Recent content by jnspark

So not a relay problem so much as a transformer problem? I guess what got me was the Vng part.  Thanks.

Can anyone provide an explanation for this problem?  I presume it's something to do with the ratio, but what is Vng?  Is this simply asking for what voltage (line to neutral) is necessary, in KV, on the primary to trip? Gotta say, stuff like this is not making me look forward to Friday.

I agree too.  the equation for capacitance is   Which has radius in the equation.  I think it plays a tiny role in the equation compared to length and voltage, but still proportional.   What are we missing?

Check out the following link Triplen Harmonics as it will give a good overview.  I will not present math or equations as I don't know them, but with 3rd harmonics, a triplen harmonic, you need to also think in terms of symmetrical components and KCL.  The third harmonic is zero sequence current...

I talked to a co-worker, who took the April test, and he explained to me the "j" that is dropped in the NCEES equation makes it purely reactive and therefore the I^2 * R equation becomes the reactive power.  All that confusion for the lack of the "j" in the denominator. Thanks BirdGrave, but...

I am working on problem 531 and I personally do not agree with the NCEES answer.  Help! The question is asking for the Var losses in a transmission line during the transfer. I used the equations I found to calculate the active power transmitted, done to simply verify that the system did in...

Cool, thanks.

I purchased the cheaper international edition of the Wildi book and am extremely frustrated with the horrible index.  I was wondering if anybody on the board and who has the US edition can tell me if the index in that copy is useful?  For example, looking at transformers in the int'l edition...