A multi-functional operation and maintenance terminal for an electric energy meter with a wiring analysis function

Abstract

The present invention relates to a multi-functional operation and maintenance terminal for an electric energy meter with a wiring analysis function, belonging to the technical field of wiring discrimination. The terminal includes: a power supply module, an information acquisition unit, a processing unit, and a display unit; the power supply module is respectively connected to the information acquisition unit, the processing unit, and the display unit to supply power to the information acquisition unit, the processing unit, and the display unit; the input end of the processing unit is connected to the information acquisition unit; the output end of the processing unit is connected to the display unit; the information acquisition unit is used for writing electric energy meter information and meter reading; the processing unit is used for performing internal look-up table wiring discrimination based on the collected voltage, current, power factor, and phase angle of the electric energy meter; the display unit is used for displaying the wiring discrimination result. Through the terminal of the present invention, not only can various information in the electric energy meter be read, but also the on-site wiring of the electric energy meter can be discriminated based on the read voltage, current, and phase relationship, ensuring the correct wiring of the electric energy meter and the correct operation of the metering device.

Description

Technical Field

[0001] The invention belongs to the technical field of wiring discrimination, and particularly relates to a multi-functional operation and maintenance terminal for electric energy meters with a wiring analysis function. Background Art

[0002] With the development of the power industry, the electric energy meter information acquisition system is an important component of the smart grid and is deeply applied in all aspects of the power system; operation and maintenance work is one of the important tasks to ensure the reliable and efficient acquisition of electric energy meter information, and is also the basis for ensuring the correct measurement of electricity charges and the fair transaction between power supply and power consumption parties. Therefore, it is very important to design a multi-functional operation and maintenance terminal that is convenient and fast on-site.

[0003] In the prior art research on electric energy meter operation and maintenance terminals, there is no direct involvement in the intuitive on-site wiring analysis of electric energy meters. An efficient wiring discrimination method is convenient for the development of electric energy meter operation and maintenance work, ensuring the correct wiring of electric energy meters and the accuracy of metering work. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies of the prior art and provide a multi-functional operation and maintenance terminal for electric energy meters with a wiring analysis function. Through this terminal, not only can various information in the electric energy meter be read, but also the on-site wiring of the electric energy meter can be analyzed.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A multi-functional operation and maintenance terminal for electric energy meters with a wiring analysis function, comprising: a power supply module, an information acquisition unit, a processing unit, and a display unit;

[0007] The power supply module is respectively connected to the information acquisition unit, the processing unit, and the display unit to supply power to the information acquisition unit, the processing unit, and the display unit;

[0008] The input end of the processing unit is connected to the information acquisition unit; the output end of the processing unit is connected to the display unit;

[0009] The information acquisition unit is used for writing and reading the electric energy meter information, and the acquired electric energy meter information includes voltage, current amplitude and phase angle, and power factor;

[0010] The processing unit is used for internal look-up table wiring discrimination according to the acquired electric energy meter voltage, current, power factor, and phase angle;

[0011] The display unit is used for displaying the wiring discrimination result.

[0012] Further, preferably, the power supply module includes a lithium battery and an external power supply circuit.

[0013] Further, preferably, the information acquisition unit includes an infrared module and an RS485 module.

[0014] Further, preferably, the display unit is also used to read and display the internal information of the electricity meter.

[0015] Further, preferably, the processing unit performs internal look-up table analysis and discrimination based on the collected information such as the voltage, current, power factor, and phase angle of the electricity meter. On the premise that the voltage connection is correct, the relationship between the voltage and current of each phase is analyzed. Combining Figure 3 the correct power factor angle between voltage and current for different load types with the theoretical basis analysis for the corresponding load type.

[0016] Further, preferably, based on the preferred Figure 3 corresponding theoretical basis, the specific method for the terminal to analyze three-phase four-wire is as follows:

[0017] Step 1-1: Read the information of the electricity meter. The voltage of phase A is Ua, the current of phase A is Ia, the phase angle of phase A is the included angle between Ua and Ia, and the power factor is the cosine of the included angle between Ua and Ia; the voltage of phase B is Ub, the current of phase B is Ib, the phase angle of phase B is the included angle between Ub and Ib, and the power factor is the cosine of the included angle between Ub and Ib; the voltage of phase C is Uc, the current of phase C is Ic, the phase angle of phase C is the included angle between Uc and Ic, and the power factor is the cosine of the included angle between Uc and Ic;

