85问答库 > 三相电功率的计算公式是怎么来的 三相电功率的计算公式是怎么来的 P=根号3 X UL X IL X cosy

三相电功率的计算公式是怎么来的 三相电功率的计算公式是怎么来的 P=根号3 X UL X IL X cosy

2025-04-07 07:41:10
推荐回答（1个）
回答1：

假设是Y型连接，线电压是相电压的根号三倍，线电流=相电流。给出的UL，IL,都是线电压，

P=m*U相*I相*cos(y)

m是相数。

P=3*V线/sqrt(3)*I相*cos(y)

=sqrt(3)*V线*I相*cos(y)

=sqrt(3)*VL*IL*cos(y)

当是三角形连接时，线电流是相电流的根号三倍，相电压=线电压。

P=3*V相*I线/sqrt(3)*cos(y)

不管怎么连，都是P=根号3 X UL X IL X cosy。

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