CN115656910A - Remote calibration system, method and equipment for mutual inductor calibration instrument - Google Patents

Abstract

The application relates to a remote calibration system, a method and equipment for a mutual inductor calibration instrument, which relate to the technical field of mutual inductor calibration instruments in electric energy metering devices and comprise a remote server and a field calibration subsystem, wherein the remote server is in network connection with the field calibration subsystem; the field calibration subsystem comprises a whole inspection traceability device, a standard device, a camera and an intelligent terminal, wherein the whole inspection traceability device is respectively connected with the intelligent terminal and the standard device, and the standard device is electrically connected with the instrument to be detected; the remote server is used for monitoring at least one field calibration subsystem; the whole inspection traceability device is used for traceability of the standard device, self-inspection and transmission of a calibration result to the intelligent terminal and the remote server; the intelligent terminal is used for transmitting tracing, self-checking and/or verification calibration commands and receiving detection data information; the camera is used for realizing on-line monitoring. This application has anytime and anywhere and calibrates standard device and wait to examine the instrument for the effect of quantity value traceability and transmission.

Description

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

Technical Field

The application relates to the technical field of mutual inductor calibration instruments, in particular to a system, a method and equipment for remotely calibrating a mutual inductor calibration instrument.

Background

The electric energy metering device comprises a mutual inductor and secondary loop equipment thereof, various electric energy meters and acquisition and control terminals thereof, the mutual inductor checking instrument refers to a mutual inductor and checking equipment of a secondary loop thereof and comprises a mutual inductor checking instrument, a secondary loop voltage drop and load tester, a mutual inductor load box calibrator, a mutual inductor transformation ratio tester and the like, and the whole transformer checking instrument calibrating device is standard device equipment for calibrating and calibrating the mutual inductor checking instrument. Each transformer checking instrument and standard device equipment need to be regularly checked, calibrated and traced every year, and the transformer checking instrument is applied to detection of a transformer and a secondary circuit thereof in a power grid electric energy metering device, so that the transformer and the secondary circuit thereof can meet power grid specifications.

In the process of transferring relevant quantity values, a mutual inductor checking instrument needs to regularly send other standard equipment such as the mutual inductor checking instrument to a higher-level checking mechanism for checking and calibrating before checking and detecting a mutual inductor and a secondary circuit of the mutual inductor, the regulation specifies that the checking and calibrating period of the mutual inductor checking instrument is one year, before checking and calibrating the mutual inductor checking instrument, a standard device of the mutual inductor checking instrument needs to be sent to a higher-level or qualified third-party detecting mechanism for calibrating, a standard device of the mutual inductor checking instrument is a whole checking device of the mutual inductor checking instrument, and after the quantity value tracing is completed, the mutual inductor and the secondary circuit of the mutual inductor are checked and detected.

On the one hand, when equipment such as a mutual inductor calibration instrument and a standard device thereof is sent to an upper-level calibration mechanism laboratory for calibration and calibration, the instrument is often bumpy and loaded and unloaded brutal in the transportation process, so that the instrument damage probability is increased, the quantity value is not timely transferred or even the metering is out of alignment, and when the mutual inductor calibration instrument and the standard device thereof are calibrated and calibrated, a professional calibrator is required to operate, the equipment is often queued for waiting, and the time, the labor and the efficiency are low.

On the other hand, when equipment such as a mutual inductor calibration instrument and a standard device thereof is calibrated, the calibration is performed in a laboratory environment, national metrological calibration regulations have higher requirements on a laboratory, and the field calibration is not in the same environmental state and is not in the same time period, so that additional influence on error precision possibly causes inaccurate calibration results and influences use.

On the other hand, as the transformer checking instrument has no related national or industrial communication protocol, only the enterprise standard Q/GDW1987-2013 of the national grid company is published, but the communication protocol of the transformer checking instrument of other manufacturers is not published, technical parameters and test readings of the instrument to be checked are mostly manually input through human eye identification at present, or the manufacturer of the instrument to be checked is required to provide the communication protocol, or the communication protocol of the instrument to be checked is decoded, but the method can touch related laws, the detection efficiency is influenced, the authenticity of data in the detection process cannot be confirmed, and the quantity value tracing and the transmission efficiency are reduced.

Disclosure of Invention

In order to calibrate and examine standard device and the instrument of examining and examining anytime and anywhere, improve detection efficiency, accurate calibration and verification result for quantity value traceability and transmission efficiency, this application provides a long-range calibration system of mutual-inductor check-up instrument, method and equipment.