[0018] Step 1-2: Select different load types. There are four types of load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive, and <0.5 capacitive;

[0019] Step 1-3: Set the conditions: Define phase A as the present phase, then phase C is the previous phase and phase B is the next phase; Define phase B as the present phase, then phase A is the previous phase and phase C is the next phase; Define phase C as the present phase, then phase B is the previous phase and phase A is the next phase; According to the measured phase angle, analyze and discriminate each phase in turn using the look-up table; The look-up table is shown in Table 1;

[0020] Table 1

[0021]

[0022]

[0023] Further, preferably, the processing unit performs internal look-up table analysis and discrimination based on the collected information such as the voltage, current, power factor, and phase angle of the electricity meter. On the premise that the voltage connection is correct, the relationship between the voltage and current of each phase is analyzed. Combining Figure 3 the correct power factor angle between voltage and current for different load types Theoretical basis analysis corresponding to the load type.

[0024] Further, preferably, based on the preferred Figure 3 corresponding theoretical basis, the specific method for the terminal to analyze three-phase three-wire is as follows:

[0025] Step 2-1: Read the information of the electricity meter. The voltage of phase A is Uab, the current of phase A is Ia, the phase angle of phase A is the included angle between Uab and Ia, and the power factor of phase A is the cosine of the included angle between Uab and Ia; the voltage of phase B is 0, the current of phase B is 0, the phase angle of phase B is 0, and the power factor of phase B is 0; the voltage of phase C is Ucb, the current of phase C is Ic, the phase angle of phase C is the included angle between Ucb and I, and the power factor of phase C is the cosine of the included angle between Ucb and Ic.

[0026] Step 2-2: Select different load types. There are four types of load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive, and <0.5 capacitive.

[0027] Step 2-3: According to the measured phase angle of phase A, use the look-up table shown in Table 2 to analyze and discriminate each phase.

[0028] Table 2

[0029]

[0030]

[0031] Step 2-4: According to the measured phase angle of phase C, use the look-up table shown in Table 3 to analyze and discriminate each phase.

[0032] Table 3

[0033]

[0034]

[0035] The present invention provides an electricity meter multi-functional operation and maintenance terminal with a wiring analysis function, which reads electricity meter data by using an infrared module and an RS485 module to realize wiring discrimination. The terminal includes a power supply module, a processing unit, an information acquisition unit, and a display unit. The information acquisition unit includes different communication interfaces corresponding to RS485 and infrared, reads the electricity meter data in different ways, and sends it to the processing unit; the processing unit performs internal look-up table analysis and discrimination according to the read electricity meter voltage, current, power factor, and phase angle information; the wiring discrimination result is intuitively displayed on the display unit, and at the same time, the internal information of the electricity meter can be read and displayed.

[0036] Through the terminal of the present invention, not only can various information in the electricity meter be read, but also the on-site wiring of the electricity meter can be analyzed based on the read voltage, current and phase relationship, ensuring the correct wiring of the electricity meter and the correct operation of the metering device.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] (1) The device of the present invention has a simple structure and is convenient for on-site use; (2) The information acquisition unit of the present invention adopts two methods, infrared and RS485, to adapt to on-site use in multiple environments; (3) The present invention can read and write various information in the electricity meter; (4) The multi-functional operation and maintenance terminal of the electricity meter with a wiring analysis function designed by the present invention is based on the accurate wiring of the voltage, and directly uses the obtained power factor and phase angle for wiring discrimination analysis, with accurate results and high reliability. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of the principle of the multi-functional operation and maintenance terminal of the electricity meter with a wiring analysis function of the present invention;

[0041] Figure 2 It is a schematic diagram of the structure of the information acquisition unit of the present invention;

[0042] Figure 3 It is a schematic diagram of the basis for wiring discrimination of the present invention;

[0043] Among them, 1. Power supply module; 2. Information acquisition unit; 21. Infrared module; 22. RS485 module; 3. Processing unit; 4. Display unit; The arrow indicates the direction of data or signal. Detailed Embodiments

[0044] The following further describes the present invention in detail in conjunction with the embodiments.

[0045] Those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. For those not specified in the embodiments in terms of specific technology, connection relationship or conditions, they shall be carried out according to the technology, connection relationship, conditions described in the literature in this field or according to the product description. Those materials, instruments or equipment not specified in the manufacturer shall be conventional products that can be obtained by purchase.

