Electric energy meters have been around for over 100 years. From inductive energy meters to electronic energy meters, after entering the 21st century, it has entered the era of smart energy meters. In addition to the traditional functions of electric energy metering and billing for power customers and power companies, smart energy meters are also an effective tool for power information communication and power supply service interaction, and are the basis for smart grids and smart power consumption.
What is an energy meter?
Electric energy meter realizes the measurement of active electric energy, also known as kilowatt-hour meter, watt-hour meter, fire meter, electric energy meter is a special measuring instrument, used to measure the cumulative value of electricity in a certain period of time, the unit is kilowatt-hour, commonly known as degree.
According to the accuracy level, the electric energy meter can be divided into ordinary installation electric energy meter (divided into 2, 1, 0.5S, 0.2S level), standard electric energy meter (divided into 0.2, 0.1, 0.05, 0.02 level); according to the number of phases Classification, electric energy meters are divided into single-phase electric energy meters, three-phase three-wire electric energy meters and three-phase four-wire electric energy meters; according to the working principle, electric energy meters are divided into inductive electric energy meters and electronic electric energy meters, and electronic electric energy meters are divided into Ordinary electronic energy meters, multi-function energy meters and smart energy meters, etc.; according to the access method, the energy meters are divided into direct access type and transformer access type, direct access type is used for occasions with a voltage of 220 volts The indirect type is used in the occasions where the voltage level is high and must be connected through the transformer.
What is an inductive energy meter?
Inductive energy meters are also known as mechanical energy meters. Although there are many types and models of inductive electric energy meters, the basic structure is similar, and they are composed of two parts: measuring mechanism and auxiliary parts. The measuring mechanism is the core part of the electric energy meter to realize the electric energy measurement, including the electromagnetic driving element, the rotating element, the braking element, the bearing and the meter, etc. The electromagnetic drive element includes voltage element and current element, the rotating element is composed of a turntable and a rotating shaft, and the braking element is composed of a permanent magnet and an adjustment device. The quality of the bearing has an important influence on the accuracy and service life of the electric energy meter. Auxiliary parts include base frame, base, watch cover, nameplate, etc.
The working principle of the inductive electric energy meter is to convert the alternating voltage and current into an alternating magnetic flux passing through the turntable through the voltage element and the current element. The turntable turns. The braking torque generated by the braking element makes the rotation speed of the turntable proportional to the power of the circuit under test. The number of turns of the turntable is transmitted to the counter, which is the indicating part of the electric energy meter. Compared with the single-phase inductive electric energy meter, the three-phase inductive electric energy meter has two or three groups of electromagnetic driving elements, and the electromagnetic driving torques generated by them act together on a rotating element, and the total electric energy is indicated by a meter.
Due to its simple structure, safety and durability, and easy mass production and maintenance, inductive electric energy meters have developed rapidly and played an important role in the field of AC electric energy measurement. However, with the rapid growth of electricity consumption and the increasingly intensified contradiction between energy supply and demand, electric energy meters are required to have more functions, not only for electric energy measurement, but also for management.