Smart Energy Meter

Abstract

The present invention relates to an intelligent electric energy meter, comprising a signal feedback module, a conversion module, a signal sampling module, a metering monitoring module and a processor; a first electric signal is input into the conversion module through the signal feedback module; the signal sampling module collects a second electric signal output by the conversion module, and transmits the second electric signal to the metering monitoring module; the metering monitoring module obtains the first electric signal and the second electric signal, calculates a target output electric signal according to the first electric signal, and compares and processes the second electric signal with the target output electric signal to generate an error check parameter; the processor detects a metering error inaccuracy fault according to a comparison result between the error check parameter and a standard check parameter, so as to realize real-time monitoring and self-diagnosis of the metering error while the intelligent electric energy meter measures the mains electric energy, without affecting the function and appearance structure of the existing intelligent electric energy meter, saving detection costs, and being convenient and simple to install.

Description

Technical Field

[0001] The invention relates to the field of instrument measurement, and in particular to an intelligent electric energy meter. Background Art

[0002] An electric energy meter is an instrument used to measure electric energy. A smart electric energy meter is an instrument that uses a microprocessor or microcontroller chip as its core, stores a large amount of measurement information, and has the ability to analyze, process and make judgments on the measurement results in real time, providing accurate measurement of actual electric energy.

[0003] With the long-term use of electric energy meters, electric energy meters will produce errors and need to be tested regularly. The electric energy measurement errors of traditional smart electric energy meters are detected by external dedicated error detection devices. In particular, smart electric energy meters that have been installed on-site must be regularly disassembled and returned to the factory or tested on-site with dedicated error detection devices, which consumes a lot of manpower and material resources, and cannot monitor the error tolerance of smart electric energy meters in real time. Summary of the invention

[0004] Based on this, it is necessary to provide a smart energy meter to address the problem of being unable to monitor the measurement error of the smart energy meter in real time.

[0005] The embodiment of the present invention provides a smart electric energy meter, characterized by comprising: a signal feedback module, a conversion module, a signal sampling module, a metering monitoring module and a processor;

[0006] The signal feedback module is connected to the input end of the conversion module, and the signal feedback module inputs a first electrical signal to the conversion module;

[0007] The input end of the signal sampling module is connected to the output end of the conversion module, the signal sampling module collects the second electrical signal output by the conversion module, and transmits the second electrical signal to the metering monitoring module;

[0008] The metering monitoring module is connected to the output end of the signal feedback module and the output end of the signal sampling module, and is used to obtain the first electrical signal and the second electrical signal, calculate the target output electrical signal according to the first electrical signal, and compare and process the second electrical signal and the target output electrical signal to generate an error check parameter, and transmit the error check parameter to the processor. The target output electrical signal is the theoretical output electrical signal corresponding to the first electrical signal after being processed by the conversion module;

[0009] The processor is connected to the metering monitoring module and is used to detect metering error inaccuracy faults based on comparison results between the error calibration parameters and the standard calibration parameters.

[0010] In one embodiment, the conversion module includes a voltage conversion unit, the signal feedback module includes a voltage feedback unit, and the signal sampling module includes a voltage sampling unit;

[0011] The voltage feedback unit is connected to the input end of the voltage conversion unit, and the voltage feedback unit inputs a first voltage signal of a first set frequency to the voltage conversion unit;

[0012] The input end of the voltage sampling unit is connected to the output end of the voltage conversion unit. The voltage sampling unit collects the second voltage signal output by the voltage conversion unit and outputs the second voltage signal to the metering monitoring module.

[0013] In one embodiment, the conversion module includes a current conversion unit, the signal feedback module includes a current feedback unit, and the signal sampling module includes a current sampling unit;

[0014] The current feedback unit is connected to the input end of the current conversion unit, and the current feedback unit inputs a first current signal of a second set frequency to the current conversion unit;

[0015] The input end of the current sampling unit is connected to the output end of the current conversion unit. The current sampling unit collects the second current signal output by the current conversion unit and outputs the second current signal to the metering monitoring module.

