Error adjusting method of three-phase electric energy meter, electric energy meter and electric energy meter calibrating device

Abstract

The invention provides an error adjustment method of a three-phase electric energy meter, and relates to the technical field of electric energy meter correction, each electric energy meter to be adjusted is hung on each meter position of an electric energy meter calibrating device in a crimping manner, and the method comprises the following steps: receiving a wiring check instruction issued by the electric energy meter calibrating device, and obtaining first sampling data of the electric energy meter calibrating device; determining whether the current to-be-adjusted electric energy meter is abnormal or not, and determining whether the current meter position and the electric energy meter calibrating device are abnormal or not; when it is determined that no abnormity exists, receiving a sampling command issued by the electric energy meter calibrating device; after a sampling command is received, obtaining N groups of second sampling data according to a preset sampling period; receiving third sampling data output by the current meter position and issued by the electric energy meter calibrating device; and determining a meter calibration value according to the second sampling data and the third sampling data, and carrying out electric energy meter calibration operation. According to the scheme, the adjustment qualification rate of the electric energy meter can be improved, and the situation that the production efficiency is affected by repeated adjustment due to meter correction failure is reduced.

Description

Technical Field

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

[0002] Error calibration methods for three-phase electricity meters generally include pulse calibration and power calibration. The pulse calibration method requires separate calibration of phases A, B, C, and C, and multiple calibration points for each phase, which is time-consuming overall. Therefore, power calibration is generally used during production calibration. Compared to the pulse calibration method, the power calibration method can calibrate all three phases simultaneously. During calibration, the system only needs to transmit voltage, current, active power, and reactive power, and all calibration processes are completed by the meter itself. However, the power calibration method places higher demands on the calibration platform, requiring a high degree of stability to ensure the accuracy of the data transmitted to the meter.

[0003] In practice, three-phase energy meters have numerous wiring terminals, especially those with CT connections. Poor contact at any terminal can lead to calibration failure, especially with the traditional crimp connection method. Screw fastening is laborious and requires repeated screwing for both mounting and dismounting, making it unsuitable for batch calibration.

[0004] While the crimping method is more efficient, its calibration pass rate is also high. Based on actual production data, for a 40-meter three-phase calibration station, the average pass rate for calibration using the crimping method followed by error verification on the station itself was 87.5%. The average pass rate after error testing on an error test station was 98%, resulting in an overall pass rate of 82.5% for a single calibration. This means that an average of seven meters failed during a single calibration. Hardware issues are generally rare, perhaps only one or two. The remaining meters typically failed calibration due to poor contact or station instability. These failed meters generally passed calibration after recalibration. Therefore, existing solutions for batch calibration of energy meters have a low calibration pass rate, and repeated calibration significantly impacts production efficiency. Summary of the Invention

[0005] In view of this, in order to address the above shortcomings, it is necessary to propose an error calibration method for a three-phase electric energy meter, an electric energy meter and an electric energy meter calibration device to improve the calibration pass rate of the electric energy meter and reduce the occurrence of situations where repeated calibration due to calibration failure affects production efficiency.

[0006] In a first aspect, the present invention provides a method for calibrating an error of a three-phase electric energy meter. Each electric energy meter to be calibrated is mounted on a meter position of an electric energy meter calibration device in a crimped manner. The error calibration method is applied to any electric energy meter to be calibrated, comprising:

[0007] receiving a wiring check instruction issued by the electric energy meter verification device and obtaining its own first sampling data; determining whether the electric energy meter to be calibrated currently has an abnormality based on the first sampling data and status information output by the meter position where the electric energy meter to be calibrated currently is located; and determining whether the current meter position and the electric energy meter verification device have an abnormality based on an output jump of the meter position where the electric energy meter to be calibrated currently is located;

[0008] When it is determined that there is no abnormality in the current electric energy meter to be calibrated, the current meter position and the electric energy meter verification device, feeding back normal inspection information to the electric energy meter verification device and receiving a sampling command issued by the electric energy meter verification device;

[0009] After receiving the sampling command, obtain N sets of second sampling data according to the preset sampling period; N is an integer not less than 3;

[0010] Receive the third sampling data outputted by the electric energy meter calibration device at the meter position where the electric energy meter to be calibrated is located; wherein the first sampling data, the second sampling data and the third sampling data all include: voltage, current, active power and reactive power;

[0011] A meter calibration value is determined according to the second sampling data and the third sampling data, and an electric energy meter calibration operation is performed.

[0012] Preferably, determining whether the electric energy meter to be calibrated currently has an abnormality according to the first sampling data and the status information output by the meter position where the electric energy meter to be calibrated currently is located includes:

[0013] Determining whether the first sampling data is within the state output by the meter position where the electric energy meter to be calibrated is located;

[0014] If so, the voltage, current, active power and reactive power in the first sampling data are compared with the deviation values ​​of the three phases A, B and C respectively, and the abnormal phase is determined according to the difference, and the voltage, current, active power and reactive power corresponding to the abnormal phase are cyclically displayed on the current electric energy meter to be adjusted;

[0015] If not, the sampling data of the three phases A, B, and C are traversed, and the voltage, current, active power, and reactive power of the abnormal phase are cyclically displayed on the electric energy meter currently to be adjusted.

