The spec qcroanoke gave 220V as one of the options. A buck boost would give you that. It's less than 6% boost.
On the other hand, if you really need 380V a double would could do that for you.
380v European Equipment
- Thread starter Npstewart
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On the other hand, if you really need 380V a double would could do that for you.
According to the manufacturer, the purchased machine will only run on 380v. The 220v version is actually a sub-model which was not purchased.
Then I think you are faced with getting a 208:380V double wound transformer. I don't know if that's an off-the-shelf item for you but you can get one made to order.
Thanks. Sounds like my only option at this point. I found a website earlier that makes them to order. Ill dig through my history to see if I can find it.
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- Placerville, CA, USA
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- Retired PV System Designer
If you are going custom wound anyway, a 208:162 double wound would give you a boost wiring configuration with a marginally smaller transformer. One side of the machine would be 120 to ground and the other would be about 200 to ground. If it was designed for Euro 380 and therefore does not require one terminal to be near ground that would work.
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qcroanoke
Sometimes I don't know if I'm the boxer or the bag
- Location
- Roanoke, VA.
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- Sorta retired........
Sounds spensive, But you can get anything made if the price is right.
wwhitney
Senior Member
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- Berkeley, CA
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- Retired
Uninformed question/suggestion: would an off-the-shelf 240V:480V step up transformer have taps available to allow one to use it as a 208V:380V transformer?
Cheers, Wayne
Cheers, Wayne
qcroanoke
Sometimes I don't know if I'm the boxer or the bag
- Location
- Roanoke, VA.
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- Sorta retired........
We used to deal in 220/380 shelters a lot and I don't think I ever seen anything that was 380 single phase, it was all three phase.
Is single phase normally available in most areas?
Are homes 380 or 220 vac?
petersonra
Senior Member
- Location
- Northern illinois
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- engineer
I think if you look closely what the Transformer manufacturers sometimes called the universal Transformer has tap that you can make do this. They're made it basically take any of the common 50 60 hertz input voltages and make basically any output voltage out of it.
hbiss
EC, Westchester, New York NEC: 2014
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- Hawthorne, New York NEC: 2014
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- EC
It also says 220/240/380
I really think that you should wait until you get the machine. Most manufacturers build their equipment for the world market these days. I think you are worried about nothing.
-Hal
Maybe not. It isn't a very big transformer. But then I was used to getting nearly all our transformers custom made.
Wouldn't that give you 370V?
But I see what you are getting at.
Homes are almost entirely* 230V phase to neutral. In a typical suburban area, a number of homes are fed from a distribution transformer 11kV delta to 400V star, the star point being the neutral.
That's how it is in the UK. Italy, like all other countries in the EU, ought to be 4000/230 in accordance with the EU harmonised directive.
*Some very large mansions have a 3-phase supply. I know our lighting guys sometimes came across that.
mbrooke
Batteries Included
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- United States
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- Technician
Try these guys:
https://www.temcoindustrial.com/pro...pean-voltage-transformer-selection-guide.html
or these:
http://www.mgmtransformer.com/
208 delta to 230/400Y secondary.
https://www.temcoindustrial.com/pro...pean-voltage-transformer-selection-guide.html
or these:
http://www.mgmtransformer.com/
208 delta to 230/400Y secondary.
Tony S
Senior Member
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- Resting under the Major Oak UK
Someone should tell the DNO’s, they’re still fitting 433/250V transformers based on an allowable +10%
Why don't you be that someone?
mbrooke
Batteries Included
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- United States
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- Technician
Not to derail, but I agree with Tony. The UK is still 240 if not actually 250 while Russia/most of Europe are still 220/380. 230/400 is pretty much just an illusion to "harmonize" the two standards.
It may be a bit of a fidge, I agree. But the nominal is 400/230.
The specs for most/all of the industrial control panels and VSDs I dealt with for a good many years specify those voltages. In our works, the three phase was mostly on the low side of 400V and that came from a transformer next to our building. It was 1500kVA and belonged to the supply company. It might have been EON but I can't say for sure.
- Location
- Massachusetts
The last Italian industrial machine I wired was labeled 400/230.
If I recall the supply house was able to provide us a 575 delta to 480Y/277 transformer that we supplied with 480 delta and the resulting output was 400Y/230 more or less.
winnie
Senior Member
- Location
- Springfield, MA, USA
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- Electric motor research
IMHO, assuming that you don't need 50Hz, a dual winding transformer is the way to go, and you can 'simply' get a transformer wound for 208V primary and 380V secondary.
A 'buck-boost' arrangement is certainly possible, but won't really save you much in terms of transformer size or cost. The biggest reason to use a 'buck-boost' arrangement is the possibility of using standard 'off the shelf' transformers for the task.
Just because a particular voltage change isn't in the buck-boost selection tables does not mean you can't do it. A 'buck-boost' transformer is an ordinary transformer just connected differently, and they don't list all the possible connections.
For example, using a 120/240V to 16/32V transformer, you can take 120V and supply a single primary coil. Then you can connect the second 120V coil to get 240V, and finally use the 16V secondary to 'buck' back down to 224V. This is probably not the most efficient arrangement, just one that I could think of quickly.
Call one of the 'buck-boost' manufacturers to see if they can provide you with a transformer selection and a wiring diagram. Then you can decide if it makes more sense to use a buck-boost or a more custom dual winding transformer.
-Jon
A 'buck-boost' arrangement is certainly possible, but won't really save you much in terms of transformer size or cost. The biggest reason to use a 'buck-boost' arrangement is the possibility of using standard 'off the shelf' transformers for the task.
Just because a particular voltage change isn't in the buck-boost selection tables does not mean you can't do it. A 'buck-boost' transformer is an ordinary transformer just connected differently, and they don't list all the possible connections.
For example, using a 120/240V to 16/32V transformer, you can take 120V and supply a single primary coil. Then you can connect the second 120V coil to get 240V, and finally use the 16V secondary to 'buck' back down to 224V. This is probably not the most efficient arrangement, just one that I could think of quickly.
Call one of the 'buck-boost' manufacturers to see if they can provide you with a transformer selection and a wiring diagram. Then you can decide if it makes more sense to use a buck-boost or a more custom dual winding transformer.
-Jon
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