Method for identifying connection of three-phase three-wire electric energy metering device and related device

Abstract

The application provides a connection discrimination method of a three-phase three-wire electric energy metering device and a related device, and relates to the technical field of electric energy metering. The method comprises the following steps: obtaining measurement data obtained by measuring the three-phase three-wire electric energy metering device, wherein the measurement data at least comprises a first line voltage vector, a second line voltage vector, a first current vector and a second current vector; based on a preset line voltage vector angle, discriminating the connection mode of a voltage measurement device according to the first line voltage vector and the second line voltage vector, wherein the connection mode of the voltage measurement device comprises a voltage phase mark and a voltage mutual inductor polarity; and discriminating the connection mode of a current measurement device according to the first current vector and the second current vector, wherein the connection mode of the current measurement device comprises a current phase mark and a current polarity. The application can safely, comprehensively and accurately discriminate the connection mode of the three-phase three-wire electric energy metering device.

Description

Technical Field

[0001] This application relates to the field of electricity metering technology, and in particular to a wiring identification method and related device for a three-phase three-wire electricity metering device. Background Technology

[0002] Electricity metering technology is an indispensable part of the power system, widely used in grid operation, load management, electricity billing, and other fields. Three-phase three-wire electricity metering devices are mainly used for metering electricity from high-voltage, high-power loads, and their accuracy directly affects the efficiency of grid operation and the fairness of electricity billing. In practical applications, a three-phase three-wire electricity metering device includes a three-phase three-wire electricity meter, voltage transformer, current transformer, and secondary circuits. Any wiring error in any of these components will affect the accuracy of electricity metering.

[0003] In related technologies, the correctness of wiring for three-phase three-wire energy metering devices is determined by manual on-site inspection. Manual judgment requires technicians with extensive professional knowledge and experience, and necessitates the step-by-step analysis of data such as voltage, current, and phase angle. The entire process is tedious, susceptible to human error, demands high skill levels from operators, and also poses safety risks.

[0004] Therefore, there is an urgent need for an accurate, comprehensive, and safe solution to determine the correctness of the wiring of a three-phase three-wire power metering device. Summary of the Invention

[0005] This application provides a wiring identification method and related device for a three-phase three-wire energy metering device, which can achieve the effect of comprehensively and safely identifying the wiring correctness of the three-phase three-wire energy metering device.

[0006] In a first aspect, embodiments of this application provide a wiring identification method for a three-phase three-wire energy metering device. The three-phase three-wire energy metering device includes a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter. The three ports of the voltage measuring device are respectively connected to the three ports of the three-phase three-wire energy meter. The first circuit of the current measuring device is connected to a first element, and the second circuit of the current measuring device is connected to a second element. The wiring identification method includes:

[0007] The measurement data obtained by measuring the three-phase three-wire energy metering device includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first and second ports of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third and second ports of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element.

[0008] Based on the preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity.

[0009] Based on the first current vector and the second current vector, the wiring method of the current measuring device is determined. The wiring method of the current measuring device includes current phase mark and current polarity.

[0010] In one possible implementation, the measurement data further includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. Based on a preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first and second line voltage vectors, including:

[0011] If the measurement data also includes a reference voltage, the wiring method of the voltage measuring device can be determined based on the reference voltage, the angle between the line voltage vectors, the first line voltage vector, and the second line voltage vector.

[0012] Correspondingly, determining the wiring method of the current measuring device based on the first current vector and the second current vector includes: determining the wiring method of the current measuring device based on the voltage phase indicator, the first current vector, and the second current vector.

[0013] In one possible implementation, the measurement data further includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. The preset line voltage vector angles include 60°, -60°, 30°, -30°, 120°, and -120°. Based on the reference voltage, the preset line voltage vector angles, the first line voltage vector, and the second line voltage vector, the wiring method of the voltage measuring device is determined, including:

[0014] If the angle between the first line voltage vector and the second line voltage vector is any one of -60°, 30°, or 120°, the voltage phase sequence of the voltage measuring device is determined to be a positive phase sequence; if the angle between the first line voltage vector and the second line voltage vector is any one of 60°, -30°, or -120°, the voltage phase sequence of the voltage measuring device is determined to be a reverse phase sequence.

[0015] Based on the relationship between the first phase voltage vector, the second phase voltage vector, the third phase voltage vector and the reference voltage, and the voltage phase sequence, the voltage phase index of the voltage measuring device is determined;

[0016] If the angle between the first line voltage vector and the second line voltage vector is either 60° or -60°, then the polarity of the voltage transformer is determined to be positive.

[0017] If the angle between the first line voltage vector and the second line voltage vector is not equal to either 60° or -60°, or if the amplitude of the first line voltage vector or the second line voltage vector is equal to the preset first amplitude, then the polarity of the voltage transformer is determined to be reversed.

[0018] In one possible implementation, the wiring method of the current measuring device is determined based on the voltage phase indicator, the first current vector, and the second current vector, including:

[0019] Based on the angle between the first current vector and the target phase voltage vector, and the angle between the second current vector and the target phase voltage vector, the current phase index of the current measuring device is determined. The target phase voltage vector includes the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector.

[0020] Based on the voltage phase coordinate and the current phase coordinate, the polarity of the voltage vector in phase with the current phase coordinate is determined as the current polarity of the current measuring device.

[0021] In one possible implementation, the measurement data further includes a first phase voltage vector, a second phase voltage vector, and a third phase voltage vector. Based on the first current vector and the second current vector, the wiring configuration of the current measuring device is determined, including:

[0022] If the measured data does not include a reference voltage, and it is known that the voltage transformer polarity in the voltage measuring device is non-reverse polarity and the preset power factor angle is known, the voltage phase sequence of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector.

[0023] Based on the voltage phase sequence, establish a vector coordinate system, and draw the first line voltage vector, the second line voltage vector, the first current vector, the second current vector, the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector in the vector coordinate system.

[0024] Based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system, the current phase index of the current measuring device is determined.

[0025] Based on the voltage phase sequence and the angle relationship between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, the current polarity of the current measuring device is determined, and the first target current vector is either the first current vector or the second current vector.

[0026] Correspondingly, based on the preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector, including: based on the preset line voltage vector angle, the voltage phase mark of the voltage measuring device is determined according to the current phase mark and the vector angle relationship between the voltage vector and the second target current vector, the voltage vector includes the first line voltage vector and the second line voltage vector, and the second target current vector includes the first current vector and the second current vector.

[0027] In one possible implementation, determining the voltage phase sequence of the voltage measuring device based on the first line voltage vector and the second line voltage vector includes:

[0028] If the angle between the first line voltage vector and the second line voltage vector is 300°, then the voltage phase sequence is determined to be a positive phase sequence.

[0029] If the angle between the first line voltage vector and the second line voltage vector is not 300°, then the voltage phase sequence is determined to be reverse phase sequence.

[0030] In one possible implementation, determining the current phase scale of the current measuring device based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system includes:

[0031] When the angle between the first current vector and the second current vector is 120°, if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the first current vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index; if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the second current vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index.

[0032] When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the first current vector and the target phase voltage vector is greater than 30°, then the first current vector is reversed by 180° to obtain the first reversed vector. If the lead-lag relationship between the first reversed vector and the second current vector in the vector coordinate system is that the first reversed vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index.

[0033] When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the second current vector and the target phase voltage vector is greater than 30°, then the second current vector is reversed by 180° to obtain the second reversed vector. If the lead-lag relationship between the second reversed vector and the first current vector in the vector coordinate system is that the second reversed vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index. The target phase voltage vector includes the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector.

[0034] In one possible implementation, the current polarity of the current measuring device is determined based on the voltage phase sequence and the angle relationships between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, respectively, including:

[0035] If the voltage phase sequence is positive and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be positive.

[0036] If the voltage phase sequence is positive, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be negative.

[0037] If the voltage phase sequence is reversed and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be negative.

[0038] If the voltage phase sequence is reversed, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be positive.

[0039] In one possible implementation, the preset line voltage vector angle is 30°. Based on the preset line voltage vector angle, and according to the current phase index and the vector angle relationship between the voltage vector and the current vector, the voltage phase index of the voltage measuring device is determined, including:

[0040] In a vector coordinate system, a voltage vector whose angle with the current vector is less than 30° is defined as an in-phase voltage vector.

