摘要
为解决深度限制特高压操作过电压水平,以我国即将建设的晋城—南阳—荆州1000kV线路工程为背景,结合国外对操作过电压水平的研究,利用电磁暂态计算程序PSCAD/EMTDC分别计算了沿线装设多组避雷器对三相合空线、单相自动重合闸以及故障激发等操作过电压的限制效果;研究了沿线装设多组避雷器深度限制操作过电压。计算表明,如果不装沿线避雷器,三相合空线、单相自动重合闸以及故障激发操作过电压最大值分别为1.83、1.83和1.53p.u.,而采用沿线装多组避雷器的方法可将上述3种特高压系统操作过电压抑制到<1.5p.u.。另外,随着避雷器组数的增加,通过避雷器的总能量增加,但单个避雷器的通流容量下降。
The idea of adopting some arresters installed along line to suppress switching overvoltage deeply in UHV is realized in this paper. Based on the UHV transmission line project, effects of arrestor＇s number and position on switching overvoltages, including three phases energizing line with no load, single phase auto-reclosing and overvoltage caused by fault are calculated by using the electromagnetic transient program PSCAD/EMTDC. The calculation shows that in the case without any arresters installed along line, the maximal overvoltage of three phases energizing line with no load, single phase auto-reclosing and overvoltage caused by fault are 1.83, 1.83 and 1.53 p.u.. respectively. When attesters are applied along line, the three overvoltage can be suppressed to 1.50, even lower than 1.50 pu, which means arresters along line is a good measure to suppress switching overvoltage in UHV. Besides amplitude of overvoltage, another main factor considered in this paper is the energy passing arresters. Calculation results show in three ovevoltages above, maximal energy passing single arrester is 2107.94 kJ, 866.42 kJ and 17.22 kJ respectively. And maximal total energy passing arrestors of one phase is 2534.67 kJ, 1215.61 kJ and 86.06 kJ respectively. By comparing the results, it is found that more attesters used along line, lower the overvoltage is, different position where arresters are placed effects the result of suppressing, and the maximal difference of overvoltage caused by position is 0.07 p.u.. Calculation of the energy shows that total energy passing arrestors of one phase generally increases with the arrestors number increasing, but for any single arrestor, the energy decreases. In the case of single phase auto-reclosing, the energy decreases from 866.42 kJ to 237.68 kJ when the number of arrester along line increases from 1 to 4. In the case of three phases energizing line with no load, energy decreases from 2107.94 to 958.67 while arrester＇s number increases from 1 to 4.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第12期11-15,39,共6页
High Voltage Engineering
基金
国家自然科学基金资助项目(50425721)
作者简介
陈水明 1968-，男，博士，副教授，从事电力系统过电压与电磁环境的教学与科研。E-mail：chensm@tsinghua.edu.cn
许伟 1982-，男，从事电力系统过电压和电磁环境的研究。
