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.
出处
《电力系统自动化》
EI
CSCD
北大核心
2005年第3期51-56,共6页
Automation of Electric Power Systems
关键词
线路保护
选相元件
测量阻抗
Computer simulation
EHV power transmission
Electric grounding
Electric impedance measurement
Microprocessor chips
Relay protection
Transmission line theory
