oh forgot about current... if i was to use the method about messuring voltage and current i would messure the current with a clamp on each phase... in fact i allready have them installed...<br><br>feel a bit like a fool now that the pulse out might do the trick<br>
<br>only need to figure a sketch for it... still having a bit of work to do on my water meter that also has a pulse out<br><br><div class="gmail_quote">2013/6/11 Stuart Poulton <span dir="ltr"><<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Ok.<br>
<br>
You should still design for 3 phase voltages. You should consider what would happen if the whole board were to become live.<br>
<br>
I'd be going with getting something like this installed<br>
<br>
<a href="http://www.shmmetershop.co.uk/DAB13000-3-Phase-N-ABB-DeltaPlus-MID-Approved-Multifunction-meter-with-Pulse-Output.html" target="_blank">http://www.shmmetershop.co.uk/<u></u>DAB13000-3-Phase-N-ABB-<u></u>DeltaPlus-MID-Approved-<u></u>Multifunction-meter-with-<u></u>Pulse-Output.html</a><br>
<br>
Again, I still havn't heard what the perceived benefit of 'accurate voltage' measurement is ? How are you planning to measure current ?<br>
<br>
Stuart<br>
<br>
On 11/06/13 14:26, Bo Herrmannsen wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
oh.. no one board for each pahse.... i have 3 sockets over the fuse box.. clearly marked with what phase it goes to.... not excatly legal, but that part i can live with...<br>
<br>
/bo<br>
<br>
2013/6/11 Stuart Poulton <<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a> <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>><u></u>><br>
<br>
Ok.<br>
<br>
Don't forget PCB design criteria change with 3 phase. You may find<br>
this of use<br>
<br>
<a href="http://ww1.microchip.com/downloads/en/DeviceDoc/51723a.pdf" target="_blank">http://ww1.microchip.com/<u></u>downloads/en/DeviceDoc/51723a.<u></u>pdf</a><br>
<br>
Stuart<br>
<br>
On 11/06/13 14:18, Bo Herrmannsen wrote:<br>
<br>
yep, 3phase is standard here (almost) 3phases+neutral+earth<br>
<br>
2013/6/11 Stuart Poulton <<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a><br>
<mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>> <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a><br>
<mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>><u></u>>><br>
<br>
Bo,<br>
<br>
Can you clarify, are you talking about voltage and current<br>
measurement on a 3 phase supply ?<br>
<br>
Thanks<br>
<br>
Stuart<br>
<br>
<br>
On 11/06/13 14:07, Bo Herrmannsen wrote:<br>
<br>
hmm... i think you are right.. its the phase shift<br>
part that<br>
will benefit most from what i'm doing<br>
<br>
<br>
i will also agree to that 0-100A is rather a hughe<br>
step... for<br>
me thats far beyound what i need, i can draw a max of<br>
16A amps<br>
on each of the 3phases i got in the fuse box<br>
<br>
/bo<br>
<br>
<br>
2013/6/11 Kevin Wood <<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a><br>
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<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a><br>
<mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>>>>><br>
<br>
Indeed. Looking at the openenergy design, it's the<br>
current<br>
monitoring side<br>
that would be the largest source of error due to<br>
the fact<br>
that it<br>
lacks<br>
resolution, especially at low power levels. A<br>
couple of<br>
current ranges<br>
rather than trying to do 0-100A in one range would<br>
help<br>
there (I think<br>
someone's proposed a design to do just that<br>
somewhere).<br>
<br>
Measuring mains voltage through an off-the-shelf<br>
step-down<br>
transformer<br>
with a purely resistive load takes us back into the<br>
comfort zone<br>
of most<br>
constructors as far as safety goes and I can't<br>
believe it<br>
introduces much<br>
of an error if calibrated. Maybe a bit of phase<br>
shift and<br>
flattening of<br>
the top of the waveform if the transformer is a<br>
bit close to<br>
saturation?..<br>
Not sure. Will have to have a play with that.<br>
<br>
Kevin<br>
<br>
> I think the question here is what are the<br>
benefits of<br>
'almost error<br>
> free' mains voltage measurements ?<br>
><br>
> Then compare to the risks, biggest being death,<br>
or fire.<br>
><br>
> Stuart<br>
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