CN115656910B - Remote calibration system, method and equipment for mutual inductor calibration instrument - Google Patents

Abstract

This application relates to a remote calibration system, method and equipment for transformer calibration instruments, and relates to the technical field of transformer calibration instruments in electric energy metering devices, including remote servers and on-site calibration subsystems, remote servers and on-site calibration subsystems Network connection; the on-site calibration subsystem includes an overall inspection and traceability device, a standard device, a camera, and an intelligent terminal. An on-site calibration subsystem is used for supervision and monitoring; the whole inspection and traceability device is used to trace the source of the standard device and realize self-inspection, and transmit the calibration results to the intelligent terminal and remote server; the intelligent terminal is used to transmit traceability, self-inspection and/or Verify the calibration command and receive the detection data information; the camera is used to realize online monitoring. The application has the effect of calibrating the standard device and the instrument to be tested anytime and anywhere, and speeding up the traceability and transfer of the value.

Description

Remote calibration system, method and equipment for instrument transformer calibration

technical field

The present application relates to the technical field of transformer calibration instruments, in particular to a remote calibration system, method and equipment for transformer calibration instruments.

Background technique

Electric energy metering devices include transformers and their secondary circuit equipment, various types of electric energy meters and their acquisition and control terminals. Transformer calibration instruments refer to the calibration equipment of transformers and their secondary circuits, including transformer calibrators, Secondary circuit voltage drop and load tester, transformer load box calibrator, transformer transformation ratio tester, etc. The overall verification device of transformer calibrator is the standard device for verifying and calibrating transformer calibrating instruments. Every kind of transformer calibration instrument and standard equipment needs to be sent for inspection, calibration and traceability every year. The secondary circuit can comply with the grid code.

In the process of transferring relevant values, before the transformer calibration instrument verifies and detects the transformer and its secondary circuit, the national metrology verification regulations stipulate that other standard equipment such as transformer calibration instruments need to be sent to the superior verification agency on a regular basis For verification and calibration, the regulations stipulate that the verification and calibration cycle of the transformer calibration instrument is one year. Before the verification and calibration of the transformer calibration instrument, it is usually necessary to send the standard device of the transformer calibration instrument to the next level or A qualified third-party testing organization performs calibration. The standard device of the transformer calibrator is usually the overall calibration device of the transformer calibrator. After the traceability of the value is completed, the transformer and its secondary circuit are calibrated and tested.

On the one hand, when the transformer calibration instrument and its standard device are sent to the laboratory of the superior verification institution for verification and calibration, bumpy roads and rough loading and unloading are often encountered during transportation, which increases the probability of instrument damage , the value transmission is not timely or even the measurement is inaccurate, and when verifying and calibrating the transformer calibration instrument and its standard device equipment, professional verifiers are required to operate, often waiting in line, which is time-consuming, labor-intensive and inefficient.

On the other hand, when calibrating equipment such as transformer calibration instruments and standard devices, they are all carried out in a laboratory environment. The national metrology verification regulations have relatively high requirements for laboratories, and on-site calibration is not the same environment. The status is not in the same time period, and the additional impact on the error accuracy may lead to inaccurate verification and calibration results and affect the use.

On the other hand, since there is no relevant national or industry communication protocol for the transformer calibrator, only the enterprise standard of the State Grid Corporation of China "Q/GDW1987-2013 Communication Protocol for Transformer Calibrator" is published, and the transformer calibrator of other manufacturers The communication protocol is not public. At present, the technical parameters and test data collection of the instrument to be inspected are mostly manually entered through human eye recognition, or the manufacturer of the instrument to be inspected is required to provide a communication protocol, or the communication protocol of the instrument to be inspected is deciphered. Relevant laws affect the detection efficiency and cannot confirm the authenticity of the detection process data, reducing the traceability and transmission efficiency of the value.

Contents of the invention

In order to calibrate and verify the standard device and the instrument to be tested anytime and anywhere, improve the detection efficiency, accurately calibrate and verify the results, and speed up the traceability and transfer efficiency of the value, the application provides a remote calibration system, method and equipment.

In the first aspect, the present application provides a remote calibration system for a transformer calibration instrument, which adopts the following technical solution:

A remote calibration system for a transformer calibration instrument, comprising a remote server and at least one on-site calibration subsystem, the remote server is connected to the on-site calibration subsystem network; the on-site calibration subsystem includes an overall inspection and traceability device, A standard device, a camera and an intelligent terminal, the whole inspection and traceability device is respectively connected to the intelligent terminal and the standard device, the camera is electrically connected to the intelligent terminal, and the standard device is electrically connected to an instrument to be inspected that needs to be verified or calibrated;

The remote server is used for online real-time supervision and monitoring of the at least one on-site calibration subsystem;

The whole inspection and traceability device is used to realize self-inspection and traceability to the standard device;

The standard device is used to verify or calibrate the instrument to be inspected, obtain the verification and calibration results, and transmit the verification and calibration results to the smart terminal, so that the smart terminal can synchronize the verification or calibration results transmitted to the remote server;

The smart terminal is used to transmit verification and calibration commands and/or self-inspection and traceability commands, and receive the detection results transmitted by the overall inspection and traceability device, standard device, camera and the instrument to be inspected;

The camera is used for on-line monitoring of the technical parameters and display numbers of the instrument to be inspected, to obtain a video image, and to perform image AI autonomous recognition on the video image to obtain a recognition result, and to record the recognition result transmitting to the smart terminal, so that the smart terminal transmits the recognition result to the remote server.

By adopting the above technical scheme, when performing remote verification or calibration of the instrument to be inspected, the intelligent terminal first transmits a calibration command, a traceability command or a self-inspection command to the whole inspection and traceability device, and the whole inspection and traceability device performs according to the received calibration order or self-test command. Self-inspection or calibration, firstly, the whole inspection and traceability device realizes self-inspection according to the received self-inspection command, and then executes the standard device traceability order after the self-inspection is qualified, and then performs verification or calibration according to the calibration order for the instrument to be inspected after the traceability meets the standard. During the process of instrument verification or calibration and self-inspection or traceability of the whole inspection and traceability device, the intelligent terminal transmits the self-inspection and traceability results or verification results to the remote server, so that the remote server can supervise and monitor the whole process of the on-site calibration subsystem, By placing the standard device and the whole inspection and traceability device in the on-site calibration subsystem, the standard device and the instruments to be inspected at any time can be verified or calibrated anytime, anywhere, improving the detection efficiency, accurate calibration results, and speeding up the traceability and transmission of the value efficiency.

Optionally, the whole inspection and traceability device includes an AC signal conditioning module, a standard device amplitude processing module, a satellite timing module, a standard battery and a control module;

The control end of the standard device is electrically connected to the smart terminal, the output end of the standard device is electrically connected to the input end of the AC signal conditioning module, and the output end of the AC signal conditioning module is electrically connected to the standard device amplitude The first input end of the value processing module is electrically connected, the output end of the standard device amplitude processing module is electrically connected to the input end of the control module, the output end of the control module is electrically connected to the intelligent terminal, and the The output end of the satellite timing module is electrically connected to the second input end of the standard device amplitude processing module, and the output end of the standard battery is electrically connected to the third input end of the standard device amplitude processing module;

The standard device is used to respond to the traceability command transmitted by the intelligent terminal, disconnect the connection with the instrument to be inspected and connect with the whole inspection traceability device, generate and transmit the AC signal to the AC signal conditioning module;

The AC signal conditioning module is used to receive the AC signal, amplify or reduce the AC signal to obtain an amplified or reduced AC signal, and convert the amplified or reduced AC signal transmitted to the amplitude processing module of the standard device;

The standard device amplitude processing module is used to perform self-test before obtaining the amplified or reduced alternating current signal, and obtain the satellite time-frequency signal under the reference clock provided by the satellite timing module and the time-frequency signal provided by the standard battery. standard voltage signal, and transmit the satellite time-frequency signal and the first frequency signal converted from the standard voltage signal to the control module, wherein the first frequency signal includes a standard voltage frequency signal converted from the standard voltage signal ;

The control module is used to judge whether the amplitude processing module of the standard device is self-inspected or not according to the satellite time-frequency signal and the first frequency signal, obtain a first judgment result, and transmit the first judgment result to The smart terminal, so that the smart terminal synchronously transmits the first judgment result to the remote server;

After the standard device amplitude processing module passes the self-test, the standard device amplitude processing module is also used to switch to the standard device traceability circuit, receive the amplified or reduced AC signal, and convert the amplified or The reduced alternating current signal is subjected to frequency conversion and after obtaining the satellite time-frequency signal under the reference clock with the satellite timing module and passing through the AND gate of the standard device amplitude processing module, a second frequency signal is obtained, and the obtained The second frequency signal and the satellite time-frequency signal are input into the control module;

The control module is also used to judge whether the amplitude of the standard device meets the standard according to the received second frequency signal and the satellite time-frequency signal, obtain a second judgment result, and transmit the second judgment result to the smart terminal, so that the smart terminal synchronously transmits the second judgment result to the remote server.

