距离保护特性元件躲过渡电阻能力分析与研究

对距离保护元件,由于存在过渡电阻,单侧电源线路经短线路出口故障或双侧电源的线路故障,容易引起距离保护拒动或误动。分析了过渡电阻对距离保护工作的影响,探讨了接地及相间距离继电器这种受过渡电阻影响较大的元件阻抗圆特性躲过渡电阻能力改进,以及几种较好的躲过渡电阻特性,指出将这些特性组合起来将具有很好的躲过渡电阻的能力。

Analysis and research on the ability of distance protection element standing the influence of transition resistance

To distance protection elements, the existence of transition resistance may result in tripping missing or maloperation,when fault happens at the exit of short line of one-terminal power supply or on the line of two-terminal power supply.In view of that, the paper analyses the influences of transition resistance to distance protection, discusses the improvement of impedance circle characteristics of grounded distance relay and interphase distance relay whose standing transition resistance ability is inferior, and presents several impedance circle characteristics with better standing transition resistance ability. The paper draws a conclusion that distance protection will possess better standing resistance ability when the characteristics mentioned above combined together.