变压器额定电流计算公式

变压器额定电流计算公式

电流是电荷的定向移动，单位为安培（A）。

欧姆定律

$I = \frac{U}{R}$文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html

功率求电流

单相：$I = \frac{P}{U\cos\varphi}$文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html

三相：$I = \frac{P}{\sqrt{3}U\cos\varphi}$文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html

电动机额定电流

$I = \frac{P}{\sqrt{3}U\cos\varphi\eta}$文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html

$\eta$ — 效率，$\sqrt{3} ≈ 1.732$。文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html

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

⚡ 三相多出 $\sqrt{3}$ 因子。文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html 文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html文章源自公式库网-https://www.gongshiku.com/html/201808/bianyaqiedingdianliujisuangongshi.html