i cant help you.
i know just enough to be dangerous with electronics, but ive been wiring and doing electrical work since i was a teen. ive also installed tons of voice and data networks (no software, just a hardware guy) ive done everyting from single phase houses to 3 phase industrial/commercial electric, and have never once had the need for a scope, not even a little.
i do have a phase indicator, or phase rotation meter, or whatever you want to call it, to determine which leg of your 3 phase is which, maybe, and this is a big stretch, but just maybe you could argue that a 3 channel min scope could perform this task, but imo, its impractically over complicating it.
now, if you had asked about a scope use in auto repair, thats another story. hundreds of uses there.