Error detection system and method of electric energy meter and electronic equipment

Abstract

The invention provides an error detection system and method of an electric energy meter and electronic equipment. The error detection system comprises at least one sampling channel, a signal source output module, an error instrument and a signal reference module, the error instrument and the signal source output model are respectively connected with an external electric energy meter to be tested; the signal source output module is used for acquiring a test parameter corresponding to each test point in the test file and sending the test parameters to the to-be-tested electric energy meter, the signal reference module and the error instrument; the signal reference module is used for generating a reference signal according to the test parameters and sending the reference signal to the error instrument; the sampling channel is used for receiving a pulse signal sent by the to-be-tested electric energy meter and sending the pulse signal to the error instrument; and the error instrument is used for calculating error data between each pulse signal and the reference signal according to the pulse turns, the error sampling number and a preset error calculation method. And multiple error types can be synchronously detected, so that the test efficiency is remarkably improved, and the measurement result is more comprehensive and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy meter error detection, and in particular to an electric energy meter error detection system, method and electronic equipment. Background Art

[0002] The error detection of electric energy meters is an important part of ensuring the accuracy of electric energy meter measurement, which mainly includes the detection of active energy error, reactive energy error and clock daily timing error. Most of the existing error detection methods of electric energy meters adopt single-type sampling and single-channel testing, that is, various types of errors are measured in turn through a single error meter and a single sampling channel (such as electrical pulses, optical pulses or Bluetooth pulses), and the measurement of different types of errors is controlled by switching the processor. Although the channel and error type can be switched in different measurement processes, each test can only process one error type and one sampling channel. This test method has problems such as low efficiency, high measurement uncertainty, and poor measurement synchronization. Summary of the invention

[0003] In view of this, an object of the present invention is to provide an error detection system, method and electronic device for an electric energy meter, which can simultaneously detect multiple error types, so that the test efficiency is significantly improved and the measurement results are more comprehensive and accurate.

[0004] In the first aspect, an embodiment of the present invention provides an error detection system for an electric energy meter, comprising: at least one sampling channel, a signal source output module, an error meter and a signal reference module; the signal source output module is connected to the error meter and the signal reference module respectively; the error meter is connected to an external electric energy meter to be tested through the sampling channel; the signal source output module is connected to the electric energy meter to be tested; the signal source output module is used to obtain the test parameters corresponding to each test point in the test file, and send the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to a test parameter; the test parameters include the number of pulse cycles and the number of error samples; the signal reference module is used to generate a reference signal according to the test parameters, and send the reference signal to the error meter; the sampling channel is used to receive the pulse signal sent by the electric energy meter to be tested, and send the pulse signal to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; the error meter is used to calculate the error data between each pulse signal and the reference signal according to the number of pulse cycles, the number of error samples and a preset error calculation method.

[0005] Furthermore, the sampling channel includes an electric pulse sampling channel and / or an optical pulse sampling channel and / or a Bluetooth pulse sampling channel; each sampling channel is respectively connected to a sampling port of the electric energy meter to be tested; the signal types of the pulse signal include electric pulse signals, optical pulse signals and Bluetooth pulse signals; the sampling channel is also used to receive electric pulse signals and / or optical pulse signals and / or Bluetooth pulse signals sent by the electric energy meter to be tested; the electric pulse signals, optical pulse signals and Bluetooth pulse signals are all low-frequency pulse signals.

[0006] Furthermore, the signal reference module includes a standard table and a clock; the reference signal includes a reference standard table signal and a reference clock signal; the reference standard table signal is a high-frequency pulse signal; the standard table is used to output the corresponding reference standard table signal according to the test parameters; the reference standard table signal includes an active pulse signal and a reactive pulse signal; the clock is used to output the corresponding reference clock signal according to the test parameters.

[0007] Furthermore, the error meter includes a pulse signal acquisition unit; the pulse signal acquisition unit is used to obtain the test parameters sent by the signal source output module; obtain the pulse signal sent by the sampling channel, and when the number of pulse signals in the uncalculated error state is the same as the number of pulse circles, obtain the current reference standard table signal corresponding to the standard table.

[0008] Furthermore, the error meter also includes an error calculation unit; the pulse signal acquisition unit is connected to the error calculation unit; the error data includes an original error value, a maximum error value and an average error value; the pulse signal acquisition unit is also used to send each pulse signal and the current reference standard table signal to the error calculation unit; the error calculation unit is used to calculate the original error value between each pulse signal and the current reference standard table signal based on a preset error calculation method; based on the preset error calculation method and each original error value, the maximum error value and the average error value corresponding to the test point are calculated; when the number of original error values ​​reaches the number of error samples, a test point test completion signal is sent to the pulse signal acquisition unit and the signal source output module to stop the pulse signal acquisition unit and enable the signal source output module to send the test parameters corresponding to the next test point.

