Automatic detection device, method and medium for overload protection electric meter

Abstract

An automatic detection device, method, and medium for overload protection electric meters include a power supply module, a sampler, and an error measurement module. The output end of the power supply module is connected to multiple meters under test. A sampler and a temperature sensor are connected between each meter under test and the error measurement module. The error measurement module is connected to a host computer via a communication module. A Hall sensor is also connected between the error measurement module and the output end of the power supply module. The error measurement module is used to calculate the electrical energy of an analog standard meter based on collected current and voltage data and a temperature compensation coefficient, and then perform an error comparison between the electrical energy of the analog standard meter and the meter under test. The error measurement module is connected to the power supply module via a control module. The present invention can simultaneously determine whether the meter under test is qualified and whether temperature compensation is required. It has high detection accuracy, avoids complex calculations, improves detection efficiency, reduces processor workload, and has high reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meter detection, and in particular to an automatic detection device, method and medium for an overload protection electric energy meter. Background Art

[0002] As urban power grids continue to become more intelligent, smart meters are playing an increasingly important role. Since meter errors directly impact the economic benefits of both the supplier and the user, both parties place extremely high demands on meter accuracy. As the primary method of metering in future power grids, the accuracy of smart meters has garnered widespread attention.

[0003] Smart electricity meters must undergo unified calibration before leaving the factory. However, the existing calibration method only corrects the measurement values ​​of each meter under normal temperature conditions and adjusts the measurement accuracy before the electricity meter leaves the factory. It does not take into account the wide temperature range environment in which the electricity meter actually works. Therefore, it does not fundamentally eliminate or reduce the measurement error caused by temperature changes.

[0004] The invention patent application number is 202110421641.4, which discloses an electric energy meter detection system. The system includes a terminal, a calibration device, and a multi-serial port server. The terminal and the calibration device are connected to each other through the multi-serial port server. The calibration device includes a camera, which is used to capture the appearance image of the electric energy meter under test and send the appearance image to the terminal through the multi-serial port server. The terminal includes an appearance unit, which is used to compare the appearance image with a locally stored preset appearance image to determine the appearance defects of the electric energy meter under test. Because the electric energy meter detection process is carried out by machine equipment, no manual inspection is required, and automatic inspection of the electric energy meter is achieved, which improves the inspection efficiency of the electric energy meter and improves the consistency of product performance among the electric energy meters classified for reuse after inspection. However, when detecting electric energy meter errors, this solution requires the use of a standard meter as a judgment basis, which increases the complexity of operation and wiring, increases the production cost of the detection system, does not consider the impact of temperature on the detection results, has low detection accuracy, and cannot judge and adjust the status of the electric energy meter based on the detection error. Summary of the Invention

[0005] To address the deficiencies in the prior art, the present invention provides an automatic detection device, method, and medium for an overload protection meter, which solves the problem of metering errors caused by temperature changes after the meter leaves the factory and improves the meter detection efficiency and accuracy.

[0006] The present invention adopts the following technical solutions.

[0007] An automatic detection device for an overload protection electric meter, comprising: a power supply module, a sampler, a temperature sensor, a Hall sensor, an error measurement module, a communication module and a host computer;

[0008] The output end of the power supply module is connected to multiple meters under test to provide a three-phase current and voltage source;

[0009] One end of the sampler is connected to the meter under test, and the other end is connected to the error measurement module, for collecting the electric power data of the meter under test and transmitting the electric power data to the error measurement module;

[0010] One end of the temperature sensor is connected to the meter under test, and the other end is connected to the error measurement module, for collecting ambient temperature data and transmitting the ambient temperature data to the error measurement module;

[0011] One end of the Hall sensor is connected to the power supply module, and the other end is connected to the error measurement module. The Hall sensor is used to collect current and voltage data from the output end of the power supply module and transmit the collected current and voltage data to the error measurement module;

[0012] One end of the communication module is connected to the error measurement module, and the other end is connected to the host computer for communication transmission;

[0013] The error measurement module sends the ID of the meter under test and the ambient temperature data to the host computer through the communication module. The ID of the meter under test is stored in a memory connected to the error measurement module, and the error measurement module directly calls it when needed.

