Deviation detection method and device for single-phase electric energy meter

Abstract

The invention discloses a deviation detection method and device for a single-phase electric energy meter, and belongs to the technical field of single-phase electric energy meter error calibration, and the method comprises the steps: S1, obtaining a value of a register based on a difference value between an electric meter measurement value of a to-be-detected single-phase electric energy meter and a standard measurement value of a standard electric energy meter; s2, acquiring a first pulse constant of the to-be-detected single-phase electric energy meter by using a first electric signal input into the to-be-detected single-phase electric energy meter based on the value of the register, and acquiring a manganese-copper resistance value of a relay in the to-be-detected single-phase electric energy meter based on the first pulse constant and a second electric signal input into the to-be-detected single-phase electric energy meter; and S3, performing deviation detection based on the value of the register and the manganese-copper resistance value of the relay in the to-be-detected single-phase electric energy meter. The problem that the deviation detection precision of the single-phase electric energy meter is low due to the fact that the manganese-copper resistance value of the relay in the single-phase electric energy meter is difficult to accurately obtain is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of single-phase electric energy meter error calibration, and in particular to a single-phase electric energy meter deviation detection method and device. Background Art

[0002] With the rapid development of the power industry and the continuous improvement of user needs, the application scope of single-phase energy meters is becoming increasingly wide, so the detection and accuracy requirements of single-phase energy meters are also increasing. For example, a deviation detection circuit, a deviation self-calibration method, and a new type of intelligent energy meter with patent number CN118330545A, such as Figure 2 As shown, it includes a voltage-stabilized power supply VCC and a resistor string R5 and R6 for online calibration of the input voltage or input current of the smart electric energy meter; the first end of the resistor string R5 is connected to the voltage-stabilized power supply VCC, the second end of the resistor string R5 is connected to the first end of the resistor string R6, the second end of the resistor string R5 and the first end of the resistor string R6 are both connected to the ADC sampling channel of the single-chip microcomputer, and the deviation detection circuit is connected to the circuit of the smart electric energy meter through the ADC sampling channel of the single-chip microcomputer. According to the above circuit, when the sampling resistor drifts due to environmental changes and the accuracy of the electric energy meter changes, the electric energy meter corrects the resistance ratio and recalibrates the electric energy meter online, thereby improving the error accuracy stability. However, the above scheme is to perform deviation detection on the electric energy meter that has been put into use, and does not consider the influence of the manganese copper resistance of the electric energy meter's internal relay during the initial error calibration, and it is difficult to accurately obtain the manganese copper resistance of the electric energy meter's internal relay through the above scheme, which will lead to low deviation detection accuracy of the electric energy meter. Summary of the invention

[0003] In view of the problem in the prior art that it is difficult to accurately obtain the manganese copper resistance of the internal relay of the single-phase electric energy meter, resulting in low deviation detection accuracy of the single-phase electric energy meter. The present invention provides a deviation detection method and device for a single-phase electric energy meter, which uses the first pulse constant of the single-phase electric energy meter as a bridge, reversely deduces the manganese copper resistance of the internal relay of the single-phase electric energy meter through the value of the register, and then performs deviation detection under the joint action of the register value and the manganese copper resistance, thereby solving the problem that it is difficult to accurately obtain the manganese copper resistance of the internal relay of the single-phase electric energy meter, resulting in low deviation detection accuracy of the single-phase electric energy meter. The influence of the manganese copper resistance of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter is fully considered, and the deviation detection accuracy of the single-phase electric energy meter is significantly improved.

[0004] To solve the above technical problems, the present invention provides a deviation detection method for a single-phase electric energy meter, comprising the following steps: S1: obtaining a register value based on a difference between a meter measurement value of the single-phase electric energy meter to be detected and a standard measurement value of a standard electric energy meter; S2: Based on the value of the register, a first pulse constant of the single-phase electric energy meter to be detected is obtained using a first electrical signal input to the single-phase electric energy meter to be detected, and a manganese copper resistance value of a relay in the single-phase electric energy meter to be detected is obtained based on the first pulse constant and a second electrical signal input to the single-phase electric energy meter to be detected; S3: Perform deviation detection based on the register value and the manganese copper resistance of the relay in the single-phase electric energy meter to be detected.

