NCEES #522

[electric]

Can someone please help me with this?

Why is the stator current 1.05 angle (90 -18.19) and not 1.05 angle (-18.19)?

 

[Flyer_PE]

The 90o angle comes from the synchronous reactance. XS = 0.9 -> ZS = 0.9/90o

 

[nmh0408]

The 90o angle comes from the synchronous reactance. XS = 0.9 -> ZS = 0.9/90o

I also had a problem with this one. The best way not to miss this angel is making sure to use the reactance X with j operator and when you convert the numbers the angel will automatically be there. Remember in other cases they give you the reactance with the j operator already there, but in case “pu” values the angel is not there.