CN117092579A - Remote self-calibration method and system of voltage transformer based on satellite common view - Google Patents
Remote self-calibration method and system of voltage transformer based on satellite common view Download PDFInfo
- Publication number
- CN117092579A CN117092579A CN202311072741.6A CN202311072741A CN117092579A CN 117092579 A CN117092579 A CN 117092579A CN 202311072741 A CN202311072741 A CN 202311072741A CN 117092579 A CN117092579 A CN 117092579A
- Authority
- CN
- China
- Prior art keywords
- voltage
- transformer
- error
- calibrated
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 8
- 102100034112 Alkyldihydroxyacetonephosphate synthase, peroxisomal Human genes 0.000 claims description 6
- 101000799143 Homo sapiens Alkyldihydroxyacetonephosphate synthase, peroxisomal Proteins 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 230000005291 magnetic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G5/00—Setting, i.e. correcting or changing, the time-indication
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The application belongs to the field of electrical metering calibration, and discloses a remote self-calibration method and a system of a voltage transformer based on satellite common view, wherein the method comprises the following steps: laboratory end: the device comprises a calculator and a calibration end data acquisition unit connected with the calculator; the module to be calibrated comprises: the system comprises a voltage transformer, a singlechip, a voltage source error compensation submodule, a transformer error compensation submodule and a calibrated end data acquisition unit; the calibrated end data acquisition unit and the calibrated end data acquisition unit are connected with the satellite; the calibrated end data acquisition unit is also connected with a voltage transformer and a singlechip; the voltage source error compensation submodule is respectively connected with the voltage transformer and the singlechip; the mutual inductor error compensation submodule is connected with the voltage transformer and the singlechip respectively. According to the technical scheme, remote self-calibration can be realized without constructing detection equipment on site, and the influence of the calibration process on instruments and actual production is greatly reduced.
Description
Technical Field
The application belongs to the field of electrical metering calibration, and particularly relates to a remote self-calibration method and system of a voltage transformer based on satellite common view.
Background
The voltage transformer is voltage measurement equipment necessary in the precision high-voltage measurement fields such as a power system, a scientific test and the like, and as large-scale new energy is accessed into a power grid, the power grid needs stronger self-calibration capability, so that the deep research of a self-calibration method of the voltage transformer is urgent.
The voltage transformer is mainly divided into an electromagnetic voltage transformer and an electronic voltage transformer. The traditional electromagnetic voltage transformer has the advantages of being attractive in power system due to the limitation of the magnetic circuit saturation and the ferromagnetic resonance caused by the complex insulating structure, small in size, light in weight, low in cost, relatively simple in insulating structure, digitized in output, wide in dynamic range and widely applied to a transformer substation. However, due to the lack of experience technology, the transformer is required to detect the index after being put into use so as to solve the instability of the transformer in use.
Currently, error calibration of electronic voltage transformers is mainly divided into off-line detection and on-line detection. The off-line detection needs to be carried to the site for detection, a test loop needs to be built, the off-line detection needs to be carried out when the power of the transformer substation is cut off, the workload is huge, time and labor are wasted, and the efficiency is low. The emerging electronic voltage transformer has low stability and short period of calibration due to the fact that the emerging electronic voltage transformer comprises a large number of electronic devices, so that the offline detection becomes huge in task amount and consumes time and material resources and manpower.
Disclosure of Invention
The application aims to provide a remote self-calibration method and system for a voltage transformer based on satellite common view, which are used for solving the problems in the prior art.
In order to achieve the above object, the present application provides a remote self-calibration system of a voltage transformer based on satellite common view, comprising:
the system comprises a laboratory end and a module to be calibrated, wherein the module to be calibrated is connected with the laboratory end;
the laboratory end includes: the device comprises a calculator and a calibration end data acquisition unit connected with the calculator;
the module to be calibrated comprises: the system comprises a voltage transformer, a singlechip, a voltage source error compensation submodule, a transformer error compensation submodule and a calibrated end data acquisition unit; the calculator is in communication connection with the singlechip, and the calibrated end data acquisition unit are both connected with a satellite; the calibrated end data acquisition unit is also connected with the voltage transformer and the singlechip; the voltage source error compensation submodule is respectively connected with the voltage transformer and the singlechip; and the transformer error compensation submodule is respectively connected with the voltage transformer and the singlechip.
