电线电缆网 > 通讯电缆 > 导体电阻的一个问题,各位有空帮忙看一下。(完整版)

导体电阻的一个问题,各位有空帮忙看一下。 - 无图版

mudong --- 2013-04-03 10:52:21

1

截面积一样的单支导体与多支导体,问什么单支的电阻要小。原理是什么?多谢!

 

fong2011 --- 2013-04-03 11:06:27

2

理论是一样的,但在实际测试时,由于多支导体间存在接触电阻,使测试出来的电阻值偏高,若在测试点做一个导体紧压,就会发现电阻更接近
moveitgogo --- 2013-04-03 11:13:01

3

截面积你确定是一样的吗?!

mudong --- 2013-04-03 11:33:29

4

是的

mudong --- 2013-04-03 11:45:06

5

举个例子:

TD:30AWG  361 ohm/km  (截面积:0.0506)

<DIV style="mso-element: frame; mso-element-frame-hspace: 9.0pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-top: .05pt; mso-height-rule: exactly">TS:30AWG  381 ohm/km  (截面积:0.0549)</DIV><DIV style="mso-element: frame; mso-element-frame-hspace: 9.0pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-top: .05pt; mso-height-rule: exactly"> </DIV><DIV style="mso-element: frame; mso-element-frame-hspace: 9.0pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-top: .05pt; mso-height-rule: exactly">多支导体截面积大,反而电阻更大。</DIV><DIV style="mso-element: frame; mso-element-frame-hspace: 9.0pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-top: .05pt; mso-height-rule: exactly"> </DIV><DIV style="mso-element: frame; mso-element-frame-hspace: 9.0pt; mso-element-wrap: around; mso-element-anchor-vertical: paragraph; mso-element-anchor-horizontal: column; mso-element-top: .05pt; mso-height-rule: exactly">多谢!</DIV>
mudong --- 2013-04-03 11:47:12

6

30AWG  361 ohm/km  (截面积:0.0506)

TS:30AWG  381 ohm/km  (截面积:0.0549)

多支导体截面积大,反而电阻更大

多谢!

mudong --- 2013-04-03 11:58:22

7

问一下二楼大仙,这个接触电阻是什么东西,它是怎么产生的?

 

huye666 --- 2013-04-03 23:09:07

8

这个接触电阻是什么东西,它是怎么产生的?
chenlin11 --- 2013-04-06 20:58:38

9

电桥测量的电阻是,夹具接触的点?请问,测量导体电阻时,若中间有断丝,缺丝现象,能发现吗?
phyhan --- 2013-04-07 17:06:32

10

串并联吧?
txy541 --- 2013-04-08 08:55:42

11

chenlin11 --- 2013-04-08 22:05:09

12

还没解决呢,,顶顶
mudong --- 2013-04-09 11:50:07

13

顶一顶

mudong --- 2013-04-16 10:44:40

14

还请各位大佬帮忙解疑

suby --- 2014-03-16 20:16:09

15

查看电力电缆设计中直流电阻的计算公式就可以知道,绞合导体的话,要乘以绞合系数。
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