Definition and classification of energy meters
Definition: The energy meter is an instrument used to measure the amount of energy consumed and the rate of consumption.
Classification: by application: a industrial and civil meter, b electronic standard meter, c maximum demand meter, d multiple rate meter
According to structure and working principle: a induction (mechanical), b stationary (electronic), c electromechanical integrated (hybrid)
According to the nature of the power supply: AC meter, DC meter
According to the accuracy level: common common tables: 0.2S, 0.5S, 0.2, 0.5, 1.0, 2.0, etc.
Standard table: 0.01, 0.05, 0.2, 0.5, etc.
According to the installation wiring: direct access, indirect access
According to electrical equipment: single-phase, three-phase three-wire, three-phase four-wire energy meter
Nameplate and model
Part I: Category code: D: Energy meter
Part II: Group code: First letter S: Three-phase three-wire T: Three-phase four-wire X: Reactive power B: Standard Z: Maximum demand D: Single-phase Electronic D: Multifunctional Y: Prepaid
Part III: Design Serial Number: Arabic Numerals
Part 4: Improved Serial Number: Represented in lower case Chinese Pinyin
Part 5: Derived number T: Damp heat and dry heat TH: Damp tropical G: Plateau H: General F: Chemical anti-corrosion; K: Switch board type J: Pulse energy meter with receiver
Also marked with ① or ②
① The accuracy of the representative energy meter is 1%, or a level 1 meter;
② The accuracy of the energy meter is 2%, or a level 2 meter. It is also marked with the standard code, manufacturer, trademark and factory number used by the product.
Energy measurement unit
1. Active energy meter kW · h
2. Reactive power meter kvar · h
Character wheel register window (LCD display window): the integer and decimal places have different colors and the middle decimal point; each character wheel has a multiplication factor (when no decimal point).
Accuracy level: relative error, expressed as a number placed in a circle
Calibration current and rated maximum current: Calibration current (rated current): The base current value indicated on the table as a calculated load: I b Rated maximum current: The maximum current value that the energy meter can work normally for a long time, and the error and temperature rise fully meet the requirements : Imax Rated voltage: Single-phase energy meter Note: 220V
The three-phase meter has three labeling methods: a. Direct-connected three-phase three-wire: 3 × 380V b. Direct-connected three-phase four-wire: 3 × 380 / 220V
Energy meter constant: Proportional number of the relationship between the energy recorded by the energy meter and the number of revolutions or pulses of the turntable: r / kWh; imp / kWh Rated frequency: 50Hz