异步电动机的无功就地动态补偿

详细论述了运用数字电子技术对异步电动机无功就地动态补偿的理论依据和实施步骤。异步电动机的功率因数随负载的变动而变化 ,欲使异步电动机功率因数保持0 .95,需要及时投切补偿电容器。无功补偿电容量与不同负载时定子相电流与相电压的相位差角有一一对应的关系 ,只要测得不同负载时定子相电流与相电压的相位差角 ,就可以确定相应的无功补偿电容量的大小。采用七位加法计数器测得线电压和线电流过零值点的时间差 ,由此就可以确定相电流与相电压的相位差角 ,从而及时投切相应的补偿电容。

The Dynamic Reactive Power of Induction Motor in the Locality

The paper discussed the theory basis and implementing steps of the dynamic reactive power compensation in the locality by using digit election technology.For the power factor of induction motor varies with load,in order to make the power factor keep over 0.95,it is necessary to switch on the compensation capacitor.the compensation capacitance quantity and the phasic angle dispatch of stator phasic current and voltage when the load is different,have a relation of 1∶1.Therefore,as long as the angle is measured,the compensation capacitance quantity can be confirmed.Measuring the time dispatch of circuit current and voltage,when they are zero,can confirm the phasic angle dispatch;thereby,the compensation capacitor can be switch on.