Hello,

Because you are mesuring AC mains the best way is with coil pickups. Each =
phase wire passes through a coil pickup this produces a current on the =
pickup coil in a fixed ratio to the current in the phase wire.

There are 600A ones available. The output voltage would typical be 10V AC =
full scale, dependent on ratio & pickup coil load I think?

The advantage of this method is there is no electrical contact with any of =
the phases or neutral.=20

regards Peter Wintulich=20

>>> Adam Smith <adam@VIRATECH.COM> 06/18/02 12:24PM >>>
Josh,

Why not get a 1 ohm or likewise crazy low value resistor, and then
measure the voltage drop across it?  It doesn't take that much to
measure 600V...600A across 1 ohm would give you that.  If you can find
an accurate ohm meter then you're good to go (i.e. count resistance of
wires, etc.).

What kind of wire is rated for 600A, anyway?!  (wow!)

Regards,
Adam Smith

> -----Original Message-----
> From: adam-request@viratech.com [mailto:adam-request@viratech.com] On
> Behalf Of Josh Koffman
> Sent: Monday, June 17, 2002 10:10 PM
> To: PICLIST@MITVMA.MIT.EDU=20
> Subject: Re: [PIC]: PIC High Current Meter
>
> Along these lines, anyone have any idea how hard it would be to make a
> PIC based high current meter for three phase? Something that would
> measure say, up to 600A per phase. Doesn't have to be super accurate.
I
> don't know how I'd detect the current. I kinda wrote off the project
due
> to complexity, but this project gives me some hope. Also, there is a
> cheap current meter available at RadioShack for about $17, but it only
> measures up to about 30A. I thought about stealing the sensor from it.
> The only problem is I'd need 3 of them. On the up side, they have a
> fairly wide mouth, and it's a clamp style. I'd like to have a PIC that
> measures all three phases, then transmits the data over RS485 to
another
> PIC which displays it.
>
> Any suggestions?
>
> Thanks,
>
> Josh
> --
> A common mistake that people make when trying to design something
> completely foolproof is to underestimate the ingenuity of complete
> fools.
>         -Douglas Adams
>
> Tony Nixon wrote:
> > The quality is not 100% but it's readable. As you might imagine,
> > scanning 10 pages from a colour magazine results in a large file, so
I
> > reduced the images slightly and resampled at 16 bit color.
> > http://www.bubblesoftonline.com/curmet.pdf=20
> > If you think it's unreadable then I will try to sharpen the images
> > before converting.
> > Here is the link to Silicon Chip and the source code for the PIC.
> > http://www.siliconchip.com.au/software/jun02/ammeter.zip=20
>
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