Electronic Energy Meters' False Readings Almost Six Times Higher than Actual Readings

["Dave Farber" <dave () farber net>]

---------- Forwarded message ---------
From: Lauren Weinstein <lauren () vortex com>
Date: Mon, Mar 6, 2017 at 11:31 AM
Subject: [ NNSquad ] Electronic Energy Meters' False Readings Almost Six
Times Higher than Actual Readings
To: <nnsquad () nnsquad org>



Electronic Energy Meters' False Readings Almost Six Times Higher than
Actual Readings

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

        The greatest inaccuracies were seen when dimmers combined with
        energy saving light bulbs and LED bulbs were connected to the
        system.  According to Mr Keyer (lecturer Electrical
        Engineering at the AUAS and PhD student at the UT) "OK, these
        were laboratory tests, but we deliberately avoided using
        exceptional conditions. For example, a dimmer and 50 bulbs,
        while an average household has 47 bulbs."  The inaccurate
        readings are attributed to the energy meter's design, together
        with the increasing use of modern (often energy-efficient)
        switching devices. Here, the electricity being consumed no
        longer has a perfect waveform, instead it acquires an erratic
        pattern. The designers of modern energy meters have not made
        sufficient allowance for switching devices of this kind. When
        they dismantled the energy meters tested, the researchers
        found that the ones associated with excessively high readings
        contained a 'Rogowski Coil' while those associated with
        excessively low readings contained a 'Hall Sensor'.  Frank
        Leferink (Professor of Electromagnetic Compatibility at the
        UT) points out that "The energy meters we tested meet all the
        legal requirements and are certified.  These requirements,
        however, have not made sufficient allowance for modern
        switching devices".

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