基于负序电压极化的自适应阻抗继电器研究

Study on adaptive impedance relay based on negative sequence voltage polarization

提出了一种基于负序电压极化的自适应接地阻抗继电器方案,并对其动作特性进行了分析。该继电器可根据接地电阻的大小自动调整继电器的动作边界,对接地电阻有极强的自适应能力。同时,继电器不存在动作的“电压死区”,具有明确的方向性。通过Matlab仿真分析结果证明,该继电器具有优良的动作特性,在500kV的高压线路上有良好的耐受过渡电阻能力。

An adaptive impedance relay based on negative sequence voltage polarization is proposed,and its operating characteristic is analyzed. Its protective zone is adaptively changed according to different earth-fault resistance. There is no operative ＂voltage dead zone＂,and the definite directionality exists. Simulative analysis with Matlab proves its good operating characteristic and strong adaptability to earth resistance on 500kV line.