单端暂态量保护在带并联电抗器的超高压线路上的应用  

Research of application of non-unit transient protection on the ehv lines with shunt reactors

作　　者：何雷[1] 李丽平[2] 

机构地区：[1]保定学院物理系,河北保定071000 [2]河北软件职业技术学院软件工程系,河北保定071000

出　　处：《华北电力大学学报（自然科学版）》2009年第4期20-24,共5页Journal of North China Electric Power University：Natural Science Edition

摘　　要：理论分析表明,利用高低频段能量比的单端量保护可应用于带并联电抗器的超高压输电线路,且保护性能几乎不受并联电抗器的安装位置与数目的影响,在带并联电抗器的线路发生金属性故障时仍具有较高灵敏度,因此基于高低频能量比的保护应用于带并联电抗器的线路时对过渡电阻的变化不敏感。选用较高频段作为低频段时,保护性能几乎不受故障初始角及故障类型的影响。利用小波包分解作为分频手段计算高低频能量比。大量仿真实验验证了所得结论。The analysis in theory shows that the protection based on the energy ratio of a high frequency component to a low one can be applied on the EHV lines equipped with shunt reactors and its performance is hardly influenced by the number and locations of reactors. The protection has satisfactory performance to metallic short circuit faults, so the protection based on the energy ratio is immune to the different fault earth resistances. If a relatively higher frequency component is selected to be the low frequency component, the protection will be more adaptive to different fault incep- tion angles and different fault types. Wavelet packet technique is employed to determine the energy ratio. Simulations show that the conclusions drawn in this paper are correct.

关 键 词：高低频能量比 并联电抗器 单端量保护 超高压输电线路 离散Meyer小波包变换 

分 类 号：TM77[电气工程—电力系统及自动化]