CN113311373A - Calibration method and calibration device for direct-current voltage transformer calibrator - Google Patents
Calibration method and calibration device for direct-current voltage transformer calibrator Download PDFInfo
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- CN113311373A CN113311373A CN202110704605.9A CN202110704605A CN113311373A CN 113311373 A CN113311373 A CN 113311373A CN 202110704605 A CN202110704605 A CN 202110704605A CN 113311373 A CN113311373 A CN 113311373A
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Abstract
The invention discloses a calibration method and a calibration device of a direct current voltage transformer calibrator, wherein the method comprises the following steps: controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor; self-calibrating the first signal and the second signal by using a self-calibration switcher to respectively obtain a third signal and a fourth signal; and processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result. The invention can solve the problems of zero position, temperature drift, standard divider resistance aging and the like of the calibration device of the direct current voltage transformer calibrator, and ensures the accuracy and reliability of the on-site test of the calibration device.
Description
Technical Field
The invention relates to the technical field of mutual inductor calibration, in particular to a calibration method and a calibration device of a direct-current voltage mutual inductor calibrator.
Background
With the rapid development of the direct current transmission technology, the super-high voltage and extra-high voltage transmission lines are applied in succession, and more than 30 direct current transmission projects in China and under construction are cut off. The direct-current voltage transformer is used as direct-current high-voltage primary sampling equipment, provides reliable and accurate signals for metering protection and monitoring, plays a vital role in a high-voltage direct-current power transmission system, and has performance related to the reliable operation of the whole direct-current power transmission system.
At present, various direct current transformer check meters have been used for checking direct current voltage transformers. However, in practical application, the phenomena of qualified laboratory verification and out-of-tolerance field verification often occur. The laboratory generally has little environmental electromagnetic interference under the conditions of reference temperature and the like, and at the moment, a calibration instrument constructed by a standard direct-current voltage source, a high-precision acquisition unit and the like can obtain a relatively accurate result. However, the dc voltage transformer operates outdoors, the electromagnetic interference on site is strong and complicated, and it is difficult to satisfy the conditions such as reference temperature in a laboratory if the dc voltage transformer is directly checked by a dc transformer checker. In addition, in practical application, the phenomenon that different calibration results of different calibration instruments are different, but the calibration instruments are qualified, so that a calibration worker needs to repeatedly measure for many times to ensure the accuracy of the calibration result. Therefore, the efficiency is low, and the accuracy and the reliability of the field verification of the direct-current voltage transformer are greatly influenced.
Disclosure of Invention
The invention aims to provide a calibration method and a calibration device of a direct-current voltage transformer calibrator, and aims to solve the technical problems that the existing transformer calibrator cannot be suitable for outdoor detection and cannot guarantee detection precision.
In order to overcome the defects in the prior art, the invention provides a calibration method of a direct current voltage transformer calibrator, which comprises the following steps:
controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
self-calibrating the first signal and the second signal by using a self-calibration switcher to respectively obtain a third signal and a fourth signal;
and processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
Further, the self-calibrating switch is used to self-calibrate the first signal and the second signal to obtain a third signal and a fourth signal, respectively, and the method includes:
controlling a first switch and a second switch of the self-calibration switcher to be grounded, and respectively recording zero-bit values of a standard channel and a detected channel;
controlling the first switch and the second switch to access a first signal of a standard channel, and recording amplitude calibration values of the standard channel and the detected channel;
and controlling the first switch and the second switch to access a first signal of a standard channel and a second signal of a detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
Further, the calibration method of the dc voltage transformer calibrator further includes: and calculating an error value of the detected channel according to the third signal and the fourth signal.
Further, the processing the third signal and the fourth signal by using the dc voltage transformer calibrator to generate a calibration result includes:
dividing the third signal and the fourth signal by using a first standard voltage dividing resistor and a second standard voltage dividing resistor respectively;
converting the divided third signal and the divided fourth signal by using a first front-end conditioning circuit and a second front-end conditioning circuit respectively;
measuring the converted third signal and fourth signal by using an AD sampling and control module, and generating measurement data;
and reading the measurement data by using a human-computer interaction module to generate a verification result.
Further, the self-calibration switcher employs an A/D converter, the A/D converter model number including ADS 1278.
Further, the self-calibrating switch employs an analog electronic switch.