[0014] The host computer includes a memory that stores temperature compensation functions for different types of electric energy meters. The host computer obtains the model of the meter under test based on the ID of the meter under test and obtains ambient temperature data at the same time. The host computer uses the ambient temperature data to calculate the temperature compensation coefficient corresponding to the meter under test model and then transmits the temperature compensation coefficient to the error measurement module through the communication module.

[0015] The error measurement module calculates the electrical energy of the analog standard meter based on the current and voltage data collected by the Hall sensor and the temperature compensation coefficient, and then compares the electrical energy of the analog standard meter with that of the meter under test to obtain the error result.

[0016] Preferably, the automatic detection device further comprises a control module,

[0017] One end of the control module is connected to the error measurement module, and the other end is connected to the power supply module.

[0018] The error metering module calculates the electric power based on the current and voltage transmitted by the Hall sensor. The error metering module determines whether the electric power exceeds the set threshold. If it exceeds the threshold, it sends an overload signal to the control module.

[0019] The power supply module includes a power supply, an overload protection circuit and a power source connected in sequence;

[0020] The power supply is used to provide working power; the overload protection circuit includes a switch unit and an overload signal input unit. When the control module receives the overload signal through the overload signal input unit, it controls the disconnection of the switch unit;

[0021] The power source is used to output a three-phase current and voltage source.

[0022] An automatic detection method for an overload protection electric meter, comprising:

[0023] Step 1: Based on historical electric energy meter experimental data, calculate the temperature compensation function of various types of electric energy meters, and calculate the temperature compensation coefficient using the temperature compensation function;

[0024] Step 2: Collect the electric power, real-time ambient temperature, voltage and current data of the meter under test and transmit them to the error measurement module;

[0025] Step 3: Obtain the corresponding temperature compensation coefficient according to the model of the meter being tested and the ambient temperature;

[0026] Step 4: Calculate the electric power Pb of the analog standard meter based on the voltage and current data collected by the Hall sensor, and calculate the compensated electric power Pc of the analog standard meter with reference to the temperature compensation function;

[0027] Step 5: Within the time interval T, the electric energy Wc of the analog standard meter and the electric energy Wa of the meter under test are detected simultaneously, and an error comparison is performed to obtain an error value ε;

[0028] Step 6: Refer to the error value ε to determine whether the meter under test is in a qualified state and whether temperature compensation is required.

[0029] Preferably, in step 4, the voltage and current data collected by the Hall sensor are multiplied to obtain the electric power Pb of the analog standard meter, and the current ambient temperature t is substituted into the temperature compensation function to obtain the temperature compensation coefficient, that is, the electric power difference d. Then, the electric power Pc of the compensated analog standard meter is Pb+d; wherein, when the ambient temperature t is greater than 23°C, d is a positive number; when the ambient temperature t is less than 23°C, d is a negative number.

[0030] In step 5, the error value ε is calculated as follows:

[0031] ε=|Wc-Wa|, Wc=Pc×T, Wa=Pa×T

[0032] Where Pa represents the electric power of the meter under test.

[0033] In step 6, referring to the error value ε, it is determined whether the meter under test is in a qualified state and whether temperature compensation is required, including:

[0034] If 0≤ε≤D1, it means that the meter under test is qualified and no temperature compensation is required;

[0035] If D1<ε<D2, it means that the meter under test is qualified, but temperature compensation is required;

[0036] If ε>D2, it means that the inspected table is unqualified;

[0037] Wherein, D1 represents the temperature compensation setting value in the detection standard;

[0038] D2 represents the qualified temperature setting value in the detection standard.

[0039] Preferably, in step 6, temperature compensation includes: when the ambient temperature t is greater than 23°C, adding a temperature compensation coefficient before the meter under test outputs electric power; when the ambient temperature t is less than 23°C, subtracting the temperature compensation coefficient before the meter under test outputs electric power.

[0040] A terminal comprising a processor and a storage medium; characterized in that:

[0041] The storage medium is used to store instructions;

[0042] The processor is used to operate according to the instructions to execute the steps of an automatic detection method for an overload protection electric meter.

[0043] A computer-readable storage medium stores a computer program thereon, wherein when the program is executed by a processor, the program implements the steps of an automatic detection method for an overload protection electric meter.

