新型阻抗选相方法  

Research on the New Phase Selector Based on Impedance Measurement

作　　者：陈朝晖 黄少锋[1] 陶惠良[2] 杨奇逊[1] 

机构地区：[1]华北电力大学四方研究所,北京市102206 [2]北京四方继保自动化股份有限公司,北京市100085

出　　处：《电力系统自动化》2005年第3期51-56,共6页Automation of Electric Power Systems

摘　　要：针对现有阻抗选相方法存在的误选相问题,提出了一种适用于微机保护的新型阻抗选相方法。该方法利用了单相测量阻抗、相间测量阻抗以及故障前负荷阻抗负荷状态下阻抗继电器的测量阻抗的幅值大小关系以及3个单相测量阻抗的相位关系进行比较。仿真计算表明,新的阻抗选相方法在高阻接地、弱馈等故障情况都有很好的选相能力,适于作为线路保护稳态故障选相元件。In order to solve the mal-operational problem of the traditional impedance based phase selector, a new method for phase selection in microprocessor-based protective relaying is presented. The relationship between the magnitude and phase angle of the fault impedance and the load impedance are used for comparison. Its response to a number of fault conditions such as high impedance ground fault or fault in weak infeed system are verified by the simulation tests. The results show that the new method is suitable for the fault phase selection element based on steady state fault component in the EHV line protective relaying.

关 键 词：线路保护 选相元件 测量阻抗 

分 类 号：TM773[电气工程—电力系统及自动化]