[0041] The voltage phase coordinate of the voltage measuring device is determined based on the current phase coordinate and the in-phase voltage vector.

[0042] In one possible implementation, the wiring identification method further includes:

[0043] The power angle is determined based on the line voltage vector, current vector, phase voltage vector, and power factor angle. The power angle is used to calculate the corrected power consumption value.

[0044] In one possible implementation, the wiring identification method further includes:

[0045] Based on the wiring methods of the voltage measuring device and the current measuring device, draw and display the wiring diagram and vector diagram of the three-phase three-wire energy metering device. The wiring diagram shows the wiring connection relationship between the devices in the three-phase three-wire energy metering device, and the vector diagram is used to show the relationship between the line voltage vector, the phase voltage vector, and the current vector.

[0046] Secondly, embodiments of this application provide a wiring discrimination device for a three-phase three-wire energy metering device. The three-phase three-wire energy metering device includes a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter. The three ports of the voltage measuring device are respectively connected to the three ports of the three-phase three-wire energy meter. The first circuit of the current measuring device is connected to a first element, and the second circuit of the current measuring device is connected to a second element. The wiring discrimination device includes:

[0047] The acquisition module is used to acquire measurement data obtained by measuring the three-phase three-wire energy metering device. The measurement data includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first and second ports of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third and second ports of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element.

[0048] The voltage discrimination module is used to determine the wiring method of the voltage measuring device based on the preset line voltage vector angle and the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity.

[0049] The current discrimination module is used to determine the wiring method of the current measuring device based on the first current vector and the second current vector. The wiring method of the current measuring device includes current phase mark and current polarity.

[0050] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor;

[0051] The memory stores the instructions that the computer executes;

[0052] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0053] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0054] Fifthly, embodiments of this application provide a computer program product, including a computer program, which, when executed, implements the first aspect and / or various possible implementations of the first aspect.

[0055] The wiring identification method and related apparatus for a three-phase three-wire energy metering device provided in this application obtain measurement data from the measurement of the three-phase three-wire energy metering device. Based on the first line voltage vector, the second line voltage vector, and the preset angle between the line voltage vectors in the measurement data, the wiring method of the voltage measuring device in the three-phase three-wire energy metering device is identified. Based on the first current vector and the second current vector in the measurement data, the wiring method of the current measuring device is identified. The identified wiring methods cover all combinations of wiring methods of voltage measuring devices and current measuring devices. It can replace the operation of manually checking high-voltage wiring equipment, ensuring safety and achieving the effect of comprehensively and safely identifying the wiring correctness of the three-phase three-wire energy metering device. Attached Figure Description

[0056] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0057] Figure 1 This is a schematic diagram of the structure of a three-phase three-wire power metering device provided in an embodiment of this application;

[0058] Figure 2 A schematic flowchart illustrating the wiring discrimination method provided in the embodiments of this application;

[0059] Figure 3 This is a schematic diagram of vector coordinates under positive phase sequence provided in the embodiments of this application;

[0060] Figure 4 A schematic diagram of vector coordinates in reverse order provided in the embodiments of this application;

[0061] Figure 5 Wiring schematic diagram provided for embodiments of this application Figure 1 ;

[0062] Figure 6Wiring schematic diagram provided for embodiments of this application Figure 2 ;

[0063] Figure 7 Vector diagram provided for embodiments of this application Figure 1 ;

[0064] Figure 8 Vector diagram provided for embodiments of this application Figure 2 ;

[0065] Figure 9 A schematic diagram of the wiring discrimination device for a three-phase three-wire power metering device provided in this application embodiment;

[0066] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0067] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0068] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0069] Electricity metering technology is an indispensable part of the power system, widely used in grid operation, load management, electricity billing, and other fields. Three-phase three-wire electricity metering devices are mainly used for metering electricity from high-voltage, high-power loads, and their accuracy directly affects the efficiency of grid operation and the fairness of electricity billing.

[0070] During the installation and use of three-phase three-wire energy metering devices, wiring errors can lead to metering deviations, affecting the interests of power supply companies and users. Therefore, power companies have placed high demands on the correctness of wiring verification for three-phase three-wire energy metering devices. Current verification methods mainly rely on manual inspection or software simulation-based auxiliary judgment. Manual judgment requires technicians with extensive professional knowledge and experience, and involves step-by-step analysis of data such as voltage, current, and phase angle. The entire process is cumbersome and susceptible to human error, demanding high skill levels from operators. Software simulation-based auxiliary judgment only covers basic wiring error types and cannot handle complex wiring errors under various variable conditions. A variety of wiring error types may occur in a three-phase three-wire system, such as incorrect phase sequence in the voltage loop, incorrect phase sequence in the current loop, reversed polarity of voltage transformers, and reversed polarity of current transformers, totaling up to 144 standard wiring error scenarios. Manual judgment alone is insufficient to comprehensively and efficiently address these issues. Therefore, there is an urgent need for an accurate, comprehensive, and safe solution for verifying the wiring correctness of three-phase three-wire energy metering devices.

[0071] The wiring identification method for three-phase three-wire energy metering devices provided in this application obtains measurement data such as line voltage vector, phase voltage vector, and current vector by measuring the three-phase three-wire energy metering device. Based on the measurement data, the wiring situation under different measurement data is fully analyzed. For example, based on the acquisition of voltage reference points, corresponding identification operations are performed. This wiring identification method for three-phase three-wire energy metering devices can fully cover wiring identification under various measurement and wiring conditions, and avoids the operation of manual inspection of high-voltage wiring equipment, ensuring the safety of wiring identification and achieving comprehensive and safe identification of the wiring correctness of three-phase three-wire energy metering devices.

[0072] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0073] like Figure 1 As shown, a three-phase three-wire energy metering device includes a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter. The device calculates power and energy by measuring the line voltage and current in the three-phase three-wire system. Since there is no neutral wire in a three-phase three-wire system, the energy meter must use a two-element method, estimating the system power by measuring two-phase voltages and two-phase currents. Various wiring errors can occur in three-phase three-wire energy metering devices, including reversed voltage transformer connections, incorrect current transformer polarity, and incorrect phase sequence connections. These errors can lead to energy metering errors and even affect the safe operation of the power grid.

[0074] Specifically, such as Figure 1 As shown, in a three-phase three-wire system, there are three transmission lines on the power supply side: transmission line A, transmission line B, and transmission line C. With the correct wiring, transmission line A is connected to port A of the voltage transformer in the voltage measuring device, transmission line B is connected to port B of the voltage transformer, and transmission line C is connected to port C of the voltage transformer. The voltage transformer transmits the voltage signals from ports A, B, and C to ports a, b, and c of the other port of the voltage transformer. Port a of the voltage transformer is connected to port 1 of the three-phase three-wire energy meter, port b is connected to port 2 of the three-phase three-wire energy meter, and port c is connected to port 3 of the three-phase three-wire energy meter. With this wiring method, the three-phase three-wire energy meter can measure the correct voltage value. The current measuring device consists of two current transformers. Each current transformer is connected to one component of the three-phase three-wire energy meter to form a circuit. With the correct wiring method, the three-phase three-wire energy meter can measure the correct current value. Combined with the correct voltage value, the accurate power consumption of the three-phase three-wire system can be calculated.

[0075] Figure 2 This is a schematic flowchart illustrating the wiring identification method provided in an embodiment of this application. The wiring identification method provided in this application can be applied to... Figure 1 In the three-phase three-wire system wiring measurement scenario shown, the operation is performed by a processor with processing capabilities. For example... Figure 2 As shown, the method includes:

[0076] S201. Obtain measurement data obtained from measuring the three-phase three-wire energy metering device. The measurement data includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first and second ports of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third and second ports of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element.

