在三相电路中,只要有一部分不对称,如出现电源不对称,或电路参数(负载)不对称就称为不对称三相电路。日常照明线路由于用电不均匀,易出现三相不对称状态。假定中性线阻抗为零,则电源中性点与负载中性点间的电压为零,因此,每相负载上的电压一定等于该相电源电压,各相负载电压与各相负载阻抗大小无关。由此可见,在中性线及线路阻抗为零的三相四线制电路中,当三相电源电压对称时,即使三相负载不对称,三相负载上的电压依然是对称
电力有源滤波器能动态补偿不对称三相电路的畸变电流、负序电流分量。
Active power filter can compensate current components which include distortion and negative sequence current components when it is used in unbalanced three-phase circuit.
利用等效电路,分析了三相异步电动机在不对称电压下的性能和对电机的危害。
By applying equivalent circuits, this paper has analyzed three-phase asynchronous motor property and the harm to generator under asymmetrical voltage.
基于上述三相交流电弧炉电路模型,分析了电流不对称和阻抗不对称对电弧功率的影响,并讨论了交流电弧炉三相电参数互相影响的复杂性。
The influences of the asymmetry of current and impedance on the arc voltage and power were analyzed, and the investigation complexity was also discussed.
应用推荐