[0016] Preferably, comparing the deviation values ​​of the three phases A, B, and C and determining the abnormal phase according to the difference includes:

[0017] For each of the voltage, current, active power and reactive power parameters, perform:

[0018] Calculate the first relative deviation of phase B relative to phase A;

[0019] If the first relative deviation is greater than the preset deviation threshold and phase B shows no abnormality, it is determined that phase A has an abnormality; if the first relative deviation is greater than the deviation threshold and phase B shows an abnormality, it is determined that phase B has an abnormality;

[0020] If the first relative deviation is not greater than a preset deviation threshold, calculating a second relative deviation of phase C relative to phase A;

[0021] If the second relative deviation is greater than the preset deviation threshold, it is determined that there is an abnormality in phase C; if the second relative deviation is not greater than the preset deviation threshold, it is determined that phases A, B, and C are all normal.

[0022] Preferably, the determining whether there is an abnormality in the current position and the electric energy meter verification device according to the output jump of the current position where the electric energy meter to be calibrated is located includes:

[0023] Collect the data storage capacity of the internal active power register according to the preset period;

[0024] When the data storage capacity is greater than 3, sort the stored active power data to get the maximum value S max , minimum value S min and the median value S m ;

[0025] Using ε 上 =(S max -S m ) / S m and ε 下 =(S m -S min ) / S m , calculate the upper limit of the jump of the current epitope ε 上 and the lower limit of the jump ε 下 ;

[0026] According to the jump upper limit ε 上 and the lower limit of the jump ε 下 , determine whether the output jump of the current meter position is within the preset reasonable jump range; if not, it is determined that there is an abnormality in the current meter position or the electric energy meter calibration device.

[0027] Preferably, when there is an abnormality in the electric energy meter to be calibrated, or an abnormality in the current meter position, or an abnormality in the electric energy meter calibration device, the backlight flashes according to a preset cycle and an alarm is sounded through a buzzer.

[0028] Preferably, before determining the calibration value based on the second sampling data and the third sampling data, the second sampling data and the third sampling data are both screened through the following steps:

[0029] For each of the voltage, current, active power and reactive power parameters, perform:

[0030] Sort the current parameters in N groups of data and determine the median value;

[0031] For each set of data, calculate the third relative deviation of the current parameter relative to the median value;

[0032] Eliminate data whose third relative deviation is outside the preset relative deviation range from the N groups of data;

[0033] Calculate the average value of each data that has not been eliminated, and determine the average value as the sampling data used to determine the calibration value under the current parameters.

[0034] In a second aspect, the present invention provides a method for calibrating an error of a three-phase electric energy meter. Each electric energy meter to be calibrated is mounted on a respective meter position of an electric energy meter calibration device in a crimped manner. The error calibration method is applied to the electric energy meter calibration device, comprising:

[0035] Sending a wiring check instruction to each electric energy meter to be adjusted, so that each electric energy meter to be adjusted can determine whether there is any abnormality in the electric energy meter to be adjusted, and whether there is any abnormality in the current meter position and the electric energy meter verification device;

[0036] Receive feedback from each electric energy meter to be adjusted in real time;

[0037] Upon receiving the normal inspection information fed back by each electric energy meter to be calibrated, a sampling command is issued to each electric energy meter to be calibrated, and the third sampling data output by the meter is collected at the same time;

[0038] The third sampling data output by each meter position is sent to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated determines the calibration value in combination with the second sampling data collected, and performs the electric energy meter calibration operation.

[0039] Preferably, after the adjustment operation of the electric energy meter to be adjusted is completed, the method further includes:

[0040] Read the voltage, current, active power and reactive power of the calibrated electric energy meter and compare the error with the output values ​​of the corresponding meter position collected by the meter.

[0041] If the error value is within the preset allowable error range, the calibration is completed; otherwise, the calibration operation is repeated n times; where n is an integer not less than 2.

