Device, method and system for on-site calibration of single-phase electric energy metering devices

Abstract

This invention provides an apparatus, method, and system for on-site verification of single-phase energy metering devices, relating to the field of metering device verification technology. The apparatus includes: a main body, a display screen, and a clamp meter; a crimping panel is provided on the lower end face of the main body; multiple crimping pins are provided on the crimping panel, which engage with crimping holes on the single-phase energy metering device to achieve crimping; a locking nut is provided on the main body, extending from top to bottom through the main body, and the locking nut engages with threaded holes on the single-phase energy metering device to fix the main body to the single-phase energy metering device. This invention allows the main body of the device to be fastened to the single-phase energy metering device, enabling personnel to leave the site after fastening and return to retrieve it after the device has automatically completed its verification. This achieves a balance between personnel efficiency and multi-point verification, thereby enabling the verification of the overall performance of the single-phase energy meter within its operating range.

Description

Technical Field

[0001] This invention relates to the field of metering device calibration technology, and in particular to a device, method and system for on-site calibration of single-phase power metering devices. Background Technology

[0002] Single-phase energy metering devices, also known as single-phase energy meters, are metering devices used to measure the active energy consumption of a 220V single-phase AC circuit. They are widely used in residential, small commercial, and agricultural electricity consumption scenarios. Their core function is to convert the electrical energy consumed by the load into an intuitive kilowatt-hour (kWh) value, supporting both mechanical and electronic metering methods. Electronic metering uses chips such as the ADE7755, which calculates instantaneous power through voltage / current sampling and multiplication, and then accumulates pulses to achieve energy measurement. It supports multi-rate billing and remote meter reading, making it suitable for individual household metering in residential areas and energy consumption monitoring in commercial shops, especially adaptable to the peak-valley electricity pricing requirements of smart grids. Due to considerations of ensuring metering fairness and supporting smart grid regulation, the verification of single-phase energy metering devices is a rigid requirement. Existing single-phase energy metering device verification devices enable on-site verification of single-phase energy meters, which is performed by personnel connecting the device. When the power consumption of a single-phase energy meter load is uncertain, in order to take into account personnel efficiency, it is usually only possible to verify the single-phase energy meter under the current load operation condition. Multi-point verification is not possible, and the overall performance of the single-phase energy meter within its working range cannot be verified. Summary of the Invention

[0003] One of the objectives of this invention is to provide an apparatus, method, and system for on-site verification of single-phase power metering devices, in order to solve the aforementioned technical problems.

[0004] This invention provides a device for on-site verification of a single-phase energy metering device, comprising: a main body, a display screen, and a clamp meter; a crimping panel is provided on the lower end face of the main body; a plurality of crimping pins are provided on the crimping panel, and the crimping pins cooperate with the crimping holes configured on the single-phase energy metering device to achieve crimping;

[0005] 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.

[0006] Preferably, the main body is equipped with a current detection module, a voltage detection module, a communication module, and a processing module; wherein the processing module is electrically connected to the current detection module, the voltage detection module, the display screen, and the communication module;

[0007] 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.

[0008] Preferably, the clamp meter includes a wired clamp meter or a wireless clamp meter.

[0009] Preferably, a controllable load module is also configured within the main body; the controllable load module is electrically connected to the processing module.

[0010] The present invention also provides a field verification method for single-phase energy metering devices, employing any of the above-mentioned devices for field verification of single-phase energy metering devices, comprising:

[0011] 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.

[0012] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0013] Preferably, the verification work using the current-triggered control mode includes:

[0014] Obtain the current detected by the current detection module;

[0015] Based on the pre-configured first form and current, determine whether to trigger verification;

[0016] 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.

[0017] Once the verification data is generated, delete the corresponding current value from the first form;

[0018] When the first form is empty, a verification completion message is sent to the management platform via the communication module.

[0019] Preferably, based on a pre-configured first form and current, determining whether to trigger verification includes:

[0020] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0021] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0022] Preferably, the on-site verification method for single-phase energy metering devices further includes:

[0023] 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.

[0024] The present invention also provides a field verification system for single-phase energy metering devices, employing any of the above-mentioned devices for field verification of single-phase energy metering devices, comprising:

[0025] 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.

