LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
It's my understanding that 220/240/250 volt services are supplied from wye systems.
Single Phase vs three phase
- Thread starter 3nd4
- Start date
- Status
kwired
Electron manager
- Location
- NE Nebraska
But those voltages are the line to neutral voltage on those systems, there is no ~120 volt available.
220V 50Hz
drcampbell
Senior Member
- Location
- The Motor City, Michigan USA
- Occupation
- Registered Professional Engineer
Yes, but we don't have confirmation that it's actually in Hong Kong, and it doesn't change the answer.
Single-phase loads can be powered from a three-phase supply, and only the capacity of the supply vs. the consumption of the load matters, not how it's configured.
Wherever you are, you can buy computers locally that are compatible with the local voltage. This would be an issue only if he were buying American or Canadian computers and installing them in Hong Kong. And maybe not even then because many computers are designed for 90-260 volts, 50-60 Hz.
a mod confirmed it was hong kong (they can see IP's, etc.)
really? a single ph load can be supplied from a 3 ph source?:lol:
how it is configured matters
3 100 A 1ph generators at 220 will not put out the same kva as 1 100 A 3ph at 220
Most residences here get single phase line to neutral that comes from a three phase source - the star secondary of a 3-phase distribution transformer.
A few palatial mansions and high rise buildings have a three phase supply but domestic/residential equipment is single phase 230V.
I imagine it's similar in Hong Kong. I worked on some variable speed drives for cooling pumps there and the supply was 400V 3-phase just as it would be here.
Last edited:
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Hong Kong is 380V 50Hz, there are both 3 wire and 4 wire systems available from their PoCo. So a 4 wire system would be 380Y220V, but there is no 220V 3 phase available (as standard).
I was betting on it being for Bitcoin mining, because those operations suck up a LOT of energy and it's possible (probable) that HK has started putting in power restrictions for real estate transactions, because the boom in Bitcoin mining is stressing their capacity for the entire city. That's actually happening all over China now. The servers would all be using 220V single phase power, so the RE agent was maybe feebly attempting to make it sound easier for the prospective client to get around the regulations by generating their own single phase power on-site, thinking that might sound more palatable than getting a 3 phase generator.
I was betting on it being for Bitcoin mining, because those operations suck up a LOT of energy and it's possible (probable) that HK has started putting in power restrictions for real estate transactions, because the boom in Bitcoin mining is stressing their capacity for the entire city. That's actually happening all over China now. The servers would all be using 220V single phase power, so the RE agent was maybe feebly attempting to make it sound easier for the prospective client to get around the regulations by generating their own single phase power on-site, thinking that might sound more palatable than getting a 3 phase generator.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Yes, I am aware of that, being L-N from a wye supply.
uh uh !!??!
hmy:j/k
pretty sure I had heard somewhere the huge power grid generators are 3 ph
and almost all residential loads are served single ph
ohmy what?uh uh !!??!
j/k
pretty sure I had heard somewhere the huge power grid generators are 3 ph
and almost all residential loads are served single ph
I'm not sure what exactly you are questioning.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
depends a lot on what type of flux capacitor is used.
you guys are saying that from a 3 ph system a neut can be derived and one leg and the neut (ergo 1 ph) can serve a load and that is common practice!?!?? get the heck outta here!!
:roll:
I contend that if you tried such craziness that life as we know it will cease to exist and that time will reverse
this is known as the 'benjamin button' effect
Last edited:
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Gotta be true, I read about it on facebook. Honest injun!
Got in one!
A 400V star (wye) secondary on the distribution transformer gives 230V line to neutral. The star point.
Done here and elsewhere all the time.
I don't understand what difficulty you have with that.
whoa cowboy!! hold your horses and simmer down!!! you are talkin' loco bro' !!!
if what you guys say is true then if you equally load all 3 phases with identical 1 ph loads the neut current would be 0!!!!!
where does it go!!!!
where.....does.........it.............gooooooooooo!!!!!!!!
:lol:
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
if there is no current then your electric bill is zero, right?
must be a different physics in the UK?!?!:happyyes:
do that on this side of the pond and some good ol' boys from homeland security will be at your door
no good will come of thatIt would sum to zero at the transformer star point, not the individual neutrals.
what!!?!?!
ok
take all 3 phases
tie them together
that serves the load
and the load return goes to the star centerpoint?
not in this inertial reference frame klaatu
- Status