CN115656910B

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

Info

Publication number: CN115656910B
Application number: CN202211678776.XA
Authority: CN
Inventors: 马斌; 韩海洲; 马博渊; 赵园; 程昱舒; 马娟; 邢永明; 曹雁娜
Original assignee: TAIYUAN SHANHU TECHNOLOGY CO LTD
Current assignee: TAIYUAN SHANHU TECHNOLOGY CO LTD
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-04-21
Anticipated expiration: 2042-12-27
Also published as: CN115656910A

Abstract

The application relates to a remote calibration system, a remote calibration method and remote calibration equipment for a transformer calibration instrument, and relates to the technical field of transformer calibration instruments in electric energy metering devices, wherein the remote calibration system comprises a remote server and a field calibration subsystem, and the remote server is connected with the field calibration subsystem through a network; the on-site calibration subsystem comprises a whole detection traceability device, a standard device, a camera and an intelligent terminal, wherein the whole detection traceability device is respectively connected with the intelligent terminal and the standard device, and the standard device is electrically connected with an instrument to be detected; the remote server is used for monitoring at least one on-site calibration subsystem; the whole detection tracing device is used for tracing the standard device and realizing self-detection, and transmitting the calibration result to the intelligent terminal and the remote server; the intelligent terminal is used for transmitting traceability, self-checking and/or verification calibration commands and receiving detection data information; the camera is used for realizing online monitoring. The method has the effects of calibrating the standard device and the instrument to be detected anytime and anywhere and accelerating magnitude tracing and transmission.

Description

Remote calibration system, method and equipment for mutual inductor calibration instrument

Technical Field

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

Background

The electric energy metering device comprises a transformer and secondary circuit equipment thereof, various electric energy meters and sampling control terminals thereof, wherein the transformer calibration instrument refers to the calibration equipment of the transformer and the secondary circuit thereof, and comprises a transformer calibration instrument, a secondary circuit voltage drop and load tester, a transformer load box calibrator, a transformer transformation ratio tester and the like, and the whole calibration device of the transformer calibration instrument is standard device equipment for calibrating and calibrating the transformer calibration instrument. Every year, each transformer checking instrument and standard device equipment need to be regularly sent to check, calibrate and trace to the source, and the transformer checking instrument is applied to the detection of the transformer and the secondary circuit thereof in the electric power metering device of the power grid, so that the transformer and the secondary circuit thereof can meet the power grid specification.

In the related magnitude transmission process, the transformer calibration instrument is required to send other standard equipment such as the transformer calibration instrument to an upper calibration mechanism for calibration and calibration at regular intervals before the transformer and the secondary circuit thereof are calibrated, the regulation specifies that the calibration period of the transformer calibration instrument is one year, the standard device of the transformer calibration instrument is usually required to be sent to a third party detection mechanism with a higher level or qualification for calibration before the transformer calibration instrument is calibrated, the standard device of the transformer calibration instrument is usually the integral calibration device of the transformer calibration instrument, and the transformer and the secondary circuit thereof are calibrated and detected after magnitude tracing is completed.

On the one hand, when the equipment such as the transformer calibration instrument and the standard device thereof are sent to a laboratory of an upper-level calibration mechanism for calibration and calibration, jolting and rough handling are frequently encountered in the transportation process, so that the damage probability of the instrument is increased, the magnitude transmission is not timely and even the measurement is not aligned, and when the transformer calibration instrument and the standard device thereof are calibrated and calibrated, professional testers are required to operate, and the equipment is often in line waiting, so that the time and the labor are consumed and the efficiency is low.

On the other hand, when calibrating the equipment such as the transformer calibration instrument and the standard device thereof, and the like, the equipment is all carried out in a laboratory environment, the national metrological calibration procedure has higher requirements on the laboratory, the on-site calibration is not in the same environment state and in the same time period, and the additional influence on the error precision can cause inaccurate calibration results and influence on use.

On the other hand, as the mutual inductor checking instrument has no related national or industry communication protocol, only the national electric network company enterprise standard Q/GDW1987-2013 mutual inductor checking instrument communication protocol is disclosed, the communication protocols of mutual inductor checking instruments of other manufacturers are not disclosed, and at present, the technical parameters and test indication acquisition of the instrument to be checked are manually recorded through human eye identification, or the instrument manufacturer to be checked is required to provide the communication protocols, or the communication protocols of the instrument to be checked are deciphered, but the method can touch related laws, the detection efficiency is affected, the authenticity of the data in the detection process cannot be confirmed, and the magnitude tracing and the transmission efficiency are reduced.

Disclosure of Invention

In order to calibrate and verify a standard device and an instrument to be detected anytime and anywhere, improve detection efficiency, accurately calibrate and verify results and accelerate magnitude tracing and transmission efficiency, the application provides a remote calibration system, a remote calibration method and remote calibration equipment for a transformer calibration instrument.

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

the remote calibration system for the transformer calibration instrument comprises a remote server and at least one field calibration subsystem, wherein the remote server is connected with the field calibration subsystem through a network; the on-site calibration subsystem comprises a whole detection traceability device, a standard device, a camera and an intelligent terminal, wherein the whole detection traceability device is respectively connected with the intelligent terminal and the standard device, the camera is electrically connected with the intelligent terminal, and the standard device is electrically connected with an instrument to be detected which needs to be detected or calibrated;

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

the whole detection traceability device is used for realizing self-detection and traceability of the standard device;

the standard device is used for detecting or calibrating the instrument to be detected to obtain a detection and calibration result, and transmitting the detection and calibration result to the intelligent terminal so that the intelligent terminal synchronously transmits the detection and calibration result to the remote server;

The intelligent terminal is used for transmitting verification and calibration commands and/or self-checking traceability commands and receiving detection results transmitted by the whole-checking traceability device, the standard device, the camera and the instrument to be checked;

the camera is used for carrying out online monitoring on technical parameters and display readings of the instrument to be detected to obtain a shot video image, carrying out image AI autonomous identification on the shot video image to obtain an identification result, and transmitting the identification result to the intelligent terminal so that the intelligent terminal can transmit the identification result to the remote server.

By adopting the technical scheme, when the remote verification or calibration is carried out on the instrument to be detected, the intelligent terminal transmits the calibration command, the tracing command or the self-checking command to the whole detection tracing device, the whole detection tracing device carries out self-checking or calibrating according to the received calibration command or the self-checking command, the whole detection tracing device firstly realizes self-checking according to the received self-checking command, after the self-checking is qualified, the tracing command of the standard device is executed, the instrument to be detected is verified or calibrated according to the calibration command after the tracing accords with the standard, and in the process of self-checking or tracing the instrument to be detected, the intelligent terminal transmits the self-checking tracing result or the verification result to the remote server, so that the remote server carries out full-flow supervision monitoring on the field calibration subsystem.

