The Nameplate On The Energy Meter
The nameplate should contain the following:
(1) Trademarks.
(2) Measurement permission mark (CMC).
(3) The name or symbol of the unit of measurement, such as: "kilowatt·hour" or "kWh" for active energy meter; "kvar·hour" or "kvarh" for reactive energy meter.
In the window of the word wheel counter, the integer and decimal places are distinguished by different colors, with a decimal point in the middle; if there is no decimal point, each word wheel of the window has a multiplication factor, such as ×100, ×10, ×1, etc. For the integer and decimal places of the LCD screen, there is a decimal point in the middle.
(4) The name and model of the electric energy meter.
(5) Basic current and rated maximum current. The basic current (calibration current) is the current value that determines the relevant characteristics of the electric energy meter. It is the basic working current of the electric energy meter, expressed in Ib; the rated maximum current is the maximum current value that the meter can meet the accuracy specified by its manufacturing standard. Expressed in Imax. For example, 1.5 (6) A means that the basic current value of the electric energy meter is 1.5A, and the rated maximum current is 6A. If the rated maximum current is less than 150% of the basic current, only the basic current is indicated. For a three-phase electric energy meter, the number of phases should be multiplied in front, such as 3×5 (20) A.
(6) Reference voltage. The reference voltage is the voltage value that determines the relevant characteristics of the electric energy meter, and is the working voltage of the electric energy meter, denoted by Un. For a three-phase three-wire electric energy meter, the reference voltage is expressed by multiplying the number of phases by the line voltage, such as 3×100V; for a three-phase four-wire electric energy meter, it is expressed by multiplying the number of phases by the phase voltage/line voltage, such as 3×220/380V; For single-phase electric energy meters, it is expressed by phase voltage, such as 220V.
(7) Reference frequency. The reference frequency is the frequency value that determines the relevant characteristics of the electric energy meter, that is, the power frequency, with hertz (Hz) as the unit.
(8) Electric energy meter constant. The electric energy meter constant is the constant of the relationship between the electric energy recorded by the electric energy meter and the corresponding number of revolutions or pulses. The active electric energy meter is expressed in the form of r(imp)/kwh or kwh/r(imp), and the reactive electric energy meter is expressed in the form of r( imp)/kvarh or kvarh/r (imp). The two constants have a reciprocal relationship with each other.
(9) Accuracy level. It is represented by the grade number entered in the circle, such as noodles. uniform,@. If there is no mark, the electric energy meter is regarded as level 2.
(10) Symbols for the number of phases and lines.
(11) The ability to withstand environmental conditions is divided into 4 groups: P, S, A, and B.
(12) Manufacturing standards.