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

the remote calibration system for the mutual inductor 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 field calibration subsystem comprises a whole inspection traceability device, a standard device, a camera and an intelligent terminal, wherein the whole inspection 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 carrying out online real-time supervision and monitoring on the at least one field calibration subsystem;

the whole inspection and source tracing device is used for realizing self-inspection and source tracing of the standard device;

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

the intelligent terminal is used for transmitting a verification calibration command and/or a self-checking traceability command and receiving a detection result transmitted by the whole-checking traceability device, the standard device, the camera and the instrument to be detected;

the camera is used for carrying out online monitoring shooting on the technical parameters and the display indicating number of the to-be-detected instrument to obtain a shot video image, carrying out image AI (artificial intelligence) 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 instrument to be detected is remotely verified or calibrated, firstly, the intelligent terminal transmits a calibration command, a tracing command or a self-inspection command to the whole inspection tracing device, the whole inspection tracing device performs self-inspection or calibration according to the received calibration command or self-inspection command, firstly, the whole inspection tracing device realizes self-inspection according to the received self-inspection command, and executes a standard device tracing command after the self-inspection is qualified, the instrument to be detected is verified or calibrated according to the calibration command after the tracing meets the standard, and in the process of verifying or calibrating the instrument to be detected and the self-inspection tracing device self-inspection or tracing, the intelligent terminal transmits the self-inspection tracing result or the verification result to the remote server, so that the remote server performs whole-flow supervision and monitoring on the field calibration subsystem, and the standard device and the whole inspection tracing device are placed in the field calibration subsystem, so that the standard device and the instrument to be detected can be verified or calibrated at any time and any place, the detection efficiency, the calibration result is accurate, and the magnitude tracing and the transfer efficiency is accelerated.

Optionally, the whole inspection and source tracing device includes 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 time service 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 source tracing starting command transmitted by the intelligent terminal, disconnecting the instrument to be detected and connecting the whole source 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 reducing the alternating current signal to obtain an amplified or reduced alternating current signal, and transmitting the amplified or reduced 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 a first frequency signal converted from the satellite time-frequency signal and the standard voltage signal to the control module, wherein the first frequency signal comprises a standard voltage frequency signal converted from 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 far-end server;

when the standard device amplitude processing module is qualified through self-inspection, the standard device amplitude processing module is further 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, obtaining a satellite time-frequency signal under a reference clock obtained by the satellite time service module, performing AND-AND operation on the satellite time-frequency signal through the standard device amplitude processing module to obtain 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 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 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 a 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 electrically connected with the digital signal input end of the control module and the input end of the V/F voltage frequency converter U3 respectively, 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 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 RMS-DC true effective value converter U2 and the V/F voltage frequency converter U3 to be conducted when a standard device is calibrated, or controlling the standard battery and the V/F voltage frequency converter U3 to be conducted when self-checking is carried out;

the V/F voltage frequency converter U3 is used for converting the digital signal or the standard voltage signal of the standard battery into a pulse signal and transmitting the pulse signal to the AND gate U4;

the AND gate U4 is used for performing AND operation on the pulse signal and the time-frequency signal to obtain a first frequency signal of the amplified or reduced alternating current signal under a reference clock, and transmitting 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 or not 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 difference current signal and a difference voltage signal, and the alternating current signal conditioning module includes a program control amplifier U1, a program control amplifier U5 and a relay J3; the input end of the program-controlled amplifier U1 is connected to the working current or working 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, 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, the output end 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 the input end of the standard device amplitude processing module;

the program-controlled amplifier U1 is used for amplifying or reducing a working current signal or a 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 and source tracing device further includes a standard device phase processing module, an input end of the standard device phase processing module is connected to an output end of the alternating current signal conditioning module, and an output end of the standard device phase processing module is connected to an input end of the control module;

the standard device phase processing module is used for measuring the phases of working and differential alternating current vector signals and transmitting the 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 output phase value of 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 submodule Φ 6, a second zero-crossing detection submodule Φ 4, a first frequency divider Φ 5, a second frequency divider Φ 3, a nand gate Φ 1, a phase-locked loop Φ 8, a third frequency divider Φ 7, and an and gate Φ 2;

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

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

In a second aspect, the present application provides a method for remotely calibrating a transformer calibration instrument, which adopts the following technical scheme:

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

the standard device responds to a source starting command sent by the intelligent terminal, disconnects the instrument to be detected and is connected with the whole detection source tracing device, and generates and transmits an alternating current signal to the 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 obtaining the amplified or reduced alternating current signal, 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 transmits a first frequency signal converted from the satellite time-frequency signal and the standard voltage signal to the control module, wherein the first frequency signal comprises a standard voltage frequency signal converted from the standard voltage signal;

the control module judges whether the amplitude processing module of the standard device is qualified in self-check 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 through 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, carry out frequency conversion on the amplified or reduced alternating current signal, acquire a time-frequency satellite signal under a reference clock by the satellite time service module, obtain a second frequency signal after the time-frequency satellite signal passes through an AND gate of the standard device amplitude processing module, and input 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 or not 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 a 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 output phase value of the standard device meets the standard or not according to the phase value to obtain 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 meet the standard or not according to the received second judgment result and the third judgment result;

work as after the amplitude and the phase place of standard device all accord with the standard, intelligent terminal control standard device with wait to examine the instrument electricity and connect, break off simultaneously and examine the connection of tracing to the source device with whole, utilize standard device is right wait to examine the instrument and examine examination or calibration.