[0016] In one of the embodiments, the metrology monitoring module includes a signal detection unit and an error monitoring unit;

[0017] The signal detection unit is connected to the output end of the signal feedback module and the output end of the signal sampling module respectively, and is used to obtain the first electrical signal and the second electrical signal, obtain the target output electrical signal according to the first electrical signal, and output the target output electrical signal and the second electrical signal to the error monitoring unit;

[0018] The error monitoring unit is connected to the signal detection unit, and is used for comparing the second electrical signal with the target output electrical signal, generating an error checking parameter, and transmitting the error checking parameter to the processor.

[0019] In one embodiment, the voltage conversion unit includes a resistor network.

[0020] In one embodiment, the current conversion unit includes a manganese-copper resistor or a current transformer.

[0021] In one of the embodiments, it further includes: a communication module;

[0022] The communication module is connected to the processor, and is used to receive the measurement error inaccuracy fault information sent by the processor, and transmit the measurement error inaccuracy fault information to the terminal device.

[0023] In one embodiment, the communication module includes one or more of an infrared communication unit, an RS485 communication unit, and a carrier communication unit.

[0024] In one of the embodiments, it also includes a relay protection module;

[0025] The relay protection module is connected to the processor;

[0026] The processor is also used to control the relay protection module to perform power-off protection.

[0027] In one embodiment, it also includes a display module;

[0028] The display module is connected to the processor and is used to display information according to the signal output by the processor.

[0029] The above embodiment provides a smart electric energy meter, which inputs a first electric signal to a conversion module through a signal feedback module, collects a second electric signal output by the conversion module, processes the second electric signal and the target output electric signal to generate an error check parameter, and compares the error check parameter with the standard check parameter to detect the metering error inaccuracy fault, so as to realize real-time monitoring and self-diagnosis of the metering error while the smart electric energy meter measures the mains electricity, without affecting the function and appearance structure of the existing smart electric energy meter, saving detection costs, and convenient and simple installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a first structural schematic diagram of a smart electric energy meter provided by an embodiment of the present invention;

[0031] Figure 2 is a second structural schematic diagram of a smart electric energy meter provided by an embodiment of the present invention;

[0032] Figure 3 is a third structural schematic diagram of a smart electric energy meter provided by an embodiment of the present invention;

[0033] Figure 4 This is a fourth structural schematic diagram of a smart electric energy meter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and integrated therewith, or there may be a centering element at the same time. The term "comprising" and any variation thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or (module) units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The term "multiple" as used herein refers to two or more than two. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0039] Figure 1 is a first structural schematic diagram of a smart electric energy meter provided by an embodiment of the present invention, such as Figure 1 As shown, the smart electric energy meter includes: a signal feedback module 110 , a conversion module 120 , a signal sampling module 130 , a metering monitoring module 140 and a processor 150 .

[0040] The signal feedback module 110 is connected to the input end of the conversion module 120, and the signal feedback module 110 inputs a first electrical signal to the conversion module 120; the input of the signal sampling module 130 is connected to the output end of the conversion module 120, and the signal sampling module 130 collects a second electrical signal output by the conversion module 120, and transmits the second electrical signal to the metering monitoring module 140; the metering monitoring module 140 is connected to the output end of the signal feedback module 110 and the output end of the signal sampling module 130, and is used to obtain the first electrical signal and the second electrical signal, obtain the target output electrical signal according to the first electrical signal, and compare and process the second electrical signal and the target output electrical signal, generate an error check parameter, and transmit the error check parameter to the processor 150, the target output electrical signal is a theoretical output electrical signal corresponding to the first electrical signal; the processor 150 is connected to the metering monitoring module 140, and is used to detect a metering error inaccuracy fault according to the comparison result of the error check parameter and the standard check parameter.

[0041] The smart electric energy meter includes a voltage channel and a current channel. The metering error inaccuracy fault of the smart electric energy meter is determined by detecting the metering error of the voltage channel and the metering error of the current channel of the smart electric energy meter.

