功率因数是负值,是什么意思?

来源:百度知道 编辑:UC知道 时间:2024/06/16 00:45:34
电压比电流超前的角度为功率因数角。
功率因数=功率因数角的余弦。

功率因数又等于 无功功率除以视在功率;

感觉功率因数和机械效率有些相近,应该是大于等于0的数,怎么功率因数还能是负值呢?

功率因数角的取值范围是什么样的?对应的角度又各自是什么情况?

谢谢指教

显示功率因数时,负值为电流超前

If you does not mean the display problem
that may cuased by there are power supply in your load.

for example
your input voltage is v*sin(x),
there is another voltage source in your load v*sin(x-pi)-v*sin(x)
the whatever pf you can get at the terminal.

I think power electronics devices affect the grids may have this kind of effect

过补了