[0026] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0027] Preferably, the on-site verification system for single-phase energy metering devices further includes: a detection unit, a trigger judgment unit, a verification unit, a form update unit, and a completion prompt unit; wherein, the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger verification based on a 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 acquire 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.

[0028] Preferably, the triggering judgment unit performs the following operation:

[0029] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0030] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0031] Preferably, the field verification system for single-phase power metering devices further includes: a compensation unit; when verification is triggered, the compensation unit controls the controllable load module 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.

[0032] The present invention has the following advantages: The crimping pin engages with the crimping hole on the single-phase energy metering device to achieve crimping; the locking nut engages with the threaded hole on the single-phase energy metering device to fix the main body onto the single-phase energy metering device, thus fastening the main body of the device to the single-phase energy metering device together. The clamp meter clamps the phase wire, and automatic verification is achieved by monitoring the current. Workers only need to complete the fastening process and can leave the site. After the device has completed its automatic verification, they can return to retrieve it. This achieves a balance between personnel efficiency and multi-point verification, thereby enabling the verification of the overall performance of the single-phase energy meter within its operating range.

[0033] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0035] 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:

[0036] 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;

[0037] 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;

[0038] Figure 3 This is a schematic diagram of a wired clamp meter in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a wireless clamp meter in an embodiment of the present invention;

[0040] 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;

[0041] 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.

[0042] In the picture:

[0043] 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

[0044] 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.

[0045] Example 1:

[0046] 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.

[0047] A locking nut 5 is provided on the main body 1. The locking nut 5 is provided through the main body 1 from top to bottom. The locking nut 5 and the threaded hole configured on the single-phase power metering device fix the main body on the single-phase power metering device.

[0048] 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.

[0049] The current detection module is used to detect the current on the phase line 21 of the single-phase energy metering device 20 using a clamp meter; the voltage detection module is used to detect the voltage on the phase line 21; 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.

[0050] Clamp meters include: wired clamp meter 6 or wireless clamp meter 7.

[0051] When used as a field calibrator, this device is a high-precision field calibrator. It samples voltage and current signals through the HT7017 (HT7028, etc.) and a high-speed 32-bit processor, calculates electrical parameters, and directly calculates the average value and rounded value of the energy meter error. The main functions and features of the HT7017 chip include: three 19-bit Sigma-Delta ADCs; support for a dynamic range of 8000:1; simultaneous acquisition of active and reactive power from two calculation channels; support for active, reactive, apparent power, and active energy pulse output; simultaneous acquisition of the effective values ​​of three ADC channels and the frequency of the voltage channel; support for UART communication; interrupt support for zero-crossing interrupt, sampling interrupt, energy pulse interrupt, and calibration interrupt; power consumption less than 4mA at full speed in NORMAL mode; power monitoring function, supporting voltage dip (SAG) and peak detection (PEAK) functions; support for manganese copper wire failure detection; CRC verification of calibration parameters; 128-point ADC waveform buffering function; the device adopts a snap-on structure for quick installation and disassembly, facilitating on-site work. Specific on-site operation procedure: Align the instrument with the energy meter cover slot, horizontally press and tighten the screws → turn on the wireless clamp meter switch (not required with wired clamps) → read the meter to automatically set the test parameters → calibrate → store data → turn off the instrument (calibration complete) → remove the instrument. The communication module is compatible with the 645 or 698 protocol, and this function can be used to read information from the electricity meter, such as the electricity meter constant, active power level, power factor, voltage, current and other information.

[0052] This embodiment also provides a field verification method for single-phase energy metering devices, using the aforementioned field verification device for single-phase energy metering devices, including:

[0053] 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.

[0054] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0055] In a specific application scenario of the on-site verification method in this embodiment, the tasks that the staff needs to complete are to connect the device to the single-phase energy metering device to be verified, trigger the start verification function button on the display screen after installation, and select the control module (timed control module or current trigger control mode); when using the timed control module, the staff can retrieve the device at an appropriate time; when using the current trigger control module, the staff needs to wait until the device verification is completed and notify the management platform. After the management platform sends a retrieval task to the staff's mobile terminal, the staff will retrieve the device.