[0009] Furthermore, the signal source output module includes a signal generator, a voltage output unit, a current output unit and a timing unit; the signal generator is respectively connected to the error meter, the voltage output unit, the current output unit, the timing unit, the standard meter and the clock; the timing unit is used to obtain the current test time of the error detection system of the electric energy meter; the signal source output module is also used to obtain the current test time when each test point is in a test completion state; determine whether the current test time is greater than or equal to a preset test period; if not, retest each test point.

[0010] Furthermore, the error detection system of the electric energy meter also includes a report generation module; the report generation module is connected to the error meter; the report generation module is used to generate an error detection report according to the error data corresponding to each sampling channel sent by the error meter.

[0011] In the second aspect, an embodiment of the present invention provides an error detection method for an electric energy meter, which is applied to the error detection system of the electric energy meter of any of the above items, and the method includes: obtaining the test parameters corresponding to each test point in the test file through a signal source output module, and sending the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to a test parameter; the test parameters include the number of pulse cycles and the number of error sampling; generating a reference signal according to the test parameters through the signal reference module, and sending the reference signal to the error meter; receiving the pulse signal sent by the electric energy meter to be tested through a sampling channel, and sending the pulse signal to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; calculating the error data between each pulse signal and the reference signal through the error meter according to the number of pulse cycles, the number of error sampling and a preset error calculation method.

[0012] In a third aspect, an embodiment of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method described above when executing the computer program.

[0013] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the program code enables the processor to execute the method as described above.

[0014] The embodiment of the present invention provides an error detection system, method and electronic device for an electric energy meter, comprising: at least one sampling channel, a signal source output module, an error meter and a signal reference module; the signal source output module is connected to the error meter and the signal reference module respectively; the error meter is connected to the electric energy meter to be tested of the peripheral device through the sampling channel; the signal source output module is connected to the electric energy meter to be tested; the signal source output module is used to obtain the test parameters corresponding to each test point in the test file, and send the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to a test parameter; the test parameters include the number of pulse turns and the number of error samples; the signal reference module is used to generate a reference signal according to the test parameters and send the reference signal to the error meter; the sampling channel is used to receive the pulse signal sent by the electric energy meter to be tested, and send the pulse signal to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; the error meter is used to calculate the error data between each pulse signal and the reference signal according to the number of pulse turns, the number of error samples and the preset error calculation method. In this way, multiple error types can be detected synchronously, so that the test efficiency is significantly improved, and the measurement results are more comprehensive and accurate.

[0015] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of an error detection system for an electric energy meter provided in Embodiment 1 of the present invention;

[0019] Figure 2 A schematic diagram of an error detection system for another electric energy meter provided in Embodiment 1 of the present invention;

[0020] Figure 3 A schematic diagram of a high-frequency pulse signal and a low-frequency pulse signal provided in Embodiment 1 of the present invention;

[0021] Figure 4A circuit diagram of an error meter provided in Embodiment 1 of the present invention;

[0022] Figure 5 A schematic diagram of a test flow provided in Embodiment 1 of the present invention;

[0023] Figure 6 A schematic diagram of standard electric energy meter constants provided in the first embodiment of the present invention;

[0024] Figure 7 This is a flow chart of an error detection method for an electric energy meter provided in Embodiment 2 of the present invention.

[0025] Icons: 1-Signal source output module; 2-Error meter; 3-Signal reference module; 4-Electric energy meter to be tested; 5-Sampling channel; 6-Report generation module; 11-Signal generator; 12-Voltage output unit; 13-Current output unit; 14-Timing unit; 21-Pulse signal acquisition unit; 22-Error calculation unit; 51-Electric pulse sampling channel; 52-Optical pulse sampling channel; 53-Bluetooth pulse sampling channel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0028] Embodiment 1:

[0029] Figure 1 A schematic diagram of an error detection system for an electric energy meter provided in Embodiment 1 of the present invention.

[0030] Reference Figure 1 The error detection system of the electric energy meter includes: at least one sampling channel 5, a signal source output module 1, an error meter 2 and a signal reference module 3; the signal source output module 1 is connected to the error meter 2 and the signal reference module 3 respectively; the error meter 2 is connected to the external electric energy meter 4 to be tested through the sampling channel 5; the signal source output module 1 is connected to the electric energy meter 4 to be tested.

[0031] The signal source output module 1 is used to obtain the test parameters corresponding to each test point in the test file, and send the test parameters to the electric energy meter 4 to be tested, the signal reference module 3 and the error meter 2; each test point corresponds to a test parameter; the test parameters include the number of pulse cycles and the number of error samples.

