Watt-hour meter, also called watt-hour meter, refers to the instrument that measures various electrical quantities.  With the rapid development of China's economy, the demand for electricity in all walks of life is increasing.  

The imbalance of electricity consumption at different times is also becoming more and more serious.  In order to alleviate the increasingly sharp contradiction between power supply and demand in China, adjust the load curve and improve the imbalance of electricity consumption, Implement the time-of-use electricity price system of peak, flat and valley comprehensively, "peak cutting and valley filling" to improve the electricity efficiency of the country, and make reasonable use of power resources. The electric power department of some provinces and cities in China has gradually introduced the multi-rate electricity meter to charge the electricity consumption by time.  Today, electricity meters are used in every aspect of our lives. Now,let the editor introduce the working principle and classification of electricity meters?

I. Working principle of watt-hour meter:

When the watt-hour meter is connected to the circuit, the magnetic flux generated by the voltage and current coils passes through the disc, and these fluxes are in different phases in time and space, and eddy currents are induced on the disc respectively, Due to the interaction of magnetic flux and eddy current, the rotating torque is generated to make the disc rotate, and due to the braking effect of the magnet, the rotation speed of the disc reaches uniform motion. Since the magnetic flux is proportional to the voltage and current in the circuit, the disc moves at a speed proportional to the load current under the action of the disc. The number shown on the meter is the actual amount of electrical energy used in the circuit.

II. Classification of electricity meter:

According to the working principle can be divided into mechanical type and electronic type;

According to the circuit can be divided into AC and DC, the AC power meter can be divided according to the phase line: single phase electronic meter, three phase three wire electronic meter, three phase four wire electronic meter;

Wiring mode: via transformer access type and direct access type;

According to the use can be divided into active power, reactive power, prepaid power meter, Muti-rate(time-of-use)watt hour meter, loss power meter and multi-functional electricity meter;

Measurement accuracy: 0.2S class   0.5S class   0.5 class   1.0 class   2.0 class.

The Regulations on the Management of External Energy Supply of the Power metering Department requires that the electrometer accuracy of the external supply users shall not be less than level 1.0;

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