[0046] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say an element is "connected" to another element, it can be directly connected to other elements, or there may also be intermediate elements. In addition, the "connection" used herein may include wireless connection. The phrase "and / or" used herein includes any unit and all combinations of one or more of the associated listed items.

[0047] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more. The orientation or positional relationship indicated by terms such as "inside", "above", "below", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as here.

[0050] As Figure 1 shown, a multi-functional operation and maintenance terminal for an electric energy meter with a wiring analysis function includes: a power supply module 1, an information acquisition unit 2, a processing unit 3, and a display unit 4;

[0051] The power supply module 1 is respectively connected to the information acquisition unit 2, the processing unit 3, and the display unit 4 to supply power to the information acquisition unit 2, the processing unit 3, and the display unit 4;

[0052] The input end of the processing unit 3 is connected to the information acquisition unit 2; the output end of the processing unit 3 is connected to the display unit 4;

[0053] The information acquisition unit 2 is used for writing electricity meter information and meter reading, and the acquired electricity meter information includes voltage, current amplitude and phase angle, and power factor;

[0054] The processing unit 3 is used for internal look-up table wiring discrimination according to the collected electricity meter voltage, current, power factor and phase angle;

[0055] The display unit 4 is used for displaying the wiring discrimination result.

[0056] The power supply module 1 includes a lithium battery and an external power supply circuit, and the lithium battery can be directly used to supply power to the terminal of the present invention, outputting a stable DC power supply; or an external power supply can be used to supply power to the terminal of the present invention, outputting a stable DC power supply.

[0057] As Figure 2 shown, the information acquisition unit 2 includes an infrared module 21 and an RS485 module 22, and performs electricity energy acquisition data writing and meter reading operations.

[0058] The display unit 4 is also used for reading and displaying the internal information of the electricity meter.

[0059] The processing unit 3 analyzes the relationship between the voltage and current of each phase on the premise that the voltage wiring is correct. Combining Figure 3 the correct power factor angle between voltage and current for different load types for theoretical analysis of the corresponding load type. The terminal of the present invention can effectively analyze the wiring of three-phase four-wire and three-phase three-wire, and the following will be described in different ways.

[0060] Method 1: Carry out three-phase four-wire wiring analysis and description;

[0061] Step 1-1: Read the information of the electricity meter,

[0062] The voltage of phase A is Ua, the current of phase A is Ia, the phase angle of phase A is the included angle between Ua and Ia, and the power factor is the cosine of the included angle between Ua and Ia;

[0063] The voltage of phase B is Ub, the current of phase B is Ib, the phase angle of phase B is the included angle between Ub and Ib, and the power factor is the cosine of the included angle between Ub and Ib;

[0064] The voltage of phase C is Uc, the current of phase C is Ic, the phase angle of phase C is the included angle between Uc and Ic, and the power factor is the cosine of the included angle between Uc and Ic;

[0065] Step 1-2: Set the judgment conditions and select different load types. There are four types of the load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive, <0.5 capacitive;

[0066] Steps 1 - 3: Definition: If Phase A is defined as the main phase, then Phase C is the previous phase and Phase B is the subsequent phase; if Phase B is defined as the main phase, then Phase A is the previous phase and Phase C is the subsequent phase; if Phase C is defined as the main phase, then Phase B is the previous phase and Phase A is the subsequent phase;

[0067] According to the measured phase angles, each phase is analyzed in turn, and the lookup table is shown in Table 4;

[0068] Table 4 Wiring Discrimination Analysis Table According to the Phase Angle of Each Phase under Different Load Types

[0069]

[0070]

[0071] Note: The judgment range from the lower limit angle to the upper limit angle of the phase angle of the present invention belongs to [0°, 360°]. The lower limit angle is defined as an open interval, and the upper limit angle is defined as a closed interval. For example, in the said invention, when it is ≥0.5 inductive, the upper limit angle is 0° and the lower limit angle is 60°, and the interval range is expressed as (0°, 60°], and so on.