[0042] In a third aspect, the present invention provides an electric energy meter, comprising: a wiring check module, a sampling command receiving module, a sampling data acquisition module, a sampling data receiving module, and a calibration module;

[0043] The wiring check module is configured to receive a wiring check instruction issued by the electric energy meter verification device and obtain its own first sampling data; determine whether the electric energy meter to be calibrated currently has an abnormality based on the first sampling data and status information output by the meter position where the electric energy meter to be calibrated currently is located; and determine whether the current meter position and the electric energy meter verification device have an abnormality based on the output jump of the meter position where the electric energy meter to be calibrated currently is located;

[0044] The sampling command receiving module is configured to feed back normal inspection information to the electric energy meter verification device when the wiring inspection module determines that there is no abnormality in the electric energy meter to be calibrated, the current meter position and the electric energy meter verification device, and receive the sampling command issued by the electric energy meter verification device;

[0045] The sampling data acquisition module is configured to acquire N sets of second sampling data according to a preset sampling period after the sampling command receiving module receives the sampling command; N is an integer not less than 3;

[0046] The sampling data receiving module is configured to receive the third sampling data output by the meter position of the electric energy meter to be calibrated, which is issued by the electric energy meter calibration device; wherein the first sampling data, the second sampling data and the third sampling data all include: voltage, current, active power and reactive power;

[0047] The adjustment module is configured to determine a calibration value based on the second sampling data acquired by the sampling data acquisition module and the third sampling data received by the sampling data receiving module, and perform an electric energy meter adjustment operation.

[0048] In a fourth aspect, the present invention provides an electric energy meter calibration device, comprising: a wiring check instruction issuing module, a feedback information receiving module, a sampling command issuing module, and a sampling data issuing module;

[0049] The wiring check instruction issuing module is configured to issue a wiring check instruction to each electric energy meter to be calibrated, so that each electric energy meter to be calibrated can determine whether there is an abnormality in the electric energy meter to be calibrated, and whether there is an abnormality in the current meter position and the electric energy meter verification device;

[0050] The feedback information receiving module is configured to receive feedback information from each electric energy meter to be calibrated in real time;

[0051] The sampling command issuing module is configured to issue a sampling command to each electric energy meter to be calibrated upon receiving the normal inspection information fed back by each electric energy meter to be calibrated, and simultaneously collect the third sampling data output by the meter;

[0052] The sampling data sending module is configured to send the third sampling data output by each meter position to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated can determine the calibration value in combination with the second sampling data collected by it and perform the electric energy meter calibration operation.

[0053] It can be seen from the above technical solution that when this solution is performing error adjustment on a three-phase electric energy meter, each electric energy meter to be adjusted is hung on each meter position of the electric energy meter calibration device in a crimped manner, and the electric energy meter calibration device first sends a wiring check instruction to each electric energy meter to be adjusted; and after receiving the wiring check instruction, the electric energy meter to be adjusted will check whether there is any abnormality in the current electric energy meter to be adjusted, and whether there is any abnormality in the current meter position or the electric energy meter calibration device. If there is no abnormality after the inspection, the electric energy meter calibration device will send a sampling command, and then the electric energy meter to be adjusted will perform the meter calibration operation. It can be seen that this solution can detect electric energy meter abnormalities, meter position abnormalities or electric energy meter calibration device abnormalities before the test through wiring verification, so as to avoid discovering problems after the error test is completed, which affects the calibration pass rate of the electric energy meter. At the same time, it also reduces the occurrence of repeated adjustments due to calibration failures, which is conducive to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A flowchart of an error adjustment method for a three-phase electric energy meter to be adjusted is provided in an embodiment of the present invention.

[0055] Figure 2 A flowchart of an error adjustment method for a three-phase electric energy meter applied to an electric energy meter calibration device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] The calibration time of a three-phase electric energy meter is generally about 50 minutes. Generally, before calibration, it is difficult for production personnel to find any abnormalities in the meter calibration device, meter position or electric energy meter. Usually, only after the calibration is completed can they know that there is a problem in a certain link through the results. This not only affects the calibration pass rate, but also causes a huge waste of personnel and time. In addition, the calibration time is too long and the calibration process is not transparent. Even if an abnormality occurs during the calibration, it is difficult for production personnel to locate the problem in the first time. It is time-consuming and laborious to troubleshoot the problem, which delays the production process and even causes production suspension, bringing huge losses to the company. Based on this, this solution proposes an error calibration method for a three-phase electric energy meter, an electric energy meter and an electric energy meter calibration device to solve the above problems. The error calibration method for a three-phase electric energy meter provided by the present invention can be mainly implemented by the electric energy meters to be calibrated and the electric energy meter calibration device. The following is an explanation of the implementation of the electric energy meter to be calibrated and the electric energy meter calibration device.

[0058] Firstly, the electric energy meter to be calibrated serves as the implementing entity.