Optionally, the whole detection traceability device comprises an alternating current signal conditioning module, a standard device amplitude processing module, a satellite time service module, a standard battery and a control module;

the control end of the standard device is electrically connected with the intelligent terminal, the output end of the standard device is electrically connected with the input end of the alternating current signal conditioning module, the output end of the alternating current signal conditioning module is electrically connected with the first input end of the standard device amplitude processing module, the output end of the standard device amplitude processing module is electrically connected with the input end of the control module, the output end of the control module is electrically connected with the intelligent terminal, the output end of the satellite timing module is electrically connected with the second input end of the standard device amplitude processing module, and the output end of the standard battery is electrically connected with the third input end of the standard device amplitude processing module;

the standard device is used for responding to a start tracing command transmitted by the intelligent terminal, disconnecting the connection with the instrument to be detected and connecting the whole detecting tracing device, and generating and transmitting an alternating current signal to the alternating current signal conditioning module;

the alternating current signal conditioning module is used for receiving the alternating current signal, amplifying or shrinking the alternating current signal to obtain an amplified or shrunk alternating current signal, and transmitting the amplified or shrunk alternating current signal to the standard device amplitude processing module;

The standard device amplitude processing module is used for performing self-checking before the amplified or reduced alternating current signal is obtained, acquiring a satellite time-frequency signal under a reference clock provided by the satellite time service module and a standard voltage signal provided by the standard battery, and transmitting the satellite time-frequency signal and a first frequency signal converted by the standard voltage signal to the control module, wherein the first frequency signal comprises a standard voltage frequency signal converted by the standard voltage signal;

the control module is used for judging whether the amplitude processing module of the standard device is qualified in self-checking according to the satellite time-frequency signal and the first frequency signal to obtain a first judgment result, and transmitting the first judgment result to the intelligent terminal so that the intelligent terminal synchronously transmits the first judgment result to the remote server;

after the standard device amplitude processing module is qualified by self-checking, the standard device amplitude processing module is also used for switching to a standard device tracing circuit, receiving the amplified or reduced alternating current signal, performing frequency conversion on the amplified or reduced alternating current signal, acquiring an AND gate phase of a satellite time-frequency signal under a reference clock with the satellite time service module, obtaining a second frequency signal, and inputting the second frequency signal and the satellite time-frequency signal into the control module;

The control module is further configured to determine whether the amplitude of the standard device meets a standard according to the received second frequency signal and the satellite time-frequency signal, obtain a second determination result, and transmit the second determination result to the intelligent terminal, so that the intelligent terminal synchronously transmits the second determination result to the remote server.

Optionally, the standard device amplitude processing module comprises 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 alternating current signal conditioning module, the output end of the RMS-DC true effective value converter U2 is electrically connected with a first auxiliary contact of the relay J4, a second auxiliary contact of the relay J4 is electrically connected with the standard battery, a third auxiliary contact of the relay J4 is respectively electrically connected with the digital signal input end of the control module and the input end of the V/F voltage frequency converter U3, the output end of the V/F voltage frequency converter U3 and the output end of the satellite time service module are both connected with the input end of the AND gate U4, and the output end of the AND gate U4 is connected with the pulse signal input end of the control module;

The RMS-DC true effective value converter U2 is configured 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 for controlling the conduction of the RMS-DC true effective value converter U2 and the V/F voltage frequency converter U3 when the standard device is calibrated, or controlling the conduction of the standard battery and the V/F voltage frequency converter U3 when the self-test is performed;

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

the and gate U4 is configured to perform a phase-separating operation on the pulse signal and the time-frequency signal, obtain a first frequency signal of the amplified or reduced ac signal under a reference clock, and transmit the first frequency signal and the satellite time-frequency signal to the control module;

the control module is used for judging whether the V/F voltage frequency converter U3 is qualified through self-checking according to the first frequency signal of the standard battery.

Optionally, the alternating current signal includes a working current signal, a working voltage signal, a differential current signal and a differential voltage signal, and the alternating current signal conditioning module 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 with the working current or working voltage output end of the standard device, the output end of the program-controlled amplifier U1 is connected with the first auxiliary contact of the relay J3, the input end of the program-controlled amplifier U5 is connected with the output end of the differential current signal or differential voltage signal of the standard device, the output end of the program-controlled amplifier U5 is connected with the second auxiliary contact of the relay J3, and the third auxiliary contact of the relay J3 is connected with the input end of the amplitude processing module of the standard device;

The program-controlled amplifier U1 is used for amplifying or reducing the working current signal or the working voltage signal output by the standard device to a design threshold value;

and the program-controlled amplifier U5 is used for amplifying or reducing the difference working current signal or the difference voltage signal output by the standard device to a design threshold value.

Optionally, the whole inspection tracing device further comprises a standard device phase processing module, wherein the input end of the standard device phase processing module is connected with the output end of the alternating current signal conditioning module, and the output end of the standard device phase processing module is connected with the input end of the control module;

the standard device phase processing module is used for measuring the phases of working and difference alternating current vector signals and transmitting phase values to the control module for operation processing, and the control module transmits phase measurement results to the intelligent terminal so that the intelligent terminal synchronously transmits the phase measurement results to the remote server;

the control module is used for receiving the phase value, judging whether the phase value output by the standard device meets the standard according to the phase value, obtaining a third judgment result, and synchronously transmitting 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 phase-locked loop Φ8, a third frequency divider Φ7, and a and gate Φ2;

the input end of the first zero-crossing detection submodule phi 6 is connected with the output end of the program-controlled amplifier U1, the output end of the first zero-crossing detection submodule phi 6 is respectively connected with the input end of the first frequency divider phi 5 and the input end of the phase-locked loop phi 8, the output end of the first frequency divider phi 5 is connected with the first input end of the NAND gate phi 1, the output end of the phase-locked loop phi 8 is connected with the first input end of the AND gate phi 2, the input end of the third frequency divider phi 7 is connected with the output end of the phase-locked loop phi 8, and the output end of the third frequency divider phi 7 is connected with the input end of the phase-locked loop phi 8;

the input end of the second zero-crossing detection sub-module phi 4 is connected to the output end of the program-controlled amplifier U5, the output end of the second zero-crossing detection sub-module phi 4 is connected to the input end of the second frequency divider phi 3, the output end of the second frequency divider phi 3 is connected to the second input end of the NAND gate phi 1, the output end of the NAND gate phi 1 is connected to the second input end of the AND gate phi 2, and the output end of the AND gate phi 2 is connected to the input end of the control module.

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

a method of remote calibration of a transformer verification instrument applied to the remote calibration system of a transformer verification instrument of any one of the first aspects, the method comprising:

the standard device responds to a starting tracing command sent by the intelligent terminal, is disconnected from the instrument to be detected and is connected with the whole detecting tracing device, and alternating current signals are generated and transmitted to an alternating current signal conditioning module;

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

the standard device amplitude processing module performs self-checking before the amplified or reduced alternating current signal is obtained, acquires a satellite time-frequency signal under a reference clock provided by the satellite time service module and a standard voltage signal provided by the standard battery, and converts the satellite time-frequency signal and the standard voltage signal into a first frequency signal and transmits the first frequency signal to the control module, wherein the first frequency signal comprises a standard voltage frequency signal converted by the standard voltage signal;

The control module judges whether the amplitude processing module of the standard device is qualified in self-checking according to the satellite time-frequency signal and the first frequency signal to obtain a first judgment result, and transmits the first judgment result to the 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 is qualified by self-inspection, the standard device amplitude processing module is switched to a standard device tracing circuit to receive the amplified or reduced alternating current signal, and the amplified or reduced alternating current signal is subjected to frequency conversion, and after the satellite time-frequency signal under the reference clock acquired by the satellite time service module passes through an AND gate phase of the standard device amplitude processing module, a second frequency signal is obtained, and the second frequency signal and the satellite time-frequency signal are input 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 to obtain a second judgment result, and transmits the second judgment result to the 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 alternating current signal and inputs the phase value into the control module;

the control module receives the phase value, judges whether the phase value output by the standard device meets the standard according to the phase value, obtains a third judgment result, and transmits the third judgment result to the intelligent terminal so that the intelligent terminal synchronously transmits the third judgment result to the remote server;

the intelligent terminal judges whether the amplitude and the phase of the standard device accord with the standard according to the received second judging result and the third judging result;

and when the amplitude and the phase of the standard device meet the standards, the intelligent terminal controls the standard device to be electrically connected with the instrument to be detected, and meanwhile, the intelligent terminal disconnects the whole detection traceability device, and the standard device is utilized to detect or calibrate the instrument to be detected.