[0005] After adopting the above technical solution, the present invention has the following advantages: Since the value of the register is related to the first pulse constant, and the first pulse constant is related to the manganese-copper resistance of the relay and the electrical signal input to the single-phase electric energy meter, the relationship between the value of the register and the manganese-copper resistance of the relay in the single-phase electric energy meter can be inferred through the first pulse constant, and then the manganese-copper resistance of the relay in the single-phase electric energy meter can be accurately obtained. Furthermore, deviation detection is performed under the joint action of the register value and the manganese-copper resistance, and the influence of the manganese-copper resistance of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter is fully considered, and the deviation detection accuracy of the single-phase electric energy meter is significantly improved, thereby reducing the error out-of-tolerance failure rate caused by the manganese-copper resistance problem of the internal relay during the initial error calibration of the single-phase electric energy meter, enhancing the reliability of the single-phase electric energy meter, and solving the problem of low deviation detection accuracy of the single-phase electric energy meter due to the difficulty in accurately obtaining the manganese-copper resistance of the internal relay of the single-phase electric energy meter.

[0006] Preferably, the S1 comprises: S11: Determine whether the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is greater than a preset difference, if so, report an error, if less than, obtain a calibration error value based on the difference, and continue to execute S12; S12: Determine whether the calibration error value is greater than or equal to a preset value. If the calibration error value is greater than or equal to the preset value, use the first formula to obtain the register value GP. If the calibration error value is less than the preset value, use the second formula to obtain the register value GP. By preliminarily screening out single-phase energy meters with obvious errors, detection resources are saved and detection efficiency is improved.

[0007] Preferably, in S11, if less than, obtaining a calibration error value based on the difference comprises: Calibration error value Wherein, err is the difference.

[0008] Preferably, in S12, the first formula is GP=INT[Pg*2 15 ], the second formula is GP=INT[2 16 +Pg*2 15 ].

[0009] Preferably, in S2, the expression for obtaining the first pulse constant of the single-phase electric energy meter to be detected by using the first electrical signal input to the single-phase electric energy meter to be detected based on the value of the register is: HFconst=V u *V i *(1+GQ), where HFconst is the first pulse constant of the single-phase energy meter to be tested, V u Represents the sampled voltage on the voltage channel, V i Represents the sampled voltage on the current channel, and GQ is the value of the register. By calculating the first pulse constant of the single-phase energy meter accurately, the accuracy of subsequent single-phase energy meter detection is improved, thereby improving the reliability of the single-phase energy meter.

[0010] Preferably, in S2, the expression for obtaining the manganese copper resistance of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected is: In the formula, R m E is the manganese copper resistance of the relay in the single-phase electric energy meter to be tested, u is the second pulse constant of the single-phase electric energy meter to be tested, U n is the input voltage of the single-phase energy meter to be tested, and C is a preset constant. By inferring the precise manganese copper resistance value, the performance of the internal components of the single-phase energy meter can be more accurately evaluated, and the energy meter with performance problems can be quickly screened out to avoid the measurement error caused by the single-phase energy meter with performance problems after entering the market. While significantly improving the deviation detection accuracy of the single-phase energy meter, the overall quality of the single-phase energy meter is improved.

[0011] Preferably, S3 includes: S31: Determine whether the manganese copper resistance of the relay is within a preset resistance range. If the manganese copper resistance of the relay is within the preset resistance range, execute S32. If not, it indicates that there is a deviation in the single-phase electric energy meter to be detected. S32: Determine whether the value of the register is within the preset storage range. If the value of the register is within the preset storage range, it indicates that there is no deviation in the single-phase electric energy meter to be detected. If the value of the register is not within the preset storage range, it indicates that there is a deviation in the single-phase electric energy meter to be detected. By judging whether the manganese copper resistance value is within the preset resistance value range, the electric energy meter with performance problems can be effectively screened out. By comparing whether the value of the register is within the preset storage range, the electric energy meter with performance problems can be further screened out to ensure the accuracy and reliability of the single-phase electric energy meter. Through the dual judgment of the manganese copper resistance value and the register value, the single-phase electric energy meter with performance problems can be accurately detected, thereby effectively reducing the failure rate of the single-phase electric energy meter when it is recalibrated at the factory due to insufficient measurement accuracy and excessive errors.

