Field calibration device, method and system applied to single-phase electric energy metering device

Abstract

The invention provides an on-site calibration device, method and system applied to a single-phase electric energy metering device, and relates to the technical field of metering device calibration, and the device comprises a main body, a display screen and a clamp meter. A crimping panel is arranged on the lower end surface of the main body; a plurality of crimping needles are arranged on the crimping panel, and the crimping needles are matched with crimping holes formed in the single-phase electric energy metering device to realize crimping; a locking nut is arranged on the main body, the locking nut penetrates through the main body from top to bottom, and the main body is fixed on the single-phase electric energy metering device through the configuration of the locking nut and a threaded hole formed in the single-phase electric energy metering device. According to the invention, the device main body and the single-phase electric energy metering device are buckled together, a worker can leave the field only by completing buckling, and returns to the field to be taken back after the device completes automatic inspection, so that the worker efficiency and multi-point inspection are both considered, and the overall performance of the single-phase electric energy meter within the working range of the single-phase electric energy meter is inspected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metering device calibration, in particular to a device, method and system for on-site calibration of single-phase electric energy metering device. BACKGROUND

[0002] Single-phase electric energy metering device, i.e. single-phase electric energy meter, is a metering device for measuring active electric energy consumption in 220V single-phase alternating current circuit, and is widely used in household, small commercial and agricultural electric power scenes. Its core function is to convert the electric energy consumed by the load into intuitive kilowatt-hour (kWh) value, supporting mechanical or electronic metering modes. Among them, the electronic type adopts ADE7755 chip, measures the instantaneous power through voltage / current sampling and multiplier, and realizes electric energy metering through pulse accumulation; supports multi-rate charging and remote meter reading, and is suitable for residential sub-metering, commercial energy consumption monitoring, and especially suitable for peak-valley electricity price charging demand in smart grid. Based on the consideration of ensuring the fairness of metering and supporting the supervision of smart grid, the calibration of single-phase electric energy metering device is a rigid requirement. The existing single-phase electric energy metering device testing device realizes on-site calibration of single-phase electric energy meter, and the on-site calibration is connected by personnel operation. Under the uncertain condition of single-phase electric energy meter load power consumption, in order to consider personnel efficiency, the single-phase electric energy meter under the current load running condition can only be calibrated, multi-point calibration cannot be realized, and the overall performance of single-phase electric energy meter in its working range cannot be calibrated. SUMMARY

[0003] One of the purposes of the present application is to provide a device, method and system for on-site calibration of single-phase electric energy metering device to solve the above technical problems.

[0004] The device for on-site calibration of single-phase electric energy metering device provided by the embodiment of the present application comprises a main body, a display screen and a clamp-on meter. The lower end surface of the main body is provided with a crimping panel. A plurality of crimping needles are arranged on the crimping panel, and the crimping needles are matched with the crimping holes arranged on the single-phase electric energy metering device to realize crimping. A locking nut is arranged on the main body and penetrates the main body from top to bottom. The locking nut is matched with the threaded holes arranged on the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device.

[0005] Preferably, the main body is provided with a current detection module, a voltage detection module, a communication module and a processing module. The processing module is electrically connected with the current detection module, the voltage detection module, the display screen and the communication module. The current detection module is used for detecting the current on the phase line of the single-phase electric energy metering device through the clamp meter; the voltage detection module is used for detecting the voltage on the phase line; the processing module is communicatively connected with the single-phase electric energy metering device to acquire metering data, and based on the metering data, the voltage and the current, verification data is generated and displayed on the display screen.

[0006] Preferably, the clamp meter comprises a wired clamp meter or a wireless clamp meter.

[0007] Preferably, a controllable load module is further arranged in the main body; the controllable load module is electrically connected with the processing module.