[0059] like Figure 1 As shown, the present invention provides a method for error calibration of a three-phase electric energy meter. Each electric energy meter to be calibrated is mounted on each meter position of an electric energy meter calibration device in a crimping manner. The error calibration method is applied to any electric energy meter to be calibrated. The method comprises the following steps:

[0060] Step 101: Receive a wiring check instruction issued by an electric energy meter verification device and obtain its own first sampling data; determine whether the electric energy meter to be calibrated has an abnormality based on the first sampling data and the status information output by the meter position where the electric energy meter to be calibrated is located; and determine whether the current meter position and the electric energy meter verification device have an abnormality based on the output jump of the meter position where the electric energy meter to be calibrated is located;

[0061] Step 102: When it is determined that there is no abnormality in the current electric energy meter to be calibrated, the current meter position, and the electric energy meter verification device, feeding back normal inspection information to the electric energy meter verification device and receiving a sampling command issued by the electric energy meter verification device;

[0062] Step 103: After receiving the sampling command, obtain N sets of second sampling data according to a preset sampling period; N is an integer not less than 3;

[0063] Step 104: receiving the third sampling data outputted by the current electric energy meter to be calibrated, which is sent by the electric energy meter calibration device; wherein the first sampling data, the second sampling data, and the third sampling data all include: voltage, current, active power, and reactive power;

[0064] Step 105: Determine a calibration value based on the second sampling data and the third sampling data, and perform an electric energy meter calibration operation.

[0065] For step 101, after each electric energy meter to be calibrated is mounted on each meter position of the electric energy meter calibration device in a crimped manner, the electric energy meter calibration device will output the rated voltage, rated current, power factor 0.5L, etc., and then the electric energy meter calibration device will issue a wiring check instruction to each electric energy meter to be calibrated. Since the electric energy meter can generally control the initial error within a certain range through the default metering parameters, if the crimping is not good, resulting in poor contact or an abnormality in a phase sampling circuit, the data collected by the electric energy meter will deviate from the normal sampling value. Therefore, after receiving the wiring check instruction, the electric energy meter will collect its own first sampling data, which can then be used to determine whether there is an abnormality in the electric energy meter to be calibrated, as well as whether there is an abnormality in the current meter position and the electric energy meter calibration device.

[0066] (1) Specifically, when determining whether the electric energy meter to be calibrated has an abnormality, the following methods can be used to determine:

[0067] Determine whether the first sampling data is within the state output by the meter position where the electric energy meter to be calibrated is located;

[0068] If so, the voltage, current, active power and reactive power in the first sampling data are compared with the deviation values ​​of the three phases A, B and C respectively, and the abnormal phase is determined according to the difference, and the voltage, current, active power and reactive power corresponding to the abnormal phase are cyclically displayed on the current electric energy meter to be adjusted;

[0069] If not, the sampling data of the three phases A, B, and C are traversed, and the voltage, current, active power, and reactive power of the abnormal phase are cyclically displayed on the electric energy meter currently to be adjusted.

[0070] In this embodiment, after receiving the wiring check instruction, the electric energy meter determines whether it is in the state actually output by the electric energy meter calibration device through the voltage, current, active power and reactive power collected by itself, such as whether it meets the rated current test range corresponding to 0.5L. If the electric energy meter determines that the current state is consistent with the state output by the electric energy meter calibration device, it traverses the sampling data of the three phases ABC and displays the voltage, current, active power and reactive power of the abnormal phase on the LCD in a cycle of one second. If the state is normal, the relative deviations of phases A, B and C are compared respectively. In the general initial state, when the initial parameters of the three phases are consistent by default and the hardware is the same, the relative deviation should be within a certain range. If it exceeds this range, it proves that a phase has poor contact or the sampling circuit of the phase is abnormal. The electric energy meter LCD will display the voltage, current, active power and reactive power of the abnormal phase in a cycle of one second.

[0071] Specifically, when comparing the deviation values ​​of phases A, B, and C and determining the abnormal phase based on the difference, this can be achieved in the following way:

[0072] For each of the voltage, current, active power and reactive power parameters, perform:

[0073] Calculate the first relative deviation of phase B relative to phase A;

[0074] If the first relative deviation is greater than the preset deviation threshold, and it is determined by personnel inspection or other methods that phase B shows no abnormality, it is determined that phase A has an abnormality; if the first relative deviation is greater than the deviation threshold, and phase B shows an abnormality, it is determined that phase B has an abnormality;

[0075] If the first relative deviation is not greater than the preset deviation threshold, calculating the second relative deviation of phase C relative to phase A;

[0076] If the second relative deviation is greater than the preset deviation threshold, it is determined that there is an abnormality in phase C; if the second relative deviation is not greater than the preset deviation threshold, it is determined that phases A, B, and C are all normal.

[0077] In this embodiment, the phase in which the abnormality exists can be determined, so that the position and cause of the abnormality can be quickly located during subsequent maintenance, thereby improving the efficiency of the maintenance.

[0078] (2) When determining whether there is an abnormality in the current meter position and the meter calibration device based on the output jump of the meter position where the current meter to be calibrated is located, it can be achieved in the following ways:

[0079] Collect the data storage capacity of the internal active power register according to the preset period;

[0080] When the data storage capacity is greater than 3, sort the stored active power data to get the maximum value S max , minimum value S min and the median value S m ;

[0081] Using ε 上 =(S max -S m ) / S m and ε 下 =(S m -S min ) / S m , calculate the upper limit of the jump of the current epitope ε 上 and the lower limit of the jump ε 下 ;

[0082] According to the upper limit of the jump 上 and the lower limit of the jump ε 下 , determine whether the output jump of the current meter position is within the preset reasonable jump range; if not, it is determined that there is an abnormality in the current meter position or the electric energy meter calibration device.

