Error monitoring device of electric energy meter

Abstract

The invention discloses an error monitoring device for an electric energy meter, and the device comprises a data processing module which is connected with a pulse counting module, and is used for counting the pulses of a detected electric energy meter through the pulse counting module; the data processing module is connected with the mutual inductor module and is used for acquiring the line current of the electric energy meter line of the tested electric energy meter through the mutual inductor module; and the data processing module is used for reading internal data of the tested electric energy meter, calculating first electric energy of the tested electric energy meter in a preset time period according to the line current and the metering voltage, calculating second electric energy according to the pulse number and the internal data in the preset time period, and determining whether the tested electric energy meter has an error according to the first electric energy and the second electric energy. According to the invention, pulse counting and line current detection are carried out on the electric energy meters, two paths of electric energy are calculated and compared, whether the electric energy meters have errors or not is rapidly and accurately judged, the errors of each node and each electric energy meter in the line can be monitored on line, the monitoring cost of the electric energy meters is reduced, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of electric energy meter monitoring, and in particular to an error monitoring device for an electric energy meter. Background Art

[0002] The existing method for error checking of electric energy meters is to install an intelligent analysis module in the power grid system, obtain the data of the electric energy meters in the circuit, and analyze the errors of the electric energy meters through AI intelligent algorithms. Intelligent data analysis lacks hardware data for comparison, and the accuracy of error checking requires the support of a large amount of data. However, data collection requires a lot of work, resulting in a lack of training data. Therefore, the existing technology cannot guarantee the accuracy of error checking and lacks flexibility in the face of emergency monitoring scenarios. Summary of the invention

[0003] Based on this, it is necessary to propose an error monitoring device for an electric energy meter to address the technical problem that the intelligent analysis method in the prior art cannot ensure the accuracy of the error verification of the electric energy meter.

[0004] An error monitoring device for an electric energy meter, the monitoring device comprising: a pulse counting module, a mutual inductor module and a data processing module, all of which are connectable to the electric energy meter to be tested;

[0005] The data processing module is connected to the pulse counting module and is used to count the pulses emitted by the electric energy meter under test through the pulse counting module;

[0006] The data processing module is connected to the transformer module and is used to obtain the line current of the electric energy meter line of the electric energy meter under test through the transformer module;

[0007] The data processing module is also used to read the internal data of the electric energy meter under test, wherein the internal data includes the metering current and the metering voltage measured by the electric energy meter under test;

[0008] The data processing module is also used to calculate the first electric energy of the electric energy meter under test within a preset time period based on the line current and the metering voltage, calculate the second electric energy of the electric energy meter under test based on the number of pulses and internal data within the preset time period, and determine whether there is an error in the electric energy meter under test based on the difference between the first electric energy and the second electric energy.

[0009] The error monitoring device of the electric energy meter provided in the present application calculates the size of two electric energy lines and compares them by counting the pulses of the electric energy meter and detecting the line current, so as to quickly and accurately determine whether there is an error in the electric energy meter, and can flexibly respond to various monitoring scenarios. The present application can monitor the error of each electric energy meter at each node in the line online through data collection and processing, without the need for a large amount of data for model training, thus reducing the monitoring cost of the electric energy meter, solving the problem of on-site detection of the electric energy meter, and reducing the risk of on-site operations. It can be applied to the detection of electric energy meters at each node, has a wide range of applications, and has high economic use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] in:

[0012] Figure 1 is a structural block diagram of an error monitoring device for an electric energy meter in one embodiment;

[0013] Figure 2 is a circuit diagram of a pulse input module in one embodiment;

[0014] Figure 3 is a circuit diagram of a pulse analysis module in one embodiment;

[0015] Figure 4 A circuit diagram of an RS232 circuit module in one embodiment;

[0016] Figure 5 A partial circuit diagram of a data processing module in one embodiment;

[0017] Figure 6 is a circuit diagram of a communication module of a data processing module in one embodiment;

[0018] Figure 7 The figure is a schematic diagram of the appearance of an error monitoring device of an electric energy meter in one embodiment. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0020] The power grid metering management is developing towards online operation and maintenance and status monitoring. The online operation and maintenance function module has been built in the metering automation system, and the on-site inspection of the energy meter is carried out by online monitoring means. The terminal mainly collects the voltage, current and power of the energy meter for data analysis and judgment of the operation status, and has the function of operating circuit status monitoring. Although the online monitoring of the metering device has been extended to the operating circuit of the metering device on the customer side, the error of the energy meter itself has not been monitored.

[0021] The prior art also discloses the installation of an intelligent analysis module in the power grid system to verify the errors of the electricity meters. The data intelligent analysis lacks hardware data for comparison, and the accuracy requires the support of data accumulation. In the case of insufficient training data, the accuracy of error monitoring cannot be guaranteed, and it lacks flexibility in the face of emergency monitoring scenarios.

[0022] Based on this, the present application provides an error monitoring device for an electric energy meter.