[0008] The application further provides a field verification method applied to a single-phase electric energy metering device, which adopts any of the above-mentioned devices for field verification of a single-phase electric energy metering device, and comprises the following steps: After the device is connected to the single-phase electric energy metering device to be verified, the verification work is performed in a timing control mode or a current trigger control mode; Preferably, the verification work performed in the timing control mode comprises the following steps: Preferably, the verification work performed in the current trigger control mode comprises the following steps: The current detected by the current detection module is acquired; Based on the pre-configured first form and the current, it is determined whether to trigger verification; When verification is triggered, the processing module is communicatively connected with the single-phase electric energy metering device to acquire metering data, and based on the metering data, the voltage and the current, verification data is generated; When the verification data is generated, the corresponding current value in the first form is deleted; When the first form is empty, the processing module sends a verification completion prompt information to the management platform through the communication module.

[0009] Preferably, based on the pre-configured first form and the current, it is determined whether to trigger verification, which comprises the following steps: The difference between the current and each trigger current recorded in the first form is calculated; When the difference is less than or equal to the threshold value associated with the trigger current, verification is triggered.

[0010] Preferably, the field verification method applied to the single-phase electric energy metering device further comprises the following steps: When verification is triggered, the controllable load module is controlled to act so that the current flowing through the controllable load module is equal to the difference between the trigger current corresponding to the triggered verification and the monitored current.

[0011] The application further provides a field verification system applied to a single-phase electric energy metering device, which adopts any of the above-mentioned devices for field verification of a single-phase electric energy metering device, and comprises the following steps: The mode selection unit is configured to perform the verification work in a timing control mode or a current trigger control mode after the device is connected to the single-phase electric energy metering device to be verified. The verification work in the timing control mode comprises: performing data verification once every preset time interval.

[0012] Preferably, the on-site verification system applied to the single-phase electric energy metering device further comprises a detection unit, a trigger judgment unit, a verification unit, a form updating unit and a completion prompting unit; the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger verification based on the pre-configured first form and the current; when verification is triggered, the verification unit acquires the metering data by communicating with the single-phase electric energy metering device through the communication module, generates verification data based on the metering data, the voltage and the current; when the verification data is generated, the form updating unit deletes the corresponding current value in the first form; when the first form is empty, the completion prompting unit sends a verification completion prompting information to the management platform through the communication module.

[0013] Preferably, the trigger judgment unit performs the following operations: calculating the difference between the current and each trigger current recorded in the first form; triggering verification when the difference is less than or equal to the threshold value associated with the trigger current.

[0014] Preferably, the on-site verification system applied to the single-phase electric energy metering device further comprises a compensation unit; when verification is triggered, the compensation unit controls the controllable load module to act so that the current flowing through the controllable load module is equal to the difference between the trigger current corresponding to the triggered verification and the monitored current.

[0015] The present application has the following advantages: the crimping needle is matched with the crimping hole arranged on the single-phase electric energy metering device to realize crimping, the locking nut is matched with the threaded hole arranged on the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device, the device main body and the single-phase electric energy metering device are buckled together, the clamp meter clamps the phase line, automatic verification is realized by monitoring the current, the staff only needs to buckle and leave the site, and then returns to the site to retrieve after the device is automatically verified, personnel efficiency and multi-point verification are considered, and the overall performance of the single-phase electric energy meter in its working range is verified.

[0016] Other features and advantages of the present application will be further described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The objectives and other advantages of the present application will be realized and achieved by the structure particularly pointed out in the written description and the appended drawings.

[0017] The technical solutions of the present application will be further described in detail below with reference to the drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a device for on-site verification of a single-phase power metering device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the device for on-site verification of a single-phase energy metering device in an embodiment of the present invention being connected to the single-phase energy metering device; Figure 3 This is a schematic diagram of a wired clamp meter in an embodiment of the present invention; Figure 4 This is a schematic diagram of a wireless clamp meter in an embodiment of the present invention; Figure 5 This is a schematic diagram of an on-site verification method for a single-phase power metering device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a field verification system for a single-phase power metering device according to an embodiment of the present invention.

