补偿电压突变量方向判别元件的健全相动作特性研究

在分析了基于补偿电压突变量方向判据动作特性的基础上,深入讨论了按相构成的方向判据健全相的动作特性。指出在某些系统工况和故障情况下,该保护原理可能存在的不足,并根据健全相与故障相电压突变量幅值变化大小关系提出相应的解决方案,即裕度门槛的自适应整定方法。解决了该元件需要与选相元件配合才能实现超高压线路选相跳闸的不足,不仅实现了各种故障情况下的方向判别,而且能够正确选相,使补偿电压突变量方向元件的优势得以充分发挥。并对该方法进行了仿真验证。

Study on sound phase operating characteristic of directional protective relaying based on fault component compensating voltage

Based on analysis of characteristic of fault directional discriminating criteria based on superimposed component of compensation voltage,sound phase operating characteristic of phase-based criteria is analyzed.Weakness of this directional discrimination under some operating mode and fault is pointed out.According to the amplitude relationship of superimposed component of sound phase and fault phase,self-adaptive setting method of the margin threshold is proposed,which makes the direction discrimination could be used as a phase-selection component as well as a direction component,at the same time makes full use of the dominance of the direction discriminating criteria.The simulation and analysis of presented scheme is introduced.