Optionally, the standard device amplitude processing module includes an RMS-DC true effective value converter U2, a V/F voltage-frequency converter U3, an AND gate U4 and a relay J4;

The input end of the RMS-DC true effective value converter U2 is electrically connected to the AC signal conditioning module, the output end of the RMS-DC true effective value converter U2 is electrically connected to the first auxiliary contact of the relay J4, and the The second auxiliary contact of the relay J4 is electrically connected to the standard battery, and the third auxiliary contact of the relay J4 is respectively connected to the digital signal input terminal of the control module and the input of the V/F voltage-frequency converter U3 The terminals are electrically connected, the output terminal of the V/F voltage-frequency converter U3 and the output terminal of the satellite timing module are connected to the input terminal of the AND gate U4, and the output terminal of the AND gate U4 is connected to the The pulse signal input terminal of the control module;

The RMS-DC true effective value converter U2 is used to convert the amplified or reduced AC signal into a digital signal, and input the digital signal to the V/F voltage-to-frequency converter U3;

The relay J4 is used to control the conduction of the RMS-DC true effective value converter U2 and the V/F voltage-frequency converter U3 when calibrating the standard device, or control the connection between the standard battery and the The V/F voltage-to-frequency converter U3 is turned on;

The V/F voltage-to-frequency converter U3 is used to convert the digital signal or the standard voltage signal of the standard battery into a pulse signal, and transmit it to the AND gate U4;

The AND gate U4 is used for ANDing the pulse signal and the time-frequency signal to obtain the first frequency signal of the amplified or reduced AC signal under the reference clock, and the first frequency signal and the satellite time-frequency signal is transmitted to the control module;

The control module is used for judging whether the V/F voltage-to-frequency converter U3 is self-tested or not according to the first frequency signal of the standard battery.

Optionally, the AC signal includes an operating current signal, an operating voltage signal, a differential current signal, and a differential voltage signal, and the AC signal conditioning module includes a program-controlled amplifier U1, a program-controlled amplifier U5, and a relay J3; the program-controlled amplifier The input end of U1 is connected to the operating current or operating voltage output end of the standard device, the output end of the program-controlled amplifier U1 is connected to the first auxiliary contact of the relay J3, and the input end of the program-controlled amplifier U5 is connected to The output terminal of the differential current signal or differential voltage signal of the standard device, the output terminal of the program-controlled amplifier U5 is connected to the second auxiliary contact of the relay J3, and the third auxiliary contact of the relay J3 is connected to at the input end of the amplitude processing module of the standard device;

The program-controlled amplifier U1 is used to amplify or reduce the working current signal or working voltage signal output by the standard device to a design threshold;

The program-controlled amplifier U5 is used to amplify or reduce the differential operating current signal or the differential voltage signal output by the standard device to a design threshold.

Optionally, the whole inspection and traceability device further includes a standard device phase processing module, the input end of the standard device phase processing module is connected to the output end of the AC signal conditioning module, and the output end of the standard device phase processing module connected to the input end of the control module;

The phase processing module of the standard device is used to measure the phase of the working and differential AC vector signals, and transmit the phase value to the operation processing in the control module, and the control module transmits the phase measurement result to the intelligent terminal, so that the intelligent The terminal synchronously transmits the phase measurement result to the remote server;

The control module is used to receive the phase value, judge whether the output phase value of the standard device meets the standard according to the phase value, obtain a third judgment result, and synchronously transmit the third judgment result to the intelligent terminal.

Optionally, the standard device phase processing module includes a first zero-crossing detection sub-module Φ6, a second zero-crossing detection sub-module Φ4, a first frequency divider Φ5, a second frequency divider Φ3, a NAND gate Φ1, a lock Phase loop Φ8, third frequency divider Φ7 and AND gate Φ2;

The input terminal of the first zero-crossing detection sub-module Φ6 is connected to the output terminal of the program-controlled amplifier U1, and the output terminals of the first zero-crossing detection sub-module Φ6 are respectively connected to the input of the first frequency divider Φ5 end and the input end of the phase-locked loop Φ8, the output end of the first frequency divider Φ5 is connected to the first input end of the NAND gate Φ1, the output end of the phase-locked loop Φ8 is connected to the The first input end of the AND gate Φ2, the input end of the third frequency divider Φ7 is connected to the output end of the phase-locked loop Φ8, and the output end of the third frequency divider Φ7 is connected to the phase-locked loop The input terminal of Φ8;

The input end of the second zero-crossing detection sub-module Φ4 is connected to the output end of the program-controlled amplifier U5, and the output end of the second zero-crossing detection sub-module Φ4 is connected to the input end of the second frequency divider Φ3 , the output end of the second frequency divider Φ3 is connected to the second input end of the NAND gate Φ1, the output end of the NAND gate Φ1 is connected to the second input end of the AND gate Φ2, the The output end of the AND gate Φ2 is connected to the input end of the control module.

In the second aspect, the present application provides a remote calibration method for a transformer calibration instrument, which adopts the following technical solution:

A remote calibration method for a transformer calibration instrument applied to the remote calibration system for a transformer calibration instrument according to any one of the first aspect, the method comprising:

The standard device responds to the start tracing command issued by the smart terminal, disconnects the connection with the instrument to be inspected and connects with the whole inspection traceability device, generates and transmits an AC signal to the AC signal conditioning module;

The AC signal conditioning module receives the AC signal, and amplifies or reduces the AC signal to obtain an amplified or reduced AC signal, and transmits the amplified or reduced AC signal to The standard device amplitude processing module and the standard device phase processing module;

The standard device amplitude processing module performs a self-test before obtaining the amplified or reduced AC signal, and obtains the satellite time-frequency signal under the reference clock provided by the satellite timing module and the standard voltage provided by the standard battery signal, and transmit the first frequency signal converted from the satellite time-frequency signal and the standard voltage signal to the control module, wherein the first frequency signal includes a standard voltage frequency signal converted from a standard voltage signal;

The control module judges whether the standard device amplitude processing module is self-inspected or not according to the satellite time-frequency signal and the first frequency signal, obtains a first judgment result, and transmits the first judgment result to the an intelligent terminal, so that the intelligent terminal synchronously transmits the first judgment result to the remote server;

When the first judgment result is that the standard device amplitude processing module passes the self-test, the standard device amplitude processing module switches to the standard device traceability circuit, receives the amplified or reduced AC signal, and The amplified or reduced AC signal is subjected to frequency conversion and after the satellite time-frequency signal obtained by the satellite timing module and the reference clock is passed through the AND gate of the standard device amplitude processing module, a second frequency signal is obtained , inputting the second frequency signal and the satellite time-frequency signal into the control module;

The control module judges whether the amplitude of the standard device meets the standard according to the received second frequency signal and the satellite time-frequency signal, obtains a second judgment result, and transmits the second judgment result to the an intelligent terminal, so that the intelligent terminal synchronously transmits the second judgment result to the remote server;

The standard device phase processing module measures the phase value of the AC signal, and inputs the phase value into the control module;

The control module receives the phase value, and judges whether the output phase value of the standard device conforms to the standard according to the phase value, obtains a third judgment result, and transmits the third judgment result to the smart terminal for causing the smart terminal to synchronously transmit the third judgment result to the remote server;

The intelligent terminal determines whether the amplitude and phase of the standard device meet the standard according to the received second judgment result and third judgment result;

When the amplitude and phase of the standard device meet the standards, the intelligent terminal controls the electrical connection between the standard device and the instrument to be tested, and at the same time disconnects the connection with the whole inspection traceability device, and uses the standard device to The instrument to be inspected is verified or calibrated.