[0019] In the picture: 1. Main body; 2. Display screen; 4. Crimping pin; 5. Locking nut; 6. Wired clamp meter; 7. Wireless clamp meter; 11. Detection unit; 12. Trigger judgment unit; 13. Verification unit; 14. Form update unit; 15. Completion prompt unit; 20. Single-phase power metering device; 21. Phase wire; 41. Voltage crimping pin; 42. Signal crimping pin. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example 1: This invention provides a device for on-site verification of single-phase energy metering devices, such as... Figures 1 to 4 As shown, it includes: a main body 1, a display screen 2, and a clamp meter; a crimping panel is provided on the lower end face of the main body 1; multiple crimping pins 4 are provided on the crimping panel, and the crimping pins 4 cooperate with the crimping holes configured on the single-phase power metering device to achieve crimping; there are two types of crimping pins, one of which is a voltage crimping pin 41 connected to the terminal of the phase line, and the other is a signal crimping pin 42 connected to the power pulse, 485, and second pulse. The locking nut 5 is arranged on the main body 1, and the locking nut 5 is arranged through the main body 1 from top to bottom, and the locking nut 5 is arranged in the threaded hole of the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device.

[0022] The current detection module, the voltage detection module, the communication module and the processing module are arranged in the main body; the processing module is electrically connected with the current detection module, the voltage detection module, the display screen and the communication module; The current detection module is used for detecting the current on the phase line 21 of the single-phase electric energy metering device 20 through the clamp-on ammeter; the voltage detection module is used for detecting the voltage on the phase line 21; the processing module is communicatively connected with the single-phase electric energy metering device through the communication module to obtain metering data, and based on the metering data, the voltage and the current, verification data is generated and displayed on the display screen.

[0023] The clamp-on ammeter includes a wired clamp-on ammeter 6 or a wireless clamp-on ammeter 7.

[0024] When the device is used as a field verification instrument, it is a high-precision field verification instrument; the voltage and current signals are sampled by the HT7017 (HT7028, etc.) and a high-speed 32-bit processor, and the electric parameters are calculated, and the average value and the rounding value of the error of the electric energy meter are directly calculated. The main functions and characteristics of the HT7017 chip are as follows: three-way 19-bit Sigma-Delta ADC; supporting 8000:1 dynamic range; can simultaneously obtain the active power and the reactive power of two-way calculation channels; supporting active, reactive, apparent power and active electric energy pulse output; can simultaneously obtain the effective value of three-way ADC channels and the frequency of the voltage channel; supporting UART communication mode; interrupt support: zero-crossing interrupt, sampling interrupt, electric energy pulse interrupt, and metering interrupt; power consumption is less than 4mA when running at NORMAL full speed; power supply monitoring function, supporting voltage sag (SAG) and peak detection (PEAK) function; supporting manganese copper drop firewire detection function; providing CRC verification of metering parameters; providing 128-point ADC waveform buffer function; the device adopts a buckle structure: fast installation, disassembly, and convenient field work. The specific field operation process is as follows: the instrument is aligned with the cover slot of the electric energy meter, horizontally pressed and screwed; then the wireless clamp-on ammeter switch is turned on (the wired clamp-on ammeter does not need to be turned on); the metering parameters are automatically set; verification is performed; data is stored; the instrument is turned off (verification is completed); and the instrument is removed. The communication module is adapted to the 645 or 698 protocol, and the information of the electric energy meter such as the electric energy meter constant, the active level, the power factor, the voltage, the current and the like can be read by using this function.

[0025] The embodiment also provides a field verification method applied to a single-phase electric energy metering device, which adopts the field verification device applied to the single-phase electric energy metering device, and the method comprises the following steps: After the device is connected to the single-phase electric energy metering device to be verified, the verification work is performed in a timing control mode or a current trigger control mode; The verification work performed in the timing control mode includes: performing data verification once every preset time interval.

