Three-Line Diagram?

[Passacaglia]

Hi all, is anyone familiar with the term 'three-line diagram'? I've been searching and googling up the wazoo, but all I've uncovered so far is that "A three-line diagram is more detailed than a one-line diagram," which is frustratingly vague. I'm guessing that this term is an alternate one for a more commonly-used term.

(I'm a three-year EE student working an informal internship at a small hydroelectric facility. My 'bosses' have asked me to look into reconnecting to the NYS grid via the NYSEG power company, but neither of them are engineers so I'm mostly on my own. A three-line diagram is one of the first steps that NYSEG documentation requires to connect to the grid. I've been trying to reach NYSEG, but I figured I'd ask the good EE folks instead of sitting on my hands.)

[Kelly_Bramble]

Three line Diagram?

three line diagram.png

[Passacaglia]

Thanks, Kelly!

[jackieann000]

Nice information. Thanks