圆特性阻抗元件动态工作特性分析

Analysis on Dynamic Characteristic of Circular Characteristic Impedance Component

分析了我国目前广泛应用的普通圆特性方向阻抗元件的动态工作特性和工频变化量阻抗元件的工作特性。正方向保护区内故障,两阻抗元件的动态特性都包括坐标圆点,即无死区。反方向故障,普通方向阻抗元件的动态工作特性抛向第Ⅰ象限;而工频变化量阻抗元件的工作特性应抛向第Ⅲ象限,反方向故障阻抗保护有选择的不动作。

This thesis tries to give an analysis on dynamic characteristics of characterstic circle impedance components and power frequency variation quantity impedance component, which are currently widely used in China. As the fault point is within the protected zone and at forward direction, these two impedance components characteristic circles include the origins of coordinate, which means there is no dead zone. For backward fault, the dynamic characterisitic of common directional impedance component will displace to the first quadrant but that of the power frequency variation quantity impedance component will displace to the third quadrant and has selectivity and do not act.