[0072] Method 2: Carry out three - phase three - wire wiring analysis and explanation;

[0073] Step 2 - 1: Read the information of the electric energy meter,

[0074] The voltage of Phase A is Uab, the current of Phase A is Ia, the phase angle of Phase A is the included angle between Uab and Ia, and the power factor of Phase A is the cosine of the included angle between Uab and Ia;

[0075] The voltage of Phase B is 0, the current of Phase B is 0, the phase angle of Phase B is 0, and the power factor of Phase B is 0;

[0076] The voltage of Phase C is Ucb, the current of Phase C is Ic, the phase angle of Phase C is the included angle between Ucb and I, and the power factor of Phase C is the cosine of the included angle between Ucb and Ic;

[0077] Step 2 - 2: Set the judgment conditions and select different load types. There are four types of the said load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive or <0.5 capacitive;

[0078] Step 2 - 3: According to the measured Phase A angle, each phase is analyzed in turn, and the lookup table is shown in Table 5;

[0079] Table 5 Wiring Discrimination Analysis Table According to the Phase A Angle under Different Load Types

[0080]

[0081]

[0082] Note: The judgment range of the lower limit angle to the upper limit angle of the phase angle of the present invention belongs to [0°, 360°]. The lower limit angle is defined as an open interval, and the upper limit angle is defined as a closed interval. For example, when it is ≥0.5 inductive, the upper limit angle is 30° and the lower limit angle is 90°, and the interval range is expressed as (30°, 90°], and so on.

[0083] Step 2-4: Analyze each phase in turn according to the measured C-phase angle, and the lookup table is shown in Table 6;

[0084] Table 6 Wiring discrimination analysis table according to the C-phase angle under different load types

[0085]

[0086] Note: The judgment range of the lower limit angle to the upper limit angle of the phase angle of the present invention belongs to [0°, 360°]. The lower limit angle is defined as an open interval, and the upper limit angle is defined as a closed interval. For example, when it is ≥0.5 capacitive, the upper limit angle is 30° and the lower limit angle is 90°, and the interval range is expressed as (30°, 90°], and so on.

[0087] The display unit 4 visually displays the wiring discrimination result, and at the same time can read and display the internal information of the watt-hour meter.

[0088] Application example 1: Explanation of three-phase four-wire wiring experiment

[0089] After reading the information of the watt-hour meter, select the load type of ≥0.5 inductive. Set the present phase analysis according to the measured A-phase angle. The A-phase angle is 50°, the B-phase angle is 170°, and the C-phase angle is 290°. Then it is determined that the A phase is positive, the B phase is positive, and the C phase is positive;

[0090] Select the load type of <0.5 inductive. Set the present phase analysis according to the measured A-phase angle. The A-phase angle is 70°, the B-phase angle is 10°, and the C-phase angle is 310°. Then it is determined that the A phase is positive, the B phase is negative, and the C phase is positive;

[0091] Select the load type of ≥0.5 capacitive. Set the present phase analysis according to the measured A-phase angle. The A-phase angle is 150°, the B-phase angle is 270°, and the C-phase angle is 30°. Then it is determined that the A phase is negative, the B phase is negative, and the C phase is negative;

[0092] Select the load type of <0.5 capacitive. Set the present phase analysis according to the measured A-phase angle. The A-phase angle is 100°, the B-phase angle is 220°, and the C-phase angle is 340°. Then it is determined that the A phase is negative, the B phase is negative, and the C phase is negative;

[0093] Similarly, different phases can be set as the present phase for analysis in turn. The experimental results show that it can be correctly discriminated and is feasible.

[0094] Application Example 2: Explanation of Three-Phase Three-Wire Wiring Experiment

[0095] After reading the information of the watt-hour meter, if a load type of ≥0.5 inductive is selected, then based on the analysis of the measured phase A angle, the phase A angle is 60°, the phase C angle is 120°, and it is obtained that phase A is positive and phase C is negative;

[0096] If a load type of <0.5 inductive is selected, then based on the analysis of the measured phase A angle, the phase A angle is 100°, the phase C angle is 340°, and it is obtained that phase A is positive and phase C is positive;

[0097] If a load type of ≥0.5 capacitive is selected, then based on the analysis of the measured phase A angle, the phase A angle is 0°, the phase C angle is 240°, and it is obtained that phase A is positive and phase C is positive;

[0098] If a load type of <0.5 capacitive is selected, then based on the analysis of the measured phase A angle, the phase A angle is 130°, the phase C angle is 10°, and it is obtained that phase A is negative and phase C is negative;

[0099] Similarly, the analysis can be carried out successively according to the measured phase C angle, and the experimental results show that it can be correctly discriminated and is feasible.

