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。
Measures, such as the floating of threshold, braking by positive sequence current, driving up the threshold during power swing, etc are suggested to prevent th.
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。
In the paper, the reduced single phase short-circuit current equation expressing as positive sequence impi dance only is showed.
应用瞬时值对称分量变换，可提取电压、电流故障分量的正序空间向量。
The transformation of the instantaneous value symmetry component applied, the positive sequence space vector of fault component of the voltage and current can be derived.
论述了利用瞬时无功功率理论从三相不对称电流中正确检测出三相正序有功电流，并用计算出的指令电流对系统进行补偿的原理。
Based on the instantaneous reactive power theory the method correctly detects the active positive-ord current from unsymmetrical currents and applies calculated command current to compensate system.
基于高压输电线路的分布参数模型，使用线路两端电压、电流的正序和负序分量，对高压输电线路两点异相故障提出了一种新的测距算法。
Based on the distributed parameter model for transmission line, a new fault location method for short circuit fault of two points on different phases of the power transmission line is presented.
基于对称分量法理论，提出了基于检测正序、负序、零序电流分量的电动机保护方法。
Based on the symmetry component theory, a method of the motor protection is presented by measuring positive, negative and zero sequence current component.
第二种控制策略中，输入电流矢量根据输入电压正、负序成分进行动态调制。
In the second one, the input current displacement Angle is dynamically modulated as a function of positive-and negative-sequence components of the input voltages.
介绍了一种利用电动机正、负序等效电流实现电动机热过载保护的方法，给出了保护动作的数学模型、离散算法及其计算机实现方法。
A thermal overload inverse time equation that is quite close to the real thermal locus of motor and its implementation method are proposed based on the thermal characteristic of motor.
介绍了一种利用电动机正、负序等效电流实现电动机热过载保护的方法，给出了保护动作的数学模型、离散算法及其计算机实现方法。
A thermal overload inverse time equation that is quite close to the real thermal locus of motor and its implementation method are proposed based on the thermal characteristic of motor.
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