[0056] like Figure 5As shown, the verification process using the current-triggered control mode includes:

[0057] Step 1: Obtain the current detected by the current detection module;

[0058] Step 2: Based on the pre-configured first form and current, determine whether to trigger verification;

[0059] Step 3: When the verification is triggered, the metering data is obtained by communicating with the single-phase power metering device through the communication module. Based on the metering data, voltage and current, verification data is generated.

[0060] Step 4: After the verification data is generated, delete the corresponding current value in the first form;

[0061] Step 5: When the first form is empty, send a verification completion message to the management platform through the communication module.

[0062] Among them, determining whether to trigger verification based on the pre-configured first form and current includes:

[0063] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0064] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0065] This embodiment also provides a field verification system for single-phase energy metering devices, employing the aforementioned field verification device for single-phase energy metering devices, comprising:

[0066] 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.

[0067] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0068] like Figure 6 As shown, the on-site verification system for single-phase energy metering devices further includes: a detection unit 11, a trigger judgment unit 12, a verification unit 13, a form update unit 14, and a completion prompt unit 15. The detection unit acquires the current detected by the current detection module. The trigger judgment unit determines whether to trigger verification based on a pre-configured first form and the current. When verification is triggered, the verification unit communicates with the single-phase energy metering device via a communication module to acquire 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 via the communication module.

[0069] The triggering judgment unit performs the following operations:

[0070] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0071] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0072] In actual verification, each trigger verification targets a single current value in the first form. The entire verification process requires verifying all current values ​​in the first form. Due to the uncontrollable nature of current during actual user operation, the entire verification process may take a considerable amount of time. For verification, the shorter the time span of the verification process, the stronger the stability and reliability of the verification data. Therefore, a reliability assessment of the verification process is required. The field verification system applied to single-phase energy metering devices also includes a verification process assessment module for reliability evaluation. The verification process assessment module performs the following operations: using the time corresponding to each trigger current, the deviation between the verification data and the metering data as assessment data; extracting features from the assessment data to obtain multiple feature parameters; determining the assessment value based on a pre-defined assessment table and each feature parameter; failing the assessment when the assessment value exceeds a preset first threshold; resetting the first form for re-verification when the assessment fails; the feature parameters include: the maximum value of the time difference, the average deviation, maximum deviation, and minimum deviation between the verification data and the metering data, etc.; the assessment table is pre-analyzed and constructed, with feature parameters and assessment values ​​corresponding to each other in the assessment table. When constructing the evaluation table, the larger the maximum value of the time difference, the larger the evaluation value; the larger the average deviation between the verification data and the measurement data, the larger the evaluation value; the larger the maximum deviation between the verification data and the measurement data, the larger the evaluation value; and the larger the minimum deviation between the verification data and the measurement data, the larger the evaluation value.

[0073] Resetting the first form can involve re-adding all deleted current values. Therefore, to facilitate this re-addition, a second form is configured. When current data is deleted from the first form, the deleted data is simultaneously added to the second form for temporary storage. During reset, the data from the second form is copied into the first form. While adding all data is quick, it requires re-performing the entire validation process, wasting validation time. A better approach is to re-evaluate by deleting the first value, using a second threshold as a guide to determine the data to be added to the first form. This involves sorting the evaluation data chronologically and deleting the first value sequentially. When the evaluated value drops to the second threshold, the current value corresponding to the deleted data is added to the first form. The second threshold is less than the first threshold; the ratio of the second threshold to the first threshold can be any value between 0.6 and 0.9.

[0074] Example 2:

[0075] This invention provides a device for on-site verification of single-phase energy metering devices, such as... Figure 1 As shown, it includes: a main body, a display screen, and a clamp meter; 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;

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Clamp meters include wired clamp meters and wireless clamp meters.

[0080] The main unit also includes a controllable load module, which is electrically connected to the processing module. The controllable load module provides current compensation for standardized verification points, ensuring that the verification of the single-phase energy metering device is performed at standardized points, making the generated verification data easier to view and trace.

[0081] In addition, a temperature and humidity sensor can be built into the main body to detect the ambient temperature and humidity; and a photoelectric sampler can be configured to collect data from the display on the single-phase electricity meter. This can be applied when the pulse terminal of the electricity meter is damaged. The photoelectric sampler is connected to the corresponding connection terminal on the main body through a wire harness and then connected to the processing module through the connection terminal.