Optionally, the calibration end data acquisition unit comprises a laboratory standard voltage source, a first voltage-frequency converter, a first GPS common view receiver and a first counter which are sequentially connected; the first counter is also coupled to the calculator, and the first GPS receiver is also coupled to the satellite communication.
Optionally, the calibrated end data acquisition unit specifically includes: the system comprises a field voltage source, a second voltage-to-frequency converter, a second GPS common view receiver and a second counter; the field voltage source, the second voltage-frequency converter, the second GPS common view receiver and the second counter are connected in sequence; the second voltage-frequency converter is also connected with the voltage transformer; the second counter is also connected with the singlechip, and the second GPS common view receiver is also connected with the satellite in a communication way.
Optionally, the voltage source error compensation submodule specifically includes: the voltage source error signal acquisition module and the first compensation circuit module; one end of the voltage source error signal acquisition module is connected with the singlechip, the other end of the voltage source error signal acquisition module is connected with the first compensation circuit module, and the first compensation circuit module is also connected with the calibrated end data acquisition unit.
Optionally, the transformer error compensation submodule specifically includes: the transformer error signal acquisition module, the control operational amplifier and the second compensation circuit module;
the transformer error signal acquisition module, the control operational amplifier and the second compensation circuit module are sequentially connected, the transformer error signal acquisition module is used for acquiring a transformer error signal, and the second compensation circuit module is further connected with the voltage transformer.
In order to achieve the above object, the present application provides a remote self-calibration method of a voltage transformer based on satellite common view, including:
step one: a circuit switching instruction is sent to the singlechip through the computer to switch the circuit, so that the voltage transformer is switched from the working circuit to the measurement calibration circuit;
step two: obtaining output voltage of a laboratory standard voltage source and input voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter;
step three: the method comprises the steps that a first GPS common view receiver in a laboratory terminal and a second GPS common view receiver in a module to be calibrated simultaneously acquire the same satellite pulse signal, and the time of acquiring the same satellite pulse signal by each common view receiver is subjected to difference to obtain a first time difference of acquiring the same satellite pulse signal between the laboratory terminal and the module to be calibrated;
step four: acquiring an input end voltage error of the voltage transformer based on the first time difference and the corresponding frequency of each voltage; calibrating the input end voltage of the voltage transformer through a first voltage compensation circuit based on the input end voltage error;
step five: after the voltage of the input end of the voltage transformer is calibrated, the output voltage of the laboratory standard voltage source is adjusted, so that the output voltage of the laboratory standard voltage source is the voltage which should be output when the transformer has zero error;
step six: acquiring the output voltage of the laboratory standard voltage source after adjustment and the output voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter;
acquiring a second time difference of acquiring the same satellite pulse signal between the laboratory end and the module to be calibrated; acquiring an output end voltage error of the voltage transformer based on the second time difference and the corresponding frequency of each voltage;
step seven: and acquiring a high-voltage transformer error of the voltage transformer under high voltage based on the output end voltage error, and adjusting and calibrating the voltage transformer through a second voltage compensation circuit based on the high-voltage transformer error.
Optionally, a circuit switching instruction is sent to the singlechip through the computer to perform circuit switching, and the specific switching process comprises the following steps:
the program of the computer in the experimental end is initialized, the instruction receiving end is determined, after the determination, a circuit switching instruction is sent to the singlechip, the program in the singlechip is initialized, after the initialization, the determination of the circuit switching point is carried out, and after the circuit switching point is determined, the circuit switching is carried out.
Optionally, the specific calculation process for obtaining the first time difference and the second time difference includes:
Δt ABi ＝Δt AGPS -Δt BGPS ＝t A -t B
wherein t is A 、t B Clock time, delta t, of the laboratory end and the module to be calibrated respectively AGPS 、Δt BGPS The time difference delta t between atomic clock second pulse and GPS second pulse of the clocks of the laboratory end and the module to be calibrated ABi Is the time difference between the laboratory end and the module to be calibrated.
Optionally, the obtaining the input voltage error of the voltage transformer based on the first time difference and the corresponding frequency of each voltage specifically includes:
obtaining frequency difference data of the laboratory end and the module to be calibrated:
wherein f A 、f B The frequencies of the laboratory end and the module to be calibrated are respectively obtained by converting the voltage by a voltage-frequency converter; τ is the average time interval;
and reversely pushing the frequency difference data to obtain the voltage error of the input end.
