Measuring method and device of three-phase meter

Abstract

The present invention provides a metering method and device for a three-phase meter, comprising: obtaining a first voltage signal and a second voltage signal of the three-phase; superimposing the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal; under a preset condition, calculating a compensation value of each temperature point, and writing the compensation value of each temperature point into a register of a microcontroller unit; counting and accumulating the pulse signal to obtain an equivalent high-frequency pulse number; obtaining a first initial value, and processing the first initial value to obtain a second initial value; outputting the actual high-frequency pulse number through a pulse output management circuit according to the second initial value; calculating a pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number, thereby realizing meter calibration, and realizing the first-level error requirement of the full temperature range of ‑40° to +70°, and the error of the small current 1% IB point also meets the requirement of the first-level meter.

Description

Technical Field

[0001] The invention relates to the technical field of electrical measurement, and in particular to a metering method and a device for a three-phase meter. Background Art

[0002] At present, in the measurement process of the electric meter, the 5% IB point error meets the Level 1 requirement, there is no requirement for the 1% IB point error, and when the temperature is -40 degrees to 70 degrees, and the 1% IB point error of small current does not meet the requirements of the Level 1 meter. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a metering method and device for a three-phase meter, which can realize meter calibration and achieve the level 1 error requirement in the full temperature range of -40° to +70°, and the error of the small current 1% IB point also meets the requirements of the level 1 meter.

[0004] In a first aspect, an embodiment of the present invention provides a measurement method of a three-phase meter, the method comprising:

[0005] Acquire a first voltage signal and a second voltage signal of three phases;

[0006] Superimposing the first voltage signal and the second voltage signal of the three phases to obtain a pulse signal;

[0007] Under preset conditions, calculating the compensation value of each temperature point, and writing the compensation value of each temperature point into the register of the micro control unit;

[0008] Counting and accumulating the pulse signals to obtain an equivalent high-frequency pulse number;

[0009] Obtaining a first initial value, and processing the first initial value to obtain a second initial value;

[0010] The second initial value is outputted through the pulse output management circuit to output the actual high-frequency pulse number;

[0011] The pulse equivalent is calculated according to the equivalent high-frequency pulse number and the actual high-frequency pulse number.

[0012] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation of the first aspect, wherein, under a preset condition, calculating the compensation value of each temperature point includes repeatedly performing the following processing until all the temperature points are traversed:

[0013] Dividing the temperature into a plurality of said temperature points;

[0014] Perform multiple measurements through the simulator to measure multiple temperature values ​​of the thermistor at the current temperature point;

[0015] Averaging a plurality of the temperature values ​​to obtain an average value;

[0016] Under the preset condition, obtaining a first error value in which the compensation value is not written in the test;

[0017] The compensation value is obtained according to the first error value and the average value.

[0018] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein processing the first initial value to obtain the second initial value includes:

[0019] Writing the first initial value into the calibration table and reading the second error value;

[0020] The first initial value is corrected according to the second error value to obtain the second initial value.

[0021] In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the correcting the first initial value according to the second error value to obtain the second initial value includes:

[0022] Ba1=Ba*(1+EA)

[0023] Bb1=Bb*(1+EB)

[0024] Bc1=Bc*(1+EC)

[0025] Among them, Ba1, Bb1 and Bc1 are all the second initial values, Ba, Bb and Bc are all the first initial values, and EA, EB and EC are all the second error values.

[0026] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the calculating the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number includes:

[0027] The pulse equivalent is calculated according to the following formula:

[0028] m=Ca / Ba1+Cb / Bb1+Cc / Bc1

[0029] [Ca(Bb1*Bc1)+Cb(Ba1*Bc1)+Cc(Bb1*Ba1)] / (Ba1*Bb1*Bc1)

[0030] Among them, m is the pulse equivalent, Ca, Cb and Cc are the equivalent high-frequency pulse numbers, Ba1, Bb1 and Bc1 are the actual high-frequency pulse numbers output by the pulse output management circuit.

