[OpenTRV-dev] OT: Voltage drops

[Stuart Poulton]

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

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>
>         <mailto:EMAIL ADDRESS HIDDEN
>         <mailto: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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