Recent content by mpar3

Hi sorry I've been away so long, things have been manic here. I can see my mistake with cos theta, why is the primary current over root 3?

I don't know why I was so set on it being negative. I think I must have mixed it up with the angle between current and voltage maybe. Thanks for your help

I thought a lagging power factor leads to a negative phase angle, and thus a negative imaginary component. Is that not right?

So I've seen other threads on here with the same problem from a few years ago, and I'm just not getting the same answers. However, I followed along with a similar problem in the textbook and used all the same methods, so can't understand where I've gone wrong, or if I even am wrong. Also not...

So I've now tried using the same equation for the primary side, and got the primary impedance to be 0.0172. I've then taken the 10 milliohm off from that so 0.0072, and divided this by n squared to give a secondary winding resistance of 5.06 ohms. I still don't have enough confidence in this...

So I've done part a) Primary current = 200000/415=481.9 Cos θ = -0.8 Sin θ = 0.6 Reg=(481.9 ( 0.014*-0.8 + 0.057*0.6))/415 = 0.0267 Reg% = 2.67% Part b I simply used the same equation but for secondary: @ unity p.f., cos θ =1, sin θ = 0 secondary current = 200000/11000 = 18.18...