How much power can an open delta transformer deliver? How much power can an open delta deliver compared to a standard three phase delta transformer? Where does the power formula for the open delta transformer connection come from? What are the phasor diagrams for an open delta transformer? What about the current and voltages for […]
2018 Changes to the NCEES® Exam Specifications
As of November 2017, NCEES® has officially updated the Electrical Power PE Exam Specifications starting 2018 for all future exams. They also released a new edition of the NCEES® official practice exam for the Electrical Power PE Exam. At first, there appears to be a lot of changes but the good news is that the PE […]
Base Impedance – Do We Use Single Phase or Three Phase Values to Calculate?
Related Article: Try our fully worked out Per Unit Example with the following free article: Electrical PE Review – Per Unit Example: Tips, Tricks, and What to Watch Out for Imagine you come across a three phase system with per unit impedances and you need to calculate the actual value in ohms: […]
Leading and Lagging Cheat Sheet! Printable Reference
The following two rules will fix 99% of any mistakes you might be tempted to make with leading vs lagging power factor for the PE exam. What’s in this article? – Leading and Lagging Cheat Sheet: Click below to jump to any section. Power Angle Rule #1 Power Angle Rule #2 Lagging Power Factor Diagrams Leading Power Factor […]
Avoid These Three Phase Power Formula Mistakes!
I want to share with you the the most common mistakes that students make with three phase power formulas that lead them to getting robbed of correct answers on the PE exam, and remind you why specific notation is so important. My goal of this article is to get you out of the bad habit […]
Confusing Impedances – What’s the difference?
The many “-tance” terms of Electrical Engineering There are many different types of impedance components and they all rhyme, making it hard to remember which one is which. Many even have the same units, which can lead to even further confusion. Don’t let the same “-tance” ending fool you. If you run into a question on the […]