功率因数符号及功率因数计算公式

功率因数符号及功率因数计算公式

功率因数是 $\cos\varphi$，等于有功功率与视在功率之比。

定义

$\cos\varphi = \frac{P}{S} = \frac{P}{\sqrt{P^2+Q^2}}$文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html

三相功率

$P = \sqrt{3}UI\cos\varphi$文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html

$Q = \sqrt{3}UI\sin\varphi$文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html

文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html

⚡ 功率因数越低线路损耗越大。文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html 文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html文章源自公式库网-https://www.gongshiku.com/html/201808/gongshuaiyinshufuhaojigongshuaiyinshujisuangongshi.html