Optionally, after the calibrating or calibrating the to-be-inspected instrument by using the standard device, the method further comprises:

acquiring a shooting video image of an instrument to be detected;

performing feature extraction based on deep learning on the shot video based on a preset feature model to obtain accurate instrument registration information to be detected;

Generating a verification certificate or a calibration report and a result notice of the instrument to be detected based on the indication information and the electric signal data output by the standard device;

and generating a to-be-detected instrument file of the to-be-detected instrument based on the verification certificate or the calibration report and the result notice, and storing the to-be-detected instrument file.

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

an intelligent terminal comprising a processor coupled to a memory;

the memory has stored thereon a computer program that can be loaded by a processor and that performs the method for remote calibration of a transformer verification instrument according to any one of the second aspects.

Drawings

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

Fig. 2 is a schematic circuit diagram of a whole inspection tracing device according to an embodiment of the present application.

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

Fig. 4 is a block diagram of a smart device according to an embodiment of the present application.

Reference numerals illustrate: 1. a remote server; 2. a field calibration subsystem; 21. the whole detection tracing device; 22. a standard device; 211. an alternating current signal conditioning module; 212. a standard device amplitude processing module; 213. a satellite time service module; 214. a standard battery; 215. a control module; 216. a standard device phase processing module; 23. an instrument to be detected; 24. a camera; 300. and (5) an intelligent terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to fig. 1 to 4 and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The embodiment of the application discloses a remote calibration system for a transformer calibration instrument. Referring to fig. 1, the remote calibration system of the transformer calibration instrument comprises a remote server 1 and at least one field calibration subsystem 2, wherein the remote server 1 is in network connection with all the field calibration subsystems 2; the on-site calibration subsystem 2 comprises a whole-detection traceability device 21, a standard device 22, a camera 24 and an intelligent terminal 300, wherein the whole-detection traceability device 21 is respectively connected with the intelligent terminal 300 and the standard device 22, the camera 24 is electrically connected with the intelligent terminal 300, and the standard device 22 is electrically connected with an instrument to be detected 23 which needs to be calibrated;

the remote server 1 is used for performing online real-time supervision and monitoring on at least one field calibration subsystem 2;

the whole detection traceability device 21 is used for realizing self-detection and traceability of the standard device 22, transmitting self-detection and/or traceability results to the intelligent terminal 300, and synchronously transmitting the self-detection and/or traceability results to the remote server 1 through the intelligent terminal 300;

The standard device 22 is used for calibrating and calibrating the instrument to be detected 23 to obtain a calibration result, transmitting the calibration result to the intelligent terminal 300, and synchronously transmitting the calibration result to the remote server 1 through the intelligent terminal 300;

the intelligent terminal 300 is used for transmitting verification calibration commands and/or self-checking traceability commands, and receiving detection data information transmitted by the whole-checking traceability device 21, the standard device 22, the camera 24 and the to-be-checked instrument 23.

The detection data information comprises verification and calibration results and self-detection traceability results; the instrument to be detected can be a transformer calibrator, a secondary voltage drop load tester, a transformer load box calibrator, a transformer transformation ratio tester and the like.

In this embodiment, one remote server 1 can connect to a plurality of field calibration subsystems 2, and monitor the detection processes of the plurality of field calibration subsystems 2 synchronously on-line and in real time through the internet. When the on-site calibration subsystem 2 performs verification or calibration on the instrument 23 to be detected, the intelligent terminal 300 firstly controls the whole detection tracing device 21 to realize self-detection, and when the whole detection tracing device 21 is qualified in self-detection, the whole detection tracing device 21 is utilized to trace the standard device 22, and after the tracing of the standard device 22 accords with the standard, the whole detection tracing device 21 can be utilized to perform verification or calibration on the instrument 23 to be detected.

When the standard device 22 is used for calibrating the instrument 23 to be detected, the standard device 22 is disconnected from the whole detection traceability device 21 and is electrically connected with the instrument 23 to be detected, the intelligent terminal 300 transmits a calibration command to the standard device 22, so that the standard device 22 is used for calibrating the instrument 23 to be detected to obtain a calibration result, then the standard device 22 transmits the calibration result to the intelligent terminal 300, the intelligent terminal 300 transmits the received calibration result to the remote server 1, and the remote server 1 stores the calibration result.

In this embodiment, the verification or calibration result includes a verification certificate and a calibration report, and a result notice is issued for the to-be-detected instrument that is not qualified for verification.

As an optional implementation manner of this embodiment, the whole-detection traceability device 21 includes an ac signal conditioning module 211, a standard device amplitude processing module 212, a satellite time service module 213, a standard battery 214, and a control module 215;

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

The standard device 22 is used for responding to a self-checking instruction transmitted by the intelligent terminal 300, disconnecting the connection with the instrument to be checked 23 and connecting the instrument to be checked with the whole-detection traceability device 21, and generating and transmitting an alternating current signal to the alternating current signal conditioning module;

the ac signal conditioning module 211 is configured to receive an ac electrical signal, amplify or reduce the ac electrical signal to obtain an amplified or reduced ac electrical signal, and transmit the amplified or reduced ac electrical signal to the standard device amplitude processing module 212;

the standard device amplitude processing module 212 is configured to perform self-checking before obtaining the amplified or reduced ac signal, obtain a satellite time-frequency signal under the reference clock provided by the satellite time service module 213 and a standard voltage signal provided by the standard battery 214, and transmit the satellite time-frequency signal under the reference clock and a first frequency signal converted by the standard voltage signal to the control module 215, where the first frequency signal includes a standard voltage frequency signal converted by the standard voltage signal;

the control module 215 is configured to determine whether the standard device amplitude processing module 212 is self-checked to be qualified according to the satellite time-frequency signal and the first frequency signal under the reference clock, obtain a first determination result, transmit the first determination result to the intelligent terminal 300, and synchronously transmit the first determination result to the remote server 1 through the intelligent terminal 300;

After the standard device amplitude processing module 212 is qualified by self-inspection, the standard device amplitude processing module 212 is further configured to switch to a tracing circuit of the standard device 22, receive the amplified or reduced ac signal, perform frequency conversion on the amplified or reduced ac signal, obtain a second frequency signal after the satellite time-frequency signal under the reference clock passes through an and gate phase of the standard device amplitude processing module 212 with the satellite time service module 213, and input the second frequency signal and the satellite time-frequency signal into the control module 215;

the control module 215 is further configured to determine whether the standard device 22 meets the standard according to the received second frequency signal and the satellite time-frequency signal, obtain a second determination result, transmit the second determination result to the intelligent terminal 300, and synchronously transmit the second determination result to the remote server 1 through the intelligent terminal 300.