[0042] In an embodiment, according to the type of signal detection, there may be one or more signal feedback modules 110, conversion modules 120 and signal sampling modules 130. For example, when only the metering error of the voltage channel or the current channel is detected, there may be only one signal feedback module 110, one conversion module 120 or one signal sampling module 130. When detecting the metering error of the voltage channel and the current channel, two or more signal feedback modules 110, conversion modules 120 and signal sampling modules 130 may be included to detect the voltage channel and the current channel respectively. Of course, when only the metering error of the voltage channel or the current channel is detected, multiple signal feedback modules 110, conversion modules 120 and signal sampling modules 130 may also be included to perform multiple measurements on the detected voltage channel or the current channel respectively.

[0043] The signal feedback module 110 is used to input a test electrical signal, i.e., a first electrical signal, to the conversion module 120. The first electrical signal includes a voltage signal and a current signal. In an embodiment, the conversion module 120 can also be connected to the mains power grid to convert the electrical signal input from the mains power grid. The second electrical signal includes an actual output electrical signal corresponding to the first electrical signal after being processed by the conversion module 120 and / or an actual output electrical signal corresponding to the electrical signal input from the mains power grid after being processed by the conversion module. For example, when the smart electric energy meter is connected to the mains power grid for electric energy metering, the second electrical signal is a mixed electrical signal of the first electrical signal and the electrical signal input from the mains power grid after being processed by the conversion module. If the smart electric energy meter is not connected to the mains power grid for error diagnosis, the second electrical signal at this time is the actual output electrical signal of the first electrical signal after being processed by the conversion module.

[0044] The conversion module 120 is used to divide the voltage or current of the first electrical signal or the electrical signal input from the mains power grid. Depending on the type of the input electrical signal, the conversion module 120 can be a voltage transformer, a current transformer, a resistor network, a manganese copper resistor, etc.

[0045] The signal sampling module 130 is used to sample the electrical signal processed by the conversion module 120. The measurement monitoring module 140 compares the electrical signal collected by the signal sampling module 130 with the target output electrical signal to obtain an error check parameter, wherein the error check parameter reflects the attenuation condition of the target output electrical signal.

[0046] It should be noted that when the second electrical signal is a mixed electrical signal of the first electrical signal and the electrical signal input from the mains power grid after being processed by the conversion module, the first electrical signal is separated from the second electrical signal and processed by the conversion module to be the actual output electrical signal. In an embodiment, the signal frequency of the first electrical signal is different from the signal frequency of the electrical signal input from the mains power grid, thereby achieving separation of the first electrical signal from the mixed electrical signal and processing the actual output electrical signal of the first electrical signal after being processed by the conversion module. Optionally, an electrical signal of a set frequency can be extracted based on the difference in signal frequency between the electrical signal at the mains power grid input end and the first electrical signal in the mixed electrical signal, wherein the set frequency is the same as the signal frequency of the first electrical signal.

[0047] The metering monitoring module in the embodiment includes a chip with metering and processing functions and its peripheral circuits, such as metering chips such as RN8209C, ADE9153A, and ADE7752A. The error check parameter is obtained based on the actual output electrical signal and the target output electrical signal processed by the conversion module corresponding to the first electrical signal. In an embodiment, the error check parameter = the actual output electrical signal / target output electrical signal processed by the conversion module corresponding to the first electrical signal. For example, in the voltage channel, the first electrical signal is 5V, the actual output electrical signal processed by the conversion module corresponding to the first electrical signal is 0.8V, and the target output electrical signal is 1V. At this time, the error check parameter is 0.8 / 1=80%. Similarly, in the current channel, the first electrical signal is 5A, the actual output electrical signal processed by the conversion module corresponding to the first electrical signal is 0.8A, and the target output electrical signal is 0.8A. At this time, the error check parameter is 0.8 / 0.8=100%.

[0048] The standard calibration parameter refers to the factory original parameter. According to the comparison result of the error calibration parameter and the standard calibration parameter, the error value is obtained. Therefore, the error value in this embodiment is the error value corresponding to the factory original parameter. In the embodiment, the error value is equal to the difference between the error calibration parameter and the standard calibration parameter. Optionally, the acquisition of the error value can be achieved by a subtractor, or by other logic circuits that realize subtraction or comparison functions, or by a computer program.