[0100] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-functional operation and maintenance terminal for an electric energy meter with a wiring analysis function, characterized in that, Including: A power supply module (1), an information acquisition unit (2), a processing unit (3), and a display unit (4); The power supply module (1) is respectively connected to the information acquisition unit (2), the processing unit (3), and the display unit (4) to supply power to the information acquisition unit (2), the processing unit (3), and the display unit (4); The input end of the processing unit (3) is connected to the information acquisition unit (2); the output end of the processing unit (3) is connected to the display unit (4); The information acquisition unit (2) is used for writing and reading the information of the electric energy meter, and the acquired information of the electric energy meter includes voltage, current amplitude and phase angle, and power factor; The processing unit (3) is used for judging the internal wiring by looking up a table according to the collected voltage, current, power factor and phase angle of the electric energy meter; The display unit (4) is used for displaying the wiring judgment result; The specific method for the processing unit (3) to analyze the three-phase four-wire is as follows: Step 1-1: Read the information of the electric energy meter. The voltage of phase A is Ua, the current of phase A is Ia, the phase angle of phase A is the included angle between Ua and Ia, and the power factor is the cosine of the included angle between Ua and Ia; the voltage of phase B is Ub, the current of phase B is Ib, the phase angle of phase B is the included angle between Ub and Ib, and the power factor is the cosine of the included angle between Ub and Ib; the voltage of phase C is Uc, the current of phase C is Ic, the phase angle of phase C is the included angle between Uc and Ic, and the power factor is the cosine of the included angle between Uc and Ic; Step 1-2: Select different load types. There are four types of load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive, and <0.5 capacitive; Step 1-3: Set conditions: Define phase A as the present phase, then phase C is the previous phase and phase B is the subsequent phase; define phase B as the present phase, then phase A is the previous phase and phase C is the subsequent phase; Define phase C as the present phase, then phase B is the previous phase and phase A is the subsequent phase; according to the measured phase angle, analyze and judge each phase in turn using the look-up table. The specific content of the look-up table is as follows: When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 0° and the upper limit angle of 60°, the wiring judgment is that the present phase is positive; When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 180° and the upper limit angle of 240°, the wiring judgment is that the present phase is negative; When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 120° and the upper limit angle of 180°, the wiring judgment is that the subsequent phase is positive; When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 300° and the upper limit angle of 360°, the wiring judgment is that the subsequent phase is negative; When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 240° and the upper limit angle of 300°, the wiring judgment is that the previous phase is positive; When the load type is ≥0.5 inductive and the phase angle is in the range of the lower limit angle of 60° and the upper limit angle of 120°, the wiring judgment is that the previous phase is negative; When the load type is <0.5 inductive and the phase angle is in the range of the lower limit angle of 60° and the upper limit angle of 90°, the wiring judgment is that the present phase is positive; When the load type is <0.5 inductive and the phase angle is in the range of the lower limit angle of 240° and the upper limit angle of 270°, the wiring judgment is that the present phase is negative; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 180° and the upper limit angle of 210°, the wiring discrimination is positive for the rear phase; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 0° and the upper limit angle of 30°, the wiring discrimination is negative for the rear phase; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 300° and the upper limit angle of 330°, the wiring discrimination is positive for the front phase; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 120° and the upper limit angle of 150°, the wiring discrimination is positive for the front phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 300° and the upper limit angle of 360°, the wiring discrimination is positive for the same phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 120° and the upper limit angle of 180°, the wiring discrimination is negative for the same phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 60° and the upper limit angle of 120°, the wiring discrimination is positive for the rear phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 240° and the upper limit angle of 300°, the wiring discrimination is negative for the rear phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 180° and the upper limit angle of 240°, the wiring discrimination is positive for the front phase; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 0° and the upper limit angle of 60°, the wiring discrimination is positive for the front phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 270° and the upper limit angle of 300°, the wiring discrimination is positive for the same phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 90° and the upper limit angle of 120°, the wiring discrimination is negative for the same phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 30° and the upper limit angle of 60°, the wiring discrimination is positive for the rear phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 210° and the upper limit angle of 240°, the wiring discrimination is negative for the rear phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 140° and the upper limit angle of 180°, the wiring discrimination is positive for the front phase; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 330° and the upper limit angle of 360°, the wiring discrimination is positive for the front phase; The specific method for the processing unit (3) to analyze the three-phase three-wire