Definition and classification of electric energy meters

Definition and classification of electric energy meter

Definition

Electric energy meter is used to measure the amount and speed of electric energy consumption The meter, commonly known as watt-hour meter, fire meter.

Category

By use: industrial and civil meter, electronic standard meter, maximum demand meter, multi-rate meter

According to the structure and working principle: induction type (mechanical type), static type (electronic type), electromechanical integrated type (hybrid type)

According to the nature of the connected power supply: AC meter, DC meter

Accurate level: common table: 0.2S, 0.5S, 0.2, 0.5, 1.0, 2.0, etc.

Standard table: 0.01, 0.05, 0.2, 0.5, etc.

Press Installation and wiring method: direct access type, indirect access type

According to electrical equipment: single-phase, three-phase three-wire, three-phase four-wire electric energy meter

Nameplate name and model:

The first part: Category code: D: Electric energy meter

The second part: Group code:

The first letter S: three-phase three-wire T: three Phase Four Line X: Reactive Power B: Standard Z: Maximum Demand D: Single Phase

Second Letter F: Multi-rate Schedule S: Fully Electronic D: Multi-function Y: Prepaid

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Part 3: Design serial number: Arabic numerals

Part 4: Improved serial number: represented by lowercase Chinese Pinyin letters

Part 5: Derived number T: Damp heat and dry heat dual use TH: For wet heat zone G: For plateau use H: For general use F: For chemical anticorrosion; K: Switch plate type J: Pulse electric energy meter with receiver

Also marked with ① or The symbol of ②, ① represents the accuracy of the electric energy meter is 1%, or the 1-level meter; ② represents the accuracy of the electric energy meter is 2%, or the 2-level meter.

Standard code, manufacturer, trademark and serial number used by the product are also marked.

Energy measurement unit

Active energy meter kW h

Reactive energy meter kvar h

Character wheel meter window (LCD display window):

Integer and decimal places have different colors, with a decimal point in the middle; each character wheel has a multiplication factor (when there is no decimal point). The LCD of the multi-function meter has two integer and decimal places.

Accuracy class:

Relative error, with numbers in circles for calibration current and rated maximum current:

Calibration current (rated current): Indicated on the table as the base current value of the calculated load: I b

Maximum rated current: The maximum current value that the electric energy meter can work normally for a long time, the error and temperature rise fully meet the requirements: Imax Rated voltage:

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Single-phase electric energy meter marking: 220V

Three-phase meter has three marking methods:

a. Direct access three-phase three-wire: 3×380V

b. Direct access type three-phase four-wire: 3×380/220V

Electric energy meter constant: The proportional number of the relationship between the electric energy recorded by the electric energy meter and the number of revolutions of the turntable or the number of pulses: r/kWh; imp/kWh

rated frequency: 50Hz