[0032] Here, the signal source output module 1 reads the test parameters corresponding to each test point according to the preset test file, and the test parameters define the measurement conditions of each test point. After reading, the signal source output module 1 sends the test parameters to the electric energy meter 4 to be tested, the signal reference module 3 and the error meter 2, so that the electric energy meter 4 to be tested, the signal reference module 3 and the error meter 2 perform the test according to the same parameters.

[0033] Each test point defines specific test conditions, and the test is finely controlled through test parameters, including current parameters, voltage parameters, number of pulses, and number of error samples.

[0034] The number of pulse turns indicates the number of pulses that need to be accumulated before each error calculation. For example, when the number of pulse turns is 3, it means that 1 error is calculated after 3 pulses are collected.

[0035] The number of error sampling indicates how many error values ​​need to be collected at each test point. For example, when the number of error sampling is 3, it means that after sampling 3 errors at the same test point, the next test point test will be performed.

[0036] Furthermore, the test file also includes at least one test scheme, each test scheme includes a load parameter, at least one test point and a test parameter corresponding to each test point. Each test scheme is executed respectively in a preset order.

[0037] Specifically, the test scheme may include an inductive load stability test, a capacitive load stability test, and an overload test.

[0038] When the test scheme is an inductive load stability test, the electric energy meter 4 to be tested is connected to a preset inductive load based on the load parameters.

[0039] When the test scheme is a capacitive load stability test, the electric energy meter 4 to be tested is connected to a preset capacitive load based on the load parameters.

[0040] When the test scheme is an overload test, the electric energy meter 4 to be tested is connected to a preset overload load based on the load parameters.

[0041] The signal reference module 3 is used to generate a reference signal according to the test parameters and send the reference signal to the error meter 2.

[0042] Here, the signal reference module 3 generates a standard signal based on the test parameters as a reference for error calculation. The reference signal may include a standard meter signal and a clock signal, providing a stable comparison reference so that the error meter 2 can accurately calculate the measurement deviation of the electric energy meter 4 to be tested.

[0043] In one embodiment, referring to Figure 2The signal reference module 3 includes a standard meter and a clock meter; the reference signal includes a reference standard meter signal and a reference clock signal; the reference Figure 3 , the reference standard table signal is a high-frequency pulse signal.

[0044] The standard meter is used to output corresponding reference standard meter signals according to the test parameters; the reference standard meter signals include active pulse signals and reactive pulse signals.

[0045] The clock meter is used to output a corresponding reference clock signal according to the test parameters.

[0046] The sampling channel 5 is used to receive the pulse signal sent by the electric energy meter 4 to be tested, and send the pulse signal to the error meter 2; wherein the signal type of the pulse signal received by each sampling channel 5 is different.

[0047] Here, the sampling channel 5 is responsible for receiving the output signals of the electric energy meter 4 to be tested, which can be different types of pulses (such as electrical pulses, optical pulses and Bluetooth pulses). The sampling channel 5 ensures that various types of signals are collected synchronously and transmitted to the error meter 2, supporting multi-channel and multi-type error detection.

[0048] Each sampling channel 5 is configured with an independent storage space. When the number of pulse sampling reaches the set number of cycles, the reference standard table signal is immediately frozen in a snapshot manner to ensure the measurement error of each channel is accurate and achieve timeliness and accuracy of sampling.

[0049] After obtaining the first error, a waiting mechanism is used to ensure the synchronization of the errors of each sampling channel 5, and a clearing pulse storage counter is used to enable each channel to collect the second error at the same time, and so on, to avoid error deviation caused by pulse delay and achieve timely sampling.

[0050] In one embodiment, the sampling channel 5 includes an electric pulse sampling channel 51 and / or an optical pulse sampling channel 52 and / or a Bluetooth pulse sampling channel 53; each sampling channel 5 is respectively connected to a sampling port of the electric energy meter 4 to be tested; the signal type of the pulse signal includes an electric pulse signal, an optical pulse signal and a Bluetooth pulse signal.

[0051] The sampling channel 5 is also used to receive the electric pulse signal and / or optical pulse signal and / or Bluetooth pulse signal sent by the electric energy meter 4 to be tested; Figure 3 , electrical pulse signals, optical pulse signals and Bluetooth pulse signals are all low-frequency pulse signals.

[0052] Here, the type of sampling channel 5 can be a single electric pulse sampling channel 51, an optical pulse sampling channel 52, a Bluetooth pulse sampling channel 53, or any combination thereof. Different types of sampling channels 5 are used to receive different signals. Such a design can adapt to the diverse output signal modes of the electric energy meter and ensure the synchronous collection and testing of various signals.

[0053] The connection mode of each sampling channel 5 is that each channel is directly connected to a specific sampling port of the electric energy meter. This one-to-one connection mode ensures that each channel can independently collect its corresponding pulse signal to avoid signal confusion.