[0023] like Figure 1 As shown, in one embodiment, an error monitoring device for an electric energy meter is provided. The error monitoring device 100 for an electric energy meter comprises: a pulse counting module 10, a mutual inductor module 20 and a data processing module 30, all of which can be connected to a measured electric energy meter 40;

[0024] The data processing module 30 is connected to the pulse counting module 10 and is used to count the pulses emitted by the measured electric energy meter 40 through the pulse counting module 10;

[0025] The data processing module 30 is connected to the transformer module 20 and is used to obtain the line current of the electric energy meter line of the electric energy meter 40 under test through the transformer module 20;

[0026] The data processing module 30 is also used to read the internal data of the electric energy meter 40 under test, wherein the internal data includes the metering current and the metering voltage measured by the electric energy meter 40 under test;

[0027] The data processing module 30 is also used to calculate the first electric energy of the electric energy meter 40 under test within a preset time period based on the line current and the metering voltage, calculate the second electric energy of the electric energy meter 40 under test according to the number of pulses and internal data within the preset time period, and determine whether there is an error in the electric energy meter 40 under test according to the difference between the first electric energy and the second electric energy.

[0028] Specifically, the electric energy meter 40 under test can be a customer-side electric energy meter, and the error monitoring device 100 of the electric energy meter can be connected to the electric energy meter 40 under test. More specifically, the pulse counting module 10, the mutual inductor module 20 and the data processing module 30 of the error monitoring device 100 of the electric energy meter can all be connected to the electric energy meter 40 under test through corresponding interfaces and wiring.

[0029] The pulse counting module 10 is connected to the electric energy meter 40 under test, and is used to obtain the pulse data of the electric energy meter 40 under test and input it to the data processing module 30 after processing. The data processing module 30 can obtain the pulse number of the pulses emitted by the electric energy meter 40 under test based on the processed pulse data.

[0030] The data processing module 30 is connected to the electric energy meter 40 to be tested, and is used for communicating or data exchange with the electric energy meter 40 to read the internal data measured by the electric energy meter 40 itself.

[0031] The mutual inductor module 20 is connected to the electric energy meter 40 under test, and is used to obtain the mutual inductance current of the electric energy meter 40 under test, and convert the mutual inductance current into readable data and transmit it to the data processing module 30. The data processing module 30 processes the readable data to obtain the actual line current of the electric energy meter 40 under test.

[0032] The internal data read by the data processing module 30 includes the metering voltage. The data processing module 30 can calculate the first electric energy of the measured electric energy meter 40 within a preset time period or a preset duration according to the metering voltage and the line current obtained through the transformer module 20.

[0033] In addition, the number of pulses that the tested power meter 40 can emit per unit of power can be obtained based on internal data. Therefore, the second power of the tested power meter 40 can be calculated based on the number of pulses within a preset time period and the number of pulses that the tested power meter 40 can emit per unit of power.

[0034] For example, the pulse counting module 10 obtains the change in the pulse within time t. For example, from the beginning of detection to the elapsed time t, the pulse signal changes 500 times, and the measured electric energy meter 40 emits 6400 pulses for every 1 kWh of electricity. Then the electric energy within the time length t is (1 / 6400*500) kWh of electricity; among which 6400 is the number of pulses generated by the standard consumption of 1 kWh of electricity (1 kilowatt-hour).

[0035] Within the time length t, if the difference between the second electric energy calculated according to the number of pulses and the first electric energy calculated according to the mutual inductor is within the allowable error, it indicates that the error of the tested electric energy meter 40 is small or the error of the tested electric energy meter 40 is within the allowable range.

[0036] The minimum unit of electric energy measured by the electric energy meter itself is 0.1 kWh, which is not small enough and it may take a long time for the digital changes to appear. Therefore, it is not convenient to monitor the error of the electric energy meter in real time. The present application can overcome this defect.

[0037] In order to meet the use requirements of detecting errors in the electric energy meter, the error monitoring device 100 of the electric energy meter in this embodiment adopts two methods to obtain the electric energy meter data: obtaining electric energy through a mutual inductor and obtaining electric energy by receiving electric energy meter pulse analysis. After the two methods are combined to obtain two channels of electric energy, the two data are combined through an algorithm to analyze whether there is an error in the electric energy meter.

[0038] The error monitoring device 100 of the electric energy meter of the present application can monitor the error of the electric energy meter in real time online, solving the problem that the error of the existing electric energy meter cannot be accurately monitored. After the implementation of this project, it can be applied to the electric energy meter on the customer side, with a wide range of applications, improving the efficiency of electric energy meter monitoring, reducing operation and maintenance costs, and improving the benefits of the power grid company, while solving the risks of on-site operations. The error monitoring device 100 of the electric energy meter of the present application has stronger real-time performance, can measure errors faster according to needs, and consumes less resources.

[0039] The error monitoring device 100 of the electric energy meter provided in the present application calculates the size of two electric energy lines and compares them by counting the pulses of the electric energy meter and detecting the line current, so as to quickly and accurately determine whether there is an error in the electric energy meter, and can flexibly respond to various monitoring scenarios. The present application can monitor the error of each electric energy meter at each node in the line online through data collection and processing, without the need for a large amount of data for model training, thus reducing the monitoring cost of the electric energy meter, solving the problem of on-site detection of the electric energy meter, and reducing the risk of on-site operations. It can be applied to the detection of electric energy meters at each node, has a wide range of applications, and has high economic use.

