Random Thought Thread

Random thought:

Once, when I was in grade school, I had a class with this really sweet dumb blonde girl named Tracy (last name withheld to protect the dumb). In that class someone had told a joke and everybody was laughing. She was smiling and grinning but clearly not getting the joke and the teacher said "do you want me to explain the joke to you so you can laugh too?" Didn't mean it in a mean way. But in retrospect. That was Savage.
 
The little single phase motor looked up at the big three-phase motor and said "how come you have three wires going into you but I only have two wires going into me?"

And the big three phase motor looked down at the little single phase motor and said "don't worry, that's just a phase that's going through you"
 
Nathan the Machinist said:
The little single phase motor looked up at the big three-phase motor and said "how come you have three wires going into you but I only have two wires going into me?"

And the big three phase motor looked down at the little single phase motor and said "don't worry, that's just a phase that's going through you"
Click to expand...
will you explain this so I can laugh too?
 
WValtakis said:
"Shouldn't" be carrying current😂
Click to expand...

This :)

I remember many years ago being in one of my power classes. One of our practical exercises was in a building, that had a creek in it, and a 3 phase power generator. The exercise was to switch on the power generator, adjust it to be in phase with the grid, and then attach it to the grid. We were about half degree off or so, and when we flipped the switch, it literally rocked the building. :) (Switzerland has a 3-phase grid).
 
ferider said:
All good as long as the phases are in sync and Voltages on par.
Click to expand...


Three-phase motor doesn't use a neutral. In fact, with the floating neutral you can have two legs that are 120 to ground and a third leg that is 208 to ground, and they will be 240 leg to leg if you're on Delta 3 phase
 
Nathan the Machinist said:
Three-phase motor doesn't use a neutral. In fact, with the floating neutral you can have two legs that are 120 to ground and a third leg that is 208 to ground, and they will be 240 leg to leg if you're on Delta 3 phase
Click to expand...

Different perspective here, Nathan; coming from a world with 3 phase grid and 380 V leg to leg and a fourth ground wire. Which seconds as ground if you want to use a single 220 V phase.

Let's say - hypothetically - you have a grid like this and a heavy synchronous 3 phase motor running. Then you switch it off. And seconds later while it is still running, you switch it back on. There will be current on the ground wire.

The few hairs I've left are blonde though, so who knows :)
 
Last edited:
You must log in or register to reply here.
Back
Top