On Fri, 1 Nov 2019 01:46:00 -0700 (PDT), harry
wrote:

On Thursday, 31 October 2019 10:56:12 UTC, 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.

KWh, KVa and KVar meters (Spinning disk) are/were available.

Almost every commercial user in the UK with a max demand over 100 kVA will have
been on electronic metering, with remote 'dial-up' access, for around 20 years.

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