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# wiliki

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31

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Intern

## Previous Fields

• Engineering Field
EE
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Electrical

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## Recent Profile Visitors

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1. ## Free giveaway! - Hard Copies of the Electrical Engineering PE Practice Exam and Technical Study Guide!

Wow this is awesome! I’d like a free copy please!
2. ## delete topic

I feel your pain.... but I’m not sure if you should speak for everyone’s income, in light of our current worldly events.
3. ## COVID-19

You’re not being irrational, I’ve thought the same thing as well. I’ve even considered contacting NCEES to inquire on this situation...
4. ## Cram for the PE Sample Test 1 - Problem #13

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.
5. ## Cram for the PE Sample Test 1 - Problem #13

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?
6. ## Cram for the PE Sample Test 1 - Problem #13

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?
7. ## Cram for the PE Sample Test 1 - Problem #13

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?
8. ## Cram for the PE Sample Test 1 - Problem #13

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.
9. ## Cram for the PE Sample Test 1 - Problem #13

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?
10. ## Cram for the PE Sample Test 1 - Problem #13

Perfect, I’ll def print this out also for my references. Thanks so much again!! Sent from my iPhone using Tapatalk
11. ## Cram for the PE Sample Test 1 - Problem #13

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?
12. ## Cram for the PE Sample Test 1 - Problem #13

Please forgive my ignorance... but which one these is the delta-wye connection? The H represents the high side, and L represents low side?
13. ## Cram for the PE Sample Test 1 - Problem #13

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?
14. ## Cram for the PE Sample Test 1 - Problem #13

thanks again @Chattaneer PE ; this all makes sense now, appreciate you getting back to us so quickly 😊
15. ## Cram for the PE Sample Test 1 - Problem #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).
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