A case for downgrading to PCs (was: WARNING: RANTING COMPUTERNUT...

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Thu Jun 17 21:36:10 2004

>From: "der Mouse" <mouse_at_rodents.montreal.qc.ca>
>
>> Most know about motor rotation but he was talking about delta versus
>> Y. This can be quite different.
>
>What _is_ the difference between delta and Y? A while ago we had a
>discussion that ended up revolving around what point is grounded
>("neutral"). As far as I can see, delta and Y are basically
>equivalent, provided you don't try to refer anything to ground (or
>anything else beyond the three phases), and provided you don't overload
>anything.
>
>Am I missing something?

They would be the same if one only connected the points of
the three phase. The problem is one often ties 120V stuff
between on of the legs and the neutral center of the Y.
If one has three balanced 120V, everything is OK. If
not, one will have all the voltage drop and bang!
Dwight
Received on Thu Jun 17 2004 - 21:36:10 BST