摘要
建立了1 000 kV双端电源输电线路模型,利用EMTP仿真计算加装快速接地开关(HSGS)前后和加装带中性点小电抗的并联电抗器前后潜供电流的幅值,结果显示,加装带中性点小电抗的并联电抗器限制潜供电流的效果更优。分析了接地过渡电阻的取值和线路载流量对潜供电流的影响,结果表明两者对补偿前的潜供电流影响很小,对于加装HSGS后,线路载流量的影响依然很小,而接地过渡电阻的取值对潜供电流影响较大,潜供电流随接地过渡电阻增大而减小。分析显示,对于某特高压示范线路,HSGS的接地电阻选取小于1.5Ω时较合理,中性点小电抗取为150Ω左右时潜供电流和恢复电压出现最小值。对1 000 kV的长线和短线分别仿真,可知线路越长,潜供电流越大。
The model of 1 000 kV transmission line with two sources is established,based on which the secondary arc currents are calculated with EMTP for that with and without the HSGS（High Speed Grounding Switch） or the SRNR（Shunt Reactor with Neutral Reactance）. It shows that, the SRNR is better for the secondary arc current suppression. The influences of the transient grounding resistance and the line carrying capacity on the secondary arc current are discussed. Results show that,only the transient grounding resistance influences obviously the secondary arc current of line with HSGS, the bigger the resistance is, the smaller the arc current will be. The analysis shows that,for the UHV line,it is more reasonable to set the HSGS grounding resistance at less than 1.5 Ω and both the secondary are current and recovery voltage are minimal when the shunt reactor is set at 150 Ω. Simulations are carried out for long and short lines separately, which shows that, the longer the line is, the bigger the secondary arc current will be.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第4期71-75,共5页
Electric Power Automation Equipment
关键词
特高压
仿真
潜供电流
并联电抗器
快速接地开关
中性点小电抗
ultra high-voltage
simulation
secondary arc current
shunt reactor
high speed grounding switch
neutral reactor