Optionally, after using the standard device to verify or calibrate the instrument to be tested, the method further includes:

Obtain the captured video image of the instrument to be inspected;

Perform feature extraction based on deep learning on the captured video based on a preset feature model to obtain accurate display information of the instrument to be inspected;

Generate a verification certificate or a calibration report and a result notification of the instrument to be tested based on the indication information and the electrical signal data output by the standard device;

An instrument file for the instrument to be inspected is generated based on the verification certificate or calibration report and the result notification, and stored.

In a third aspect, the present application provides an intelligent terminal, which adopts the following technical solution:

An intelligent terminal, including a processor, the processor is coupled with a memory;

The memory stores a computer program that can be loaded by a processor and execute the remote calibration method for a transformer calibration instrument according to any one of the second aspect.

Description of drawings

Fig. 1 is a structural block diagram of a remote calibration system for a transformer calibrating instrument according to an embodiment of the present application.

Fig. 2 is a schematic circuit diagram of the whole inspection and traceability device of the embodiment of the present application.

Fig. 3 is a schematic flowchart of a remote calibration method for a transformer calibration instrument according to an embodiment of the present application.

Fig. 4 is a structural block diagram of a smart device provided by an embodiment of the present application.

Explanation of reference signs: 1. Remote server; 2. On-site calibration subsystem; 21. Overall inspection and traceability device; 22. Standard device; 211. AC signal conditioning module; 212. Amplitude processing module of standard device; 213. Satellite timing Module; 214, standard battery; 215, control module; 216, standard device phase processing module; 23, instrument to be inspected; 24, camera; 300, intelligent terminal.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings 1-4 and the embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

The embodiment of the present application discloses a remote calibration system for a transformer calibration instrument. Referring to Figure 1, the remote calibration system for instrument transformer calibration includes a remote server 1 and at least one on-site calibration subsystem 2, the remote server 1 is connected to the network of all on-site calibration subsystems 2; the on-site calibration subsystem 2 includes a complete inspection and traceability device 21. The standard device 22, the camera 24 and the smart terminal 300, the whole inspection and traceability device 21 are respectively connected to the smart terminal 300 and the standard device 22, the camera 24 is electrically connected to the smart terminal 300, and the standard device 22 is electrically connected to the instrument to be calibrated twenty three;

The remote server 1 is used for online real-time supervision and monitoring of at least one on-site calibration subsystem 2;

The overall inspection and traceability device 21 is used to realize self-inspection and traceability to the standard device 22, and transmit the self-inspection and/or traceability results to the smart terminal 300, and transmit them synchronously to the remote server 1 through the smart terminal 300;

The standard device 22 is used to verify and calibrate the instrument 23 to be tested, obtain the verification and calibration results, and transmit the verification and calibration results to the smart terminal 300, and transmit them to the remote server 1 synchronously through the smart terminal 300;

The smart terminal 300 is used to transmit verification and calibration commands and/or self-inspection and traceability commands, and receive inspection data information transmitted by the inspection and traceability device 21 , the standard device 22 , the camera 24 and the instrument to be inspected 23 .

Among them, the detection data information includes verification and calibration results and self-inspection traceability results; the instrument to be inspected can be a transformer calibrator, a secondary voltage drop load tester, a transformer load box calibrator, and a transformer ratio tester.

In this embodiment, one remote server 1 can be connected to several on-site calibration subsystems 2, and at the same time monitor the detection process of multiple on-site calibration subsystems 2 synchronously online and in real time through the Internet. When verifying or calibrating the instrument 23 to be inspected in the on-site calibration subsystem 2, the intelligent terminal 300 first controls the whole inspection and traceability device 21 to realize self-inspection, and then uses the whole inspection and traceability device 21 to check the standard The traceability of the device 22 is performed, and the traceability of the standard device 22 meets the standard before the verification or calibration of the instrument 23 to be inspected can be performed by the whole inspection traceability device 21 .

When using the standard device 22 to verify or calibrate the instrument 23 to be inspected, the standard device 22 is disconnected from the whole inspection traceability device 21 and electrically connected to the instrument 23 to be inspected, and the intelligent terminal 300 transmits a verification or calibration command to the standard device 22, Make the standard device 22 perform verification or calibration on the instrument 23 to be tested to obtain a verification or calibration result, then the standard device 22 transmits the verification or calibration result to the smart terminal 300, and the smart terminal 300 transmits the received verification or calibration result to the remote server 1, The remote server 1 saves the verification or calibration results.

In this embodiment, the verification or calibration result includes a verification certificate and a calibration report, and a result notification is issued for the unqualified instrument to be tested.

As an optional implementation of this embodiment, the whole inspection and traceability device 21 includes an AC signal conditioning module 211, a standard device amplitude processing module 212, a satellite timing module 213, a standard battery 214 and a control module 215;

The control terminal of the standard device 22 is electrically connected to the intelligent terminal 300, the output terminal of the standard device 22 is electrically connected to the input terminal of the AC signal conditioning module 211, and the output terminal of the AC signal conditioning module 211 is connected to the first terminal of the standard device amplitude processing module 212. The input end is electrically connected, the output end of the standard device amplitude processing module 212 is electrically connected to the input end of the control module 215, the output end of the control module 215 is electrically connected to the intelligent terminal 300, the output end of the satellite timing module 213 is connected to the standard device amplitude The second input end of the processing module 212 is electrically connected, and the output end of the standard battery 214 is electrically connected to the third input end of the standard device amplitude processing module 212;

The standard device 22 is used to respond to the self-inspection instruction transmitted by the intelligent terminal 300, disconnect the connection with the instrument 23 to be inspected and connect with the whole inspection traceability device 21, generate and transmit the AC signal to the AC signal conditioning module;

The AC signal conditioning module 211 is used to receive the AC signal, amplify or reduce the AC signal, obtain the amplified or reduced AC signal, and transmit the amplified or reduced AC signal to the standard device for amplitude processing module 212;

The standard device amplitude processing module 212 is used to perform self-test before obtaining the amplified or reduced AC signal, obtain the satellite time-frequency signal under the reference clock provided by the satellite timing module 213 and the standard voltage signal provided by the standard battery 214, and The satellite time-frequency signal under the reference clock and the first frequency signal converted from the standard voltage signal are transmitted to the control module 215, and the first frequency signal includes a standard voltage frequency signal converted from the standard voltage signal;

The control module 215 is used to judge whether the standard device amplitude processing module 212 is self-inspected or not according to the satellite time-frequency signal and the first frequency signal under the reference clock, obtain the first judgment result, and transmit the first judgment result to the smart terminal 300, And synchronously transmit to the remote server 1 through the intelligent terminal 300;

After the standard device amplitude processing module 212 passes the self-test, the standard device amplitude processing module 212 is also used to switch to the traceability circuit of the standard device 22, receive the amplified or reduced AC signal, and convert the amplified or reduced AC signal The signal is subjected to frequency conversion and after obtaining the satellite time-frequency signal under the reference clock with the satellite timing module 213 and passing through the AND gate of the standard device amplitude processing module 212, the second frequency signal is obtained, and the second frequency signal and the satellite The time-frequency signal is input into the control module 215;

The control module 215 is also used to judge whether the standard device 22 conforms to the standard according to the received second frequency signal and the satellite time-frequency signal, obtain the second judgment result, and transmit the second judgment result to the smart terminal 300, and synchronize it through the smart terminal 300 Send to remote server 1.

In this embodiment, before the verification or calibration of the instrument 23 to be inspected, the source of the standard device 22 needs to be traced to ensure the accuracy of the verification or calibration of the instrument 23 to be inspected.

