摘要
为了分析影响低气压覆冰条件下绝缘子直流闪络特性的因素,在人工气候室内模拟高海拔、覆冰条件,对FC160P/C170 DC玻璃绝缘子和10 kV直流合成绝缘子进行试验研究,得到了空气间隙的距离与闪络电压的关系,并分析了覆冰状况对覆冰表面闪络特性的影响。试验结果表明:覆冰闪络电压随着空气间隙的增长而升高;上空气间隙时的闪络电压高于下空气间隙时的闪络电压;合成绝缘子因伞间距离小,易被冰凌和电弧桥接,覆冰和气压对其影响比瓷和玻璃绝缘子严重;低气压下,覆冰绝缘子发生飘弧时,其闪络电压大大降低。
For the analysis of factors effecting DC flashover performance of insulator under icing and low atmospheric pressure condition, laboratory investigations of discharge processes and flashover performances under icing and high altitude condition simulated in the artificial climate chamber are carried out on FC160P/C170 DC glass insulator and 10 kV DC composite insulator in this paper. Based on the laboratory investigations, the relation between the flashover voltage and the air gap length has been obtained in colligated condition of low atmosphere pressure and icing at high attitude districts. The effects of ice status on the flashover performance of ice surface have been analyzed and the effects of the place of air-gap on the flashover voltage have been discussed. Test results indicate that the flashover voltage increases with the increase of ice length. Due to different insulation material, the place of air-gap is different in the flashover test. It can be seen from the results obtained that the flashover voltage of the upper air-gap is higher than that of the lower air-gap. Due to short shed-gap of the composition insulator, the shed-gaps are easy to be bridged by icicles and arc, and this can reduce the effective leakage distance of insulator and results in reducing the flashover voltage. So the effect of icing and air pressure on the composite insulator is greater than that on the glass insulator and on the porcelain insulator. Because the arc radius is relatively large under low atmospheric condition and the arc current of DC arc does not pass zero, the arc can stably burn, soothe arc is easy to hike up from the surface of insulator and bridge sheds, the flashover voltage is reduced.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第6期15-17,共3页
High Voltage Engineering
作者简介
武利会 1974-，男，硕士，从事高电压与绝缘技术及输电线路的运行管理工作。E-mail：fs-wlh@126．com
