synchronous machines

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Rei

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I have a little trouble finding the current in a given synchronous machine. I always get the angle value wrong. See below examples.

20deg.JPG

solution used Eo=13.16<20deg and E=11<0deg

20deg.JPG

solution used Eo=1790<-30deg and E=2300<0deg.

How do you know which angle is which?

 
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