Among them, when the standard device 22 traces the source, first respond to the traceability command, disconnect the connection with the instrument 23 to be inspected and connect the whole inspection traceability device 21, start the standard device 22 traceability program, and the standard device 22 transmits the AC signal to the AC signal conditioning In the module 211, after the AC signal is amplified or reduced by the AC signal conditioning module 211, the amplified or reduced AC signal is transmitted to the standard device amplitude processing module 212, wherein the AC signal includes an operating voltage signal, Working current signal, differential current signal and differential voltage signal.

Before the source of the standard device 22 is traced according to the amplified or reduced AC signal, the standard voltage signal of the standard battery 214 is used to convert the frequency signal under the reference clock and the satellite time-frequency signal pair under the reference clock of the satellite timing module 213 The standard device amplitude processing module 212 carries out self-inspection, judges whether the standard device amplitude processing module 212 is qualified, obtains the first judgment result, after the standard device amplitude processing module 212 is qualified, then utilizes the standard device amplitude processing module 212 to standard The device 22 traces the source, that is, the amplified or reduced AC signal is converted into a DC voltage signal, and then the DC voltage signal and the satellite time-frequency signal are processed by the standard device amplitude processing module 212 and the satellite timing module 213, and then transmitted to the control In the module 215, the control module 215 judges whether the standard device 22 conforms to the standard according to the received processed DC voltage signal and the satellite time-frequency signal, and obtains the second judgment result, and then the control module 215 combines the first judgment result and the second judgment result Synchronously transmitted to the smart terminal 300, and synchronously transmitted to the remote server 1 through the smart terminal 300 for archiving.

In this embodiment, the first judgment result includes that the standard device amplitude processing module 212 meets the standard and the standard device amplitude processing module 212 does not meet the standard; the second judgment result includes that the standard device 22 meets the standard and the standard device 22 does not meet the standard.

In this embodiment, the optional model of the standard device 22 is the overall verification device of the digital voltage transformer calibrator authorized by the utility model patent ZL201620305227.1, and the optional model of the satellite timing module 213 is the GPS satellite timing module, Beidou Any one or a combination of satellite timing modules, GLONASS satellite timing modules and Galileo satellite timing modules; the optional model of the control module 215 is an MCU microprocessor of STM32F103C8T6.

As an optional implementation of this embodiment, the standard device amplitude processing module 212 includes an RMS-DC true effective value converter U2, a V/F voltage-frequency converter U3, an AND gate U4, and a relay J4;

The input end of the RMS-DC true effective value converter U2 is electrically connected with the AC signal conditioning circuit, the output end of the RMS-DC true effective value converter U2 is electrically connected with the first auxiliary contact of the relay J4, and the second auxiliary contact of the relay J4 The contact is electrically connected to the standard battery 214, and the third auxiliary contact of the relay J4 is respectively electrically connected to the digital signal input end of the control module 215 and the input end of the V/F voltage-frequency converter U3, and the V/F voltage-frequency converter U3 The output end of and the output end of the satellite timing module 213 are all connected to the input end of the AND gate U4, and the output end of the AND gate U4 is connected to the pulse signal input end of the control module 215;

The RMS-DC true effective value converter U2 is used to convert the amplified or reduced AC signal into a digital signal, and input the digital signal to the V/F voltage-frequency converter U3;

The relay J4 is used to control the conduction of the RMS-DC true effective value converter U2 and the V/F voltage-frequency converter U3 when the standard device 22 is calibrated, or to control the standard battery 214 and the V/F voltage when performing self-test The frequency converter U3 is turned on;

The V/F voltage-frequency converter U3 is used to convert the digital signal into a pulse signal and transmit it to the AND gate U4;

The AND gate U4 is used to AND the pulse signal and the satellite time-frequency signal to obtain the second frequency signal of the amplified AC signal under the reference clock, and transmit the second frequency signal under the reference clock and the satellite time-frequency signal to the control within module 215.

When performing a self-test on the standard device amplitude processing module 212, first the control module 215 controls the relay J4 to conduct the standard battery 214 and the V/F voltage-frequency converter U3, and the standard battery 214 outputs 1V standard voltage to the V/F voltage frequency Converter U3, V/F voltage-frequency converter U3 converts the 1V standard voltage signal into a pulse signal, then transmits the pulse signal to the AND gate U4, and then synchronizes the satellite time-frequency signal under the reference clock received by the satellite timing module 213 Transmit in the AND gate U4, after the AND gate U4 phases the pulse signal and the satellite time-frequency signal, the first frequency signal of the standard battery 214 under the reference clock is obtained, and then the first frequency signal of the standard battery 214 under the reference clock is The signal is transmitted to the control module 215, and the control module 215 judges whether the V/F voltage-frequency converter U3 is qualified.

For example, if the reference clock of the satellite is selected as 1 second, then the second conversion frequency is 10kHz. Now, the standard battery 214 selects 0.01 grade 1V second-class standard battery 214 for use, and the voltage output by the standard battery 214 is 1V. When the 1V standard voltage passes through V When the frequency of converting 1V standard voltage into a pulse signal by the /F voltage-to-frequency converter U3 is 10kHz, the V/F voltage-to-frequency converter U3 meets the standard, and the standard device 22 can be calibrated by the V/F voltage-to-frequency converter U3. When the first conversion frequency exceeds the preset range, wherein the preset range is 9.998kHz-10.002kHz, then there is an error in the V/F voltage-to-frequency converter U3 at this time, and the V/F voltage-to-frequency converter U3 needs to be repaired or replaced , the standard device 22 can only be traced to the source after passing the self-test again.

As an optional implementation of this embodiment, the AC signal conditioning module 211 includes a program-controlled amplifier U1 for amplifying or reducing the working current or working voltage signal, and the primary current 1A and 5A for conditioning the working current signal. Converted to a current transformer CT with a fixed secondary current of 20mA and a resistor R0 for converting voltage signals, resistors R1, R2 and R6 for working voltage division, and a program-controlled amplifier for amplifying differential current or differential pressure signals U5, differential current divider resistor R3 and resistor R7, differential voltage resistor R4, resistor R5 and resistor R8, relay J1 for switching the working current and working voltage signal, used for switching differential current and differential Voltage signal relay J2, relay J5 for switching voltage levels such as working voltage 100V/√3 and 100V, relay J6 for switching differential current signals of working current levels such as 1A and 5A, and switching working voltage 100V/√ 3 and 100V voltage level differential pressure signal relay J7, wherein the resistors in this embodiment are all precision resistors.

The primary side of the current transformer CT is connected to the first working current output terminal of the standard device 22, and the two ends of the secondary side of the current transformer CT are connected in parallel with a resistor R0, wherein one end of the secondary side is grounded, and the other end is connected to the relay J1 The first auxiliary contact; the first auxiliary contact of the relay J5 is connected to the first working voltage signal output end of the standard device 22, the second auxiliary contact of the relay J5 is connected to one end of the resistor R1, and the other end of the resistor R1 Connect to one end of the resistor R2, the other end of the resistor R2 is respectively connected to the second working voltage signal output end of the standard device 22 and the ground, and the connection point of the resistor R1 and the resistor R2 is connected to the second auxiliary contact of the relay J1 point; the third auxiliary contact of relay J5 is connected to one end of resistor R6, the other end of resistor R6 is connected to the second auxiliary contact of relay J1, and the third auxiliary contact of relay J1 is connected to the input of program-controlled amplifier U1 terminal, wherein the resistors in this embodiment are all precision resistors.

In this embodiment, the circuit connection mode of the amplification processing of the differential voltage and the differential current is similar to the connection mode of the working current and the working voltage, and will not be repeated here.

When tracing the source of the standard device 22, the standard device 22 outputs different types of AC signals, and then sets the verification point according to the regulations of "JJG169 Transformer Calibration Instrument" and then transmits the amplified or reduced AC signal to the standard device The amplitude processing module 212 is used to calibrate and trace the standard device 22.