[0031] In combination with the first aspect, the embodiment of the present invention provides a fifth possible implementation of the first aspect, wherein the method further includes:

[0032] When the small current is in the positive direction, the metering chip in the metering unit outputs a high level and compensates the compensation value;

[0033] When the small current is in the reverse direction, the metering chip in the metering unit outputs a low level and compensates for the negative compensation value.

[0034] In a second aspect, an embodiment of the present invention also provides a metering device for a three-phase meter, the device comprising: a metering sampling circuit, a microcontroller unit, a pulse output management circuit and a temperature compensation circuit;

[0035] The metering sampling circuit, the pulse output management circuit and the temperature compensation circuit are respectively connected to the micro control unit;

[0036] The metering sampling circuit is used to perform superposition processing on the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal;

[0037] The temperature compensation circuit is used to calculate the compensation value of each temperature point under preset conditions, and write the compensation value of each temperature point into the register of the micro control unit;

[0038] The microcontroller unit is used to count and accumulate the pulse signals to obtain an equivalent high-frequency pulse number; and to obtain a first initial value, and process the first initial value to obtain a second initial value, and output the second initial value as an actual high-frequency pulse number through the pulse output management circuit; and calculate the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number.

[0039] In combination with the second aspect, an embodiment of the present invention provides a first possible implementation of the second aspect, wherein the metering sampling circuit includes a voltage sampling circuit, a current sampling circuit and a metering chip, wherein the voltage sampling circuit and the current sampling circuit are respectively connected to the metering chip;

[0040] The voltage sampling circuit is used to output the first voltage signal;

[0041] The current sampling circuit is used to output the second voltage signal;

[0042] The metering chip is used to perform superposition processing on the first voltage signal and the second voltage signal of the three phases to obtain the pulse signal.

[0043] In combination with the second aspect, an embodiment of the present invention provides a second possible implementation of the second aspect, which further includes a power management module connected to the micro control unit and configured to provide power of different levels to the metering device.

[0044] In combination with the second aspect, an embodiment of the present invention provides a third possible implementation of the second aspect, which further includes a human-computer interaction module connected to the micro control unit for displaying power data.

[0045] The embodiment of the present invention provides a metering method and device for a three-phase meter, including: obtaining a first voltage signal and a second voltage signal of the three-phase; superimposing the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal; under preset conditions, calculating the compensation value of each temperature point, and writing the compensation value of each temperature point into a register of a microcontroller unit; counting and accumulating the pulse signal to obtain an equivalent high-frequency pulse number; obtaining a first initial value, and processing the first initial value to obtain a second initial value; outputting the actual high-frequency pulse number through a pulse output management circuit according to the second initial value; calculating the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number, so as to realize meter calibration and achieve the first-level error requirement in the full temperature range of -40° to +70°, and the error of the small current 1% IB point also meets the requirements of the first-level meter.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A flow chart of a measurement method for a three-phase meter provided in Embodiment 1 of the present invention;

[0050] Figure 2 A schematic diagram of a metering device for a three-phase meter provided in Embodiment 2 of the present invention;

[0051] Figure 3A schematic diagram of the structure of a metering sampling circuit provided in Embodiment 2 of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a power management module provided in Embodiment 2 of the present invention;

[0053] Figure 5 A schematic diagram of the structure of a human-computer interaction module provided in Embodiment 2 of the present invention;

[0054] Figure 6 A schematic diagram of the storage module structure provided in Embodiment 2 of the present invention;

[0055] Figure 7 A schematic diagram of the communication module structure provided in Embodiment 2 of the present invention;

[0056] Figure 8 This is a schematic diagram of the temperature compensation circuit structure provided in Example 3 of the present invention.

[0057] icon:

[0058] 10-metering sampling circuit; 20-micro control unit; 30-pulse output management circuit; 40-temperature compensation circuit; 50-power management module; 60-human-computer interaction module; 70-storage module; 80-communication module. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0061] Embodiment 1:

[0062] Figure 1 A flow chart of a metering method for a three-phase meter provided in an embodiment of the present invention.