[0012] Beneficial effects of this program: By judging whether the difference is greater than the preset difference, single-phase energy meters with obvious errors can be preliminarily screened out, which saves detection resources and improves detection efficiency; Since the value of the register is related to the first pulse constant, and the first pulse constant is related to the manganese-copper resistance of the relay and the electrical signal input to the single-phase electric energy meter, the relationship between the value of the register and the manganese-copper resistance of the relay in the single-phase electric energy meter can be inferred through the first pulse constant, and then the manganese-copper resistance of the relay in the single-phase electric energy meter can be accurately obtained. Furthermore, deviation detection is performed under the joint action of the register value and the manganese-copper resistance, and the influence of the manganese-copper resistance of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter is fully considered, and the deviation detection accuracy of the single-phase electric energy meter is significantly improved, thereby reducing the error out-of-tolerance failure rate caused by the manganese-copper resistance problem of the internal relay during the initial error calibration of the single-phase electric energy meter, and enhancing the reliability of the single-phase electric energy meter; The problem of low deviation detection accuracy of a single-phase electric energy meter due to difficulty in accurately obtaining the manganese copper resistance value of an internal relay of the single-phase electric energy meter is solved.

[0013] The present invention also provides a deviation detection device for a single-phase electric energy meter, comprising: A reading module, used for obtaining a register value based on a difference between a meter measurement value of the single-phase electric energy meter to be detected and a standard measurement value of a standard electric energy meter; A target resistance value acquisition module, used to obtain the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected; The judgment module is used to perform deviation detection based on the value of the register and the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected.

[0014] Since the value of the register is related to the first pulse constant, and the first pulse constant is related to the manganese-copper resistance of the relay and the electrical signal input to the single-phase electric energy meter, the relationship between the value of the register and the manganese-copper resistance of the relay in the single-phase electric energy meter can be inferred through the first pulse constant, and then the target resistance acquisition module is used to accurately obtain the manganese-copper resistance of the relay in the single-phase electric energy meter. Furthermore, a judgment module is used to perform deviation detection under the joint action of the register value and the manganese-copper resistance, which fully considers the influence of the manganese-copper resistance of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter, and significantly improves the deviation detection accuracy of the single-phase electric energy meter, thereby reducing the error out-of-tolerance failure rate caused by the manganese-copper resistance problem of the internal relay during the initial error calibration of the single-phase electric energy meter, and enhancing the reliability of the single-phase electric energy meter.

[0015] Preferably, the reading module includes a register reading module and a register control module, and the register control module is used to control the register reading module to use a first formula to obtain the register value GP when it is judged that the difference between the meter measurement value of the single-phase energy meter to be detected and the standard measurement value of the standard energy meter is less than a preset difference, and to use a second formula to obtain the register value GP when it is judged that the calibration error value is greater than or equal to the preset value. By preliminarily screening out single-phase energy meters with obvious errors, detection resources are saved and detection efficiency is improved.

[0016] Preferably, the target resistance acquisition module also includes a first pulse constant acquisition module and a manganese bronze resistance acquisition module, wherein the first pulse constant acquisition module is used to acquire the first pulse constant of the single-phase electric energy meter to be detected based on the value of the register and the first electrical signal input to the single-phase electric energy meter to be detected, and the manganese bronze resistance acquisition module is used to obtain the manganese bronze resistance of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected. The first pulse constant acquisition module is used to acquire the precise first pulse constant, and the manganese bronze resistance acquisition module is used to process the acquired precise first pulse constant to acquire the manganese bronze resistance, thereby ensuring the accuracy of the acquired manganese bronze resistance.