[0040] In one embodiment, the pulse counting module 10 includes a pulse input module 11, a pulse analysis module 12 and an RS232 circuit module 13 which are electrically connected in sequence, the input end of the pulse input module is connected to the electric energy meter 40 to be measured, and the output end of the RS232 circuit module is connected to the input end of the data processing module 30;

[0041] A pulse input module, used for performing high-frequency voltage conversion on the original pulse data obtained from the measured electric energy meter 40 to obtain a pulse conversion output signal;

[0042] A pulse analysis module, used for converting the pulse conversion output signal into a pulse digital signal;

[0043] RS232 circuit module, used for converting the pulse digital signal into a first TTL digital signal, and inputting the first TTL digital signal to the data processing module 30;

[0044] The data processing module 30 is specifically used to obtain the pulse number according to the first TTL digital signal.

[0045] Specifically, the input end of the pulse input module is connected to the measured electric energy meter 40, and the output end is connected to the pulse analysis module, which is used to convert the acquired original pulse data into a pulse conversion output signal, and use the pulse conversion output signal as the input of the pulse analysis module.

[0046] The input end of the pulse analysis module is connected to the output end of the pulse input module, and the output end is connected to the input end of the RS232 circuit module, and is used to convert the pulse conversion output signal into a pulse digital signal.

[0047] The input end of the RS232 circuit module is connected to the output end of the pulse analysis module, and the output end is connected to the input end of the data processing module 30 , for converting the pulse digital signal into a first TTL digital signal, and inputting the first TTL digital signal to the data processing module 30 .

[0048] The data processing module 30 is specifically used to obtain the first TTL digital signal of the pulse counting module 10, and convert the first TTL digital signal into the pulse number of the pulses emitted by the measured electric energy meter 40.

[0049] Figure 2 is a circuit diagram of a pulse input module in one embodiment; Figure 3 is a circuit diagram of a pulse analysis module in one embodiment; Figure 4 A circuit diagram of an RS232 circuit module in one embodiment; Figure 5 FIG. 1 is a partial circuit diagram of a data processing module 30 in an embodiment; Figure 2-Figure 5 , Figure 2 The wiring terminal AD_I N1 on the left side of the pulse input module is connected to the measured energy meter 40 through pins 1 and 2 to obtain the original pulse data of the measured energy meter 40. Pins 1 and 2 of the wiring terminal SMA1 are connected to the ground AGND, and pins 3 and 4 are connected to pin 2 of the wiring terminal AD_I N1. Pin 1 of the wiring terminal AD_I N1 is respectively connected to one end of the diode D6, the diode D7, the resistor R72, the resistor R76, and the capacitor C131. The other end of the diode D6 is connected to -5VAA, and the other end of the diode D7 is connected to +5VAA. The second end and the third end of the resistor R72 are both connected to the other end of the capacitor 131. The other end of the capacitor C131 is also connected to the other end of the resistor R76. The capacitor C131 is also connected to the ground AGND through the resistor R73; the capacitor C131 is also connected to the pin 2 of the chip U18 through the resistors R68, R74, R69, R70, R75, and R71 in sequence; the common node of the resistor R68 and the resistor R74 is connected to the chip U Pin 4 of chip U19 is connected, pin 3 of chip U19 is grounded AGND, pin 2 of chip U19 is connected to -5VAA through inductor L20, pin 2 of chip U19 is also grounded AGND through capacitor C136, pin 2 of chip U19 is also grounded AGND through capacitor C138, pin 1 of chip U19 is the output end, the common node of resistor R69 and resistor R74 is connected to pin 1 of chip U19; pin 6 of chip U19 is connected to +5VAA through inductor L16, pin 6 of chip U19 is also grounded AGND through capacitor C129, and pin 6 of chip U19 is also grounded AGND through capacitor C22.

[0050] The common node of resistor R70 and resistor R75 is connected to pin 4 of chip U20, pin 3 of chip U20 is grounded AGND, pin 2 of chip U20 is connected to -5VAA through inductor L21, pin 2 of chip U20 is also grounded AGND through capacitor C137, pin 2 of chip U20 is also grounded AGND through capacitor C139, pin 1 of chip U20 is the output end, the common node of resistor R71 and resistor R75 is connected to pin 1 of chip U20; pin 6 of chip U20 is connected to +5VAA through inductor L17, pin 6 of chip U20 is also grounded AGND through capacitor C128, and pin 6 of chip U20 is also grounded AGND through capacitor C130.

[0051] Pin 8 of chip U18 is connected to signal MAMPR, which is the node voltage or node signal between resistor R69 and resistor 70. Pin 6 of chip U18 is connected to signal MUX0_A0. Pin 4 of chip U18 is connected to +5VAA through inductor L18. Pin 4 of chip U18 is also connected to ground AGND through capacitor C134. Pin 4 of chip U18 is also connected to ground AGND through capacitor C132. Pin 1 of chip U18 is the output terminal, and signal AMP_OUT is input to the pulse analysis module. Signal AMP_OUT is the pulse conversion output signal. Pin 3 of chip U18 is connected to ground AGND. Pin 7 of chip U18 is connected to -5VAA through inductor L19. Pin 7 of chip U18 is connected to ground AGND through capacitor C133. Pin 7 of chip U18 is connected to ground AGND through capacitor C135.