[0077] Specifically, the first port of the three-phase three-wire energy meter is... Figure 1 The three-phase three-wire energy meter shown has port 1 and port 2 as... Figure 1 The three-phase three-wire energy meter shown has port 2 and port 3 as its terminals. Figure 1 The three-phase three-wire energy meter shown has three ports. The first component is... Figure 1The left component of the three-phase three-wire energy meter shown is shown above, and the right component is shown below. The wiring determination method provided in this application can determine the connection relationship between the three-phase three-wire energy meter and the voltage measuring device and the current measuring device based on the first line voltage vector and the second line voltage vector measured at the ports of the three-phase three-wire energy meter, as well as the first current vector flowing through the first component and the second current vector flowing through the second component. This eliminates the need to separately measure the values ​​at each port of the current measuring device and the voltage measuring device.

[0078] S202. Based on the preset line voltage vector angle, determine the wiring method of the voltage measuring device according to the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity.

[0079] By matching the angle between the first and second line voltage vectors with the preset line voltage vector angle, the wiring information of the voltage measuring device, such as the voltage phase sequence, voltage phase mark, and transformer polarity, can be determined.

[0080] Voltage phase sequence includes forward phase sequence and reverse phase sequence, referring to the time order in which the three phase voltages reach their positive maximum values. Figure 1 In the three-phase three-wire system shown, alternating current (AC) with the same frequency and peak value, but with a phase difference of 120°, is transmitted through lines A, B, and C. In the positive phase sequence, the voltage in line A reaches its peak value first, followed by the voltage in line B, which lags behind line A by 120°, and finally the voltage in line C, which lags behind line B by 120°, reaching its peak value. In other words, during power transmission, the AC voltages in the three lines cycle through the peak values ​​in the order of A to B to C. Conversely, in the reverse phase sequence, the voltage in line A reaches its peak value first, followed by the voltage in line C, which lags behind line A by 120°, and finally the voltage in line B, which lags behind line C by 120°, reaching its peak value. Again, during power transmission, the AC voltages in the three lines cycle through the peak values ​​in the order of A to C to B.

[0081] Voltage phase marking refers to the correspondence between the three ports of a three-phase three-wire energy meter and the three ports of a voltage measuring device. Using the port sequence of the three-phase three-wire energy meter as a reference, the ports of the voltage measuring device connected to ports 1, 2, and 3 are determined respectively. For example, if port 1 of the three-phase three-wire energy meter is connected to port a of the voltage measuring device, port 2 is connected to port b of the voltage measuring device, and port 3 is connected to port c of the voltage measuring device, then the voltage phase marking is abc.

[0082] In some implementations, the voltage phase sequence is determined based on the vector angle between the first voltage line voltage vector and the second voltage line vector, and then the voltage phase marker is determined based on the voltage phase sequence.

[0083] The polarity of a voltage transformer refers to the voltage phase relationship between its primary and secondary windings and the correspondence rule between corresponding terminals. Figure 1 In the voltage measuring device shown, the "." mark in the voltage transformer indicates the same-name terminals. The same-name terminals of the primary winding and the secondary winding are opposite each other, indicating positive polarity; otherwise, they are opposite polarity.

[0084] S203. Based on the first current vector and the second current vector, determine the wiring method of the current measuring device. The wiring method of the current measuring device includes current phase mark and current polarity.

[0085] The first current vector is measured from the first element of the three-phase three-wire energy meter. The current phase index refers to the correspondence between the first or second current vector and the current vectors in the transmission lines of the three-phase three-wire system. With correct wiring, the current measuring device is connected to both the A and C lines. The first element of the three-phase three-wire energy meter is connected to the A line through the current measuring device, and the second element is connected to the C line through the same device. Incorrect wiring may result in incorrect connections between the elements in the three-phase three-wire energy meter and the transmission lines, or the polarity of the current transformer may be reversed, in which case the current polarity will be negative.

[0086] Taking into account all the wiring combinations for voltage and current measuring devices, the possible wiring methods are shown in Table 1:

[0087] Table 1. Wiring Combinations for Three-Phase Three-Wire Energy Metering Devices

[0088]

[0089] By arranging and combining the above wiring methods, 144 wiring methods can be obtained.

[0090] The wiring discrimination method provided in this application obtains measurement data from a three-phase three-wire energy metering device. Based on the first and second line voltage vectors in the measurement data and the preset angle between the line voltage vectors, the wiring method of the voltage measuring device in the three-phase three-wire energy metering device is discerned. Based on the first and second current vectors in the measurement data, the wiring method of the current measuring device is discerned. The discernible wiring methods cover all combinations of wiring methods of voltage measuring devices and current measuring devices. It can replace the operation of manually checking high-voltage wiring equipment, ensuring safety and achieving the effect of comprehensively and safely discerning the wiring correctness of the three-phase three-wire energy metering device.

[0091] In one possible implementation, the measurement data further includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. Based on a preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first and second line voltage vectors, including:

[0092] If the measurement data also includes a reference voltage, the wiring method of the voltage measuring device is determined based on the reference voltage, the angle between the line voltage vectors, the first line voltage vector, and the second line voltage vector; correspondingly, the wiring method of the current measuring device is determined based on the first current vector and the second current vector, including: determining the wiring method of the current measuring device based on the voltage phase marker, the first current vector, and the second current vector.

[0093] When measuring parameters of a three-phase three-wire system, the reference voltage point serves as a reference potential to determine the phase and direction of the voltage. It is typically chosen as the system's neutral point or the starting point of a particular phase. The voltage at the reference voltage point is the reference voltage. If the measurement data includes a reference voltage, the wiring method of the voltage measuring device must first be determined. After obtaining the voltage phase reference, the wiring method of the current-connecting device is determined based on the voltage phase reference, the first current vector, and the second current vector.

[0094] The wiring discrimination method provided in this application fully considers the known conditions in the measurement data. When there is a reference voltage, the wiring mode of the voltage measuring device is discerned based on the reference voltage, the angle between the line voltage vectors, the first line voltage vector, and the second line voltage vector. After obtaining the wiring mode of the voltage measuring device, the wiring mode of the current wiring device is further discerned, thereby achieving efficient discrimination of the wiring mode of the three-phase three-wire energy metering device.

[0095] In one possible implementation, the measurement data further includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. The preset line voltage vector angles include 60°, -60°, 30°, -30°, 120°, and -120°. Based on the reference voltage, the preset line voltage vector angles, the first line voltage vector, and the second line voltage vector, the wiring method of the voltage measuring device is determined, including:

[0096] If the angle between the first line voltage vector and the second line voltage vector is any one of -60°, 30°, or 120°, the voltage phase sequence of the voltage measuring device is determined to be a positive phase sequence; if the angle between the first line voltage vector and the second line voltage vector is any one of 60°, -30°, or -120°, the voltage phase sequence of the voltage measuring device is determined to be a reverse phase sequence.

[0097] Based on the relationship between the first phase voltage vector, the second phase voltage vector, the third phase voltage vector and the reference voltage, and the voltage phase sequence, the voltage phase index of the voltage measuring device is determined;

[0098] If the angle between the first line voltage vector and the second line voltage vector is either 60° or -60°, then the polarity of the voltage transformer is determined to be positive.

[0099] If the angle between the first line voltage vector and the second line voltage vector is not equal to either 60° or -60°, or if the amplitude of the first line voltage vector or the second line voltage vector is equal to the preset first amplitude, the polarity of the voltage transformer is determined to be reversed.

[0100] The first phase voltage vector refers to the voltage vector between port 1 of the three-phase three-wire energy meter and ground. The second phase voltage vector refers to the voltage vector between port 2 of the three-phase three-wire energy meter and ground. The third-phase voltage vector refers to the voltage vector between port 3 of a three-phase three-wire energy meter and ground. .

[0101] In one example, if the vector angle between the first line voltage vector and the second line voltage vector is -60°, then the polarity of the voltage transformer is determined to be positive, and the phase sequence of the voltage measuring device is positive. Furthermore, if the reference voltage is... Then judge = - If the result is 0, it indicates that the voltage phase sequence is abc; if it is not 0, then determine... = - If the value is 0, it indicates that the voltage phase sequence is cab; if it is not 0, it indicates that the voltage phase sequence is bca.

[0102] Another example is when the reference voltage vector is In the case where the angle between the first line voltage vector and the second line voltage vector is -60°, the polarity of the voltage transformer is determined to be positive, and the phase sequence of the voltage measuring device is positive. Further, it is determined that... = - If the result is 0, it indicates that the voltage phase sequence is abc; if it is not 0, then determine... = - If the value is 0, it indicates that the voltage phase sequence is cab; if it is not 0, it indicates that the voltage phase sequence is bca.

