Electric energy meter calibration system
By introducing an anti-interference signal processing module and a timed capture module into the electricity meter calibration system, the problem of electricity meter calibration equipment being susceptible to interference has been solved, achieving higher calibration accuracy and precision.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-04-07
AI Technical Summary
Existing electricity meter calibration equipment is susceptible to interference, resulting in inaccurate calibration.
An anti-interference signal processing module, including an RC low-pass filter circuit, a Schmitt trigger, and an opto-isolator, is used to filter out power frequency interference and electromagnetic noise, and to perform pulse shaping and electrical isolation. Combined with a timing capture module and a line redundancy module, this ensures the accuracy and reliability of data acquisition.
This improves the accuracy and precision of electricity meter verification, avoids miscounting caused by interference, and ensures the smooth progress of the verification process.
Smart Images
Figure CN121805934A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electricity meter verification technology, and in particular to an electricity meter verification system. Background Technology
[0002] Power grid meters and related equipment may experience operational errors and malfunctions during long-term operation. Therefore, it is necessary to calibrate power grid meters and related equipment so that operators can quickly, safely and reliably measure meter errors and wiring mistakes, providing a valid basis for power system metering personnel to accurately measure and supplement electricity consumption.
[0003] Existing electricity meter calibration equipment is susceptible to interference from various factors, resulting in inaccurate meter calibration. Summary of the Invention
[0004] To address the problems existing in the prior art, this invention provides an electricity meter verification system that can eliminate some interference factors through an anti-interference signal processing module before verifying the electricity meter data, thereby improving the accuracy of the verification. The specific technical solution is as follows: An energy meter calibration system includes a central control module, a pulse capture module, an anti-interference signal processing module, a standard energy meter, an energy meter under test, and an error calculation module; The pulse capture module is used to acquire the pulse signal of the tested energy meter; the anti-interference signal processing module is used to receive the pulse signal and perform anti-interference processing on the pulse signal; the error calculation module calculates the error between the tested energy meter and the standard energy meter through the pulse signal to realize the verification of the energy meter; the central control module is used to control the working status of the central control module, pulse capture module, anti-interference signal processing module, standard energy meter and error calculation module.
[0005] Preferably, the anti-interference signal processing module includes an RC low-pass filter circuit, a Schmitt trigger, and an opto-isolator; The RC low-pass filter circuit is used to filter out power frequency interference and electromagnetic noise mixed in with the pulse signal during transmission; The Schmitt trigger is used to shape the filtered pulse, converting irregular waveforms into standard square wave pulses. The opto-isolator is used for electrical isolation between strong and weak currents.
[0006] Preferably, the anti-interference signal processing module further includes a timed pulse capture module, which is signal-connected to the central control module and is used to capture pulse signals at regular intervals.
[0007] Preferably, the anti-interference signal processing module further includes a de-jitter delay module, which is signal-connected to the central control module. The de-jitter delay module is used to avoid false counting caused by signal jitter.
[0008] Preferably, the anti-interference signal processing module further includes an overflow processing module, which is used to provide overflow protection.
[0009] Preferably, it also includes a storage module for storing data from the overflow module.
[0010] Preferably, it also includes a line redundancy module, which is connected to the pulse capture module and the signal of the energy meter under test.
[0011] Preferably, the standard energy meter includes a standard energy metering module, and the energy meter under test includes an energy metering module; both the standard energy metering module and the energy metering module are signal-connected to the error calculation module.
[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the anti-interference signal processing module filters power frequency interference and electromagnetic noise, shapes the filtered pulse signal, and electrically isolates strong and weak currents to ensure the accuracy of the collected data from the energy meter under test and improve the accuracy of the verification.
[0013] 2. In this invention, the pulse capture module can be used to collect pulses from the energy meter under test at regular intervals, avoiding data collection under external interference and improving data accuracy.
[0014] 3. In this invention, by setting up a line redundancy module, it is possible to switch to another line for pulse capture when one line has a problem, thus ensuring the smooth operation of the electricity meter verification work. Attached Figure Description
[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0016] Figure 1 This is a system schematic diagram of the present invention; Detailed Implementation The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0018] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0019] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0020] Example: Please see Figure 1 An energy meter verification system includes a central control module, a pulse capture module, an anti-interference signal processing module, a standard energy meter, an energy meter under test, and an error calculation module. The pulse capture module acquires pulse signals from the energy meter under test. The anti-interference signal processing module receives the pulse signals and performs anti-interference processing on them. The error calculation module calculates the error between the energy meter under test and the standard energy meter using the pulse signals, thus verifying the energy meter. The central control module controls the operating status of the central control module, pulse capture module, anti-interference signal processing module, standard energy meter, and error calculation module.
[0021] In the above scheme, the central control module uses an STM32 series microcontroller, the pulse capture module uses an optocoupler, and the error calculation module uses an error calculation processor. The central control module can control the pulse capture module, the anti-interference signal processing module, the standard energy meter, and the error calculation module to acquire the pulse signal from the energy meter under test, and verify the data from the standard energy meter with the data from the energy meter under test. The verification process is as follows: The formula for calculating the relative error of an electricity meter is: in, The measured electrical energy value of the meter under test. This represents the theoretical electrical energy output from the standard source.