[0049] According to the example of the above embodiment, the error check parameter of the voltage channel is 80%, and the standard check parameter of the voltage channel is 100%. At this time, the error value of the voltage channel is 80%-100%=-20%, the error check parameter of the current channel is 100%, and the standard check parameter of the current channel is 100%. At this time, the error value of the current channel is 100%-100%=0. At this time, according to the detection result of the error value, it can be known that the voltage channel of the smart electric energy meter has a measurement error inaccuracy, and its error value is -20%, while there is no measurement error inaccuracy in the current channel.

[0050] The smart energy meter provided in this embodiment inputs a first electrical signal to a conversion module through a signal feedback module, collects a second electrical signal output by the conversion module, processes the second electrical signal and a target output electrical signal to generate an error check parameter, and compares the error check parameter with a standard check parameter to detect a metering error inaccuracy fault, so as to achieve real-time monitoring and self-diagnosis of the metering error while the smart energy meter measures city power, without affecting the function and appearance structure of the existing smart energy meter, saving detection costs, and facilitating and simplifying installation.

[0051] like Figure 2 As shown, in one embodiment, the conversion module 120 includes a voltage conversion unit 121 , the signal feedback module 110 includes a voltage feedback unit 111 , and the signal sampling module 130 includes a voltage sampling unit 131 .

[0052] The voltage feedback unit 111 is connected to the input end of the voltage conversion unit 121, and the voltage feedback unit 111 inputs a first voltage signal of a first set frequency to the voltage conversion unit 121; the input end of the voltage sampling unit 131 is connected to the output end of the voltage conversion unit 121, and the voltage signal sampling unit 131 collects a second voltage signal output by the voltage conversion unit 121, and outputs the second voltage signal to the metering monitoring module 140.

[0053] The voltage conversion unit 121 is used to perform voltage division processing on the input voltage signal, and convert the strong voltage signal into a weak voltage signal to facilitate sampling by the voltage sampling unit 131. In the embodiment, the strong voltage signal includes a mains voltage signal, a first voltage signal, or a mixed signal of the mains voltage signal and the first voltage signal. The voltage feedback unit 111 is used to inject a voltage test signal, i.e., a first voltage signal, into the voltage conversion unit 121 on the voltage channel of the smart electric energy meter. The second voltage signal includes an actual output voltage signal and / or a mains voltage signal corresponding to the first voltage signal. Specifically, in one embodiment, the mains power grid and the voltage feedback unit simultaneously input voltage signals to the voltage conversion unit, at which time, the second voltage signal output by the voltage conversion unit 121 is a mixed voltage signal of the actual output voltage signal corresponding to the mains voltage signal and the first voltage signal. In one embodiment, only the voltage feedback unit 111 inputs a voltage signal to the voltage conversion unit 121, at which time the second voltage signal output by the voltage conversion is the actual output voltage signal corresponding to the first voltage signal.

[0054] It should be noted that the first set frequency is any set frequency different from the AC power frequency, so that when the second voltage signal is a mixed signal of the AC power voltage signal and the actual output voltage signal corresponding to the first voltage signal, it is convenient to separate the actual output voltage signal corresponding to the first voltage signal from the mixed voltage signal.

[0055] In one embodiment, the conversion module 120 includes a current conversion unit 122 , the signal feedback module 110 includes a current feedback unit 112 , and the signal sampling module 130 includes a current sampling unit 132 ;

[0056] The current feedback unit 112 is connected to the input end of the current conversion unit 122, and the current feedback unit 112 inputs the first current signal of the second set frequency to the current conversion unit 122; the input end of the current sampling unit 132 is connected to the output end of the current conversion unit 122, and the current sampling unit 132 collects the second current signal output by the current conversion unit 122, and outputs the second current signal to the metering monitoring module 140.