For example, according to the verification regulations of current transformers, when the working current signal to be detected is 5A or 1A, the calibration points are 1%, 5%, 20%, 100%, 120%, and the current of 1A-or-5A/20mA Transformer CT conditioning current signal is 0.0002A, 0.001A, 0.004A, 0.02A, 0.024A, the conversion voltage signal is 0.01V, 0.05V, 0.2V, 1V, 1.2V, the magnification of the signal to be detected is ×100 , ×20, ×5, ×1, ×1. In addition to 5A or 1A, the working current signal also has other working current signals such as 0.5A;

According to the verification regulations of voltage transformers, when the working voltage signal to be detected is 100V/√3 or 100V, the calibration points are 20%, 50%, 80%, 100%, 120%, and the conditioning voltage signals are 0.2V, 0.5V , 0.8V, 1V, 1.2V, the amplification factor of the signal to be detected corresponds to ×5, ×2, ×1.25, ×1, ×1. In addition to 100V/√3 or 100V, there are other working voltage signals such as 150V and 220V;

According to the current transformer verification regulations, the differential current signal to be detected generally does not exceed 10% of the rated operating current of 1A or 5A, the maximum differential current signal is set to 0.1A or 0.5A, and the calibration points are 1%, 5%, 20%, and 100%. , 120%, the conditioning voltage signal is 0.01V, 0.05V, 0.2V, 1V, 1.2V, the magnification of the signal to be detected is ×1000, ×200, ×50, ×10, ×10 respectively;

According to the verification regulations of voltage transformers, the differential pressure signal to be detected generally does not exceed 10% of the current 100V/√3 or 100V, that is, 5.7737V or 10V, and the calibration points are 20%, 50%, 80%, 100%, and 120%. The voltage signals are 0.2V, 0.5V, 0.8V, 1V, 1.2V, and the amplification factors of the signals to be detected are ×50, ×20, ×12.5, ×10, ×10 respectively.

In order to make the AC vector signal of the standard device 22 true and accurate, the inspection and traceability device 21 also includes a standard device phase processing module 216, and the input terminals of the standard device phase processing module 216 are respectively connected to the output terminal A and the output terminal B of the AC signal conditioning module 211 , the output end of the standard device phase processing module 216 is connected to the input end of the control module 215;

The standard device phase processing module 216 is used to measure the phase value of the working and difference AC vector signal, and transmit the phase value to the control module 215;

The control module 215 is used to receive the phase value, and judge whether the output phase value of the standard device 22 meets the standard according to the phase value, obtain the third judgment result, and transmit the third judgment result to the smart terminal 300, and transmit it synchronously to remote server 1;

After the AC signal conditioning module 211 processes the AC signal output by the standard device 22, it needs to judge the phase of the amplified or reduced AC signal, and further judge the accuracy of the standard device 22 by means of AC vector signal processing.

As an optional implementation of this embodiment, the standard device phase processing module 216 includes a first zero-crossing detection sub-module Φ6, a second zero-crossing detection sub-module Φ4, a first frequency divider Φ5, and a second frequency divider Φ3 , NAND gate Φ1, phase-locked loop Φ8, third frequency divider Φ7 and AND gate Φ2;

The input end of the first zero-crossing detection sub-module Φ6 is connected to the output end of the program-controlled amplifier U1, and the output end of the first zero-crossing detection sub-module Φ6 is respectively connected to the input end of the first frequency divider Φ5 and the input of the phase-locked loop Φ8 The output terminal of the first frequency divider Φ5 is connected to the first input terminal of the NAND gate Φ1, the output terminal of the phase-locked loop Φ8 is connected to the first input terminal of the AND gate Φ2, and the input terminal of the third frequency divider Φ7 Connected to the output end of the phase-locked loop Φ8, the output end of the third frequency divider Φ7 is connected to the input end of the phase-locked loop Φ8;

The input end of the second zero-crossing detection sub-module Φ4 is connected to the output end of the program-controlled amplifier U5, the output end of the second zero-crossing detection sub-module Φ4 is connected to the input end of the second frequency divider Φ3, and the output end of the second frequency divider Φ3 The output end is connected to the second input end of the NAND gate Φ1 , the output end of the NAND gate Φ1 is connected to the second input end of the AND gate Φ2 , and the output end of the AND gate Φ2 is connected to the input end of the control module 215 .

In this embodiment, during the process of calibrating the standard device 22, the standard device 22 transmits the AC signal to the standard device phase processing module 216 through the AC signal conditioning module 211, and the AC signal conditioning module 211 controls the AC operating voltage, The AC operating current, differential operating voltage or differential operating current is amplified or reduced to a design threshold of 1V (calibration point 100%), and simultaneously transmitted to the first zero-crossing detection sub-module Φ6 and the second zero-crossing detection sub-module Φ4 Inside, the AC operating voltage or differential operating voltage is transmitted to the first zero-crossing detection sub-module Φ6, the AC operating current or differential operating current is transmitted to the second zero-crossing detection sub-module Φ4, and passes through the first zero-crossing detection sub-module Φ6 and The second zero-crossing detection sub-module Φ4 converts the 50Hz AC signal into a 50Hz positive pulse signal, and then uses the first frequency divider Φ5 and the second frequency divider Φ3 to convert the positive pulse signal of the AC working signal and the differential working signal into 50Hz is converted to 0.5Hz, and the phase difference is obtained through the NAND gate Φ1; the zero-crossing pulse signal of the AC operating voltage or AC operating current is simultaneously input to the phase-locked loop Φ8 and the third frequency divider Φ7 to multiply the frequency of the 50Hz power frequency signal 1080000Hz, the phase value of the NAND gate Φ1 and 1080000Hz are simultaneously generated by the AND gate Φ2 and transmitted to the counter of the control module 215 for counting, and the phase measurement is completed to obtain the phase measurement data.

Use 1080000Hz pulses to count 50Hz, that is, every 1 pulse is equal to 1′, and the phase is also enlarged by 100 times due to the frequency division of 50Hz by 100 times, that is, the value corresponding to each pulse is 0.01′, and the value corresponding to 50000 pulses is 500', the control module 215 judges whether the phase of the standard device 22 meets the standard according to the range of the received phase measurement data, and obtains a third judgment result, which includes whether the standard device 22 meets the standard or the standard device 22 does not meet the standard.

Only when the standard device amplitude processing module 212 and the standard device phase processing module 216 determine that the amplitude and phase of the standard device 22 meet the standard, the standard device 22 meets the standard.

When the standard device amplitude processing module 212 and the standard device 22 complete self-inspection and traceability successively and the phase measurement of the standard device phase processing module 216 is accurate, the standard device 22 can verify or calibrate the instrument 23 to be tested.

After the self-inspection and traceability of the whole inspection and traceability device 21 are completed, the smart terminal 300 starts the verification or calibration procedure of the standard device 22. At this time, the control standard device 22 is disconnected from the whole inspection and traceability device 21 and switched to the instrument 23 to be tested. , start to test or calibrate the instrument 23 to be tested.

In this embodiment, since the communication protocol of the equipment to be tested 23 of other manufacturers is not disclosed, and there is no communication protocol formulated by the country and the industry for the transformer calibration instrument, the remote verification and calibration process needs to use the camera 24 for online real-time supervision and monitoring.

The camera 24 is used for on-line monitoring of the technical parameters and display values of the instrument to be inspected 23, obtains the captured video images, and performs image AI autonomous identification on the captured video images to obtain the identification results, and transmits the identification results to the smart terminal 300, and Synchronously transmitted to the remote server 1 through the smart terminal 300.

After obtaining the captured video image, it is recognized and confirmed by software deep learning, and then converted into the indication data of the instrument 23 to be inspected to improve the recognition rate, and transmitted to the smart terminal 300, and then synchronously transmitted to the remote server 1 through the Internet for online real-time supervision Monitor, and then convert into error data according to the indication data, which is convenient for verification or calibration of the instrument to be tested.

In this embodiment, it should be noted that the image AI self-recognition of this application adopts the existing technology, as long as it can realize the functions of automatic light supplement, automatic zoom and self-recognition, so this application will not elaborate too much and specific limits.

After obtaining the indication data of the instrument to be inspected 23, the smart terminal 300 can judge the accuracy of the instrument to be inspected 23 according to the indication value data of the instrument to be inspected 23, so as to issue a verification certificate or a calibration report according to whether the accuracy meets the standard, and if it does not meet the standard A result notification will be issued.

