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wiliki

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About wiliki

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    Intern

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    EE
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    Working on it!
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    Casio
  • Discipline
    Electrical

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  1. You’re not being irrational, I’ve thought the same thing as well. I’ve even considered contacting NCEES to inquire on this situation...
  2. Thanks guys, that helps a lot 👍 @Chattaneer PE @LyceeFruit PE We're gonna have to purchase more books on protection over here. Heard about Blackburn, but have yet to look into it. Please let me know if you have any other good recommendations for protection references.
  3. Another problem here, problem #21. We're at loss with the solution, as this is the first time we're seeing a relation between generator curves, to R-X diagrams, and to a distance relay. Does anyone understand the solution or is able to provide more clarity?
  4. Question on this one - Why is there a 0.1 ohm resistance in the equipment grounding conductor? Didn’t see it as a given in the problem - the problem specifically states “A single-phase load is connected phase-to-neutral and is feed from the source with each conductor, including the equipment grounding conductor, having a total resistance of 0.1 ohm” It says “total resistance”... so why does the hot have a resistance of 0.1 ohm, and why does the EGC have a resistance of 0.1 ohm?
  5. Hello, we’re working on the same problem set, but from book #2 now. We’ve got a question for problem #19 below. The solution says that there is no neutral in the wye-wye transformer to carry harmonics. However, going back to the question.... we don’t see a mention of a wye with neutral. For problems like these, do we just assume no neutral? Also, if there was a neutral, does this help to mitigate the harmonics?
  6. hello again! I'm here doing some problems on my lunch break and am a bit confused with this one.. So I see in the solutions that the positive, negative, and zero components were first derived. I am a bit confused with the -30° and 30°... I know that since this is a delta-wye transformer, there is a phase angle shift. But how would I go about designating the positive and negative signs for just phase A to the positive and negative components? I was referring the symmetrical components diagram below.
  7. Okay one more question here. The solutions to this says the answer is a) Profile 1 "for the given circumstances." We were a bit lost with this solution. If there is no load, shouldn't the voltage remain the same from send end to receiving end (Profile 2)? Why does voltage increase at the receiving end for Profile 1?
  8. Perfect, I’ll def print this out also for my references. Thanks so much again!! Sent from my iPhone using Tapatalk
  9. My initial understanding was that that (a) is a wye-delta connection? Or can I view these diagrams interchangeably for both the high and low side?
  10. Please forgive my ignorance... but which one these is the delta-wye connection? The H represents the high side, and L represents low side?
  11. hey @Chattaneer PE I've got another problem here from the Cram for PE test. I probably need to refresh myself on symmetrical components fault analysis after this... Why is the j0.07 reactance not included in the zero-sequence portion of the circuit? Also, is it standard to always assume V = 1 pu?
  12. thanks again @Chattaneer PE ; this all makes sense now, appreciate you getting back to us so quickly 😊
  13. Thanks so much for the detailed response on both problems! Do you happen to have any recommendations on books on inductors, frequency, ripples, reactance, etc? You gave a great explanation, but we don’t know what to reference if we ever come across this problem (other than google).
  14. Hey guys, I know this is a simple problem, but can anyone provide their feedback on attaining the answer to this? The solutions manual says it's (D), but we had initially assumed the answer was (C) due to no ground.
  15. Thanks for the mention Chattaneer! Anyone on this forum have any good recommendations of references (books, practice problems, websites, etc.) for study on circuits/electric power devices? I feel like this is my weakest section on the PE exam.
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