[Amps] running two 3 phase transformer serie/parallel

[pc5m, Carel]

Hi Gerald, 

We have here 400V 3 phase power (voltage between the
phase's) and as a result 230V between a phase and ground. So the lowest
voltage I have "available" is 230Vac... 

gl, Carel. 

On Tue, 25 Oct
2011 18:02:30 -0400 (EDT), TexasRF at aol.com wrote: 

> Carel, what is
your primary voltage there? Do you have three phase primary power? 
> 
>
73, 
> Gerald K5GW 
> 
> In a message dated 10/25/2011 1:11:15 P.M.
Central Daylight Time, pc5m at xs4all.nl writes: 
> 
>> Hi,
>> 
>> I have
two identical 3 phase high voltage transformer (each around 4KVA /
>> 50
kg/ 100 pounds). Issue is they are designed for US 3 phase voltages.
(so
>> 120 / 204V) so can't use them in Europe as is. What I would like
to do is to
>> put the 2 units at the primary side in serie and at the
secondary side in
>> parallel. Primary and secondary in wye config. 
>>

>> Q: Would there be any benefit of connecting the secondary windings
of the
>> two transformers first parallel and than rectify (with only
one rectifier
>> bridge) or the other way around ? For me it is much
easier to first rectify
>> both transformers and than put the rectified
voltage parallel (only one
>> highvoltage interconnect between both the
big/heavy transformer boxes.). 
>> 
>> I have seen some constellations
with two 3 phase transformer to gain some
>> benefit in creating
additional phases in order to reduce the ripple voltage
>> even more.
Don't know if I could utilize such a thing as well ? However, if
>> I
recall they were placed in parallel at the input. 
>> 
>> Thanks for any
idea's . Gl, Carel
>> 
>>
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