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About Panchito

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  1. I passed the Electrical and Electronics PE exam few years ago. For all the transmission line topics (Smith chart, impedance matching, reflection coefficient, SWR, etc, etc) I strongly recommend watching the ECE3300 videos, lectures 12 and 13, posted in Youtube. You will become an expert in those topics after watching the videos. I also added a couple of problems from those videos into my PE reference material. It was extremely helpful during the exam. That helped me with 2 or 3 problems during the exam.
  2. I agree the term engineer is loosely used in some companies. I have seen job titles such as "quote engineer", "proposal engineer", "bid engineer", "customer engineer", etc
  3. This case was highlighted in the last edition of the IEEE publication The Institute:
  4. Washington state? If so, your wall certificate will have the name you provided in the PE Online Application form (
  5. When I took the PE exam (2014, WA state) I was a green card holder. A couple of coworkers with work visas (H1) took the PE last October.
  6. Panchito

    PE Certificate

    Yes, there are quite a few, just google Laser Engraved Diplomas or Laser Engraved Certificates.
  7. Panchito

    PE Certificate

    The price information is in the web page. Prices may vary depending on the style you choose. For the one shown in the picture (floating acrylic) I paid about $160. A co-worker got the engraved wood style and paid about $80 for it.
  8. Panchito

    PE Certificate

    I used the services of this company to do the laser-engraving: The specific design I used (the one shown in the picture) is called Floating Acrylic Diploma Plaques, but they have other cool-looking designs that you can find on their web page. you just need to scan your diploma in high resolution and e-mail it to them.
  9. Panchito

    PE Certificate

    I laser-engraved my certificate. Looks great. BTW, I took the exam in Oct 2014 and received my certificate in March 2015 (WA state).
  10. In WA state you need to wait about 2 weeks after the results are released to be able to lookup your name and get your license number.
  11. Panchito

    WA State?!

    Congratulations @thejulie@GoCougs2002 and to all the new PE's in the Evergreen state !!!! Greetings from the Palouse.
  12. Panchito

    WA Results

    After the results are released, the WA department of licensing takes about 2 weeks to update the web page with the new licenses. I took the exam in October 2014 and received the results email notification from NCEES on December 15th at 1:14pm (first day). My license was updated in on January 1st at 3:30am (yes, during new year celebration), and received my wall certificate some time in March.
  13. The problem states that it is an ELECTROMECHANICAL differential relay. As you know, delta-wye transformers have a 30 deg phase shift between primary and secondary. When doing differential protection, we need to compensate for this phase shift (otherwise, currents going into the differential relay will be out of phase). So, the 3 CTs at the delta side of the transformer have to be connected in wye, and the 3 CTs at the wye side of the transformer have to be connected in delta. This will ensure that the currents going into the differential relay are in phase. Therefore, the CTs at the primary side of the transformer are connected in wye, and the CTs at the secondary side of the transformer are connected in delta. Since the CTs at the secondary side of the transformer are connected in delta, you need to multiply the CT output current by the SQRT(3) factor in order to get the line current. This method to compensate the 30 deg phase shift is only used with electromechanical relays. With microprocessor relays we use a compensation matrix in the relay to correct for the phase shift.
  14. Since the problem does not give you any 0 degree reference angle, you can pick any quantity as your 0 degree reference, for example, Van. Then, your voltages would be: Van = 7.62 @ 0 deg Vbn = 7.62 @ -120 deg or you could have picked Vbn as our reference angle. In that case, you would have the following: Van = 7.62 @ 120 deg Vbn = 7.62 @ 0 deg Both options above will give you the same result, because the problem is asking only for the MAGNITUDE of the neutral current. The ANGLE of the neutral current will be different, because it will be relative to the quantity you picked as your 0 deg reference. But that does not matter because the problem is not asking to find the angle. If the problem had asked for the magnitude and ANGLE of the neutral current, then they would have to give a reference 0 deg angle. For example, Vab. In that case, you would need to take into account the 30deg phase shift when doing the LL to LN conversion. And regarding your second question, you use complex conjugate because the complex power (S) is the product of the voltage and the complex conjugate of the current. S = V.I* Hope this helps.
  15. 1/s is the impedance of the 1F capacitor. So, you are doing a bode plot using the impedance of the capacitor as a transfer function. That makes sense only if the output of your system is a voltage, and the input is a current (because voltage over current is impedance). In that case your plot makes sense because when you reduce the frequency, the current through the capacitor goes down (impedance of capacitor goes up when frequency goes down), therefore, the ratio between voltage and current goes up. If the frequency goes all the way to zero (DC), then the voltage/current ratio will be infinite, because no current (steady state) will flow across the capacitor.
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