[142424] in North American Network Operators' Group
Re: Wacky Weekend: NERC to relax power grid frequency strictures
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Sat Jun 25 18:13:28 2011
Date: Sat, 25 Jun 2011 15:12:08 -0700
From: Leo Bicknell <bicknell@ufp.org>
To: NANOG <nanog@nanog.org>
Mail-Followup-To: NANOG <nanog@nanog.org>
In-Reply-To: <23981692.56.1308954554440.JavaMail.root@benjamin.baylink.com>
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In a message written on Fri, Jun 24, 2011 at 06:29:14PM -0400, Jay Ashworth=
wrote:
> I believe the answer to that question is contained here:
>=20
> http://yarchive.net/car/rv/generator_synchronization.html [1]
I wouldn't use a colo that had to sync their generator to the grid.
That is a bad design.
Critical load should be on a battery or flywheel system. When the
utility is bad (including out) the load should be on the battery or
flywheel for 5-15 seconds before the generators start. The generators
need to sync to each other.
Essential load (think lighting, AC units) get dropped completely for
30-60 seconds until the generators are stable, and then that load gets
hooked back in.
I have never seen a generator that syncs to the utility for live, no
break transfer. I'm sure such a thing exists, but that sounds crazy
dangerous to me. Generators sync to each other, not the utility.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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