The most common type of electricity meter is the electromechanical induction watt-hour meter.
The electromechanical induction meter operates by counting the revolutions of a non-magnetic, but electrically conductive, metal disc which is made to rotate at a speed proportional to the power passing through the meter. The number of revolutions is thus proportional to the energy usage. The voltage coil consumes a small and relatively constant amount of power, typically around 2 watts which is not registered on the meter
Power consumption of individual meter is less than 0.5 watts.
Digital meters are more precise than any other types of meters.
But digital meters could have a power consumption of 1-3 Watt, depending on their extra functionalities who are integrated in the meter. Generally the power source may be taken from the measurement VT's or via an auxiliary input.
Relevant technical data may easily be found in the technical leaflets of numerical/digital energy meters.
Your opinion is similar to mine, i work with power consumption of induction meter of 2-2,5 W and for digital meters i work with 0,5 W. That's all general and depends on manufacturer but i think those values are approximately correct for no load losses calculation in 0,4 kV network...!
In my opinion these values are slightly higher than actual
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