Optionally, after the calibrating or calibrating of the apparatus to be tested is performed by using the standard apparatus, the method further includes:

acquiring a shot 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 indicating number information of the instrument to be detected;

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

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

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

an intelligent terminal comprising a processor, the processor coupled with a memory;

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

Drawings

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

Fig. 2 is a schematic circuit diagram of an integrated trace source device according to an embodiment of the present application.

Fig. 3 is a schematic flowchart of a method for remotely calibrating 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.

Description of reference numerals: 1. a remote server; 2. a field calibration subsystem; 21. a whole inspection 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 (4) an intelligent terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-4 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The embodiment of the application discloses a remote calibration system for a mutual inductor calibration instrument. Referring to fig. 1, the remote calibration system for 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 field calibration subsystem 2 comprises a whole inspection tracing device 21, a standard device 22, a camera 24 and an intelligent terminal 300, wherein the whole inspection tracing 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 calibrated 23;

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

the whole inspection traceability device 21 is used for realizing self-inspection and traceability of the standard device 22, transmitting self-inspection and/or traceability results to the intelligent terminal 300, and synchronously transmitting the self-inspection 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 23 to be tested to obtain a calibration and calibration result, transmitting the calibration and calibration result to the intelligent terminal 300, and synchronously transmitting the calibration and calibration result to the remote server 1 through the intelligent terminal 300;

the intelligent terminal 300 is configured to transmit a verification calibration command and/or a self-inspection traceability command, and receive detection data information transmitted by the whole inspection traceability device 21, the standard device 22, the camera 24, and the to-be-inspected instrument 23.

The detection data information comprises a verification calibration result and a self-checking tracing result; the instrument to be detected can be a mutual inductor calibrator, a secondary voltage drop load tester, a mutual inductor load box calibrator, a mutual inductor transformation ratio tester and the like.

In this embodiment, one remote server 1 can be connected to a plurality of field calibration subsystems 2, and simultaneously monitors and monitors the detection processes of the plurality of field calibration subsystems 2 on line in real time through the internet. When the instrument 23 to be inspected is verified or calibrated in the field calibration subsystem 2, the intelligent terminal 300 firstly controls the whole inspection traceability device 21 to realize self-inspection, when the whole inspection traceability device 21 is qualified in self-inspection, the whole inspection traceability device 21 is used for tracing the standard device 22, and the whole inspection traceability device 21 can be used for verifying or calibrating the instrument 23 to be inspected only when the traceability of the standard device 22 meets the standard.

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

In this embodiment, the verification or calibration result includes a certificate of verification and a calibration report, and a notice of the result is issued for the apparatus to be inspected that is not qualified in verification.

As an optional implementation manner of this embodiment, the entire inspection and tracing apparatus 21 includes an alternating current signal conditioning module 211, a standard apparatus 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 time service 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 instrument 23 to be checked and connecting the instrument 21 to be checked and the whole checking and tracing 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 electrical signal, obtain a satellite time-frequency signal provided by the satellite time service module 213 under the reference clock and a standard voltage signal provided by the standard battery 214, and transmit a first frequency signal converted from the satellite time-frequency signal and the standard voltage signal under the reference clock 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 apparatus amplitude processing module 212 is qualified by self-checking according to the satellite time-frequency signal and the first frequency signal in 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;

when the standard device amplitude processing module 212 is qualified by self-checking, 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, and obtain a second frequency signal after the satellite time-frequency signal under the reference clock obtained by the satellite time service module 213 passes through an and gate of the standard device amplitude processing module 212, 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 instrument 23 to be inspected is verified or calibrated, the standard device 22 needs to be traced to ensure the accuracy of verification or calibration of the instrument 23 to be inspected.

When the standard device 22 traces the source, firstly, a tracing command is responded, the connection with the instrument 23 to be detected is disconnected, the whole tracing device 21 is connected, a tracing program of the standard device 22 is started, the standard device 22 transmits an alternating current signal into the alternating current signal conditioning module 211, after the alternating current signal is amplified or reduced by the alternating current signal conditioning module 211, the amplified or reduced alternating current signal is transmitted to the standard device amplitude processing module 212, wherein the alternating current signal comprises a working voltage signal, a working current signal, a difference current signal and a difference 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 a reference clock and a satellite time-frequency signal under the reference clock of the satellite time-frequency module 213, and the standard device amplitude processing module 212 is self-checked to determine whether the standard device amplitude processing module 212 is qualified, so as to obtain a first determination result, after the standard device amplitude processing module 212 is qualified, the standard device amplitude processing module 212 is used to trace the standard device 22, 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 processed by the standard device amplitude processing module 212 and the satellite time-frequency module 213 in a matching manner and are transmitted to the control module 215, the control module 215 determines whether the standard device 22 meets the standard according to the received processed dc voltage signal and the satellite time-frequency signal, so as to obtain a second determination result, and then the control module 215 synchronously transmits the first determination result and the second determination result to the intelligent terminal 300 and synchronously transmits the remote intelligent server 1 through the intelligent terminal 300 to synchronously archive the remote intelligent server.

