Auteur : morganyhddb


Electric meters can also be called ammeters. With the development of the economy, society, and the times, the styles and functions of electric meters are increasing. Next, talk about the working principle of kilo watt-hour meter.

When the meter is connected to the circuit under test, alternating current flows through the current coil and the voltage coil. These two alternating currents respectively generate alternating magnetic fluxes in their iron cores; the alternating magnetic flux passes through The aluminum disk induces eddy currents in the aluminum disk; the eddy currents are subjected to force in the magnetic field so that the aluminum disk obtains torque (primary torque) and rotates. When the aluminum disc rotates, it is acted by the braking torque generated by the permanent magnet. The braking torque is in the opposite direction of the main torque; the magnitude of the braking torque is proportional to the rotation speed of the aluminum disc. Bigger. When the main torque and braking torque reach a temporary balance, the aluminum disk will rotate at a constant speed. The electrical energy consumed by the load is proportional to the number of revolutions of the aluminum plate. When the aluminum plate rotates, it drives the counter to indicate the power consumption.

In fact, the working principle of electricity meters is similar, and the more popular three phase electricity meter is also the


A mechanical kWh meter is an electrical meter that uses electromagnetic force to make the movable part of the measuring mechanism produce mechanical actions to reflect the measured size. The amount of electricity that a mechanical meter can accept is current, voltage, or the product of two currents. Because the nature and size of the amount of electricity that can be directly accepted by the measuring organization are limited, it is often necessary to use a measuring circuit to convert the measured value into a transitional amount that the measuring organization can accept in advance.

The type of watt-hour meter is indicated by the placement of letters and numbers, and the content is as follows: variety code + group code + program number + derivative number. Such as our commonly used household single-phase watt-hour meters: DD862-4, DDS97l, DDSY97l, etc. Generally speaking, the phase wires are divided into three types: D-single-phase; S-three-phase three-wire and T-three-phase four-wire. There are also five categories according to use: D–multi-function; S–electronic; X–reactive; Y–prepayment; F–multiple rate.

Not only mechanical watt-hour meters, single phase energy meter and other watt-hour meters work like


Zhejiang Tianpusheng Electric Co., Ltd. is one of the largest manufacturers of electric energy meters in Taizhou City, Zhejiang Province, China. One of the products we promote is single phase meter. We wish your Christmas a warm, peaceful, happy reunion with your loved ones, and wish Christmas joy and joy in the New Year.

Both single-phase electric meters and three-phase electric meters are direct input:

If both single-phase and three-phase meters are direct input, the power consumption of single-phase meters and three-phase meters is the same. Some people have to ask again, will the voltage of three-phase and single-phase meters affect the meter? This does not affect the amount of measurement. As long as the single-phase and three-phase meters are both direct input, just read the above values. The electricity consumption measurement is the same.

Mutual inductance type for single-phase and three-phase meters:

There are fewer single-phase meters connected to transformers, and three-phase meters are connected to more transformers. Pay attention to whether the three-phase meters are connected to transformers. If the three-phase meters are connected to transformers, it depends on the parameters of the transformers. The power consumption must be multiplied by the multiple of the transformer. For example, the specification of the transformer is 5/75A, indicating that the multiple of the transformer is 15.

Actual power consumption = degree * transformer multiple

Single-phase meters measure three-phase electricity:

If a single-phase electric meter measures three-phase electricity, the degree on the single-phase electric meter must be multiplied by 3. The three-phase electric meter reads the above value directly. If a transformer is installed, the parameters of the transformer must be viewed.

With the comprehensive advantages of price, quality and technology, the company’s products can be seen everywhere. If you are interested in buying our products, please click on the link to contact us: . Thinking of you and wishing you a beautiful Christmas season.


Zhejiang Tianpusheng Electric Co., Ltd. is one of the largest manufacturers of electric energy meters in Taizhou City, Zhejiang Province, China. One of the products we promote is electronic energy meter. If you are interested in us, please contact us: 。Here is a brief introduction to the advantages of electronic energy meter:

①Powerful function and easy to expand

An electronic watt-hour meter is equivalent to several induction watt-hour meters. For example, a fully functional electronic multi-function meter is equivalent to two positive active meters, two positive reactive power meters, two maximum demand meters and Only the loss-of-pressure chronograph can realize the functions of time-sharing measurement and automatic data reading that these seven watches cannot. At the same time, the reduction in the number of meters effectively reduces the pressure drop of the secondary circuit and improves the reliability and accuracy of the entire metering device.

②High accuracy and stability

The accuracy level of induction watt-hour meters is generally 0.5 to 3.0, and the error is prone to change due to mechanical wear, while electronic watt-hour meters can easily use various compensations to easily reach a higher accuracy level, and the error is stable The performance is good, and the accuracy level of the electronic energy meter is generally 0.2 to 1.0.

③The starting current is small and the error curve is flat

The induction electric energy meter can be started and measured under 0.3% Ib, and the error curve changes greatly, especially when the load is low; while the electronic electric energy meter is very sensitive and can start and perform measurement under 0.1% 1b. Metering, and the error curve is good, the error is almost a straight line in the full load range.

④Wide frequency response range

The frequency response range of the induction electric energy meter is generally 45-55 Hz, while the frequency response range of the electronic multi-function meter is 40-1000 Hz.

With the comprehensive advantages of price, quality and technology, the company’s products can be seen everywhere. If you are interested in purchasing our products, please click on the link to contact us: single phase meter manufacturer.


