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施工现场有时因工程施工期很短或受其它条件所限,只有三相交流电源而没有三相四线电路,在这种情况下又需安装临时照明,怎样应急处理现场照明而解决施工需要呢?处理的办法可以用三只电压为220伏且功率相等的灯泡组成一组,将三只灯泡一端接在一起,另一端分别接到三相电源上,接成星形如图所示。其道理是线电压 U_(AB)、U_(AC)、U_(BC)是380伏,灯_1、灯_2、灯_3功率相等,阻值也相等,组成了三相星形对称电路,灯_1、灯_2、灯_3两端施加的是相电压,相电压是线电压的1/3~(1/2),所以灯_1、
Sometimes due to short construction period or other conditions, the construction site may only have three-phase AC power and no three-phase four-wire circuit. In this case, temporary lighting must be installed. How to deal with the on-site lighting in an emergency? The processing method can be composed of three voltage 220 volt and equal power bulbs. Connect one end of the three bulbs together and the other end to the three-phase power supply. The reason is that the line voltages U_(AB), U_(AC), U_(BC) are 380V, and the power of lamp_1, lamp_2, lamp_3 is equal, and the resistance is also equal, which constitutes a three-phase star symmetrical circuit. The phase voltage is applied across the lamp_1, lamp_2, and lamp_3. The phase voltage is 1/3~(1/2) of the line voltage, so the lamp_1,