400米50平方的三芯电缆，电压380，电流150A，压降有多少，就是电缆的另一端电压下降多少？ 请教电压降是多少,该采用多大的电缆?
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电缆的另一端电压降：△U=0.144*150=21.6V
从分电箱接380v电， 400米电缆的另一端的实际电压：U实=U-△U=380-21.6=358.4V
铜线电阻 R＝ρ(L/S)=0.017X400/50=0.136Ω
压降=IR=150X0.136=20,.4V
下降20V左右，勉强可以使用。
铝线电阻 R＝ρ(L/S)=0.029X400/50=0.232Ω
压降=IR=150X0.232=34.8V
下降35V左右，不能使用。
你的材质没有给出来,不好算,,,你可以用电流的平方乘以400米电线的电阻可以得到,,,,
电线的电阻可以这样算:R=ρL / S ρ为材料的电阻率,可以查表得到,L为导线长度单位为米,S为导线截面积单位为平方米..祝你快乐.
铜线340
铝线310
绛旓細400绫50骞虫柟鐨勪笁鑺摐鐢电紗锛岀數闃绘槸锛歊=0.018*400/50=0.144娆 鐢电紗鐨勫彟涓绔數鍘嬮檷锛氣柍U=0.144*150=21.6V 浠庡垎鐢电鎺380v鐢碉紝 400绫崇數缂嗙殑鍙︿竴绔殑瀹為檯鐢靛帇锛歎瀹=U-鈻砋=380-21.6=358.4V
绛旓細50骞虫柟鐨閾鐢电嚎400绫筹紝瀵肩嚎鐢甸樆 R锛澫(L/S)=0.017X400/50=0.136惟 鍏佽涓嬮檷鐨勭數鍘嬩负20V 鑳芥壙杞界殑鏈澶х數娴両=20/0.136=147A 50骞虫柟鐨勯摑鐢电嚎400绫筹紝瀵肩嚎鐢甸樆 R锛澫(L/S)=0.029X400/50=0.0.232惟 鍏佽涓嬮檷鐨勭數鍘嬩负20V 鑳芥壙杞界殑鏈澶х數娴両=20/0.232=86A 70骞虫柟鐨勯摐鐢电嚎400...
绛旓細璁＄畻杩囩▼濡備笅锛50骞虫柟鐨閾鐢电嚎400绫筹紝瀵肩嚎鐢甸樆 R锛澫(L/S)=0.017X400/50=0.136惟锛屽厑璁镐笅闄嶇殑鐢靛帇涓20V锛岃兘鎵胯浇鐨勬渶澶х數娴両=20/0.136=147A锛50骞虫柟鐨勯摑鐢电嚎400绫筹紝瀵肩嚎鐢甸樆 R锛澫(L/S)=0.029X400/50=0.0.232惟 锛屽厑璁镐笅闄嶇殑鐢靛帇涓20V锛岃兘鎵胯浇鐨勬渶澶х數娴両=20/0.232=86A銆
绛旓細50骞虫柟鐨閾鐢电嚎400绫筹紝瀵肩嚎鐢甸樆 R锛澫(L/S)=0.029X400/50=0.0.232惟 鍏佽涓嬮檷鐨勭數鍘嬩负20V锛岃兘鎵胯浇鐨勬渶澶х數娴両=20/0.232=86A 50骞虫柟鐨勯摐鑺嚎鑳芥壙鍙楀澶х殑鐢垫祦 鐜板湪50骞虫柟鐨勯摐鑺嚎鑳芥壙鍙185A鐨勭數娴併50骞虫柟鐢电嚎閾滆姱绾跨殑瀹夊叏鐢垫祦鏄185A锛岄摑鑺嚎鐨勫畨鍏ㄧ數娴佹槸140A涓鑸摐绾垮畨鍏ㄨ绠楁柟娉曟槸锛 &...
绛旓細147A鎴栬86A鐨勭數娴併傝绠楄繃绋嬪涓嬶細50骞虫柟鐨閾鐢电嚎400绫筹紝瀵肩嚎鐢甸樆R锛澫(L/S)=0.017X400/50=0.136惟锛屽厑璁镐笅闄嶇殑鐢靛帇涓20V锛岃兘鎵胯浇鐨勬渶澶х數娴両=20/0.136=147A锛50骞虫柟鐨勯摑鐢电嚎400绫筹紝瀵肩嚎鐢甸樆R锛澫(L/S)=0.029X400/50=0.0.232惟锛屽厑璁镐笅闄嶇殑鐢靛帇涓20V锛岃兘鎵胯浇鐨勬渶澶х數娴両=20/0.232...
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