15问答网 > 40平方的铝线离变压器500米末端电压多少

40平方的铝线离变压器500米末端电压多少

2025-03-28 11:12:24
推荐回答（2个）
回答1：

已知：S=40mm2（铝线），L=500m ，ρ=0.0315Ω.㎜2/m ， P=15kw COSφ=0.8（理论）U=400V
求；I=P/√3 U线COSφ =15*1000/1.732*400*0.8=15000/554.24=27.06A
解；R=ρL/S=0.0315*500/40=0.394Ω
根据欧姆定律公式： △U=IR=27.06*0.394=10.66V=11v 400-11=389v
答；理论计算15kw满载时末端电压389v 电压（降）损失11v。

回答2：

变压器的出口端电压多少？

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