Recent content by Zach Stone P.E.

This is a three phase wye-connected capacitor. If you want to find the capacitance (C) in each phase of the wye connection (so that you can change the frequency from 60 Hz to 50 Hz and see the resulting outcome), you'll need to use the voltage across each phase along with the reactive power...

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Glad you enjoyed it. There are plenty more like it on our YouTube Channel if you'd like to learn more about transmission lines or other power PE exam subjects.

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Is this true? I why would senior members get booted with new ownership. Honestly I think this is what killed the traffic. I don't blame the old owners for selling, he was a great guy and probably spent quite a bit out of pocket to keep the vbulletin forum platform running. The crazy amount of...

When using Ohm's law to solve for the line current drawn by a three-phase system, you need to use line-to-neutral voltage of the system, regardless if the source or load are delta or wye connected. If you have a delta connected load, you can solve for the phase current in each phase of the...

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In case you missed it, here is the recording of yesterday's free live class for our new AIT only practice exam book launch. Last night I solved three AIT Practice Problems from our brand new book Electrical Power PE Practice Exam: 80 AIT Practice Problems for the CBT Format. You can watch the...

Congrats again! Thanks for being a student in our online class for the new CBT format of the Power PE Exam at www.electricalpereview.com. Now enjoy the celebration!

Hi Rafis, There is a lot of great information on these boards already for the two-wattmeter method. If you use the search bar you'll be able to dig up plenty of prior threads that can help you with this. In the meantime, here are my three favorite videos that I made to help engineers with the...

Thanks for the mention @DLD PE !

At the very least be very familiar with the ANSI numbers included in the Reference Handbook, but a general understanding of relay principles, applications, and theory is reccommended.

Yep! Turns ratio is a = N1/N2. For a step up autotransformer, N1 = Nc and N2 = Nse + Nc. For a step down autotransformer, N1 = Nse + Nc and N2 = Nc. See the video above at 21:30 for an explanation of both.

Determining the rated power of an auto-transformer It's just about as straightforward as determining the rated power of a regular transformer. The same formula applies: |Sin| = |Sout| |V1|·|I1| = |V2|·|I2| It's just the product of the primary voltage and current or the product of the...

Hi @Mr-T_Swift, Here is a quick article you'll like to help you remember the difference between the power angle and the current angle (and how not to mix them up): Leading and Lagging Cheat Sheet! Printable Reference