The implementation principle of a remote calibration system for a transformer calibration instrument provided in the embodiment of the present application is as follows: before the instrument 23 to be checked is calibrated, it is necessary to perform a self-inspection on the entire inspection traceability device 21, and perform a self-inspection on the entire inspection traceability device 21 In the process, the relay J4 is firstly controlled to make the standard battery 214 and the V/F voltage-frequency converter U3 conduction, so that the standard voltage output by the standard battery 214 is input to the AND gate U4, and at the same time, the satellite timing module 213 obtains the reference clock. The time-frequency signal is transmitted to the AND gate U4, and after the phase AND of the AND gate U4, the first frequency signal under the reference clock converted by the V/F voltage-to-frequency converter U3 is obtained, and the first conversion frequency is input into the control module 215 to control Module 215 judges whether the V/F voltage-to-frequency converter U3 is qualified according to the first frequency signal and the satellite time-frequency signal under the received reference clock. When within the accuracy range of the V/F voltage-frequency converter U3, the control module 215 judges that the V/F voltage-frequency converter U3 is qualified; when the error of the first frequency signal relative to the satellite time-frequency signal is not within the accuracy range of the V/F voltage-frequency converter U3, the control module 215 Module 215 determines that the V/F voltage-frequency converter U3 is unqualified, and generates an alarm signal for operation and maintenance and replacement.

After judging that the V/F voltage-frequency converter U3 is qualified, the control standard device 22 is disconnected from the instrument 23 to be tested, and the standard device 22 is calibrated. When the standard device 22 is calibrated, the standard device 22 outputs an AC signal to the AC signal conditioning module 211, and then the AC signal is amplified or reduced by the corresponding program-controlled amplifier U1 and program-controlled amplifier U5, and then the amplified or reduced AC signal is transmitted to the standard device amplitude processing module 212 and the standard device respectively The phase processing module 216 makes the standard device amplitude processing module 212 judge the amplitude of the AC signal to obtain a second judgment result, and the standard device phase processing module 216 judges the phase difference of the AC signal to obtain a third judgment result, The control module 215 transmits the second judgment result and the third judgment result to the smart terminal 300 and transmits them synchronously to the remote server 1 through the smart terminal 300, and the smart terminal 300 determines whether the standard device 22 meets the criteria according to the second judgment result and the third judgment result. standard.

When both the second judgment result and the third judgment result meet the standard, it can be determined that the standard device 22 meets the standard; when the second judgment result and/or the third judgment result is that the standard device 22 does not meet the standard, the standard device 22 does not meet the standard.

After judging that the standard device 22 conforms to the standard, the control standard device 22 disconnects the connection with the whole inspection and traceability device 21 and switches to the connection with the instrument 23 to be inspected, and verifies or calibrates the instrument 23 to be inspected.

Referring to Fig. 3, the embodiment of the present application also provides a remote calibration method for a transformer calibration instrument, the main flow of the method is described as follows (step S101 to step S110):

Step S101 , the standard device 22 responds to the traceability command issued by the smart terminal 300 , disconnects the device 23 to be inspected and connects with the traceability device 21 , generates and transmits an AC signal to the AC signal conditioning module 211 .

Step S102, the AC signal conditioning module 211 receives the AC signal, and amplifies or reduces the AC signal to obtain the amplified or reduced AC signal, and transmits the amplified or reduced AC signal to the standard device amplitude processing module 212 and standard device phase processing module 216 .

Step S103, the standard device amplitude processing module 212 performs self-inspection before obtaining the amplified or reduced AC signal, and obtains the satellite time-frequency signal under the reference clock provided by the satellite timing module 213 and the standard voltage signal provided by the standard battery 214, And transmit the first frequency signal converted from the satellite time-frequency signal and the standard voltage signal to the control module 215, wherein the first frequency signal includes the standard voltage frequency signal converted from the standard voltage signal.

Step S104, the control module 215 judges whether the standard device amplitude processing module 212 is self-inspection qualified according to the satellite time-frequency signal and the first frequency signal, obtains the first judgment result, and transmits the first judgment result to the smart terminal 300, so that the smart The terminal 300 transmits the first judgment result to the remote server 1 synchronously.

Step S105, when the first judgment result is that the standard device amplitude processing module 212 passes the self-test, the standard device amplitude processing module 212 switches to the traceability circuit of the standard device 22, receives the amplified or reduced AC signal, and amplifies or The reduced alternating current signal is subjected to frequency conversion and after obtaining the satellite time-frequency signal AND gate U4 under the reference clock with the satellite timing module 213, the second frequency signal is obtained, and the second frequency signal and the satellite time-frequency signal are input to the control within module 215.

Step S106, the control module 215 judges whether the amplitude of the standard device 22 meets the standard according to the received second frequency signal and the satellite time-frequency signal, obtains the second judgment result, and transmits the second judgment result to the smart terminal 300, so that the smart The terminal 300 transmits the second judgment result to the remote server 1 synchronously.

Step S107 , the standard device phase processing module 216 is used to measure the phase value of the AC signal, and transmit the phase value to the control module 215 .

Step S108, the control module 215 receives the phase value, and judges whether the output phase value of the standard device 22 meets the standard according to the phase value range, obtains the third judgment result, and transmits the third judgment result to the smart terminal 300, so that the smart terminal 300 will The third judgment result is transmitted to the remote server 1 synchronously.

In step S109, the smart terminal 300 judges whether the amplitude and phase of the standard device 22 meet the standard according to the received second and third judgment results.

Step S110, when the amplitude of the standard device 22 meets the standard, the intelligent terminal 300 controls the standard device 22 to connect to the instrument 23 to be tested, and at the same time disconnects the connection with the whole inspection traceability device 21, and uses the standard device 22 to verify the instrument 23 to be tested or calibration.

In this embodiment, after using the standard device 22 to certify or calibrate the instrument 23 to be inspected, the method further includes: acquiring a captured video image of the instrument to be inspected 23; performing feature extraction based on deep learning on the captured video based on a preset feature model , to obtain accurate display information of the instrument to be inspected 23; generate a test certificate or a calibration report and a result notification of the test instrument 23 based on the display information and the electrical signal data output by the standard device 22; generate a test report based on the test certificate or calibration report The file of the instrument to be inspected for the instrument 23 is saved.

In this embodiment, in order to increase the veracity and validity of the verification or calibration process and the authority of the data conclusion, when the control standard device 22 performs verification or calibration of the instrument 23 to be inspected, the display value of the instrument to be inspected 23 is monitored online by using a photographing device. Shoot, get the shooting video, use the preset feature model to extract the features of the indication value in the shooting video, get the feature information, generate the verification certificate or calibration report and result notification according to the feature information, and generate the test certificate or calibration report according to the verification certificate or calibration report Instrument file; wherein, the file of the instrument to be inspected includes the basic information of the video and the instrument to be inspected 23, the basic information of the instrument to be inspected 23 includes the name, number and unit of the instrument to be inspected 23, and the feature information includes the first conversion frequency and the first conversion frequency. Two conversion frequency.

Input the obtained characteristic information into the template of the verification certificate or calibration report and the result notice, and generate a two-dimensional code related to the instrument 23 to be tested in each verification certificate or calibration report and the template of the result notice, which is convenient for users to pass Scan the QR code for the contents of the calibration report.

After the verification certificate or calibration report and the result notification are obtained, they need to be stored in the smart terminal 300 so as to track and understand the history of the instrument 23 to be checked later.

Further, after generating and saving the file of the instrument to be inspected 23 based on the verification certificate or calibration report and the result notification, the method further includes: establishing a digital twin model based on various real-time data collection information during the verification or calibration process; Generate a calibration process file based on the digital twin model; transmit the calibration process file to the remote server 1 through blockchain technology; establish an information database in the remote server 1; store the calibration process file based on the information database.

In this embodiment, since the calibration process of the instrument 23 to be inspected is stored after the instrument 23 to be inspected is calibrated to reduce the possibility of loss, it is necessary to establish a digital twin model based on the real-time data acquisition information of the verification or calibration process, according to The simulation process of the digital twin model generates verification or calibration process files. In order to ensure that the instrument 23 to be tested is not tampered with and lost during transmission to the remote server 1, the verification or calibration files are transmitted using blockchain transmission technology, which can enhance The stability and security of verification or calibration files during transmission are more convenient.