In this embodiment, before the to-be-detected instrument 23 is calibrated, the standard device 22 needs to be traced to ensure the accuracy of the to-be-detected instrument 23 calibration.

When the standard device 22 performs tracing, firstly, the connection with the instrument to be detected 23 is disconnected to connect the whole detecting and tracing device 21 in response to the tracing command, the standard device 22 is started to trace the source, the standard device 22 transmits the ac signal to the ac signal conditioning module 211, and 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, where the ac signal includes a working voltage signal, a working current signal, a differential current signal and a differential voltage signal.

Before tracing the standard device 22 according to the amplified or reduced ac signal, the standard voltage signal of the standard battery 214 is converted into a frequency signal under the reference clock and a satellite time-frequency signal under the reference clock of the satellite time service module 213, the standard device amplitude processing module 212 is self-checked, whether the standard device amplitude processing module 212 is qualified or not is judged, a first judgment result is obtained, after the standard device amplitude processing module 212 is qualified, the standard device 22 is traced by the standard device amplitude processing module 212, that is, the amplified or reduced ac signal is converted into a dc voltage signal, then the dc voltage signal and the satellite time-frequency signal are transmitted into the control module 215 after being matched and processed by the standard device amplitude processing module 212 and the satellite time service module 213, the control module 215 judges whether the standard device 22 meets the standard according to the received processed dc voltage signal and the satellite time-frequency signal, the second judgment result is obtained, and then the control module 215 synchronously transmits the first judgment result and the second judgment result to the intelligent terminal 300, and synchronously transmits the intelligent terminal 300 to the remote server 1 for archiving.

In this embodiment, the first determination 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 determination result includes that the standard device 22 meets the standard and that the standard device 22 does not meet the standard.

In this embodiment, the optional model of the standard device 22 is the integral calibrating device of the digital partial pressure transformer calibrator of the patent ZL201620305227.1, and the optional model of the satellite timing module 213 is any one or a combination of several of a GPS satellite timing module, a beidou satellite timing module, a gnomonas satellite timing module and a galileo satellite timing module; an alternative model of the control module 215 is an MCU microprocessor of STM32F103C8T 6.

As an alternative implementation of the present embodiment, the standard device amplitude processing module 212 includes an RMS-DC true effective value converter U2, a V/F voltage-to-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 alternating current signal conditioning circuit, the output end of the RMS-DC true effective value converter U2 is electrically connected with a first auxiliary contact of the relay J4, a second auxiliary contact of the relay J4 is electrically connected with the standard battery 214, a third auxiliary contact of the relay J4 is respectively electrically connected with the digital signal input end of the control module 215 and the input end of the V/F voltage frequency converter U3, the output end of the V/F voltage frequency converter U3 and the output end of the satellite time service module 213 are both connected with the input end of the AND gate U4, and the output end of the AND gate U4 is connected with the pulse signal input end of the control module 215;

The RMS-DC true effective value converter U2 is used for converting the amplified or reduced alternating current signal into a digital signal and inputting the digital signal into the V/F voltage frequency converter U3;

the relay J4 is used for controlling 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 controlling the conduction of the standard battery 214 and the V/F voltage frequency converter U3 when the self-test is performed;

the V/F voltage frequency converter U3 is configured to convert a digital signal into a pulse signal, and transmit the pulse signal into the and gate U4;

the and gate U4 is configured to phase the pulse signal and the satellite time-frequency signal to obtain a second frequency signal of the ac signal amplified by the reference clock, and transmit the second frequency signal and the satellite time-frequency signal under the reference clock to the control module 215.

When the standard device amplitude processing module 212 is self-checked, the control module 215 controls the relay J4 to conduct the standard battery 214 and the V/F voltage-frequency converter U3, the standard battery 214 outputs 1V standard voltage to the V/F voltage-frequency converter U3, the V/F voltage-frequency converter U3 converts the 1V standard voltage signal into a pulse signal, then the pulse signal is transmitted into the and gate U4, then the satellite time-frequency signal under the reference clock received by the satellite time service module 213 is synchronously transmitted into the and gate U4, the and gate U4 phase-stores the pulse signal and the satellite time-frequency signal to obtain a first frequency signal of the standard battery 214 under the reference clock, then the first frequency signal of the standard battery 214 under the reference clock is transmitted into the control module 215, and the control module 215 determines whether the V/F voltage-frequency converter U3 is qualified according to the first frequency signal converted by the standard battery 214 under the reference clock through the V/F voltage-frequency converter U3 and a preset frequency signal.

For example, when the reference clock of the satellite is 1 second, the second conversion frequency is 10kHz, and the standard battery 214 is a 0.01-level 1V second-class standard battery 214, the voltage output by the standard battery 214 is 1V, and when the frequency of the 1V standard voltage converted from the 1V standard voltage to the pulse signal by the V/F voltage frequency converter U3 is 10kHz, the V/F voltage frequency converter U3 meets the standard, and the standard device 22 can be calibrated by using the V/F voltage frequency converter U3. When the first conversion frequency exceeds the preset range, wherein the preset range is 9.998kHz-10.002kHz, the V/F voltage-frequency converter U3 has an error at this time, and the V/F voltage-frequency converter U3 needs to be maintained or replaced, and the standard device 22 can be traced after the self-inspection is qualified again.

As an alternative implementation manner of the present embodiment, the ac signal conditioning module 211 includes a programmable amplifier U1 for amplifying or reducing an operating current or an operating voltage signal, a primary current 1A and 5A for conditioning the operating current signal, a resistor R0 for converting the operating current signal into a secondary current fixed by 20mA through electromagnetic conversion, a resistor R1 for operating voltage division, a resistor R2 and a resistor R6 for amplifying a differential current or a differential voltage signal programmable amplifier U5, a differential current dividing resistor R3 and a resistor R7, a differential voltage resistor R4, a resistor R5 and a resistor R8, a relay J1 for switching the operating current and the operating voltage signal, a relay J2 for switching the differential current and the differential voltage signal, a relay J5 for switching the operating voltage class of 100V/, 100V, a relay J6 for switching the differential current signal of the operating current class of 100V/, and the differential voltage class of 100V, and the differential voltage relay J7 for switching the operating voltage class of 100V, wherein the present embodiment is a precision resistor.

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

In this embodiment, the connection manner of the differential voltage and the circuit for amplifying the differential current is similar to the connection manner of the working current and the working voltage, and will not be described herein.

When tracing the standard device 22, the standard device 22 outputs different types of alternating current signals, and then the amplified or reduced alternating current signals are transmitted to the standard device amplitude processing module 212 after setting the detection points according to the rule of the JJG169 transformer calibrator so as to calibrate and trace the standard device 22.