The invention also provides a calibration device of the direct current voltage transformer calibrator, which comprises:
the signal receiving unit is used for controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
the self-calibration unit is used for self-calibrating the first signal and the second signal by utilizing a self-calibration switcher to respectively obtain a third signal and a fourth signal;
and the result output unit is used for processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
Further, the self-calibration unit is further configured to:
controlling a first switch and a second switch of the self-calibration switcher to be grounded, and respectively recording zero-bit values of a standard channel and a detected channel;
controlling the first switch and the second switch to access a first signal of a standard channel, and recording amplitude calibration values of the standard channel and the detected channel;
and controlling the first switch and the second switch to access a first signal of a standard channel and a second signal of a detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
The present invention also provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of calibrating a dc voltage transformer verifier as described in any of the above.
The present invention also provides a computer-readable storage medium having stored thereon a computer program for execution by a processor to implement the calibration method of the dc voltage transformer calibrator as described in any one of the above.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a calibration method and a calibration device of a direct current voltage transformer calibrator, wherein the method comprises the following steps: controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor; self-calibrating the first signal and the second signal by using a self-calibration switcher to respectively obtain a third signal and a fourth signal; and processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
The invention can solve the problems of zero position, temperature drift, standard divider resistance aging and the like of the calibration device of the direct current voltage transformer calibrator, and ensures the accuracy and reliability of the on-site test of the calibration device.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used 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 invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a calibration method of a dc voltage transformer calibrator according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an architecture principle of a calibration method of a dc voltage transformer calibrator according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of the substep of step S20 in FIG. 1;
FIG. 4 is a schematic diagram of the operation of the self-calibration switch according to an embodiment of the present invention
Fig. 5 is a flowchart illustrating a self-calibration switch verification method according to an embodiment of the invention;
FIG. 6 is a schematic flow chart of the substep of step S30 in FIG. 1;
fig. 7 is a schematic structural diagram of a calibration apparatus of a dc voltage transformer calibrator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not used as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
In a first aspect:
referring to fig. 1, an embodiment of the present invention provides a calibration method for a dc voltage transformer calibrator, including:
s10, controlling a detected channel and a standard channel of the direct current voltage transformer calibrator to receive a first signal and a second signal respectively; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
s20, self-calibrating the first signal and the second signal by using a self-calibration switcher to respectively obtain a third signal and a fourth signal;
and S30, processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
It should be noted that, in the prior art, there are many methods for checking a dc transformer, for example: firstly, carrying out a voltage division ratio test on a high-voltage divider body to obtain the actual linearity of the voltage divider and further obtain the actual rated output voltage of a low-voltage arm; and then, according to the actual rated output voltage of the low-voltage arm, an error experiment is performed on the secondary measurement system of the direct-current voltage transformer. The second type provides a device for checking the secondary measurement system of the direct-current voltage transformer aiming at the practical situation that the error of the direct-current voltage transformer is usually out of tolerance after long-term operation and the out-of-tolerance is more and more generated in the secondary measurement system of the direct-current voltage transformer. The method comprises the steps of applying a standard signal to a secondary measurement system of the direct current voltage transformer by adopting a standard direct current source, and realizing independent verification of the secondary measurement system of the direct current voltage transformer under the condition that high voltage is not applied to a primary bus side of the direct current transformer. And the third method is to adopt a high-frequency rectifying circuit as a high-precision voltage stabilizing source to verify the analog quantity output and the digital quantity output of the on-site direct-current voltage transformer. And the fourth method is to provide a digital quantity output DCVT on-site calibration system which can be used for calibrating the whole direct current voltage transformer. The core of the device is that a high-precision A/D converter in a checking device is arranged in front of a high-voltage divider body, signals are remotely transmitted by adopting digital quantity, and electromagnetic interference in voltage signal transmission can be avoided while checking according to field conditions.
