Electricity consumption of electric meter

As long as each watt-hour meter is energized, it will lose power itself. This loss is a fixed value in theory and will not increase with the increase of electricity consumption. This self-loss cannot be measured by the meter itself. The master meter will measure the loss of the sub-meters.

Generally, the loss of electricity meter itself is once or twice a month. Because the loss is only one or two degrees a month and the power is quite small, the accuracy that household electronic instruments can achieve is incalculable.

The self-loss of electric energy meter is mainly the loss of voltage coil. Taking the voltage coil of a 220V single-phase watt-hour meter as an example, the power loss is about 1W, so it is correct to add one kilowatt-hour (1KWh) to the reading of the watt-hour meter every month, (1W*24h*30 days =0.72KWh), if it is a three-phase four-wire watt-hour meter,

Extended data:

When the electric energy meter is connected to the circuit under test, alternating current flows in the current coil and the voltage coil, and these two alternating currents generate alternating magnetic flux in their iron cores respectively; The alternating magnetic flux passes through the aluminum disk and induces eddy current in the aluminum disk; The eddy current is forced in the magnetic field, which makes the aluminum disk gain torque (active torque) and rotate.

The greater the power consumed by the load, the greater the current flowing through the current coil, the greater the eddy current induced in the aluminum disk, and the greater the torque that makes the aluminum disk rotate. That is, the torque is proportional to the power consumed by the load.

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