题目内容
如图4-1-16所示三相供电线路,接入三相电灯负载,线电压为380 V,每相负载电阻500 Ω,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206501522190.jpg)
图4-1-16
(1)如果A相断开,其他两相电灯的电压和电流.
(2)如A相短路而熔断器未熔断,其他两相电灯的电压和电流.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206501522190.jpg)
图4-1-16
(1)如果A相断开,其他两相电灯的电压和电流.
(2)如A相短路而熔断器未熔断,其他两相电灯的电压和电流.
(1)190 V 0.38 A
(2)380 V 0.76 A
(2)380 V 0.76 A
(1)如果A相断开,那两个灯泡就串联接在两个端线之间,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650168924.png)
="190" V
A=0.38 A
(2)A相短路而熔断器未熔断,电灯的电压为线电压:
="380" V=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650308412.png)
A=0.76 A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650168924.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650214409.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650230866.png)
(2)A相短路而熔断器未熔断,电灯的电压为线电压:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650261500.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650308412.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120650355906.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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