On 01/11/2019 01:09, John Rumm wrote:
On 31/10/2019 20:27, Andy Burns wrote:
John Rumm wrote:

Domestic meters have historically been quite good at measuring only
the instantaneous real power transfer, and ignoring reactive
currents. How good they are with with modern loads with poor power
factors caused by high harmonic content (like many small SMPSUs)
rather than a more traditional phase shift is perhaps a more
interesting question.

Ask a Dutch university?

I don't follow, what have I missed?

Possibly a reference to the study by universities in the Netherlands[1]
which reported smart meters giving false readings. BEAMA commented at
the time that no meters installed in the UK were like those the study
showed to have problems[2]. Others commented that the study used rather
unrealistic loads - e.g. 20 non-dimmable CFLs and 20 non-dimmable LEDs
on a 10A dimmer.


[1]
https://www.utwente.nl/en/news/2017/3/313543/electronic-energy-meters-false-readings-almost-six-times-higher-than-actual-energy-consumption

[2]
http://www.beama.org.uk/news/beama-response-to-ieee-article-on-accuracy-of-dutch-electricity-meters.html


--
Robin
reply-to address is (intended to be) valid