题目内容
(9分)发电机输出功率40Kw,输出电压400V,用变压比(原、副线圈匝数比)为1∶5的变压器升压后向远处供电,输电线的总电阻为5Ω,到达用户后再用变压器降为220V,求:(1)输电线上损失的电功率是多少?(2)降压变压器的变压比是多少?
(1)2000W
(2)95:11
(2)95:11
设升压变压器的的输出电压为U1,输入电压为U2,输入电流为I;降压变压器的输出电压为U3,输入电压为U4
(1)
①![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121803980855.gif)
②
③ ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804026880.gif)
损失的功率:
④
(2)损失的电压:
⑤
⑥
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804089860.gif)
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121803964494.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121803980855.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121803995339.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804011280.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804026880.gif)
损失的功率:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804042724.gif)
(2)损失的电压:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804058629.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804089771.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121804089860.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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