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3 Phase unbalanced load AC electronics question. 
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#1
Nov1609, 12:49 AM

P: 51

1. The problem statement, all variables and given/known data
This is a past exam questions which I am doing as revision, now I am confused about how to calculate the answers. 3. The attempt at a solution I have tried using millmans theorem which is Vsn = (Van/Za + Vbn/Zb + Vcn/Zc) / (1/Za + 1/Zb + 1/Zc) Assuming the following: Van = 240v @ 0 degrees Vbn = 240v @ 120 degrees Vcn = 240v @ 120 degrees As complex impedances: Van = 240 Vbn = 195 + 139i Vcn = 195  139i Za = 10 Zb = 15 Zc = 20i Vsn = 273 +32i Vsn = 275v @ 6.6degrees Now I feel like I am really guessing here and have no idea if what I have done is correct (I don't think it is) so any help would be greatly appreciated For the currents it is just Ia = Van/Za = 240/10 etc which is easy and then you can easily construct the phasor diagram as well from these. Either way I don't think my values for Van, Vbn, Vcn or my method for calculating Vsn is correct. 


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