[0017] Beneficial effects of this program: By judging whether the difference is greater than the preset difference, single-phase energy meters with obvious errors can be preliminarily screened out, which saves detection resources and improves detection efficiency; Since the value of the register is related to the first pulse constant, and the first pulse constant is related to the manganese-copper resistance of the relay and the electrical signal input to the single-phase electric energy meter, the relationship between the value of the register and the manganese-copper resistance of the relay in the single-phase electric energy meter can be inferred through the first pulse constant, and then the target resistance acquisition module is used to accurately obtain the manganese-copper resistance of the relay in the single-phase electric energy meter. Furthermore, a judgment module is used to perform deviation detection under the joint action of the register value and the manganese-copper resistance, which fully considers the influence of the manganese-copper resistance of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter, and significantly improves the deviation detection accuracy of the single-phase electric energy meter, thereby reducing the error out-of-tolerance failure rate caused by the manganese-copper resistance problem of the internal relay during the initial error calibration of the single-phase electric energy meter, and enhancing the reliability of the single-phase electric energy meter; The problem of low deviation detection accuracy of a single-phase electric energy meter due to difficulty in accurately obtaining the manganese copper resistance value of an internal relay of the single-phase electric energy meter is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0019] Figure 1 It is a flow chart of a deviation detection method of a single-phase electric energy meter according to the present invention; Figure 2 This is a circuit diagram of the deviation detection circuit in the comparative document CN118330545A cited in the background technology of the present invention. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0022] Embodiment 1: like Figure 1 As shown, a deviation detection method for a single-phase electric energy meter includes the following steps: S1: Obtain the value of the register based on the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter.

[0023] The S1 includes: S11: Determine whether the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is greater than a preset difference, if so, report an error, if less than, obtain a calibration error value based on the difference, and continue to execute S12; S12: Determine whether the calibration error value is greater than or equal to a preset value. If the calibration error value is greater than or equal to the preset value, use the first formula to obtain the register value GP. If the calibration error value is less than the preset value, use the second formula to obtain the register value GP.

[0024] In S11, if less than, obtaining a calibration error value based on the difference comprises: Calibration error value Wherein, err is the difference.

[0025] In S12, the first formula is GP=INT[Pg*2 15 ], the second formula is GP=INT[2 16 +Pg*2 15 ].

[0026] The relay in the single-phase electric energy meter is an electrical switching device used to cut off and restore the user's load. The standard electric energy meter is the standard meter in the calibration table.

[0027] Specifically, for example: when the single-phase electric energy meter to be detected is at 5A and the power factor is 1, the meter measurement value of the single-phase electric energy meter to be detected is 1100W, and the standard measurement value of the standard electric energy meter is 1090W, then the difference err is -0.91%, and the preset difference is set according to the demand. If it is necessary to obtain data with higher accuracy by using the single-phase electric energy meter to be detected, the preset difference is close to 0. If the preset difference is set to 1% in this embodiment, 0.91% is less than 1% at this time, so the calibration error value Pg = -err / (1+err)×100%=0.9%. In this embodiment, the preset value is 0, 0.9% is greater than 0, so the value of the register = INT[Pg*2 15 ](hexadecimal). By preliminarily screening out single-phase energy meters with obvious errors, the detection efficiency is improved while saving detection resources. By judging the relationship between the calibration error value and the preset value, different formulas can be selected to obtain the register value in a targeted manner, making the obtained register value more reasonable and accurate, thereby improving the stability and reliability of the entire detection.

[0028] S2: Based on the value of the register, a first pulse constant of the single-phase electric energy meter to be detected is obtained using a first electrical signal input to the single-phase electric energy meter to be detected, and based on the first pulse constant and a second electrical signal input to the single-phase electric energy meter to be detected, the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected is obtained.

[0029] In S2, based on the value of the register, the expression for obtaining the first pulse constant of the single-phase electric energy meter to be detected by using the first electrical signal input to the single-phase electric energy meter to be detected is: HFconst=V u *V i *(1+GQ), where HFconst is the first pulse constant of the single-phase energy meter to be tested, V u Represents the sampled voltage on the voltage channel, V iRepresents the sampled voltage on the current channel, and GQ is the value of the register.

[0030] In S2, the expression for obtaining the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected is: In the formula, R m E is the manganese copper resistance of the relay in the single-phase electric energy meter to be tested, u is the second pulse constant of the single-phase electric energy meter to be tested, U n is the input voltage of the single-phase electric energy meter to be tested, and C is a preset constant.

[0031] Specifically, the manganese copper resistance of the relay in the single-phase electric energy meter to be detected is the manganese copper resistance of the manganese copper shunt on the built-in relay of the single-phase electric energy meter to be detected. The manganese copper resistance of the manganese copper shunt is very small, generally within 200μΩ~300μΩ. The first pulse constant of the single-phase electric energy meter to be detected is the pulse constant of the pulse generator inside the metering chip in the single-phase electric energy meter to be detected. In addition to being based on the value of the register, the first pulse constant of the single-phase electric energy meter to be detected can be obtained using the first electrical signal input to the single-phase electric energy meter to be detected, and can also be set manually. The second pulse constant of the single-phase electric energy meter to be detected is the pulse constant of the single-phase electric energy meter to be detected, which generally defaults to 2000imp / kWh.