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 conforms to the standard and that the standard device 22 does not conform to the standard.

In this embodiment, the selectable model of the standard device 22 is the integral calibration device of the digital voltage-dividing type mutual inductor calibrator of the granted utility model patent ZL201620305227.1, and the selectable model of the satellite time service module 213 is any one or combination of a GPS satellite time service module, a beidou satellite time service module, a glonass satellite time service module and a galileo satellite time service module; an alternative model for the control module 215 is an MCU microprocessor of STM32F103C8T 6.

As an optional implementation manner 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 alternating current 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, the second auxiliary contact of the relay J4 is electrically connected with the standard battery 214, the 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 a V/F voltage frequency converter U3;

the relay J4 is used for controlling the RMS-DC true effective value converter U2 and the V/F voltage frequency converter U3 to be conducted when the standard device 22 is calibrated, or controlling the standard battery 214 and the V/F voltage frequency converter U3 to be conducted when self-test is carried out;

the V/F voltage frequency converter U3 is used for converting the digital signal into a pulse signal and transmitting the pulse signal into the AND gate U4;

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

When the standard device amplitude processing module 212 is subjected to self-test, the control module 215 controls the relay J4 to enable the standard battery 214 and the V/F voltage frequency converter U3 to be connected, 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, the pulse signal is transmitted into the and gate U4, 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 performs phase-and on the pulse signal and the satellite time-frequency signal to obtain a first frequency signal of the standard battery 214 under the reference clock, 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 or not according to the first frequency signal and the preset frequency signal converted by the standard battery 214 under the reference clock through the V/F voltage frequency converter U3.

For example, when the reference clock of the satellite is selected to be 1 second, the second conversion frequency is 10kHz, and at this time, the standard battery 214 is selected from the standard battery 214 of 0.01 level, 1V, and the like, the voltage output by the standard battery 214 is 1V, and when the frequency of the 1V standard voltage converted into 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, the V/F voltage frequency converter U3 needs to be maintained or replaced, and the standard device 22 can be traced after the first conversion frequency is qualified by self-inspection again.

As an optional implementation manner of this embodiment, the ac signal conditioning module 211 includes a programmable amplifier U1 for amplifying or reducing the operating current or operating voltage signal, a resistor R0 for conditioning the variable ratio of the primary current 1A and 5A of the operating current signal and electromagnetically converting the primary current into a current transformer CT with a fixed secondary current of 20mA and a transfer voltage signal, a resistor R1, a resistor R2, and a resistor R6 for dividing the operating voltage, a programmable amplifier U5 for amplifying a differential current or differential voltage signal, 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 operating voltage signals, a relay J2 for switching the differential current and differential voltage signals, a relay J5 for switching the voltage levels of the operating voltages 100V/√ 3 and 100V, a relay J6 for switching the differential current signals of the current levels of the operating currents 1A and 5A, and a relay J7 for switching the differential voltage signals of the voltage levels of the operating voltages 100V/√3and 100V, wherein the resistors are precise resistors.

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 in parallel with the resistor R0, wherein one end of the secondary side is grounded, and the other end is connected to the first auxiliary contact of the relay J1; a first auxiliary contact of the relay J5 is connected to a first working voltage signal output end of the standard device 22, a 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 a second working voltage signal output end of the standard device 22 and the ground, and a 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 control amplifier U1, wherein the resistors in this embodiment are precision resistors.

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

When tracing the standard device 22, the standard device 22 outputs different types of ac signals, and then sets a determination point according to the specification of "JJG 169 transformer calibrator", and transmits the ac signals after amplification or reduction processing to the standard device amplitude processing module 212, 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%, 120%, the current transformer CT conditioning current signal passing through 1A-or-5A/20mA is 0.0002A, 0.001A, 0.004A, 0.02A, 0.024A, the rotation voltage signal is 0.01V, 0.05V, 0.2V, 1V, 1.2V, and the amplification factor of the signal to be detected is × 100, × 20, × 5, × 1, and × 1, respectively. The working current signal comprises other working current signals such as 0.5A and the like besides 5A or 1A;

