single phase to 3-phase
- Thread starter c.c
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- Massachusetts
Without knowing the voltage there is no way to determine the size.
But no single transformer can make 3 phase from single phase, at least as far as I know.
But no single transformer can make 3 phase from single phase, at least as far as I know.
Minnesotaelectric
Member
What type of load is it? If it is a motor load, maybe consider using a vfd.
drbond24
Senior Member
- Location
- Barboursville, West Virginia
mivey
Senior Member
3 phase kVA = amps * sqrt(3) * V_line-to-line / 1000
3 phase kVA = 100 * sqrt(3) * V_l-l / 1000 = 0.1732 * V_l-l
But, as iwire pointed out, they don't make a single transformer that does that. You would think somebody might come up with a a 120/208 version, but I don't recall seeing one.
The problem with single phase to three phase, is that you need at least two voltages that do not lie along the same axis. Most single-phase is from a center-tapped transformer, and the neutral point lies along the vector of the line-line voltage.
The 120/208 has a neutral point that does not lie on the vector of the line-line voltage and is a candidate for deriving three phase. I don't know that anybody actually does it.
3 phase kVA = 100 * sqrt(3) * V_l-l / 1000 = 0.1732 * V_l-l
But, as iwire pointed out, they don't make a single transformer that does that. You would think somebody might come up with a a 120/208 version, but I don't recall seeing one.
The problem with single phase to three phase, is that you need at least two voltages that do not lie along the same axis. Most single-phase is from a center-tapped transformer, and the neutral point lies along the vector of the line-line voltage.
The 120/208 has a neutral point that does not lie on the vector of the line-line voltage and is a candidate for deriving three phase. I don't know that anybody actually does it.
mistabass
Member
- Location
- Rhode Island
hi all new to site just wanted to say hi i have used a phase convertor had single phase service and 3phase mahines worked out great the one i used was 60 amp do think they make bigger ones
Welcome to The Forum.
You could possibly use the old formula of 58% inverted.
You would have to have two hots for phase differential and would do well to talk to a rewind shop, or VFD manufacturer for whatever purpose you have in mind for this application.
You could possibly use the old formula of 58% inverted.
You would have to have two hots for phase differential and would do well to talk to a rewind shop, or VFD manufacturer for whatever purpose you have in mind for this application.
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