[rescue] adding power redundancy to single power supply systems ?
pat at computer-refuge.org
Mon Mar 24 21:45:16 CDT 2008
On Mon, Mar 24, 2008 at 08:35:24PM -0400, Steve Sandau wrote:
> >>Since it's APC I assume there is something in there that covers it
> >>during the switch. I don't know what happens if you have power
> >>coming in at different phases... I assume it sends the glitch thru.
> >Dunno about phases (talking above my pay grade ;^), but it seems to
> >me that ideally the APC-type unit would essentially be a relay
> >feeding into a tiny UPS (a big capacitor?) to provide adequate power
> >for the split-second the relay is switching over.
> My old boss was telling me about the switch to bring his generator on-
> and offline. He called it something like a "make-before-break" switch. I
> guess the idea was that the new connection was made before the original
> connection was broken, ensuring a constant supply of electricity to the
> load. I'm not sure how that would work since it would connect the two
> power sources, but that is what he described.
That's different because it's a generator, where you can actually sync
it up to the power input. Trying to do something like that on two
separate utility lines (or anything that's not designed for it) it a Bad
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