At the same time, an information database is established on the remote server 1, and the file of each unchecked instrument 23 is stored in the information database, so that the verification or calibration process of the unchecked instrument 23 can be preserved, which is convenient for archiving and querying.

FIG. 4 is a structural block diagram of a smart terminal 300 provided by an embodiment of the present application.

As shown in FIG. 4 , the smart terminal 300 includes a processor 301 and a memory 302 , and may further include an information input/output (I/O) interface 303 , one or more of communication components 304 and a communication bus 305 .

Among them, the processor 301 is used to control the overall operation of the intelligent terminal 300, so as to complete all or part of the steps of the above-mentioned remote calibration method for the transformer calibration instrument; the memory 302 is used to store various types of data to support the smart terminal 300 For example, these data may include instructions for any application or method operating on the smart terminal 300, as well as application-related data. The memory 302 can be realized by any type of volatile or non-volatile storage device or their combination, such as Static Random Access Memory (Static Random Access Memory, SRAM), Electrically Erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), Erasable Programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (Read-Only One or more of Memory, ROM), magnetic memory, flash memory, magnetic disk or optical disk.

The I/O interface 303 provides an interface between the processor 301 and other interface modules, which may be a keyboard, a mouse, buttons, and the like. These buttons can be virtual buttons or physical buttons. The communication component 304 is used for wired or wireless communication between the smart terminal 300 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NearField Communication, NFC for short), 2G, 3G or 4G, or one or a combination of them, so the corresponding communication component 304 may include: Wi -Fi parts, bluetooth parts, NFC parts.

The smart terminal 300 can be implemented by one or more application-specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), digital signal processors (Digital Signal Processor, DSP for short), digital signal processing devices (Digital Signal Processing Device, DSPD for short), Programmable logic device (Programmable Logic Device, be called for short PLD), field programmable gate array (Field ProgrammableGate Array, be called for short FPGA), controller, microcontroller, microprocessor or other electronic components realize, be used to carry out the above-mentioned embodiment given A remote calibration method for transformer calibration instruments.

Communication bus 305 may include a path for transferring information between the components described above. The communication bus 305 may be a PCI (Peripheral Component Interconnect, Peripheral Component Interconnect Standard) bus or an EISA (Extended Industry Standard Architecture, Extended Industry Standard Architecture) bus, etc. The communication bus 305 can be divided into an address bus, a data bus, a control bus, and the like.

The smart terminal 300 may include, but is not limited to, mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc. Mobile terminals and fixed terminals such as digital TVs, desktop computers, etc., may also be servers.

The term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also elements inherent in such a process, method, article, or apparatus.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principle. Those skilled in the art should understand that the application scope involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover the technical solutions made by the above-mentioned technical features or Other technical solutions formed by any combination of equivalent features. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions in this application.

Claims (8)