according to the verification procedure of the voltage transformer, when the working voltage signal to be detected is 100V/V3 or 100V, the calibration points are 20%, 50%, 80%, 100% and 120%, the conditioning voltage signal is 0.2V, 0.5V, 0.8V, 1V and 1.2V, and the amplification factor of the signal to be detected is x 5, x 2, x 1.25, x 1 and x 1. The operating voltage signal includes other operating voltage signals such as 150V and 220V in addition to 100V/√ 3 or 100V;

according to the calibration rule of the current transformer, a differential current signal to be detected does not exceed 10% of a rated working current 1A or 5A generally, the maximum differential current signal is 0.1A or 0.5A, the calibration points are 1%, 5%, 20%, 100% and 120%, conditioning voltage signals are 0.01V, 0.05V, 0.2V, 1V and 1.2V, and the amplification factors of the signal 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 does not exceed the current of 100V/√ 3 or 10% of 100V, namely 5.7737V or 10V, the calibration points are 20%, 50%, 80%, 100% and 120%, the conditioning voltage signal is 0.2V, 0.5V, 0.8V, 1V and 1.2V, and the amplification factors of the signal to be detected are multiplied by 50, multiplied by 20, multiplied by 12.5, multiplied by 10 and multiplied by 10 respectively.

In order to make the ac vector signal of the standard device 22 true and accurate, the whole inspection tracing apparatus 21 further includes a standard device phase processing module 216, an 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 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 configured to measure the phase value of the working sum difference ac vector signal and transmit the phase value to the control module 215;

the control module 215 is configured to receive the phase value, determine whether the phase value output by the standard device 22 meets the standard according to the phase value, 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 electrical signal output by the standard device 22, it is necessary to determine the phase of the ac electrical signal after the amplification or reduction process, and further determine the accuracy of the standard device 22 by means of ac vector signal processing.

As an optional implementation manner of this embodiment, the standard device phase processing module 216 includes a first zero-cross detection submodule Φ 6, a second zero-cross detection submodule Φ 4, a first frequency divider Φ 5, a second frequency divider Φ 3, a nand gate Φ 1, a phase-locked loop Φ 8, a third frequency divider Φ 7, and an and gate Φ 2;

the input end of a 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 a first frequency divider phi 5 and the input end of a phase-locked loop phi 8, the output end of the first frequency divider phi 5 is connected with the first input end of a NAND gate phi 1, the output end of the phase-locked loop phi 8 is connected with the first input end of an AND gate phi 2, the input end of a 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 submodule Φ 4 is connected to the output end of the program-controlled amplifier U5, the output end of the second zero-crossing detection submodule Φ 4 is connected to the input end of the second frequency divider Φ 3, the output end of the second frequency divider Φ 3 is connected to the second input end of the nand gate Φ 1, the output end of the nand gate Φ 1 is connected to the second input end of the and gate Φ 2, and the output end of the and gate Φ 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 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 an ac working voltage, an ac working current, a differential working voltage, or a differential working current to a design threshold of 1V (calibration point 100%), and simultaneously transmits the ac working voltage or the differential working voltage to the first zero-cross detection submodule Φ 6 and the second zero-cross detection submodule Φ 4, the ac working voltage or the differential working voltage is transmitted to the first zero-cross detection submodule Φ 6, the ac working current or the differential working current is transmitted to the second zero-cross detection submodule Φ 4, the first zero-cross detection submodule Φ 6 and the second zero-cross detection submodule Φ 4 convert a 50Hz ac signal into a 50Hz positive pulse signal, and then the first frequency divider Φ 5 and the second frequency divider Φ 3 convert the positive pulse signal of the ac working signal and the differential working signal from 50Hz to 0.5Hz, and obtain a phase difference through the nand gate Φ 1; the zero-crossing pulse signal of the alternating working voltage or the alternating working current is simultaneously input into the phase-locked loop phi 8 and the third frequency divider phi 7 to multiply the frequency of the 50Hz power frequency signal into 1080000Hz, the phase value of the NAND gate phi 1 and the phase value of 1080000Hz generate phase pulse signals through the AND gate phi 2 simultaneously, the phase pulse signals are transmitted to the counter of the control module 215 to be counted, the phase measurement is completed, and the phase measurement data are obtained.

The method includes that 50Hz is counted by 1080000Hz pulses, namely, each 1 pulse is equal to 1', the phase is expanded by 100 times due to the fact that the 50Hz frequency is divided by 100 times, namely, the value corresponding to each pulse is 0.01', the value corresponding to 50000 pulses is 500', the control module 215 judges whether the phase of the standard device 22 meets the standard or not according to the received phase measurement data range to obtain a third judgment result, and the third judgment result comprises that the standard device 22 meets the standard or that the standard device 22 does not meet the standard.