However, these approaches have their own drawbacks, such as: in the first mode, potential safety hazards caused by long-time full-load operation of a direct-current high-voltage test power supply are avoided, and a method for separately checking a transformer high-voltage divider body and a secondary measurement system is adopted; the second and third methods use a standard voltage source with a lower output voltage, only verify the secondary measurement system, and do not perform a calibration test on the high-voltage divider body in the direct-current voltage transformer. Therefore, the mode and the implementation conditions in the above 3 cannot completely conform to the actual working conditions of the direct-current voltage transformer on site, and especially the overall performance of the transformer in a high-voltage electromagnetic field is not investigated. The fourth method is to apply rated high voltage to the direct current voltage transformer on site to carry out the overall verification of the direct current voltage transformer. The method puts forward a high-precision A/D converter in a checking device, and digital remote transmission is adopted for signals, so that the interference of voltage signal transmission is avoided. However, after the high-precision a/D converter is arranged in front, the higher electromagnetic interference is encountered, and whether the high-precision result can be output or not is not guaranteed. Meanwhile, a method for improving the accuracy of extracting the direct current signal by acquiring the direct current component through the wavelet coefficient containing the direct current component is also provided in the fourth mode, but under the condition of large environmental temperature difference, how to distinguish direct current changes caused by temperature drift and the like needs to be further researched to improve the accuracy of direct current voltage measurement. Therefore, in view of the problems in the prior art, the present embodiment aims to provide a calibration method for a dc voltage transformer calibrator, which can reduce electromagnetic interference and solve the defects of zero position, drift, aging of a standard voltage dividing resistor, and the like of a calibration apparatus.
Specifically, please refer to fig. 2, fig. 2 is a schematic diagram illustrating a calibration method according to an embodiment of the present invention; the verification method provided in this embodiment is explained based on the connection relationship as follows:
first, the self-calibration switch 03 is connected to the dc voltage transformer calibrator to perform a self-calibration process. Wherein, the structure of direct current voltage transformer check gauge includes: the device comprises a detected channel 01, a standard channel 02, a first standard voltage-dividing resistor 04, a second standard voltage-dividing resistor 05, a first front-end conditioning circuit 06, a second front-end conditioning circuit 07, an AD sampling and control module 08 and a human-computer interaction module 09. Specifically, the connection relationship is as follows:
1) the detected channel 01 is connected with the secondary output of the detected mutual inductor, and the secondary output analog quantity of the detected mutual inductor is input through the detected channel 01; the standard channel 02 is connected with the secondary output of the standard mutual inductor, and the secondary output analog quantity of the standard mutual inductor is input through the standard channel 02.
Based on this configuration, in step S10, the first signal and the second signal are received by the detected channel 01 and the standard channel 02, respectively; the first signal is a secondary output signal of the detected transformer, and the second signal is a secondary output signal of the standard transformer.
2) The detected channel 01 is connected with the self-calibration switcher 03, the standard channel 02 is connected with the self-calibration switcher 03, signal switching of the standard channel 02 and the detected channel 01 is achieved through the self-calibration switcher 03, and zero position and amplitude self-calibration of the verification device is achieved.
Based on this configuration, in step S20, the first signal and the second signal are self-calibrated by the self-calibration switch 03, and a third signal and a fourth signal are obtained, respectively.
In one embodiment, step S20 further includes the following sub-steps, as shown in fig. 3:
s201, controlling a first switch and a second switch of a self-calibration switcher to be grounded, and respectively recording zero values of a standard channel and a detected channel;
s202, controlling the first switch and the second switch to be connected into a first signal of a standard channel, and recording amplitude calibration values of the standard channel and a detected channel;
s203, controlling the first switch and the second switch to access the first signal of the standard channel and the second signal of the detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
In the present embodiment, the self-calibration handover measurement principle and the algorithm principle are shown in fig. 4. The self-calibration checking device controls the self-calibration switcher 03 in three steps through the AD sampling and control module 08, different on-off combinations of 2 switches are completed, and self-calibration sampling is achieved.
In one embodiment, the specific operation of self-calibrating handover measurement is shown in fig. 5, and includes:
a) controlling switches KP1 and KP2 of the self-calibration switcher 03 to enter a zero position (GND) measurement mode to perform zero position measurement, and recording a zero position value Uz1 of the standard channel 02 and a zero position value Uz2 of the detected channel 01;
b) switches KP1 and KP2 of the self-calibration switch 03 are switched on to be connected with Ub, the amplitude calibration mode measurement is carried out, and the amplitude calibration value U1 of the standard channel 02 and the amplitude calibration value U2 of the channel 01 to be detected are recorded;
c) switching switches KP1 to Ub and KP2 to Ux of the self-calibration switcher 03, entering a normal calibration mode, and recording a measured value U3 of the standard channel 02 and a detected channel 01 value U4; finally, the error value of the detected channel 01 (namely the detected mutual inductor) is calculated.