For example, according to the current transformer verification procedure, when the working current signal to be detected is current 5A or 1A, the calibration points are 1%, 5%, 20%, 100% and 120%, the CT conditioned current signal of the current transformer passing through 1A-or-5A/20mA is 0.0002A, 0.001A, 0.004A, 0.02A and 0.024A, the voltage conversion signal is 0.01V, 0.05V, 0.2V, 1V and 1.2V, and the amplification factors of the signal to be detected are respectively multiplied by 100, ×20, ×5, ×1 and×1. The working current signal is other working current signals such as 5A or 1A, 0.5A and the like;

according to the verification rule of the voltage transformer, when the working voltage signal to be detected is 100V/[ V ] 3 or 100V, the calibration points are 20%, 50%, 80%, 100% and 120%, the conditioned voltage signals are 0.2V, 0.5V, 0.8V, 1V and 1.2V, and the amplification factors of the signals to be detected are corresponding to X5, [ X2 ], [ X1.25 ], [ X1 ]. The working voltage signal is 100V/V3 or 100V, and other working voltage signals such as 150V and 220V;

According to the current transformer verification procedure, the differential current signal to be detected generally does not exceed 10% of the working rated current 1A or 5A, the maximum differential current signal is 0.1A or 0.5A, the calibration points are 1%, 5%, 20%, 100% and 120%, the conditioned voltage signals are 0.01V, 0.05V, 0.2V, 1V and 1.2V, and the amplification factors of the signals to be detected are respectively multiplied by 1000, multiplied by 200, multiplied by 50, multiplied by 10 and multiplied by 10;

according to the voltage transformer verification procedure, the differential pressure signal to be detected generally does not exceed 10% of the current 100V/[ V ] 3 or 100V, namely 5.7737V or 10V, the calibration points are 20%, 50%, 80%, 100%, 120%, the conditioning voltage signals are 0.2V, 0.5V, 0.8V, 1V and 1.2V, and the amplification factors of the signal to be detected are respectively x 50, [ x 20 ], [ x 12.5 ], [ x 10 ] and [ x 10 ].

In order to make the ac vector signal of the standard device 22 truly and accurately, the whole inspection tracing device 21 further includes a standard device phase processing module 216, wherein the input end of the standard device phase processing module 216 is respectively connected to the output end a and the output end B 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 configured to measure the phase values of the working and difference ac vector signals and transmit the phase values to the control module 215;

The control module 215 is configured to receive the phase value, determine whether the phase value meets a standard according to the phase value output by the standard device 22, obtain a third determination result, transmit the third determination result to the intelligent terminal 300, and synchronously transmit the third determination result to the remote server 1 through the intelligent terminal 300;

after the ac signal conditioning module 211 processes the ac signal output by the standard device 22, it is necessary to determine the phase of the ac signal after the amplification or reduction process, and further determine the accuracy of the standard device 22 in an ac vector signal processing manner.

As an alternative 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, a second frequency divider Φ3, a nand gate Φ1, a phase-locked loop Φ8, a third frequency divider Φ7, and a and gate Φ2;

The input end of the second zero-crossing detection sub-module phi 4 is connected to the output end of the program-controlled amplifier U5, the output end of the second zero-crossing detection sub-module phi 4 is connected to the input end of the second frequency divider phi 3, the output end of the second frequency divider phi 3 is connected to the second input end of the NAND gate phi 1, the output end of the NAND gate phi 1 is connected to the second input end of the AND gate phi 2, and the output end of the AND gate phi 2 is connected to the input end of the control module 215.

In this embodiment, in the process of calibrating the standard device 22, the standard device 22 transmits an ac electrical signal to the standard device phase processing module 216 through the ac signal conditioning module 211, the ac signal conditioning module 211 amplifies or reduces the ac working voltage, the ac working current, the differential working voltage or the differential working current to a design threshold value of 1V (100% of the calibration point), and simultaneously transmits the ac working voltage or the differential working voltage to the first zero-crossing detection sub-module Φ6 and the second zero-crossing detection sub-module Φ4, the ac working current or the differential working current transmits the ac working current or the differential working current to the second zero-crossing detection sub-module Φ4, the ac working voltage or the differential working current is converted into a 50Hz positive pulse signal through the first zero-crossing detection sub-module Φ6 and the second zero-crossing detection sub-module Φ4, and then the positive pulse signals of the ac working signal and the differential working signal are respectively converted into 0.5Hz by the first frequency divider Φ5 and the second frequency divider Φ3, and the phase difference is obtained through the nand gate Φ1; the zero crossing pulse signals of the alternating current working voltage or the alternating current working current are simultaneously input into a phase-locked loop phi 8 and a third frequency divider phi 7 to multiply the power frequency signals of 50Hz to 1080000Hz, the phase values of a NAND gate phi 1 and 1080000Hz are simultaneously generated by an AND gate phi 2 to generate phase pulse signals, the phase pulse signals are transmitted to a counter of the control module 215 to be counted, phase measurement is completed, and phase measurement data are obtained.

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

Only if both the amplitude and the phase of the standard device 22 are determined to be standard-compliant by the standard device amplitude processing module 212 and the standard device phase processing module 216, the standard device 22 is standard-compliant.

The standard 22 is able to verify or calibrate the instrument 23 to be tested when the standard amplitude processing module 212 and the standard 22 complete the self-test and the trace-back sequentially and the standard phase processing module 216 measures the phase accurately.

After the self-inspection and the tracing of the whole-inspection tracing device 21 are completed, the intelligent terminal 300 starts the calibration or calibration procedure of the standard device 22, and at this time, the standard device 22 is controlled to disconnect from the whole-inspection tracing device 21 and switch connection to the instrument to be inspected 23, and the calibration or calibration of the instrument to be inspected 23 is started.

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

The camera 24 is used for performing online monitoring on technical parameters and display values of the instrument 23 to be detected, obtaining a photographed video image, performing image AI autonomous recognition on the photographed video image, obtaining a recognition result, transmitting the recognition result to the intelligent terminal 300, and synchronously transmitting the recognition result to the remote server 1 through the intelligent terminal 300.

After the shot video image is obtained, the shot video image is subjected to software deep learning recognition confirmation and then is converted into indicating value data of the instrument to be detected 23, the recognition rate is improved, the identification rate is transmitted to the intelligent terminal 300, the identification rate is synchronously transmitted to the remote server 1 through the Internet for online real-time supervision and monitoring, and the identification data is converted into error data according to the indicating value data, so that the instrument to be detected is conveniently detected or calibrated.

In this embodiment, it should be noted that, in the present application, the image AI autonomous identification is adopted in the prior art, so long as the functions of automatic light supplementing, autonomous zooming and autonomous identification can be implemented, and therefore, the present application is not described in any more detail and is not limited in any way.

After obtaining the indication data of the to-be-detected instrument 23, the intelligent terminal 300 can judge the accuracy of the to-be-detected instrument 23 according to the indication data of the to-be-detected instrument 23, so that a verification certificate or a calibration report is issued according to the accuracy meeting the standard, and a result notice is issued without meeting the standard.

