Electronics > Beginners

Safest way to measure AC mains 220-250 voltage?

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james_s:
My energy monitor is powered by a small AC output unregulated wall wart, it's just a transformer. That's the safest way I can think of and it works well enough. As long as the load on the transformer is not too variable the result should be quite accurate.

soldar:
If what you want is a transducer that will output a standard 0 - 5 V or 4 - 20 mA you can find commercially built units and unless they are very expensive you are better off just buying something off the shelf.

https://www.set-transducer.com/CurrentTransducer.html?RC=5

You can also find them for voltage and other physical magnitudes.

ogden:

--- Quote from: paulca on July 17, 2019, 09:18:22 am ---I intend to install a DIY mains electric monitor (or several) in my distribution board / meter box.

--- End quote ---

You shall start reading electricity meter reference designs:

http://www.ti.com/solution/smart-e-meter-amr-ami
https://www.st.com/en/applications/metering/single-phase-meter.html

james_s:
The proper device is called a potential transformer, however in practice any ordinary mains frequency power transformer is likely to be good enough. It only needs to be accurate over a range of say +/-20% at most.

soldar:
I may be mistaken but I believe the OP is looking for transducers which will convert AC voltage and AC current into DC signals proportional to the RMS values of the originals and which can then be fed and measured.

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