[0083] In this embodiment, if the electric energy meter to be calibrated does not have any abnormality, it is further determined whether there is any abnormality in the meter position or the electric energy meter calibration device. Specifically, the electric energy meter to be calibrated can collect the data storage capacity of the current active power register every second. When the collected values ​​are greater than 3, all data are sorted using the bubble method to find the minimum value, maximum value and median value, and then use ε to calculate the value of the data. 上 =(S max -S m ) / S m and ε 下 =(S m -S min ) / S m Calculate the relative error of the maximum and minimum values ​​relative to the median value, which respectively reflect the upper and lower limits of the output jump. Under normal circumstances, the output jump of the energy meter verification device or meter position will be within a reasonable range. If it exceeds this range, it indicates that the jump is too large, and the energy meter verification device or meter position may be abnormal and unsuitable for error debugging.

[0084] Of course, it is possible to further determine whether the meter position or the meter calibration device is abnormal by determining whether a certain number of meter positions in the meter calibration device all experience excessive jumps. For example, if more than a certain number of meter positions experience excessive jumps, it is possible that the meter calibration device is abnormal. If only a few meter positions experience excessive jumps, it is possible that the corresponding meter position is abnormal.

[0085] When the above-mentioned abnormalities occur, in addition to the abnormal information displayed on the electricity meter's LCD, the meter's backlight will also flash at a one-second cycle, and a buzzer will sound an alarm. After hearing the audible alarm, the adjuster will first check which meter's LCD is flashing, and then use the LCD prompt information to determine which phase's sampling data has an abnormality. Then, the adjuster can check whether a phase of the meter has poor contact, or whether a sampling circuit of a phase of the meter is abnormal, or whether there is an abnormality between the meter's calibration device and the meter output. In this way, abnormal meters, abnormalities in the meter's calibration device, and abnormalities in the meter position can be identified before commissioning, avoiding the problem being discovered after the error test is completed, resulting in repeated commissioning and affecting production efficiency.

[0086] In step 102, after the meter to be calibrated passes the inspection, a normal message can be fed back to the meter calibration device, informing the meter calibration device that the wiring inspection has passed and there are no abnormalities. At this point, the meter calibration device will issue a sampling command to the meter to be calibrated, including the number of sampling times and error threshold. The meter calibration device initiates the calibration start command, and the meter initializes the relevant registers, preparing to begin a new calibration process.

[0087] In steps 103 and 104, after the meter calibration device issues a command, it synchronizes sampling with the meter. After reaching the specified sampling frequency, the meter calibration device sends its own sampled data to the corresponding meter. After receiving the third sampled data from the meter calibration device, the meter considers filtering the third sampled data and its own second sampled data to reduce the impact of abnormal data. The filtered data is then used to determine the calibration value.

[0088] Specifically, both the second sampled data and the third sampled data can be screened and processed by the following steps:

[0089] For each of the voltage, current, active power and reactive power parameters, perform:

[0090] Sort the current parameters in N groups of data and determine the median value;

[0091] For each set of data, calculate the third relative deviation of the current parameter relative to the median value;

[0092] Eliminate data whose third relative deviation is outside the preset relative deviation range from N groups of data;

[0093] Calculate the average value of each data that has not been eliminated, and determine the average value as the sampling data used to determine the calibration value under the current parameters.

[0094] In this embodiment, for one meter position, the electric energy meter and the electric energy meter verification device collect a set of data per second, and a total of 30 sets of data are collected. Each set of data includes voltage, current, active power and reactive power. Assume that S1 to S 30 , slightly sort all the sample data by the bubble method and find the median value S m , and then use the formula |(S x -S m )| / S m Calculate the error percentage of each group of data relative to the median value one by one. Assuming the error threshold is 0.4%, the data with a percentage greater than 0.4% will be directly discarded, and the data with a percentage not greater than 0.4% will be included in the average value calculation. Through this screening method, the influence of abnormal large or small values ​​on the average value can be eliminated. In theory, even if the voltage and current of the electric energy meter calibration device have a short-term drop or rise during the sampling process, it will not affect the test results. Therefore, it is generally difficult to keep the sampling time axis of the electric energy meter calibration device and the electric energy meter consistent during the sampling process. In this way, even if the electric energy meter calibration device collects data first or the electric energy meter collects data first, it will not have any effect. It is only necessary to ensure that the electric energy meter calibration device remains stable during most of the sampling time, which reduces the requirements for the stability of the electric energy meter calibration device.

