Digital quantity and analog quantity voltage and current signal modular calibration device

Abstract

The invention provides a digital quantity and analog quantity voltage and current signal modular calibration device, which is characterized by comprising a digital quantity calibration module, an analog quantity calibration module and a control module, the digital quantity calibration module is used for converting an analog signal of voltage / current output by the power supply into a digital signal and calculating an angular difference and a ratio difference of the signal; the analog quantity calibration module is connected with the voltage and current boosting device, and the standard voltage and current transformer receives a high-voltage large-current analog signal output by the voltage and current boosting device and transmits the analog signal to the digital quantity calibration module; the to-be-calibrated electronic transformer is connected with the boost and current-rising device, receives a high-voltage large-current analog signal output by the boost and current-rising device, and transmits the analog signal to the digital quantity calibration module; analog signals are converted into digital signals through a digital quantity calibration module, and the angular difference and the ratio difference of the signals are calculated; and the control module is used for controlling the digital quantity and analog quantity calibration module. And the calibration capability of the distribution network electronic transformer signal is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy calibration, and in particular to a modular calibration device for digital and analog voltage and current signals. Background Art

[0002] The concept of "distribution primary and secondary integration" based on electronic transformers aims to improve the standardization and integration of distribution equipment through technological innovation, and to improve the joint debugging and testing mechanisms and requirements of primary and secondary equipment, thereby improving the operating level, operation and maintenance quality and efficiency of distribution equipment.

[0003] The electronic transformer for "primary and secondary power distribution integration" integrates a set of electronic combination sensors within the switch body to measure three-phase voltage, three-phase current, zero-sequence voltage, and zero-sequence current. The switch also includes a built-in, hot-swappable electronic sensor digitization unit (ADMU), which converts the analog voltage output of the electronic sensor into a digital signal and transmits it in FT3 format via a communication system to a data processing terminal.

[0004] With technological advancements, electronic instrument transformers (ETTs) are becoming increasingly common in distribution networks. However, existing EIT calibrators are insufficient for testing EITs in low-voltage distribution networks. In practice, the reliability and stability of the ADMU (digital conversion unit) in an EIT are lower than those of the sensor, and the ADMU calibration cycle is significantly shorter than that of traditional sensors. This results in frontline personnel often only needing to calibrate the digital output of distribution network EITs, but still having to carry a large EIT calibrator with integrated digital and analog calibration functions.

[0005] Therefore, it is necessary to consider the modular design of digital and analog calibration functions to ensure that front-line staff can choose the distribution network calibrator function according to actual work needs and realize lightweight office needs. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a modular calibration device for digital and analog voltage and current signals, comprising: a digital calibration module, an analog calibration module, and a control module; wherein,

[0007] A digital calibration module is used to convert the analog voltage / current signal output by the high-precision power supply into a digital signal, compare the digital signal with the digital signal output by the electronic transformer to be calibrated, and calculate the angular difference and ratio difference of the voltage / current signal output by the high-precision power supply; and transmit the angular difference and ratio difference to the control module;

[0008] The analog quantity calibration module is connected to the boost and current rising device, and the standard voltage and current transformer receives the high voltage and high current analog signal output by the boost and current rising device and matched with the rated value of the electronic transformer to be calibrated, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the electronic transformer to be calibrated is connected to the boost and current rising device, receives the high voltage and high current analog signal output by the boost and current rising device, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the high voltage and high current analog signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are respectively converted into digital signals by the digital quantity calibration module; the digital signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are compared, and the angle difference and ratio difference of the high voltage and high current signals are respectively calculated; the angle difference and ratio difference are transmitted to the control module;

[0009] The control module is used to control the digital calibration module and the analog calibration module, and receive data sent by the digital calibration module and the analog calibration module.

[0010] Furthermore, the digital quantity calibration module includes: a protocol conversion submodule, a data comparison submodule, a high-precision power supply and a high-precision AD submodule;

[0011] The protocol conversion submodule is used to adjust the transmission protocol of the digital output of different electronic transformers;

[0012] A data comparison submodule is used to compare the digital signal output by the high-precision power supply with that of the electronic transformer to be calibrated, or to compare the digital signal output by the electronic transformer to be calibrated with that of a standard voltage and current transformer;

[0013] A high-precision power supply, used for outputting voltage / current signals and sending the voltage / current signals to a high-precision AD module;

[0014] High-precision AD submodule is used to convert the analog signal output by the high-precision power supply or the signal output by the standard voltage and current transformer module into a digital signal.

[0015] Furthermore, it also includes:

[0016] When calibrating the digital quantity of the electronic transformer to be calibrated, the small voltage / current signal output by the electronic transformer to be calibrated is zero.

[0017] Furthermore, the analog calibration module includes: a standard voltage and current transformer and a range switching submodule;

[0018] Standard voltage and current transformer, used to collect high voltage and high current output by the boost and current device and convert it into standard secondary voltage and current;

[0019] The range switching submodule is used to switch the range of the analog calibration module output according to the instructions of the control module, and output the secondary voltage and current to the high-precision AD module.