The standard device 22 is qualified only if the amplitude and phase of the standard device 22 are determined to be qualified by the standard device amplitude processing module 212 and the standard device phase processing module 216.

When the proof mass processing module 212 and the proof mass 22 complete the self-test and the trace-to-source sequentially and the proof mass phase processing module 216 measures the phase accurately, the proof mass 22 can verify or calibrate the instrument 23.

After the self-checking and the tracing of the whole inspection tracing device 21 are completed, the intelligent terminal 300 starts the calibration or calibration program of the standard device 22, at this time, the standard device 22 is controlled to be disconnected from the whole inspection tracing device 21 and switched to be connected to the instrument 23 to be tested, and the calibration or calibration of the instrument 23 to be tested is started.

In this embodiment, since the communication protocol of the to-be-detected instrument 23 of another manufacturer is not public, and there is no communication protocol established by the country and industry for the instrument transformer checking instrument, the remote verification and calibration process needs to be monitored and monitored online in real time by using the camera 24.

The camera 24 is configured to perform online monitoring on technical parameters and display values of the instrument 23 to be detected to obtain a shot video image, perform image AI autonomous identification on the shot video image to obtain an identification result, transmit the identification result to the intelligent terminal 300, and synchronously transmit the identification 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, identification and confirmation, then the obtained shot video image is converted into indicating value data of the instrument 23 to be detected, the identification rate is improved, the indicating value data is transmitted to the intelligent terminal 300, the obtained indicating value data is synchronously transmitted to the remote server 1 through the Internet to be monitored in an online real-time supervision mode, the obtained indicating value data is converted into error data, and therefore the instrument to be detected can be conveniently detected or calibrated.

In this embodiment, it should be noted that the image AI autonomous recognition in the present application adopts the prior art, as long as the functions of automatic light supplement, autonomous zooming and autonomous recognition can be realized, so that the present application is not explained or specifically limited.

After the indicating value data of the instrument 23 to be detected is obtained, the intelligent terminal 300 can judge the accuracy of the instrument 23 to be detected according to the indicating value data of the instrument 23 to be detected, so as to issue a verification certificate or a calibration report according to the accuracy meeting the standard, and issue a result notice if the verification certificate or the calibration report does not meet the standard.

The implementation principle of the remote calibration system for the mutual inductor calibration instrument provided by the embodiment of the application is as follows: before calibrating an instrument 23 to be detected, self-detection needs to be performed on the entire detection traceability device 21, in the process of performing self-detection on the entire detection traceability device 21, firstly, the relay J4 is controlled to enable the standard battery 214 and the V/F voltage frequency converter U3 to be conducted, so that the standard voltage output by the standard battery 214 is input to the and gate U4, meanwhile, the satellite time-frequency signal under the reference clock acquired by the satellite time service module 213 is transmitted to the and gate U4, after the and gate U4 performs the phase-subtraction, the first frequency signal under the reference clock converted by the V/F voltage frequency converter U3 is obtained, the first conversion frequency is input into the control module 215, the control module 215 judges whether the V/F voltage frequency converter U3 is qualified or not according to the received first frequency signal under the reference clock and the satellite time-frequency signal, and when the error of the first frequency signal relative to the satellite time-frequency signal is within the precision 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 precision range of the V/F voltage-frequency converter U3, the control module 215 judges that the V/F voltage-frequency converter U3 is unqualified, and generates an alarm signal for operation and replacement.

After the V/F voltage-frequency converter U3 is judged to be qualified, the standard device 22 is controlled to disconnect from the instrument 23 to be tested, 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 by the corresponding program control amplifier U1 and the program control 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, so that the standard device amplitude processing module 212 judges the amplitude of the alternating current signal to obtain a second judgment result, the standard device phase processing module 216 judges the phase difference of the alternating current signal to obtain a third judgment result, the control module 215 transmits the second judgment result and the third judgment result to the intelligent terminal 300 and synchronously transmits the second judgment result and the third judgment 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 or not according to the second judgment result and the third judgment result.

When the second judgment result and the third judgment result both meet the standard, the standard device 22 can be judged to meet 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 device 22 is determined to meet the standard, the standard device 22 is controlled to disconnect from the whole inspection and tracing device 21 and switch to connect with the instrument to be inspected 23, and the instrument to be inspected 23 is inspected or calibrated.

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

in step S101, the standard device 22 responds to the start tracing command sent by the intelligent terminal 300, disconnects the instrument 23 to be detected and connects with the whole tracing device 21, 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 electrical signal, obtains 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 transmits a first frequency signal converted from the satellite time-frequency signal and the standard voltage signal to the control module 215, where the first frequency signal includes a standard voltage frequency signal converted from the standard voltage signal.

In step S104, the control module 215 determines whether the standard apparatus amplitude processing module 212 is qualified by self-check according to the satellite time-frequency signal and the first frequency signal to obtain 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.

