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Re: AC/AC power conversion for datacenters
From: Vadim Antonov <avg () kotovnik com>
Date: Tue, 3 Jun 2003 13:52:52 -0700 (PDT)



Here's a 3KW one for E389:

http://www.taunus-transformatoren.de/transformers/transformers_110_120_220_230_240.htmlMatthew Zito <mzito () gridapp 
com>, 

(Actually, you don't need a two-coil transformer - a one-coil transformer
with a tap in the middle will do, and those may be even cheaper).

Note that transformers do NOT change frequency from 50Hz as in EU to 60Hz
as in US; typically this is not a problem for electronics power supplies,
because the first thing they do is rectify the mains voltage to DC, but
you may want to check that with your equipment specs or with their tech
support.

Note also that if your higher-voltage equipment requires multiple phases,
you're out of luck. The "220V" in US is usually two 110V feeds with 180
degrees shift, so there's a zero-point wire as well, allowing asymmetrical
loading.  This kind of supply may be provided with a transformer, but I've
never seen one like that.

The EU multi-phase power is typically 3-phases with 120 degree-shifted
230V supplies, there's no way to convert to it from single- or dual-phase
power to it w/o electronic invertor or motor-generator combination.

--vadim


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