[0032] Specifically, C = 16.1079*5*16*10 11 , HFconst can also be equal to V i =I b *R m *16, U n For 220V, I b For 5A, the value of register GQ ranges from -1 to 1.

[0033] By obtaining the precise manganese-copper resistance value, further, deviation detection is performed under the joint action of the register value and the manganese-copper resistance value, and the influence of the manganese-copper resistance value of the internal relay of the single-phase electric energy meter on the deviation detection of the single-phase electric energy meter during the initial error calibration of the single-phase electric energy meter is fully considered, and the deviation detection accuracy of the single-phase electric energy meter is significantly improved, thereby reducing the error failure rate caused by the manganese-copper resistance value problem of the internal relay during the initial error calibration of the single-phase electric energy meter, and enhancing the reliability of the single-phase electric energy meter.

[0034] S3: Perform deviation detection based on the register value and the manganese copper resistance of the relay in the single-phase electric energy meter to be detected.

[0035] The S3 includes: S31: Determine whether the manganese copper resistance of the relay is within a preset resistance range. If the manganese copper resistance of the relay is within the preset resistance range, execute S32. If not, it indicates that there is a deviation in the single-phase electric energy meter to be detected. S32: Determine whether the value of the register is within a preset storage range. If the value of the register is within the preset storage range, it indicates that there is no deviation in the single-phase electric energy meter to be detected. If the value of the register is not within the preset storage range, it indicates that there is a deviation in the single-phase electric energy meter to be detected.

[0036] The preset resistance range and the preset register range are flexibly set according to the usage scenario of the single-phase energy meter. The process of deviation detection based on the register value and the manganese copper resistance of the relay in the single-phase energy meter to be detected is based on the completion of the effective gain correction calibration. The upper computer software reads the channel power gain calibration register value inside the metering chip, and compares the register value and the manganese copper resistance value with the internal preset range. If the register value and the manganese copper resistance value are both within their respective ranges, it means that there is no deviation in the single-phase energy meter to be detected. If there is no deviation in the single-phase energy meter to be detected, it means that there is no fault in the single-phase energy meter to be detected and it can be put into use. If there is a deviation in the single-phase energy meter to be detected, it means that there is a fault in the single-phase energy meter to be detected and it cannot be put into use. Through the dual judgment of the manganese copper resistance value and the register value, the single-phase energy meter with performance problems can be accurately detected, thereby effectively reducing the failure rate of single-phase energy meters with insufficient metering accuracy and excessive errors during factory recalibration.

[0037] The specific steps for effective gain correction calibration are: 1. Calibration initialization a) Adjust the output parameters of the calibration table to [φ=0°, 220V, 5A], and power on the single-phase energy meter normally; b) After the calibration platform is stable, input HFConst, issue the calibration initialization command, and clear the calibration register value of the single-phase energy meter chip.

[0038] 2. Effective gain correction a) The output of the calibration table [φ=0°, 220V, 5A] remains stable; b) Input the voltage, current and active power data on the standard meter in the calibration table, and send the error calibration command. At this time, the error of the single-phase energy meter will jump to a reasonable range.

[0039] 3. Determination of effective gain correction value If the register value is within the set value range, continue to calibrate the meter. If the value read back is not within the preset register range and the manganese copper resistance is not within the preset resistance range, the meter is selected as a faulty meter.

[0040] 4. Phase correction a) Adjust the output parameters of the calibration table to [φ=60°, 220V, 5A]; b) After the calibration table is stable, input the voltage, current and active power data on the standard meter in the calibration table, and send the error calibration command. At this time, the error of the single-phase energy meter will jump to a reasonable range.

[0041] 5. Active power correction (small current correction) a) Adjust the output parameters of the calibration table to [φ=0°, 220V, 0.25A]; b) After the calibration table is stable, input the voltage, current and active power data on the standard meter in the calibration table, and send the error calibration command. At this time, the error of the single-phase energy meter will jump to a reasonable range.

