Detection of the real - time fundamental negative - and positive - sequence components is the key of this technique 正负序基频分量的实时快速提取,对于该方法的实际应用具有十分重要的意义。
A simple and easy operating criterion is put forward in accordance with the relation between positive - sequence component and negative - sequence component of stator current when the motor is in unbalance and single phase broken . based on analyzing the traditional inverse time - lag overloading protection of motors , an inverse time - lag operating equation with accumulating stator current is achieved , according to the differential equation of the heating and cooling while the current flows into the conductor 在分析电动机传统的反时限过负荷保护的基础上,根据导体中流过电流时的发热、散热微分方程得到了累加定子电流的反时限过负荷保护动作方程,经简化后得到累加定子电流的实用的反时限特性递推公式。