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Does anyone know why we need to multiply the current by 1.15 and round down to get the final answer? I do not understand the rounding down since the question asks for the maximum sized protection device that can be applied

Hi all, One more question. In the solution they used 7.62 ang (0 deg) and 7.62 ang (+120 deg) Shouldn't it have been 7.62 ang (0 deg) and 7.62 ang ( -120 deg) I.e. shouldn't the angle be negative in phase b versus the positive value used?

Thanks, appreciate it.

Does anyone know how to use the MVA method for this problem? I tried the link above and it no longer works, and I have also been searching the forum. Thanks

Hi all, Would there ever be a situation where we do not divide the voltages (138 kV, and 57.7 kV) by sqrt(3). I.e. is there ever a time that this would be a delta connection? Otherwise, do we always assume a wye connection for an autotransformer, and thus we should always divide the voltages...

Hi all, Does anyone know how to draw this?

Hi, thanks for this. Also, would 34.9 deg be negative?

On question 63 do we ignore the reactive power since the real power has even symmetry with the power factor? Two Generators Have The Following Characteristics: thus wouldn't the total power be the following Pt= Real( 293 kVA ang (-cos^-1(.82)) + 1,131 kVA ang (cos^-1 (.9)) )

Does anyone know why the copper losses over a 24 hr period are 12 x 5 instead of 24 x5? NCEES #48, A company is planning to purchase a transformer to supply a load operating on a daily load cycle of 12 hours at full-load and 12 hours at no-load while remaining connected to the supply. The...

Hi Aykip, would it be possible to repost your image broken up into two images? If you can do this it would be a big help!

Actually spent more time reviewing this figure. I understand it now. Thanks so much for making this!

Hello, I am trying to analyze the above figure from Cram for the PE, which was very helpful, but I am trying to apply formulas provided from the first post, Vag = Vab - Vbg (etc) If I were to apply the formula to the above problem I am struggling to see how to plug in the numbers to match...

Is there a right answer as to what size the fuses should be to protect the conductors against short circuits or ground faults. The answers provided are just the incorrect responses, and so wondering if there is a right answer?

Thank you Aykip. Also, I downloaded the image and can interpolate your message above to the download. The forum, I believe does not give me the ability to download a higher resolution image that I can zoom in and look at. If you are able to re-upload as two images I would appreciate it, but...

Thanks much Zach. I am still a little confused though. Is the little a and big A on the right side ( mean shouldn't the big A be on the left of the load, and the little a be on the right-hand side of the load)? I'm also confused on the right-hand side of the circuit because the problem shows...

Hello everyone, does anyone have any links that demonstrate visualization or drawing representations for this problem? I think I understand the solutions, but I don't completely feel like I truly understand all the variations and intricacies of the question. When using the method of...

Also, is Zach is there any type of visualization for the single-phase equivalent circuit?

Hi everyone, this is probably a dumb question, but when reading the question how is someone supposed to know that there is no load on phase C, and neutral? My concern is that I would not identify that the problem didn't state that a load didn't exist on phase C, and that I would struggle to...

Hi everyone, does anyone know what the drawing would like for this problem? I am not certain I understand if I completely understand how the surge look. An industrial plant is served by a 12,470-V M480-V grounded-wye transformer. The high voltage side of the transformer is served from a...

Hi everyone, does anyone know what the drawing would like for this problem? I am not certain I understand what the problem means when they mention auxiliary CTs or how these would be connected to the differential relay. A differential relay circuit connected to protect a delta-wye...