CN113267743A - Method and instrument for checking DC voltage transformer - Google Patents
Method and instrument for checking DC voltage transformer Download PDFInfo
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- CN113267743A CN113267743A CN202110744847.0A CN202110744847A CN113267743A CN 113267743 A CN113267743 A CN 113267743A CN 202110744847 A CN202110744847 A CN 202110744847A CN 113267743 A CN113267743 A CN 113267743A
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- 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
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Abstract
The invention discloses a calibration method and a calibration instrument of a direct-current voltage transformer, wherein the calibration instrument comprises a human-computer interaction module used for sending an output parameter and a control command to an error calculation module; the error calculation module is used for controlling the standard voltage source to output a first voltage value according to the output parameter and the control command; the standard voltage source is used for inputting the first voltage value to the detected direct current voltage transformer so as to enable the detected direct current voltage transformer to output a corresponding voltage signal; the front-end conditioning circuit is used for converting the voltage signal; the AD sampling measurement module is used for calculating a second voltage value corresponding to the conversion signal and sending the second voltage value to the error calculation module; and the error calculation module is also used for calculating the error of the detected direct current voltage transformer according to the first voltage value and the second voltage value. The invention can output direct-current voltage and high-voltage signals with superposed ripples, tests the frequency performance of the mutual inductor, and has the advantages of small volume, high accuracy, good stability and strong practicability.
Description
Technical Field
The invention relates to the technical field of transformer calibration, in particular to a calibration method and a calibration instrument of a direct-current voltage transformer.
Background
With the development of power technology, the proportion of direct-current transmission systems in power grids in China is getting larger and larger, and the stable and reliable operation of the direct-current transmission systems is the primary task of ensuring the quality of the power grids. The direct-current voltage transformer is used as a key device for metering protection, and the accuracy of the direct-current voltage transformer can directly determine the stability of a direct-current power transmission system. Therefore, the calibration work of the direct current voltage transformer is very critical.
At present, the verification of a voltage signal output by a direct-current voltage transformer is mainly realized by matching and using equipment such as a direct-current voltage source, a standard direct-current voltage transformer, a direct-current voltage transformer calibrator and the like, and the method often has the problems of more equipment, complex verification system and inconvenience for field operation. In addition, because the output current of the dc transmission system often contains ripples, an additional frequency response experiment needs to be performed on the dc voltage transformer, and the experiment can be performed only by additionally configuring equipment such as a dc voltage source, a standard dc voltage transformer, and a dc voltage transformer calibrator. Therefore, the existing calibration device often cannot measure the voltage and frequency characteristics of the mutual inductor at the same time, and the practical situation is often not considered when the calibration device is applied, so that the calibration efficiency is low, and the calibration accuracy is difficult to guarantee.
Disclosure of Invention
The invention aims to provide a method and a device for checking a direct-current voltage transformer, which aim to solve the technical problems of more equipment, complex system, low measurement efficiency, incomplete functions and low accuracy of the conventional checking device.
In order to overcome the defects in the prior art, the invention provides a direct current voltage transformer calibrator, which comprises:
the human-computer interaction module is used for sending the output parameters and the control commands of the standard voltage source to the error calculation module;
the error calculation module is used for controlling the standard voltage source to output a first voltage value according to the output parameter and the control command;
the standard voltage source is used for inputting the first voltage value to a detected direct current voltage transformer so that the detected direct current voltage transformer outputs a corresponding voltage signal;
the front-end conditioning circuit is used for converting the voltage signal to obtain a conversion signal;
the AD sampling measurement module is used for calculating a second voltage value corresponding to the conversion signal and sending the second voltage value to the error calculation module;
and the error calculation module is further used for calculating the error of the detected direct current voltage transformer according to the difference value between the first voltage value and the second voltage value.
Further, the standard voltage source is driven by a low-voltage driving high-voltage mode, and the threshold value of the output voltage is 1200V; the standard voltage source is also used for outputting any ripple waves of direct current and direct current superposition within 0-3 kHz.
Further, the standard voltage source inputs the first voltage value to the detected direct current voltage transformer through a standard voltage output port;
and the detected direct current voltage transformer transmits the voltage signal to the front-end conditioning circuit through a detected voltage input port.
Further, the first voltage value acts on the primary side of the detected direct current voltage transformer; and the detected direct current voltage transformer outputs the voltage signal through a secondary side.
Furthermore, the human-computer interaction module comprises a display screen and a touch screen.
Further, the human-computer interaction module is also used for checking the frequency performance of the detected direct current voltage transformer under different voltages.
Further, the chip adopted by the AD sampling measurement module is ADS 1278.
The invention also provides a method for checking the direct-current voltage transformer, which comprises the following steps:
the man-machine interaction module sends the output parameters of the standard voltage source and the control command to the error calculation module;
the error calculation module controls the standard voltage source to output a first voltage value according to the output parameter and the control command;
the standard voltage source inputs the first voltage value to a detected direct current voltage transformer so that the detected direct current voltage transformer outputs a corresponding voltage signal;
the front-end conditioning circuit converts the voltage signal to obtain a conversion signal;
the AD sampling measurement module calculates a second voltage value corresponding to the conversion signal and sends the second voltage value to the error calculation module;
and the error calculation module calculates the error of the detected direct current voltage transformer according to the difference value of the first voltage value and the second voltage value.