[0044] The beneficial effect of the present invention is that, compared with the prior art,

[0045] 1) A sampler and a temperature sensor are set between the meter under test and the error measurement module to collect the electric power data and ambient temperature data of the meter under test respectively. The current and voltage data of the output end of the power supply module are collected through the Hall sensor. The error measurement module calculates the electric energy of the analog standard meter based on the collected current and voltage data and the temperature compensation coefficient obtained from the memory of the host computer. The error comparison between the electric energy of the analog standard meter and the meter under test is then carried out. It can simultaneously determine whether the meter under test is qualified and whether temperature compensation is required, with high detection accuracy.

[0046] 2) Using the pre-stored historical electricity meter experimental data, the temperature compensation function of various types of electricity meters is calculated. The temperature compensation coefficient of the electricity meter can be obtained by inputting the ambient temperature. The calculation process is simple, avoiding complex calculations, improving detection efficiency, reducing processor workload, and having high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural diagram of the automatic detection device for overload protection electric meter of the present invention. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without making creative efforts are all within the scope of protection of the present invention.

[0049] Example 1.

[0050] The invention discloses an automatic detection device for an overload protection electric meter.

[0051] like Figure 1 An automatic detection device for an overload protection electric meter includes a power supply module, a sampler, a temperature sensor, a Hall sensor, an error measurement module, a control module, a communication module and a host computer.

[0052] The output end of the power supply module is connected to multiple meters under test to provide a three-phase current and voltage source. A sampler and a temperature sensor are connected between each meter under test and the error measurement module.

[0053] One end of the sampler is connected to the meter under test, and the other end is connected to the error measurement module, for collecting the electric power data of the meter under test and transmitting the electric power data to the error measurement module;

[0054] One end of the temperature sensor is connected to the meter under test, and the other end is connected to the error measurement module, for collecting ambient temperature data and transmitting the ambient temperature data to the error measurement module;

[0055] One end of the communication module is connected to the error measurement module, and the other end is connected to the host computer, which plays the role of communication transmission. It can adopt wireless (Bluetooth, WIFI) or wired transmission (RS232, RS484).

[0056] One end of the Hall sensor is connected to the power supply module, and the other end is connected to the error measurement module. The Hall sensor is used to collect current and voltage data at the output end of the power supply module and transmit the collected current and voltage data to the error measurement module.

[0057] The error measurement module sends the ID of the meter under test and the ambient temperature data to the host computer through the communication module. The ID of the meter under test is stored in a memory connected to the error measurement module, and the error measurement module directly calls it when needed.

[0058] The host computer includes a memory that stores temperature compensation functions for different types of electric energy meters. The host computer obtains the model of the meter under test based on the ID of the meter under test and obtains ambient temperature data at the same time. The host computer uses the ambient temperature data to calculate the temperature compensation coefficient corresponding to the meter under test model and then transmits the temperature compensation coefficient to the error measurement module through the communication module.

[0059] The error measurement module calculates the electrical energy of the analog standard meter based on the current and voltage data collected by the Hall sensor and the temperature compensation coefficient, and then compares the electrical energy of the analog standard meter with that of the meter under test to obtain the error result.

[0060] The error measurement module is used to calculate the electrical energy of the analog standard meter based on the current and voltage data collected by the Hall sensor and the temperature compensation coefficient, and then compare the electrical energy of the analog standard meter with that of the meter under test to obtain the error result.

[0061] The control module is connected to the error metering module at one end and to the power supply module at the other, regulating the module's output power. The error metering module calculates the electrical power based on the current and voltage transmitted by the Hall effect sensor. It then determines whether the electrical power exceeds a set threshold and, if so, sends an overload signal to the control module.

[0062] In this embodiment, the power supply module preferably includes a power supply, an overload protection circuit, and a power source, which are sequentially connected. The power supply is used to provide operating power. The overload protection circuit includes a switch unit and an overload signal input unit. When the control module receives an overload signal through the overload signal input unit, it controls the disconnection of the switch unit. The power source is used to output a three-phase current and voltage source. When the output power exceeds a set threshold, the control module controls the disconnection of the switch unit to prevent circuit damage.

[0063] Example 2.

