Definition and classification of electric energy meter
Definition: The electric energy meter is an instrument used to measure the electric energy consumption and consumption speed, commonly known as the electric energy meter and the fire meter.
Classification: according to usage: a industrial and civil table, b electronic standard table, c maximum demand table, d complex rate table
According to the structure and working principle: a induction type (mechanical type), b static type (electronic type), c electromechanical integrated type (hybrid type)
According to the nature of the connected power supply: AC meter, DC meter
Accuracy level: Commonly used 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 method: direct access type, indirect access type
Press power equipment: single-phase, three-phase three-wire, three-phase four-wire energy meters
Nameplate name and model
Part One: Category Code: D: Electric Energy Meter
Part II: Group code: First letter S: Three-phase three-wire T: Three-phase four-wire X: Reactive B: Standard Z: Maximum demand D: Single-phase second letter F: Complex rate table S: Full Electronic D: Multifunctional Y: Prepaid
Part III: Design serial number: Arabic numerals
Part 4: Improved serial number: expressed in lowercase Chinese Pinyin letters
Part V: Derived number T: both wet and dry heat TH: wet and tropical use G: plateau use H: general use F: chemical anti-corrosion use; K: switch board type J: pulse energy meter with receiver
Also marked with ① or ②
① The accuracy of the energy meter is 1%, or level 1 meter;
②The accuracy of the energy meter is 2%, or level 2 meter. It is also marked with the standard code, manufacturer, trademark and factory number used by the product.
Electric energy measurement unit
1. Active energy meter kW · h
2. Reactive energy meter kvar · h
Word wheel counter window (liquid crystal display window): The integer and decimal places have different colors and the middle decimal point; each word wheel has a multiplication factor (when there is no decimal point). The LCD of the multi-function meter has two integer and two decimal places.
Accuracy level: Relative error, represented by the number placed in the circle
Calibration current and rated maximum current: Calibration current (rated current): marked on the meter as the base current of the calculated load: I b Rated maximum current: the energy meter can work normally for a long time, and the error and temperature rise fully meet the required maximum current value : Imax Rated voltage: Single-phase energy meter Label: 220V
There are three notations for three-phase meters: a. Direct access three-phase three-wire: 3 × 380V b. Direct access three-phase four-wire: 3 × 380 / 220V
Watt-hour meter constant: the ratio of the relationship between the energy recorded by the watt-hour meter and the number of revolutions or pulses of the turntable: r / kWh; imp / kWh rated frequency: 50Hz