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 the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method for verifying a dc voltage transformer as described above.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which is executed by a processor to implement the method of verifying a dc voltage transformer as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a direct-current voltage transformer calibrator which comprises a human-computer interaction module, an error calculation module and a control module, wherein the human-computer interaction module is used for sending output parameters and control commands of a standard voltage source to the error calculation module; the error calculation module is used for setting and controlling the standard voltage source to output a first voltage value according to the output parameters and the control command; the standard voltage source is used for applying a first voltage value to the detected direct current voltage transformer so as to enable the detected direct current voltage transformer to output a corresponding voltage signal; the front-end conditioning circuit is used for converting the voltage signal; the AD sampling measurement module is used for calculating a second voltage value corresponding to the conversion signal and sending the second voltage value to the error calculation module; and the error calculation module is also used for calculating the error of the detected direct current voltage transformer according to the first voltage value and the second voltage value. The check meter provided by the invention can output direct-current voltage and high-voltage signals with superposed ripples through the built-in voltage source, the amplitude range is 0-1200V, the frequency range is 0-3kHz, and the built-in voltage source can be used as a standard voltage source without a standard voltage transformer; simultaneously, this check gauge can output direct current voltage and the high voltage signal of superimposed ripple to carry out frequency performance test to the mutual-inductor, have small, the degree of accuracy is high, stability is good, the advantage that the practicality is strong.
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 structural diagram of a dc voltage transformer calibrator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a standard voltage source provided by an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for verifying a dc voltage transformer according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating steps of a method for verifying a dc voltage transformer according to another 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 dc voltage transformer calibrator, including:
the human-computer interaction module 01 is used for sending the output parameters and the control commands of the standard voltage source 03 to the error calculation module 02;
the error calculation module 02 is configured to control the standard voltage source 03 to output a first voltage value according to the output parameter and the control command;
the standard voltage source 03 is configured to input the first voltage value to the detected dc voltage transformer, so that the detected dc voltage transformer outputs a corresponding voltage signal;
the front-end conditioning circuit 04 is configured to convert the voltage signal to obtain a conversion signal;
the AD sampling measurement module 05 is configured to calculate a second voltage value corresponding to the converted signal, and send the second voltage value to the error calculation module 02;
and the error calculation module 02 is further configured to calculate an error of the detected dc voltage transformer according to a difference between the first voltage value and the second voltage value.
It should be noted that, there are many methods for checking a dc transformer in the prior art, including: the first one is realized by a converter station direct current voltage transformer broadband transfer characteristic test system, the system comprises 3 voltage power units with output interfaces, the voltage power units can respectively provide direct current with the amplitude of 0-2kV, alternating current voltage with the amplitude of 50Hz-5kHz and voltage with the maximum amplitude of 120V and the frequency of 0-5kHz, and the voltage power units are used for testing the broadband transfer characteristic of the output direct current voltage transformer. The second one is to provide a system and a method for carrying out wideband calibration on a direct current voltage transformer, the method adopts a specially designed wideband booster with 50Hz-3kHz to output voltage signals, and can carry out accurate calibration on the alternating current performance of the direct current voltage transformer to be tested within the frequency range of 50Hz-3kHz and the amplitude range of 1kV-100 kV. And the third method mainly comprises the step of providing a digital quantity output DCVT field calibration system, wherein the frequency band inconsistency of a standard voltage channel and a frequency band of a direct current voltage transformer is considered, the system adopts a wavelet coefficient containing a direct current component to obtain the direct current component, the accuracy of direct current signal extraction is improved, and the influence of alternating current ripples on the direct current calibration accuracy is reduced. The fourth type is mainly to provide a direct current transformer calibrator with a master-slave machine structure, which comprises a direct current transformer calibrator host and a direct current transformer calibrator slave, when the distance between the on-site standard direct current transformer and the direct current transformer to be tested is far, the master-slave machine can be used in a matched mode, and the master-slave machine displays the current calibration error on the host after data interaction is carried out between the master machine and the slave machine in a wireless mode, so that the problem of remote influence between the on-site standard transformer and the calibrator is solved, and the convenience of on-site calibration is improved.
