Single phase to 3 phase duplication
Single phase to 3 phase duplication
(OP)
I have a unit that monitors 3 phase voltages, currents, etc. Is there a off the shelf device that will take single phase 120VAC and convert/dummy 3 phase? I would like to make a test box that will produce 3 phase from single phase, this way I can demo the monitoring device to show the values.
thanks in advance,
Drax
thanks in advance,
Drax






RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
thanks
RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
We market a three-phase power monitor, and did the same search you are doing for a sales demo. Wound up designing our own, didn't cost much but there really wasn't anything cheap out there. The UPS is the next-best alternative.
Good luck!
Old Dave
RE: Single phase to 3 phase duplication
Possible solutions:
1.) Phase shift with or without transformer
2.) VFD.
<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032
RE: Single phase to 3 phase duplication
http://www.fortier.qc.ca/anglais1.htm
RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
I used to work for a small but long standing company who made volt, current, and power monitors. Above, is exactly how we demo'd the unit.
Drax, Is this a new company? Just curious. I have thought about getting back into this type of work for a while now since I hate dealing with power generation (at least right now).
RE: Single phase to 3 phase duplication
could work but some of those new relays depend on phase differences - all the same the relay would fault out.
Id be inclined to use a motor generator set - if you are only doing lowish currents and such then i would consider using a car alternator - it produces three phases and drive this from a motor being driven from the mains. Could make this up really cheap from old parts.
Rugged
RE: Single phase to 3 phase duplication
RE: Single phase to 3 phase duplication
As I said, (maybe its not clear) most of the functions can be simulated by using pots and switches. Of course, this demo unit would not function in the field if you had to sell it as the micro would be different. To simulate an overvoltage, let the user turn a pot and read this with your onboard A/D and send this information to the registers that normally hold the voltage reading. The same would apply for other functions. Flip a switch, it simulates the loss of a phase, etc..
I dont see why a relay or monitor is going to make any difference. Depending on the complexity of the relay you may not be able to simulate all the functions, even with a three phase supply (overcurrent for example - hate to see the salesman running around with 100 + amps running in there demo case).
RE: Single phase to 3 phase duplication
120V input might be more convenient. http:
Look portable to me. Don't know what they cost, but they'll provide true three phase if it's really required.
RE: Single phase to 3 phase duplication
Cool little drive though. One of the problems with using this for a voltage relay is the zero crosses will all be hashed up so better have some output filtering or I will bet your device will get 'confused', especially if using the averaging method to calculate the rms voltage (will not work for sure if this is the case). Zero crosses are often used for calculating the frequency as well as the pf. In addition, it is sometimes used for timing functions within the relay (depends on the design). But definately check with the designer of this and will bet money that it wont work on a drive (at least the voltage and power part of it) unless your a competitor to SEL, Basler, etc, even theirs, I dont think will work on the output of a drive.