is as follows: Step 2-1: Read the information of the watt-hour meter. The voltage of phase A is Uab, the current of phase A is Ia, the phase angle of phase A is the included angle between Uab and Ia, and the power factor of phase A is the cosine of the included angle between Uab and Ia; the voltage of phase B is 0, the current of phase B is 0, the phase angle of phase B is 0, and the power factor of phase B is 0; the voltage of phase C is Ucb, the current of phase C is Ic, the phase angle of phase C is the included angle between Ucb and I, and the power factor of phase C is the cosine of the included angle between Ucb and Ic; Step 2-2: Select different load types. There are four types of load types, namely ≥0.5 inductive, ≥0.5 capacitive, <0.5 inductive, and <0.5 capacitive; Step 2-3: According to the measured phase angle of phase A, analyze and discriminate each phase using the following look-up table; the specific content of the look-up table is as follows: When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 30° and the upper limit angle of 90°, the wiring discrimination is Ia positive; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 210° and the upper limit angle of 270°, the wiring discrimination is Ia negative; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 270° and the upper limit angle of 330°, the wiring discrimination is Ic positive; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 90° and the upper limit angle of 150°, the wiring discrimination is Ic negative; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 90° and the upper limit angle of 120°, the wiring discrimination is Ia positive; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 270° and the upper limit angle of 300°, the wiring discrimination is Ia negative; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 330° and the upper limit angle of 360°, the wiring discrimination is Ic positive; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 150° and the upper limit angle of 180°, the wiring discrimination is Ic negative; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of -30° and the upper limit angle of 30°, the wiring discrimination is Ia positive; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 150° and the upper limit angle of 210°, the wiring discrimination is Ia negative; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 210° and the upper limit angle of 270°, the wiring discrimination is Ic positive; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 30° and the upper limit angle of 90°, the wiring discrimination is Ic negative; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 300° and the upper limit angle of 330°, the wiring discrimination is Ia positive; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 120° and the upper limit angle of 150°, the wiring discrimination is Ia negative; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 180° and the upper limit angle of 210°, the wiring discrimination is Ic positive; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 0° and the upper limit angle of 30°, the wiring discrimination is Ic negative; Step 2-4: According to the measured phase angle of phase C, analyze and discriminate each phase using the following look-up table; the specific content of the look-up table is as follows: When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of -30° and the upper limit angle of 30°, the wiring discrimination is Ic positive; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 150° and the upper limit angle of 210°, the wiring discrimination is Ic reverse; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 90° and the upper limit angle of 150°, the wiring discrimination is Ia positive; When the load type is ≥0.5 inductive and the phase angle is within the range of the lower limit angle of 270° and the upper limit angle of 330°, the wiring discrimination is Ia reverse; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 30° and the upper limit angle of 60°, the wiring discrimination is Ic positive; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 210° and the upper limit angle of 240°, the wiring discrimination is Ic reverse; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 150° and the upper limit angle of 180°, the wiring discrimination is Ia positive; When the load type is <0.5 inductive and the phase angle is within the range of the lower limit angle of 330° and the upper limit angle of 360°, the wiring discrimination is Ia reverse; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 270° and the upper limit angle of 330°, the wiring discrimination is Ic positive; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 90° and the upper limit angle of 150°, the wiring discrimination is Ic reverse; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 30° and the upper limit angle of 90°, the wiring discrimination is Ia positive; When the load type is ≥0.5 capacitive and the phase angle is within the range of the lower limit angle of 210° and the upper limit angle of 270°, the wiring discrimination is Ia reverse; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 240° and the upper limit angle of 270°, the wiring discrimination is Ic positive; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 60° and the upper limit angle of 90°, the wiring discrimination is Ic reverse; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 00° and the upper limit angle of 30°, the wiring discrimination is Ia positive; When the load type is <0.5 capacitive and the phase angle is within the range of the lower limit angle of 180° and the upper limit angle of 210°, the wiring discrimination is Ia reverse.

2. The multifunctional operation and maintenance terminal of the electric energy meter with a wiring analysis function according to claim 1, characterized in that, The power supply module (1) includes a lithium battery and an external power supply circuit.

3. The multi-functional operation and maintenance terminal of an electric energy meter with a wiring analysis function according to claim 1, characterized in that, The information acquisition unit (2) includes an infrared module (21) and an RS485 module (22).

4. The multi-functional operation and maintenance terminal of an electric energy meter with a wiring analysis function according to claim 1, characterized in that The display unit (4) is also used to read and display the internal information of the watt-hour meter.

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