[0054] Among them, refer to Figure 3 , the low pulse signal is contrasted with the high pulse signal, so that the error meter 2 generates error data based on the two pulse signals.

[0055] The error meter 2 is used to calculate the error data between each pulse signal and the reference signal according to the number of pulse cycles, the number of error sampling and the preset error calculation method.

[0056] Here, the error meter 2 processes the collected pulse signal of the electric energy meter, and calculates the error data between the pulse signal and the reference signal using a preset error calculation method according to the set number of pulse turns and the number of error samples. The calculation result of the error meter 2 is used to evaluate the measurement accuracy of the electric energy meter.

[0057] Specifically, the signal source output module 1 reads the test point parameters from the preset test file. Assume that two test points are set in the file, the parameters of test point 1 are 3 pulses and 5 error samples; the parameters of test point 2 are 4 pulses and 6 error samples.

[0058] The signal source output module 1 sends the pulse circle number and the error sampling number to the electric energy meter 4 to be tested, the signal reference module 3 and the error meter 2 according to the test point parameters.

[0059] After receiving the parameters, the signal reference module 3 generates a reference standard table signal and a reference clock signal according to the settings, and provides a high-frequency pulse as a reference for error calculation.

[0060] The electric energy meter 4 to be tested operates according to the received parameters and outputs low-frequency electric pulses, optical pulses and Bluetooth pulse signals.

[0061] The sampling channel 5 synchronously collects different types of pulse signals and transmits these signals to the error meter 2 .

[0062] The error meter 2 accumulates pulses according to the number of pulse turns, and when the set number of turns is reached, the error calculation is performed. The error meter 2 uses a preset calculation method to compare the difference between each pulse signal and the reference signal to obtain error data.

[0063] When the set number of error samples reaches the requirement, the system records the results and determines whether the current test point is completed.

[0064] After the first test point is completed, the signal source output module 1 automatically switches to the next test point and repeats the above process until the error data of all test points are collected.

[0065] In one embodiment, referring to Figure 2 The error meter 2 includes a pulse signal acquisition unit 21.

[0066] The pulse signal acquisition unit 21 is used to obtain the test parameters sent by the signal source output module 1; obtain the pulse signal sent by the sampling channel 5, and when the number of pulse signals in the uncalculated error state is the same as the number of pulse circles, obtain the current reference standard table signal corresponding to the standard table.

[0067] Here, the pulse signal acquisition unit 21 acquires the pulse signals output by the electric energy meter from each sampling channel 5. These signals represent the actual output of the electric energy meter under different measurement conditions.

[0068] Specifically, refer to Figure 4 The pulse signal acquisition unit 21 includes a control chip and a standard meter input circuit and a test energy meter input circuit respectively connected to the control chip. The test energy meter input circuit is connected to the sampling channel 5.

[0069] The input circuit of the electric energy meter to be tested processes the input pulse signal through the three transistor cascade amplifier circuits Q1, Q2 and Q3. The amplified pulse signal is further stabilized by the filter capacitor and the protection diode, and finally output to the control chip U1.

[0070] The input circuit of the electric energy meter to be tested includes a signal input terminal S, and the 3rd pin of S is connected to the power supply voltage VCC. The 2nd pin of S is connected to the ground GND through the first diode D1, and D1 mainly plays a protective role to prevent the influence of signal overload or reverse voltage on the circuit.

[0071] Pin 1 of S is respectively connected to the first end of the first resistor R1, the second end of the third resistor R3, the first end of the third diode D3 and the first end of the fourth resistor R4.

[0072] S is connected to the base of the third transistor Q3 via the resistor R1 for providing an input signal to Q3.

[0073] R1 is connected to the base of Q3 through a second diode, and is used to provide current limiting of the input signal for the base of Q3.

[0074] R2 is connected between the emitter of Q3 and ground and is used to set the operating current of Q3.

[0075] R3 is connected between S and the power supply voltage to limit the input signal current and protect the circuit.

[0076] R4 is connected to the base of the second transistor Q2 through a fourth diode D4 to provide a base bias current for Q2.

[0077] The fifth resistor R5 is connected between the emitter of Q2 and ground.

[0078] The sixth resistor R6 is connected between the collector of Q2 and the power supply voltage, and provides current to the collector of Q2.

[0079] The seventh resistor R7 is connected between the collector of Q2 and the base of the first transistor Q1, and provides current to the base of Q1.

[0080] The eighth resistor R8 is connected between the collector of Q1 and the power supply voltage to limit the collector current of Q1.

[0081] The first capacitor C1 is connected between the emitter of Q2 and ground to filter out high-frequency noise and stabilize the output signal.

