Recent content by Hndstudent

Hi Gneill, I am still struggling to work out ##I_n##. And am I close with my I1 rms and n max answers? Thanks

Hi Gneill, please find attached original worksheet. and a screen shot of the completed waveform.

The supply current was sampled 1024 times over a very short time interval. The data so obtained is given in column B of the accompanying Excel worksheet1. This worksheet has been set up to give a graph showing the spectral components of the data. Question 3 i) Obtain the Fourier Transform for...

Hi Gneill. please can you take a look at my sketch and let me know if i am anywhere near? Thanks

so it was, many books back. thanks for your help

Hi gneill, for part d) i calculated my phase current to be 9.2222-j9.2222 A so P= 3 x 415 x Iph = 11478.9 - j11478.9 Watts im not confident that this is correct though? thanks

Im obviously going wrong somewhere when calculating the brackets. Im ending up with v20= (67.071+j30)/(0.75+j0.05) is it my numerator or denominator that is incorrect? or both!? thanks

Hi gneill, when you say there is a sign issue with the 3rd term, are you saying that (-(v20+v3)/z5) is incorrect? this is what i have so far, and I have tried changing the signs but I keeping on getting a wrong answer. -v20(1/z1 + 1/z4 + 1/z5 + 1/z3) + ( v1/z1 + v3/z5 + v2/z3 +v3/z3)=0 does...

hi gneill, i started off with ((v1-v20)/z1) + (-v20/z4) + ((-20-v3)/z5) + (v2-(v20-v3)/z3)=0 thanks

That answer was obviously very wrong. however, this is where I am at but i am still getting an incorrect answer. can you advise me on where I am going wrong please -v20(0.75+j0.05)+(67.071+j30)=0 (67.071+j30)=v20(0.75+j0.05) divide both sides by (o.75+j0.05); [(67.071+j30)/(0.75+j0.05)]=v20...

Cheers gneil. The university confirmed what you said about the spread sheet and it eventually worked :) however, for my next problem on 2b, I have factorised and multiplied by conjugates to end up with the following; v20(-0.1667-j0.028)+(17.896+j7.670)=0 Im just not sure how to get v20 on its...

Ok thanks gneil. Whilst i have been waiting for the university to reply regarding the matrix, I was working through my equations for each loop again and for loop1 I have; v1-z1I1-z4(I1-I2)=0 if z1=2 , z4=-j5 and v1=120 then 120=(2+j5)I1-j5I2 (is this not correct?) as before I had...

I gneill, the spreadsheet is off the Universities Blackboard. Would you recommend that I contact them and inform them that there is a problem with it? Or is there something that i can do to fix it? Thanks

Hi gneill, I am having a little trouble with the matrix spread sheet when entering my values. I have read through this forum and notice that my answers are the same as that in post #31 and #33 which you say are correct. But when i put these figures into the matrix spread sheet it is incorrect. I...

annoyingly when calculating my brackets I wrote the answer down wrong! But thanks for making me go back and recalculating. (Y)