Potential Transformer
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From: Rich Grise on 19 Jan 2006 19:14 On Thu, 19 Jan 2006 11:43:48 -0800, Kit Talich wrote: > Hello all! > > I am currently working on my senior design project of a Digital > Power Meter here at the South Dakota School of Mines and Technology > (Shamless plug!). I plan to measure and display Voltage, Current, Power > and Power Factor. To do this I plan to sample both waveforms and > calculate the rest. I have found a Hall Effect type current sensing > chip. While I have found a few 120V-5V PT's my personal requirements > are 230V 10A. Potential Transformers that accomplish this feat seem to > be a little more rare. Does anyone out there know of somewhere I can > find some of these? Small size would also be desired. > > > P.S.: Gimme a JOB! B.S. EE minor:CSC If you want to measure potential, how about a - may I have a drum roll please - voltage divider and ADC? You _do_ have a common ground reference, haven't you? Good Luck! Rich P.S.: Employ me, and I'll help you reassimilate into Real Life. ;-)
From: Phil Allison on 19 Jan 2006 19:33 "Kit Talich" <Oxmmdox(a)gmail.com> wrote in message news:1137699828.652879.244910(a)f14g2000cwb.googlegroups.com... > Hello all! > ** Beware - gmail and Google Groupie !!! > I am currently working on my senior design project of a Digital > Power Meter here at the South Dakota School of Mines and Technology > (Shamless plug!). I plan to measure and display Voltage, Current, Power > and Power Factor. To do this I plan to sample both waveforms and > calculate the rest. I have found a Hall Effect type current sensing > chip. While I have found a few 120V-5V PT's my personal requirements > are 230V 10A. Potential Transformers that accomplish this feat seem to > be a little more rare. Does anyone out there know of somewhere I can > find some of these? Small size would also be desired. ** Where did the "10A" come from ?? Or did you mean to say V ? A small toroidal transformer would be ideal to derive a scaled and isolated AC supply voltage - but do not use it for powering the device sine the addition of a rectifier circuit will clip the waveform. ......... Phil
From: Phil Allison on 19 Jan 2006 19:36 "John Popelish" > > If so, you might look at some toroidal transformers with dual primaries > (115-230). They have quite good voltage regulation under light load. ** That last bit looks like a tautology. ............ Phil
From: Pooh Bear on 19 Jan 2006 19:50 Rich Grise wrote: > On Thu, 19 Jan 2006 11:43:48 -0800, Kit Talich wrote: > > > Hello all! > > > > I am currently working on my senior design project of a Digital > > Power Meter here at the South Dakota School of Mines and Technology > > (Shamless plug!). I plan to measure and display Voltage, Current, Power > > and Power Factor. To do this I plan to sample both waveforms and > > calculate the rest. I have found a Hall Effect type current sensing > > chip. While I have found a few 120V-5V PT's my personal requirements > > are 230V 10A. Potential Transformers that accomplish this feat seem to > > be a little more rare. Does anyone out there know of somewhere I can > > find some of these? Small size would also be desired. > > > > > > P.S.: Gimme a JOB! B.S. EE minor:CSC > > If you want to measure potential, how about a - may I have a drum roll > please - voltage divider and ADC? > > You _do_ have a common ground reference, haven't you? How about a patent on that ? Graham
From: John Larkin on 19 Jan 2006 20:06
On 19 Jan 2006 11:43:48 -0800, "Kit Talich" <Oxmmdox(a)gmail.com> wrote: >Hello all! > > I am currently working on my senior design project of a Digital >Power Meter here at the South Dakota School of Mines and Technology >(Shamless plug!). I plan to measure and display Voltage, Current, Power >and Power Factor. To do this I plan to sample both waveforms and >calculate the rest. I have found a Hall Effect type current sensing >chip. While I have found a few 120V-5V PT's my personal requirements >are 230V 10A. Potential Transformers that accomplish this feat seem to >be a little more rare. Does anyone out there know of somewhere I can >find some of these? Small size would also be desired. > > Use a resistibe voltage divider. Or a series resistor into a small audio-type transformer, operated in current mode. Or any ole 240-to-6 or whatever transformer. You'll probably have to to a phase tweak somewhere in the system anyhow. >P.S.: Gimme a JOB! B.S. EE minor:CSC Gimmie a resume! John |