[0082] Among them, Q3 is the primary amplifier, which receives the input signal from S and passes it to Q2 after amplification. Q2 acts as an intermediate amplifier, further amplifies the signal from Q3, and passes the amplified signal to Q1. Q1 is the final amplifier, which receives the amplified signal and outputs the final amplified signal to U1.

[0083] Reference Figure 4 The input circuit of the electric energy meter to be tested includes an electric pulse input subcircuit, an optical pulse input subcircuit and a Bluetooth pulse input subcircuit, which are connected to U1 respectively. Among them, the signal input end of the electric pulse input subcircuit is S1, the signal input end of the optical pulse input subcircuit is S2, and the signal input end of the Bluetooth pulse input subcircuit is S3.

[0084] Reference Figure 4 , the standard meter input circuit includes a fourth transistor Q4, a ninth resistor R9 and a tenth resistor R10.

[0085] The base of Q4 is connected to the standard meter through R9 for receiving the signal from the standard meter.

[0086] The base of Q4 is connected to the first end of R10. R10 is a base current limiting resistor to prevent excessive base current and protect Q4.

[0087] The emitter of Q4 and the second end of R10 are both connected to ground.

[0088] The collector of Q4 is connected to U1 for inputting the standard meter signal into U1.

[0089] The pulse signal acquisition unit 21 will track the number of pulse signals collected. When the set number of pulse cycles is reached (ie, enough pulse signals are accumulated to perform an error calculation), the acquisition unit will obtain the current reference standard table signal of the standard table.

[0090] In one embodiment, referring to Figure 2 The error meter 2 also includes an error calculation unit 22; the pulse signal acquisition unit 21 is connected to the error calculation unit 22; the error data includes an original error value, a maximum error value and an average error value.

[0091] The pulse signal acquisition unit 21 is also used to send each pulse signal and the current reference standard table signal to the error calculation unit 22 .

[0092] Here, after accumulating enough pulse signals, the pulse signal acquisition unit 21 sends these signals and the corresponding reference standard table signals to the error calculation unit 22. This step is a prerequisite for calculating error data, ensuring that each calculation has complete input data.

[0093] The error calculation unit 22 is used to calculate the original error value between each pulse signal and the current reference standard table signal based on a preset error calculation method; based on the preset error calculation method and each original error value, the maximum error value and the average error value corresponding to the test point are calculated; when the number of original error values ​​reaches the number of error samples, a test point test completion signal is sent to the pulse signal acquisition unit 21 and the signal source output module 1, so that the pulse signal acquisition unit 21 stops working, and the signal source output module 1 sends the test parameters corresponding to the next test point.

[0094] Here, refer to Figure 5 , the multiple pulse signals collected are normalized to eliminate the influence of individual outliers on the results.

[0095] The error calculation unit 22 continuously generates error data, and when the set number of error samples is reached, a test completion signal is sent to other modules of the system, indicating that the measurement work of the current test point has been completed.

[0096] After receiving the completion signal, the pulse signal acquisition unit 21 stops the current acquisition work, and the signal source output module 1 starts to configure the parameters of the next test point, and the system enters a new measurement cycle.

[0097] Specifically, the error calculation method includes:

[0098] 1. Calculation method of original error value.

[0099] By accurately switching the standard electric energy meter constant, the highest accuracy can be achieved, avoiding the situation where the measurement point is 1A but the actual measurement is performed at the 100A position, which leads to an increase in system error and random error, and an increase in measurement uncertainty.

[0100] based on Figure 6 According to the voltage and current values ​​corresponding to each test point, the standard electric energy meter constant CH of the corresponding standard meter is determined.

[0101] According to the number of pulse turns, the theoretical high-frequency pulse output number of the standard meter is determined. For example, when the number of pulse turns is 3, the theoretical high-frequency pulse output number of the standard meter is K=3CH.

[0102] When the electric energy meter 4 to be tested outputs 3 pulses, the actual high-frequency pulse number K′ of the standard meter at this time is immediately recorded.

[0103] The original error value is calculated as

[0104] Assume that a power meter 4 is to be tested, the current at the test point is 1A, the voltage is 240V, and the set number of pulse turns is 3. At this time, the error is calculated by the constant of the standard power meter.

[0105] According to the measuring range of the electric energy meter, the standard electric energy meter constant is determined to be 8×10 7 p / kWh.

[0106] The number of pulse turns is 3, so the theoretical high-frequency pulse output number of the standard electric energy meter is 2.4×10 8 .

[0107] When the electric energy meter 4 to be tested outputs 3 pulses, the actual high-frequency pulse number K' of the standard electric energy meter is immediately recorded as 2.3999×10 8 .

[0108] The calculated original error value is E=0.00417%.

[0109] It is determined that the original error value of the electric energy meter 4 to be tested at the 1A test point is 0.00417%.

[0110] 2. Calculation of the maximum error value and the average error value.