[0082] This embodiment also provides a field verification method for single-phase energy metering devices, using the aforementioned field verification device for single-phase energy metering devices, including:

[0083] 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.

[0084] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0085] The verification process using current-triggered control mode includes:

[0086] Obtain the current detected by the current detection module;

[0087] Based on the pre-configured first form and current, determine whether to trigger verification;

[0088] 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.

[0089] Once the verification data is generated, delete the corresponding current value from the first form;

[0090] When the first form is empty, a verification completion message is sent to the management platform via the communication module.

[0091] Among them, determining whether to trigger verification based on the pre-configured first form and current includes:

[0092] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0093] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0094] In addition, the on-site verification methods applied to single-phase energy metering devices also include:

[0095] 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.

[0096] This embodiment also provides an on-site verification system for single-phase energy metering devices. The device used for on-site verification of single-phase energy metering devices includes: a mode selection unit, used to perform verification work by using a timed control mode or a current-triggered control mode after the device is connected to the single-phase energy metering device to be verified.

[0097] The verification process using a timed control mode includes verifying the data once every preset time interval.

[0098] The on-site verification system for single-phase energy metering devices also includes: a detection unit, a trigger judgment unit, a verification unit, a form update unit, and a completion prompt unit. The detection unit acquires the current detected by the current detection module. The trigger judgment unit determines whether to trigger verification based on a pre-configured first form and the current. When verification is triggered, the verification unit communicates with the single-phase energy metering device via a communication module to acquire 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 via the communication module.

[0099] The triggering judgment unit performs the following operations:

[0100] Calculate the difference between the current and the various trigger currents recorded in the first form;

[0101] When the difference is less than or equal to the threshold associated with the trigger current, a check is triggered.

[0102] In addition, the field verification system for single-phase power metering devices also includes: a compensation unit; when verification is triggered, the compensation unit controls the controllable load module to make the current flowing through the controllable load module equal to the difference between the trigger current corresponding to the verification and the monitored current.

[0103] In actual verification, each trigger verification targets a single current value in the first form. The entire verification process requires verifying all current values ​​in the first form. Due to the uncontrollable nature of current during actual user operation, the entire verification process may take a considerable amount of time. For verification, the shorter the time span of the verification process, the stronger the stability and reliability of the verification data. Therefore, a reliability assessment of the verification process is required. The field verification system applied to single-phase energy metering devices also includes a verification process assessment module for reliability evaluation. The verification process assessment module performs the following operations: using the time corresponding to each trigger current, the deviation between the verification data and the metering data as assessment data; extracting features from the assessment data to obtain multiple feature parameters; determining the assessment value based on a pre-defined assessment table and each feature parameter; failing the assessment when the assessment value exceeds a preset first threshold; resetting the first form for re-verification when the assessment fails; the feature parameters include: the maximum value of the time difference, the average deviation, maximum deviation, and minimum deviation between the verification data and the metering data, etc.; the assessment table is pre-analyzed and constructed, with feature parameters and assessment values ​​corresponding to each other in the assessment table. When constructing the evaluation table, the larger the maximum value of the time difference, the larger the evaluation value; the larger the average deviation between the verification data and the measurement data, the larger the evaluation value; the larger the maximum deviation between the verification data and the measurement data, the larger the evaluation value; and the larger the minimum deviation between the verification data and the measurement data, the larger the evaluation value.

[0104] Resetting the first form can involve re-adding all deleted current values. Therefore, to facilitate this re-addition, a second form is configured. When current data is deleted from the first form, the deleted data is simultaneously added to the second form for temporary storage. During reset, the data from the second form is copied into the first form. While adding all data is quick, it requires re-performing the entire validation process, wasting validation time. A better approach is to re-evaluate by deleting the first value, using a second threshold as a guide to determine the data to be added to the first form. This involves sorting the evaluation data chronologically and deleting the first value sequentially. When the evaluated value drops to the second threshold, the current value corresponding to the deleted data is added to the first form. The second threshold is less than the first threshold; the ratio of the second threshold to the first threshold can be any value between 0.6 and 0.9.