The implementation principle of the remote calibration system of the transformer calibration instrument provided by the embodiment of the application is as follows: before calibrating the instrument to be detected 23, the whole detection tracing device 21 needs to be self-inspected, in the self-inspected process of the whole detection tracing device 21, firstly, a relay J4 is controlled to enable a standard battery 214 and a V/F voltage frequency converter U3 to be conducted, standard voltage output by the standard battery 214 is input to an AND gate U4, satellite time-frequency signals under a reference clock acquired by a satellite time service module 213 are transmitted to the AND gate U4, after being subjected to the AND gate U4 phase, first frequency signals under the reference clock converted by the V/F voltage frequency converter U3 are obtained, the first conversion frequency is input to a control module 215, the control module 215 judges whether the V/F voltage frequency converter U3 is qualified according to the received first frequency signals under the reference clock and the satellite time-frequency signals, and when the error of the first frequency signals relative to the satellite time-frequency signals is within the accuracy range of the V/F voltage frequency converter U3, the control module 215 judges whether 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 determines that the V/F voltage-frequency converter U3 is not qualified, and generates an alarm signal for operation and replacement.

After the V/F voltage-to-frequency converter U3 is determined to be qualified, the standard device 22 is controlled to be disconnected from the to-be-detected instrument 23, the standard device 22 is calibrated, when the standard device 22 is calibrated, the standard device 22 outputs an alternating current signal to the alternating current signal conditioning module 211, then the alternating current signal is amplified or reduced through the corresponding programmable amplifier U1 and the programmable amplifier U5, the amplified or reduced alternating current signal is respectively transmitted to the standard device amplitude processing module 212 and the standard device phase processing module 216, the standard device amplitude processing module 212 determines the amplitude of the alternating current signal to obtain a second determination result, the standard device phase processing module 216 determines the phase difference of the alternating current signal to obtain a third determination result, the control module 215 transmits the second determination result and the third determination result to the intelligent terminal 300 and synchronously transmits the second determination result and the third determination result to the remote server 1 through the intelligent terminal 300, and the intelligent terminal 300 determines whether the standard device 22 meets the standard according to the second determination result and the third determination result.

When the second judgment result and the third judgment result are both in accordance with the standard, the standard device 22 can be judged to be in accordance with the standard; when the second determination result and/or the third determination result is that the standard device 22 does not meet the standard, the standard device 22 does not meet the standard.

After the standard determining device 22 meets the standard, the standard controlling device 22 disconnects the whole detecting and tracing device 21 and switches to connect with the instrument to be detected 23, and the instrument to be detected 23 is detected or calibrated.

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

in step S101, the standard device 22 disconnects the to-be-inspected instrument 23 and connects with the whole-inspection tracing device 21 in response to the start tracing command sent by the intelligent terminal 300, and generates and transmits an ac signal to the ac signal conditioning module 211.

In step S102, the ac signal conditioning module 211 receives the ac electrical signal, amplifies or reduces the ac electrical signal to obtain an amplified or reduced ac electrical signal, and transmits the amplified or reduced ac electrical signal to the standard device amplitude processing module 212 and the standard device phase processing module 216.

In step S103, the standard device amplitude processing module 212 performs self-checking before obtaining the amplified or reduced ac signal, obtains the satellite time-frequency signal under the reference clock provided by the satellite time service module 213 and the standard voltage signal provided by the standard battery 214, and converts the satellite time-frequency signal and the standard voltage signal into a first frequency signal and transmits the first frequency signal to the control module 215, where the first frequency signal includes the standard voltage frequency signal converted by the standard voltage signal.

In step S104, the control module 215 determines whether the standard device amplitude processing module 212 is qualified for self-inspection according to the satellite time-frequency signal and the first frequency signal, obtains a first determination result, and transmits the first determination result to the intelligent terminal 300, so that the intelligent terminal 300 synchronously transmits the first determination result to the remote server 1.

In step S105, after the first determination result is that the standard device amplitude processing module 212 is self-inspected and qualified, the standard device amplitude processing module 212 switches to the standard device 22 tracing circuit, receives the amplified or reduced ac signal, performs frequency conversion on the amplified or reduced ac signal, obtains the second frequency signal after acquiring the satellite time-frequency signal and the gate U4 phase under the reference clock with the satellite time service module 213, and inputs the second frequency signal and the satellite time-frequency signal into the control module 215.

In step S106, the control module 215 determines whether the amplitude of the standard device 22 meets the standard according to the received second frequency signal and satellite time-frequency signal, so as to obtain a second determination result, and transmits the second determination result to the intelligent terminal 300, so that the intelligent terminal 300 synchronously transmits the second determination result to the remote server 1.

In step S107, the standard device phase processing module 216 is configured to measure a phase value of the ac signal and transmit the phase value to the control module 215.

In step S108, the control module 215 receives the phase value, determines whether the phase value output by the standard device 22 meets the standard according to the phase value range, obtains a third determination result, and transmits the third determination result to the intelligent terminal 300, so that the intelligent terminal 300 synchronously transmits the third determination result to the remote server 1.

In step S109, the intelligent terminal 300 determines whether the amplitude and the phase of the standard device 22 meet the standard according to the received second determination result and the third determination result.

In step S110, after the amplitude of the standard device 22 meets the standard, the intelligent terminal 300 controls the standard device 22 to be connected with the to-be-detected instrument 23, and simultaneously disconnects the whole detection traceability device 21, and the to-be-detected instrument 23 is calibrated or calibrated by using the standard device 22.

In this embodiment, after calibrating or calibrating the instrument to be inspected 23 using the standard device 22, the method further comprises: acquiring a photographed video image of the instrument to be inspected 23; performing feature extraction based on deep learning on the shot video based on a preset feature model to obtain accurate indication information of the to-be-detected instrument 23; generating a certification certificate or a calibration report of the instrument to be inspected 23 based on the indication information and the electrical signal data output by the standard device 22, and a result notice; a meter file for the meter 23 is generated based on the certification certificate or the calibration report and stored.

In this embodiment, in order to increase the authority of the true validity and data conclusion of the verification or calibration process, when the control standard device 22 performs verification or calibration on the instrument to be detected 23, online monitoring is performed on the indication value of the instrument to be detected 23 by using the shooting device to obtain a shooting video, feature extraction is performed on the indication value in the shooting video by using a preset feature model to obtain feature information, a verification certificate or calibration report and a result notice are generated according to the feature information, and an instrument file to be detected is generated according to the verification certificate or calibration report; the instrument file to be inspected includes a shot video and basic information of the instrument to be inspected 23, the basic information of the instrument to be inspected 23 includes a name, a number and a unit to which the instrument to be inspected 23 belongs, and the characteristic information includes a first conversion frequency and a second conversion frequency.

The obtained characteristic information is input into templates of verification certificates or calibration reports and result notices, two-dimensional codes related to the to-be-detected instrument 23 are generated in the templates of each verification certificate or calibration report and result notice, and a user can conveniently know the content of the calibration report by scanning the two-dimensional codes.

After obtaining the certification certificates or calibration reports and the result notices, storage in the intelligent terminal 300 is required for subsequent tracking and history knowledge of the instrument to be inspected 23.