1. A remote calibration system for instrument transformer calibration, characterized in that it comprises a remote server (1) and at least one on-site calibration subsystem (2), the remote server (1) and the on-site calibration subsystem (2) network connection; the on-site calibration subsystem (2) includes a complete inspection traceability device (21), a standard device (22), a camera (24) and an intelligent terminal (300), and the complete inspection traceability device (21) Respectively connected to the smart terminal (300) and the standard device (22), the camera (24) is electrically connected to the smart terminal (300), and the standard device (22) is electrically connected to an instrument to be checked that requires verification or calibration (twenty three); The remote server (1) is used for online real-time supervision and monitoring of the at least one on-site calibration subsystem (2); The whole inspection traceability device (21) is used to realize self-inspection and traceability to the standard device (22); The standard device (22) is used to test or calibrate the instrument to be tested (23), obtain a test calibration result, and transmit the test calibration result to the smart terminal (300), so that the smart The terminal (300) synchronously transmits the test or calibration result to the remote server (1); The intelligent terminal (300) is used to transmit the verification and calibration order and/or the self-inspection and traceability order, and receives the whole inspection and traceability device (21), the standard device (22), the camera (24) and the instrument to be inspected ( 23) Transmission test results; The camera (24) is used for on-line monitoring of the technical parameters and display values of the instrument to be inspected (23), to obtain a captured video image, and to perform image AI autonomous recognition on the captured video image to obtain a recognition result, and transmitting the identification result to the intelligent terminal (300), so that the intelligent terminal (300) transmits the identification result to the remote server (1); The whole inspection and traceability device (21) includes an AC signal conditioning module (211), a standard device amplitude processing module (212), a satellite timing module (213), a standard battery (214) and a control module (215); The control end of the standard device (22) is electrically connected to the intelligent terminal (300), the output end of the standard device (22) is electrically connected to the input end of the AC signal conditioning module (211), and the AC The output end of the signal conditioning module (211) is electrically connected to the first input end of the standard device amplitude processing module (212), and the output end of the standard device amplitude processing module (212) is connected to the control module (215 ), the output end of the control module (215) is electrically connected to the intelligent terminal (300), and the output end of the satellite timing module (213) is electrically connected to the standard device amplitude processing module (212 ) is electrically connected to the second input end, and the output end of the standard battery (214) is electrically connected to the third input end of the standard device amplitude processing module (212); The standard device (22) is used to respond to the traceability command transmitted by the intelligent terminal (300), disconnect the connection with the instrument (23) to be inspected and connect with the traceability device (21), generate and Transmitting the AC signal to the AC signal conditioning module (211); The AC signal conditioning module (211) is configured to receive the AC signal, and amplify or reduce the AC signal to obtain an amplified or reduced AC signal, and convert the amplified or reduced AC signal to The AC signal is transmitted to the standard device amplitude processing module (212); The standard device amplitude processing module (212) is used to perform self-inspection before obtaining the amplified or reduced AC signal, obtain the satellite time-frequency signal under the reference clock provided by the satellite timing module (213) and The standard voltage signal provided by the standard battery (214), and the first frequency signal converted from the satellite time-frequency signal and the standard voltage signal is transmitted to the control module (215), wherein the first The frequency signal includes a standard voltage frequency signal converted from a standard voltage signal; The control module (215) is used to judge whether the standard device amplitude processing module (212) is self-inspection qualified according to the satellite time-frequency signal and the first frequency signal, obtain a first judgment result, and send the transmitting the first judgment result to the smart terminal (300), so that the smart terminal (300) synchronously transmits the first judgment result to the remote server (1); After the standard device amplitude processing module (212) passes the self-test, the standard device amplitude processing module (212) is also used to switch to the standard device (22) traceability circuit to receive the amplified or reduced AC Electric signal, and the alternating current signal after described amplifying or shrinking carries out frequency conversion, and obtains satellite time-frequency signal under the reference clock with described satellite timing module (213) and passes through described standard device amplitude processing module (212) After the AND gate is phase-ANDed, a second frequency signal is obtained, and the second frequency signal and the satellite time-frequency signal are input into the control module (215); The control module (215) is further configured to judge whether the amplitude of the standard device (22) conforms to the standard according to the received second frequency signal and the satellite time-frequency signal, obtain a second judgment result, and convert the The second judgment result is transmitted to the smart terminal (300), so that the smart terminal (300) synchronously transmits the second judgment result to the remote server (1). 2. the transformer calibration instrument remote calibration system according to claim 1, is characterized in that, described standard device amplitude processing module (212) comprises RMS-DC true effective value converter U2, V/F voltage-frequency conversion Device U3, AND gate U4 and relay J4; The input end of the RMS-DC true effective value converter U2 is electrically connected to the AC signal conditioning module (211), and the output end of the RMS-DC true effective value converter U2 is electrically connected to the first auxiliary contact of the relay J4 , the second auxiliary contact of the relay J4 is electrically connected to the standard battery (214), and the third auxiliary contact of the relay J4 is respectively connected to the digital signal input terminal of the control module (215) and the V The input end of the /F voltage-frequency converter U3 is electrically connected, and the output end of the V/F voltage-frequency converter U3 and the output end of the satellite timing module (213) are all connected to the input end of the AND gate U4, The output terminal of the AND gate U4 is connected to the pulse signal input terminal of the control module (215); The RMS-DC true effective value converter U2 is used to convert the amplified or reduced AC signal into a digital signal, and input the digital signal to the V/F voltage-to-frequency converter U3; The relay J4 is used to control the conduction of the RMS-DC true effective value converter U2 and the V/F voltage-frequency converter U3 when tracing the source of the standard device (22), or to control the conduction of the The standard battery (214) is connected to the V/F voltage-frequency converter U3; The V/F voltage-to-frequency converter U3 is used to convert the digital signal or the standard voltage signal of the standard battery (214) into a pulse signal, and transmit it to the AND gate U4; The AND gate U4 is used for ANDing the pulse signal and the satellite time-frequency signal to obtain the first frequency signal of the amplified or reduced AC signal under the reference clock, and the first frequency The signal and the satellite time-frequency signal are transmitted to the control module (215); The control module (215) is used for judging whether the V/F voltage-to-frequency converter U3 is self-tested or not according to the first frequency signal of the standard battery (214). 3. The remote calibration system for transformer calibration instruments according to claim 1, wherein the AC signal includes a working current signal, a working voltage signal, a differential current signal and a differential voltage signal, and the AC signal The conditioning module (211) includes a program-controlled amplifier U1, a program-controlled amplifier U5 and a relay J3; the input end of the program-controlled amplifier U1 is connected to the operating current or operating voltage output of the standard device (22), and the output of the program-controlled amplifier U1 end is connected to the first auxiliary contact of the relay J3, the input end of the program-controlled amplifier U5 is connected to the output end of the differential current signal or differential voltage signal of the standard device (22), and the program-controlled amplifier U5 The output terminal of the relay J3 is connected to the second auxiliary contact of the relay J3, and the third auxiliary contact of the relay J3 is connected to the input terminal of the standard device amplitude processing module (212); The program-controlled amplifier U1 is used to amplify or reduce the working current signal or working voltage signal output by the standard device (22) to a first design threshold; The program-controlled amplifier U5 is used to amplify or reduce the differential operating current signal or the differential voltage signal output by the standard device (22) to a second design threshold. 4. the instrument transformer calibration instrument remote calibration system according to claim 3, it is characterized in that, described whole inspection traceability device (21) also comprises standard device phase processing module (216), and described standard device phase processing module ( The input end of 216) is connected to the output end of the AC signal conditioning module (211), and the output end of the standard device phase processing module (216) is connected to the input end of the control module (215); The standard device phase processing module (216) is used to measure the phase of the working and differential AC vector signals, and transmit the phase value to the control module (215) for calculation processing, and the control module (215) transmits the phase measurement result to the smart terminal (300), so that the smart terminal (300) synchronously transmits the phase measurement result to the remote server (1); The control module (215) is used to receive the phase value, and judge whether the output phase value of the standard device (22) meets the standard according to the phase value, obtain a third judgment result, and compare the third judgment result Synchronously transmitted to the intelligent terminal (300). 5. The remote calibration system for transformer calibration instruments according to claim 4, wherein the standard device phase processing module (216) includes a first zero-crossing detection sub-module Φ6, a second zero-crossing detection sub-module Φ4 , the first frequency divider Φ5, the second frequency divider Φ3, the NAND gate Φ1, the phase-locked loop Φ8, the third frequency divider Φ7 and the AND gate Φ2; The input terminal of the first zero-crossing detection sub-module Φ6 is connected to the output terminal of the program-controlled amplifier U1, and the output terminals of the first zero-crossing detection sub-module Φ6 are respectively connected to the input of the first frequency divider Φ5 end and the input end of the phase-locked loop Φ8, the output end of the first frequency divider Φ5 is connected to the first input end of the NAND gate Φ1, the output end of the phase-locked loop Φ8 is connected to the The first input end of the AND gate Φ2, the input end of the third frequency divider Φ7 is connected to the output end of the phase-locked loop Φ8, and the output end of the third frequency divider Φ7 is connected to the phase-locked loop The input terminal of Φ8; The input end of the second zero-crossing detection sub-module Φ4 is connected to the output end of the program-controlled amplifier U5, and the output end of the second zero-crossing detection sub-module Φ4 is connected to the input end of the second frequency divider Φ3 , the output end of the second frequency divider Φ3 is connected to the second input end of the NAND gate Φ1, the output end of the NAND gate Φ1 is connected to the second input end of the AND gate Φ2, the The output end of the AND gate Φ2 is connected to the input end of the control module (215). 6. A remote calibration method for a transformer calibration instrument applied to the remote calibration system for a transformer calibration instrument according to any one of claims 1-5, wherein the method comprises: The standard device (22) disconnects the connection with the instrument to be checked (23) and connects with the whole inspection traceability device (21) in response to the traceability command issued by the intelligent terminal (300), generating and Transmitting the AC signal to the AC signal conditioning module (211); The AC signal conditioning module (211) receives the AC signal, and amplifies or reduces the AC signal to obtain an amplified or reduced AC signal, and converts the amplified or reduced AC signal to The signal is transmitted to the standard device amplitude processing module (212) and the standard device phase processing module (216); The standard device amplitude processing module (212) performs self-inspection before obtaining the amplified or reduced AC signal, and obtains the satellite time-frequency signal under the reference clock provided by the satellite timing module (213) and the The standard voltage signal provided by the standard battery (214), and the first frequency signal converted from the satellite time-frequency signal and the standard voltage signal is transmitted to the control module (215), wherein the first frequency signal Standard voltage frequency signal including standard voltage signal conversion; The control module (215) judges whether the standard device amplitude processing module (212) passes the self-test according to the satellite time-frequency signal and the first frequency signal, obtains a first judgment result, and sends the first The judgment result is transmitted to the smart terminal (300), so that the smart terminal (300) synchronously transmits the first judgment result to the remote server (1); When the first judgment result is that the standard device amplitude processing module (212) passes the self-test, the standard device amplitude processing module (212) switches to the traceability circuit of the standard device (22) to receive the amplified or The reduced AC signal, and the frequency conversion of the amplified or reduced AC signal and after obtaining the satellite time-frequency signal AND gate U4 under the reference clock with the satellite timing module (213), obtains the first a second frequency signal, inputting the second frequency signal and the satellite time-frequency signal into the control module (215); The control module (215) judges whether the amplitude of the standard device (22) meets the standard according to the received second frequency signal and the satellite time-frequency signal, obtains a second judgment result, and converts the second The judgment result is transmitted to the smart terminal (300), so that the smart terminal (300) synchronously transmits the second judgment result to the remote server (1); The standard device phase processing module (216) measures the phase value of the AC signal, and inputs the phase value into the control module (215); The control module (215) receives the phase value, and judges whether the output phase value of the standard device (22) meets the standard according to the phase value, obtains a third judgment result, and transmits the third judgment result to The intelligent terminal (300), so that the intelligent terminal (300) synchronously transmits the third judgment result to the remote server (1); the intelligent terminal (300) according to the received second judgment result Determine whether the amplitude and phase of the standard device (22) meet the standard with the third judgment result; After the amplitude and phase of the standard device (22) meet the standard, the intelligent terminal (300) controls the standard device (22) to be electrically connected to the instrument to be tested (23), and at the same time disconnects the The connection of the whole inspection and traceability device (21), using the standard device (22) to verify or calibrate the to-be-inspected instrument (23). 7. The method according to claim 6, characterized in that, after utilizing the standard device (22) to verify or calibrate the instrument to be tested (23), the method further comprises: Obtain the captured video image of the instrument to be inspected (23); Perform feature extraction based on deep learning on the captured video based on a preset feature model to obtain accurate display information of the instrument to be checked (23); Generate a verification certificate or a calibration report and a result notification of the instrument to be tested (23) based on the indication information and the electrical signal data output by the standard device (22); An instrument file for the instrument to be inspected (23) is generated based on the verification certificate or calibration report and the result notification, and stored. 8. An intelligent terminal, characterized in that it includes a processor, and the processor is coupled with a memory; The processor is configured to execute the computer program stored in the memory, so that the smart terminal executes the method according to claim 6 or 7.

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