Electronic Energy Meters’ False Readings Almost Six Times Higher Than Actual Energy Consumption
March 4th, 2017Via: Science Bulletin:
Some electronic energy meters can give false readings that are up to 582% higher than actual energy consumption. This emerged from a study carried out by the University of Twente (UT), in collaboration with the Amsterdam University of Applied Sciences (AUAS). Professor Frank Leferink of the UT estimates that potentially inaccurate meters have been installed in the meter cabinets of at least 750,000 Dutch households. The is published in the scientific journal IEEE Electromagnetic Compatibility Magazine.
In the Netherlands, traditional energy meters (kWh) — the familiar energy meter with a rotating disc — are being increasingly replaced by electronic variants (which are also known as ‘static energy meters’). One well-known variant of the latter is the ‘smart meter’. The Dutch government wants smart meters in every household by 2020.
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The meters were connected, via an electric switchboard, to a range of power-consuming appliances, such as energy saving light bulbs, heaters, LED bulbs and dimmers. The researchers then compared the actual consumption of the system with the electronic energy meter’s readings.
582 percent
In the experiments (which were entirely reproducible), five of the nine meters gave readings that were much higher than the actual amount of power consumed. Indeed, in some setups, these were up to 582 percent higher. Conversely, two of the meters gave readings that were 30 percent lower than the actual amount of power consumed.
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.”