[0042] 6. Current bias correction a) Adjust the calibration table to [φ=0°, 220V, 0A]; b) After the calibration table is stable, input the voltage, current and active power data on the standard meter in the calibration table, send the error calibration command, and calibrate the meter voltage and A channel current effective value.

[0043] 7. Zero line coefficient correction a) Adjust the calibration table to channel B, [φ=0°, 220V, 5A]; b) After the calibration table is stable, input the current data on the standard meter in the calibration table, send the error calibration command, and calibrate the effective value of the current on the meter B channel.

[0044] Embodiment 2: This embodiment also provides a deviation detection device for a single-phase electric energy meter, comprising: A reading module, used for obtaining a register value based on a difference between a meter measurement value of the single-phase electric energy meter to be detected and a standard measurement value of a standard electric energy meter; A target resistance value acquisition module, used to obtain the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected; The judgment module is used to perform deviation detection based on the value of the register and the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected.

[0045] The reading module includes a register reading module and a register control module. The register control module is used to control the register reading module to use the first formula to obtain the register value GP when it is judged that the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is less than the preset difference, and to use the second formula to obtain the register value GP when it is judged that the calibration error value is greater than or equal to the preset value when the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is less than the preset difference.

[0046] The target resistance acquisition module also includes a first pulse constant acquisition module and a manganese-copper resistance acquisition module. The first pulse constant acquisition module is used to obtain the first pulse constant of the single-phase electric energy meter to be detected based on the value of the register and the first electrical signal input to the single-phase electric energy meter to be detected. The manganese-copper resistance acquisition module is used to obtain the manganese-copper resistance of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected.

[0047] Specifically, for example: when the single-phase electric energy meter to be detected is at 5A and the power factor is 1, the meter measurement value of the single-phase electric energy meter to be detected is 1100W, and the standard measurement value of the standard electric energy meter is 1090W, then the difference err is -0.91%, and the preset difference is set according to demand. If it is necessary to obtain data with higher accuracy by using the single-phase electric energy meter to be detected, the preset difference is close to 0. In this embodiment, the preset value is 0.

[0048] Specifically, the manganese copper resistance of the relay in the single-phase electric energy meter to be detected is the manganese copper resistance of the manganese copper shunt on the built-in relay of the single-phase electric energy meter to be detected, and the first pulse constant of the single-phase electric energy meter to be detected is the pulse constant of the internal pulse generator of the metering chip in the single-phase electric energy meter to be detected. In addition to being based on the value of the register, the first pulse constant of the single-phase electric energy meter to be detected can be obtained using the first electrical signal input to the single-phase electric energy meter to be detected, and can also be manually set. The second pulse constant of the single-phase electric energy meter to be detected is the pulse constant of the single-phase electric energy meter to be detected, which generally defaults to 2000imp / kWh.

[0049] Specifically, the process of deviation detection based on the register value and the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected is based on the completion of the effective gain correction calibration. The upper computer software reads the channel power gain calibration register value inside the metering chip, and compares the register value and the manganese copper resistance value with the internal pre-set range. If the register value and the manganese copper resistance value are both within their respective ranges, it means that there is no deviation in the single-phase electric energy meter to be detected. If there is no deviation in the single-phase electric energy meter to be detected, it means that there is no fault in the single-phase electric energy meter to be detected and it can be put into use. If there is a deviation in the single-phase electric energy meter to be detected, it means that there is a fault in the single-phase electric energy meter to be detected and it cannot be put into use. Through the dual judgment of the manganese copper resistance value and the register value, single-phase electric energy meters with performance problems can be accurately detected, thereby effectively reducing the failure rate of single-phase electric energy meters with problems such as insufficient metering accuracy and excessive errors during factory recalibration.

[0050] The specific implementation described above is a preferred implementation of a deviation detection method and device for a single-phase electric energy meter of the present invention, and is not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation. All equivalent changes made in accordance with the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. A method for detecting deviation of a single-phase electric energy meter, characterized in that: The following steps are involved: S1: Obtaining a register value based on a difference between a meter measurement value of the single-phase energy meter to be detected and a standard measurement value of a standard energy meter; S2: Based on the value of the register, a first pulse constant of the single-phase electric energy meter to be detected is obtained using a first electrical signal input to the single-phase electric energy meter to be detected, and a manganese copper resistance value of a relay in the single-phase electric energy meter to be detected is obtained based on the first pulse constant and a second electrical signal input to the single-phase electric energy meter to be detected; S3: Perform deviation detection based on the register value and the manganese copper resistance of the relay in the single-phase electric energy meter to be detected.