[0020] Furthermore, the voltage and current boosting device outputs a high voltage and high current that matches the rated primary voltage and current of the electronic transformer to be calibrated.

[0021] Furthermore, the control module is connected to the digital calibration module and the analog calibration module through a module connector.

[0022] Furthermore, the control module includes a program control unit, a storage module and a power module;

[0023] Programmable control unit, used to control the digital calibration module and analog calibration module based on FPGA chip;

[0024] A storage submodule, used for storing digital calibration and analog calibration data;

[0025] The power submodule is used to supply power to each module.

[0026] Furthermore, the control module further includes:

[0027] The display submodule is used to display the angular difference and ratio difference of the voltage / current signal.

[0028] Furthermore, the control module adopts a fiber optic interface and applies standardized hot-swap technology.

[0029] Furthermore, when only digital calibration is performed on the transformer to be calibrated, only the digital calibration module and the control module can be installed;

[0030] When performing overall calibration on the transformer to be calibrated, it is necessary to install the analog calibration module, digital calibration module and control module at the same time, and assist with the boost and current device.

[0031] This invention provides a modular calibration device for digital and analog voltage and current signals, capable of calibrating digital and analog voltage / current signals for distribution network electronic transformers. The device also incorporates modular digital and analog calibration modules, allowing for convenient office work and increased portability based on actual calibration needs. The device can be disassembled based on on-site digital or analog calibration requirements, enabling quick and easy calibration. A modular interface ensures the device can be disassembled in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a diagram of the overall architecture of a modular calibration device for digital and analog voltage and current signals provided by an embodiment of the present invention;

[0033] Figure 2 This is the digital quantity calibration module architecture and workflow provided by the embodiment of the present invention;

[0034] Figure 3 This is the analog calibration module architecture and workflow provided by the embodiment of the present invention;

[0035] Figure 4 This is the module connection port provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0037] The overall architecture of a modular calibration device for digital and analog voltage and current signals is as follows: Figure 1 The device includes a digital calibration module, an analog calibration module, and a control module. The modules exchange data via module connectors. The device also assists with voltage and current boosting devices to complete the calibration of electronic transformers.

[0038] A digital calibration module is used to convert the analog voltage / current signal output by the high-precision power supply into a digital signal, compare the digital signal with the digital signal output by the electronic transformer to be calibrated, and calculate the angular difference and ratio difference of the voltage / current signal output by the high-precision power supply; and transmit the angular difference and ratio difference to the control module;

[0039] The analog quantity calibration module is connected to the boost and current rising device, and the standard voltage and current transformer receives the high voltage and high current analog signal output by the boost and current rising device and matched with the rated value of the electronic transformer to be calibrated, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the electronic transformer to be calibrated is connected to the boost and current rising device, receives the high voltage and high current analog signal output by the boost and current rising device, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the high voltage and high current analog signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are respectively converted into digital signals by the digital quantity calibration module; the digital signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are compared, and the angle difference and ratio difference of the high voltage and high current signals are respectively calculated; the angle difference and ratio difference are transmitted to the control module;

[0040] The control module is used to control the digital calibration module and the analog calibration module, and receive data sent by the digital calibration module and the analog calibration module.

[0041] When the digital ADMU of the electronic transformer to be calibrated needs to be calibrated, only the digital calibration module and the control module can be installed. The working mode of the digital calibration module architecture is as follows Figure 2 The digital calibration module includes: protocol conversion submodule, data comparison submodule, high-precision power supply and high-precision AD submodule;

[0042] The protocol conversion submodule is used to adjust the transmission protocol of the digital output of different electronic transformers;

[0043] A data comparison submodule is used to compare the digital signal output by the high-precision power supply with that of the electronic transformer to be calibrated, or to compare the digital signal output by the electronic transformer to be calibrated with that of a standard voltage and current transformer;

[0044] A high-precision power supply, used for outputting voltage / current signals and sending the voltage / current signals to a high-precision AD module;

[0045] High-precision AD submodule is used to convert the analog signal output by the high-precision power supply or the signal output by the standard voltage and current transformer module into a digital signal.

[0046] When calibrating the digital output of an electronic instrument transformer (ETT), the low-voltage / current output of the ETT is zero. The high-precision power supply in the digital calibration module outputs signals to the AD conversion submodule. The high-precision power supply outputs a 57.7V low-voltage signal and a 5A or 1A low-current signal. A protocol converter adjusts the transmission protocol for the ADMU output of different EITs. The high-precision AD conversion submodule converts the analog output of the high-precision power supply into a digital value. The data comparison submodule compares the EIT output signal with the calibrator output signal to calculate the angular and ratio differences of the voltage and current. Finally, the data is transmitted to the control module via a connector for display of the angular and ratio differences.

[0047] When the transformer to be calibrated needs to be calibrated as a whole, the analog calibration module, digital calibration module and control module must be installed at the same time, and the boost and current device must be installed as well. Figure 3 shown.

[0048] Analog calibration module, including: standard voltage and current transformer and range switching submodule;

[0049] The standard voltage and current transformer collects the high voltage and current output from the boost and current device and converts it into standard secondary voltage and current. The range switching submodule switches the analog calibration module's output range according to the control module's instructions and outputs the secondary voltage and current to the high-precision AD module. Subsequent calibration procedures can be followed similarly to the digital calibration module.

