Purchasing European Voltage Transformer Questions

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Retain a consulting firm that specializes in data center power systems
they have resources that you do not: suppliers, previous projects, etc
the conceptual design is critical
if on the wrong track as determine by the ee firm it may all have to be restarted
that is time and money
going down the wrong path here is costly
if the method was common the xfmrs would be

but there are std xfmrs that will do it
eg a 14400 to 480 dy
prim taps +/- 2 x 2.5%
sec +/- 4 x 1.67%

I've worked in some large ones ( 5 mva is on the small side)
iron mountain, mellon, progressive, etc
some have 20 mva in generation alone...for one subsection

the suggestion to go 480/277 bears consideration
all standard equipment
 
wehaveplans said:
One of the USA transformer manufactures suggested that we tap the primary voltage up to 14.49kv so that we result in 440/252 on the secondary. Is there anything wrong with doing this?
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Not really, especially if that connection is shown on the nameplate.
It sounds like you are designing your system based on what you can get within a relatively short time frame.
 
wehaveplans said:
One of the USA transformer manufactures suggested that we tap the primary voltage up to 14.49kv so that we result in 440/252 on the secondary. Is there anything wrong with doing this?


The server power supplies are rated at 200 to 240v. Looking further into their design, their AC/DC converter is rated 176v to 264v so 252v will work. I assume the 200v to 240v is just an engineers way to mark them for a 208v environment. Furthermore, they have three under/over voltage/current devices in them. We have tried to run these on 120v before and they will not even turn on. I've seen these be over powered and they simply kick off.
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Post #1 operating voltage 200-250v
Post #19 listed operating voltage 200-240v
A nominal voltage of 252v, 12v over the nameplate.
But you assume it's safe, as you seen a test.

Even a 5% surge would put the 240v equipment to 264.6v, shutdown.
What connection would they have, 250v cord caps?
Seems like the 176 and 264 is a margin of safety and operation extremes of 10-12%.
 
active1 said:
margin of safety and operation extremes
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Dead on. He claims to be an engineer, but not an EE. Any engineering discipline should be extremely familiar with what you just addressed.
I am wondering if he's just moved from Europe. Technicians are called "service engineers" or shortened to engineers
 
Electric-Light said:
Dead on. He claims to be an engineer, but not an EE. Any engineering discipline should be extremely familiar with what you just addressed.
I am wondering if he's just moved from Europe. Technicians are called "service engineers" or shortened to engineers
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Yes. A much misused term.
 
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