[OpenTRV-dev] OT: Voltage drops

[Bo Herrmannsen]

yep, 3phase is standard here (almost) 3phases+neutral+earth

2013/6/11 Stuart Poulton <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>>>
>>
>>     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>
>> >
>>     > 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/20130611/1e2875ce/attachment-0001.html>