[0057] The current conversion unit 122 is used to shunt the input current signal and convert the strong current signal into a weak current signal to facilitate sampling by the current sampling unit 132. In an embodiment, the strong current signal includes a mains current signal, a first current signal, or a mixed signal of the mains current signal and the first current signal. The current feedback unit 112 is used to inject a current test signal, i.e., a first current signal, into the current conversion unit on the current channel of the smart electric energy meter. The second current signal includes an actual output current signal and / or a mains current signal corresponding to the first current signal. Specifically, in one embodiment, the mains power grid and the current feedback unit simultaneously input current signals to the current conversion unit 122, at which time the second current signal output by the current conversion unit 122 is a mixed current signal of the mains current signal and the actual output current signal corresponding to the first current signal. In one embodiment, only the current feedback unit 112 inputs a current signal to the current conversion unit 122, at which time the second current signal output by the current conversion is the actual output current signal corresponding to the first current signal.

[0058] It should be noted that the second set frequency is any set frequency different from the AC power frequency, so that when the second current signal is a mixed signal of the AC power current signal and the actual output current signal corresponding to the first current signal, it is convenient to separate the actual output current signal corresponding to the first current signal from the mixed current signal.

[0059] It should also be noted that the first set frequency and the second set frequency can be the same frequency or different frequencies. For example, if the mains frequency is 50 Hz and the first set frequency is 25 Hz, then the second set frequency can be 25 Hz or 15 Hz.

[0060] like Figure 3As shown, in one embodiment, the metering monitoring module 140 includes a signal detection unit 141 and an error monitoring unit 142. The signal detection unit 141 is connected to the signal feedback module 110 and the signal sampling module 130 respectively, and is used to obtain the first electrical signal and the second electrical signal, obtain the target output electrical signal according to the first electrical signal, and output the target output electrical signal and the second electrical signal to the error monitoring unit 142; the error monitoring unit 142 is connected to the signal detection unit 141, and is used to compare the second electrical signal with the target output electrical signal, generate an error check parameter, and transmit the error check parameter to the processor 150.

[0061] In this embodiment, two signal channels are respectively derived from the signal detection unit 141, one signal channel is connected to the signal feedback module 110 to obtain the first electrical signal, and the other signal channel is connected to the signal sampling module 130 to obtain the second electrical signal. After the signal detection unit 141 obtains the first electrical signal, according to the set proportional rule, the theoretical output value corresponding to the first electrical signal under normal circumstances is calculated according to the size of the first electrical signal. The normal situation refers to the situation where there is no metering error or inaccuracy. It can be a relative concept and can be determined relative to the metering data of the smart electric energy meter when it leaves the factory. For example, the set proportional rule is to input the first electrical signal: the theoretical output value corresponding to the first electrical signal under normal circumstances = 5:1. According to the proportional rule, the target output electrical signal of a predetermined ratio is obtained by the existing circuit at any input first electrical signal.

[0062] Among them, the second electrical signal can be the actual output electrical signal corresponding to the first electrical signal. In this case, the second electrical signal is equal to the actual output electrical signal corresponding to the first electrical signal. The first electrical signal can also be a mixed electrical signal of the actual output electrical signal corresponding to the mains and the actual output electrical signal corresponding to the first electrical signal. In this case, when the error monitoring unit 142 compares the second electrical signal with the target output electrical signal, it is also necessary to separate the actual output electrical signal corresponding to the first electrical signal from the mixed electrical signal and then compare it with the target output signal. Optionally, the error parameter can be the ratio of the actual output electrical signal corresponding to the first electrical signal to the target output electrical signal, or the ratio of the target output electrical signal to the actual output electrical signal corresponding to the first electrical signal.

[0063] In one embodiment, the voltage conversion unit includes a resistor network.

[0064] In an embodiment, the resistor network includes a plurality of resistors integrated together in a predetermined connection mode, and the strong voltage signal is converted into a weak voltage signal through the resistor network, so as to facilitate voltage sampling of the voltage sampling unit.

[0065] In one embodiment, the current conversion unit includes a manganese-copper resistor or a current transformer.

[0066] Smart energy meters include single-phase smart energy meters and three-phase smart energy meters. In a single-phase smart energy meter, the current conversion unit includes a manganese copper resistor, which converts a strong current signal into a weak current signal, which is convenient for current sampling by a current sampling unit. In a three-phase smart energy meter, the current conversion unit includes a current transformer, which converts a strong current signal into a weak current signal, which is convenient for current sampling by a current sampling unit.