[0064] A detection method for an automatic detection device of an overload protection electric meter, comprising the following steps:

[0065] Step 1: Based on historical electric energy meter experimental data, temperature compensation functions of various types of electric energy meters are calculated, and temperature compensation coefficients are calculated using the temperature compensation functions.

[0066] Among them, the historical electric energy meter experimental data includes: ambient temperature, electric power, electric power difference

[0067] Specifically, the temperature compensation functions of various types of electricity meters are calculated, including:

[0068] Step 1.1: Select two standard electric energy meters and two experimental electric energy meters of the same model and place them in a constant temperature box and a working environment respectively for comparative experiments.

[0069] In this embodiment, the temperature of the constant temperature box is set to 23°C, and the working environment temperature is in the range of -50°C to 80°C, with a value taken at every 0.5°C interval.

[0070] Step 1.2: Under the same ambient temperature, record the electric power of the standard electric energy meter and the experimental electric energy meter at the same time, and calculate the electric power difference d.

[0071] For example, if the ambient temperature is 38°C, the electric powers measured by the standard electric energy meter and the experimental electric energy meter at the same time are 3.2KW and 3.201KW respectively. At this ambient temperature, the electric power difference d is 0.001KW.

[0072] Step 1.3: Change the ambient temperature, repeatedly record multiple sets of electric power, obtain multiple sets of electric power difference values ​​d, and generate discrete points of the electric power difference value d and the ambient temperature t.

[0073] In step 1.4, Origin software is used to fit the curve to the discrete points to obtain the temperature compensation function d(t).

[0074] d(t)=a0+a1t+a2t 2 +a n t n +ε

[0075] Where a0-an is the coefficient, ε is the error, n is a natural number, and t is the temperature.

[0076] Origin, developed by OriginLab, is a scientific graphing and data analysis software that runs on Microsoft Windows. Origin supports a wide variety of 2D / 3D graphs. Origin's data analysis capabilities include statistics, signal processing, curve fitting, and peak analysis. Curve fitting in Origin utilizes nonlinear least squares fitting based on the Levernberg-Marquardt algorithm (LMA).

[0077] In step 1.5, substitute the ambient temperature t of the meter under test into the temperature compensation function d(t) to obtain the temperature compensation coefficient.

[0078] Step 2: Collect the power, real-time ambient temperature, voltage and current data of the meter under test and transmit them to the error measurement module.

[0079] Step 2.1: Obtain the electric power Pa of the meter under test through the sampler and transmit it to the error measurement module.

[0080] The electric power Pa of the meter under test is obtained by multiplying the current and voltage values ​​detected by its internal current transformer and voltage transformer.

[0081] Step 2.2: Obtain the ambient temperature of the meter under test through the temperature sensor and transmit it to the error measurement module.

[0082] Step 2.3: The Hall sensor obtains the voltage and current data at the output end of the power supply module and transmits them to the error measurement module.

[0083] Step 3: Obtain the corresponding temperature compensation coefficient according to the model of the meter under test and the ambient temperature.

[0084] The host computer's memory stores temperature compensation functions for several types of electricity meters. Based on the model ID of the meter being tested, it searches for the corresponding temperature compensation function and substitutes the current ambient temperature to calculate the temperature compensation coefficient. The meter's model ID is stored in memory connected to the error measurement module and can be directly called upon when needed.

[0085] Step 4: Calculate the electric power Pb of the analog standard meter based on the voltage and current data collected by the Hall sensor, and calculate the compensated electric power Pc with reference to the temperature compensation function.

[0086] Multiplying the voltage and current data collected by the Hall effect sensor yields the analog standard power Pb. Substituting the current ambient temperature t into the temperature compensation function yields the temperature compensation coefficient, or power difference d. The compensated power Pc = Pb + d. When the ambient temperature t is greater than 23°C, d is positive; otherwise, it is negative.

[0087] Step 5: Within the time interval T, the electric energy Wc of the analog standard meter and the electric energy Wa of the meter under test are simultaneously detected, and an error comparison is performed to obtain an error value ε, where ε = |Wc-Wa|, Wc = Pc*T, Wa = Pa*T; where Pa represents the electric power of the meter under test.

