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銅電纜與鋁合金電纜的電能損耗

time:2019-05-08 15:06:04
電纜線路的損耗計算公式:三相線路中有功及無功功率損耗計算公式為:

有功功率損耗  △PL=3I2jsR/103 (KW);

無功功率損耗  △QL=3I2jsX/103 (kvar)。

R——每相線路電阻(Ω),R=R’L;

X——每相線路電抗(Ω),X=X’L; 

L——線路計算長度(KM);

 Ijs ——計算相電流(A); 

R’、X’——線路單位長度的交流電阻及電抗(Ω/km)。

我們以400V供電線路,三相負載平衡、線路電流為電纜在空氣中敷設的安全載流量、功率因數取0.8,線路長度為100米建立模型。

由上表可知,在相同的運行電流情況下,銅電纜與放大截面的鋁合金電纜在線路損耗(或電能損耗)方面基本一致。

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