Optionally, the high voltage transformer error of the voltage transformer under high voltage is obtained based on the output voltage error, and the specific calculation process includes:
ε＝ε k +ε f +ε c
＝-Y 0 Z 1 -Y′(Z 1 +Z 2 ′)±Y C Z D
wherein epsilon represents the error of the voltage transformer under low voltage k Indicating no-load error, epsilon f Representing load error, ε e Indicating leakage current error, Z 1 、Z 2 、Z D Equivalent impedance of primary coil, secondary coil and leakage current respectively, Y 0 、Y′、Y C The admittances of the excitation, load and primary leakage current, respectively.
The application has the technical effects that:
the application provides a remote self-calibration method and a system of a voltage transformer based on satellite common view, comprising the following steps: the system comprises a laboratory end and a module to be calibrated, wherein the module to be calibrated is connected with the laboratory end; the laboratory end includes: the device comprises a calculator and a calibration end data acquisition unit connected with the calculator; the module to be calibrated comprises: the system comprises a voltage transformer, a singlechip, a voltage source error compensation submodule, a transformer error compensation submodule and a calibrated end data acquisition unit; the calculator is in communication connection with the singlechip, and the calibrated end data acquisition unit are both connected with a satellite; the calibrated end data acquisition unit is also connected with the voltage transformer and the singlechip; the voltage source error compensation submodule is respectively connected with the voltage transformer and the singlechip; and the transformer error compensation submodule is respectively connected with the voltage transformer and the singlechip.
The application realizes the time-frequency conversion of the voltage magnitude by the voltage-frequency conversion module based on the principles of satellite common view method and low voltage calibration voltage transformer, and utilizes the time difference between the calibration end and the calibrated end, namely the error; the method is characterized in that data interaction between two places is realized by combining the Internet, input and output voltages of the voltage transformer are remotely calibrated through time and frequency, errors of the transformer under low voltage are calculated, errors of the transformer under high voltage are calculated through a correlation algorithm, and a circuit is designed to conduct error adjustment.
According to the application, by combining a remote calibration technology and through time-frequency remote transmission of GPS satellites, error detection of input and output voltages of a laboratory standard voltage and a calibration site voltage transformer is realized, an on-line detection method of the voltage transformer is combined with a satellite co-vision method, remote self calibration is realized without constructing detection equipment on site, the influence of a calibration process on instruments and actual production is greatly reduced, the calibration cost is reduced, the efficiency of calibration work is improved, and the intelligentization and automation level of the calibration process is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a block diagram of an embodiment of the present application;
FIG. 2 is a circuit switching flowchart in an embodiment of the application;
FIG. 3 is a diagram illustrating a voltage-to-frequency converter according to an embodiment of the present application;
fig. 4 is a flowchart of calibration of a voltage transformer according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments of the application will now be described in detail, which should not be considered as limiting the application, but rather as more detailed descriptions of certain aspects, features and embodiments of the application.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the application. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although the application has been described with reference to a preferred method, any method similar or equivalent to that described in this example can be used in the practice or testing of the application. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methodologies associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the application described herein without departing from the scope or spirit of the application. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present application. The specification and examples of the present application are exemplary only.
The terms "comprising," "including," "having," "containing," and the like as used in this embodiment are open ended terms, meaning including, but not limited to.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As shown in fig. 1 to 4, in this embodiment, a remote self-calibration system of a voltage transformer based on satellite common view is provided, including:
the system comprises a laboratory end and a module to be calibrated, wherein the module to be calibrated is connected with the laboratory end;
the laboratory end includes: the device comprises a calculator and a calibration end data acquisition unit connected with the calculator;
the module to be calibrated comprises: the system comprises a voltage transformer, a singlechip, a voltage source error compensation submodule, a transformer error compensation submodule and a calibrated end data acquisition unit; the calculator is in communication connection with the singlechip, and the calibrated end data acquisition unit are both connected with a satellite; the calibrated end data acquisition unit is also connected with the voltage transformer and the singlechip; the voltage source error compensation submodule is respectively connected with the voltage transformer and the singlechip; and the transformer error compensation submodule is respectively connected with the voltage transformer and the singlechip.