[0095] Furthermore, the sampling frequency and error limits for filtered data can be configured through communication based on the specific meter type. For general 1.0-level meters, no data needs to be sent, and the meter can use the default data, such as 30 sampling times, a voltage error limit of 0.4%, a current error limit of 0.5%, an active power error limit of 0.1%, and a reactive power error limit of 0.1%. However, for 0.5S and 0.2S-level meters, higher requirements are placed on the calibration results. Using the default data for calibration is likely to result in an excessively high test failure rate, especially when the meter calibration device jumps significantly. In this case, the meter calibration device system can issue new sampling times and error limits through commands. For example, for a 0.5S-level meter, the sampling frequency can be increased to 50, and for a 0.2S meter, the sampling frequency can be increased to 100. By extending the sampling time and using algorithm filtering, the impact of meter calibration device jumps on error calibration can be eliminated.

[0096] In step 105, after the second sampling data and the third sampling data are obtained through screening, the corresponding calibration value can be determined by difference comparison, and then the error calibration test of the electric energy meter to be calibrated can be completed by performing a calibration operation.

[0097] Secondly, the electricity meter calibration device serves as the implementing body.

[0098] like Figure 2 As shown, the present invention provides a method for error adjustment of a three-phase electric energy meter. Each electric energy meter to be adjusted is mounted on each meter position of an electric energy meter calibration device in a crimping manner. The error adjustment method is applied to the electric energy meter calibration device. The method includes the following steps:

[0099] Step 201: issuing a wiring check instruction to each electric energy meter to be calibrated, so that each electric energy meter to be calibrated can determine whether there is any abnormality in the electric energy meter to be calibrated, and whether there is any abnormality in the current meter position and the electric energy meter calibration device;

[0100] Step 202: Receive feedback information from each energy meter to be calibrated in real time;

[0101] Step 203: upon receiving the normal inspection information fed back by each electric energy meter to be calibrated, a sampling command is issued to each electric energy meter to be calibrated, and the third sampling data outputted by the meter is collected at the same time;

[0102] Step 204: Send the third sampling data output by each meter position to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated determines the calibration value in combination with the second sampling data collected, and performs the electric energy meter calibration operation.

[0103] In this embodiment, after issuing a sampling command to the energy meter to be calibrated, step 203 performs data sampling synchronously with the energy meter after a 2-second delay. The third sampled data obtained from the sampling can be sent to the corresponding energy meter for screening and processing. In one embodiment, the energy meter calibration device can screen and process the third sampled data before sending it to the corresponding energy meter, thereby reducing the processing load of the energy meter and improving the calibration efficiency of the energy meter.

[0104] In addition, after the calibration operation of the electric energy meter to be calibrated is completed, the voltage, current, active power and reactive power of the calibrated electric energy meter can be further read and compared with the values ​​output by the corresponding meter positions collected by itself; if the error value is within the preset allowable error range, the calibration is completed; otherwise, the calibration operation is repeated n times; where n is an integer not less than 2.

[0105] The present invention also provides an electric energy meter, comprising: a wiring check module, a sampling command receiving module, a sampling data acquisition module, a sampling data receiving module and a calibration module;

[0106] The wiring check module is configured to receive a wiring check instruction issued by the electric energy meter verification device and obtain its own first sampling data; determine whether the electric energy meter to be calibrated currently has an abnormality based on the first sampling data and status information output by the meter position where the electric energy meter to be calibrated currently is located; and determine whether the current meter position and the electric energy meter verification device have an abnormality based on the output jump of the meter position where the electric energy meter to be calibrated currently is located;

[0107] a sampling command receiving module configured to, when the wiring inspection module determines that there is no abnormality in the current electric energy meter to be calibrated, the current meter position, and the electric energy meter verification device, feed back normal inspection information to the electric energy meter verification device and receive a sampling command issued by the electric energy meter verification device;

[0108] The sampling data acquisition module is configured to acquire N sets of second sampling data according to a preset sampling period after the sampling command receiving module receives the sampling command; N is an integer not less than 3;

[0109] The sampling data receiving module is configured to receive the third sampling data output by the meter position of the electric energy meter to be calibrated, which is sent by the electric energy meter calibration device; wherein the first sampling data, the second sampling data and the third sampling data all include: voltage, current, active power and reactive power;

[0110] The adjustment module is configured to determine the meter calibration value according to the second sampling data obtained by the sampling data acquisition module and the third sampling data received by the sampling data receiving module, and perform an adjustment operation on the electric energy meter.