[0067] like Figure 4 As shown, in one embodiment, the smart electricity meter also includes: a communication module 160; the communication module 160 is connected to the processor 150, and is used to receive the metering error misalignment fault information sent by the processor 150, and transmit the metering error misalignment fault information to the terminal device.

[0068] In the embodiment, the processor 150 is connected to the terminal device through the communication module 160. The communication module 160 includes a communication chip and a peripheral circuit. The communication module 160 is used for data information communication between the processor 150 and the external terminal device, and can be connected to the terminal device in a wired or wireless manner to realize the interaction of data signals between the processor and the terminal device. For example, the processor 150 sends metering error misalignment fault information to the communication module 160, and the communication module 160 receives the metering error misalignment fault information and sends it to the terminal device, such as the server main station, for data analysis on the terminal device or to alarm the terminal device to remind the user that the smart energy meter has a metering error misalignment fault.

[0069] In one embodiment, the communication module 160 includes one or more of an infrared communication unit, an RS485 communication unit, and a carrier communication unit.

[0070] The communication module 160 includes a wired communication module and a wireless communication module. The wireless communication module includes an infrared communication unit, etc., and the wired communication module includes an RS485 communication unit and a carrier communication unit, etc. The infrared communication unit uses infrared to transmit data information. The carrier communication unit uses existing power lines to transmit data information at high speed through a carrier. The RS485 communication unit uses an RS485 bus to transmit data information. In an embodiment, the communication module specifically uses which communication method or methods to transmit data information to be set according to actual conditions.

[0071] Continue to refer Figure 4 In one embodiment, the smart energy meter further includes a relay protection module 170; the relay protection module 170 is connected to the processor 150; the processor 150 is also used to control the relay protection module 170 to perform power-off protection.

[0072] The relay protection module 170 includes a relay and a peripheral circuit. In an embodiment, the relay protection module 170 includes a pull-out relay circuit and a closing relay circuit. The relay protection module 170 implements power-off protection when an abnormality occurs in the circuit according to the processing result of the processor. For example, when the processor 150 determines that the current, voltage, power or temperature in the circuit exceeds the rated value, the relay protection module 170 is controlled to perform power-off protection and disconnect the circuit to play a protective role.

[0073] Continue to refer Figure 4 In one embodiment, the smart energy meter further includes a display module 180 ; the display module 180 is connected to the processor 150 and is used to display information according to a signal output by the processor 150 .

[0074] The display module 180 includes devices for display, such as a display screen, a digital tube, and an indicator light. In some embodiments, the processor 150 outputs a signal to the display module 180, such as the detection result of the metering error misalignment fault, and further, the error value is directly displayed through the display screen or the digital tube, and the indicator light warns of the metering error misalignment fault. In some other embodiments, the display module 180 can also display information such as the user's power consumption, the power grid status, and the status of the smart energy meter. In other embodiments, the display module 180 can also include function buttons to facilitate the review of relevant information, and the function buttons include an up-turn button, a down-turn button, and the like.

[0075] The smart energy meter provided in this embodiment may further include a memory (not shown), which is connected to the processor 150 and is used to store error-related data, power data, parameter data, etc. of the voltage channel and current channel of the smart energy meter. Optionally, the memory may be a read-only memory (ROM) or a random access memory (RAM).

[0076] The smart energy meter provided in this embodiment may further include a power supply module (not shown), which is connected to the processor 150 and is used to provide stable working power to each module of the smart energy meter through the processor 150 .