Step S105, when the first determination result is that the standard device amplitude processing module 212 is qualified by self-inspection, the standard device amplitude processing module 212 switches to the tracing circuit of the standard device 22, receives the amplified or reduced ac signal, performs frequency conversion on the amplified or reduced ac signal, obtains a second frequency signal after performing phase comparison with the satellite time-frequency signal and the gate U4 under the reference clock obtained by 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 the satellite time-frequency signal, 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 smart 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.

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 instrument 23 to be tested, and simultaneously disconnects the whole inspection and tracing device 21, and the standard device 22 is used to perform verification or calibration on the instrument 23 to be tested.

In this embodiment, after the calibrating or calibrating of the apparatus 23 to be tested by the standard device 22, the method further comprises: acquiring a shooting video image of the instrument 23 to be detected; performing feature extraction based on deep learning on the shot video based on a preset feature model to obtain accurate registration information of the instrument 23 to be detected; generating a certificate of verification or a calibration report and a result notice of the instrument to be tested 23 based on the registration information and the electrical signal data output by the standard device 22; and generating an instrument file to be tested of the instrument to be tested 23 based on the certificate of verification or the calibration report, and storing the file.

In this embodiment, in order to increase the authenticity 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 on the instrument 23 to be detected, the shooting device is used to perform online monitoring shooting on the indication value of the instrument 23 to be detected, so as to obtain a shooting video, the preset feature model is used to perform feature extraction on the indication value in the shooting video, so as 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; wherein, the archive of the instrument to be inspected includes the shooting video and the basic information of the instrument to be inspected 23, the basic information of the instrument to be inspected 23 includes the name, the number and the unit to which the instrument to be inspected 23 belongs, and the characteristic information includes the first conversion frequency and the second conversion frequency.

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

After obtaining the certification certificate or the calibration report and the result notice, it needs to be stored in the intelligent terminal 300 for the subsequent tracking of the instrument 23 to be tested and the knowledge of the history.

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

In this embodiment, after the calibration of the to-be-detected instrument 23, the calibration process of the to-be-detected instrument 23 is stored, so that the possibility of loss is reduced, a digital twin model needs to be established according to real-time data acquisition information in the calibration or calibration process, and a calibration or calibration process file is generated according to the simulation process of the digital twin model.

Meanwhile, an information database is established in the remote server 1, and the file of the instrument to be detected of each instrument to be detected 23 is stored in the information database, so that the verification or calibration process of the instrument to be detected 23 can be reserved, and the archiving and the query can be conveniently carried out.

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

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 communications component 304, and a communications 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 transformer calibration instrument remote calibration method; the memory 302 is used to store various types of data to support operation at the smart terminal 300, which may include, for example, instructions for any application or method operating on the smart terminal 300, as well as application-related data. The Memory 302 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as one or more of Static Random Access Memory (SRAM), electrically Erasable Programmable Read-Only Memory (EEPROM), erasable Programmable Read-Only Memory (EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic or optical disk.

The I/O interface 303 provides an interface between the processor 301 and other interface modules, such as 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 (NFC), 2G, 3G, or 4G, or a combination of one or more of them, so that the corresponding Communication component 304 may include: wi-Fi part, bluetooth part, NFC part.

The intelligent terminal 300 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is configured to perform the transformer calibration apparatus remote calibration method according to the above embodiments.

The communication bus 305 may include a path to transfer information between the aforementioned components. The communication bus 305 may be a PCI (Peripheral Component Interconnect) bus, 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, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet), a PMP (portable multimedia player), a vehicle-mounted terminal (e.g., a car navigation terminal), etc., and a fixed terminal such as a digital TV, a desktop computer, etc., and may also be a server, etc.

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 above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application referred to in the present application is not limited to the embodiments with a particular combination of the above-mentioned features, but also encompasses other embodiments with any combination of the above-mentioned features or their equivalents without departing from the spirit of the application. For example, the above features may be replaced with (but not limited to) features having similar functions as those described in this application.

Claims (9)

1. The remote calibration system for the transformer checking 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) through a network; the field calibration subsystem (2) comprises a whole inspection and tracing device (21), a standard device (22), a camera (24) and an intelligent terminal (300), wherein the whole inspection and tracing device (21) is respectively connected to 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) to be detected or calibrated;

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

the whole inspection and source tracing device (21) is used for realizing self-inspection and source tracing of the standard device (22);

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

the intelligent terminal (300) is used for transmitting verification 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 detected (23);

the camera (24) is used for carrying out online monitoring shooting on technical parameters and display indicating values of the to-be-detected instrument (23), obtaining shot video images, carrying out image AI autonomous identification on the shot video images, obtaining identification results, and transmitting the identification results to the intelligent terminal (300), so that the intelligent terminal (300) transmits the identification results to the far-end server (1).

