Discharge Characteristics of ±1100 kV UHV DC Tower Air Gaps

被引：0
|
作者：
Ding Y.J. [1 ]
Lü F.C. [1 ]
Li P. [2 ]
Zhou F.F. [1 ]
Yao X.Y. [2 ]
Gao H.F. [3 ]
机构：
[1] School of Electrical & Electronic Engineering, North China Electric Power University, Beijing
[2] China Electric Power Research Institute, Haidian District, Beijing
[3] State Grid Corporation of China, Xicheng District, Beijing
来源：
Ding, Yu Jian (dingyj@epri.sgcc.com.cn) | 2018年 / Power System Technology Press卷 / 42期
关键词：
Air gap; Altitude correction; Flashover characteristics; Gap factor; ±1100kV DC transmission line;
D O I：
10.13335/j.1000-3673.pst.2018.0176
中图分类号：
学科分类号：
摘要：
±1100kV DC transmission line is of a new higher voltage level. In order to guarantee design reliability and rationality, air clearance choice is very important and need to be researched. The same configuration and real size simulation tower of ±1100kV DC line was used to carry out impulse voltage test at SGCC UHVDC test base in Beijing and Tibet high altitude test base located at 4300m above sea level. Test curves of flashover characteristics of switching impulse and lightning impulse were acquired, and dispersion of switching impulse and lightning impulse discharge voltage at different altitudes was analyzed. Gap factors in range of 6m~11m were analyzed using switching impulse of typical rod-plane gap. Then, according to altitude correction method stipulated in IEC60071-2, voltage correction factors of ± 1100kV tower switching impulse and lightning impulse were analyzed, and voltage correction factor m of switching impulse was calculated. Finally, combined with the results of overvoltage calculation of a real ± 1100kV transmission line project, minimum gap distance of switching impulse voltage and DC voltage for ± 1100kV transmission line at altitude 3000m and below was recommended. Results show that altitude has no obvious effect on dispersion of impulse discharge voltage. For switching overvoltage 1.57pu, the minimum gap air distance on ±1100kV DC transmission line tower is 8.3meters at altitude 1000m, the minimum air gap distance is 9.8m at altitude 3000m. DC voltage requires smaller gap distance, 4.2m at altitude 3000m. © 2018, Power System Technology Press. All right reserved.
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页码：1032 / 1038
页数：6
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