[0111] In one embodiment, the present invention further provides an electric energy meter calibration device, comprising: a wiring check instruction issuing module, a feedback information receiving module, a sampling command issuing module, and a sampling data issuing module;

[0112] a wiring check instruction issuing module configured to issue a wiring check instruction to each electric energy meter to be calibrated, so that each electric energy meter to be calibrated can determine whether there is an abnormality in the electric energy meter to be calibrated, and whether there is an abnormality in the current meter position and the electric energy meter verification device;

[0113] A feedback information receiving module configured to receive feedback information from each electric energy meter to be calibrated in real time;

[0114] The sampling command issuing module is configured to issue a sampling command to each electric energy meter to be calibrated upon receiving the normal inspection information fed back by each electric energy meter to be calibrated, and simultaneously collect the third sampling data output by the meter;

[0115] The sampling data sending module is configured to send the third sampling data output by each meter position to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated can determine the calibration value in combination with the second sampling data collected by it and perform the electric energy meter calibration operation.

[0116] This specification also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed in a computer, the computer is caused to execute the method in any one of the embodiments in the specification.

[0117] This specification also provides a computing device, including a memory and a processor, wherein the memory stores executable code, and when the processor executes the executable code, the method in any one of the embodiments in the specification is implemented.

[0118] Since the device embodiments provided by the present invention are based on the same inventive concept as the method embodiments of this specification, the specific contents can be found in the description of the method embodiments of this specification and will not be repeated here.

[0119] The modules or units in the apparatus of the embodiments of the present invention may be combined, divided, or deleted as needed. The above disclosure is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Persons skilled in the art will appreciate that any equivalent variations made by implementing all or part of the processes of the above embodiments in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for error adjustment of a three-phase electric energy meter, characterized in that: Each electric energy meter to be calibrated is mounted on each meter position of the electric energy meter calibration device in a crimping manner. The error calibration method is applied to any electric energy meter to be calibrated, and includes: Receive the wiring check instruction issued by the electric energy meter verification device, and obtain its own first sampling data; determine whether the electric energy meter to be calibrated currently has an abnormality according to the first sampling data and the status information output by the table position where the electric energy meter to be calibrated currently is located; and determine whether the current table position and the electric energy meter verification device have an abnormality according to the output jump of the table position where the electric energy meter to be calibrated currently is located; When it is determined that there is no abnormality in the electric energy meter to be calibrated, the current meter position and the electric energy meter verification device, feedback normal inspection information to the electric energy meter verification device, and receive a sampling command issued by the electric energy meter verification device; After receiving the sampling command, N groups of second sampling data are obtained according to a preset sampling period; N is an integer not less than 3; Receive the third sampling data outputted by the meter position of the electric energy meter to be calibrated issued by the electric energy meter verification device; wherein the first sampling data, the second sampling data and the third sampling data all include: voltage, current, active power and reactive power; A calibration value is determined according to the second sampling data and the third sampling data, and an electric energy meter calibration operation is performed.

2. The error adjustment method of the three-phase electric energy meter according to claim 1, characterized in that: The determining whether the electric energy meter to be calibrated currently has an abnormality according to the first sampling data and the status information output by the meter position where the electric energy meter to be calibrated currently is located includes: Determine whether the first sampling data is within the state output by the meter position where the electric energy meter to be calibrated is located; If yes, then compare the deviation values ​​of the three phases A, B, and C respectively for the voltage, current, active power, and reactive power in the first sampling data, and determine the abnormal phase according to the difference, and cyclically display the voltage, current, active power, and reactive power corresponding to the abnormal phase on the current electric energy meter to be adjusted; If not, the sampling data of the three phases A, B, and C are traversed, and the voltage, current, active power, and reactive power of the abnormal phase are cyclically displayed on the electric energy meter currently to be adjusted.

3. The error adjustment method of the three-phase electric energy meter according to claim 2, characterized in that: The comparing the deviation values ​​of the three phases A, B, and C and determining the abnormal phase according to the difference includes: For each of the voltage, current, active power and reactive power, perform: Calculate the first relative deviation of phase B relative to phase A; If the first relative deviation is greater than the preset deviation threshold, and phase B shows no abnormality, it is determined that phase A has an abnormality; if the first relative deviation is greater than the deviation threshold, and phase B shows an abnormality, it is determined that phase B has an abnormality; If the first relative deviation is not greater than a preset deviation threshold, calculating a second relative deviation of phase C relative to phase A; If the second relative deviation is greater than the preset deviation threshold, it is determined that phase C is abnormal; if the second relative deviation is not greater than the preset deviation threshold, it is determined that phases A, B, and C are all normal.

4. The error adjustment method of the three-phase electric energy meter according to claim 3, characterized in that: The method of determining whether there are abnormalities in the current meter position and the electric energy meter verification device according to the output jump of the meter position where the electric energy meter to be calibrated is located includes: Collect the data storage amount of the internal active power register according to the preset period; When the data storage capacity is greater than 3, sort the stored active power data to obtain the maximum value S max , minimum value S min and the median value S m ; Using ε 上 =(S max -S m ) / S m and ε 下 =(S m -S min ) / S m , calculate the upper limit of the jump of the current epitope ε 上 and the lower limit of the transition ε 下 ; According to the jump upper limit ε 上 and the lower limit of the transition ε 下 , determine whether the output jump of the current meter position is within the preset reasonable jump range; if not, it is determined that there is an abnormality in the current meter position or the electric energy meter calibration device.

