Giulio
I could go into a long discourse about measuring AC, but the simple
truth is that this is something to be taken very seriously. Since you
say there are high currents involved, it is a completely lethal
situation as well as a potential fire risk. Unless you are completely
sure of what you are doing and have total buy in from the site
electricians and engineers, this is not something to be building
yourself. I do code compliant residential and light industrial
electrical work and would never dream of cobbling together anything in
the setting you describe.
Once you make this leap, then we can look at systems that can do what
you want and look at how to integrate them into your monitoring.
For things like this, it is often better to start what you are trying to
do, since that almost always drives what can be used to accomplish the
task. Monitoring AC is a wide field (sorry for the pun) and we need a
bit more understanding.
Pulse output power meters have already been mentioned, and are really
the place to start. These put out a pulse for every so many electrons
that pass. These can be collected by a few different 1-wire counters
with little or no added circuitry and are totally safe to work with. It
helps to put a bit of software logic in to deal with the low power
situation, since you are getting infrequent pulses.
Smart meters and power measurement systems will give multiple types of
data. These are mostly accessed via serial, ethernet and/or wireless, so
you will need to fold that back into your monitoring system separately
from the 1-wire. These can be quite modest in price (by my thinking) and
can be found in the US at around $200. The electrician's cost of wiring
them up will be more than the cost of the unit.
jerry
On 05/24/2013 11:27 AM, Giulio Carabetta wrote:
Hello!
I'm thinking about a new project, about monitoring AC power lines, in
industrial environment (tipically AC 220@50Hz, hi current...).
I have some little experience with owfs, and I'm reading this list
from a lot, so I was thinking about a solution with a linux based
small hardware (like raspberry or arduino or odroid, ecc).
I remember I read something like this, maybe with DS2450 (no longer
available?) or also with DS2438. But I don't know how this is
applicable, for the measurement and for an industrial production area.
Can be better to move to i2c? I've seen some "power and energy
measurement IC", even from Maxim, with I2C bus, but it will be totally
new for me.
And, to make more complicated all, I must admit that I'm not so strong
on the electric/electronic side... :)
Any suggestion will be very appreciated
Many thanks
Giulio
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