[0105] Resetting the verification after evaluation is a post-event process. To ensure verification efficiency, pre-event processing is necessary. This involves adjusting the verification process to guarantee the evaluation passes. A retest parameter (time value) can be configured for the current values ​​in the second form. When the current value enters the second form, the retest parameter decreases from its initial value. When it reaches zero, the current value is added back to the first form. At this point, the end of the verification process cannot be determined by whether the first form is empty; an end parameter (with each data point initially set to zero) should be configured. The number of data points in the end parameter must be equal to and correspond one-to-one with the number of data points in the first form. When the corresponding data in the first form is deleted, the value of the corresponding data point in the end parameter is incremented by one. The verification process ends when all data points in the interleukin parameter are greater than or equal to one.

[0106] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for field verification applied to a single-phase electric energy metering device, characterized by, The device for on-site calibration applied to single-phase electric energy metering device comprises: After the device is connected to the single-phase electric energy metering device to be calibrated, the calibration work is carried out in a timing control mode or a current trigger control mode; The calibration work in the timing control mode comprises: data calibration is carried out once every preset time interval; The calibration work in the current trigger control mode comprises: The current detected by the current detection module is obtained; Based on the first form and the current, it is determined whether to trigger calibration; When the calibration is triggered, the metering data is obtained through the communication module and the single-phase electric energy metering device, and the calibration data is generated based on the metering data, the voltage and the current; After the calibration data is generated, the corresponding current value in the first form is deleted; When the first form is empty, the calibration completion prompt information is sent to the management platform through the communication module; Based on the first form and the current, it is determined whether to trigger calibration, which comprises: 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 calibration is triggered; The device for on-site calibration applied to single-phase electric energy metering device comprises: The lower end surface of the main body is provided with a crimping panel; 2. The field verification method for single phase electric energy metering installation as claimed in claim 1 wherein, 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, and 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.

3. The method for field verification of single phase electric energy metering installation as claimed in claim 1 wherein, 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; 4. The method for field verification of single phase electric energy metering installation as claimed in claim 1 wherein, The current detection module is used to detect the current on the phase line of the single-phase electric energy metering device through the clamp meter; the voltage detection module is used to detect the voltage on the phase line; the processing module obtains the metering data through the communication module and the single-phase electric energy metering device, generates the calibration data based on the metering data, the voltage and the current, and displays the calibration data on the display screen.

5. The method for field verification of single phase electric energy metering installation as claimed in claim 1 wherein, The clamp meter comprises a wired clamp meter or a wireless clamp meter. A controllable load module is further arranged in the main body and is electrically connected with the processing module.

6. A field verification system for single-phase energy metering devices, characterized in that, When the calibration 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 calibration and the monitored current. The device for on-site calibration applied to single-phase electric energy metering device comprises: A mode selection unit is used to carry out calibration 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 calibrated; The calibration work in the timing control mode comprises: data calibration is carried out once every preset time interval; Further comprising: a detection unit, a trigger judgment unit, a verification unit, a form updating unit and a completion prompting unit; when the verification work is carried out in the current trigger control mode, the detection unit acquires the current detected by the current detection module; the trigger judgment unit determines whether to trigger verification based on the first form and the current; when triggering verification, the verification unit acquires the measurement data through the communication module and the communication connection with the single-phase electric energy metering device, and generates verification data based on the measurement data, voltage and 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 prompt information to the management platform through the communication module; 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 verification; The device for on-site verification of single-phase electric energy metering device comprises a main body, a display screen and a clamp-on ammeter. 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 hole arranged on the single-phase electric energy metering device to fix the main body on the single-phase electric energy metering device.

7. The field verification system for use in single phase electrical energy metering installations as claimed in claim 6 wherein, 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 to detect the current on the phase line of the single-phase electric energy metering device through the clamp-on ammeter. The voltage detection module is used to detect the voltage on the phase line. The processing module acquires the measurement data through the communication module and the communication connection with the single-phase electric energy metering device, generates verification data based on the measurement data, voltage and current, and displays the verification data on the display screen.

8. The field verification system for use in single phase electrical energy metering installations as claimed in claim 6 wherein, The clamp-on ammeter includes a wired clamp-on ammeter or a wireless clamp-on ammeter.

9. The field verification system for use in single phase electrical energy metering installations as claimed in claim 6 wherein, A controllable load module is further arranged in the main body and is electrically connected with the processing module.

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