A remote self-calibration method of a remote self-calibration system of a voltage transformer based on satellite common view comprises the following steps:
a circuit switching instruction is sent to the singlechip through the computer to switch the circuit, so that the voltage transformer is switched from the working circuit to the measurement calibration circuit;
obtaining output voltage of a laboratory standard voltage source and input voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter; the method comprises the steps that a first GPS common view receiver in a laboratory terminal and a second GPS common view receiver in a module to be calibrated simultaneously acquire the same satellite pulse signal, and the time of acquiring the same satellite pulse signal by each common view receiver is subjected to difference to obtain a first time difference of acquiring the same satellite pulse signal between the laboratory terminal and the module to be calibrated;
acquiring an input end voltage error of the voltage transformer based on the first time difference and the corresponding frequency of each voltage; calibrating the input end voltage of the voltage transformer through a first voltage compensation circuit based on the input end voltage error;
after the voltage of the input end of the voltage transformer is calibrated, the output voltage of the laboratory standard voltage source is adjusted, so that the output voltage of the laboratory standard voltage source is the voltage which should be output when the transformer has zero error; acquiring the output voltage of the laboratory standard voltage source after adjustment and the output voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter;
acquiring a second time difference of acquiring the same satellite pulse signal between the laboratory end and the module to be calibrated; acquiring an output end voltage error of the voltage transformer based on the second time difference and the corresponding frequency of each voltage;
and acquiring a high-voltage transformer error of the voltage transformer under high voltage based on the output end voltage error, and adjusting and calibrating the voltage transformer through a second voltage compensation circuit based on the high-voltage transformer error. Based on theoretical analysis and early working experience, the error detection method of the voltage transformer is optimized, and a method for remotely calibrating the voltage transformer based on the GPS co-vision method is provided. The embodiment is based on the principle of satellite common view method and utilizes low-voltage calibration voltage transformer. The voltage magnitude can be converted in time and frequency by the voltage frequency conversion module, and a time difference, namely an error, is generated by standard and non-standard. The method is characterized in that data interaction between two places is realized by combining the Internet, input and output voltages of the voltage transformer are remotely calibrated through time and frequency, errors of the transformer under low voltage are calculated, errors of the transformer under high voltage are calculated through a correlation algorithm, and a circuit is designed to conduct error adjustment.
The basic principle of the common view method is that atomic clocks positioned at different two places can be used for time-frequency comparison by utilizing satellite time signals received at the same time in a GPS satellite view angle. The common-view receiver of the laboratory end and the calibration siteUnder the action of the common-view time table, the same GPS satellite signal is received at the same moment, and the time difference between the GPS second pulse and the local atomic clock second pulse is measured by using a time interval counter. After each measurement period is completed, laboratory data are transmitted to a calibration site through the Internet, then time difference data at two ends are subjected to difference to obtain time difference between two atomic clocks, and then voltage difference at two ends is obtained through the corresponding relation between the time difference and the frequency difference, so that remote calibration of voltage is completed. Let the clock time of the laboratory and the calibration field be t A 、t B The time difference between atomic clock second pulse and GPS second pulse at two ends is delta t AGPS 、Δt BGPS The following steps are:
Δt ABi ＝Δt AGPS -Δt BGPS ＝t A -t B
the relative frequency deviation of the two atomic clocks can be calculated by the method:
wherein f A 、f B The frequencies of the laboratory side and calibration field side clocks, respectively, τ being the average time interval.
The errors of the voltage transformer are mainly divided into no-load errors and load errors, but leakage current can be generated due to the fact that primary coil inter-turns, interlaminar and primary windings in the high-voltage transformer have distributed capacitances to secondary windings and ground, impedance voltage drops are generated by the leakage current through the primary windings and the secondary windings, and leakage current errors are brought to the voltage transformer.
The error of the high voltage transformer consists of no-load error, load error and leakage current error.
ε＝ε k +ε f +ε c
＝-Y 0 Z 1 -Y′(Z 1 +Z 2 ′)±Y C Z D
Epsilon in k Indicating no-load error, epsilon f Representing load error, ε e Indicating leakage current error, Z 1 、Z 2 、Z D Equivalent impedance of primary coil, secondary coil and leakage current respectively, Y 0 、Y′、Y C The admittances of the excitation, load and primary leakage current, respectively.
In the impedance Z of the coil 1 、Z 2 ' and Z D Are constant, secondary load admittance Y and leakage current admittance Y C Is also constant, thus ε f And epsilon c . Are all constant. Since the permeability of the transformer core is not constant, Y 0 Nor is it a constant, ε k As a function of voltage, i.e. as a function of core permeability.