[0026] In one specific application scenario of the on-site verification method of the embodiment, the matters to be completed by the staff are connecting the device to the single-phase electric energy metering device to be verified, triggering the start verification function button on the display screen after the installation is completed, and selecting the control module (timing control module or current trigger control module). When the timing control module is selected, the staff can take back the device at an appropriate time. When the current trigger control module is selected, the staff needs to wait until the device completes the verification and notifies the management platform. After the management platform sends the recycling task to the mobile terminal of the staff, the staff recycles the device.

[0027] As shown in Figure 5 The verification work performed in the current trigger control mode includes: Step one, obtaining the current detected by the current detection module; Step two, determining whether to trigger verification based on the first form and the current; Step three, when verification is triggered, obtaining the metering data by communicating with the single-phase electric energy metering device through the communication module, and generating verification data based on the metering data, the voltage, and the current; Step four, when the verification data is generated, deleting the corresponding current value in the first form; Step five, when the first form is empty, sending a verification completion prompt information to the management platform through the communication module.

[0028] The determination of whether to trigger verification based on the first form and the current includes: Calculating the difference between the current and each trigger current recorded in the first form; When the difference is less than or equal to the threshold value associated with the trigger current, verification is triggered.

[0029] The embodiment also provides an on-site verification system applied to a single-phase electric energy metering device, which adopts the device for on-site verification of the single-phase electric energy metering device described above and includes: A mode selection unit is configured to perform verification work in a timing control mode or a current trigger control mode after the device is connected to the single-phase electric energy metering device to be verified. The verification work performed in the timing control mode includes: performing data verification once every preset time interval.

[0030] As shown in Figure 6As shown, the on-site calibration system applied to the single-phase electric energy metering device further includes a detection unit 11, a trigger judgment unit 12, a calibration unit 13, a form updating unit 14, and a completion prompting unit 15; wherein the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger calibration based on the pre-configured first form and the current; when calibration is triggered, the calibration unit acquires the metering data through the communication module and the communication connection with the single-phase electric energy metering device, generates calibration data based on the metering data, voltage, and current; when the calibration data is generated, the form updating unit deletes the corresponding current value in the first form; when the first form is empty, the completion prompting unit sends a calibration completion prompt information to the management platform through the communication module.

[0031] The trigger judgment unit performs the following operations: Calculate the difference between the current and each trigger current recorded in the first form; When the difference is less than or equal to the threshold value associated with the trigger current, trigger calibration.

[0032] In actual calibration, each time the calibration is triggered, it is for a single current value in the first form; the entire calibration process needs to complete the calibration of all current values in the first form. Due to the uncontrollability of the current in the actual use process of the user, the entire calibration process may last for a long time. For calibration, the smaller the time span of the calibration process, the stronger the stability and reliability of the corresponding calibration data; therefore, it is necessary to evaluate the reliability of the calibration process. At this time, the on-site calibration system applied to the single-phase electric energy metering device further includes a calibration process evaluation module for evaluating the reliability of the calibration process; the calibration process evaluation module performs the following operations: taking the time corresponding to each trigger current, the calibration data, and the deviation of the metering data as evaluation data; performing feature extraction on the evaluation data to obtain a plurality of feature parameters; determining an evaluation value based on a pre-configured evaluation form and each feature parameter; when the evaluation value is greater than a pre-set first threshold value, the evaluation fails; when the evaluation fails, the first form is reset for re-calibration; wherein the feature parameters include: the maximum value of the difference in time, the average deviation, the maximum deviation, and the minimum deviation of the deviation of the calibration data and the metering data, etc.; the evaluation form is analyzed and constructed in advance, and the feature parameters and the evaluation value are correspondingly associated in the evaluation form. When constructing the evaluation form, the larger the maximum value of the difference in time, the larger the evaluation value; the larger the average deviation of the deviation of the calibration data and the metering data, the larger the evaluation value; the larger the maximum deviation of the deviation of the calibration data and the metering data, the larger the evaluation value; the larger the minimum deviation of the deviation of the calibration data and the metering data, the larger the evaluation value.