[0088] Step 6: Refer to the error value ε to determine whether the meter under test is in a qualified state and whether temperature compensation is required.

[0089] Specifically, referring to the error value ε, it is determined whether the meter under test is in a qualified state and whether temperature compensation is required, including:

[0090] If 0≤ε≤D1, it means that the meter under test is qualified and no temperature compensation is required.

[0091] If D1<ε<D2, it means that the meter under test is qualified, but temperature compensation is required.

[0092] If ε is greater than D2, it means the inspected table is unqualified.

[0093] Where D1 and D2 are the temperature compensation setting value and qualified setting value in the detection standard respectively.

[0094] Temperature compensation includes: when the ambient temperature t is greater than 23°C, the temperature compensation coefficient is added before the meter under test outputs electric power; when the ambient temperature t is less than 23°C, the temperature compensation coefficient is subtracted before the meter under test outputs electric power.

[0095] Example 3.

[0096] A third embodiment of the present invention provides a computer-readable storage medium.

[0097] A computer-readable storage medium stores a program thereon, which, when executed by a processor, implements the steps of a detection method of an automatic detection device for an overload protection meter as described in embodiment 2 of the present invention.

[0098] The detailed steps are the same as those of the detection method of the automatic detection device for an overload protection electric meter provided in Example 2, and will not be repeated here.

[0099] Example 4.

[0100] Embodiment 4 of the present invention provides an electronic device.

[0101] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the steps of the detection method of an automatic detection device for an overload protection meter as described in Example 2 of the present invention are implemented.

[0102] The beneficial effect of the present invention is that, compared with the prior art, a sampler and a temperature sensor are provided between the meter under test and the error meter module, respectively used to collect the electric power data and ambient temperature data of the meter under test, and the current and voltage data at the output end of the power supply module are collected by the Hall sensor. The error meter module calculates the electric energy of the analog standard meter based on the collected current and voltage data and obtains the temperature compensation coefficient from the memory of the host computer. The error comparison between the electric energy of the analog standard meter and the meter under test is then performed, and it can simultaneously determine whether the meter under test is qualified and whether temperature compensation is required, with high detection accuracy. The temperature compensation function of various types of electric energy meters is calculated by using pre-stored historical electric energy meter experimental data, and the temperature compensation coefficient of the electric energy meter can be obtained by inputting the ambient temperature. The calculation process is simple, complex calculations are avoided, detection efficiency is improved, processor workload is reduced, and reliability is high.

[0103] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0104] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0105] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0106] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., utilizing an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions. The electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0107] Various aspects of the present disclosure are described herein with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer-readable program instructions.

[0108] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device is generated that implements the functions / actions specified in one or more blocks in the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, where these instructions cause the computer, programmable data processing device, and / or other device to operate in a specific manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0109] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0110] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present disclosure. In this regard, each box in the flow chart or block diagram can represent a part of a module, program segment or instruction, and the part of the module, program segment or instruction contains one or more executable instructions for realizing the prescribed logical function. In some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the prescribed function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. An automatic detection device for overload protection electric meter, characterized in that: The device includes: a power supply module, a sampler, a temperature sensor, a Hall sensor, an error measurement module, a communication module and a host computer; The output end of the power supply module is connected to multiple meters under test to provide a three-phase current and voltage source; One end of the sampler is connected to the meter under test, and the other end is connected to the error measurement module, for collecting the electric power data of the meter under test and transmitting the electric power data to the error measurement module; One end of the temperature sensor is connected to the meter under test, and the other end is connected to the error measurement module, for collecting ambient temperature data and transmitting the ambient temperature data to the error measurement module; One end of the Hall sensor is connected to the power supply module, and the other end is connected to the error measurement module. The Hall sensor is used to collect current and voltage data from the output end of the power supply module and transmit the collected current and voltage data to the error measurement module; One end of the communication module is connected to the error measurement module, and the other end is connected to the host computer for communication transmission; The error measurement module sends the ID of the meter under test and the ambient temperature data to the host computer through the communication module. The ID of the meter under test is stored in a memory connected to the error measurement module, and the error measurement module directly calls it when needed. The host computer includes a memory that stores temperature compensation functions for different types of electric energy meters. The host computer obtains the model of the meter under test based on the ID of the meter under test and obtains ambient temperature data at the same time. The host computer uses the ambient temperature data to calculate the temperature compensation coefficient corresponding to the meter under test model and then transmits the temperature compensation coefficient to the error measurement module through the communication module. The error measurement module calculates the electrical energy of the analog standard meter based on the current and voltage data collected by the Hall sensor and the temperature compensation coefficient. It then compares the electrical energy of the analog standard meter with that of the meter being tested to obtain the error result to determine whether the meter being tested is in a qualified state and whether temperature compensation is required.

