European Voltage??
- Thread starter stevee
- Start date
- Status
DetroitEE
Senior Member
- Location
- Detroit, MI
I don't see how a 400/277V system is possible. 277V comes from a line-to-neutral connection in a 480Y/277V.
In the US, I've heard of 415/240V in modern data center installs in the US. I think 400/230V may also be used, though I'm not sure.
I believe european countries are all 400/230V in three phase systems.
broadgage
Senior Member
- Location
- London, England
There is no simple way to make a 277/400 volt system.
There are only 2 common ways to make a multi-voltage system, single phase 3 wire or 3 phase 4 wire.
With a single phase 3 wire supply, the higher voltage is twice the lower one, a common example being the 120/240 volt residential service in the USA.
With a 3 phase 4 wire supply, the higher voltage is 1.7 times the lower voltage, for example 120/208 or 277/480.
Europe normally uses 3 phase 4 wire at a nominal 230/400 volts.
(the actual voltage tends to be nearer 240/415 in the UK and nearer 220/380 in mainland Europe.)
Less common European supplies include
3 phase 4 wire at 127/220 volt
3 phase 3 wire at 220 volt
3 phase 4 wire at 400/690 volt
1 phase 3 wire at 230/460 volt.
One could of course devise a single phase supply at 277/400 volts by means of a suitable transformer, and this might be done within equipment, but as a utilisation voltage ? I doubt it.
Perhaps a typo ? or the rating of some equipment that will accept a range of voltages from 277 up to 400 ?
There are only 2 common ways to make a multi-voltage system, single phase 3 wire or 3 phase 4 wire.
With a single phase 3 wire supply, the higher voltage is twice the lower one, a common example being the 120/240 volt residential service in the USA.
With a 3 phase 4 wire supply, the higher voltage is 1.7 times the lower voltage, for example 120/208 or 277/480.
Europe normally uses 3 phase 4 wire at a nominal 230/400 volts.
(the actual voltage tends to be nearer 240/415 in the UK and nearer 220/380 in mainland Europe.)
Less common European supplies include
3 phase 4 wire at 127/220 volt
3 phase 3 wire at 220 volt
3 phase 4 wire at 400/690 volt
1 phase 3 wire at 230/460 volt.
One could of course devise a single phase supply at 277/400 volts by means of a suitable transformer, and this might be done within equipment, but as a utilisation voltage ? I doubt it.
Perhaps a typo ? or the rating of some equipment that will accept a range of voltages from 277 up to 400 ?
kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
South Africa also uses 400Y/230V.
qcroanoke
Sometimes I don't know if I'm the boxer or the bag
- Location
- Roanoke, VA.
- Occupation
- Sorta retired........
400/690? that would probably hurt!!!!
donaldelectrician
Senior Member
220/360 stil in use ?
220/360 stil in use ?
BACK IN THE 80'S We wired some German used book binding equipment that was 220/360 3PH I believe we used 440/220 x-former tapped down?
Don " Outstanding Citizen of the Conch Republic"
220/360 stil in use ?
BACK IN THE 80'S We wired some German used book binding equipment that was 220/360 3PH I believe we used 440/220 x-former tapped down?
Don " Outstanding Citizen of the Conch Republic"
broadgage
Senior Member
- Location
- London, England
Indeed, it is not in very widespread use but has 2 main applications.
Firstly for very large scale lighting in sports stadia and the like. Ballasts for the largest discharge lamps are commonly designed for 400 volts, intended to be connected between phases of a 230/400 volt supply. They can therefore be connected phase to neutral in 400/690 volt system. The higher voltage reduces voltage drop and losses in cables.
The other main application is electric motors in extensive premises such as oil refineries. Most larger 3 phase motors have windings rated at 400 volts, being intended for delta connection to a 230/400 volt system.
They can also be connected in star (Y in USA terms) to a 400/690 volt system. Again there is a substantial saving in cable costs.
John Ramey
Member
Euro, S. Africa, actually much of the world outside of the American continents use 400/230v. Currently working overseas, and deal with it alot!
The following link will take you to the Army Technical manual TM 5-688. "Foreign Voltages and Frequencies Guide"
http://armypubs.army.mil/eng/DR_pubs/DR_a/pdf/tm5_688.pdf
No 400/277 volt systems in there. You could build a four phase 400/282 volt system.
.
Another source is the CIA World Fact Book.
https://www.cia.gov/library/publications/the-world-factbook/
http://armypubs.army.mil/eng/DR_pubs/DR_a/pdf/tm5_688.pdf
No 400/277 volt systems in there. You could build a four phase 400/282 volt system.
.Another source is the CIA World Fact Book.
https://www.cia.gov/library/publications/the-world-factbook/
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
The only thing I can think it could be is a transformer system with a custom tap arrangement, maybe specific to an OEM piece of equipment. I think I read in here once upon a time that old IBM mainframe computers used a 400V 50/60Hz input to the power supply rectifier so as to be universally connectible no matter where it was shipped. Maybe they were using 277V lighting on it too?
- Status