[0033] The resetting of the first form can be to add all the deleted current values back, therefore, a second form is configured to facilitate the re-adding; that is, the second form synchronously adds the deleted data into the second form when the first form deletes the current data therein; when resetting, the data in the second form is copied into the first form; although the all-adding mode is fast, it needs to re-perform the entire verification process, wasting verification time, and the first-deleted mode can be used for re-evaluation, guided by the second threshold value, to determine the data to be added to the first form; that is, the data in the evaluation data is sorted in time from front to back, and the first data is deleted in turn; when the evaluation value of the evaluation falls below the second threshold value, the current value corresponding to the deleted data is added to the first form; wherein the second threshold value is less than the first threshold value; the ratio of the second threshold value to the first threshold value can be any value in 0.6 to 0.9.

[0034] Embodiment 2: The embodiment of the application provides a device for on-site verification of a single-phase electric energy metering device, as shown in the drawings, comprising a main body, a display screen and a clamp meter; the lower end surface of the main body is provided with a crimping panel; a plurality of crimping needles are arranged on the crimping panel, and the crimping needles cooperate with the crimping holes arranged on the single-phase electric energy metering device to realize crimping; Figure 1 A locking nut is arranged on the main body, the locking nut is arranged through the main body from top to bottom, and the locking nut is arranged in the threaded hole arranged on the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device.

[0035] The main body is provided with a current detection module, a voltage detection module, a communication module and a processing module; wherein the processing module is electrically connected with the current detection module, the voltage detection module, the display screen and the communication module; The current detection module is used for detecting the current on the phase line of the single-phase electric energy metering device through the clamp meter; the voltage detection module is used for detecting the voltage on the phase line; the processing module is communicatively connected with the single-phase electric energy metering device through the communication module to obtain metering data, and based on the metering data, the voltage and the current, verification data is generated and displayed on the display screen.

[0036] The clamp meter comprises a wired clamp meter or a wireless clamp meter.

[0037] A controllable load module is further arranged in the main body; the controllable load module is electrically connected with the processing module. The controllable load module provides current compensation for the standard verification point, so that the verification of the single-phase electric energy metering device is at the standard point, and the verification data formed is more convenient to view and traceable.

[0038] ​In addition, a temperature and humidity sensor can be arranged in the main body to detect the ambient temperature and humidity, and a photoelectric sampler can be arranged to collect the display on the single-phase electric energy meter. In the case that the pulse terminal of the electric energy meter is damaged, the photoelectric sampler is connected to the corresponding connection terminal of the main body through a wire harness and is connected to the processing module through the connection terminal.

[0039] The embodiment also provides a field verification method applied to a single-phase electric energy metering device, which adopts the device for field verification applied to the single-phase electric energy metering device. After the device is connected to the single-phase electric energy metering device to be verified, the verification work is performed in a timing control mode or a current trigger control mode. The verification work in the timing control mode includes: performing data verification once every preset time interval.

[0040] The verification work in the current trigger control mode includes: The current detected by the current detection module is obtained. Based on the first form and the current, it is determined whether to trigger verification. When the verification is triggered, the metering data is obtained through the communication module and the single-phase electric energy metering device, and the verification data is generated based on the metering data, the voltage and the current. When the verification data is generated, the corresponding current value in the first form is deleted. When the first form is empty, the verification completion prompt information is sent to the management platform through the communication module.

[0041] Based on the first form and the current, it is determined whether to trigger verification, including: The difference between the current and each trigger current recorded in the first form is calculated. When the difference is less than or equal to the threshold value associated with the trigger current, the verification is triggered.

[0042] In addition, the field verification method applied to the single-phase electric energy metering device also includes: When the verification is triggered, the controllable load module is controlled to act so that the current flowing through the controllable load module is equal to the difference between the trigger current corresponding to the triggered verification and the monitored current.

[0043] The embodiment also provides a field verification system applied to a single-phase electric energy metering device, which adopts the device for field verification applied to the single-phase electric energy metering device, and includes: a mode selection unit, which is used to perform verification work in a timing control mode or a current trigger control mode after the device is connected to the single-phase electric energy metering device to be verified. The verification work in the timing control mode includes: performing data verification once every preset time interval.

