Recent content by MattSiemens

Hi, I have attempted the above question (before looking for help on here) and have the same answer as topcat123 for the first part, so assume I have calculated correctly. I am to struggling on the second part of limiting the fault current through T1 to 5 x FL current. I think I have found a way...

Opps.. 1/s - 1/(s+(1/rc)) Thanks a lot! This was so frustrating as I new the answer was of a first order differential just couldn't get to it!

1/s - 1/s+1/rc

ok thanks, Am I on the right track with ip(s)/s(sc + /r) = A/s + Bs+C/(sc + 1/r)

I'm struggling to see how u have calculated 'Ip(s)*R* [ (1/s) - 1/(s+1/CR) ]' from the step prior to this? I have tried all sorts multiplying out the denominator, rearranging the formula..

Think I've answered my own question is this just the formula for 2 capacitors in parallel; C1 + C2?

How have you accounted for the 2 parallel capacitors in this equation?

Reading these threads I am still lost at how the natural frequency fits in with the sketch of the waveforms. I understand the shapes of the curves from damping ratio but struggling with the significance of the frequency. Looking through my notes I can see the natural frequency has a great...

I'm so confused with this question different answers and calcs everywhere! As the question asks for Rms, I found the square root of the I^2 values (which I assume are peak?), multiplied this by sqrt 2 to get RMS then plugged the values in?? 1/5.635 Sqrt (4.1822^2 + 3.5364^2) then multiplied...

Thanks both gneil and BvU :-)

Am I right in saying then gneill that there is no symmetry and that applying the rules for odd and even functions this proves that? As I mentioned I think what threw me is at + and - 90 degrees the rule for an odd function could be true but applying this at 45 degrees neither odd or even rule...

yes thank you! I think the function is neither odd nor even, applying f(-x) = f(x) and f(-x) = -f(x) In which both cases are untrue, I used 45 degrees as the value of x. Is this correct? I originally used 90 degrees as the X value in which I think wasn't a great value to use as the rule for an...

Can I ask, for this question is a full Fourier series expected to be given? As the question says explain how u would obtain the F.S I expected just to explain what tests I would do on the waveform to check for coefficients and odd or even harmonic content etc. Thanks

Am I correct in saying that Y2 is fairly easy to find? If using the ABCD parameters given and using the parameters for a cascaded ZYZ matrix then Y2 is equal to parameter C in this case? From there I would rearrange from the ZYZ parameters, 1 + Z1Y2, to get Z1. Is this a correct method to...

Can I ask how are you getting to this answer mathematically?? There is a point in the equation where j29.5/_36.87 needs to be changed to rectangular form. This would be J29.5cos(36.87)=j23.6 and J29.5sin(36.87)=JJ17.7 It's at this point JJ17.7 is equal to minus 17.7 and it throws the answer...