摘要
特高压输电线路分布电容大,分布电感小,电阻小,且传输距离远,故障暂态量大且暂态过程明显。研究特高压输电线路在故障和合闸过程中的暂态电流特征,对于分析保护的动作行为很有意义。针对750kV及特高压带并联电抗器的输电线路,采用简化模型推导了故障及合闸过程中的暂态电流公式。分析了影响暂态电流中自由分量频率和幅值的各种因素。大量ATP仿真验证了理论分析的正确性,并讨论了不同暂态情况下保护算法可能受到的影响。
The fault characteristics of UHV transmission line are of obvious transient process with a great deal of transient components, as a result of long distance, large distributed capacitance and small distributed inductance and resistance. The research on transient current characteristics of UHV transmission line during faults and breaker operation is useful for analyzing the actions of protective relaying. For 750 kV and UHV transmission line using simplified line model, the transient current formulas of faults and switch-in operation are derivated, and then various factors that affect the frequency and amplitude of free component in transient current are analyzed. ATP simulation testifies the validity of theoretical analysis. The effect of the transient current on protection algorithm is also discussed.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2006年第3期18-23,共6页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(50477037)
关键词
特高压
暂态电流
电流频谱
ultra high voltage（UHV）
transient current
current spectrum