[0103] Another example is when the reference voltage vector is In the following case, if the angle between the first line voltage vector and the second line voltage vector is 60°, then the polarity of the voltage transformer is determined to be positive, and the phase sequence of the voltage measuring device is reversed. Further, it is determined that... = - If the result is 0, it indicates that the voltage phase sequence is acb; if it is not 0, then determine... = - If the value is 0, it indicates that the voltage phase sequence is bac; if it is not 0, it indicates that the voltage phase sequence is cba.

[0104] Another example is when the reference voltage vector is In the following case, if the angle between the first line voltage vector and the second line voltage vector is 60°, then the polarity of the voltage transformer is determined to be positive, and the phase sequence of the voltage measuring device is reversed. Further, it is determined that... = - If the result is 0, it indicates that the voltage phase sequence is acb; if it is not 0, then determine... = - If the value is 0, it indicates that the voltage phase sequence is bac; if it is not 0, it indicates that the voltage phase sequence is cba.

[0105] In one implementation, since 300° and -300° are descriptions of different directions of the same angle as 60° and -60°, the wiring identification method for the voltage measuring device when the vector angle between the first line voltage vector and the second line voltage vector is -300° is the same as when the vector angle between the first line voltage vector and the second line voltage vector is 60° in the above example; the wiring identification method for the voltage measuring device when the vector angle between the first line voltage vector and the second line voltage vector is 300° is the same as when the vector angle between the first line voltage vector and the second line voltage vector is -60° in the above example.

[0106] Another example, the reference voltage vector is If the angle between the first and second line voltage vectors is 30°, the phase sequence of the voltage measuring device is determined to be positive. If the amplitude of the first line voltage vector is 173V, it can be determined that port 3 of the three-phase three-wire energy meter is connected to port b of the voltage measuring device. Combined with the positive phase sequence, the voltage phase sequence at this time can be determined to be cab. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0107] Another example, the reference voltage vector is If the angle between the first and second line voltage vectors is 30°, the phase sequence of the voltage measuring device is determined to be positive. If the amplitude of the second line voltage vector is 173V, then the 1 port of the three-phase three-wire energy meter is connected to the b port of the voltage measuring device. Combined with the positive phase sequence, the voltage phase sequence can be determined to be bca. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0108] Another example, the reference voltage vector is If the angle between the first and second line voltage vectors is 120°, the phase sequence of the voltage measuring device is determined to be positive. Subtracting the first and second line voltage vectors yields the third line voltage vector. If the amplitude of the third line voltage vector is 173V, then the 2-port of the three-phase three-wire energy meter is connected to the b-port of the voltage measuring device. Combined with the positive phase sequence, the voltage phase sequence can be determined to be abc. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0109] Another example, the reference voltage vector is If the angle between the first and second line voltage vectors is -120°, the phase sequence of the voltage measuring device is determined to be reversed. Subtracting the first and second line voltage vectors yields the third line voltage vector. If the amplitude of the third line voltage vector is 173V, then the 2-port of the three-phase three-wire energy meter is connected to the b-port of the voltage measuring device. Combined with the positive phase sequence, the voltage phase sequence can be determined to be cab. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0110] In one implementation, the third line voltage vector can be obtained by measuring the voltage vector between port 1 and port 3 of a three-phase three-wire energy metering device.

[0111] Another example is that the parameter voltage vector is If the angle between the first and second line voltage vectors is -30°, the phase sequence of the voltage measuring device is determined to be reversed. If the amplitude of the first line voltage vector is 173V, it can be determined that port 1 of the three-phase three-wire energy meter is connected to port b of the voltage measuring device. Combined with the reverse phase sequence, the voltage phase sequence can be determined to be bac. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0112] Another example is that the parameter voltage vector is If the angle between the first and second line voltage vectors is -30°, the phase sequence of the voltage measuring device is determined to be reversed. If the amplitude of the second line voltage vector is 173V, then the 3-port of the three-phase three-wire energy meter is connected to the 2-port (b) of the voltage measuring device. Combined with the reverse phase sequence, the voltage phase sequence can be determined to be acb. Further, the determination... = - If the value is 0, it can be determined that the polarity of the first transformer in the voltage transformer is reversed; if it is not 0, it can be determined that... = - If the value is 0, then it can be determined that the polarity of the second transformer in the voltage transformer is reversed.

[0113] The wiring discrimination method provided in this application embodiment provides the correspondence between the measurement data and the wiring method between the three-phase three-wire energy meter and the voltage measuring device when there is a voltage reference point. It can cover 18 wiring methods of voltage measuring devices and achieve the effect of comprehensively discriminating the wiring method of the voltage measuring device in the three-phase three-wire energy metering device.

[0114] In one possible implementation, the wiring method of the current measuring device is determined based on the voltage phase indicator, the first current vector, and the second current vector, including:

[0115] The current phase index of the current measuring device is determined based on the angle between the first current vector and the target phase voltage vector, and the angle between the second current vector and the target phase voltage vector. The target phase voltage vector includes the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector.

[0116] Based on the voltage phase coordinate and the current phase coordinate, the polarity of the voltage vector in phase with the current phase coordinate is determined as the current polarity of the current measuring device.

[0117] It should be noted that the default conditions of the three-phase three-wire power metering device in this application embodiment are no phase b current Ib and the power factor angle φ∈(-30°,+30°).

[0118] In one implementation, the current phase coordinate of the current measuring device can be determined by establishing a vector coordinate system based on the vector angle between the first line voltage vector and the first current vector, and the vector angle between the second line voltage vector and the second current vector.

[0119] Specifically, firstly, a vector coordinate system is established with the direction of the first phase voltage vector as 0°, and the absolute positions of the first and second line voltage vectors are determined in the vector coordinate system. Then, according to the angles of the first and second current vectors in the measured data, the first and second current vectors are drawn clockwise from the first line voltage vector in the vector coordinate system. Next, the second and third phase voltage vectors are drawn in the vector coordinate system. The phase voltage vector with an angle less than 30° to the first current vector is selected as the in-phase voltage vector of the first current vector, and the phase voltage vector with an angle less than 30° to the second current vector is selected as the in-phase voltage vector of the second current vector. The phase index of the in-phase voltage vector of the first current vector is determined as the phase index of the first current vector, and the phase index of the in-phase voltage vector of the second current vector is determined as the phase index of the second current vector. Finally, the polarity of the in-phase voltage vector of the first current vector is determined as the polarity of the first current vector, and the polarity of the in-phase voltage vector of the second current vector is determined as the polarity of the second current vector.

[0120] For example, if the angle between the first current vector and the first phase voltage vector is less than 30° in the vector coordinate system, then the first phase voltage vector is determined to be the same phase voltage as the first current vector. Based on the first phase voltage vector, the phase index of the first current vector can be determined to be a. If the first phase voltage vector is positive, then the polarity of the first current vector is determined to be positive. If the first phase voltage vector is negative, then the polarity of the first current limiting vector is determined to be negative.

[0121] In another example, if the angle between the first current vector and the third phase voltage vector is less than 30° in the vector coordinate system, then the third phase voltage vector is determined to be the same phase voltage as the first current vector. Based on the third phase voltage vector, the phase index of the first current vector can be determined to be c. If the third phase voltage vector is positive, then the polarity of the first current vector is determined to be positive. If the third phase voltage vector is negative, then the polarity of the first current limiting vector is determined to be negative.

[0122] In another example, if the angle between the second current vector and the first phase voltage vector is less than 30° in the vector coordinate system, then the first phase voltage vector is determined to be the same phase voltage as the second current vector. Based on the first phase voltage vector, the phase index of the second current vector can be determined to be a. If the first phase voltage vector is positive, then the polarity of the second current vector is determined to be positive. If the first phase voltage vector is negative, then the polarity of the first current limiting vector is determined to be negative.

[0123] In another example, if the angle between the second current vector and the third phase voltage vector is less than 30° in the vector coordinate system, then the third phase voltage vector is determined to be the same phase voltage as the second current vector. Based on the third phase voltage vector, the phase index of the second current vector can be determined to be c. If the third phase voltage vector is positive, then the polarity of the second current vector is determined to be positive. If the third phase voltage vector is negative, then the polarity of the first current limiting vector is determined to be negative.