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0078] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A smart electric energy meter, characterized in that: include: Signal feedback module, conversion module, signal sampling module, measurement monitoring module and processor; The signal feedback module is connected to the input end of the conversion module, and the signal feedback module inputs a first electrical signal to the conversion module; The input end of the signal sampling module is connected to the output end of the conversion module, the signal sampling module collects the second electrical signal output by the conversion module, and transmits the second electrical signal to the metering monitoring module; The conversion module is connected to the mains power grid and is used to convert the electrical signal input from the mains power grid, wherein the second electrical signal includes an actual output electrical signal corresponding to the first electrical signal after being processed by the conversion module and an actual output electrical signal corresponding to the electrical signal input from the mains power grid after being processed by the conversion module; The second electrical signal is a mixed electrical signal of the first electrical signal and the electrical signal input from the mains power grid after being processed by the conversion module; The signal frequency of the first electrical signal is different from the signal frequency of the electrical signal input from the mains power grid; The metering monitoring module is connected to the output end of the signal feedback module and the output end of the signal sampling module, and is used to obtain the first electrical signal and the second electrical signal, obtain the target output electrical signal according to the first electrical signal, and separate the actual output electrical signal corresponding to the first electrical signal after being processed by the conversion module from the mixed electrical signal by utilizing the difference between the signal frequency of the first electrical signal and the signal frequency of the electrical signal input from the mains power grid, and then compare and process the actual output electrical signal corresponding to the first electrical signal after being processed by the conversion module with the target output electrical signal, generate an error check parameter, and transmit the error check parameter to the processor, and the target output electrical signal is the theoretical output electrical signal corresponding to the first electrical signal after being processed by the conversion module; The processor is connected to the metering monitoring module and is used to detect a metering error inaccuracy fault according to a comparison result between the error calibration parameter and a standard calibration parameter.

2. The smart electric energy meter according to claim 1, characterized in that: The conversion module includes a voltage conversion unit, the signal feedback module includes a voltage feedback unit, and the signal sampling module includes a voltage sampling unit; The voltage feedback unit is connected to the input end of the voltage conversion unit, and the voltage feedback unit inputs a first voltage signal of a first set frequency to the voltage conversion unit; The input end of the voltage sampling unit is connected to the output end of the voltage conversion unit. The voltage sampling unit collects a second voltage signal output by the voltage conversion unit and outputs the second voltage signal to the metering monitoring module.

3. The smart electric energy meter according to claim 1 or 2, characterized in that: The conversion module includes a current conversion unit, the signal feedback module includes a current feedback unit, and the signal sampling module includes a current sampling unit; The current feedback unit is connected to the input end of the current conversion unit, and the current feedback unit inputs a first current signal of a second set frequency to the current conversion unit; The input end of the current sampling unit is connected to the output end of the current conversion unit. The current sampling unit collects the second current signal output by the current conversion unit and outputs the second current signal to the metering monitoring module.

4. The smart electric energy meter according to claim 1, characterized in that: The metering monitoring module includes a signal detection unit and an error monitoring unit; The signal detection unit is connected to the output end of the signal feedback module and the output end of the signal sampling module respectively, and is used to obtain the first electrical signal and the second electrical signal, obtain the target output electrical signal according to the first electrical signal, and output the target output electrical signal and the second electrical signal to the error monitoring unit; The error monitoring unit is connected to the signal detection unit, and is used to separate the actual output electrical signal corresponding to the first electrical signal from the mixed electrical signal and compare it with the target output electrical signal, generate an error check parameter, and transmit the error check parameter to the processor.

5. The smart electric energy meter according to claim 2, characterized in that: The voltage conversion unit includes a resistor network.

6. The smart electric energy meter according to claim 3, characterized in that: The current conversion unit includes a manganese-copper resistor or a current transformer.

7. The smart electric energy meter according to any one of claims 4 to 6, characterized in that: Also includes: Communication module; The communication module is connected to the processor, and is used for receiving the measurement error misalignment fault information sent by the processor, and transmitting the measurement error misalignment fault information to the terminal device.

8. The smart electric energy meter according to claim 7, characterized in that: The communication module includes one or more of an infrared communication unit, an RS485 communication unit and a carrier communication unit.

9. The smart electric energy meter according to any one of claims 4 to 6, characterized in that: It also includes a relay protection module; The relay protection module is connected to the processor; The processor is also used to control the relay protection module to perform power-off protection.

10. The smart electric energy meter according to any one of claims 4 to 6, characterized in that: Also includes display module; The display module is connected to the processor and is used for displaying information according to the signal output by the processor.

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