Per Unit and Percent Impedance Base Change (Part 2) for the Electrical PE Exam

Have you ever noticed that the base change formula for per unit impedance and percent impedance looks backward or incorrect compared to the standard per unit base change formula?

In Part 2 of Per Unit and Percent Impedance Base Change we give a real-life example of base changing the percent impedance of a three-phase generator using the ratings of a downstream transformer as the new base values of the system.


This is Part 2. To see the entire article that this video appears in, and to print out the contents of this video, please visit:

Click here to watch Part 1 of this video:

New to the working with the per-unit system and voltage zones, or would you like to work through a complete example for more practice? Check out our article and full length example on the per-unit system for more practice:


Try out the FREE TRIAL of our online review course for the Electrical power PE Exam and try dozens of free practice problems with full-length solutions at:

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