150平方的电缆五百米长的压降是多少 五百米电缆电压降多少伏
\u94dd\u7535\u7f06150\u5e73\u65b9500\u7c73\u80fd\u7528\u591a\u5927\u529f\u7387\uff0c\u538b\u964d\u591a\u5c11\u5bfc\u7ebf\u9009\u5b9a\u540e\uff0c\u538b\u964d\u7684\u591a\u5c11\u53d6\u51b3\u8d1f\u8f7d\u7535\u6d41\u3002\u8d1f\u8f7d\u8d8a\u5c0f\u538b\u964d\u8d8a\u5c0f\u3002
1 150\u5e73\u65b9\u6beb\u7c73\u7684\u94dd\u7ebf500\u7c73\u7535\u963b\u662f 2.83X5/150 =0.0943\u6b27
2 \u5982\u679c\u5141\u8bb8\u538b\u964d\u662f20V 20/0.0943=212\u5b89
3 3x220X212=140KW
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\u4e94\u767e\u7c73\u7535\u7f06\u7535\u538b\u964d\u662f21.875\u4f0f\u3002
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\u7535\u963b\u662f\uff1a1.75\u00d710^\uff08-8\uff09\u00d7500\u00f7[20\u00d710^\uff08-6\uff09]=0.4375\u6b27\u59c6
U=RI=0.4375\u00d750=21.875\uff08V\uff09
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铜芯电缆的话，计算方法如下：
铜的电阻率1.72*10^-8Ω*m
500米长150mm2截面的电缆总电阻R=ρL/S=1.72*10^-8*500m/（150*10^-6）=0.057Ω
假设电压是三相380V，则每一千瓦的电流是1.52A
压降△U=IR，即每一千瓦的压降是1.52*0.057=0.0866V
铝的电阻率2.84*10^-8Ω*m，代入上面公式计算可以得出其压降是0.143V
绛旓細缁忚绠楋紝3x6+2x4mm²鍜3x10+2x6mm²鐨勫帇闄鍒嗗埆鏄24.8V鍜14.7V閮藉皬浜26.6V锛屽湪鍚堟牸鑼冨洿涔嬪唴锛屼絾鑰冭檻鍘嬮檷鏈濂藉皬浜涗互鍙婁粖鍚庣殑澧炲锛岄夋嫨3x10+2x6mm²杈冨悎閫傘傜粨璁猴細涓夌浉380V锛8500W锛鐢电紗闀500绫锛屽彲閫夋嫨VV鍨嬮摐鑺3x10+2x6mm²鐢电紗锛屽帇闄嶇害涓14.7V銆
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绛旓細鏌ュ緱150mm閾滆姱瀵间綋鐨勭洿娴佺數闃 鏈澶у兼槸0.124惟/km銆600绫抽暱鐢电紗鍦ㄦ弧杞芥椂鐨勫帇闄锛圴d锛夊鑷 鐨勭數鍘嬪亸宸 绌烘皵涓暦璁 Vd=309.5Ax锛0.124惟/kmx0.6km锛=23.0V锛屽亸宸=6.0 鍦熷￥涓暦璁 Vd=343.4Ax锛0.124惟/kmx0.6km锛=25.5V锛屽亸宸=6.7 浠庝互涓婅绠楃殑鐢靛帇鍋忓樊鍊兼潵鐪嬶紝浣庝簬鍥藉鏍囧噯瑙勫畾鐨10kV...
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