超高压输电线路新型单端超高速保护研究  

A Novel Ultra-High Speed Non-Unit Protection for EHV Transmission Line

作　　者：哈恒旭[1] 张保会[1] 吕志来[1] 吕延洁[1] 

机构地区：[1]西安交通大学电气学院,陕西西安710049

出　　处：《电力自动化设备》2001年第4期6-9,共4页Electric Power Automation Equipment

基　　金：中华电力基金和许继奖教金课题资助金资助

摘　　要：提出了一种基于小波框架理论的新型暂态量保护原理 ,利用单端暂态电流的能量突变 ,检测故障发生作为保护的启动元件 ,利用一个时间段内不同频率分量的衰减程度来区分区内和区外故障 ,大大提高了暂态量保护的可靠性 ;为了解决电压接近零点故障时灵敏度下降问题 ,利用暂态电流信号奇异点 (突变点 )的奇异性不同作为区分区内、区外故障的辅助判据。Based on wavelet frame theory, a new principle of transient protection is proposed, which applies the energy mutation of non unit transient current to detect the occurrence of fault as the actuating component of protection. By using the energy descent rates of different frequencies during a certain period to distinguish internal and external faults, the transient protection reliability increases. In order to solve the low sensitivity problem for the fault occurred when voltage approaches zero, the lipschiz degree at singularity point is used as an additional criterion to distiinguish internal and external faults, and the protection speed and reliability are improved.

关 键 词：超高压输电线路 单端超高速保护 水波理论 奇异度 暂态量保护 

分 类 号：TM726.1[电气工程—电力系统及自动化] TM863