[0063] Reference Figure 1 , the method comprises the following steps:

[0064] Step S101, obtaining a first voltage signal and a second voltage signal of three phases;

[0065] Step S102, superimposing the first voltage signal and the second voltage signal of the three phases to obtain a pulse signal;

[0066] Step S103, under preset conditions, calculating the compensation value of each temperature point, and writing the compensation value of each temperature point into the register of the micro control unit;

[0067] Here, the preset conditions may include a variety of situations, for example, at 1% Ib (rated current) and UN (rated voltage), 2% Ib (rated current) and UN (rated voltage), 3% Ib (rated current) and UN (rated voltage), 4% Ib (rated current) and UN (rated voltage), 5% Ib (rated current) and UN (rated voltage). By calculating the compensation value of each temperature point under different conditions, the requirements of the Class 1 standard are met.

[0068] Step S104, counting and accumulating the pulse signal to obtain the equivalent high-frequency pulse number;

[0069] Step S105, obtaining a first initial value, and processing the first initial value to obtain a second initial value;

[0070] Here, the first initial values ​​are Ba, Bb and Bc. The first initial values ​​are written into the calibration table, the second error values ​​are read out, and then the first initial values ​​are corrected by the second error values ​​to obtain the second initial values ​​Ba1, Bb1 and Bc1. The second initial values ​​are written into the calibration table to calibrate the three-phase errors. In this way, the calibration table can be used. If the first initial values ​​are used directly, the accuracy is low. In order to improve the accuracy, the first initial values ​​need to be corrected.

[0071] Step S106, outputting the actual high-frequency pulse number through the pulse output management circuit using the second initial value;

[0072] Step S107, calculating the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number.

[0073] Further, step S103 includes the following steps, and the following processing is repeatedly performed until all temperature points are traversed:

[0074] Step S201, dividing the temperature into a plurality of temperature points;

[0075] Here, the temperature is divided into 110 temperature points, ranging from -40 degrees to 70 degrees, with each temperature point being one degree apart. The following steps are performed for each temperature point, and all temperature points are traversed.

[0076] Step S202, performing multiple measurements through a simulator to measure multiple temperature values ​​of the thermistor at the current temperature point;

[0077] Here, the number of measurements may be 10 times.

[0078] Step S203, averaging the multiple temperature values ​​to obtain an average value;

[0079] Step S204, under a preset condition, obtaining a first error value that is not written into the compensation value during the test;

[0080] Step S205: obtaining a compensation value according to the first error value and the average value.

[0081] Here, through the above steps, the first-level error requirement is achieved in the full temperature range of -40° to +70°, and the error meets the first-level error requirement at the small current 1% IB point; the measurement error is required to be controlled within 1% in the small current 1% Ib, 2% Ib and 5% Ib cases.

[0082] Here, the compensation value is obtained from formula (1):

[0083] Compi = the error value expected to be achieved after compensation (0.05*TEMPi*65535) / (E1*255) (1)

[0084] Wherein, Compi is the compensation value, TEMPi is the average value, and E1 is the first error value.

[0085] Further, step S105 includes the following steps:

[0086] Step S301, write the first initial value into the calibration table, and read the second error value;

[0087] Step S302, correcting the first initial value according to the second error value to obtain a second initial value.

[0088] Further, step S302 includes:

[0089] The second initial value is calculated according to formula (2):

[0090]

[0091] Among them, Ba1, Bb1 and Bc1 are all second initial values, Ba, Bb and Bc are all first initial values, and EA, EB and EC are all second error values.

[0092] Step S107 includes:

[0093] Calculate the pulse equivalent according to formula (3):

[0094]

[0095] Among them, m is the pulse equivalent, Ca, Cb and Cc are the equivalent high-frequency pulse numbers, and Ba1, Bb1 and Bc1 are the actual high-frequency pulse numbers output by the pulse output management circuit.

[0096] Specifically, the three phases include phase A, phase B and phase C. When phase A counts to Ba1Bb1*Bc1 high-frequency pulses, it actually outputs a pulse. At the same time, phase B and phase C also output a pulse when they accumulate to Ba1*Bb1*Bc1 pulses, thus realizing the accumulation function of three-phase pulses.

