300M距离远 大概30KW⼀380V的电机 请问要50平方的铝电缆线够吗??谢谢
推荐回答(4个)
300M距离远,大概30KW/380V的电机,50平方的铝电缆能满足使用要求。
根据功率公式P=1.732UIcosφ有:
I=P/(1.732Ucosφ)
=30/(1.732x0.38x0.85)
=54A(按三相市电计算,功率因数取0.85)
查下表,可以查得50平方铝电缆的载流量为123A,满足电流负载要求。
由于距离较远,计算电压损失:
距离:L=300米
铝线电阻率:ρ=0.0283Ωmm²/m。
电缆截面积:S=50mm²。
电缆的电阻:R=ρ×L/S=0.1698Ω
电缆的电压降为:U=IR=54X0.287=9.17v
电缆的电压损失率:10.33/380=2.4%
《城市配电网规划设计规范》规定380V电压波动要求在+5%和-7%之间,因此,50平方铝线也满足使用要求。

型 号 BLV
额定电压(KV) 0.45/0.75
导体工作温度(°C) 70
环境温度(°C) 30 35 40 30 35 40
导线排列 O-S-O-S-O
导线根数 2~4 5~8 9~12 12 以上 2~4 5~8 9~12 12 以上 2~4 5~8 9~12 12 以上
标称截面(mm2) 明敷载流量(A) 导线穿管敷设载流量(A)
2.5 24 23 21 13 10 8 7 13 9 8 7 12 9 7 6
4 32 30 28 18 14 11 10 16 12 10 9 16 12 10 9
6 41 39 36 24 18 15 13 22 17 14 12 21 15 13 11
10 56 53 49 33 25 21 19 31 23 19 17 29 21 18 16
16 76 71 66 47 35 29 26 43 32 27 24 40 30 25 22
25 104 97 90 65 48 40 36 60 45 37 33 55 41 34 31
35 127 119 110 81 60 50 45 74 56 46 42 69 51 43 38
50 155 146 135 99 74 62 56 91 68 57 51 84 63 52 47
70 201 189 175 127 95 79 71 117 88 73 66 108 81 67 60
95 247 232 215 160 120 100 90 148 111 92 83 136 102 85 76
120 288 270 250 189 141 118 106 174 131 109 98 160 120 100 90
150 334 313 290 217 162 135 122 200 150 125 112 184 138 115 103
185 385 362 335 254 191 159 143 235 176 147 132 216 162 135 121
240 460 432 400 307 230 191 172 283 212 177 159 260
如果你采用50平方的铝芯电缆是能满足你的要求。它大概能满足60KW的电机运行了
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