In the high-voltage potential transformer, the admittance Y is due to leakage current C And leakage current error ε c Is unable to directly measure Y 0 And epsilon k When the voltage transformer is empty secondarily, i.e., Y' =0, the measured primary admittance is Y 0 +Y C The measured error is epsilon k +ε c Therefore, it is necessary to pass the difference Δy of the excitation admittance 0 Difference delta epsilon of no-load error k To calculate Z 1 The difference between the two low-pressure errors is DeltaY 0 Z 1 ，
From this, it can be seen that Y at different voltages is calculated 0 Z 1 Then the error epsilon=epsilon of the high voltage transformer under low voltage can be measured by the low voltage transformer k +ε f +ε c And by the difference DeltaY of no-load errors at different voltages 0 Z 1 And calculating the error of the transformer under high voltage.
The method comprises the following steps: before calibration begins, a voltage transformer to be calibrated is switched to a low-voltage measurement circuit, and the voltage of the input end of the transformer is provided by a singlechip power supply. And secondly, converting voltage parameters of the laboratory end standard voltage source and the input end of the voltage transformer to be calibrated into corresponding frequencies by utilizing a voltage frequency conversion module, converting the corresponding frequencies into time frequency magnitude values by a counter, taking a time difference by means of standard pulse signals received by a satellite receiver, calculating the error between the voltage of the input end of the voltage transformer to be calibrated and the laboratory end standard voltage source according to the time difference, designing a voltage compensation circuit, and calibrating the voltage of the input end of the voltage transformer to ensure that the voltage value of the input voltage transformer is definite and known. Finally, after the voltage is input into the transformer, the output voltage is remotely calibrated by the satellite by the same method, and the laboratory standard voltage source is regulated to the voltage which should be output when the transformer has zero error, so that the actual error output by the transformer can be accurately calculated. In the calibration process, the error of the voltage transformer under the low voltage is measured twice under different specified voltage standards, and the computer can calculate the error of the voltage transformer under the high voltage according to the difference value of the two errors, so as to adjust the error.
The error detection of the input and output voltages of the laboratory standard voltage and the calibration site voltage transformer is realized through the time-frequency remote transmission of the GPS satellite, the online detection method of the voltage transformer is combined with the satellite co-vision method, a detection device is not required to be built on site by related personnel, the calibration workload is reduced, and the intelligent development of the calibration technology is realized. According to the method, the error of the voltage transformer under the high voltage is calculated by checking the error of the voltage transformer under the low voltage according to the error principle of the voltage transformer, so that the remote calibration of the voltage transformer is realized.
To realize remote calibration of a voltage transformer, the error of the transformer is determined mainly by measuring the actual voltages input and output by the voltage transformer. By means of the idea, the voltage of the input end of the transformer is determined, the voltage which the transformer should output can be calculated according to the input voltage and the transformation coefficient of the transformer, the standard voltage source at the laboratory end is switched to the standard voltage value which the transformer should output, and the actual output voltage of the transformer is calibrated through a satellite common view method, so that the error of the transformer can be known.
The functions mainly realized at the laboratory end are divided into two parts. And firstly, providing an adjustable standard voltage, converting the standard voltage into a pulse signal, and transmitting the pulse signal to a verification field to provide a voltage calibration standard. And secondly, a calibration instruction is sent to a calibration field computer, so that the calibration field computer controls the voltage transformer to be calibrated to be switched into a measurement circuit. Fig. 2 is a workflow of switching measurement circuits, a laboratory end starts a measurement program, a circuit switching instruction is sent to a calibration field singlechip, and circuit switching is completed through control of the calibration field singlechip.
The work mainly completed by the verification field terminal is measurement and error adjustment of the transformer error. To realize remote calibration of the voltage transformer, the most important is to calibrate the input and output voltages of the transformer, thereby solving the error of the transformer. The measuring circuit is provided by a singlechip power supply, the voltage provided by the singlechip converts the voltage signal into a corresponding frequency signal through a high-precision voltage frequency converter module, and the converted actual frequency magnitude is measured through a counter. And combining pulse signals provided by the GPS common view receiver to obtain a time difference value between the voltage source signal and the satellite signal, and obtaining an error of voltage provided by the singlechip through the time difference between the laboratory end transmitted by the Internet and the satellite signal. Designing a voltage compensation circuit, and determining that the input voltage of the transformer is consistent with the standard voltage of the laboratory terminal;
the voltage compensation circuit is realized by means of open loop control, namely, the control mode of providing compensation voltage by taking the error of the transformer as the modulation signal of the inverter has the advantages of high response speed, high stability, simple control method and the like. The specific process is that even the voltage detected by the detection circuit generates a compensation signal determined by a compensation strategy through the control circuit, then forms a PWM signal through the pulse width modulation circuit to drive the circuit to control the switch of the power device of the inverter, finally filters out higher harmonic wave through the filter, and outputs the compensation voltage identical with the compensation instruction.
