1000kV交流紧凑型输电线路潜供电流和恢复电压计算分析  

Secondary Arc Current and Recovery Voltage of 1000kV AC Compact Transmission Line

作　　者：娄颖[1] 戴敏[1] 何慧雯[1] 李振强[1] 

机构地区：[1]国网电力科学研究院,武汉430074

出　　处：《高电压技术》2011年第8期1882-1887,共6页High Voltage Engineering

基　　金：国际科技合作项目(2008DFR60010)~~

摘　　要：1000 kV特高压紧凑型线路潜供电流和恢复电压较特高压示范工程大,会降低单相重合闸的成功率,影响特高压系统的安全稳定性。为此,阐述了特高压紧凑型线路潜供电流和恢复电压的特点,基于两个500 kV区域电网之间采用特高压紧凑型线路作为联络线的系统,用EMTP程序计算分析了紧凑型线路潜供电流和恢复电压的影响因素。研究结果表明:采用并联高抗的中性点小电抗是限制潜供电流和恢复电压的有效措施,小电抗应兼顾绝缘水平和抑制潜供电流和恢复电压优化选择。要满足采用0.7 s单相重合闸的要求,紧凑线线路长度从100 km至500 km,高抗补偿度应从70%提高到95%。线路换位对潜供电流熄灭的影响相比环境等随机因素的影响和换位塔的造价,可以不予考虑,建议紧凑型线路不换位。The characteristics of 1000 kV AC compact transmission line are discussed, and the calculating results of secondary arc current and recovery voltage of 1000 kV AC compact transmission line using EMTP under different conditions such as the different length of the transmission line, the compensation factor, transposition, are preSen- ted. Simulation results show that the neutral reactor for HV shunt reactors can effectively limit the second arc cur- rent and recovery voltage, and the principle of selection of neutral reactor must take both insulation level and re- straint of second arc current together with recovery voltage into consideration. It is required that the time of reclos- ing should be 0. 7 s, the length of compact transmission line be 100 km to 500 kin, and the degree of compensation be 95 %, instead of 70 %. However, the influence of transposition, compared with random factors such as environ- ment, or the cost of construction of transposition tower, is negligible. The transposition is not recommended for compact transmission line.

关 键 词：1000 KV 特高压紧凑型输电线路 潜供电流 恢复电压 线路长度 补偿度 线路换位 

分 类 号：TM723[电气工程—电力系统及自动化]