2. The transformer checking instrument remote calibration system according to claim 1, wherein the entire inspection 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 time service 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 source tracing starting command transmitted by the intelligent terminal (300), disconnecting the instrument to be detected (23) and connecting the whole source 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 configured to receive the alternating current signal, amplify or reduce the alternating current signal to obtain an amplified or reduced alternating current signal, and transmit the amplified or reduced 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 alternating current electrical signal, obtain a satellite time-frequency signal provided by the satellite time service module (213) under a reference clock and a standard voltage signal provided by the standard battery (214), and transmit a first frequency signal converted from the satellite time-frequency signal and the standard voltage 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 apparatus amplitude processing module (212) is qualified in self-inspection according to the satellite time-frequency signal and the first frequency signal to 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);

when 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 standard device (22) tracing circuit, receive the amplified or reduced alternating current signal, perform frequency conversion on the amplified or reduced alternating current signal, obtain a second frequency signal after a satellite time-frequency signal obtained by the satellite time service module (213) under a reference clock passes through an and gate of the standard device amplitude processing module (212), 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 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).

3. The transformer verification instrument remote calibration system according to claim 2, wherein the standard device amplitude processing module (212) comprises an RMS-DC true significance 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 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 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 respectively, 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 RMS-DC true effective value converter U2 and the V/F voltage frequency converter U3 to be conducted when tracing a standard device (22) or controlling the standard battery (214) and the V/F voltage frequency converter U3 to be conducted when performing self-test;

the V/F voltage frequency converter U3 is used for converting the digital signal or the standard voltage signal of the standard battery (214) into a pulse signal and transmitting the pulse signal into the AND gate U4;

the AND gate U4 is used for performing phase-and operation on the pulse signal and the satellite time-frequency signal to obtain a first frequency signal of the amplified or reduced alternating current signal under a reference clock, and transmitting 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 by self-inspection according to a first frequency signal of the standard battery (214).

4. The transformer checking instrument remote calibration system according to claim 2, wherein the alternating current signals comprise operating current signals, operating voltage signals, differential current signals and differential voltage signals, 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 to the working current or working voltage output end of the standard device (22), the output end of the program-controlled amplifier U1 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), the output end 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 the input end of the standard device amplitude processing module (212);

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

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 (22) to a second design threshold value.

5. The transformer checking instrument remote calibration system according to claim 4, wherein the whole inspection traceback 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 alternating current 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 phases of working and difference alternating current vector signals and transmitting the phase values to the control module (215) for operation processing, and the control module (215) transmits the phase measurement results to the intelligent terminal (300) so that the intelligent terminal (300) synchronously transmits the phase measurement results to the remote server (1);

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

6. The transformer checking instrument remote calibration system according to claim 5, wherein the standard device phase processing module (216) comprises a first zero-crossing detection submodule Φ 6, a second zero-crossing detection submodule Φ 4, a first frequency divider Φ 5, a second frequency divider Φ 3, a nand gate Φ 1, a phase-locked loop Φ 8, a third frequency divider Φ 7, and an and gate Φ 2;

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

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

7. A transformer verification instrument remote calibration method applied to the transformer verification instrument remote calibration system according to any one of claims 2 to 6, the method comprising:

the standard device (22) responds to a source tracing starting command sent by the intelligent terminal (300), disconnects the connection with the instrument to be detected (23) and connects with the whole source tracing device (21), and generates and transmits an alternating current signal to an 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 transmits a 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 comprises a standard voltage frequency signal converted from the standard voltage signal;

the control module (215) judges whether the standard device amplitude processing module (212) is qualified in self-inspection 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 (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 performing AND-AND with a satellite time-frequency signal AND-gate U4 under a reference clock obtained by 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) 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 (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, determines whether the phase value output by the standard device (22) meets a standard according to the phase value to obtain 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);

the intelligent terminal (300) judges whether the amplitude and the phase of the standard device (22) meet the standard or not according to the received second judgment result and the third judgment result;

work as after the amplitude and the phase place of standard device (22) all accord with the standard, intelligent terminal (300) control standard device (22) with examine instrument (23) electricity and connect, simultaneously the disconnection with the whole connection of examining source device (21) of tracing to, utilize standard device (22) is right examine instrument (23) and examine examination or calibration.

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

acquiring a shooting video image of an instrument (23) to be detected;

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

generating a certificate of verification or a calibration report and a result notice of the instrument to be detected (23) based on the indicating information and the electric signal data output by the standard device (22);

and generating an instrument file to be detected of the instrument to be detected (23) based on the verification certificate or the calibration report and the result notice, and storing the instrument file to be detected.

9. An intelligent terminal, comprising a processor coupled to a memory;

the processor is configured to execute the computer program stored in the memory to cause the smart terminal to perform the method of claim 7 or 8.

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