[0111] The error data of each sampling channel 5 at the same test point includes:

[0112] ①According to the number of error samples N, N original errors are obtained.

[0113] ② Based on the N errors collected, calculate the maximum error value (absolute value, retaining the sign bit) and the average error value.

[0114] Assume that the electric energy meter 4 to be tested is measured multiple times at the same test point, and N=5 error samplings are set. The measured original error values ​​are as follows: -0.2%, 0.1%, 0.3%, -0.1%, 0.0%.

[0115] The maximum value of these five errors is calculated to be 0.3%, and the arithmetic mean of the five errors is calculated to be 0.02%.

[0116] 3. Error indication determination method

[0117] The N original error values ​​and average values ​​are determined to ensure the accuracy and reliability of the data and avoid the situation where the arithmetic mean meets the requirements but the original error exceeds the standard.

[0118] If the two error data in the original error are -1 and 1 (unqualified), the arithmetic mean = 0 (qualified).

[0119] If the two error data in the original error are 0 and 1 (unqualified), the arithmetic mean = 0.5 (qualified).

[0120] Assuming that the standard requires the error range to be within ±0.2%, the original errors are -0.2%, 0.1%, 0.3%, -0.1%, and 0.0%, all of which are within the standard error range. And the arithmetic mean = 0.02%, which is within the allowable range, but there are still cases where the error of a single measurement point exceeds the standard.

[0121] However, 0.3% exceeds the error limit, so this measurement point fails.

[0122] Table 1 below is a table of error indications for each sampling channel 5.

[0123] Table 1 Error indication determination table

[0124]

[0125] 4. Error consistency calculation method:

[0126] In order to avoid the deviation of errors in different channels due to factors such as response delay, program processing mechanism, and other interruption effects, the consistency of measurement errors in different channels should be controlled to improve the accuracy and reliability of the measurement. Error consistency X is

[0127] Among them, E 最大值 is the maximum value of the measurement error of each sampling channel 5 at a certain test point, and E is the arithmetic mean of the measurement error of each sampling channel 5 at a certain test point.

[0128] Assume that the maximum error value of a certain test point measured on different sampling channels 5 is 0.3%, and the arithmetic mean is 0.02%.

[0129] Determine X to be 0.28%. If the consistency limit is set to 0.5%, then 0.28% meets the error consistency requirement.

[0130] Table 2 below is a table showing the error consistency of each sampling channel 5 and the error consistency of the combined channel.

[0131] Table 2 Error consistency determination table

[0132]

[0133] 5. Error variation calculation method:

[0134] The error variation of different sampling channels 5 is controlled by using standard deviation, thereby improving the accuracy and reliability of measurement. The error variation Y is Y = |E 最大值 -E 最小值 |.

[0135] Among them, E 最小值 Minimum of 5 errors for each sampling channel.

[0136] The absolute value of the difference of each sampling channel 5 is calculated, and the maximum value is determined as the error variation Y.

[0137] Assume that the maximum error among different sampling channels 5 is 0.3% and the minimum error is -0.2%.

[0138] Calculation yields Y=0.5%.

[0139] Assuming that the limit of error variation is 0.6%, the error variation of 0.5% is within the allowable range and the test passes.

[0140] Table 3 below is the error variation determination table of the maximum and minimum values ​​of each sampling channel 5.

[0141] Table 3 Error variation determination table

[0142]

[0143] In one embodiment, referring to Figure 2 The signal source output module 1 includes a signal generator 11, a voltage output unit 12, a current output unit 13 and a timing unit 14; the signal generator 11 is respectively connected to the error meter 2, the voltage output unit 12, the current output unit 13, the timing unit 14, the standard meter and the clock meter.

[0144] Here, the signal generator 11 is used to generate standard signals and control instructions to keep synchronization with other components of the system. The signal generator 11 can be an ARM (Amplitude Response Modulation Signa l Source) signal source.

[0145] The voltage output unit 12 controls and outputs a set test voltage to simulate actual working conditions.

[0146] The current output unit 13 provides a set test current for loading to the electric energy meter to simulate various load conditions.

[0147] The timing unit 14 tracks and records the time during the test to ensure accurate timing of each test stage.

[0148] The timing unit 14 is used to obtain the current test time of the error detection system of the electric energy meter.

[0149] Here, the timing unit 14 records the current time during the error detection process of the electric energy meter in real time.

[0150] The signal source output module 1 is also used to obtain the current test time when each test point is in the test completion state; determine whether the current test time is greater than or equal to the preset test cycle; if not, retest each test point.

[0151] Here, by obtaining the current test time, the signal source output module 1 can determine whether the entire test cycle has been completed, ensuring that the test data is fully collected within the specified time range to avoid the loss of error data. Among them, one test cycle corresponds to one test plan, and the test cycle can be set to 24 hours.