[0124] The wiring identification method for a three-phase three-wire power metering device provided in this application, after completing the wiring identification of the voltage measuring device, determines the wiring method of the current measuring device based on the voltage phase index and the angle relationship between the current vector and the line voltage vector and the phase voltage vector, thereby achieving accurate and comprehensive identification of the wiring method of the current measuring device.

[0125] In one possible implementation, the measurement data further includes a first phase voltage vector, a second phase voltage vector, and a third phase voltage vector. Based on the first current vector and the second current vector, the wiring configuration of the current measuring device is determined, including:

[0126] If the measured data does not include a reference voltage, and it is known that the voltage transformer polarity in the voltage measuring device is non-reverse polarity and the preset power factor angle is known, the voltage phase sequence of the voltage measuring device is determined based on the first line voltage vector and the second line voltage vector.

[0127] For example, if the angle between the first line voltage vector and the second line voltage vector is 300°, the voltage phase sequence is determined to be a positive phase sequence; if the angle between the first line voltage vector and the second line voltage vector is not 300°, the voltage phase sequence is determined to be a negative phase sequence.

[0128] Based on the voltage phase sequence, establish a vector coordinate system, and draw the first line voltage vector, the second line voltage vector, the first current vector, the second current vector, the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector in the vector coordinate system.

[0129] Based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system, the current phase index of the current measuring device is determined.

[0130] Based on the voltage phase sequence and the angle relationship between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, the current polarity of the current measuring device is determined, and the first target current vector is either the first current vector or the second current vector.

[0131] Correspondingly, based on the preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector, including: based on the preset line voltage vector angle, the voltage phase mark of the voltage measuring device is determined according to the current phase mark and the vector angle relationship between the voltage vector and the second target current vector, the voltage vector includes the first line voltage vector and the second line voltage vector, and the second target current vector includes the first current vector and the second current vector.

[0132] The first phase voltage vector refers to the voltage vector between port 1 of the three-phase three-wire energy meter and ground. The second phase voltage vector refers to the voltage vector between port 2 of the three-phase three-wire energy meter and ground. The third-phase voltage vector refers to the voltage vector between port 3 of a three-phase three-wire energy meter and ground. .

[0133] For cases where the measurement data does not include a reference voltage, this application provides a wiring discrimination method that first determines the wiring method of the current measuring device and then determines the wiring method of the voltage measuring device.

[0134] Specifically, after determining the positive and negative phase sequence based on the angular relationship between the first and second line voltage vectors, establishing a vector coordinate system includes: when the voltage phase sequence is positive, such as... Figure 3 As shown, the first phase voltage vector The second phase voltage vector is in the 0° direction. The third phase voltage vector is in the 120° direction. Establish a vector coordinate system in the 240° direction; when the voltage phase sequence is reversed, such as Figure 4 As shown, the first phase voltage vector The second phase voltage vector is in the 0° direction. The third phase voltage vector is in the 120° direction. Establish a vector coordinate system for the 240° direction.

[0135] Plot the first line voltage vector from the measured data in a vector coordinate system. Second line voltage vector The position is determined, and the first current vector and the second current vector are drawn clockwise from the first line voltage vector, using the first line voltage vector as the reference vector. Based on the angular relationship between the positions of each vector in the vector coordinate system, the wiring method of the current measuring device and the wiring method of the voltage measuring device are determined.

[0136] This application provides a wiring identification method in the absence of a reference voltage. First, the voltage phase sequence is determined, and then a vector coordinate diagram is established based on the voltage phase sequence. Based on the positional relationship of each measurement data in the vector coordinate diagram, the wiring method of the current measuring device is determined first, and then the wiring method of the voltage measuring device is determined. This method can comprehensively and accurately identify the wiring method of a three-phase three-wire energy metering device in the absence of a reference voltage.

[0137] In one possible implementation, determining the voltage phase sequence of the voltage measuring device based on the first line voltage vector and the second line voltage vector includes:

[0138] If the angle between the first line voltage vector and the second line voltage vector is 300°, then the voltage phase sequence is determined to be positive phase sequence; if the angle between the first line voltage vector and the second line voltage vector is not 300°, then the voltage phase sequence is determined to be reverse phase sequence.

[0139] The wiring discrimination method provided in this application first discriminates the voltage phase sequence under the condition of no reference voltage, which is beneficial for establishing a vector coordinate system based on the voltage phase sequence. In the vector coordinate system, the wiring method of the current measuring device and the wiring method of the voltage measuring device are determined according to the positional relationship of the line voltage vector, phase voltage vector and current vector.

[0140] In one possible implementation, determining the current phase scale of the current measuring device based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system includes:

[0141] When the angle between the first current vector and the second current vector is 120°, if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the first current vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index; if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the second current vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index.

[0142] When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the first current vector and the target phase voltage vector is greater than 30°, then the first current vector is reversed by 180° to obtain the first reversed vector. If the lead-lag relationship between the first reversed vector and the second current vector in the vector coordinate system is that the first reversed vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index.

[0143] When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the second current vector and the target phase voltage vector is greater than 30°, then the second current vector is reversed by 180° to obtain the second reversed vector. If the lead-lag relationship between the second reversed vector and the first current vector in the vector coordinate system is that the second reversed vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index. The target phase voltage vector includes the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector.

[0144] When the angle between the first current vector and the second current vector is 120°, if the first current vector and the second current vector have a lead-lag relationship in the vector coordinate system, then the phase index is determined according to the phase index of the leading current vector as the first phase index and the phase index of the lagging current vector as the second phase index. For example, if the first current vector leads the second current vector, then the first current vector corresponds to Ic and the second current vector corresponds to Ia; if the second current vector leads the first current vector, then the first current vector corresponds to Ia and the second current vector corresponds to Ic.

[0145] The wiring discrimination method provided in this application determines the current phase index corresponding to the first current vector and the second current vector based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system, accurately determines the wiring method of the current measuring device, and provides a basis for subsequent discrimination of the wiring method of the voltage measuring device.

[0146] In one possible implementation, the current polarity of the current measuring device is determined based on the voltage phase sequence and the angle relationships between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, respectively, including:

[0147] If the voltage phase sequence is positive and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be positive.

[0148] If the voltage phase sequence is positive, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be negative.

[0149] If the voltage phase sequence is reversed and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be negative.

[0150] If the voltage phase sequence is reversed, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be positive.

[0151] For example, if the voltage phase sequence is positive, and the angle between the first current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device corresponding to the first current vector is determined to be positive.

[0152] In another example, if the voltage phase sequence is positive, and the angle between the second current vector and any one of the first, second, and third phase voltage vectors is less than 30°, then the current polarity of the current measuring device corresponding to the second current vector is determined to be positive.

[0153] In another example, if the voltage phase sequence is positive, and the vector angles between the first current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device corresponding to the first current vector is determined to be negative.

[0154] In another example, if the voltage phase sequence is positive, and the angle between the second current vector and the first, second, and third phase voltage vectors is greater than or equal to 30°, then the current polarity of the current measuring device corresponding to the second current vector is determined to be negative.

[0155] In another example, if the voltage phase sequence is reversed, and the angle between the first current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device corresponding to the first current vector is determined to be negative.

[0156] In another example, if the voltage phase sequence is reversed, and the angle between the second current vector and any one of the first, second, and third phase voltage vectors is less than 30°, then the current polarity of the current measuring device corresponding to the second current vector is determined to be negative.

[0157] In another example, if the voltage phase sequence is reversed, and the angle between the first current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is greater than or equal to 30°, then the current polarity of the current measuring device corresponding to the first current vector is determined to be positive.

[0158] In another example, if the voltage phase sequence is reversed, and the angle between the second current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is greater than or equal to 30°, then the current polarity of the current measuring device corresponding to the second current vector is determined to be positive.

[0159] The wiring discrimination method provided in this application, under the condition of no reference voltage, determines the current polarity based on the voltage phase sequence, and comprehensively discerns the current polarity under positive and reverse phase sequences.