It should be noted that each test point needs to be calibrated in zero, then calibrated in amplitude, and finally calibrated in normal and error value. Therefore, each error value can be calculated after zero calibration and amplitude calibration. The calibration method can eliminate zero position and offset drift, reduce the aging and temperature drift of the device and ensure the accuracy of errors.
In addition, each error measurement of the self-calibration checking device needs 2 channels to perform 3 times of synchronous sampling, namely zero value self-calibration, amplitude self-calibration and normal checking measurement. The self-calibration method has the premise that the time for carrying out one-time error measurement is short enough, zero position and maladjustment can be considered to be basically stable and unchanged in the time for one-time error measurement, and the 2 channels are simultaneously interfered by the outside.
It is emphasized that the self-calibration method is implemented on the premise that the time for error measurement of each test point is sufficiently short. The self-calibrating verification device may use a high-speed A/D converter, such as ADS1278 by TI corporation, with a sampling rate of 12.8KHz and 3 samples per test point of approximately 234uS (3x1/12.8 KHz). Meanwhile, the switching speed and the setup time of the self-calibration switch 03 are required to be short enough, and the self-calibration switch 03 used in the embodiment of the present invention adopts an analog electronic switch, so that the switching speed is high, the setup time is short, and the switching process can be controlled at the uS magnitude. The 3-time sampling of one test point can be completed in 250uS at the fastest.
Further, in this embodiment, when the zero value is measured, the switches KP1 and KP2 are switched to GND, the input signals of the standard channel 02 and the detected channel 01 are both short-circuited to GND, the input signals can be regarded as a zero level, the AD sampling measurement values of the standard channel 02 and the detected channel 01 at this time are the zero value, and the software records the zero values Uz1 and Uz2 at this time.
Further, in this embodiment, when the amplitude calibration value is measured, KP1 is switched to the standard channel 02(Ub), KP2 is switched to the standard channel 02(Ub), the AD sampled measured values of the standard channel 02 and the detected channel 01 at this time are recorded, the AD sampled measured value of the standard channel 02 is U1, the AD sampled measured value of the detected channel 01 is U2, and the measured values of the detected and standard channels 02 at this time are the same standard quantity Ub, so that the amplitude difference between the two channels of the verification apparatus is Δ U — U1-U2, and Δ U is the amplitude calibration value.
Further, in this embodiment, when measuring actual values, KP1 is held in the standard channel 02(Ub), KP2 is switched to the detected channel 01(Ux), and AD sample measurement values of the standard channel 02 and the detected channel 01 at this time are recorded, where the AD sample measurement value of the standard channel 02 is U3, and the AD sample measurement value of the detected channel 01 is U4.
Further, during the self-calibration algorithm, the measurement value of the standard channel 02 is Uz1, the measurement value of the detected channel 01 is Uz2, the compensation value of amplitude self-calibration is Δ U, the measurement value of the ADC of the standard channel 02 under normal measurement is U1, the measurement value of the AD of the detected channel 01 is U2, and at this time, the overall calibration error ∈ of the dc transformer is:
in the formula, (U1-delta U-Uz1) is a measured value of the standard channel 02 after amplitude and zero self-calibration, and (U2-Uz2) is a measured value of the detected direct current transformer after zero self-calibration.
3) The self-calibration switcher 03 is connected with the first standard voltage dividing resistor 04, and a signal switched by the self-calibration switcher 03 is input to the first standard voltage dividing resistor 04 for voltage dividing processing; the self-calibration switch 03 is electrically connected to the second standard voltage dividing resistor 05, and a signal switched by the self-calibration switch 03 is input to the second standard voltage dividing resistor 05 to perform voltage dividing processing. It should be noted that, the on-site verification has high requirements on the time and temperature stability of the standard voltage-dividing resistor, and it is difficult to ensure that the requirements are met. By adopting the connection relation provided by the embodiment to carry out verification, the requirements and the cost of the device can be greatly reduced aiming at the same verification accuracy, and the influence of time and temperature change of the device can be automatically eliminated.
4) The self-calibration switch 03 is connected to the AD sampling and control module 08, and the AD sampling and control module 08 can control the self-calibration switch 03 to switch to various measurement modes.
