特高压输电线路空载合闸于故障保护的研究  

Research on Unloaded Switching Into Fault Protection for UHV Transmission Line

作　　者：张武军[1] 何奔腾[1] 沈冰[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《中国电机工程学报》2008年第16期65-71,共7页Proceedings of the CSEE

摘　　要：超(特)高压输电线路空载合闸时暂态过程严重,降低了传统合闸于故障保护的动作速度。通过分析合闸于正常线路和故障线路时测量阻抗角的不同以及两种情况下电流中谐波噪声水平的差异,并辅之以带偏移特性的快速距离继电器,提出了一种空载合闸于故障保护的新方案。理论分析与EMTP仿真验证表明,该方案能快速准确地识别线路正常或故障状态,线路空充时可靠不误动,而空载合闸于故障时灵敏度很高,动作速度快,具有良好的工程应用前景。The rapidity of conventional switching into fault （SIF） protection is decelerated greatly because of the serious transient of unloaded switching in ultra high voltage （UHV） or extra high voltage （EHV） transmission line. Theoretical analysis shows that the impedance angles measured between switching into normal and fault state are different. Based on the comparison of the harmonic noise level under these conditions, a novel scheme of unloaded SIF protection with an assistant speedy distance relay is put forward in this paper. Analysis and mass EMTP simulation show that the scheme can distinguish fault state from normal line quickly and accurately. Accordingly it possesses a good engineering application prospect for its sensitivity and rapidity.

关 键 词：电力系统 继电保护 特高压 空载合闸 合闸于故障 

分 类 号：TM77[电气工程—电力系统及自动化]