TSXCAY41

TSXCAY41 补偿电容器的选用

1、补偿电容量的计算

要把感性负载的功率因数从cosφ₁提高到cosφ需并联的电容量C可按下式求得，即

C=(Ptgφ₁-Ptgφ)/ωU²=P (tgφ₁-tgφ)/ωU²

例:已知220V、40W的日光灯工作时的电流为0.4A，cosφ=0.545。镇流器取用的功率为8W。现要将功率因数补偿到0.9，应并联多大的电容。

解:根据已知条件可求得:

tgφ₁=1.54，tgφ=0.484，日光灯电路取用的功率P=40+8=48W

C==P (tgφ₁-tgφ)/ωU²=48×(1.54-0.484)/314x220^2^

=3.34×10^-6^F=3.34μF

即为使日光灯电路的功率因数提高到0.9，应并联一个额定电压U=220V，C=3.34μF的电容器。

注意:在功率因数补偿的过程中，负载所取用的有功功率P，无功功率Q和cosφ仍保持不变，而改变的仅仅是电路总的无功功率和总的功率因数。

2、电容器电压的选择

选用并联补偿电容器时，不仅要选用容量的电容器，还使所选用的电容器的额定电压大于或等于电路的工作电压，否则电容器将被击穿。

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TSXCAY41