[0044] The on-site calibration system applied to the single-phase electric energy metering device further comprises a detection unit, a trigger judgment unit, a calibration unit, a form updating unit and a completion prompting unit; the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger calibration based on the pre-configured first form and the current; when the calibration is triggered, the calibration unit acquires the metering data through the communication module and the single-phase electric energy metering device, generates calibration data based on the metering data, the voltage and the current; when the calibration data is generated, the form updating unit deletes the corresponding current value in the first form; when the first form is empty, the completion prompting unit sends a calibration completion prompting information to the management platform through the communication module.

[0045] The trigger judgment unit performs the following operations: calculating the difference between the current and each trigger current recorded in the first form; when the difference is less than or equal to the threshold value associated with the trigger current, triggering the calibration.

[0046] In addition, the on-site calibration system applied to the single-phase electric energy metering device further comprises a compensation unit; when the calibration is triggered, the compensation unit controls the controllable load module to act so that the current flowing through the controllable load module is equal to the difference between the trigger current corresponding to the triggered calibration and the monitored current.

[0047] In actual verification, each time the verification is triggered for a single current value in the first form; the entire verification process needs to complete the verification of all current values in the first form. Due to the uncontrollability of the current in the actual use process of the user, the entire verification process may last for a long time. For verification, the smaller the time span of the verification process, the stronger the stability and reliability of the corresponding verification data; therefore, the reliability of the verification process needs to be evaluated. At this time, the on-site verification system applied to the single-phase electric energy metering device further includes a verification process evaluation module for evaluating the reliability of the verification process. The verification process evaluation module performs the following operations: taking the time corresponding to each trigger current, the verification data and the deviation of the metering data as evaluation data; performing feature extraction on the evaluation data to obtain a plurality of feature parameters; determining an evaluation value based on a pre-evaluation table and each feature parameter; when the evaluation value is greater than a preset first threshold value, the evaluation fails; when the evaluation fails, the first form is reset for re-verification; wherein the feature parameters include: the maximum value of the time difference, the average deviation, the maximum deviation and the minimum deviation of the deviation of the verification data and the metering data; the evaluation table is constructed in advance. In the evaluation table, the feature parameters and the evaluation value are correspondingly associated. When constructing the evaluation table, the greater the maximum value of the time difference, the greater the evaluation value; the greater the average deviation of the deviation of the verification data and the metering data, the greater the evaluation value; the greater the maximum deviation of the deviation of the verification data and the metering data, the greater the evaluation value; the greater the minimum deviation of the deviation of the verification data and the metering data, the greater the evaluation value.

[0048] The reset of the first form can be to add all the deleted current values back. Therefore, in order to facilitate re-addition, a second form is configured; that is, the second form synchronously adds the deleted data to the second form for temporary storage when the first form deletes the current data therein; when resetting, the data in the second form is copied into the first form; although the all-add method is fast, it needs to perform the entire verification process again, wasting verification time. The first-deleted method can be used for re-evaluation, guided by a second threshold value to determine the data that needs to be added to the first form; that is, the data is sorted in the evaluation data from front to back according to time, and the first data is deleted in turn; when the evaluation value of the evaluation falls below the second threshold value, the current value corresponding to the deleted data is added to the first form; wherein the second threshold value is less than the first threshold value; the ratio of the second threshold value to the first threshold value can be any value between 0.6 and 0.9.

[0049] The reset check after the evaluation belongs to the post-processing, in order to ensure the efficiency of the check, the pre-processing needs to be realized, that is, by adjusting the check process, it is ensured that the evaluation can pass, a retest parameter (time amount) can be configured for the current value in the second form; that is, when the current value enters the second form, the retest parameter starts to decrease from the initial value, when it reaches zero, the current value is re-added to the first form, at this time, it is judged that the end of the check process cannot pass whether the first form is empty, the end parameter (the initial value of each data is zero) should be configured; the data number in the end parameter is equal to the number of the first form and one-to-one correspondence, when the corresponding data in the first form is deleted, the corresponding data in the end parameter is added by one; when the value of each data in the intermediate parameter is greater than or equal to one, the check process ends.