[0152] The signal source output module 1 compares the acquired current test time with the preset test time to determine whether the preset test cycle has been reached.

[0153] If the current test time is less than the test cycle, the signal source output module 1 will instruct the system to re-measure all test points. The purpose of this repeated test is to achieve sufficient data volume and test time to ensure the reliability and accuracy of the test results.

[0154] If the current test time is greater than or equal to the test cycle, it means that the current test plan has been completed, and the next test plan will be executed sequentially until each test plan is completed.

[0155] In one embodiment, referring to Figure 2 The error detection system of the electric energy meter also includes a report generating module 6; the report generating module 6 is connected to the error meter 2.

[0156] Here, the report generation module 6 is a component for integrating and outputting the error detection results. It collects and processes all the data of the error detection system and finally generates an error detection report. The error detection report includes a power stability report and a clock stability report. The error detection report includes a test curve, a maximum error value, a minimum error value, and an average error value.

[0157] The report generation module 6 is directly connected to the error meter 2, and obtains the original data of the error calculation from the error meter 2. Through the direct connection with the error meter 2, the report generation module 6 can obtain the test result data in the first time, and process and analyze the data to provide data support for the final generated report.

[0158] The report generating module 6 is used to generate an error detection report according to the error data corresponding to each sampling channel 5 sent by the error meter 2.

[0159] Here, after receiving the output data of the error meter 2, the report generation module 6 generates a complete error detection report according to the error data of each sampling channel 5. The error detection report usually includes the error conditions of the electric energy meter at different test points, the test results of each channel, the error statistical analysis and the overall evaluation conclusion.

[0160] Specifically, the active power stability and reactive power stability of the power meter 4 to be tested are determined according to Table 4 below, and then a power stability report is generated.

[0161] The clock stability of the electric energy meter 4 to be tested is determined according to Table 4 below, and then a clock stability report is generated.

[0162] Table 4 Active power and reactive power stability standards

[0163]

[0164]

[0165] The embodiment of the present invention provides an error detection system for an electric energy meter, comprising: at least one sampling channel, a signal source output module, an error meter and a signal reference module; the signal source output module is connected to the error meter and the signal reference module respectively; the error meter is connected to the external electric energy meter to be tested through the sampling channel; the signal source output module is connected to the electric energy meter to be tested; the signal source output module is used to obtain the test parameters corresponding to each test point in the test file, and send the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to a test parameter; the test parameters include the number of pulse turns and the number of error samples; the signal reference module is used to generate a reference signal according to the test parameters, and send the reference signal to the error meter; the sampling channel is used to receive the pulse signal sent by the electric energy meter to be tested, and send the pulse signal to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; the error meter is used to calculate the error data between each pulse signal and the reference signal according to the number of pulse turns, the number of error samples and the preset error calculation method. In this way, multiple error types can be detected synchronously, so that the test efficiency is significantly improved, and the measurement results are more comprehensive and accurate.

[0166] Embodiment 2:

[0167] Figure 7 This is a flow chart of an error detection method for an electric energy meter provided in Embodiment 2 of the present invention.

[0168] The error detection method of the electric energy meter is applied to any of the above-mentioned error detection systems of the electric energy meter.

[0169] Reference Figure 7 , methods include:

[0170] Step S101, obtain the test parameters corresponding to each test point in the test file through the signal source output module, and send the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to a test parameter; the test parameters include the number of pulse cycles and the number of error samples.

[0171] Step S102, generating a reference signal according to the test parameters through a signal reference module, and sending the reference signal to an error meter;

[0172] Step S103, receiving a pulse signal sent by the electric energy meter to be tested through a sampling channel, and sending the pulse signal to an error meter; wherein the signal type of the pulse signal received by each sampling channel is different;

[0173] Step S104, the error meter calculates the error data between each pulse signal and the reference signal according to the number of pulse cycles, the number of error sampling and the preset error calculation method.

[0174] The embodiment of the present invention provides an error detection method for an electric energy meter, which significantly improves the efficiency, accuracy and reliability of error detection of the electric energy meter through technical means such as multi-channel synchronous sampling, automatic control, precise error calculation and automatic report generation, and provides comprehensive performance evaluation and quality assurance.

[0175] An embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the error detection method for the electric energy meter provided in the above embodiment are implemented.

[0176] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the error detection method of the electric energy meter of the above embodiment are executed.

[0177] The computer program product provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment and will not be repeated here.