[0097] Furthermore, the method further comprises:

[0098] When the small current is in the positive direction, the metering chip in the metering unit outputs a high level and compensates the compensation value;

[0099] When the small current is in the reverse direction, the metering chip in the metering unit outputs a low level and compensates for the negative compensation value.

[0100] Specifically, the metering chip U2 in the metering unit outputs a reverse signal indicating REVP, and REVP is connected to the INTO pin of U3. When compensating, the two situations of small current forward and reverse need to be compensated separately.

[0101] Embodiment 2:

[0102] Figure 2 A schematic diagram of a metering device for a three-phase meter provided in Embodiment 2 of the present invention.

[0103] Reference Figure 2 , the device comprises: a metering sampling circuit 10, a micro control unit 20, a pulse output management circuit 30 and a temperature compensation circuit 40;

[0104] The metering sampling circuit 10, the pulse output management circuit 30 and the temperature compensation circuit 40 are respectively connected to the micro control unit 20;

[0105] The measuring sampling circuit 10 is used for superimposing the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal;

[0106] The temperature compensation circuit 40 is used to calculate the compensation value of each temperature point under preset conditions and write the compensation value of each temperature point into the register of the micro control unit 20;

[0107] Specifically, the structure of the temperature compensation circuit 40 can be specifically referred to Figure 8 .

[0108] The microcontroller unit 20 is used to count and accumulate the pulse signal to obtain an equivalent high-frequency pulse number; and to obtain a first initial value, and process the first initial value to obtain a second initial value, and output the second initial value as an actual high-frequency pulse number through a pulse output management circuit; and calculate the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number.

[0109] Here, the micro control unit 20 has three external pulse pins, which can receive three external pulse signals, and the three-phase pulse signals are processed by three interrupts respectively.

[0110] Furthermore, the metering sampling circuit 10 includes a voltage sampling circuit, a current sampling circuit and a metering chip, wherein the voltage sampling circuit and the current sampling circuit are respectively connected to the metering chip;

[0111] A voltage sampling circuit, used for outputting a first voltage signal;

[0112] A current sampling circuit, used for outputting a second voltage signal;

[0113] The metering chip is used for superimposing the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal.

[0114] Here, the metering sampling circuit 10 includes three metering units, each of which includes a voltage sampling circuit and a current sampling circuit. The first voltage signal output by the voltage sampling circuit and the second voltage signal output by the current sampling circuit are sent to the AD port of the metering chip. The metering chip interacts with the micro control unit 20 by outputting pulses and sends the pulse signal to the micro control unit 20.

[0115] The structure of the measurement sampling circuit 10 can be specifically referred to Figure 3 ,exist Figure 3 Among them, UN, R11, R12, R13 and R10 are voltage sampling circuits; Ia1 and Ia2 are current sampling circuits, U2 is a metering chip, and after being processed by the metering chip, a pulse signal is output to the interrupt pin of the micro control unit 20, PCF3 receives the interrupt pin of the micro control unit 20, and the micro control unit 20 accumulates the power by counting.

[0116] Furthermore, it also includes a power management module 50 connected to the micro control unit 20 and used to provide different levels of power to the metering device.

[0117] Here, the structure of the power management module 50 can be specifically referred to Figure 4 .

[0118] Furthermore, it also includes a human-computer interaction module 60 connected to the micro control unit 20 for displaying power data.

[0119] Here, the human-computer interaction module 60 can be specifically referred to Figure 5 ,exist Figure 5 In the figure, the human-machine interaction module 60 includes backlight control and LCD 1. Figure (a) is a reverse indication and pulse indication circuit, Figure (b) is a display circuit diagram of LCD 1, Figure (c) is a microcontroller unit structure diagram, and Figure (d) is a backlight control circuit diagram.

[0120] In addition, the device further includes a storage module 70 connected to the micro control unit 20. The storage module 70 is used to store and manage normal power consumption data and power-off data. Figure 6 .

[0121] The device also includes a communication module 80 connected to the micro control unit 20. The communication module 80 is used to communicate with the host computer and send normal power consumption data and power-off data to the host computer. The circuit structure of the communication module 80 can be specifically referred to Figure 7 .

