题目内容
发电站发电机端电压u=5000
sin314tV,输出功率5000kW,远距离输电线的电阻为80Ω,输电线上功率损耗要求不超过总功率的4%,求:
(1)所用升压变压器的原、副线圈匝数比多大?
(2)到达用户区使用匝数比为192:1的降压变压器,对负载电阻为10Ω的用电器供电,最多可接这样的用电器几个?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845058352.png)
(1)所用升压变压器的原、副线圈匝数比多大?
(2)到达用户区使用匝数比为192:1的降压变压器,对负载电阻为10Ω的用电器供电,最多可接这样的用电器几个?
(1) U
:U
=1:20;(2)N=192个
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845089200.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845167242.png)
(1)根据远距离输电线的电阻为80Ω,输电线上功率损耗要求不超过总功率的4%,可得I
=
=50A 则u
=
=100000V,则U
:U
=1:20,即n
:n
=1:20。
(2)根据题意可得降压变压器的次级电压为
,电阻的功率为P
=
=25KW,则N=
=192个。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845167242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845308838.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845167242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845479479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845089200.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845167242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845089200.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845167242.png)
(2)根据题意可得降压变压器的次级电压为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241338458541021.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133845932266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133846056526.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133846134881.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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