1. Model meaning. The meter model is represented by the arrangement of letters and numbers, the content is as follows:

Category code + Group code + Design serial number + Derived number

1) Category code: D—electric meter

2) Group code: indicates phase line: D—single phase; S—three-phase three-wire active; T—three-phase four-wire active.

Indicated use: A—ampere hour meter; B—standard; D—multifunctional; F—multiple rates; H—total consumption; J—DC; L—long life; M—pulse; S—fully electronic; Y— Prepaid; X—reactive; Z—maximum demand

3) The design serial number is represented by Arabic numerals. Such as 862, 864, 238, etc.

4) The derivative number has the following representation methods: T—damp heat and dry use; TH—humid tropical use; TA—dry tropical use; G—plateau use; H—ship use; F—chemical anticorrosion use, etc. Such as:

DD—Single-phase electricity meter, such as DD862 type, DD702 type;

DS- means three-phase three-wire active power meter, such as DS864 type, DS8 type;

DT—Represents three-phase four-wire active power meter, such as DT862 type, DT864 type;

DX—Reactive power meter, such as DX963 type, DX862 type;

DJ—Indicates a DC electric meter, such as DJ1 type;

DB- means standard electric meter, such as DB2 type, DB3 type;

DBS—Indicates three-phase three-wire standard electricity meter, such as DBS25 type;

DZ—represents the maximum demand table, such as DZ1 type;

DBT—Indicates a three-phase four-wire active power meter, such as DBT25;

DSF—represents a three-phase three-wire complex rate time-sharing meter, such as DSF1;

DSSD—represents a three-phase three-wire fully electronic multi-function meter, such as the DSSD331 type;

DDY—Single-phase prepaid electricity meter, such as DDY59;

2. Nameplate sign:

1) Trademark.

2) Measurement license mark (CMC).

3) The name or symbol of the unit of measurement, such as: "kWh" or "kWh" for active energy meters; "kWh" or "kvarh" for reactive energy meters.

4) The window of the character wheel gauge, the integer and decimal places are distinguished by different colors, and there is a decimal point in the middle; if there is no decimal point, each word wheel of the window has a multiplication factor, such as × 1000, × 100, × 10, × 1.

3. The name and model of the meter

5) Basic current and rated maximum current. The basic current (also called calibration current) is the current value that determines the relevant characteristics of the meter, expressed in Ib; the rated maximum current is the maximum current value that the meter can meet the accuracy specified by its manufacturing standards, expressed in Imax.

6) Reference voltage. Refers to the voltage value that determines the relevant characteristics of the meter, expressed in UN. For three-phase three-wire meters, the number of phases is multiplied by line voltage, such as 3 × 380V; for three-phase four-wire meters, the number of phases is multiplied by phase voltage / line voltage, such as 3 × 220 / 380V; It is expressed by the voltage on the terminal of the voltage line, such as 220V.

7) Reference frequency. Refers to the frequency value that determines the relevant characteristics of the meter, expressed in Hertz (Hz).

8) Electric meter constant. Refers to the constant between the energy recorded by the meter and the corresponding number of revolutions or pulses. Active energy meters are expressed in the form of kWh / r (imp) or r (imp) / kWh; reactive energy meters are expressed in the form of kvarh / r (imp) or r (imp) / kvarh. The two constants are in reciprocal relationship with each other.

9) Accuracy level. This is indicated by the number of the grade entered in the circle.

10) Signs of phase number and line number.

11) Ability level to withstand environmental conditions, divided into P, S, A, B four groups.

12) Manufacturing standards.

13) The name or address of the manufacturer.

14) Year of manufacture.

15) If the meter has a backstop, the mark is: backstop

16) Barcode.

17) Factory number.

D- used in the front to indicate the energy meter, such as DD862; used in the back to indicate multi-function, such as DTSD238

DD-single phase, such as DD862

DT-Three-phase four-wire, such as DT862

DS-three-phase three-wire, such as DS862

F-complex rate, such as DDSF238

Y-prepaid, such as DDSY238

S-electronic, such as DDS238

What does the electric meter nameplate current 5 (10) A mean?

