage. This paper mainly focus on the insulator strings operating in certain 500kV power network in Chongqing, tests and analyzes the pollution depositing rules and flashover performance of them. Test results indicate that the value of equivalent salt deposit density （ESDD） on the top surface of insulator is lower than that on the bottom, as well as the value of non-soluble deposit density （NSDD）;the accumulation rate of NSDD is heavier than that of ESDD; the pollution depositing on each insulator string and each insulator are different; at the same pollution level, the flashover voltage of natural contaminated insulator is higher than that of artificial polluted insulator, which mainly caused by the difference of pollution composition and non-uniform pollution distribution on the insulator surface.
出处
《陕西电力》
2013年第4期24-30,共7页
Shanxi Electric Power
关键词
绝缘子
等值盐密
等值灰密
自然积污
闪络电压
insulator
ESDD
NSDD
natural contamination depositing
flashover voltage
