The smart meter is installed on the low voltage network and is equipped with three independent LEM ART current sensors connected to the meter. This sensor technology allows the safe commissioning of the meter, on an existing live installation.
The ART Rogowski sensors are connected to the Power Meter located at the LV side of MV/LV transformers in the MV/LV substation. The software in the Power Meter calculates the thermal and electrical models of the transformer based on the LV measurements information, providing its oil temperature and ageing rate as well as MV current values and energy flows.
The Power Meter provides accuracy over a very wide dynamic range and over a large frequency bandwidth: the global accuracy of the measuring chain is better than 1%.
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ART - Flexible and tiny Rogowski coil, Class 0.5, IEC 61869-2
ATO - Split-core Transformer, Class 1 & 3, IEC 61869-2
Wi-LEM - Wi-LEM is a complete sub-metering network that is fast and easy to install