nanog mailing list archives
RE: Wacky Weekend: NERC to relax power grid frequency strictures
From: Ingo Flaschberger <if () xip at>
Date: Sun, 26 Jun 2011 23:43:57 +0200 (CEST)
2) Allowing transformer fields to collapse. Even in phase, without a delayed transition ATS you can end up with a partially collapsed transformer field with a new field being created at non-ground state. This can cause a transient back wave that can snap circuit breakers. Yep, this one happened to us a few times before we switched to a delayed ATS, was a PITA to debug and resolve.
a transformer should be switched to the network when phase is at highest/lowest point, not at zero. zero: highist current highest/lowest point: lowest current because it's a coil. Kind regards, Ingo Flaschberger
Current thread:
- Re: Wacky Weekend: NERC to relax power grid frequency strictures, (continued)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Paul Graydon (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Andrew D Kirch (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Joel Jaeggli (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Ingo Flaschberger (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures [OT] Jussi Peltola (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures [OT] Pete Carah (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Owen DeLong (Jun 27)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Michael DeMan (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Seth Mattinen (Jun 25)
- RE: Wacky Weekend: NERC to relax power grid frequency strictures Matthew Huff (Jun 26)
- RE: Wacky Weekend: NERC to relax power grid frequency strictures Ingo Flaschberger (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Pete Carah (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Jussi Peltola (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Jay Ashworth (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Leo Bicknell (Jun 26)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Jussi Peltola (Jun 26)
- RE: Wacky Weekend: NERC to relax power grid frequency strictures Alex Rubenstein (Jun 26)
- RE: Wacky Weekend: NERC to relax power grid frequency strictures Alex Rubenstein (Jun 26)
- RE: Wacky Weekend: NERC to relax power grid frequency strictures Alex Rubenstein (Jun 25)
- Re: Wacky Weekend: NERC to relax power grid frequency strictures Jeff Wheeler (Jun 25)