The three phase electricity meter needs to measure the maximum bidirectional demand, the maximum demand by time period and the date and time when it is used, and store the data with time stamp. The maximum demand value of the three-phase meter can be manually cleared. The maximum demand measurement adopts the slip method, the demand period and slip time can be set, and the larger demand data on the settlement day can be stored.

When the voltage line is powered on, time period conversion, clearing, clock adjustment, etc., the energy meter starts from the current time and performs demand measurement according to the demand cycle. When the first demand cycle is completed, it starts at the slip interval Maximum demand measurement. During an incomplete demand cycle, no record of the maximum demand is made.

The display content of the three-phase electric energy meter includes the main display data, auxiliary display code and Chinese characters. The display is divided into two modes: automatic cycle display and key display. The display items can be set as required.

The three-phase electronic charge control smart meter has an abnormal prompt function. When there is an abnormality in the operation of the electric energy meter, such as loss of voltage, severe current imbalance, phase failure, reverse phase sequence, etc., the display stays on this code and a light alarm is issued at the same time. Error codes of this digital kWh meter include the following failures: clock error, memory failure or damage.


1. The security of card data of prepaid electricity meter. Although the data of the ordinary memory card is encrypted and processed, the microcontroller in the IC card prepaid electric energy meter needs to complete a large amount of real-time work, so the data cannot be encrypted in a more complicated way. In addition, ordinary memory card electric energy meters are not easy to realize the encryption of the meter A card, but there will be leakage or decryption, and the appearance of fake cards will cause huge economic losses to the power supply department. Although the logic encryption card can realize one meter and one card, so that the system will not crash, but from the mouth of a memory oscilloscope, the key of each card can be easily obtained to achieve the purpose of stealing electricity meters. The initialization card and production card of the above two types of cards form one format, but after the disclosure or decryption, there is no need to purchase cards and electricity. These will cause huge economic losses to the power supply sector.

2. The IC card prepaid meter card meter reading microcontroller program was read, causing the encryption element to be known to hackers. Due to tight schedules or unstable production in many watch factories, card watch microcontrollers use 0TP recording. Many single-chip microcomputers can read the machine code of the solid state and its program due to the comparison during the programming process. The source program can be obtained by disassembly, and the method of stealing electricity and making fake cards can be mistaken by dividing the source program.

3. The anti-interference ability of IC card prepaid electric energy meter and card meter electronic module is poor. If the electronic module card meter has poor adaptability to voltage changes and poor interference capabilities, due to poor anti-interference capabilities such as power supply equipment, microwave ovens or heavy load switches, and no damaged electrical equipment, users will not buy card power, resulting in unconscious stealing.

4. The card meter prevents the problem from leaving traces of malicious attacks. According to speculation and introduction, malicious attackers will insert metal pieces into the booth, causing short circuits and short circuits in the booth. Some nodes use metal hooks and AC 220 volts to burn out the main IC, use DC voltage power to burn out the electronic modules, and add static high voltage.URE is a main control IC method, such as crashing a trace of the digital kWh meter to achieve the purpose of stealing.


1. din rail meter has the characteristics of wide load, high accuracy, high reliability, high sensitivity, flat error curve and low power consumption.

2. din rail meter has a two-way metering function, which can accurately measure the positive and negative two-way active energy, according to the total electricity meter, LCD display, and long-term data storage.

3. The din rail meter adopts the passive pulse output interface of optocoupler isolation.

4. The din rail meter has RS485 communication interface, and the baud rate defaults to 1200 or 2400 (when DL/T645) and 4800 (when MODBUS), which can be modified to 1200, 2400, 4800, 9600.

5. The din rail meter adopts LCD liquid crystal display, which is generous and intuitive. The instrument wheel displays data such as constant, power, meter number, voltage, current, power, etc. The power is displayed for 10 seconds, and other data is displayed for 5 seconds.

6. The din rail meter adopts the rail type installation, the size of digital kWh meter is 2P air switch size.


How to choose an electronic energy meter manufacturer with good quality and affordable price? First of all, we choose medium-sized companies. The prices of big brands are too expensive, and the quality is not much different from that of medium-sized companies. The craftsmanship and quality of small companies are too poor, so they are cheap. If you first choose a medium-sized company, how do you judge that this company is a medium-sized company?

1. Time of establishment, early establishment of time, technology has a certain accumulation foundation

2. There is an entire factory building for production and office. Some companies rent a building from others. This is not recommended.

3. Number of employees The number of employees in medium-sized companies is about 30 to 100

Secondly, it depends on whether this medium-sized enterprise has a type approval certificate. No certificate indicates that the quality and accuracy of the company’s products have yet to be verified. The accuracy of the meter is related to the interests of users and the property in the community. If the meter goes slowly, the property loss of hundreds of households is huge, and it is very possible for a family of hundreds of thousands. So it depends on whether there is a measurement certificate and test report.

Finally, let’s see if this company has established a professional after-sales service team. The after-sales service of many companies is a mess. When they need their after-sales service, no one answers the phone for a few days. If they can’t get the service in time, the owner’s meter in the community may be out of order. , There may be no electricity for a few days, which will greatly affect the lives of residents

In general, referring to the above several aspects, we can choose products with good quality and good service to a certain extent. We can use such meters with confidence, and problems will rarely occur, even if they do occur. It will be resolved soon, so as to better protect the rights and interests of the Electromechanical KWh Meter’s property and the owners.