[0050] The voltage and current boosting device outputs high voltage and high current that matches the rated primary voltage and current of the electronic transformer to be calibrated.

[0051] Control module, including program control unit, storage module and power module;

[0052] The program control unit is used to control the digital calibration module and the analog calibration module based on the FPGA chip; the storage submodule is used to store the data of the digital calibration and analog calibration;

[0053] The power submodule is used to supply power to each module.

[0054] The control module also includes: a display submodule for displaying the angular difference and ratio difference of the voltage / current signal.

[0055] The control module adopts a plug-in design, which consists of a power supply plug-in, clock, storage, backplane, display, etc. It controls the analog calibration module and the digital calibration module and realizes data analysis, display, storage, transmission and other functions. Figure 4 It uses a fiber optic interface and standard hot-swap technology, so module insertion or removal has no effect on device operation.

[0056] This invention provides a modular calibration device for digital and analog voltage and current signals, capable of calibrating digital and analog voltage / current signals for distribution network electronic transformers. The device also incorporates modular digital and analog calibration modules, allowing for convenient office work and increased portability based on actual calibration needs. The device can be disassembled based on on-site digital or analog calibration requirements, enabling quick and easy calibration. A modular interface ensures the device can be disassembled in an orderly manner.

[0057] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0058] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0059] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0060] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0061] 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 it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modifications or equivalents that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A modular calibration device for digital and analog voltage and current signals, characterized in that: include: Digital calibration module, analog calibration module, control module; among them, A digital calibration module is used to convert the analog voltage / current signal output by the high-precision power supply into a digital signal, compare the digital signal with the digital signal output by the electronic transformer to be calibrated, and calculate the angular difference and ratio difference of the voltage / current signal output by the high-precision power supply; and transmit the angular difference and ratio difference to the control module; The analog quantity calibration module is connected to the boost and current rising device, and the standard voltage and current transformer receives the high voltage and high current analog signal output by the boost and current rising device and matched with the rated value of the electronic transformer to be calibrated, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the electronic transformer to be calibrated is connected to the boost and current rising device, receives the high voltage and high current analog signal output by the boost and current rising device, and transmits the high voltage and high current analog signal to the digital quantity calibration module; the high voltage and high current analog signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are respectively converted into digital signals by the digital quantity calibration module; the digital signals output by the standard voltage and current transformer and the electronic transformer to be calibrated are compared, and the angle difference and ratio difference of the high voltage and high current signals are respectively calculated; the angle difference and ratio difference are transmitted to the control module; The control module is used to control the digital calibration module and the analog calibration module, and receive data sent by the digital calibration module and the analog calibration module.

2. The device according to claim 1, characterized in that Digital calibration module, including: protocol conversion submodule, data comparison submodule, high-precision power supply and high-precision AD submodule; The protocol conversion submodule is used to adjust the transmission protocol of the digital output of different electronic transformers; A data comparison submodule is used to compare the digital signal output by the high-precision power supply with that of the electronic transformer to be calibrated, or to compare the digital signal output by the electronic transformer to be calibrated with that of a standard voltage and current transformer; A high-precision power supply, used for outputting voltage / current signals and sending the voltage / current signals to a high-precision AD module; High-precision AD submodule is used to convert the analog signal output by the high-precision power supply or the signal output by the standard voltage and current transformer module into a digital signal.

3. The device according to claim 1, characterized in that Also includes: When calibrating the digital quantity of the electronic transformer to be calibrated, the small voltage / current signal output by the electronic transformer to be calibrated is zero.

4. The device according to claim 1, characterized in that Analog calibration module, including: standard voltage and current transformer and range switching submodule; Standard voltage and current transformer, used to collect high voltage and high current output by the boost and current device and convert it into standard secondary voltage and current; The range switching submodule is used to switch the output range of the analog calibration module according to the instructions of the control module, and output the secondary voltage and current to the high-precision AD module.

5. The device according to claim 1, characterized in that The voltage and current boosting device outputs high voltage and high current that matches the rated primary voltage and current of the electronic transformer to be calibrated.

6. The device according to claim 1, characterized in that The control module is connected to the digital calibration module and the analog calibration module through a module connector.

7. The device according to claim 1, characterized in that Control module, including program control unit, storage module and power module; Programmable control unit, used to control the digital calibration module and analog calibration module based on FPGA chip; A storage submodule, used for storing digital calibration and analog calibration data; The power submodule is used to supply power to each module.

8. The device according to claim 1, characterized in that The control module also includes: The display submodule is used to display the angular difference and ratio difference of the voltage / current signal.

9. The device according to claim 1, characterized in that The control module adopts optical fiber interface and applies standardized hot-swap technology.

10. The device according to claim 1, characterized in that When only digital calibration is performed on the transformer to be calibrated, only the digital calibration module and the control module can be installed; When performing overall calibration on the transformer to be calibrated, it is necessary to install the analog calibration module, digital calibration module and control module at the same time, and assist with the boost and current device.

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