[0160] In one possible implementation, the preset line voltage vector angle is 30°. Based on the preset line voltage vector angle, and according to the current phase index and the vector angle relationship between the voltage vector and the current vector, the voltage phase index of the voltage measuring device is determined, including:

[0161] In a vector coordinate system, a voltage vector whose angle with the current vector is less than 30° is defined as an in-phase voltage vector.

[0162] The voltage phase coordinate of the voltage measuring device is determined based on the current phase coordinate and the in-phase voltage vector.

[0163] It should be noted that the default power factor angle φ of the three-phase three-wire power metering device in this application embodiment is (-30°, +30°). Under this condition, the following example is provided:

[0164] In one example, if the absolute value of the angle between the first current vector and the first phase voltage vector is less than 30°, then the first current vector and the first phase voltage vector are determined to be in phase, and the voltage phase index of the first phase voltage is determined according to the current phase index of the first current vector.

[0165] Another example is that when the absolute value of the angle between the first current vector and the second phase voltage vector is less than 30°, the first current vector and the second phase voltage vector are determined to be in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the first current vector.

[0166] Another example is that when the absolute value of the angle between the first current vector and the third phase voltage vector is less than 30°, it is determined that the first current vector and the third phase voltage vector are in phase, and the voltage phase index of the third phase voltage is determined according to the current phase index of the first current vector.

[0167] Another example is that when the absolute value of the angle between the second current vector and the first phase voltage vector is less than 30°, it is determined that the second current vector and the first phase voltage vector are in phase, and the voltage phase index of the first phase voltage is determined according to the current phase index of the second current vector.

[0168] Another example is that when the absolute value of the angle between the second current vector and the second phase voltage vector is less than 30°, it is determined that the second current vector and the second phase voltage vector are in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the second current vector.

[0169] Another example is that when the absolute value of the angle between the second current vector and the third phase voltage vector is less than 30°, it is determined that the second current vector and the third phase voltage vector are in phase, and the voltage phase index of the third phase voltage is determined according to the current phase index of the second current vector.

[0170] In the above example, if the current phase coordinates of the first current vector and the second current vector have been identified, the voltage phase coordinate can be identified based on the in-phase relationship between the current vector and the phase voltage vector.

[0171] If the default power factor angle of a three-phase three-wire power metering device is φ∉(-30°, +30°), then the voltage phase mark should be determined according to the following example:

[0172] In one example, if the absolute value of the angle between the first current vector and the first phase voltage vector is greater than 30°, then the first current vector and the first phase voltage vector are determined to be in phase, and the voltage phase index of the first phase voltage is determined according to the current phase index of the first current vector.

[0173] Another example is that when the absolute value of the angle between the first current vector and the second phase voltage vector is greater than 30°, it is determined that the first current vector and the second phase voltage vector are in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the first current vector.

[0174] Another example is that when the absolute value of the angle between the first current vector and the third phase voltage vector is greater than 30°, it is determined that the first current vector and the third phase voltage vector are in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the first current vector.

[0175] Another example is that when the absolute value of the angle between the second current vector and the first phase voltage vector is greater than 30°, it is determined that the second current vector and the first phase voltage vector are in phase, and the voltage phase index of the first phase voltage is determined according to the current phase index of the second current vector.

[0176] Another example is that when the absolute value of the angle between the second current vector and the second phase voltage vector is greater than 30°, it is determined that the second current vector and the second phase voltage vector are in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the second current vector.

[0177] Another example is that when the absolute value of the angle between the second current vector and the third phase voltage vector is greater than 30°, it is determined that the second current vector and the third phase voltage vector are in phase, and the voltage phase index of the second phase voltage is determined according to the current phase index of the second current vector.

[0178] In the above example, if the current phase coordinates of the first current vector and the second current vector have been identified, the voltage phase coordinate can be identified based on the in-phase relationship between the current vector and the phase voltage vector.

[0179] The wiring identification method provided in this application determines the current vector in phase with the phase voltage vector based on the vector angle relationship between the current vector and the phase voltage vector in the vector coordinate system. When the current phase mark identification has been completed, the voltage phase mark of the phase voltage in phase with it can be determined based on the current phase mark, so as to achieve a comprehensive and accurate determination of the wiring method of the voltage measuring device.

[0180] In one possible implementation, the wiring identification method further includes:

[0181] The power angle is determined based on the line voltage vector, current vector, phase voltage vector, and power factor angle. The power angle is used to calculate the corrected power consumption value.

[0182] Specifically, in the power expression, the power angle is a variable that varies with the power factor. It consists of two parts: the first part is a fixed angle formed by the element line voltage vector and the phase voltage vector that is in phase with the element current vector; the second part is the power factor angle.

[0183] Among them, reference Figure 1 In the structure of the three-phase three-wire energy metering device, the element line voltage vector refers to the voltage vector between the port of the first element and the intermediate port. For the first element in the three-phase three-wire energy meter, the element line voltage vector refers to the first line voltage vector in the above embodiment. The current vector flowing through the first element refers to the first current vector in the above embodiment. According to the wiring identification method of the voltage measuring device and the wiring identification method of the current measuring device in the above embodiment, the voltage vector and the current phase can be determined, and then the phase current vector in the same phase as the first current vector can be determined.

[0184] The power factor angle is equal to the angle between the line voltage of the component and the phase voltage of the component's current in the same phase, plus (minus) the power factor angle of that phase.

[0185] Taking the relevant measurement data of the first element of the electricity meter as an example, the calculation steps in the specific calculation are as follows: In the vector coordinate system, arrows are used to indicate the direction of angles. The total angle is the power angle of the first element. The arrow direction is from the first line voltage vector to the first current vector. The fixed angle arrow direction is from the first line voltage to the phase voltage vector in the same phase as the first current vector. The variable angle is the power factor angle arrow direction, from the first phase voltage vector to the first current vector. Then, the arrow direction from the first line voltage vector to the first current vector is used as the reference. The direction in the same direction is +, and the opposite direction is -.

[0186] Taking the relevant measurement data of the second element of the electricity meter as an example, the calculation steps in the specific calculation are as follows: In the vector coordinate system, arrows are used to indicate the direction of angles. The total angle is the power angle of the second element. The arrow direction is from the second line voltage vector to the second current vector. The fixed angle arrow direction is from the second line voltage to the phase voltage vector in the same phase as the second current vector. The variable angle is the power factor angle arrow direction, from the second phase voltage vector to the second line current vector. Then, the arrow direction from the second line voltage vector to the second current vector is used as the reference. The direction in the same direction is +, and the opposite direction is -.

[0187] After completing the wiring judgment, the correction quantity needs to be calculated. The correct quantity can be fully restored by calculating the correction quantity using the correction factor method. Calculating the correction quantity involves calculating the active and reactive power correction factors, and then calculating the active and reactive power correction quantities. Based on the given conditions and judgment results, an active power expression is derived, the active power correction factor is calculated, and the active power correction quantity is calculated.

[0188] The wiring identification method provided in this application determines the power angle of a component based on the line voltage vector, current vector, phase voltage vector, and power factor angle, which is beneficial for calculating the correct power consumption by combining the current and voltage data in the measurement data.

[0189] In one possible implementation, the wiring identification method further includes:

[0190] Based on the wiring methods of the voltage measuring device and the current measuring device, draw and display the wiring diagram and vector diagram of the three-phase three-wire energy metering device. The wiring diagram shows the wiring connection relationship between the devices in the three-phase three-wire energy metering device, and the vector diagram is used to show the relationship between the line voltage vector, the phase voltage vector, and the current vector.

[0191] Specifically, such as Figure 5As shown, the wiring diagram includes a voltage phase sequence display area, a transformer polarity display area, a current phase sequence display area, and a current polarity display area. The voltage phase sequence, transformer polarity, current phase sequence, and current polarity obtained by the wiring discrimination method in the above embodiment are marked in the corresponding areas of the wiring diagram, which can intuitively show the wiring method under the current test data.

[0192] Figure 6 As another example of a wiring diagram, in addition to the voltage phase sequence display area, transformer polarity display area, current phase sequence display area, and current polarity display area, the wiring diagram can also display the voltage reference point.

