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Technology Stocks : The *NEW* Frank Coluccio Technology Forum
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To: axial who wrote (24782)1/4/2008 10:29:44 AM
From: NDBFREE  Read Replies (4) of 46821
 
<your comment about d.c. transmission was interesting. Would you care to say more on the subject? I don't know a lot about it, except that it was once preferred, and (as stated in the article) offered lower transmission losses>

not sure I can agree with the lower transmission loss comment.

Here goes nothing.

Edison favored DC electric distribution while Westinghouse and others favored AC. In old days (as I understand it) problem with DC was the voltage was generated and distributed at one voltage. Don't believe it is possible to build a DC power transformer.

PT's typically step up voltage for transmission and then step it down (right near the point of use) for utilization. As voltage used increases current goes down (KWA = Voltage X amps).

Depending on a lot of things DC is today favored for long distance, high voltage transmission. While their is the cost of a AC to DC converter station at 1 end and a DC to AC converter station at the other end there are on;y 2 wires instead of 3 and stability (a whole different subject) is improved.

Most of the power used by data centers is DC. Currently data centers include a lot of AC to DC conversion equipment because the power supplied is by the local utility is AC. Conversion equipment is expensive and there are significant energy losses associated with the conversion.

Believe for future data centers more thought will be given to building all DC data centers with the power used generated by gensets, etc. powering DC (not AC) electric generators.

Hope above helps.

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