電線電纜常用計(jì)算公式

1、 導(dǎo)電線芯一、導(dǎo)電線芯及裸導(dǎo)體制品圓單線的截面和重量的計(jì)算圓單線的截面和重量的計(jì)算（1）單一材料的圓單線：截面F=0.25*d2 （mm2）重量W=F*r=0.25*d2*r （kg/km）W銅=6.982d2 （kg/km） W鋁=2.121d2 （kg/km） W鋼=6. .126d2 （kg/km）F-圓單線截面積mm2 W-導(dǎo)線重量kg/kmd-圓單線直徑mm r-所用材料比重g/cm3（2）雙金屬線: 1)重量系數(shù)法: W2=W1*K W2錫=W1銅*K=6.982d2 *K 2)綜合比重法: W2=0.25*d2*r2*(r-r1)/(r2-r1) W2-鍍層材料重量kg/km K

2、-鍍層的重量系數(shù) d-鍍層單線的直徑mm r-有鍍層材料的比重g/cm3 r1-內(nèi)層材料的比重g/cm3 r2-鍍層材料的比重g/cm3 K值見下表線徑(mm)K線徑(mm)K0.08-0.140.05250.85-0.950.01530.15-0.190.03660.96-1.100.01430.20-0.240.03041.11-1.350.01380.25-0.290.02681.36-1.670.01170.30-0.360.02401.68-1.750.01040.37-0.390.02201.76-1.810.01010.40-0.470.02021.82-2.000.00970.

3、48-0.590.01982.01-3.510.00880.60-0.730.01783.52及以上0.00780.74-0.840.0165導(dǎo)電線芯二、絞線絞合線芯的結(jié)構(gòu)計(jì)算絞合線芯的結(jié)構(gòu)計(jì)算1）線芯按正規(guī)絞合時(shí)總根數(shù)中心層根數(shù)按正規(guī)絞合時(shí)總根數(shù)備注123456Z=1+3n（n-1）Z=（3n-1）nZ=3n2Z=（3n+1）nZ=（3n+2）nZ=3n（n+1）n-層數(shù)（包括中心層n為1）Z-絞合線芯根數(shù)2）線芯絞合外徑計(jì)算(1)按正規(guī)絞合時(shí)，中心為1-6根，線芯外徑比M的計(jì)算按表1絞合線芯外徑比M可查表2計(jì)算中心線根數(shù)外徑比M中心線根數(shù)外徑比M123M=2n-1M=2nM=2n+0.15

4、4456M=2n+0.414M=2n+0.7M=2n+1(2)非正規(guī)絞合時(shí),線芯外徑比M的計(jì)算: M=D/d=d1+1/sin(1800/Z)/d=1+1/sin(1800/Z)(3)線芯外徑： D=M*dZ-外層根數(shù)d-單線直徑mmn-層數(shù)總根數(shù)結(jié)構(gòu)形式外徑比M總根數(shù)結(jié)構(gòu)形式外徑比M222134+94.414332.154144+104.414442.414155+104.7552.7165+114.7663170+6+11571+63180+6+12581+73.3191+6+12591+83.7201+6+135.154102+84211+7+135.3113+84.154221+8+1

5、35.7123+94.154232+8+136D-線芯直徑mm M-外徑比總根數(shù)結(jié)構(gòu)形式外徑比M總根數(shù)結(jié)構(gòu)形式外徑比M242+8+146382+6+12+188253+8+146.154391+7+13+187.3263+9+146.154392+7+12+188273+9+156.154401+7+13+197.3284+9+156.414402+7+12+198294+9+166.414412+7+13+198304+10+166.414422+8+13+198315+10+166.7432+8+14+198325+11+166.7442+6+14+208335+11+176.7453+8

6、+14+208.154346+11+177.0463+9+14+208.154356+12+177.0473+9+15+208.154366+12+187.0483+9+15+218.154371+6+12+187.0494+9+15+218.414381+7+12+187.3504+10+15+218.414總根數(shù)結(jié)構(gòu)形式外徑比M總根數(shù)結(jié)構(gòu)形式外徑比M514+10+16+218.414596+12+18+239.0524+10+16+228.414606+12+18+249.0535+10+16+228.7611+6+12+18+249.0545+10+17+228.7622+6+12+18

7、+2410555+11+17+228.7632+7+12+18+2410565+11+17+238.7631+7+13+18+249.3576+11+17+239.0642+7+13+18+2410586+12+17+239.0911+6+12+18+24+30113）復(fù)絞線外徑計(jì)算：D=M*d 其中：M-外徑比（見下表）d-單絲外徑mm復(fù)絞線外徑比復(fù)絞線結(jié)構(gòu)（股數(shù)/單線根數(shù)/單線直徑）外徑比M復(fù)絞線結(jié)構(gòu)（股數(shù)/單線根數(shù)/單線直徑）外徑比M4/19/d11.9619/7/d14.76/19/d14.7619/10/d19.367/7/d8.80319/11/d19.927/11/d12.211

8、9/13/d21.327/12/d12.2119/14/d21.357/14/d12.9619/15/d22.297/19/d14.7619/17/d24.427/27/d18.1619/18/d24.587/32/d19.2319/22/d27.3812/7/d12.2219/26/d30.1114/7/d12.9619/27/d30.1114/9/d15.5419/37/d34.25復(fù)絞線結(jié)構(gòu)（股數(shù)/單線根數(shù)/單線直徑）外徑比M復(fù)絞線結(jié)構(gòu)（股數(shù)/單線根數(shù)/單線直徑）外徑比M27/7/d17.9637/19/d34.4127/16/d27.5437/21/d35.4227/18/d30.7348/7/d23.8927/49/d48.7348/19/d40.0530/19/d31.5752/19/d41.39