Do you know the PAC World Magazine? You should!

The PAC World Magazine - "Protection, Automation & Control World" - is a great global forum for the corresponding community:

https://www.pacw.org/

There you will find great discussions and use-cases on IEC 61850 ... and hints you don't find in the standards! 

Another source of background information is buried in the IEC 61850 Tissue Database:

https://iec61850.tissue-db.com/default.mspx

Enjoy!