[0193] The logic visualized in the wiring diagram is as follows:

[0194] Part 1: Voltage Transformer Polarity

[0195] A diagonal cross line is preset in the polarity setting cell, with the same white color as the background. It is not displayed when there is no transformer with reverse polarity; when a transformer with reverse polarity occurs, the corresponding cell is filled with black, making the original diagonal cross line stand out. This use of contrasting background colors highlights the area where the error occurred and clearly expresses the error itself. For example... Figure 5 and Figure 6 The “Inductor Polarity Display Area” is shown.

[0196] Part Two: Voltage Phase Sequence

[0197] Using the same logic, when adjacent phases are swapped, a highlighted background color change is used to indicate the swap. This includes swapping AB and BC, as shown in the "Voltage Phase Sequence Display Area." However, when AC is swapped, it cannot be directly displayed and needs to be moved to another area. For example... Figure 6 As shown in the "Voltage Phase Sequence Display Area", it needs to be expressed using consecutive diagonal lines of two diagonal cells.

[0198] Part Three: Current Polarity

[0199] In the corresponding cell, when the judgment result contains -Ia or -Ic, the same logic method is used to highlight the current reverse polarity error.

[0200] Part Four: Current Phase Sequence

[0201] If Ic appears before Ia in the judgment result, it means that the phase sequence of the two currents has been swapped. The same logic and method are used to highlight the error. Here, it is split into multiple cells to realize the drawing of continuous diagonal double lines.

[0202] While drawing the wiring diagram, a vector diagram can be drawn to represent the relationship between the voltage and current vectors in a three-phase three-wire energy metering device. Below is an example of a method for drawing a vector diagram of voltage and current vectors within the 0-259° range, based on Excel's radar graph function:

[0203] (a) Establish the 0-259° full-circle vector plot angle positions. Enter 0-259 into cells A5-A364 in column A to establish the plotting angles from 0-359°;

[0204] (b) Establish a vector coordinate system based on the three-phase voltages. To allow for separate color settings for phases a, b, and c, a column-by-column method is used. Enter 1 in cells B5, C125, and D245 of columns B, C, and D, and enter 0 in the cells below to establish a vector coordinate system for the three phase voltages U1, U2, and U3. The angles are referenced to a clock; U1, U2, and U3 are located at 00:00, 04:00, and 08:00 respectively, with actual angles of 0°, 120°, and 240°. The colors are yellow, green, and red, respectively. The coordinate system background is black, and the line thickness is 1 point. The vector coordinate system for path 2 is drawn by controlling the positions of U2 and U3 to achieve clockwise and counterclockwise arrangement. Specifically, add a set of 1 and 0 data in cells C245, C246, and D125, D126, and set a formula to control this arrangement in these cells. Column C is U2, and column D is U3. In the positive phase sequence, C125, C126, D245, and D246 are displayed, while D125, D126 and C245, D246 are not displayed. In the reverse phase sequence, D125, D126 and C245, D246 are displayed, while C125, C126, D245, and D246 are not displayed. Therefore, you need to enter the judgment condition in cells C125 and D245. If it is a positive sequence, enter 1; otherwise, leave a blank. Enter the formula in cells C126 and D246. If C125 and D246 are not blank, enter 0; otherwise, leave the cell blank. Similarly, you need to enter the judgment condition in cells C245 and D125. If it is a reverse sequence, enter 1; otherwise, leave a blank. Enter the formula in cells C246 and D126. If C245 and D126 are not blank, enter 0; otherwise, leave the cell blank.

[0205] (c) Establish a reference vector for line voltage vectors based on the phase voltage coordinate system. To ensure that the voltage and current vectors of the energy meter can be clearly correlated with the positions of the six line voltage vectors (Uab, Uac, Ubc, Uba, Uca, and Ucb), it is necessary to draw six line voltage vectors as the basic vectors of the coordinate system under the correct wiring condition of the voltage measuring device. The length is 1.73, and the positions are at 01:00 (30°), 03:00 (90°), 05:00 (150°), 07:00 (210°), 09:00 (270°), and 11:00 (330°), respectively. The line color is light gray, and the line weight is 0.25 pt.

[0206] (d) Draw the voltage vectors U12 and U32 of the two components of the energy meter. Based on the judgment result, use the formula to display the voltage values ​​of the two components in the corresponding cells of columns F and G. Enter the formula in cell F5. If the absolute position angle value of the first component voltage is equal to the value in cell A5, display the absolute position angle value of the first component voltage. Otherwise, check if the absolute value is equal to the value in the previous cell A4. If true, output "0"; otherwise, output a blank space. The cell containing the judgment result is yellow or red, 1.5 points. The length is 1.73 when there is no reverse polarity of the voltage transformer. If the voltage transformer has reverse polarity, the length of Uac or Uca is 3.

[0207] (e) Draw the current vectors of the two components of the electricity meter. The judgment logic is consistent with the voltage vector of the electricity meter. Calculate the location based on the judgment result and the set angle. The color is yellow or red, 1.0 pound, and the length can be selected as the actual size / rated value or 0.8 times the rated value.

[0208] The drawn vector diagram is as follows Figure 7 and Figure 8 The effect is shown in the image.

[0209] The wiring identification method provided in this application provides a wiring diagram to visually display the location of wiring errors after wiring identification is completed, and a vector diagram to display the relationship between various current and voltage vectors, so that maintenance personnel can more intuitively see the wiring and operation status of the current three-phase three-wire power metering device.

[0210] Figure 9 This is a schematic diagram of the wiring discrimination device for a three-phase three-wire energy metering device provided in an embodiment of this application. The three-phase three-wire energy metering device includes a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter. The three ports of the voltage measuring device are respectively connected to the three ports of the three-phase three-wire energy meter. The first circuit of the current measuring device is connected to the first element, and the second circuit of the current measuring device is connected to the second element, as shown below. Figure 9 As shown, the wiring discrimination device 90 provided in this embodiment includes:

[0211] The acquisition module 901 is used to acquire measurement data obtained by measuring the three-phase three-wire energy metering device. The measurement data includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first and second ports of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third and second ports of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element.

[0212] The voltage discrimination module 902 is used to determine the wiring method of the voltage measuring device based on the preset line voltage vector angle and the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity.

[0213] The current discrimination module 903 is used to determine the wiring method of the current measuring device based on the first current vector and the second current vector. The wiring method of the current measuring device includes current phase mark and current polarity.

[0214] The wiring identification device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0215] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 10 As shown, the electronic device 100 provided in this embodiment includes at least one processor 1001 and a memory 1002. Optionally, the device 100 further includes a communication interface 1003. The processor 1001, memory 1002, and communication interface 1003 are connected via a communication bus 1004.

[0216] In a specific implementation, at least one processor 1001 executes computer execution instructions stored in memory 1002, causing at least one processor 1001 to perform the above-described method.

[0217] The specific implementation process of processor 1001 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0218] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0219] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0220] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0221] This application also provides a computer program product, including a computer program that, when executed, implements the above-described method.

[0222] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, implement the above-described method.

[0223] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0224] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0225] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0226] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0227] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0228] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0229] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0230] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A wiring identification method for a three-phase three-wire energy metering device, the three-phase three-wire energy metering device comprising a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter, wherein the three ports of the voltage measuring device are respectively connected to the three ports of the three-phase three-wire energy meter, the first circuit of the current measuring device is connected to a first element, and the second circuit of the current measuring device is connected to a second element, characterized in that, The wiring identification method includes: The measurement data obtained by measuring the three-phase three-wire energy metering device includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first and second ports of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third and second ports of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element. Based on the preset line voltage vector angle, the wiring method of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity. Based on the first current vector and the second current vector, the wiring method of the current measuring device is determined. The wiring method of the current measuring device includes current phase mark and current polarity.

2. The wiring identification method according to claim 1, characterized in that, The measurement data also includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. The step of determining the wiring method of the voltage measuring device based on a preset line voltage vector angle, according to the first and second line voltage vectors, includes: If the measurement data also includes a reference voltage, the wiring method of the voltage measuring device is determined based on the reference voltage, the angle between the line voltage vectors, the first line voltage vector, and the second line voltage vector. Correspondingly, determining the wiring method of the current measuring device based on the first current vector and the second current vector includes: determining the wiring method of the current measuring device based on the voltage phase indicator, the first current vector, and the second current vector.

