急急急!电缆够粗了吗?

2024-11-19 23:13:50
推荐回答(6个)
回答1:

先估算电压损失。
380/220V配电线路电压损失的简易计算:
ΔU%=M÷(C×S)
M—总负荷矩(kW•m),如题,假设负荷在末端,
M=250×200(kW•m);
S—导线截面(mm2),如题S=185;
C—电压损失计算系数,三相四线,铜芯导线,C=70,铝芯导线,C=41.6。
(引自《电工计算应用280例》,P.46)

该题,经计算得配电线路电压损失
ΔU%=(250×200)÷(70×185)=3.9,
线路电压损失没问题。

再核查导线的安全载流量,
查表可得,VV 185四芯电缆,25℃时的安全载流量为341A,
如果所有的负荷不会同时使用,根据设备的需要系数得到的计算负荷不超过170kW,该电缆能安全使用,
如果250kW的设备需同时使用,该电缆的截面不够,建议用VV 240 单芯3根+120 1根,明敷。
VV 240 单芯25℃时的安全载流量为552A。

(数据引自《输配电速查速算手册》,P.163)

回答2:

250kw差不多500多个电流,185的电缆虽然稍小了点,但250KW是安装负荷,所以电缆时可以用的.

回答3:

看你用电的距离,远点就用8平方,近的话8.8够了,都是铜线啊,呵呵,不过现在的奸商多,好多不够流量,买的时候注意哈。主要看线芯大小。

回答4:

两根3×150+1×70的铜电缆

回答5:

可选1kV VV 单芯 240mm2

可选1kV VV 单芯 300mm2

(铜芯)

回答6:

185的四芯铜线电缆安全载流量才396A,而楼主的输电功率为250KW,三相有功电流达500A(还不包括无功电流),还有200米的距离,因此太小了,如一定用电缆的话应用3*300+1*120的电缆才安全,用单芯铜电缆可用240平即可,还节约银子

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