[0178] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0179] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0180] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0181] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0182] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An error detection system for an electric energy meter, It is characterized in that include: at least one sampling channel, a signal source output module, an error meter and a signal reference module; The signal source output module is connected to the error meter and the signal reference module respectively; the error meter is connected to the external electric energy meter to be tested through the sampling channel; the signal source output module is connected to the electric energy meter to be tested; The signal source output module is used to obtain the test parameters corresponding to each test point in the test file, and send the test parameters to the electric energy meter to be tested, the signal reference module and the error meter; Each of the test points corresponds to a test parameter; the test parameters include the number of pulse turns and the number of error samples; The signal reference module is used to generate a reference signal according to the test parameters and send the reference signal to the error meter; The sampling channel is used to receive the pulse signal sent by the electric energy meter to be tested, and send the pulse signal to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; The error meter is used to calculate the error data between each of the pulse signals and the reference signal according to the number of pulse cycles, the number of error sampling and a preset error calculation method.

2. The error detection system for an electric energy meter according to claim 1, It is characterized in that The sampling channel includes an electric pulse sampling channel and / or an optical pulse sampling channel and / or a Bluetooth pulse sampling channel; each of the sampling channels is respectively connected to a sampling port of the electric energy meter to be tested; the signal type of the pulse signal includes an electric pulse signal, an optical pulse signal and a Bluetooth pulse signal; The sampling channel is also used to receive the electrical pulse signal and / or the optical pulse signal and / or the Bluetooth pulse signal sent by the electric energy meter to be tested; the electrical pulse signal, the optical pulse signal and the Bluetooth pulse signal are all low-frequency pulse signals.

3. The error detection system for an electric energy meter according to claim 2, It is characterized in that The signal reference module includes a standard meter and a clock meter; the reference signal includes a reference standard meter signal and a reference clock signal; The reference standard table signal is a high-frequency pulse signal; The standard table is used to output a corresponding reference standard table signal according to the test parameters; The reference standard table signal includes an active pulse signal and a reactive pulse signal; The clock instrument is used to output the corresponding reference clock signal according to the test parameters.

4. The error detection system for an electric energy meter according to claim 3, It is characterized in that The error meter includes a pulse signal acquisition unit; The pulse signal acquisition unit is used to obtain the test parameters sent by the signal source output module; obtain the pulse signal sent by the sampling channel, and when the number of the pulse signals in the uncalculated error state is the same as the number of pulse circles, obtain the current reference standard table signal corresponding to the standard table.

5. The error detection system for an electric energy meter according to claim 4, It is characterized in that The error meter also includes an error calculation unit; the pulse signal acquisition unit is connected to the error calculation unit; the error data includes an original error value, a maximum error value and an average error value; The pulse signal acquisition unit is further used to send each of the pulse signals and the current reference standard table signal to the error calculation unit; The error calculation unit is used to calculate the original error value between each of the pulse signals and the current reference standard table signal based on the preset error calculation method; Based on the preset error calculation method and each of the original error values, the maximum error value and the average error value corresponding to the test point are calculated; when the number of the original error values ​​reaches the error sampling number, a test point test completion signal is sent to the pulse signal acquisition unit and the signal source output module to stop the pulse signal acquisition unit and enable the signal source output module to send the test parameters corresponding to the next test point.

6. The error detection system for an electric energy meter according to claim 5, It is characterized in that The signal source output module includes a signal generator, a voltage output unit, a current output unit and a timing unit; the signal generator is connected to the error meter, the voltage output unit, the current output unit, the timing unit, the standard meter and the clock meter respectively; The timing unit is used to obtain the current test time of the error detection system of the electric energy meter; The signal source output module is further used to obtain the current test time when each of the test points is in a test completion state; Determine whether the current test time is greater than or equal to a preset test period; if not, retest each of the test points.

7. The error detection system for an electric energy meter according to claim 1, It is characterized in that The error detection system of the electric energy meter further comprises a report generation module; the report generation module is connected to the error meter; The report generating module is used to generate an error detection report according to the error data corresponding to each sampling channel sent by the error meter.

8. A method for detecting an error in an electric energy meter, It is characterized in that The error detection system for the electric energy meter according to any one of claims 1 to 7, the method comprising: The test parameters corresponding to each test point in the test file are obtained through the signal source output module, and the test parameters are sent to the electric energy meter to be tested, the signal reference module and the error meter; each test point corresponds to one test parameter; the test parameters include the number of pulse turns and the number of error samples; Generate a reference signal according to the test parameters by the signal reference module, and send the reference signal to the error meter; The pulse signal sent by the electric energy meter to be tested is received through the sampling channel, and the pulse signal is sent to the error meter; wherein the signal type of the pulse signal received by each sampling channel is different; The error meter calculates the error data between each of the pulse signals and the reference signal according to the number of pulse turns, the number of error sampling and a preset error calculation method.

9. An electronic device, It is characterized in that The method comprises a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and is characterized in that when the processor executes the computer program, the error detection method for the electric energy meter described in claim 8 is implemented.

10. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the error detection method for an electric energy meter as claimed in claim 8 is implemented.

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