In daily life, residents must need to install electricity meters as long as they use electricity, but many residents do not understand the use of electricity meters. Power meter is a common electrical component in our life, also known as electrical meter. According to the different use of electricity and the environment, the type of electricity meter is also different. So what are the commonly used electricity meters?Let the editor to introduce the classification and common types of electricity meters?

I.Classification of electricity meter:

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

2. 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;

3. 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;

II.What are the common types of electric energy meter?

1. Induction meter:

Definition: induction meter is based on electromagnetic induction, used to measure a special instrument, because it uses all mechanical components, so it is also called mechanical electric energy meter.

Structure composition: it is mainly composed of the meter, rotating element (aluminum disk or turntable), drive element, brake magnet, upper and lower bearing, base frame, end knob box, etc.The driving element mainly includes a voltage coil, a current coil, and a high-speed device, etc.

Operating principle: when the voltage coil of the electric energy meter passes through the rated voltage and the current coil passes through the rated current, the voltage coil and the current coil produce the voltage working flux and the current working flux at different positions and the phase angle in space. They each empty through the aluminum disc and each generate inductive vortices in the aluminum disc.The voltage working magnetic flux and the induced vortex flow generated by the current working magnetic current interact between the current working magnetic flux and the induced eddy current centered on the aluminum disk rotation axis, and the aluminum disk of the electric energy meter always rotates in one direction.Aluminum disk in rotation, cut the magnetic line of the brake magnetic field iron, so that on the aluminum disk and produced a braking torque opposite to the rotation direction, when the two moments balance, the aluminum disk will turn at a uniform speed in one direction, and then the speed through the worm and worm wheel, to the gear of the meter, so as to drive the word wheel rotation to achieve the purpose of measurement.The speed of rotation is proportional to the power input.

2.Electronic meter:

Definition: Electronic meter is a special instrument for measuring electric energy based on microelectronics circuit. It is also known as static electric energy meter.

Structure composition: it is mainly composed of input level, multiplier, P / f transformation circuit and count, display, and controller, where the input level is mainly composed of voltage or current transformer, precision divided piezo cathode or sampling resistance.

Operating principle: firstly,change the measured high voltage (generally tens of volts (tens of millivolts) through the input level, and then through the multiplier, then change the multiplier output into the voltage (or current) signal with the frequency is proportional to the size of the measured power.

In this way, by counting the pulses per unit of time, the power size can be measured. The power value can be measured by counting, displaying, and controllers accumulating standard pulses proportional to the power, and is displayed.

3.Electromechanical pluse electronic watt hour meter

Definition: an electric power meter composed of mechanical components (i. e., the induction system measuring mechanism) and electronic components (i. e., photoelectric converter, frequency converter and counter components), which is called a mechanical and electrical power meter.

Structure composition: the mechanical and electrical pulse electronic power meter is mainly composed of the induction system measuring mechanism, photoelectric converter, frequency divider and counter.

The role of each component: the main function of the induction system measuring mechanism is to transform the electric energy signal into the rotation number of the turntable, whose working principle is the same as the inductive electric energy meter.

The function of the photoelectric converter is to convert the number of turntable proportional to electric energy into electric pulses.

The main function of the frequency divider and counter is to frequency-divide and count the pulse signal converted into photoelectric light, so as to obtain the electrical energy used.

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