电力电缆结构尺寸计算公式

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1、GB/T12706-2008电缆假定直径的计算公式1、导体假定直径dL不考虑形状和紧压程度如何，每一标称截面积导体的假定直径（dL）由下表给出：导体截面mm2dL/mm导体截面mm2dL/mm导体截面mm2dL/mm导体截面mm2dL/mm1.51.4255.615013.863028.32.51.8356.718515.380031.942.3508.024017.5100035.762.8709.430019.5120039.1103.69511.040022.6140042.2164.512012.450025.2160045.12、绝缘线

2、芯假定直径DC*无半导电屏蔽的电缆线芯：DC=dL+2ti*有半导电屏蔽的电缆线芯：DC=dL+2ti+3.0ti-绝缘的标称厚度mm3、成缆线芯假定直径Df*所有导体标称截面积相同的电缆Df=K*DCK-成缆系数K（见下表1）*有一根小截面的四芯电缆Df=2.42（3DC1+DC2）/4*有一根小截面的五芯电缆Df=2.7（4DC1+DC2）/5*有二根小截面的五芯电缆Df=2.7（3DC1+DC2+DC3）/5其中：DC1-包括金属屏蔽层的每相绝缘线芯的假定直径mmDC2、DC3-包括绝缘层的每相小截面绝缘线芯的假定直径mm表1:绞合线芯外径

3、比例系数K芯数排列方式绞线外径比K=D/d束线外径比K=D/d中心空隙面积×d2(mm2)外层空隙面积×d2(mm2)222.02.001.571332.162.150.041.248442.422.410.2151.220552.72.70.5431.259663.01.0251.32971+63.03.001.3297*0+73.3581+73.4501.3908*0+83.6691+83.801.6799*0+94.0102+84.03.9802.27610*0+104.4113+84.00.042.593123+94.164.120.04

4、2.03912*0+125.0134+94.410.2152.553144+104.414.40.2152.025155+104.70.5432.578165+114.70.5432.071176+115.01.0252.641186+125.01.0252.13718*0+187.0191+6+125.04.9502.137201+6+135.3301.941211+7+135.3302.257221+8+135.6704.442232+8+135.6703.598242+8+146.05.9602.975253+8+146.00.043.28

5、5263+9+146.00.043.285273+9+156.156.110.042.801284+9+156.410.2153.282294+9+166.410.2152.806304+10+166.416.360.2152.806315+10+166.70.5433.319325+11+166.70.5433.319335+11+176.70.5432.864346+11+177.01.0253.398356+12+177.01.0253.398366+12+187.01.0252.927371+6+12+187.06.9302.927381

6、+7+12+187.3303.458392+7+12+187.3304.705402+7+12+197.3304.254412+7+13+197.6704.254422+8+13+197.6704.254432+8+14+298.0442+8+14+208.07.9503.774453+8+14+208.150.044.042463+9+14+208.15473+9+15+208.15483+9+15+218.158.10.042.867494+9+15+218.41504+10+15+218.41514+10+16+218.41524+10+1

7、6+228.418.353.306535+10+16+228.7545+10+17+228.7555+11+17+228.7565+11+17+238.73.301576+11+17+239.0586+12+17+239.0596+12+18+239.0601+6+12+18+239.0611+6+12+18+249.08.913.507622+6+12+18+2410.0632+7+12+18+2410.0642+7+13+18+2410.0702+8+14+20+2610.09.97753+9+15+21+2710.15410.114.300

8、804+10+16+22+2810.41410.333.881855+11+17+23+2910.74.278905+11+17+23+