[0050] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A device for on-site verification of single-phase electricity metering devices, characterized in that, include: The main body, display screen, and clamp meter are included. A crimping panel is provided on the lower end face of the main body. Multiple crimping pins are provided on the crimping panel, and the crimping pins cooperate with the crimping holes configured on the single-phase power metering device to achieve crimping. A locking nut is provided on the main body, which runs through the main body from top to bottom. The locking nut and the threaded hole on the single-phase electricity metering device fix the main body to the single-phase electricity metering device.

2. The device for on-site verification of single-phase energy metering devices as described in claim 1, characterized in that, The main body is equipped with a current detection module, a voltage detection module, a communication module, and a processing module; the processing module is electrically connected to the current detection module, the voltage detection module, the display screen, and the communication module. The current detection module is used to detect the current on the phase line of the single-phase energy metering device using a clamp meter; the voltage detection module is used to detect the voltage on the phase line; the processing module communicates with the single-phase energy metering device through the communication module to obtain metering data, and generates verification data based on the metering data, voltage and current, and displays it on the display screen.

3. The device for on-site verification of single-phase energy metering devices as described in claim 1, characterized in that, Clamp meters include wired clamp meters or wireless clamp meters.

4. The device for on-site verification of single-phase energy metering devices as described in claim 1, characterized in that, A controllable load module is also configured inside the main body; the controllable load module is electrically connected to the processing module.

5. A field verification method for single-phase energy metering devices, characterized in that, The apparatus for on-site verification of single-phase energy metering devices as described in any one of claims 1 to 4 comprises: After the device is connected to the single-phase energy metering device to be calibrated, the calibration work is carried out using either timed control mode or current-triggered control mode. The verification process using a timed control mode includes verifying the data once every preset time interval.

6. The on-site verification method for single-phase energy metering devices as described in claim 5, characterized in that, The verification process using current-triggered control mode includes: Obtain the current detected by the current detection module; Based on the pre-configured first form and current, determine whether to trigger verification; When verification is triggered, the device communicates with the single-phase energy metering device through the communication module to obtain metering data, and generates verification data based on the metering data, voltage and current. Once the verification data is generated, delete the corresponding current value from the first form; When the first form is empty, a verification completion message is sent to the management platform via the communication module.

7. The on-site verification method for single-phase energy metering devices as described in claim 6, characterized in that, Based on the pre-configured first form and current, determine whether to trigger verification, including: Calculate the difference between the current and the various trigger currents recorded in the first form; When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

8. The on-site verification method for single-phase energy metering devices as described in claim 6, characterized in that, Also includes: When the verification is triggered, the controllable load module is controlled to operate so that the current flowing through the controllable load module is equal to the difference between the trigger current corresponding to the verification and the monitored current.

9. A field verification system for single-phase energy metering devices, characterized in that, The apparatus for on-site verification of single-phase energy metering devices as described in any one of claims 1 to 4 comprises: The mode selection unit is used to perform the verification work in either timed control mode or current-triggered control mode after the device is connected to the single-phase energy metering device to be verified. The verification process using a timed control mode includes verifying the data once every preset time interval.

10. The field verification system for single-phase energy metering devices as described in claim 9, characterized in that, Also includes: The system includes a detection unit, a trigger judgment unit, a validation unit, a form update unit, and a completion prompt unit. When the current-triggered control mode is used for verification, the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger the verification based on the pre-configured first form and the current. When verification is triggered, the verification unit communicates with the single-phase energy metering device through the communication module to obtain metering data, and generates verification data based on the metering data, voltage and current. After the verification data is generated, the form update unit deletes the corresponding current value from the first form; when the first form is empty, the completion prompt unit sends a verification completion prompt message to the management platform through the communication module.

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