题目内容
发电机输出功率为100kW,输出电压为250V,用户需要220V的电压,输电线电阻为
,若输电线损失的功率为输送功率的4%,试求:
(1)输电线上的升压变压器和降压变压器原、副线圈的匝数比;
(2)用户得到的电功率是多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345518289457.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134551766411.png)
(1)输电线上的升压变压器和降压变压器原、副线圈的匝数比;
(2)用户得到的电功率是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345518289457.png)
(1)
(2)96K0057x
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345518751213.png)
(1)输电线损耗功率:P线
……………………………1分
P线
R线 …………………………………1分
输电线电流
…………………………………1分
原线圈通过的电流
………………………1分
…………………………………1分
…………………………………1分
…………………………………1分
线=U2-IR线
…………………………………1分
…………………………………1分
(2)用户得到的电功率P用=P出=P-P损
…………………………………3分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134551922772.png)
P线
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134551968344.png)
输电线电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552000673.png)
原线圈通过的电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552031758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552062995.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552109636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552140957.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552202562.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552234550.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345518751213.png)
(2)用户得到的电功率P用=P出=P-P损
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134552343615.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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