导线截面积与载流量的计算
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><B><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">导线截面积与载流量的计算</SPAN></B><B><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></B></FONT></P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: -24pt; mso-list: l0 level1 lfo1; tab-stops: list 42.0pt"><FONT size=3><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt; mso-bidi-font-family: 宋体"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">一、</FONT></SPAN></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一般铜导线载流量导线的安全载流量是根据所允许的线芯最高温度、冷却条件、敷设条件来确定的。 一般铜导线的安全载流量为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">5~8A/mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，铝导线的安全载流量为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">3~5A/mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> <</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">关键点</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">> </FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一般铜导线的安全载流量为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">5~8A/mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，铝导线的安全载流量为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">3~5A/mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。如：</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">2.5 mm2 BVV</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">铜导线安全载流量的推荐值</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">2.5×8A/mm2=20A 4 mm2 BVV</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">铜导线安全载流量的推荐值</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">4×8A/mm2=32A <o:p></o:p></FONT></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: -24pt; mso-list: l0 level1 lfo1; tab-stops: list 42.0pt"><FONT size=3><SPAN style="mso-bidi-font-family: 宋体"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">二、</FONT></SPAN></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">计算铜导线截面积利用铜导线的安全载流量的推荐值</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">5~8A/mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，计算出所选取铜导线截面积</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">S</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的上下范围：</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> S=< I /</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">5~8</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">>=0.125 I ~0.2 I</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> S-----</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">铜导线截面积（</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">mm2</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> I-----</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">负载电流（</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">A</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: -24pt; mso-list: l0 level1 lfo1; tab-stops: list 42.0pt"><FONT size=3><SPAN style="mso-bidi-font-family: 宋体"><SPAN style="mso-list: Ignore"><FONT face="Times New Roman">三、</FONT></SPAN></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">功率计算一般负载（也可以成为用电器，如点灯、冰箱等等）分为两种，一种式电阻性负载，一种是电感性负载。对于电阻性负载的计算公式：</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">P=UI </FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对于日光灯负载的计算公式：</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">P=UIcosф</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，其中日光灯负载的功率因数</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">cosф=0.5</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN lang=ZH-CN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> </FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">不同电感性负载功率因数不同，统一计算家庭用电器时可以将功率因数</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">cosф</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">取</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">0.8</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。也就是说如果一个家庭所有用电器加上总功率为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">6000</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">瓦，则最大电流是</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> I=P/Ucosф=6000/220*0.8=34(A) </FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">但是，一般情况下，家里的电器不可能同时使用，所以加上一个公用系数，公用系数一般</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">0.5</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。所以，上面的计算应该改写成</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman"> I=P*</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">公用系数</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">/Ucosф=6000*0.5/220*0.8=17(A) </FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">也就是说，这个家庭总的电流值为</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">17A</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。则总闸空气开关不能使用</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">16A</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，应该用大于</SPAN><SPAN style="COLOR: black; mso-bidi-font-size: 9.0pt"><FONT face="Times New Roman">17A</FONT></SPAN><SPAN lang=ZH-CN style="COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-size: 9.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的。</SPAN></FONT></P>
Re: 导线截面积与载流量的计算
谢谢楼主提供的资料。但楼主主要讲的还是家庭用导线，能否提供些详细的工业企业用导线选用方法，我想这才是大家关心的！Re: 导线截面积与载流量的计算
三相电的功率怎样计算？ 赞
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