The embodiment uses a charge balance type voltage frequency conversion module, which uses a capacitor as a charge carrier, generates a current proportional to an input voltage to charge the capacitor, and simultaneously uses a known current source to periodically and reversely charge the capacitor, so as to fix a charging period, realize charge and discharge charge balance of the capacitor in the period, namely the period of an output signal, wherein the frequency of the output signal is proportional to the input voltage, and the working principle is as shown in fig. 3.
Determining a voltage transformerAfter the input voltage of the transformer is calibrated by the same method, the error of the transformer is calculated. After the error of the voltage transformer under low voltage is measured, the computer is required to calculate the error of the transformer under high voltage. From the formula (1-1), Y at different voltages is calculated 0 Z 1 The error epsilon=epsilon of the high-voltage transformer under low voltage can be measured k +ε f +ε e And by the difference DeltaY of no-load errors at different voltages 0 Z 1 To calculate the error of the transformer under high voltage. In the high-voltage transformer, Y cannot be directly measured due to the existence of leakage current admittance and leakage current error 0 And epsilon k . When the voltage transformer is empty for the second time, the primary admittance Y can be measured 0 +Y c The error obtained is epsilon k +ε c Therefore, Z can be found by the difference of excitation admittance and the difference of no-load error 1 The measurement flow is shown in fig. 4.
After the error of the transformer under high voltage is calculated, the computer stores the data into the appointed module, and the voltage compensation circuit is used for carrying out voltage compensation to complete the remote calibration of the voltage transformer.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. A remote self-calibration system for a voltage transformer based on satellite common view, comprising:
the system comprises a laboratory end and a module to be calibrated, wherein the module to be calibrated is connected with the laboratory end;
the laboratory end includes: the device comprises a calculator and a calibration end data acquisition unit connected with the calculator;
the module to be calibrated comprises: the system comprises a voltage transformer, a singlechip, a voltage source error compensation submodule, a transformer error compensation submodule and a calibrated end data acquisition unit; the calculator is in communication connection with the singlechip, and the calibrated end data acquisition unit are both connected with a satellite; the calibrated end data acquisition unit is also connected with the voltage transformer and the singlechip; the voltage source error compensation submodule is respectively connected with the voltage transformer and the singlechip; and the transformer error compensation submodule is respectively connected with the voltage transformer and the singlechip.
2. The remote self-calibration system of claim 1, wherein,
the calibration end data acquisition unit comprises a laboratory standard voltage source, a first voltage frequency converter, a first GPS common view receiver and a first counter which are connected in sequence; the first counter is also coupled to the calculator, and the first GPS receiver is also coupled to the satellite communication.
3. The remote self-calibration system of claim 1, wherein,
the calibrated end data acquisition unit specifically comprises: the system comprises a field voltage source, a second voltage-to-frequency converter, a second GPS common view receiver and a second counter; the field voltage source, the second voltage-frequency converter, the second GPS common view receiver and the second counter are connected in sequence; the second voltage-frequency converter is also connected with the voltage transformer; the second counter is also connected with the singlechip, and the second GPS common view receiver is also connected with the satellite in a communication way.
4. The remote self-calibration system of claim 1, wherein,
the voltage source error compensation submodule specifically comprises: the voltage source error signal acquisition module and the first compensation circuit module; one end of the voltage source error signal acquisition module is connected with the singlechip, the other end of the voltage source error signal acquisition module is connected with the first compensation circuit module, and the first compensation circuit module is also connected with the calibrated end data acquisition unit.
5. The remote self-calibration system of claim 1, wherein,
the transformer error compensation submodule specifically comprises: the transformer error signal acquisition module, the control operational amplifier and the second compensation circuit module;
the transformer error signal acquisition module, the control operational amplifier and the second compensation circuit module are sequentially connected, the transformer error signal acquisition module is used for acquiring a transformer error signal, and the second compensation circuit module is further connected with the voltage transformer.