5. The error adjustment method of the three-phase electric energy meter according to claim 3, characterized in that: When there is an abnormality in the electric energy meter to be calibrated, or in the current meter position, or in the electric energy meter calibration device, the backlight flashes according to a preset cycle and an alarm is sounded through a buzzer.

6. The error adjustment method of the three-phase electric energy meter according to claim 1, characterized in that: Before determining the calibration value according to the second sampling data and the third sampling data, the second sampling data and the third sampling data are both screened and processed by the following steps: For each of the voltage, current, active power and reactive power parameters, perform: Sort the current parameters in N groups of data and determine the median value; For each set of data, the third relative deviation of the current parameter relative to the median value is calculated; Eliminate the data whose third relative deviation is outside the preset relative deviation range in the N groups of data; Calculate the average value of each data that has not been eliminated, and determine the average value as the sampling data used to determine the calibration value under the current parameters.

7. A method for error adjustment of a three-phase electric energy meter, characterized in that: Each electric energy meter to be calibrated is mounted on each meter position of the electric energy meter calibration device in a crimping manner. The error calibration method is applied to the electric energy meter calibration device, and includes: Sending a wiring check instruction to each electric energy meter to be calibrated, so that each electric energy meter to be calibrated can determine whether there is an abnormality in the electric energy meter to be calibrated, and whether there is an abnormality in the current meter position and the electric energy meter verification device; Receive feedback information from each electric energy meter to be calibrated in real time; When receiving the normal inspection information fed back by each electric energy meter to be calibrated, a sampling command is issued to each electric energy meter to be calibrated, and the third sampling data output by the meter is collected at the same time; The third sampling data outputted by each meter position is sent to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated determines the calibration value in combination with the second sampling data collected, and performs the electric energy meter calibration operation.

8. The error adjustment method of the three-phase electric energy meter according to claim 7, characterized in that: After the adjustment operation of the electric energy meter to be adjusted is completed, the method further includes: Read the voltage, current, active power and reactive power of the calibrated electric energy meter, and compare the errors with the values ​​output by the corresponding meter positions collected by the user. If the error value is within the preset allowable error range, the calibration is completed; otherwise, the calibration operation is repeated n times; where n is an integer not less than 2.

9. An electric energy meter, characterized in that: include: Wiring check module, sampling command receiving module, sampling data acquisition module, sampling data receiving module and adjustment module; The wiring check module is configured to receive a wiring check instruction issued by the electric energy meter verification device and obtain its own first sampling data; determine whether the electric energy meter to be calibrated currently has an abnormality according to the first sampling data and the status information output by the meter position where the electric energy meter to be calibrated currently is located; And, according to the output jump of the meter position where the electric energy meter to be calibrated is located, determine whether there is an abnormality in the current meter position and the electric energy meter calibration device; The sampling command receiving module is configured to feedback normal inspection information to the electric energy meter verification device and receive the sampling command issued by the electric energy meter verification device when the wiring inspection module determines that there is no abnormality in the current electric energy meter to be calibrated, the current meter position and the electric energy meter verification device; The sampling data acquisition module is configured to acquire N groups of second sampling data according to a preset sampling period after the sampling command receiving module receives the sampling command; N is an integer not less than 3; The sampling data receiving module is configured to receive the third sampling data outputted by the electric energy meter verification device at the meter position where the electric energy meter to be calibrated is located; wherein the first sampling data, the second sampling data and the third sampling data all include: voltage, current, active power and reactive power; The adjustment module is configured to determine the calibration value according to the second sampling data acquired by the sampling data acquisition module and the third sampling data received by the sampling data receiving module, and perform an electric energy meter adjustment operation.

10. An electric energy meter calibration device, characterized in that: include: Wiring check instruction sending module, feedback information receiving module, sampling command sending module and sampling data sending module; The wiring check instruction issuing module is configured to issue a wiring check instruction to each electric energy meter to be calibrated, so that each electric energy meter to be calibrated determines whether the electric energy meter to be calibrated has an abnormality, and determines whether the current meter position and the electric energy meter verification device have an abnormality; The feedback information receiving module is configured to receive feedback information from each electric energy meter to be calibrated in real time; The sampling command issuing module is configured to issue a sampling command to each electric energy meter to be calibrated upon receiving the normal inspection information fed back by each electric energy meter to be calibrated, and simultaneously collect the third sampling data output by the meter; The sampling data sending module is configured to send the third sampling data output by each meter position to the corresponding electric energy meter to be calibrated, so that the corresponding electric energy meter to be calibrated can determine the calibration value in combination with the second sampling data collected by it and perform the electric energy meter calibration operation.

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