1. Model and its meaning.
The electric meter model is represented by an arrangement of letters and numbers, and the content is as follows: Category code Group code Design serial number Derivative number.
For example, we commonly use household single-phase electricity meters: DD862-4 type, DDS97l type, DDSY97l type, etc.
1. Category code: D--electricity meter
2. Group code indicates phase line: D--single phase; S--three-phase three-wire; T-- Three-phase four-wire. Indicates the classification of use: D--multi-function; S--electronic type; X--reactive power; Y--prepaid; F--complex rate.
3. The design serial number is represented by Arabic numerals. The design serial number of each manufacturer is different. For example, the registered serial number of the electric meter product designed and produced by Changsha Himmet Electronic Technology Development Co., Ltd. is 971. Chint's is 666.
To sum up the above points:
DD--represents single-phase electricity meter: such as DD971 type DD862 type
DS--represents three-phase three-wire active electricity Electricity meter: such as DS862, DS97l type
DT--represents three-phase four-wire active energy meter: such as DT862, DT971 type
DX--represents reactive energy meter: Such as DX97l, DX864 type
DDS--indicates single-phase electronic energy meter: such as DDS97l type
D丅S--indicates three-phase four-wire electronic active energy meter : Such as DTS97l type
DDSY--Indicates single-phase electronic prepaid electricity meter: Such as DDSY97l type
DTSF--Indicates three-phase four-wire electronic multi-rate active electricity Electricity meter: such as DTSF97l type
DSSD--represents a three-phase three-wire multi-function electric meter: such as DSSD97l type
4. Basic current and rated maximum current
The basic current is the current value that determines the relevant characteristics of the meter, and the rated maximum current is the maximum current value that the meter can meet the accuracy specified in its manufacturing standards.
For example, 5(20)A means that the basic current of the watt-hour meter is 5A and the rated maximum current is 20A. For a three-phase watt-hour meter, it should be multiplied by the number of phases in front, such as 3x5(20) A.
5. Reference voltage
Refers to the voltage value that determines the relevant characteristics of the electric meter
For a three-phase three-wire electric meter, multiply the number of phases by Line voltage representation, such as 3x380V.
For a three-phase four-wire watt-hour meter, it is expressed by multiplying the number of phases by the phase voltage or line voltage, such as 3x220/380V.
For single-phase watt-hour meters, it is expressed by the voltage on the voltage line terminal, such as 220V.
2. How to read the three-phase four-wire watt-hour meter
1. If your three-phase four-wire watt-hour meter does not have a red reading box on the far right, then the black reading The boxes are all integers, but there is a scale on the right side of the "counting wheel" on the far right (that is, the single digit), and this scale is the reading after the decimal point; if it has a red reading box, then the red reading box is Decimals are displayed.
2. If your meter output does not have a current transformer, then the reading displayed on the meter is the measurement reading of your actual electricity consumption. If it is metered with a current transformer, it depends on the mutual inductance. For example, if you use a 100/5 transformer, then its magnification is 20 (that is, 100 divided by 5). If it is 200/5, the magnification is 40. If it is 500/5, the magnification That's 100. By analogy, multiply the reading displayed on the meter by this factor to get the actual amount of electricity you use, in KWh (kilowatt hour: degree). That is: actual power consumption = actual reading × magnification
3. If the transformer is wound with more than one turn, then the actual power consumption = transformer magnification / number of turns of the transformer × actual reading. The number of turns refers to the number of wires in the inner ring of the transformer, not the outer ring.
Generally, when metering and charging, decimal places are not included in most readings.
3. How much is one kilowatt hour of electricity?
Regarding the question of one kilowatt hour of electricity, for example, under the rated voltage of the electrical appliance, a 1000-watt electrical appliance consumes 1 kilowatt hour of use. degree of electricity. If 1 kilowatt hour of electricity costs 1 yuan, then a 1,000-watt electrical appliance costs 1 yuan per hour of use. For example, if the instruction manual of a rice cooker is marked with 1000W220V, then using this rice cooker at home will cost 1 coin.