Re: power and tiebreakers
- From: "Paul Hovnanian P.E." <paul@xxxxxxxxxxxxx>
- Date: Fri, 09 May 2008 20:00:40 -0700
mpm wrote:
[snip]
Ch-4 (TV) in Miami went off the air for about an hour once because
someone had the bright idea to tie the UPS in separate from the
generator.
Utility power goes out, runs on UPS. (20 minutes run time reserve)
Generator won't start. UPS dies.
Generator finally started (after some effort), BUT the UPS would not
release the tie until it recharged.
Long story short: Main, UPS and Generator - and there the station was
sitting in the dark.
Unbelievable.
Not really. I was involved in the repairs to a (supposedly) redundant
power system in a companies critical data center. Someone had installed
some bolts in panelboard buses incorrectly and they were in danger of
overheating.
It turned out that these bolts (and the associated panelboards) were
single point failure locations that could take the entire data center
down. Nobody could figure out how to de-energize even one source and
panel at a time to perform the repairs. The whole data center had to be
shut down for several days.
--
Paul Hovnanian mailto:Paul@xxxxxxxxxxxxx
------------------------------------------------------------------
Relax, its only ones and zeros!
.
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