[0052] certainly Figure 2 This is just an exemplary circuit diagram. Figure 2 The chips U19 and U20 in the system can also be replaced by other chips. Figure 2 The resistance or capacitance of each component in the embodiment can be set according to actual conditions, and this application does not impose any restrictions on this.

[0053] Figure 3The input end of the pulse analysis module is connected to the pulse conversion output signal AMP_OUT, and the pulse conversion output signal AMP_OUT is connected to the ground AGND through the input end of the pulse analysis module, resistor R81, resistor R86, and resistor R93 in turn. The pulse conversion output signal AMP_OUT is connected to the ground AGND through the input end of the pulse analysis module, capacitor C159, and capacitor C162 in turn; the common node of capacitor C159 and capacitor C162, and the common node of resistor R86 and resistor R93 are all connected to pin 3 of chip U22, pin 2 of chip U22 is connected to voltage 5VAA through inductor L30, pin 2 of chip U22 is connected to ground AGND through capacitor C166, and chip Pin 2 of U22 is connected to ground AGND through capacitor C165, pin 1 of chip U22 is connected to voltage +1VA through resistors R83, R80 and inductor L26 in sequence, pin 1 of chip U22 is connected to ground AGND through resistors R83, R80 and capacitor C153 in sequence, pin 1 of chip U22 is connected to ground AGND through resistors R83, R80 and capacitor C154 in sequence, pin 4 of chip U22 is connected to voltage +1VA through resistor R80 and inductor L26, pin 6 of chip U22 is connected to voltage +5VAA through inductor L27, pin 6 of chip U22 is connected to ground AGND through capacitor C155, and pin 6 of chip U22 is connected to ground AGND through capacitor C156.

[0054] Pin 1 of chip U22 is also connected to pin 2 of chip U21 through resistor R92, and pin 1 of chip U22 is also connected to pin 1 of chip U21 through resistors R92 and R91. Pin 3 of chip U21 is connected to pin 4 of chip U21 through resistor R89, and pin 3 of chip U21 is also grounded to AGND through resistors R90 and R85. Pin 3 of chip U21 is also connected to the resistance control end of resistor R78 through resistor R90. Pins 5, 6, 7, and 8 of chip U21 are all connected to voltage +5VAA through inductor L28. Pins 5, 6, 7, and 8 of chip U21 are all grounded to AGND through capacitor C157. Pins 5, 6, 7, and 8 of chip U21 are all grounded to AGND through capacitor C158. Pin 9 of chip U21 is grounded to AGND through capacitor C161. Voltage +3V3ADC is grounded to AGND through resistors R82 and R88 in turn. The common node of resistors R82 and R88 is also connected to pin 9 of chip U21. The voltage +5VAA is connected to the ground AGND through the inductor L25 and the capacitor C152 in sequence. The voltage +5VAA is connected to the voltage -5VAA through the inductor L25, the resistor R79, the resistor R78, the resistor R77, and the inductor L24 in sequence. The voltage +5VAA is connected to the ground AGND through the inductor L25, the resistor R79, the resistor R78, the resistor R77, and the capacitor C151 in sequence. The pin 10 of the chip U21 is connected to the first input terminal of the RS232 circuit module through the resistor R84 to input the signal AI NP to the RS232 circuit module. The pin 11 of the chip U21 is connected to the second input terminal of the RS232 circuit module through the resistor R87 to input the signal AI NN to the RS232 circuit module. One end of the capacitor C160 is connected to the first input terminal of the RS232 circuit module, and the other end is connected to the second input terminal of the RS232 circuit module. Pin 12 of chip U21 is connected to voltage +5VAA, pins 13, 14, 15, and 16 of chip U21 are connected and connected to voltage -5VAA through inductor L29, pins 13, 14, 15, and 16 of chip U21 are connected and connected to ground AGND through capacitor C163, and pins 13, 14, 15, and 16 of chip U21 are connected and connected to ground AGND through capacitor C164.

[0055] Figure 4The RS232 circuit module is connected to the output end of the pulse analysis module through the wiring port DB1 through pins 10 and 11 to access the signal AI NP and the signal AI NN. The wiring port DB1 is connected to the pins 14 and 13 of the chip U5 through pins 2 and 3 respectively, and the pins 14 and 13 of the chip U5 are connected to the signal AI NP and the signal AI NN; the pin 16 of the chip U5 is connected to the voltage VCC3.3, the pin 15 of the chip U5 is grounded, and the two ends of the capacitor C24 are connected to the pins 15 and 16 of the chip U5 respectively; the pins 12 and 11 of the chip U5 are output ends, respectively connected to the pins 30 and 29 of the chip U1 in the data processing module 30; the pin 1 of the chip U5 is connected to its pin 3 through the capacitor C26, and the pin 2 of the chip U5 is grounded through the capacitor C25; the pin 4 of the chip U5 is connected to its pin 5 through the capacitor C27; the pin 6 of the chip U5 is grounded through the capacitor C28. Chip U5 may be a MAX3232ESE chip.