6. The remote self-calibration method of a remote self-calibration system according to any one of claims 1 to 5, comprising:
step one: a circuit switching instruction is sent to the singlechip through the computer to switch the circuit, so that the voltage transformer is switched from the working circuit to the measurement calibration circuit;
step two: obtaining output voltage of a laboratory standard voltage source and input voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter;
step three: the method comprises the steps that a first GPS common view receiver in a laboratory terminal and a second GPS common view receiver in a module to be calibrated simultaneously acquire the same satellite pulse signal, and the time of acquiring the same satellite pulse signal by each common view receiver is subjected to difference to obtain a first time difference of acquiring the same satellite pulse signal between the laboratory terminal and the module to be calibrated;
step four: acquiring an input end voltage error of the voltage transformer based on the first time difference and the corresponding frequency of each voltage; calibrating the input end voltage of the voltage transformer through a first voltage compensation circuit based on the input end voltage error;
step five: after the voltage of the input end of the voltage transformer is calibrated, the output voltage of the laboratory standard voltage source is adjusted, so that the output voltage of the laboratory standard voltage source is the voltage which should be output when the transformer has zero error;
step six: acquiring the output voltage of the laboratory standard voltage source after adjustment and the output voltage of a voltage transformer in a module to be calibrated, and converting each voltage into corresponding frequency through a voltage-frequency converter;
acquiring a second time difference of acquiring the same satellite pulse signal between the laboratory end and the module to be calibrated; acquiring an output end voltage error of the voltage transformer based on the second time difference and the corresponding frequency of each voltage;
step seven: and acquiring a high-voltage transformer error of the voltage transformer under high voltage based on the output end voltage error, and adjusting and calibrating the voltage transformer through a second voltage compensation circuit based on the high-voltage transformer error.
7. The remote self-calibration method according to claim 6, wherein the computer sends a circuit switching instruction to the single-chip microcomputer to perform circuit switching, and the specific switching process comprises:
the program of the computer in the experimental end is initialized, the instruction receiving end is determined, after the determination, a circuit switching instruction is sent to the singlechip, the program in the singlechip is initialized, after the initialization, the determination of the circuit switching point is carried out, and after the circuit switching point is determined, the circuit switching is carried out.
8. The remote self-calibration method according to claim 6, wherein the specific calculation process for obtaining the first time difference and the second time difference comprises:
Δt ABi ＝Δt AGPS -Δt BGPS ＝t A -t B
wherein t is A 、t B Clock time, delta t, of the laboratory end and the module to be calibrated respectively AGPS 、Δt BGPS The time difference delta t between atomic clock second pulse and GPS second pulse of the clocks of the laboratory end and the module to be calibrated ABi Is the time difference between the laboratory end and the module to be calibrated.
9. The remote self-calibration method according to claim 6, wherein the obtaining the input voltage error of the voltage transformer based on the first time difference and the corresponding frequency of each voltage specifically comprises:
obtaining frequency difference data of the laboratory end and the module to be calibrated:
wherein f A 、f B The frequencies of the laboratory end and the module to be calibrated are respectively obtained by converting the voltage by a voltage-frequency converter; τ is the average time interval;
and reversely pushing the frequency difference data to obtain the voltage error of the input end.
10. The remote self-calibration method according to claim 6, wherein the obtaining the high voltage transformer error of the voltage transformer under high voltage based on the output voltage error comprises the following specific calculation process:
ε＝ε k +εf+ε c
＝-Y 0 Z 1 -Y′(Z 1 +Z 2 ′)±Y C Z D
wherein epsilon represents the error of the voltage transformer under low voltage k Indicating no-load error, epsilon f Representing load error, ε e Indicating leakage current error, Z 1 、Z 2 、Z D Equivalent impedance of primary coil, secondary coil and leakage current respectively, Y 0 、Y′、Y C The admittances of the excitation, load and primary leakage current, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311072741.6A CN117092579B (en) | 2023-08-24 | 2023-08-24 | Remote self-calibration method and system of voltage transformer based on satellite common view |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311072741.6A CN117092579B (en) | 2023-08-24 | 2023-08-24 | Remote self-calibration method and system of voltage transformer based on satellite common view |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117092579A true CN117092579A (en) | 2023-11-21 |
