[OpenTRV-dev] OT: Voltage drops

[Bo Herrmannsen]

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>

> 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>**>
>>
>>     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>
>> >>>
>>
>>             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
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