Video Table of Contents (click each timestamp to advance): 0:45 1. No bundle - one (1) conductor per-phase: r' = 0.7788r for Solid Conductors GMR_C1 = diameter/2 For named stranded conductors (like Blue Jay ACSR), the GMR has to be looked up in a table or given in the problem. 2:02 2. Two conductor bundle - two conductors per-phase: GMR = √(r'·d) GMR_C = √(r·d) 7:19 3. Three conductor bundle - Three conductors per-phase; GMR = ³√(r'·d²) GMR_C = ³√(r·d²) 12:38 4. Four conductor bundle - four conductors per-phase; GMR = ⁴√(r'·d³·√2) GMR_C = ⁴√(r·d³·√2)
Wowww. I am impressed by the upgrade to the Video of the class Zach. It just makes me feel like signing up for the class again :) But thanks to you and Electrical PE Review team- I passed in last December the CBT version. I wish you and your team the best in helping so many people like me.
I like the upgrades to your video Zach! As I've said before, I was impressed by your work in constantly improving your content and the new format of your videos definitely appears more like a natural classroom setting.
Hi, I'm faced with a problem where i need to calculate the GMR of a 6 conductor bundle, I'm curious to what the coefficient will be, seeing that for the 4 conductor bundle it is 1.09
it depends on the physical layout of the 6 conductor bundle and the distance measured between each conductor. While this is outside the scope of the PE Exam, any transmission line text book will have examples of this if you are looking for more details.
It's a theoretical value that helps to simplify the calculation of inductance since current does not flow uniformly throughout the conductor due to the skin effect (en.wikipedia.org/wiki/Skin_effect).