[0056] certainly Figure 4 This is just an exemplary circuit diagram. Figure 4 The chip U5 in the system can also be replaced by other chips. Figure 4 The resistance or capacitance of each component in the embodiment can be set according to actual conditions, and this application does not impose any restrictions on this.

[0057] Figure 5 The data processing module 30 is the main control module, which includes a chip U1 and auxiliary circuits. Pin 1 and pin 64 of chip U1 are both connected to the voltage VCC3.3, and pin 1 and pin 64 of chip U1 are also grounded through capacitor C22, and pin 63 of chip U1 is grounded; pin 48 of chip U1 is connected to the voltage VCC3.3, and pin 48 of chip U1 is also grounded through capacitor C23, and pin 47 of chip U1 is grounded; pin 32 of chip U1 is connected to the voltage VCC3.3, and pin 32 of chip U1 is also grounded through capacitor C21, and pin 31 of chip U1 is grounded; pin 19 of chip U1 is connected to the voltage VCC3.3, and pin 19 of chip U1 is also grounded through capacitor C20, and pin 18 of chip U1 is grounded; pin 13 of chip U1 is connected to the voltage VCC3.3, and pin 13 of chip U1 is also grounded through capacitor C19, and pin 12 of chip U1 is grounded.

[0058] Pin 29 of chip U1 is connected to signal PB10, and pin 30 of chip U1 is connected to signal PB11. Signal PB10 is the output of pin 11 of chip U5 in the RS232 circuit module, and signal PB11 is the output of pin 12 of chip U5 in the RS232 circuit module.

[0059] Of course, the data processing module 30 also includes the external circuits of the chip U1, such as a power supply circuit, an external crystal oscillator, a reset circuit, a startup circuit, a SWD download circuit (SWD: Serial Wire Debug, representing serial wire debugging), an LED control circuit, a USART circuit (USART: Universal Synchronous / Asynchronous Receiver / Transmitter, universal synchronous / asynchronous serial receiver / transmitter, USART is a full-duplex universal synchronous / asynchronous serial transceiver module, and the interface is a highly flexible serial communication device), etc. One or more of them (not shown in this application).

[0060] It should be noted that the above circuit diagram is only an exemplary circuit diagram. The chip in the figure can also be replaced by other chips. The resistance or capacitance of each component in the figure can be set according to actual conditions, and this application does not impose any restrictions on this.

[0061] The device obtains the pulse of the electricity meter and converts the pulse data into readable data through an algorithm, ensuring that the application layer code meets the relevant communication protocols of the power grid while being efficient, stable and secure, ensuring the efficiency and stability of communication between the device and the terminal, and effectively avoiding risks such as data leakage.

[0062] This embodiment can convert the original pulse data into a TTL digital signal that can be received by the data processing module 30 through pulse input, pulse analysis and RS232 circuit, so that the data processing module 30 can obtain the pulse number through processing.

[0063] In one embodiment, the mutual inductor module 20 is used to obtain the mutual inductance current of the electric energy meter circuit of the electric energy meter 40 under test, convert the mutual inductance current into a first digital signal and transmit it to the data processing module 30;

[0064] The data processing module 30 is used to convert the first digital signal into the line current of the electric energy meter line of the electric energy meter 40 under test.

[0065] Specifically, the mutual inductor module 20 is equipped with a high-precision mutual inductor. For example, the mutual inductor module 20 can convert the 0-10A current of the electric energy meter line into 0-10mA current through a transformation ratio of 1000:1. The current of 0-10ma is the mutual inductance current range.

[0066] The mutual inductor module 20 can also convert the actually monitored mutual inductance current (for example, any current value in the range of 0-10 mA) into a first digital signal, and the data processing module 30 obtains the actual line current according to the first digital signal.

[0067] In this embodiment, the mutual inductance current can be obtained according to the mutual inductance module 20 and converted into a digital signal that can be received by the data processing module 30, and then the line current is obtained according to the digital signal.

[0068] In one embodiment, the mutual inductor module 20 includes a mutual inductor and a differential analog input conversion module;

[0069] The mutual inductor is connected to the electric energy meter circuit of the electric energy meter 40 to be measured, and is used to obtain the mutual inductance current of the electric energy meter circuit through mutual inductance;

[0070] A differential analog quantity input conversion module, used for converting the mutual inductance current into a first digital signal;

[0071] The data processing module 30 specifically obtains the first digital signal from the differential analog input conversion module through the RS485 communication mode and the MODBUS communication protocol.

[0072] Specifically, the transformer module 20 is equipped with a high-precision transformer. For example, the 0-10A current connected to the electric energy meter line can be converted into a 0-10mA current through a transformation ratio of 1000:1, and then connected to a differential analog input conversion module based on DM3152 to linearly convert 0-10mA into a number of 0-4095 (i.e., a first digital signal). The data processing module 30 (such as MCU) can read the first digital signal using the MODBUS communication protocol through communication methods such as RS485 and then convert it to obtain the actual line current size.