Further, after generating the instrument file to be inspected of the instrument to be inspected 23 based on the certification certificate or the calibration report and the result notice, and storing, the method further comprises: establishing a digital twin model based on various real-time data acquisition information in the verification or calibration process; generating a calibration process file based on the digital twin model; transmitting the verification calibration process file to the remote server 1 through a blockchain technology; establishing an information database in the remote server 1; the calibration process file is stored based on the information database.

In this embodiment, since the calibration process of the to-be-detected instrument 23 is stored after the to-be-detected instrument 23 is calibrated, the possibility of losing is reduced, so that a digital twin model needs to be established according to real-time data acquisition information of the verification or calibration process, and a verification or calibration process file is generated according to the simulation process of the digital twin model, in order to ensure that the to-be-detected instrument 23 is not tampered and lost in the process of being transmitted to the remote server 1, the verification or calibration file is transmitted by adopting a blockchain transmission technology, so that the stability and the safety of the verification or calibration file in the transmission process can be enhanced, and the method is more convenient.

Meanwhile, an information database is established in the remote server 1, and the files of the to-be-detected instruments of each to-be-detected instrument 23 are stored in the information database, so that the verification or calibration process of the to-be-detected instrument 23 can be reserved, and archiving and inquiring are facilitated.

Fig. 4 is a block diagram of a structure of an intelligent terminal 300 according to an embodiment of the present application.

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

The processor 301 is configured to control the overall operation of the intelligent terminal 300, so as to complete all or part of the steps of the remote calibration method of the transformer calibration instrument; the memory 302 is used to store various types of data to support operation at the intelligent terminal 300, which may include, for example, instructions for any application or method operating on the intelligent terminal 300, as well as application-related data. The Memory 302 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as one or more of 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 (Programmable Read-Only Memory, PROM), read-Only 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, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 304 is used for wired or wireless communication between the intelligent terminal 300 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, or 4G, or a combination of one or more thereof, and accordingly the communication component 304 can include: wi-Fi part, bluetooth part, NFC part.

The intelligent terminal 300 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), digital signal processors (Digital Signal Processor, abbreviated as DSP), digital signal processing devices (Digital Signal Processing Device, abbreviated as DSPD), programmable logic devices (Programmable Logic Device, abbreviated as PLD), field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the remote calibration method of the transformer calibration instrument as given in the above embodiments.

Communication bus 305 may include a pathway to transfer information between the aforementioned components. The communication bus 305 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture ) bus, or the like. The communication bus 305 may 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 terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), car terminals (e.g., car navigation terminals), and the like, and fixed terminals such as digital TVs, desktop computers, and the like, and may also be a server, and the like.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the application referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or their equivalents is possible without departing from the spirit of the application. Such as the above-mentioned features and the technical features having similar functions (but not limited to) applied for in this application are replaced with each other.

Claims

1. The remote calibration system for the transformer calibration instrument is characterized by comprising a remote server (1) and at least one field calibration subsystem (2), wherein the remote server (1) is connected with the field calibration subsystem (2) in a network manner; the on-site calibration subsystem (2) comprises a whole-detection traceability device (21), a standard device (22), a camera (24) and an intelligent terminal (300), wherein the whole-detection traceability device (21) is respectively connected with the intelligent terminal (300) and the standard device (22), the camera (24) is electrically connected with the intelligent terminal (300), and the standard device (22) is electrically connected with an instrument to be detected (23) which needs verification or calibration;

the remote server (1) is used for performing online real-time supervision and monitoring on the at least one field calibration subsystem (2);

the whole detection traceability device (21) is used for realizing self-detection and traceability of the standard device (22);

the standard device (22) is used for calibrating the instrument (23) to be detected to obtain a calibration result, and transmitting the calibration result to the intelligent terminal (300) so that the intelligent terminal (300) synchronously transmits the calibration result to the remote server (1);

the intelligent terminal (300) is used for transmitting verification and calibration commands and/or self-checking traceability commands, and receiving detection results transmitted by the whole-checking traceability device (21), the standard device (22), the camera (24) and the instrument to be checked (23);

The camera (24) is used for carrying out online monitoring on technical parameters and display indication values of the instrument to be detected (23) to obtain a shooting video image, carrying out image AI autonomous identification on the shooting video image to obtain an identification result, and transmitting the identification result to the intelligent terminal (300) so that the intelligent terminal (300) can transmit the identification result to the remote server (1);

the whole-detection traceability device (21) comprises an alternating current signal conditioning module (211), a standard device amplitude processing module (212), a satellite time service module (213), a standard battery (214) and a control module (215);

the control end of the standard device (22) is electrically connected with the intelligent terminal (300), the output end of the standard device (22) is electrically connected with the input end of the alternating current signal conditioning module (211), the output end of the alternating current signal conditioning module (211) is electrically connected with the first input end of the standard device amplitude processing module (212), the output end of the standard device amplitude processing module (212) is electrically connected with the input end of the control module (215), the output end of the control module (215) is electrically connected with the intelligent terminal (300), the output end of the satellite timing module (213) is electrically connected with the second input end of the standard device amplitude processing module (212), and the output end of the standard battery (214) is electrically connected with the third input end of the standard device amplitude processing module (212);

The standard device (22) is used for responding to a start tracing command transmitted by the intelligent terminal (300), disconnecting the connection with the instrument to be detected (23) and connecting the whole detecting tracing device (21), and generating and transmitting an alternating current signal to the alternating current signal conditioning module (211);

the alternating current signal conditioning module (211) is used for receiving the alternating current signal, amplifying or shrinking the alternating current signal to obtain an amplified or shrunk alternating current signal, and transmitting the amplified or shrunk alternating current signal to the standard device amplitude processing module (212);

the standard device amplitude processing module (212) is configured to perform self-checking before obtaining the amplified or reduced ac signal, obtain a satellite time-frequency signal under a reference clock provided by the satellite time service module (213) and a standard voltage signal provided by the standard battery (214), and convert the satellite time-frequency signal and a first frequency signal converted from the standard voltage signal, and transmit the first frequency signal to the control module (215), where the first frequency signal includes a standard voltage frequency signal converted from the standard voltage signal;

the control module (215) is configured to determine whether the standard device amplitude processing module (212) is self-checked to be qualified according to the satellite time-frequency signal and the first frequency signal, obtain a first determination result, and transmit the first determination result to the intelligent terminal (300), so that the intelligent terminal (300) synchronously transmits the first determination result to the remote server (1);

After the standard device amplitude processing module (212) is qualified by self-inspection, the standard device amplitude processing module (212) is further used for switching to a standard device (22) tracing circuit, receiving the amplified or reduced alternating current signal, performing frequency conversion on the amplified or reduced alternating current signal, acquiring a satellite time-frequency signal under a reference clock by the satellite time service module (213), and obtaining a second frequency signal after passing through an AND gate phase of the standard device amplitude processing module (212), and inputting the second frequency signal and the satellite time-frequency signal into the control module (215);

the control module (215) is further configured to determine whether the amplitude of the standard device (22) meets a standard according to the received second frequency signal and the satellite time-frequency signal, obtain a second determination result, and transmit the second determination result to the intelligent terminal (300), so that the intelligent terminal (300) synchronously transmits the second determination result to the remote server (1).

