400Y/230 volt transformer?

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Jim1959

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I was reading another thread about a 400Y/230 volt transformer. I have never heard of this system voltage before. Is it common and in what types of installations?
 
Jim1959 said:
I was reading another thread about a 400Y/230 volt transformer. I have never heard of this system voltage before. Is it common and in what types of installations?
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In UK, the distribution transformer is often 11kV delta primary and the secondary ia star 400VLL and 230VLN
I suppose I ought to add nominally in case Tony gets in a strop.
 
ron said:
There has been some traction to using 415/240V 3 phase in data centers, since most computer power supplies are rated to handle 240V.

http://www.missioncriticalmagazine....ome/Files/PDFs/Emerson-Proper_Application.pdf
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Yes, the UPS mfrs are pushing this concept because they want to control more of the power distribution chunk by making UPS systems that take in 480V and put out 415Y240V without the need for an external transformer. Using 240V to feed single phase server power supplies increases the power density of the distribution system (vs 120V).

At the same time however, the people making the power supplies for servers are working at the other end to go from a "universal input" of 115-250V to be 200-400V, which means they work on 480V and 600V Wye systems in North America (as well as 200V systems in Japan and 690V Wye in some industrial areas of Europe) without the need for a voltage change at all. They are all but abandoning 120V inputs now. I just finished working on a PDU project for Google (they manufacture their own blade servers) and that's what they are doing; 200-400V input switch mode power supplies that can be installed anywhere in the world without the added burden of voltage changes.
 
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