[0022] Calculation method: Instantaneous power is calculated by synchronously sampling voltage and current values, and the theoretical electrical energy is obtained by integration. in, Here, t represents the power factor, and t represents the calibration time.
[0023] Acquisition method: The pulse count of the meter under test is collected using a photoelectric sampler. Combined with the electricity meter constant C (pulse count / kWh), calculate .
[0024] Continue reading Figure 1 The anti-interference signal processing module includes an RC low-pass filter circuit, a Schmitt trigger, and an opto-isolator; The RC low-pass filter circuit is used to filter out power frequency interference and electromagnetic noise mixed in during the transmission of pulse signals. Specifically, pulse signals are prone to power frequency interference and electromagnetic noise during transmission, and RC low-pass filter circuits or active filter circuits are required to filter out high-frequency noise.
[0025] The Schmitt trigger is used to shape the filtered pulse, converting the irregular waveform into a standard square wave pulse. Specifically, the filtered pulse may have problems such as rising / falling edge jitter and insufficient amplitude, which need to be shaped by a Schmitt trigger (such as a 74HC14 chip) to convert the irregular waveform into a standard square wave pulse. The opto-isolator is used to electrically isolate strong and weak currents. Specifically, to prevent interference or surges on the strong side from damaging the weak current acquisition circuit, an opto-isolator (such as 6N137) can be added to the conditioning circuit to achieve electrical isolation between strong and weak currents, thereby improving the system's anti-interference and safety.
[0026] As a further embodiment, the anti-interference signal processing module also includes a timed pulse capture module, which is signal-connected to the pulse capture module and the central control module. The timed pulse capture module is used to capture pulse signals at regular intervals, avoiding false counting caused by signal jitter and ensuring the real-time performance of power calculation.
[0027] As a further embodiment, the anti-interference signal processing module also includes a de-jitter delay module, which is signal-connected to the pulse capture module and the central control module. The de-jitter delay module is used to avoid false counting caused by signal jitter.
[0028] As a further embodiment, the anti-interference signal processing module also includes an overflow processing module, which provides overflow protection. Additionally, the overflow processing module is connected to a storage module for storing data from the overflow module. The storage module can be a non-volatile memory, such as EEPROM or Flash, to prevent data loss due to power failure.
[0029] Furthermore, a line redundancy module is also included. The line redundancy module is connected to the pulse capture module and the signal of the energy meter under test. By setting up the line redundancy module, when one line has a problem, the pulse capture can be switched to another line, which ensures the smooth operation of the energy meter verification.
[0030] As a further embodiment, the standard energy meter includes a standard energy metering module, and the energy meter under test includes an energy metering module; both the standard energy metering module and the energy metering module are signal-connected to the error calculation module. The standard energy metering module and the energy metering module respectively perform energy metering and simultaneously transmit the metering results to the error calculation processor, which calculates the metering error of the standard energy metering module and the energy metering module.
[0031] Those skilled in the art will recognize that the units of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the invention.
[0032] In the embodiments provided by the present invention, it should be understood that the division of units is only a logical functional division. In actual implementation, there may be other division methods, such as multiple units can be combined into one unit, one unit can be split into multiple units, or some features can be ignored.
[0033] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0034] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.
[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.
Claims
1. An electricity meter calibration system, characterized in that, It includes a central control module, a pulse capture module, an anti-interference signal processing module, a standard energy meter, a measured energy meter, and an error calculation module; The pulse capture module is used to acquire the pulse signal of the tested energy meter; the anti-interference signal processing module is used to receive the pulse signal and perform anti-interference processing on the pulse signal; the error calculation module calculates the error between the tested energy meter and the standard energy meter through the pulse signal to realize the verification of the energy meter; the central control module is used to control the working status of the central control module, pulse capture module, anti-interference signal processing module, standard energy meter and error calculation module.
2. The electricity meter verification system according to claim 1, characterized in that, The anti-interference signal processing module includes an RC low-pass filter circuit, a Schmitt trigger, and an opto-isolator. The RC low-pass filter circuit is used to filter out power frequency interference and electromagnetic noise mixed in with the pulse signal during transmission; The Schmitt trigger is used to shape the filtered pulse, converting irregular waveforms into standard square wave pulses. The opto-isolator is used for electrical isolation between strong and weak currents.
3. The electricity meter verification system according to claim 1, characterized in that, The anti-interference signal processing module also includes a timed pulse capture module, which is connected to the central control module and is used to capture pulse signals at regular intervals.
4. The electricity meter verification system according to claim 1, characterized in that, The anti-interference signal processing module also includes a de-jitter delay module, which is signal-connected to the central control module. The de-jitter delay module is used to avoid false counting caused by signal jitter.
5. The electricity meter verification system according to claim 1, characterized in that, The anti-interference signal processing module also includes an overflow processing module, which provides overflow protection.
6. The electricity meter calibration system according to claim 5, characterized in that, It also includes a storage module for storing data from the overflow module.
7. The electricity meter verification system according to claim 1, characterized in that, It also includes a line redundancy module, which is connected to the pulse capture module and the signal of the energy meter under test.
8. The electricity meter verification system according to claim 1, characterized in that, The standard energy meter includes a standard energy metering module, and the energy meter under test includes an energy metering module; both the standard energy metering module and the energy metering module are signal-connected to the error calculation module.