hey, i'm after a bit of help with another past exam paper question which is on the attachment along with the phase diagram i am using.
ok so im a little confused. First off are the reactances in the question supposed to be stator leakage and magnetising reactance or what? in which case is Xs= 13.05 if this is correct it says per phase and there are 3 phases so do i multiply this by 3?
which gives Xs = 39.15 ohms?
Assuming that is correct i put the values given in the question onto the phase diagram and using the cosine rule derived that jXsI = 2029 V
meaning i could say I= 2029 / Xs = 51A for 3 phase and 155A / phase?
however considering the question is worth 12 marks i am beginning to think this is wrong.
i am also guessing that the axis current is the phase current?
anyways, any help is appreciated. cheers, Lee.
ok so im a little confused. First off are the reactances in the question supposed to be stator leakage and magnetising reactance or what? in which case is Xs= 13.05 if this is correct it says per phase and there are 3 phases so do i multiply this by 3?
which gives Xs = 39.15 ohms?
Assuming that is correct i put the values given in the question onto the phase diagram and using the cosine rule derived that jXsI = 2029 V
meaning i could say I= 2029 / Xs = 51A for 3 phase and 155A / phase?
however considering the question is worth 12 marks i am beginning to think this is wrong.
i am also guessing that the axis current is the phase current?
anyways, any help is appreciated. cheers, Lee.