| CN117092579B CN117092579B (en) | 2024-06-18 |
Family
ID=88782563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311072741.6A Active CN117092579B (en) | 2023-08-24 | 2023-08-24 | Remote self-calibration method and system of voltage transformer based on satellite common view |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117092579B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2612956Y (en) * | 2003-04-17 | 2004-04-21 | 山西省机电设计研究院 | Voltage transformer on-site calibrating apparatus |
| CN204154886U (en) * | 2014-11-12 | 2015-02-11 | 成都天兴电气有限公司 | Based on voltage, the electric current precision metering device of satellite navigation system |
| CN105182273A (en) * | 2015-09-08 | 2015-12-23 | 中国电力科学研究院 | Calibration system used for verifying assembly line time value |
| CN113156356A (en) * | 2021-05-17 | 2021-07-23 | 河北大学 | Remote calibration system and calibration method for voltage source |
| CN114279466A (en) * | 2021-12-23 | 2022-04-05 | 中国电子科技集团公司第十四研究所 | Sensor error correction method |
| CN115792776A (en) * | 2022-12-02 | 2023-03-14 | 云南电力试验研究院(集团)有限公司 | Remote calibration system and method for alternating current voltage source |
-
2023
- 2023-08-24 CN CN202311072741.6A patent/CN117092579B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2612956Y (en) * | 2003-04-17 | 2004-04-21 | 山西省机电设计研究院 | Voltage transformer on-site calibrating apparatus |
| CN204154886U (en) * | 2014-11-12 | 2015-02-11 | 成都天兴电气有限公司 | Based on voltage, the electric current precision metering device of satellite navigation system |
| CN105182273A (en) * | 2015-09-08 | 2015-12-23 | 中国电力科学研究院 | Calibration system used for verifying assembly line time value |
| CN113156356A (en) * | 2021-05-17 | 2021-07-23 | 河北大学 | Remote calibration system and calibration method for voltage source |
| CN114279466A (en) * | 2021-12-23 | 2022-04-05 | 中国电子科技集团公司第十四研究所 | Sensor error correction method |
| CN115792776A (en) * | 2022-12-02 | 2023-03-14 | 云南电力试验研究院(集团)有限公司 | Remote calibration system and method for alternating current voltage source |
Non-Patent Citations (2)
| Title |
|---|
| LIDE FANG 等: "A New Model for Remote Calibration of Voltage Source Based on GPS Common-View Method", 《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》, 26 January 2023 (2023-01-26), pages 1 - 9 * |
| 张杰梁 等: "低校高式电压互感器现场校验仪校准系统的实现", 《计量技术》, 31 December 2014 (2014-12-31), pages 50 - 53 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117092579B (en) | 2024-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108535679B (en) | Accurate measurement method for harmonic voltage of capacitor voltage transformer based on interpolation method | |
| CN103543430B (en) | Standard modulus synchronous signal source | |
| CN106066425B (en) | A kind of impedance measurement device and its method for realizing compensation for calibrating errors | |
| CN106597351B (en) | A kind of implementation method of pair of electric energy meter checking device on-line real time monitoring | |
| CN104730485A (en) | GIS type current transformer test method | |
| CN110865238B (en) | Alternating current resistance measurement method and device based on quasi-harmonic model sampling algorithm | |
| Bucci et al. | Embedded power and energy measurement system based on an analog multiplier | |
| CN103647612A (en) | Attenuation measurement device for waveguide system | |
| CN117092579B (en) | Remote self-calibration method and system of voltage transformer based on satellite common view | |
| CN203249967U (en) | Nonlinear load electric energy metering device | |
| CN103728501B (en) | A kind of continuous iron loss measurement mechanism of electrical sheet and method | |
| CN105372614A (en) | Electronic type automatic zero-setting method and device | |
| CN210982602U (en) | High-accuracy three-phase standard electric energy meter with harmonic measurement function | |
| Djokic et al. | An optically isolated hybrid two-stage current transformer for measurements at high voltage | |
| CN205157758U (en) | Automatic zero -reset unit of electronic type | |
| CN103344826A (en) | Nonlinear load electric energy metering device | |
| CN210038140U (en) | Full-range self-calibration device for mutual inductor | |
| Liu et al. | A Metering Device for DC Energy Meters | |
| CN213023535U (en) | Calibration device for capacity tester based on standard phase | |
| DongXue et al. | Improvement of high-value capacitance measurement | |
| Shauerman et al. | Automated measuring device for microwave frequency terminals on the basis of logarithmic amplifier | |
| So et al. | A new current-comparator-based high-voltage low-power-factor wattmeter | |
| CN220933181U (en) | Remote calibration system for electric quantity metering chip of charging pile | |
| Shi et al. | Self-calibration and verification of phase angle errors of two voltage dividers at high frequencies | |
| CN217880042U (en) | Full-range voltage load box calibrator control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |