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From: N_Cook on 2 Jun 2010 09:44
I cannot see what the economic argument is in wasting copper , weight and
space. Both methods require a break in winding the primary. The 2 separate
coil system requiring a break and a pair of tails coming off. The continuous
system probably requires a break in gauge of wire and only one tail but 3
dissimilar wires joint at that point - surely not a cheaper option.


From: Phil Allison on 2 Jun 2010 10:27

"PeterD"

> If it is truely a USA only transformer, it will not have a winding
> higher than 120 volts! USA makers were not export oriented, and the
> few export units were typically fitted with different transformers,
> but the run-of-the-mill domestic production was made with a 120 volt
> primary (only). Export models were typically setup for 100/120/240
> volts. (Japan, USA & and other countries with an approximate 120 volt
> standard, and other countries with an approximate 240 volt standard.)


** Japan does not have domestic 120 volt AC power.

The standard domestic voltage is 100 volts and may be as low as 90 volts in
some places.

The AC frequency varies too, 50Hz and 60 Hz being used in differing parts of
the country - means that most Japanese made products for domestic use
are designed to accept either frequency.


..... Phil



From: hr(bob) hofmann on 2 Jun 2010 15:36
On Jun 1, 4:37 am, "N_Cook" <dive...(a)tcp.co.uk> wrote:
> About year 1999, USA make, for export
> In line , not 2 or more separate primary windings, DC ohms to nearest 0.1
> ohm. I'm assuming same gauge wire throughout
> Labelled by me as A,B,C,D,E crossplot (message souce maybe equispaced font)
>
> --- A    B    C    D     E
> A  ---  9.2  8.5  12.5  1.5
> B  9.2  ---  0.6  3.6   7.6
> C  8.5  0.6  ---  4.2   7.6
> D 12.5  3.6  4.2  ---   11.1
> E  1.5  7.6  7.6  11.1   ---
>
> Would D-E / D-A be 220/240Vac or 230/250V ac?
> what would likely be the 110 or 130V interconnctions option ?
> Other than checking using a variac , any other tips ?

Do you know the approximate secondary voltage? If yes. apply that
voltage to the secondary using a variac or some other transformer.
Then measure the various primary voltages. I have done that many
times when all else fails and I didn't want to take a chance on frying
the transformer. Should work just as well east of the big pond as on
the west side.
From: Cydrome Leader on 2 Jun 2010 16:54
N_Cook <diverse(a)tcp.co.uk> wrote:
> About year 1999, USA make, for export
> In line , not 2 or more separate primary windings, DC ohms to nearest 0.1
> ohm. I'm assuming same gauge wire throughout
> Labelled by me as A,B,C,D,E crossplot (message souce maybe equispaced font)
>
> --- A B C D E
> A --- 9.2 8.5 12.5 1.5
> B 9.2 --- 0.6 3.6 7.6
> C 8.5 0.6 --- 4.2 7.6
> D 12.5 3.6 4.2 --- 11.1
> E 1.5 7.6 7.6 11.1 ---
>
>
> Would D-E / D-A be 220/240Vac or 230/250V ac?
> what would likely be the 110 or 130V interconnctions option ?
> Other than checking using a variac , any other tips ?

you never mentioned what you're even talking about, or what it's from.

Assuming it's something like an "international" linear power supply, there would be
windings for 100, 120 220 and 240 volts based off a combination of terminals. US made
transformers for domestic only use would generally max out at 3 or 4 terminals for
120/240 use.

here's a diagram of how these international transformers work:

http://www.slpower.com/Upload/Technical/20070404102642455201154_41-32512F_ML_Series.pdf
From: PeterD on 2 Jun 2010 19:19
On Thu, 3 Jun 2010 00:27:06 +1000, "Phil Allison" <phil_a(a)tpg.com.au>
wrote:

>
>"PeterD"
>
>> If it is truely a USA only transformer, it will not have a winding
>> higher than 120 volts! USA makers were not export oriented, and the
>> few export units were typically fitted with different transformers,
>> but the run-of-the-mill domestic production was made with a 120 volt
>> primary (only). Export models were typically setup for 100/120/240
>> volts. (Japan, USA & and other countries with an approximate 120 volt
>> standard, and other countries with an approximate 240 volt standard.)
>
>
>** Japan does not have domestic 120 volt AC power.
>
>The standard domestic voltage is 100 volts and may be as low as 90 volts in
>some places.
>
>The AC frequency varies too, 50Hz and 60 Hz being used in differing parts of
>the country - means that most Japanese made products for domestic use
>are designed to accept either frequency.
>
>
>.... Phil
>
>

Geeze Phil, read... Japan is 100, USA and other countries with
approximately 120 volts, and still other countries with 240 volts.
Completely clear to everyone else...

OK, for you:

>>(Japan at 100 volts, USA & and other countries with an approximate 120 volt
>> standard, and other countries with an approximate 240 volt standard.)
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