题目内容
某发电机输出功率是100kw,输出电压的瞬时值表达式为
,从发电机到用户间的输电线总电阻为8Ω,要使输电线上的功率损失为5%,需用变压器进行升压。求:
(1)发电机输出电压U1
(2)远距离的输电线路上的电流强度I线
(3)升压变压器原、副线圈匝数比n1:n2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212207737.gif)
(1)发电机输出电压U1
(2)远距离的输电线路上的电流强度I线
(3)升压变压器原、副线圈匝数比n1:n2
(1)250V
(2)25A
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212223645.gif)
(2)25A
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212223645.gif)
(1)由瞬时值表达式可得输出电压U1=250V(3分)
(2)由
(2分),得
(1分)
(3)升压变压器的输入电流:
(2分)
代入数据得:
(1分)
(2分)
代入数据得:
(1分)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212238475.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212254682.gif)
(3)升压变压器的输入电流:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212270434.gif)
代入数据得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212285785.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212301589.gif)
代入数据得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122212223645.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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