2. The automatic detection device for overload protection electric meter according to claim 1, characterized in that: The automatic detection device also includes a control module, One end of the control module is connected to the error measurement module, and the other end is connected to the power supply module. The error metering module calculates the electric power based on the current and voltage transmitted by the Hall sensor. The error metering module determines whether the electric power exceeds the set threshold. If it exceeds the threshold, it sends an overload signal to the control module.

3. The automatic detection device for overload protection electric meter according to claim 2, characterized in that: The power supply module includes a power supply, an overload protection circuit and a power source connected in sequence; The power supply is used to provide working power; the overload protection circuit includes a switch unit and an overload signal input unit. When the control module receives the overload signal through the overload signal input unit, it controls the disconnection of the switch unit; The power source is used to output a three-phase current and voltage source.

4. A method for automatically detecting an overload protection meter based on the device according to any one of claims 1 to 3, characterized in that: The method comprises: Step 1: Based on historical electric energy meter experimental data, calculate the temperature compensation function of various types of electric energy meters, and calculate the temperature compensation coefficient using the temperature compensation function; Step 2: Collect the electric power, real-time ambient temperature, voltage and current data of the meter under test and transmit them to the error measurement module; Step 3: Obtain the corresponding temperature compensation coefficient according to the model of the meter being tested and the ambient temperature; Step 4: Calculate the electric power Pb of the analog standard meter based on the voltage and current data collected by the Hall sensor, and calculate the compensated electric power Pc of the analog standard meter with reference to the temperature compensation function; Step 5: Within the time interval T, the electric energy Wc of the analog standard meter and the electric energy Wa of the meter under test are detected simultaneously, and an error comparison is performed to obtain an error value ε; Step 6: Refer to the error value ε to determine whether the meter under test is in a qualified state and whether temperature compensation is required.

5. The automatic detection method for overload protection electric meter according to claim 4, characterized in that: In step 4, the voltage and current data collected by the Hall sensor are multiplied to obtain the electric power Pb of the analog standard meter. The current ambient temperature t is substituted into the temperature compensation function to obtain the temperature compensation coefficient, that is, the electric power difference d. Then, the electric power Pc of the compensated analog standard meter is Pb+d; when the ambient temperature t is greater than 23°C, d is a positive number; when the ambient temperature t is less than 23°C, d is a negative number.

6. The automatic detection method for overload protection electric meter according to claim 4, characterized in that: In step 5, the error value ε is calculated as follows: ε=|Wc-Wa|, Wc=Pc×T, Wa=Pa×T Where Pa represents the electric power of the meter under test.

7. The automatic detection method for overload protection electric meter according to claim 4, characterized in that: In step 6, referring to the error value ε, it is determined whether the meter under test is in a qualified state and whether temperature compensation is required, including: If 0≤ε≤D1, it means that the meter under test is qualified and no temperature compensation is required; If D1<ε<D2, it means that the meter under test is qualified, but temperature compensation is required; If ε>D2, it means that the inspected table is unqualified; Wherein, D1 represents the temperature compensation setting value in the detection standard; D2 represents the qualified temperature setting value in the detection standard.

8. The automatic detection method for overload protection electric meter according to claim 4, characterized in that: In step 6, temperature compensation includes: when the ambient temperature t is greater than 23°C, adding a temperature compensation coefficient before the meter under test outputs electric power; when the ambient temperature t is less than 23°C, subtracting the temperature compensation coefficient before the meter under test outputs electric power.

9. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instruction to execute the steps of the automatic detection method for an overload protection electric meter according to any one of claims 4 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the automatic detection method for an overload protection meter described in any one of claims 4 to 8 are implemented.

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