3. The wiring identification method according to claim 2, characterized in that, The preset line voltage vector angles include 60°, -60°, 30°, -30°, 120°, and -120°. The step of determining the wiring method of the voltage measuring device based on the reference voltage, the preset line voltage vector angles, the first line voltage vector, and the second line voltage vector includes: If the angle between the first line voltage vector and the second line voltage vector is any one of -60°, 30°, or 120°, the voltage phase sequence of the voltage measuring device is determined to be a positive phase sequence; if the angle between the first line voltage vector and the second line voltage vector is any one of 60°, -30°, or -120°, the voltage phase sequence of the voltage measuring device is determined to be a negative phase sequence. The voltage phase index of the voltage measuring device is determined based on the relationship between the first phase voltage vector, the second phase voltage vector, the third phase voltage vector and the reference voltage, as well as the voltage phase sequence. If the angle between the first line voltage vector and the second line voltage vector is either 60° or -60°, then the polarity of the voltage transformer is determined to be positive. If the angle between the first line voltage vector and the second line voltage vector is not equal to either 60° or -60°, or if the amplitude of the first line voltage vector or the second line voltage vector is equal to a preset first amplitude, then the polarity of the voltage transformer is determined to be reversed.

4. The wiring identification method according to claim 2, characterized in that, The step of determining the wiring method of the current measuring device based on the voltage phase indicator, the first current vector, and the second current vector includes: The current phase index of the current measuring device is determined based on the angle between the first current vector and the target phase voltage vector, and the angle between the second current vector and the target phase voltage vector. The target phase voltage vector includes the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector. Based on the voltage phase marker and the current phase marker, the polarity of the voltage vector in phase with the current phase marker is determined as the current polarity of the current measuring device.

5. The wiring identification method according to claim 1, characterized in that, The measurement data further includes a first-phase voltage vector, a second-phase voltage vector, and a third-phase voltage vector. The step of determining the wiring configuration of the current measuring device based on the first current vector and the second current vector includes: If the measured data does not include a reference voltage, and it is known that the voltage transformer polarity in the voltage measuring device is non-reverse polarity and the preset power factor angle is known, the voltage phase sequence of the voltage measuring device is determined according to the first line voltage vector and the second line voltage vector. Based on the voltage phase sequence, a vector coordinate system is established, and the first line voltage vector, the second line voltage vector, the first current vector, the second current vector, the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are plotted in the vector coordinate system. The current phase scale of the current measuring device is determined based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system. Based on the voltage phase sequence and the angle relationship between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, the current polarity of the current measuring device is determined, and the first target current vector is either the first current vector or the second current vector. Correspondingly, the step of determining the wiring method of the voltage measuring device based on the preset line voltage vector angle and the first line voltage vector and the second line voltage vector includes: determining the voltage phase mark of the voltage measuring device based on the preset line voltage vector angle, the current phase mark, and the vector angle relationship between the voltage vector and the second target current vector, wherein the voltage vector includes the first line voltage vector and the second line voltage vector, and the second target current vector includes the first current vector and the second current vector.

6. The wiring identification method according to claim 5, characterized in that, Determining the voltage phase sequence of the voltage measuring device based on the first line voltage vector and the second line voltage vector includes: If the angle between the first line voltage vector and the second line voltage vector is 300°, then the voltage phase sequence is determined to be a positive phase sequence. If the angle between the first line voltage vector and the second line voltage vector is not 300°, then the voltage phase sequence is determined to be an inverse phase sequence.

7. The wiring identification method according to claim 5, characterized in that, The step of determining the current phase scale of the current measuring device based on the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system includes: When the angle between the first current vector and the second current vector is 120°, if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the first current vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index; if the lead-lag relationship between the first current vector and the second current vector in the vector coordinate system is that the second current vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index. When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the first current vector and the target phase voltage vector is greater than 30°, then the first current vector is reversed by 180° to obtain the first reversed vector. Based on the lead-lag relationship between the first reversed vector and the second current vector, the current phase index is determined. If the lead-lag relationship between the first reversed vector and the second current vector in the vector coordinate system is that the first reversed vector leads the second current vector, then the phase index of the first current vector is determined to be the first phase index, and the phase index of the second current vector is determined to be the second phase index. When the vector angle between the first current vector and the second current vector is 60°, if the vector angle between the second current vector and the target phase voltage vector is greater than 30°, then the second current vector is reversed by 180° to obtain a second reversed vector. Based on the lead-lag relationship between the second reversed vector and the first current vector, the current phase index is determined. If the lead-lag relationship between the second reversed vector and the first current vector in the vector coordinate system is that the second reversed vector leads the first current vector, then the phase index of the second current vector is determined to be the first phase index, and the phase index of the first current vector is determined to be the second phase index. The target phase voltage vector includes a first phase voltage vector, a second phase voltage vector, and a third phase voltage vector.

8. The wiring identification method according to claim 5, characterized in that, Determining the current polarity of the current measuring device based on the voltage phase sequence and the angle relationships between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector, respectively, includes: If the voltage phase sequence is positive, and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be positive. If the voltage phase sequence is positive, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be negative. If the voltage phase sequence is reversed, and the angle relationship reflects that the angle between the first target current vector and any one of the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector is less than 30°, then the current polarity of the current measuring device is determined to be negative. If the voltage phase sequence is reversed, and the angle relationship reflects that the vector angles between the first target current vector and the first phase voltage vector, the second phase voltage vector, and the third phase voltage vector are all greater than or equal to 30°, then the current polarity of the current measuring device is determined to be positive.

9. The wiring identification method according to claim 5, characterized in that, The preset line voltage vector angle is 30°. The determination of the voltage phase marker of the voltage measuring device based on the preset line voltage vector angle, the current phase marker, and the vector angle relationship between the voltage vector and the current vector includes: In a vector coordinate system, a voltage vector whose angle with the current vector is less than 30° is identified as an in-phase voltage vector. The voltage phase coordinate of the voltage measuring device is determined based on the current phase coordinate and the in-phase voltage vector.

10. The wiring identification method according to any one of claims 1 to 9, characterized in that, The wiring identification method also includes: The power angle is determined based on the line voltage vector, current vector, phase voltage vector, and power factor angle. This power angle is used to calculate the corrected power consumption value.

11. The wiring identification method according to any one of claims 1 to 9, characterized in that, The wiring identification method also includes: Based on the wiring method of the voltage measuring device and the wiring method of the current measuring device, draw and display the wiring diagram and vector diagram of the three-phase three-wire energy metering device. The wiring diagram shows the wiring connection relationship between the devices in the three-phase three-wire energy metering device, and the vector diagram is used to show the relationship between the line voltage vector, the phase voltage vector and the current vector.

12. A wiring discrimination device for a three-phase three-wire energy metering device, the three-phase three-wire energy metering device comprising a voltage measuring device, a current measuring device, and a three-phase three-wire energy meter, wherein the three ports of the voltage measuring device are respectively connected to the three ports of the three-phase three-wire energy meter, the first circuit of the current measuring device is connected to a first element, and the second circuit of the current measuring device is connected to a second element, characterized in that, The wiring discrimination device includes: The acquisition module is used to acquire measurement data obtained by measuring the three-phase three-wire energy metering device. The measurement data includes at least a first line voltage vector, a second line voltage vector, a first current vector, and a second current vector. The first line voltage vector is the voltage vector between the first port and the second port of the three-phase three-wire energy meter. The second line voltage vector is the voltage vector between the third port and the second port of the three-phase three-wire energy meter. The first current vector is the current vector flowing through the first element, and the second current vector is the current vector flowing through the second element. The voltage discrimination module is used to determine the wiring method of the voltage measuring device based on the preset line voltage vector angle and the first line voltage vector and the second line voltage vector. The wiring method of the voltage measuring device includes voltage phase mark and voltage transformer polarity. The current discrimination module is used to determine the wiring method of the current measuring device based on the first current vector and the second current vector. The wiring method of the current measuring device includes current phase mark and current polarity.

13. An electronic device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-11.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed, are used to implement the method as described in any one of claims 1-11.

15. A computer program product, characterized in that, Includes a computer program, which, when executed, implements the method according to any one of claims 1-11.

Images