What are the main categories of commonly used electric energy meters?

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1. According to accuracy level: Ordinary level: 0.2S, 0.2, 0.5S, 0.5, 1.0, 2.0, 3.0 levels, used to measure electrical energy. Precision level: Levels 0.01 and 0.05 are mainly used as calibration standards for calibrating ordinary energy meters. 2. According to the average life span, single-phase induction energy meters are divided into: Standard and long-life technical energy meters. According to regulations, ordinary induction energy meters must be randomly inspected after five years of use. When the random inspection fails, they must be rotated. Long-life technical energy meters refer to induction energy meters with an average effective use time of 20 years or more without repair. 3. According to structure and working principle: 1. Inductive energy meter. 2. Electronic energy meter. Electronic energy meters can be further divided into fully electronic energy meters and electromechanical pulse energy meters. 4. According to the nature of the access power supply, it can be divided into: AC energy meter and DC energy meter. 5. According to purposes: 1. Reactive energy meter. It is used to measure the reactive energy of electricity generation, supply and consumption. 2. Multifunctional electric energy meter. In addition to measuring active (reactive) energy, it also has two or more functions such as time sharing and demand measurement, and can display, store and output data. 3. Maximum demand table. It is an electric energy meter that not only accumulates the amount of electricity consumed by users, but also indicates the user's average maximum power within a specified time interval during an electricity bill settlement cycle. 4. Active energy meter. Used to measure active power. 5. Rate energy meter. A multi-rate electric energy meter is an electric energy meter that measures the electricity consumption in each period and the total electricity consumption in specified periods according to requirements. 6. According to the installation and wiring method of the meter, it can be divided into: Direct access type and indirect access type (access via transformer) ； Due to different measurement circuits, they are usually divided into single-phase energy meters, three-phase three-wire energy meters and three-phase four-wire energy meters.