Potential Transformer

Kit Talich · 2006-01-19T19:43:48+00:00

Hello all! I am currently working on my senior design project of a DigitalPower Meter here at the South Dakota School of Mines and Technology(Shamless plug!). I plan to measure and display Voltage, Current, Powerand Power Factor. To do this I plan to sample both waveforms andcalculate the rest. I have found a Hall Effect type current sensingchip. While I have found a few 120V-5V PT's my personal requirementsare 230V 10A. Potential Transformers that accomplish this feat seem tobe a little more rare. Does anyone out there know of somewhere I canfind some of these? Small size would also be desired.P.S.: Gimme a JOB! B.S. EE minor:CSC

Jan 19, 2006 30 Replies

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Phil Allison 20 years ago

"John Larkin

** Big noting yourself like this does not work with me.

In fact, it makes you look like a pathetic jerk.

** Missed the point - yet again.

What a complete goose.

** I have been as specific as possible.

Better re-read the thread.

** More of Larkin's red herrings.

So the posturing clot has no knowledge of toroidal transformers either.

** Now the posturing clot comes around full circle.

Yawn.

** No it is not.

Try reading the OP's post properly.

Try reading any of mine properly.

Make a nice change.

.......... Phil

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John Larkin 20 years ago

Are you insulting the South Dakota School of Mines and Technology? That's not nice.

John

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John Popelish 20 years ago

Thank you.

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John Popelish 20 years ago

(hanging head in shame)-;

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Phil Allison 20 years ago

"John Larkin"

** Ass.

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John Larkin 20 years ago

Transformers aside, what sort of sample rates do you plan to run? Will you sample E and I simultaneously, or is there a single mux'd ADC? Any ideas on processing algorithms?

Getting an electronic meter to, say, the accuracy and dynamic range of a rotating-disk meter is surprisingly difficult; those puppies have probably had thousands of engineer-years applied to their development, and they are *good*.

John

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John Larkin 20 years ago

Does that mean it's *not* a school project?

John

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Kit Talich 20 years ago

Oh yes, sorry I failed to mention that another restriction I have set was to work strictly on 50-60Hz. Thus allowing the use of a PIC to sample the waveforms of each. This project ultimatly would be used to replace the current older wattmeters used in our labs. Thanks again!

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Kit Talich 20 years ago

This is a senior design project. To graduate we must design and build a product to graduate... so it is more like a project for school :D

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Joseph2k 20 years ago

Thank you Kit (OP), you put that stink fight to bed (without dessert).

JosephKK

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John Larkin 20 years ago

That makes the choice of sample rate much more interesting. The math here gets fun, relative primes and stuff, especially if you intend to display RMS current.

John

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