2. The transformer verification instrument remote calibration system of claim 1, wherein the standard device amplitude processing module (212) comprises an RMS-DC true RMS value converter U2, a V/F voltage-to-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 an alternating current signal conditioning module (211), the output end of the RMS-DC true effective value converter U2 is electrically connected with a first auxiliary contact of a relay J4, a second auxiliary contact of the relay J4 is electrically connected with the standard battery (214), a third auxiliary contact of the relay J4 is respectively electrically connected with a digital signal input end of the control module (215) and an input end of the V/F voltage frequency converter U3, an output end of the V/F voltage frequency converter U3 and an output end of the satellite timing module (213) are both connected with an input end of the AND gate U4, and an output end of the AND gate U4 is connected with a pulse signal input end of the control module (215);

the relay J4 is used for controlling 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 traced, or controlling the conduction of the standard battery (214) and the V/F voltage frequency converter U3 when the self-test is performed;

The V/F voltage-to-frequency converter U3 is configured to convert the digital signal or the standard voltage signal of the standard battery (214) into a pulse signal, and transmit the pulse signal into the and gate U4;

the and gate U4 is configured to perform a phase-separating operation on the pulse signal and the satellite time-frequency signal, obtain a first frequency signal of the amplified or reduced ac signal under a reference clock, and transmit the first frequency signal and the satellite time-frequency signal to the control module (215);

the control module (215) is used for judging whether the V/F voltage frequency converter U3 is qualified in self-checking according to the first frequency signal of the standard battery (214).

3. The transformer verification instrument remote calibration system of claim 1, wherein the alternating current signal comprises an operating current signal, an operating voltage signal, a differential current signal, and a differential voltage signal, and the alternating current signal conditioning module (211) comprises a programmable amplifier U1, a programmable amplifier U5, and a relay J3; the input end of the program-controlled amplifier U1 is connected with the working current or working voltage output end of the standard device (22), the output end of the program-controlled amplifier U1 is connected with the first auxiliary contact of the relay J3, the input end of the program-controlled amplifier U5 is connected with the output end of the differential current signal or differential voltage signal of the standard device (22), the output end of the program-controlled amplifier U5 is connected with the second auxiliary contact of the relay J3, and the third auxiliary contact of the relay J3 is connected with the input end of the amplitude processing module (212) of the standard device;

The program-controlled amplifier U1 is used for amplifying or reducing the working current signal or the working voltage signal output by the standard device (22) to a first design threshold value;

the programmable amplifier U5 is used for amplifying or reducing the difference working current signal or the difference voltage signal output by the standard device (22) to a second design threshold value.

4. A remote calibration system for a mutual inductor calibration instrument according to claim 3, wherein the whole detection tracing device (21) further comprises a standard device phase processing module (216), an input end of the standard device phase processing module (216) is connected to an output end of the ac signal conditioning module (211), and an output end of the standard device phase processing module (216) is connected to an input end of the control module (215);

the standard device phase processing module (216) is used for measuring the phase of the working and difference alternating current vector signals and transmitting a phase value to the control module (215) for operation processing, and the control module (215) transmits a phase measurement result to the intelligent terminal (300) so that the intelligent terminal (300) synchronously transmits the phase measurement result to the remote server (1);

the control module (215) is configured to receive the phase value, determine, according to the phase value, whether the phase value output by the standard device (22) meets a standard, obtain a third determination result, and synchronously transmit the third determination result to the intelligent terminal (300).

5. The transformer verification instrument remote calibration system of claim 4, wherein the standard device phase processing module (216) comprises 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 phase-locked loop Φ8, a third frequency divider Φ7, and an and gate Φ2;

the input end of the second zero-crossing detection sub-module phi 4 is connected to the output end of the program-controlled amplifier U5, the output end of the second zero-crossing detection sub-module phi 4 is connected to the input end of the second frequency divider phi 3, the output end of the second frequency divider phi 3 is connected to the second input end of the NAND gate phi 1, the output end of the NAND gate phi 1 is connected to the second input end of the AND gate phi 2, and the output end of the AND gate phi 2 is connected to the input end of the control module (215).

6. A method for remote calibration of a transformer verification instrument applied to a remote calibration system of a transformer verification instrument as claimed in any one of claims 1 to 5, said method comprising:

the standard device (22) responds to a starting tracing command sent by the intelligent terminal (300), is disconnected from the instrument to be detected (23) and is connected with the whole detecting tracing device (21), and alternating current signals are generated and transmitted to the alternating current signal conditioning module (211);

the alternating current signal conditioning module (211) receives the alternating current signal, amplifies or reduces the alternating current signal to obtain an amplified or reduced alternating current signal, and transmits the amplified or reduced alternating current signal 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-checking before obtaining the amplified or reduced alternating current signal, obtains a satellite time-frequency signal under a reference clock provided by the satellite time service module (213) and a standard voltage signal provided by the standard battery (214), and converts the satellite time-frequency signal and the standard voltage signal into a first frequency signal and transmits the first frequency signal to the control module (215), wherein the first frequency signal comprises the standard voltage frequency signal converted by the standard voltage signal;

The control module (215) judges whether the standard device amplitude processing module (212) is qualified in self-checking according to the satellite time-frequency signal and the first frequency signal, a first judgment result is obtained, and the first judgment result is transmitted to the intelligent terminal (300), so that the intelligent 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) is qualified in self-inspection, the standard device amplitude processing module (212) is switched to a standard device (22) tracing circuit, receives the amplified or reduced alternating current signal, performs frequency conversion on the amplified or reduced alternating current signal, obtains a second frequency signal after acquiring a satellite time-frequency signal and a gate U4 phase under a reference clock with the satellite time service module (213), and inputs 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) accords with a standard according to the received second frequency signal and the satellite time-frequency signal to obtain a second judgment result, and transmits the second judgment result to the intelligent terminal (300) so that the intelligent terminal (300) synchronously transmits the second judgment result to the remote server (1);

The standard device phase processing module (216) measures a phase value of the alternating current signal and inputs the phase value into the control module (215);

the control module (215) receives the phase value, judges whether the phase value output by 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) judges whether the amplitude and the phase of the standard device (22) accord with the standard according to the received second judging result and the third judging result;

after the amplitude and the phase of the standard device (22) meet the standards, the intelligent terminal (300) controls the standard device (22) to be electrically connected with the to-be-detected instrument (23), meanwhile, the connection with the whole detection tracing device (21) is disconnected, and the standard device (22) is utilized to detect or calibrate the to-be-detected instrument (23).

7. The method according to claim 6, characterized in that after verification or calibration of the instrument (23) to be examined with the standard device (22), the method further comprises:

Acquiring a photographed video image of an instrument to be inspected (23);

performing feature extraction based on deep learning on the shot video based on a preset feature model to obtain accurate indication information of an instrument to be detected (23);

generating a certification certificate or a calibration report of the instrument to be inspected (23) based on the indication information and the electric signal data output by the standard device (22);

and generating and storing a to-be-inspected instrument file of the to-be-inspected instrument (23) based on the verification certificate or the calibration report and a result notice.

8. An intelligent terminal, comprising a processor, wherein the processor is coupled with a memory;

the processor is configured to execute a computer program stored in the memory to cause the intelligent terminal to perform the method according to claim 6 or 7.