[0073] In this embodiment, the mutual inductance module 20 converts the mutual inductance current into a first digital signal that can be received by the data processing module 30 through the differential analog input conversion module, so that the data processing module 30 obtains the line current according to the digital signal conversion.

[0074] In one embodiment, the data processing module 30 specifically obtains the digital input signal of the measured electric energy meter 40 through the 485 communication module, and the 485 communication module is also used to convert the digital input signal into a second TTL digital signal, and input the second TTL digital signal to the data processing module 30;

[0075] The data processing module 30 is specifically used to obtain the internal data corresponding to the tested electric energy meter 40 according to the second TTL digital signal.

[0076] Specifically, the communication module of the data processing module 30 in this embodiment is a 485 communication module. The electric energy meter 40 under test can exchange data with the data processing module 30 through RS485 communication.

[0077] Figure 6The communication module of the data processing module 30 is a 485 communication module; the terminal P1 is connected to the electric energy meter 40 under test to obtain the digital input signal of the electric energy meter 40 under test, the pin 1 of the terminal P1 is grounded through the resistor R13, the pin 1 of the terminal P1 is connected to the pin 7 of the chip U4, the pin 1 of the terminal P1 is also connected to the voltage VCC3.3 through the resistors R11 and R12 in sequence, the pin 2 of the terminal P1 is connected to the power supply VCC3.3 through the resistor R12, the pin 2 of the terminal P1 is connected to the pin 6 of the chip U4, the pin 8 of the chip U4 is connected to the voltage VCC3.3, the pin 5 of the chip U4 is grounded, the pins 2 and 3 of the chip U4 are connected and connected to the pin 10 of the chip U1 in the data processing module 30, the pin 1 of the chip U4 is connected to the pin 17 of the chip U1, and the pin 4 of the chip U4 is connected to the pin 16 of the chip U1.

[0078] Among them, the chip U4 can be the chip SP3485EN-L / TR.

[0079] In addition, other modules can also be provided with RS-485 interfaces for communicating with the MCU (data processing module 30). The MCU can configure various parameters of the modules and read data, and conduct time-sharing two-way communication between independent modules and the MCU through a bus network, thus forming a complete data acquisition system.

[0080] In TTL (Transistor-Transistor Logic) level signaling, +5V is equivalent to logic "1" and 0V is equivalent to logic "0" (when binary is used to represent data). This data communication and level specification method is called TTL (Transistor-Transistor Logic Level) signaling system. This is the standard technology for communication between various parts of a device controlled by a computer processor.

[0081] The internal main control chip of the data processing module 30 of this embodiment can adopt an ARM32-bit MCU, and the conversion between the TTL level signal of the MCU and the RS485 signal of the electric energy meter is realized through the SP3485 chip, so that the MCU can read the internal data of the electric energy meter.

[0082] In one embodiment, the internal data also includes metered electrical energy;

[0083] The data processing module 30 is specifically used to determine the number of pulses emitted by the measured electric energy meter 40 per unit of electric energy consumed according to the distribution of the measured electric energy and the number of pulses, and calculate the second electric energy of the measured electric energy meter 40 according to the number of pulses within a preset time period and the number of pulses emitted by the measured electric energy meter 40 per unit of electric energy consumed.

[0084] Specifically, according to the distribution of the measured electric energy and the number of pulses, the number of pulses emitted by each unit of electric energy consumed can be calculated, and then the average number of pulses of the multiple units of electric energy can be calculated, and the average number of pulses can be used as the number of pulses emitted by the measured electric energy meter 40 per unit of electric energy consumed.

[0085] For example, the unit of electrical energy is 1 kWh, the number of pulses emitted for each kWh is 6400, and the number of pulses within a time period of t is x, then the electrical energy within a time period of t is (1 / 6400*x) kWh.

[0086] The duration t can be within 1 minute, within 2 minutes, within 5 minutes, etc. This application does not limit the error detection interval of the electric energy meter.

[0087] In one embodiment, the error monitoring device 100 of the electric energy meter also includes a device body, and the pulse counting module 10, the transformer module 20, and the data processing module 30 are all installed in the device body, and the electric pulse interface of the pulse counting module 10 can be connected to the external measured electric energy meter 40 through the first opening of the device body, the transformer interface of the transformer module 20 can be connected to the measured electric energy meter 40 by passing through the second opening of the device body, and the communication interface of the data processing module 30 can be connected to the measured electric energy meter 40 through the third opening of the device body.

[0088] Specifically, Figure 7 FIG. 1 is a schematic diagram of an electric energy meter error monitoring device 100 according to an embodiment of the present invention. Figure 7 The electric pulse interface of the pulse counting module 10 can pass through the first opening of the device body and be connected to the external measured electric energy meter 40 through wiring.

[0089] The transformer interface of the transformer module 20 can pass through the second opening of the device body and be connected to the measured electric energy meter 40 through wiring.