[0122] An embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the three-phase meter metering method provided in the above embodiment are implemented.

[0123] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the metering method of the three-phase meter in the above embodiment are executed.

[0124] The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0125] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the above-described device and the specific working process of the device can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0126] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0127] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0128] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0129] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A three-phase meter measurement method, characterized in that: The method comprises: Acquire a first voltage signal and a second voltage signal of three phases; Superimposing the first voltage signal and the second voltage signal of the three phases to obtain a pulse signal; Under preset conditions, calculating the compensation value of each temperature point, and writing the compensation value of each temperature point into the register of the micro control unit; Counting and accumulating the pulse signals to obtain an equivalent high-frequency pulse number; Obtaining a first initial value, and processing the first initial value to obtain a second initial value; The second initial value is outputted through a pulse output management circuit to output the actual number of high-frequency pulses; Calculating a pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number; The processing of the first initial value to obtain a second initial value comprises: Writing the first initial value into the calibration table and reading the second error value; Correcting the first initial value according to the second error value to obtain the second initial value; The correcting the first initial value according to the second error value to obtain the second initial value comprises: The second initial value is calculated according to the following formula: in, , and are the second initial values, , and are the first initial values, , and are the second error values; The method further comprises: When the small current is in the positive direction, the metering chip in the metering unit outputs a high level and compensates the compensation value; When the small current is in the reverse direction, the metering chip in the metering unit outputs a low level and compensates for the negative compensation value.

2. The three-phase meter measurement method according to claim 1, characterized in that: The calculation of the compensation value of each temperature point under the preset conditions includes repeatedly performing the following processing until all the temperature points are traversed: Dividing the temperature into a plurality of said temperature points; Perform multiple measurements through the simulator to measure multiple temperature values ​​of the thermistor at the current temperature point; Averaging a plurality of the temperature values ​​to obtain an average value; Under the preset condition, obtaining a first error value in which the compensation value is not written in the test; The compensation value is obtained according to the first error value and the average value.

3. The three-phase meter measurement method according to claim 1, characterized in that: The calculating of the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number comprises: The pulse equivalent is calculated according to the following formula: Wherein, m is the pulse equivalent, , and is the equivalent high-frequency pulse number, , and Outputs the actual high-frequency pulse number to the pulse output management circuit.

4. A three-phase meter measuring device, characterized in that: The metering method applied to the three-phase meter of claim 1, the device comprising: a metering sampling circuit, a microcontroller unit, a pulse output management circuit and a temperature compensation circuit; The metering sampling circuit, the pulse output management circuit and the temperature compensation circuit are respectively connected to the micro control unit; The metering sampling circuit is used to perform superposition processing on the first voltage signal and the second voltage signal of the three-phase to obtain a pulse signal; The temperature compensation circuit is used to calculate the compensation value of each temperature point under preset conditions, and write the compensation value of each temperature point into the register of the micro control unit; The microcontroller unit is used to count and accumulate the pulse signals to obtain an equivalent high-frequency pulse number; and to obtain a first initial value, and process the first initial value to obtain a second initial value, and output the second initial value as an actual high-frequency pulse number through the pulse output management circuit; and calculate the pulse equivalent according to the equivalent high-frequency pulse number and the actual high-frequency pulse number.

5. The measuring device of the three-phase meter according to claim 4, characterized in that: The metering sampling circuit comprises a voltage sampling circuit, a current sampling circuit and a metering chip, wherein the voltage sampling circuit and the current sampling circuit are respectively connected to the metering chip; The voltage sampling circuit is used to output the first voltage signal; The current sampling circuit is used to output the second voltage signal; The metering chip is used to perform superposition processing on the first voltage signal and the second voltage signal of the three phases to obtain the pulse signal.

6. The measuring device of the three-phase meter according to claim 4, characterized in that: It also includes a power management module, which is connected to the micro control unit and is used to provide power of different levels to the metering device.

7. The measuring device of the three-phase meter according to claim 4, characterized in that: It also includes a human-computer interaction module, which is connected to the micro control unit and is used to display power data.

Images