2. The deviation detection method of a single-phase electric energy meter according to claim 1, characterized in that: The S1 includes: S11: Determine whether the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is greater than a preset difference, if so, report an error, if less than, obtain a calibration error value based on the difference, and continue to execute S12; S12: Determine whether the calibration error value is greater than or equal to a preset value. If the calibration error value is greater than or equal to the preset value, use the first formula to obtain the register value GP. If the calibration error value is less than the preset value, use the second formula to obtain the register value GP.

3. The deviation detection method of a single-phase electric energy meter according to claim 2, characterized in that: In S11, if less than, obtaining a calibration error value based on the difference comprises: Calibration error value Wherein, err is the difference.

4. The deviation detection method of a single-phase electric energy meter according to claim 3 is characterized in that: In S12, the first formula is GP=INT[Pg*2 15 ], the second formula is GP=INT[2 16 +Pg*2 15 ].

5. The deviation detection method of a single-phase electric energy meter according to claim 1, characterized in that: In S2, based on the value of the register, the expression for obtaining the first pulse constant of the single-phase electric energy meter to be detected by using the first electrical signal input to the single-phase electric energy meter to be detected is: HFconst=V u *V i *(1+GQ), where HFconst is the first pulse constant of the single-phase energy meter to be tested, V u Represents the sampled voltage on the voltage channel, V i Represents the sampled voltage on the current channel, and GQ is the value of the register.

6. The method for detecting deviation of a single-phase electric energy meter according to claim 5, characterized in that: In S2, the expression for obtaining the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected is: In the formula, R m E is the manganese copper resistance of the relay in the single-phase electric energy meter to be tested, u is the second pulse constant of the single-phase electric energy meter to be tested, U n is the input voltage of the single-phase electric energy meter to be tested, and C is a preset constant.

7. The deviation detection method of a single-phase electric energy meter according to claim 1, characterized in that: The S3 includes: S31: Determine whether the manganese copper resistance of the relay is within a preset resistance range. If the manganese copper resistance of the relay is within the preset resistance range, execute S32. If not, it indicates that there is a deviation in the single-phase electric energy meter to be detected. S32: Determine whether the value of the register is within a preset storage range. If the value of the register is within the preset storage range, it indicates that there is no deviation in the single-phase electric energy meter to be detected. If the value of the register is not within the preset storage range, it indicates that there is a deviation in the single-phase electric energy meter to be detected.

8. A deviation detection device for a single-phase electric energy meter, applicable to a deviation detection method for a single-phase electric energy meter according to any one of claims 1 to 7, characterized in that: include: A reading module, used for obtaining a register value based on a difference between a meter measurement value of the single-phase electric energy meter to be detected and a standard measurement value of a standard electric energy meter; A target resistance value acquisition module, used to obtain the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected; The judgment module is used to perform deviation detection based on the value of the register and the manganese copper resistance value of the relay in the single-phase electric energy meter to be detected.

9. The deviation detection device for a single-phase electric energy meter according to claim 8, characterized in that: The reading module includes a register reading module and a register control module. The register control module is used to control the register reading module to use the first formula to obtain the register value GP when it is judged that the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is less than the preset difference, and to use the second formula to obtain the register value GP when it is judged that the calibration error value is greater than or equal to the preset value when the difference between the meter measurement value of the single-phase electric energy meter to be detected and the standard measurement value of the standard electric energy meter is less than the preset difference.

10. The deviation detection device for a single-phase electric energy meter according to claim 8, characterized in that: The target resistance acquisition module also includes a first pulse constant acquisition module and a manganese-copper resistance acquisition module. The first pulse constant acquisition module is used to obtain the first pulse constant of the single-phase electric energy meter to be detected based on the value of the register and the first electrical signal input to the single-phase electric energy meter to be detected. The manganese-copper resistance acquisition module is used to obtain the manganese-copper resistance of the relay in the single-phase electric energy meter to be detected based on the first pulse constant and the second electrical signal input to the single-phase electric energy meter to be detected.

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