[0090] The communication interface (485 interface) of the data processing module 30 can be connected to the measured electric energy meter 40 through the third opening of the device body through wiring.

[0091] The first opening, the second opening, and the third opening of the device body may be located on different surfaces of the device body, or on the same surface, or distributed on at least two surfaces. Figure 7 All the openings are located on the same surface, which is only an exemplary description and is not limited in this application.

[0092] This embodiment can protect the circuit and facilitate carrying by installing the circuit module in the device body, and is convenient for connection with the electric energy meter 40 to be tested, which is convenient and practical.

[0093] In one embodiment, the error monitoring device 100 of the electric energy meter further includes a power module installed in the device body, and the power module is used to convert the input voltage into a target output voltage to power other modules;

[0094] The power port of the power module can be connected to an external power source through a fourth opening of the device body;

[0095] The power button of the power module passes through the fifth opening of the device body and is exposed to the outer surface of the device body.

[0096] Specifically, the power module may include at least one power conversion module, each of which is used to convert an input voltage into a target output voltage. For example, a 5V to 3.3V power conversion module can convert an input 5V voltage into an output voltage of 3.3V to power some modules. For another example, a 12V to 5V power conversion module can convert an input 12V voltage into an output voltage of 5V to power some modules, and so on, which is not limited in this application.

[0097] refer to Figure 7 The power port of the power module is a DC power port (direct current power port) that can be connected to an external power source. The power button of the power module is exposed on the outer surface, allowing the user to turn the power on or off.

[0098] This embodiment can more conveniently control the power supply of the device by providing a power port and a power button, thereby ensuring the power safety of the device.

[0099] In one embodiment, the error monitoring device 100 of the electric energy meter further includes a display module;

[0100] The display screen included in the display module is installed on the upper end surface of the device body, and the upper end surface at least includes at least one opening among the first opening, the second opening, the third opening, the fourth opening and the fifth opening.

[0101] Specifically, the display module of the error monitoring device 100 of the electric energy meter is connected to the data processing module 30, and is used to receive and display the data of the data processing module 30. For example, the line current, the number of pulses, the internal data of the electric energy meter 40 under test, and whether there is an error in the electric energy meter 40 under test can be displayed.

[0102] In addition, the display screen of the display module may be an operable touch screen that can be operated by a user.

[0103] The display screen can be installed on the upper end surface of the device body in an embedded manner, and the upper end surface is the front side of the device.

[0104] In this embodiment, the display module is provided to more intuitively display various data of the electric energy meter 40 under test, thereby facilitating human-computer interaction.

[0105] In one embodiment, the error monitoring device 100 of the electric energy meter also includes a protective cover, one side of which is movably connected to one side of the upper end surface of the device body, and the protective cover can be flipped over to cover the device body; or, the protective cover can cover the upper end surface of the device body or be removed from the upper end surface; wherein the upper end surface includes at least one opening among the first opening, the second opening, the third opening, the fourth opening and the fifth opening.

[0106] Specifically, the monitoring device of this embodiment is further provided with a protective cover, which can be hinged to the device body through one side, and the protective cover can be flipped open or closed as a flip cover. Alternatively, the protective cover can be covered on the device body, or removed or uncovered from the device body. The protective cover can also be covered on the device body in other ways, which is not limited by the present application.

[0107] In this embodiment, the protective cover can be provided to effectively protect various interfaces and display screens, thereby protecting the safety of the error monitoring device 100 of the electric energy meter.

[0108] This application obtains the pulse data of the energy meter through RS485 communication and pulses, calculates the electric energy for a period of time, and then obtains the line current data connected to the energy meter through a mutual inductor, measures the amount of electric energy flowing through the energy meter for a period of time, and detects whether there is an error in the energy meter by comparing and analyzing the amounts of the two energy lines. The error monitoring device 100 of the energy meter of this application is innovatively expanded in function to solve the problem of inaccurate error monitoring of the energy meter in the prior art. After the implementation of this project, it can be applied to the energy meter on the customer side, with a wide range of applications, solving the problem of on-site inspection of the energy meter, improving work efficiency, reducing operation and maintenance costs, improving monitoring benefits, and reducing on-site operation risks. Compared with the intelligent analysis module of the prior art, this application does not need to collect data to train the model, and can collect various data of the energy meter 40 under test in real time to monitor and accurately judge the errors of the energy meter 40 under test in real time, and can be carried portable to cope with various emergency monitoring scenarios, and is flexible to use.

[0109] The error monitoring device 100 of the electric energy meter of the present application can improve portability and transportation convenience: compared with the traditional three-phase electric energy meter calibrator, the error monitoring device 100 of the electric energy meter is smaller in size, easy to transport and carry, and the built-in battery does not require additional power supply equipment, which solves the problem that the traditional inspection device is large in size and inconvenient to carry and transport.

[0110] The error monitoring device 100 of the electric energy meter of the present application can save resources and improve work efficiency: the device sends command lines and collects pulses to the terminal through RS485 communication to obtain the electric energy meter data for inspection. It does not need to occupy grid resources and only requires one operator to complete the entire process, greatly reducing the occupation of power resources and human resources.

