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I wanted to hop on this thread and say thanks to everyone as well. I passed, and this board was a huge help. The vast accumulation of sources of information, and great people that went the extra mile to thoroughly explain confusing problems really got me out of some tough spots in my studying...

I thought the afternoon was much easier than the morning.

I agree that all the CI and spin-ups I did had very little to do with the test. But I do not regret any time I spent on those practice tests. I really believe that they made me more familiar with material that I would've otherwise glossed over, and it also helped get my reference materials in...

I took power as well. I felt the test was hard. As some of my colleagues said right afterwards "That was a TEST." Like everyone said, there were more conceptual questions than I expected. I wanted to get a bunch of easy econ questions, but no...I'm very glad I borrowed a Schaum's machines book...

Yes I think this problem is bunk. If the author of the Spin-ups exams could chime in? All sources I find use the dot alignment to either buck or boost the VOLTAGE. And, frankly, this is my experience with messing around with coils on the test bench :]

http://www.jmpangseah.com/wp-content/uploads/2003/01/chapter-5.pdf This is what cleared it up for me (SLG fault with MVA method)

I think I figured out Moon's MVA Method for SLG fault (single phase to ground fault). He has three branches, as if it is a 3PH fault. And then he calculates the current as if it were a 3 phase fault, meaning he uses the formula Isc_SLG = MVAsc / (rad(3) * V_LL). In this case, MVAsc =...

I searched for "branches" in this forum for the exact question you have, Ros. I do not understand this MVA method paper's calculation of SLG fault. Does anyone know why there are three branches?

reading through this, I just wanted to add: by definition, S_sc = S_base / Zpu. When they give us "fault duty" of 40MVA, that means they gave us S_sc, using 40MVA as S_base: S_sc = S_base / Zpu 40MVA = 40MVA / Zpu Zpu should be assumed to be 1pu, as Flyer has said, but it didn't click with...

I too was equally confused by this. I've always referred to bucking as step-down, and boosting as step-up- but as it was said here, they don't seem to have anything to do with each other. My guess was that when the windings were aligned (same dots, Boost) the current capacity is "boosted" and...