5) The first standard voltage dividing resistor 04 is connected with the first front-end conditioning circuit 06, and the divided signal is processed by the first front-end conditioning circuit 06 and then sent to the AD sampling and control module 08; the second standard voltage dividing resistor 05 is connected to the second front-end conditioning circuit 07, and the divided signal is further processed by the second front-end conditioning circuit 07 and then sent to the AD sampling and control module 08.
6) The first front-end conditioning circuit 06 is connected with the AD sampling and control module 08, and the signal is converted into a signal suitable for AD sampling by the first front-end conditioning circuit 06 and sent to the AD sampling and control module 08; the second front-end conditioning circuit 07 is connected with the AD sampling and control module 08, and the signal is converted into a signal suitable for AD sampling by the second front-end conditioning circuit 07 and sent to the AD sampling and control module 08.
7) The AD sampling and control module 08 is connected with the man-machine interaction module 09, the man-machine interaction module 09 comprises upper-layer software, a display screen and a touch screen, and the upper-layer software controls and reads data of the AD sampling and control module 08, completes self-calibration processing and gives a calibration result.
Based on the configurations of 3) to 7), the third signal and the fourth signal are processed by the dc voltage transformer calibrator to generate a calibration result in step S30.
In one embodiment, step S30 further includes the following sub-steps, as shown in fig. 6:
s301, performing voltage division processing on the third signal and the fourth signal by using a first standard voltage division resistor and a second standard voltage division resistor respectively;
s302, converting the divided third signal and the divided fourth signal by using a first front-end conditioning circuit and a second front-end conditioning circuit respectively;
s303, measuring the converted third signal and fourth signal by using an AD sampling and control module, and generating measurement data;
and S304, reading the measurement data by using a human-computer interaction module to generate a verification result.
In one embodiment, the AD sampling and control module 08 is configured to convert analog voltage signals input by the standard channel 02 and the detected channel 01 into digital signals. The AD sampling chip adopts TI ADS1278 with 24bit resolution and sampling rate up to 144 kHz.
In one embodiment, the human-computer interaction module 09 is composed of an industrial personal computer, an input device and a display device, wherein the input device further includes: common input devices such as a TFT liquid crystal display, a mouse, a keyboard and the like; the man-machine interaction module 09 runs a windows operating system, control software of the system runs on an industrial personal computer, reading of measured data and self-calibration processing can be automatically completed, and a calibration result is given.
According to the verification method provided by the embodiment of the invention, through high-speed synchronous sampling, the potential safety hazard that a high-voltage power supply runs under a rated voltage for a long time is avoided; through the self-calibration switcher 03, electromagnetic interference is reduced, the problems of zero position, drift, aging of standard voltage-dividing resistors and the like of the calibration device are solved, and the accuracy and reliability of on-site testing of calibration work are ensured.
In a second aspect:
referring to fig. 7, an embodiment of the present invention further provides a calibration apparatus for a dc voltage transformer calibrator, including:
the signal receiving unit 001 is used for controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
a self-calibration unit 002, configured to perform self-calibration on the first signal and the second signal by using a self-calibration switcher, so as to obtain a third signal and a fourth signal, respectively;
and the result output unit 003 is configured to process the third signal and the fourth signal by using a dc voltage transformer calibrator, and generate a calibration result.
Further, the self-calibration unit 003 is further configured to:
controlling a first switch and a second switch of the self-calibration switcher to be grounded, and respectively recording zero-bit values of a standard channel and a detected channel;
controlling the first switch and the second switch to access a first signal of a standard channel, and recording amplitude calibration values of the standard channel and the detected channel;
and controlling the first switch and the second switch to access a first signal of a standard channel and a second signal of a detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
It should be noted that the verification apparatus provided in the embodiment of the present invention is configured to execute the verification method according to the first aspect. The calibration device avoids the potential safety hazard that the high-voltage power supply runs under the rated voltage for a long time through high-speed synchronous sampling; through the self-calibration switcher, electromagnetic interference is reduced, the problems of zero position, drift, aging of standard voltage-dividing resistors and the like of the calibration device are solved, and the accuracy and reliability of field test of the calibration device are ensured.
In a third aspect:
an embodiment of the present invention further provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the verification method of the dc voltage transformer verification apparatus as described above.
