Detection of the real - time fundamental negative - and positive - sequence components is the key of this technique 正負(fù)序基頻分量的實(shí)時(shí)快速提取,對(duì)于該方法的實(shí)際應(yīng)用具有十分重要的意義。
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 在分析電動(dòng)機(jī)傳統(tǒng)的反時(shí)限過(guò)負(fù)荷保護(hù)的基礎(chǔ)上,根據(jù)導(dǎo)體中流過(guò)電流時(shí)的發(fā)熱、散熱微分方程得到了累加定子電流的反時(shí)限過(guò)負(fù)荷保護(hù)動(dòng)作方程,經(jīng)簡(jiǎn)化后得到累加定子電流的實(shí)用的反時(shí)限特性遞推公式。