19 Oct
2007
19 Oct
'07
5:04 p.m.
William Donzelli wrote:
Except that after going through a 3-phase bridge rectifier, you have
360Hz (with a good DC component) vs 120Hz that drops to 0v so you need a
lot less filter caps with the 3-phase. And frankly the situation I'm
dealing with draws ~500A @12V - that's a butt load of current over
single phase (and that's just the stuff that *requires*
3-phase...there's a bunch more power that splits the phases to get
standard 120v single phase). Total load requirements are 70A across all
3-phases (210A single phase...how the *hell* are you going to wire that?).
--
TTFN - Guy
Unless it has
a Ferroresonant transformer...then you *need* 3-phase.
Some three phase transformers can be run off one phase - it depends
how they are wound. Some of the guys that run old tube broadcast
transmitters have done this, and there is a good article on it in an
old issue (ten years ago?) of Electric Radio magazine.