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About cbinla

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    Southern California

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  1. Why does my license expire so soon? I just got it in January? Help me remember the rules.
  2. I received my California "pocket" certificate today, but no wall certificate.
  3. Nothing yet. I was wondering the same thing. I hope my regular mailman works that day and I don't have a substitute. The substitute's sometimes put the mail through the door slot instead of the mailbox I put up recently. My dog hates the mailman and attacks the mail that comes through the slot. I had to cancel my Newsweek subscription.
  4. I would recommend this book: http://www.amazon.com/Power-Systems-Analys...MHZDB745A0K398H I don't think I would have passed the PE without it.
  5. I passed. Thanks to this board for the encouragement and good vibes - oh - and having somewhere to go when I was stuck on a problem - priceless! Thanks to all!
  6. cbinla

    CA - Finally!

    Oops - I should have posted in the official folder. My bad. Yahoooooooooo!
  7. cbinla

    CA - Finally!

    Today I found out that I passed the Power PE exam in California. Yahooooooooooo!
  8. I learned so much while reviewing for this exam (Power). Walking out of that exam, I felt more knowledgeable than i have in a long time regarding my work and my skills. But it will sure be nice to pass. Waiting in CA....
  9. cbinla

    Take home exam

    I am in California. Is there anyone in California who knows whether or not you passed the take home exam?
  10. cbinla

    Take home exam

    I completed the take home exam and returned it with my PE exam application. My exam application was accepted and I took the exam this past October. How do you know if you passed the take home exam? Do they send a pass/fail notice? I never received anything regarding the take home exam. Thanks
  11. cbinla

    Casio fx-115ES

    Shift then Setup (next to the power button) then "2" (Line IO). To switch it back to the fancy display, do the same except hit "1" (MthIO)
  12. Thanks, I was making it more difficult that it is. The base impedance and the base VA define the other bases for each part of the circuit. The voltages can certainly be different for each portion.
  13. I am panicking a little bit since I thought I had this down and now I'm confused on some basic concepts. On the link shown in the example attached, a generator feeds a motor and then there is a fault at the motor terminals. The solution shows the impedance of the motor, 0.2 pu, being converted to base of 50MVA and 20kV. I understand when converting a per unit impedance to a base with a different base MVA and base V the following formula is used per unit Z new = per unit Z given X (base Vgiven / base Vnew)^2 X (base VA new)/(base VA given). If that is the case, why don't they show the motor synchronous reactance as follows: Xm" = 0.2 (18kV/20kv)^2 X (50 MVA /25 MVA) = 0.324 per unit I understand the rest of the problem, which is just solving a simple circuit using the impedance diagram. I am just stuck on the motor's reactance calculation to the new base of 50MVA and 20kV. I'm assuming the motor's per unit reactance is determined from the motor's base values of 25MVA and 18kV. Thanks so much for any help. calc_of_fault_current_example.pdf
  14. I take it that the information they give on the generator regarding the .85 lagging power factor is not important. And this is because this is the power factor of the system without a short circuit, correct? They give the transient reactance of the generator and the impedance of the transformer. Therefore it is necessary to assume the impedance of the transformer is all reactance, correct? Therefore the angle of the impedances of both the generator and the transformer is the same and is <90 degrees, and therefore you can solve it with just using the p.u. magnitudes without considering the phase angles of the impedances. You have to make this assumption because they don't give you the impedances phase angles. Is this correct? Thanks
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