[0111] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0112] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An error monitoring device for an electric energy meter, characterized in that: The error monitoring device of the electric energy meter comprises: a pulse counting module, a mutual inductor module and a data processing module, all of which are connectable to the electric energy meter under test; The data processing module is connected to the pulse counting module and is used to count the pulses emitted by the electric energy meter under test through the pulse counting module; The data processing module is connected to the transformer module and is used to obtain the line current of the electric energy meter line of the electric energy meter under test through the transformer module; The data processing module is further used to read the internal data of the electric energy meter under test, wherein the internal data includes the metering current and the metering voltage measured by the electric energy meter under test; The data processing module is also used to calculate the first electric energy of the electric energy meter under test within a preset time period based on the line current and the metering voltage, calculate the second electric energy of the electric energy meter under test based on the number of pulses within the preset time period and the internal data, and determine whether there is an error in the electric energy meter under test based on the difference between the first electric energy and the second electric energy.

2. The error monitoring device for an electric energy meter according to claim 1, characterized in that: The pulse counting module comprises a pulse input module, a pulse analysis module and an RS232 circuit module which are electrically connected in sequence, the input end of the pulse input module is connected to the electric energy meter under test, and the output end of the RS232 circuit module is connected to the input end of the data processing module; The pulse input module is used to perform high-frequency voltage conversion on the original pulse data obtained from the electric energy meter under test to obtain a pulse conversion output signal; The pulse analysis module is used to convert the pulse conversion output signal into a pulse digital signal; The RS232 circuit module is used to convert the pulse digital signal into a first TTL digital signal, and input the first TTL digital signal to the data processing module; The data processing module is specifically used to obtain the number of pulses according to the first TTL digital signal.

3. The error monitoring device for an electric energy meter according to claim 1, characterized in that: The mutual inductor module is used to obtain the mutual inductance current of the electric energy meter circuit of the electric energy meter under test, convert the mutual inductance current into a first digital signal and transmit it to the data processing module; The data processing module is used to convert the first digital signal into the line current of the electric energy meter circuit of the tested electric energy meter.

4. The error monitoring device for an electric energy meter according to claim 3, characterized in that: The mutual inductor module includes a mutual inductor and a differential analog input conversion module; The mutual inductor is connected to the electric energy meter circuit of the electric energy meter under test, and is used to obtain the mutual inductance current of the electric energy meter circuit through mutual inductance; The differential analog quantity input conversion module is used to convert the mutual inductance current into a first digital signal; The data processing module specifically obtains the first digital signal from the differential analog input conversion module through RS485 communication mode and MODBUS communication protocol.

5. The error monitoring device for an electric energy meter according to claim 1, characterized in that: The data processing module specifically obtains the digital input signal of the electric energy meter under test through the 485 communication module, and the 485 communication module is also used to convert the digital input signal into a second TTL digital signal, and input the second TTL digital signal to the data processing module; The data processing module is specifically used to obtain internal data corresponding to the tested electric energy meter according to the second TTL digital signal.

6. The error monitoring device for an electric energy meter according to claim 1, characterized in that: The internal data also includes metered electrical energy; The data processing module is specifically used to determine the number of pulses emitted by the measured electric energy meter per unit of electric energy consumed based on the distribution of the measured electric energy and the number of pulses, and calculate the second electric energy of the measured electric energy meter based on the number of pulses within the preset time period and the number of pulses emitted by the measured electric energy meter per unit of electric energy consumed.

7. The error monitoring device for an electric energy meter according to claim 1, characterized in that: The error monitoring device of the electric energy meter also includes a device body, and the pulse counting module, the transformer module, and the data processing module are all installed in the device body, and the electric pulse interface of the pulse counting module can be connected to the external electric energy meter under test through the first opening of the device body, the transformer interface of the transformer module can be connected to the electric energy meter under test through the second opening of the device body, and the communication interface of the data processing module can be connected to the electric energy meter under test through the third opening of the device body.

8. The error monitoring device for an electric energy meter according to claim 7, characterized in that: The error monitoring device of the electric energy meter further comprises a power module installed in the device body, the power module is used to convert the input voltage into a target output voltage to supply power to other modules; The power port of the power module can be connected to an external power source through the fourth opening of the device body; The power button of the power module is exposed to the outer surface of the device body through the fifth opening of the device body.

9. The error monitoring device for an electric energy meter according to claim 7, characterized in that: The error monitoring device of the electric energy meter also includes a display module; The display screen included in the display module is installed on the upper end surface of the device body, and the upper end surface at least includes at least one opening among the first opening, the second opening, the third opening, the fourth opening and the fifth opening.

10. The error monitoring device for an electric energy meter according to claim 7, characterized in that: The error monitoring device of the electric energy meter also includes a protective cover, one side of which is movably connected to one side of the upper end surface of the device body, and the protective cover can be flipped over to cover the device body; alternatively, the protective cover can cover the upper end surface of the device body or be removed from the upper end surface; wherein the upper end surface includes at least one of the first opening, the second opening, the third opening, the fourth opening and the fifth opening.

Images