有功功率、无功功率和视在功率计算公式

1. 有功功率

其中分别是各相负载相电压与相电流之间的相位差。

如果三相电路对称，则各相负载的有功功率相等，故有文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

                      （1）文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

式中为一相负载的有功功率。文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

                      （2）文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

式中为负载相电压与相电流之间的相位差，也等于负载阻抗角。文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

2.   无功功率

电路对称时，则为文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

       （3）文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

3. 视在功率

电路对称时，则为文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

                                         （4）文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

4. 功率因数

                                          （5）文章源自公式库网-https://www.gongshiku.com/html/201808/yougonggongshuaiwugonggongshuaiheshizaigongshuaijisuangongshi.html

电路对称时，，为一相负载的功率因数。