The processor is used for controlling the overall operation of the terminal equipment so as to complete all or part of the steps of the checking method of the direct current voltage transformer checking device. The memory is used to store various types of data to support operation at the terminal device, and these data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as 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 disk, or optical disk.
The terminal Device may be implemented by one or more Application Specific1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to perform the method for calibrating the dc voltage transformer calibration apparatus according to any one of the embodiments described above, and achieve the technical effects consistent with the above methods.
An embodiment of the present invention further provides a computer readable storage medium including program instructions, which when executed by a processor implement the steps of the method for verifying the dc voltage transformer verifying apparatus according to any one of the embodiments. For example, the computer-readable storage medium may be the above-mentioned memory including program instructions, and the above-mentioned program instructions may be executed by a processor of a terminal device to implement the verification method of the dc voltage transformer verification apparatus according to any one of the above-mentioned embodiments, and achieve the technical effects consistent with the above-mentioned method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A calibration method of a direct current voltage transformer calibrator is characterized by comprising the following steps:
controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
self-calibrating the first signal and the second signal by using a self-calibration switcher to respectively obtain a third signal and a fourth signal;
and processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
2. The method of calibrating a dc voltage transformer calibrator according to claim 1, wherein the self-calibrating switch is configured to self-calibrate the first signal and the second signal to obtain a third signal and a fourth signal, respectively, and the method comprises:
controlling a first switch and a second switch of the self-calibration switcher to be grounded, and respectively recording zero-bit values of a standard channel and a detected channel;
controlling the first switch and the second switch to access a first signal of a standard channel, and recording amplitude calibration values of the standard channel and the detected channel;
and controlling the first switch and the second switch to access a first signal of a standard channel and a second signal of a detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
3. The calibration method of the dc voltage transformer calibrator according to claim 2, further comprising: and calculating an error value of the detected channel according to the third signal and the fourth signal.
4. The method for calibrating a dc voltage transformer calibrator according to claim 1, wherein the processing the third signal and the fourth signal with the dc voltage transformer calibrator to generate the calibration result comprises:
dividing the third signal and the fourth signal by using a first standard voltage dividing resistor and a second standard voltage dividing resistor respectively;
converting the divided third signal and the divided fourth signal by using a first front-end conditioning circuit and a second front-end conditioning circuit respectively;
measuring the converted third signal and fourth signal by using an AD sampling and control module, and generating measurement data;
and reading the measurement data by using a human-computer interaction module to generate a verification result.
5. The calibration method of the direct current voltage transformer calibrator according to any one of claims 1 to 4, wherein the self-calibration switcher employs an A/D converter, and the A/D converter model includes ADS 1278.
6. The method for calibrating a dc voltage transformer calibrator according to any one of claims 1 to 4, wherein the self-calibration switcher employs an analog electronic switch.
7. The utility model provides a calibrating device of direct current voltage transformer check gauge which characterized in that includes:
the signal receiving unit is used for controlling a detected channel and a standard channel of the direct-current voltage transformer calibrator to respectively receive a first signal and a second signal; the first signal is a secondary output signal of the detected mutual inductor, and the second signal is a secondary output signal of a standard mutual inductor;
the self-calibration unit is used for self-calibrating the first signal and the second signal by utilizing a self-calibration switcher to respectively obtain a third signal and a fourth signal;
and the result output unit is used for processing the third signal and the fourth signal by using a direct-current voltage transformer calibrator to generate a calibration result.
8. The calibration device of the dc voltage transformer calibrator according to claim 7, wherein the self-calibration unit is further configured to:
controlling a first switch and a second switch of the self-calibration switcher to be grounded, and respectively recording zero-bit values of a standard channel and a detected channel;
controlling the first switch and the second switch to access a first signal of a standard channel, and recording amplitude calibration values of the standard channel and the detected channel;
and controlling the first switch and the second switch to access a first signal of a standard channel and a second signal of a detected channel respectively, and taking the obtained measured value of the standard channel and the measured value of the detected channel as a third signal and a fourth signal respectively.
9. A terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of calibrating a dc voltage transformer verifier as recited in any of claims 1-6.
10. A computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement a calibration method of a dc voltage transformer verifier according to any one of claims 1 to 6.
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Application publication date: 20210827 |