在660V电压下,如何计算过流整定?短路整定?

1个回答

  • 132KV的负荷功率应该是132KW.电压损失率与电缆材质、负荷率、功率因数等有关.

    聚氯乙烯绝缘70平方的铝芯电缆,在功率因数为0.5,0.6,0.7,0.8,0.9,1.0时,电压损失率为0.144,0.166,0.186,0.200,0.225,0.264.(%/A.km)

    聚氯乙烯绝缘70平方的铜芯电缆,在功率因数为0.5,0.6,0.7,0.8,0.9,1.0时,电压损失率为0.097,0.109,0.120,0.111,0.125,0.139.(%/A.km)

    功率因数为0.9来计算,电流为211A,用铝芯线,电压损失(电压降)47V,

    用铜芯,电压损失(电压降)26.4V.

    三相负荷:P=根号3UI,I=P/根号3U=132/(1.732*0.66)=115.47A

    压降U=IR=115.47*R,R自己测一下