4. The meaning of the content of the nameplate of the meter

On the nameplate of the electric meter, we can see the following nouns: single-phase, three-phase, active, reactive, etc. The nameplate is also marked with the registered model: such as DDS ×××, the first D is the pinyin prefix of “electric meter”, the second D is the pinyin prefix of “single-phase”, and S is “static (commonly known as electronic ) "English static prefix. "×××" represents different types of electric meters produced by different enterprises. China uses a voltage system of 220V, and the frequency of alternating current is 50Hz. Special attention should be paid to the marked current value: for example, 5 (20) A means that the basic current is 5A and the maximum current is 20A. Excessive use of electricity is unsafe and a potential fire hazard.

5. The level of the meter

The nameplate is also marked with ① or ②, ① represents the accuracy of the electricity meter is 1%, or level 1 meter; ② represents the accuracy of the electricity meter is 2%, or level 2 meter. The nameplate is also marked with the standard code, manufacturer, trademark and factory number of the product. The 0.5 in the accuracy level of the meter refers to the accuracy level of the measurement winding. When the current reaches more than 10% of the rated current, it can reach the accuracy level of 0.5. S indicates a wide range, and can reach an accuracy level of 0.5 when the current reaches more than 1% of the rated current.

The level of the electricity meter is used to indicate the accuracy of the electricity meter. China stipulates that electricity meters are divided into seven levels, which are 0.1, 0.2, 0.5, 1.0, 1.5, 2.5, and 5.0. The lower the level value. The accuracy of the meter is higher. Usually the grade of the meter used is marked on the dial of the meter.

6. Why does the rating of the meter reflect the accuracy of the meter?

This is because the level of the meter is determined by the measurement error of the meter. When measuring with an electricity meter, the difference ΔX between the indicated value X of the electricity meter and the actual value X0 being measured is called the absolute error of the electricity meter measurement. The absolute error value is the ratio of the meter Xn. The value expressed as a percentage is called the reference error En of the meter, that is, En = (ΔX / Xn) × 100%

When measuring with an electric meter, the maximum quoted error Enm obtained. Remove the% sign to determine the level of the meter. If the result is between the two specified level values, then the level of the meter is set to a level of low accuracy. For example, if the maximum quoted error value measured by a certain electricity meter is 0.7%, the rating of the meter is set at 1.0, but not at 0.5.

When measuring, knowing the level of the meter used and the range of the meter, you can calculate the maximum absolute error being measured, thereby estimating the accuracy of the measurement.

The current value before the brackets is called the basic current, which is used to calculate the load base current value. The current in the brackets is called the rated maximum current.

According to the requirements of the regulations, the basic current of the direct-connected meter should be determined according to the rated maximum current and the overload multiple. Among them, the rated maximum current should be determined according to the approved customer reported load capacity; the overload multiple, for normal operation If the actual load current of the meter reaches more than 30% of the maximum rated current, it should be taken twice; if the actual load current is less than 30%, it should be taken 4 times.

What do the signs A, A1, B, B1 on the nameplate of the meter mean? When the ambient temperature changes, how does it affect the additional error?

Answer: Mark A indicates that the ambient temperature used by the meter should be 0 ～ + 40 ℃, and the relative temperature should be 95%

A1 means the ambient temperature is 0 ～ + 40 ℃, and the relative humidity is 85%

B indicates that the ambient humidity is -10 ～ 50 ℃, and the relative humidity is 95%

B1 indicates that the ambient temperature is -10 to + 50 ° C and the relative humidity is 85%.

When the ambient temperature changes, the braking flux, voltage, current working flux and phase angle ￠ of the ammeter all change, causing additional errors. For example, when the temperature rises, the braking flux decreases, the braking torque decreases accordingly, the speed of the meter increases, and the resistance of the meter turntable increases, the angle between the current working flux and the total current decreases, and the total current is excited Both the component and the corresponding magnetic flux are increased, which makes the speed of the meter faster; moreover, the magnetic resistance of this part of the magnetic flux of the voltage working flux decreases accordingly, which increases the voltage working flux and the speed of the meter becomes faster. A positive additional temperature error is generated.

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