Measures, such as the floating of threshold, braking by positivesequencecurrent, driving up the threshold during power swing, etc are suggested to prevent th.
采用浮动门槛、正序电流制动和静稳破坏后提高动作门槛值的方法，来防止系统振荡时误启动。
2
In the paper, the reduced single phase short-circuit current equation expressing as positivesequence impi dance only is showed.
文中还提出了低压系统中只用正序阻抗表达的单相短路电流的简化计算公式。
3
Based on the symmetry component theory, a method of the motor protection is presented by measuring positive, negative and zero sequencecurrent component.