[OpenTRV-dev] OT: Voltage drops

Bo Herrmannsen EMAIL ADDRESS HIDDEN
Tue Jun 11 14:44:34 BST 2013


just for the fun of it here is how far i have come.... still some tracks
not there and a bit of clearance issues near the optoisolator




2013/6/11 Stuart Poulton <EMAIL ADDRESS HIDDEN>

> Ok.
>
> You should still design for 3 phase voltages. You should consider what
> would happen if the whole board were to become live.
>
> I'd be going with getting something like this installed
>
> http://www.shmmetershop.co.uk/**DAB13000-3-Phase-N-ABB-**
> DeltaPlus-MID-Approved-**Multifunction-meter-with-**Pulse-Output.html<http://www.shmmetershop.co.uk/DAB13000-3-Phase-N-ABB-DeltaPlus-MID-Approved-Multifunction-meter-with-Pulse-Output.html>
>
> Again, I still havn't heard what the perceived benefit of 'accurate
> voltage' measurement is ? How are you planning to measure current ?
>
> Stuart
>
> On 11/06/13 14:26, Bo Herrmannsen wrote:
>
>> 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...
>>
>> /bo
>>
>> 2013/6/11 Stuart Poulton <EMAIL ADDRESS HIDDEN <mailto:
>> EMAIL ADDRESS HIDDEN>**>
>>
>>     Ok.
>>
>>     Don't forget PCB design criteria change with 3 phase. You may find
>>     this of use
>>
>>     http://ww1.microchip.com/**downloads/en/DeviceDoc/51723a.**pdf<http://ww1.microchip.com/downloads/en/DeviceDoc/51723a.pdf>
>>
>>     Stuart
>>
>>     On 11/06/13 14:18, Bo Herrmannsen wrote:
>>
>>         yep, 3phase is standard here (almost) 3phases+neutral+earth
>>
>>         2013/6/11 Stuart Poulton <EMAIL ADDRESS HIDDEN
>>         <mailto:EMAIL ADDRESS HIDDEN> <mailto:EMAIL ADDRESS HIDDEN
>>         <mailto:EMAIL ADDRESS HIDDEN>**>>
>>
>>             Bo,
>>
>>             Can you clarify, are you talking about voltage and current
>>             measurement on a 3 phase supply ?
>>
>>             Thanks
>>
>>             Stuart
>>
>>
>>             On 11/06/13 14:07, Bo Herrmannsen wrote:
>>
>>                 hmm... i think you are right.. its the phase shift
>>         part that
>>                 will benefit most from what i'm doing
>>
>>
>>                 i will also agree to that 0-100A is rather a hughe
>>         step... for
>>                 me thats far beyound what i need, i can draw a max of
>>         16A amps
>>                 on each of the 3phases i got in the fuse box
>>
>>                 /bo
>>
>>
>>                 2013/6/11 Kevin Wood <EMAIL ADDRESS HIDDEN
>>         <mailto:EMAIL ADDRESS HIDDEN**com <EMAIL ADDRESS HIDDEN>>
>>                 <mailto:EMAIL ADDRESS HIDDEN**com<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**com <EMAIL ADDRESS HIDDEN>>>
>>                 <mailto:EMAIL ADDRESS HIDDEN**com<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**com <EMAIL ADDRESS HIDDEN>>
>>                 <mailto:EMAIL ADDRESS HIDDEN**com<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**com <EMAIL ADDRESS HIDDEN>
>> >>>>
>>
>>                     Indeed. Looking at the openenergy design, it's the
>>         current
>>                     monitoring side
>>                     that would be the largest source of error due to
>>         the fact
>>                 that it
>>                     lacks
>>                     resolution, especially at low power levels. A
>>         couple of
>>                 current ranges
>>                     rather than trying to do 0-100A in one range would
>>         help
>>                 there (I think
>>                     someone's proposed a design to do just that
>>         somewhere).
>>
>>                     Measuring mains voltage through an off-the-shelf
>>         step-down
>>                 transformer
>>                     with a purely resistive load takes us back into the
>>                 comfort zone
>>                     of most
>>                     constructors as far as safety goes and I can't
>>         believe it
>>                     introduces much
>>                     of an error if calibrated. Maybe a bit of phase
>>         shift and
>>                     flattening of
>>                     the top of the waveform if the transformer is a
>>         bit close to
>>                     saturation?..
>>                     Not sure. Will have to have a play with that.
>>
>>                     Kevin
>>
>>                     > I think the question here is what are the
>>         benefits of
>>                 'almost error
>>                     > free' mains voltage measurements ?
>>                     >
>>                     > Then compare to the risks, biggest being death,
>>         or fire.
>>                     >
>>                     > Stuart
>>                     > ______________________________**_________________
>>                     > OpenTRV-dev mailing list
>>                     > EMAIL ADDRESS HIDDEN**uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>                 <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>
>>                     <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>                 <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>>
>>                     > http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>                     >
>>
>>
>>                     ______________________________**_________________
>>                     OpenTRV-dev mailing list
>>         EMAIL ADDRESS HIDDEN**uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>                 <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>
>>                     <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>                 <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>>
>>         http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>>
>>
>>
>>                 ______________________________**_________________
>>                 OpenTRV-dev mailing list
>>         EMAIL ADDRESS HIDDEN**uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>                 <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>
>>         http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>>
>>             ______________________________**_________________
>>             OpenTRV-dev mailing list
>>         EMAIL ADDRESS HIDDEN**uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>             <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >>
>>         http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>>
>>
>>
>>         ______________________________**_________________
>>         OpenTRV-dev mailing list
>>         EMAIL ADDRESS HIDDEN**uk<EMAIL ADDRESS HIDDEN>
>>         <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>         http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>>
>>     ______________________________**_________________
>>     OpenTRV-dev mailing list
>>     EMAIL ADDRESS HIDDEN**uk <EMAIL ADDRESS HIDDEN>
>>     <mailto:EMAIL ADDRESS HIDDEN**opentrv.org.uk<EMAIL ADDRESS HIDDEN>
>> >
>>     http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>>
>>
>>
>> ______________________________**_________________
>> OpenTRV-dev mailing list
>> EMAIL ADDRESS HIDDEN**uk <EMAIL ADDRESS HIDDEN>
>> http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>>
>
> ______________________________**_________________
> OpenTRV-dev mailing list
> EMAIL ADDRESS HIDDEN**uk <EMAIL ADDRESS HIDDEN>
> http://lists.opentrv.org.uk/**listinfo/opentrv-dev<http://lists.opentrv.org.uk/listinfo/opentrv-dev>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opentrv.org.uk/pipermail/opentrv-dev/attachments/20130611/4840f962/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: givmon.png
Type: image/png
Size: 44186 bytes
Desc: not available
URL: <http://lists.opentrv.org.uk/pipermail/opentrv-dev/attachments/20130611/4840f962/attachment-0001.png>


More information about the OpenTRV-dev mailing list