However, these methods have their own drawbacks, and the first and second methods propose to perform wideband calibration on the dc voltage transformer, and mainly solve the problem of the wideband voltage power source. But the checking system is not simplified and even more cumbersome or complex, which is not conducive to field operation. The third method mainly provides a method for improving the direct current extraction accuracy, reduces the influence of ripples on a direct current voltage check result, but cannot test the frequency characteristic of the direct current voltage transformer, and in practical use, if the harmonic content is rich, the direct current check accuracy needs to be investigated. Although the three methods provide methods for direct current measurement and frequency experiment of the direct current voltage transformer, the actual use condition of the field is not considered, and the verification efficiency is low or the verification accuracy is difficult to guarantee. Although the fourth method solves the problem of the distance between the on-site standard direct current transformer and the detected direct current transformer (or the calibrator), the slave structure is added, so that the calibration device becomes more complicated, and only the direct current voltage can be calibrated. Therefore, the existing calibration device cannot give consideration to the test function, the calibration efficiency and the convenience of use, and in this embodiment, mainly a calibration instrument is provided, which is different from the existing calibration device for the measurement and frequency performance of the dc voltage transformer to be calibrated (6 devices are required, namely, a dc voltage source, a dc transformer calibration instrument, a standard dc voltage transformer, an ac high-frequency voltage source, a standard ac voltage transformer and an ac transformer calibration instrument).
Specifically, as shown in fig. 1, a standard voltage source 03 is arranged in the calibration instrument, and an external direct-current voltage source and an external alternating-current voltage source are firstly omitted; the method comprises the steps that a standard source mode is adopted to calibrate the detected direct current voltage transformer, a measured value is directly applied to the detected direct current transformer through a voltage standard source, the accuracy of the output value of the direct current voltage standard source can be ensured, a direct current or alternating current standard transformer is not needed to measure the primary side, and a standard direct current voltage transformer and a standard alternating current voltage transformer configured in the prior art are omitted; the built-in standard voltage source 03 can output standard voltage of direct current and direct current superposed ripples, integrates functions of the direct current calibrator and the alternating current calibrator, simultaneously realizes the calibration of direct current frequency performance and alternating current frequency performance of the direct current transformer to be tested, and saves an alternating current transformer calibrator configured in the prior art.
Further, this direct current voltage transformer check gauge includes: the system comprises a standard voltage source 03, a front-end conditioning circuit 04, an AD sampling measurement module 05, an error calculation module 02 and a human-computer interaction module 01;
the standard voltage output port 06 is connected with the primary input of the detected direct current voltage transformer to apply a measured value to the detected transformer;
the detected voltage input port 07 is connected with the secondary output of the detected mutual inductor, and the secondary output of the detected mutual inductor is input into the calibrator through the detected voltage input port 07;
the standard voltage source 03 is connected with the standard voltage output port 06, and the standard voltage source 03 is used for measuring the primary application of the detected direct current voltage transformer through the standard voltage output port 06;
the detected voltage input port 07 is connected with the front-end conditioning circuit 04, a secondary output voltage signal of the detected direct-current voltage transformer is input to the calibrator through the detected voltage input port 07, the secondary input voltage signal of the detected direct-current voltage transformer is converted into a voltage signal suitable for AD sampling measurement through the front-end conditioning circuit 04, and the voltage signal is sent to the AD sampling measurement module 05 and calculated;
the error calculation module 02 is connected with the standard voltage source 03, receives the setting parameters of the human-computer interaction module 01, sets and controls the standard voltage source 03 to output a corresponding output voltage value, and applies the measured value to the detected direct-current voltage transformer at one time;
the error calculation module 02 is connected with the AD sampling measurement module 05, the AD sampling measurement module 05 performs sampling calculation on the secondary output voltage signal of the detected direct-current voltage transformer, the error calculation module 02 reads data of the AD sampling measurement module 05, the data are compared with the set output value of the standard voltage source 03, and the error of the detected direct-current voltage transformer is calculated;
the human-computer interaction module 01 is connected with the error calculation module 02, the human-computer interaction module 01 sends the output parameters and the control commands of the standard voltage source 03 to the error calculation module 02 through serial port communication, and the human-computer interaction module 01 can read the verification errors of the detected direct-current voltage transformer in the error calculation module 02.
The calibration instrument provided by the embodiment of the invention can complete the metering and frequency performance calibration of the DC voltage transformer to be tested only by one device through the built-in standard voltage source 03, and solves the problems that the metering and frequency experiment detection of the DC voltage transformer need more devices, the volume is large, the wiring is complex, the requirement on operators is high, the use is complicated, and the calibration efficiency is low.
In a specific embodiment, the human-computer interaction module 01 comprises a display screen and a touch screen, upper software is adopted, a user controls the upper software to set parameters and send instructions, the rated voltage of the detected direct-current voltage transformer is set to be UN, measurement performance verification of 5 working points including 10% UN, 20% UN, 50% UN, 80% UN and 100% UN is sequentially completed, each working point comprises various conditions of no ripple superposition and ripple superposition within 0-3kHz, and the like, and is used for completing verification of the frequency performance of the detected direct-current transformer, so that the measurement and the frequency performance verification of the detected direct-current voltage transformer are completed.
In a specific embodiment, for the direct operational amplifier output mode, the output voltage range of the integrated operational amplifier is limited, so that high voltage output of 1kV or more cannot be realized; for the transformer boosting mode, the output bandwidth is low, and the output from direct current to 3KHz is difficult to realize. Therefore, in the implementation, the standard voltage source 03 adopts a linear power amplification scheme and a low-voltage driving high-voltage mode, so that 1200V high-voltage output can be realized, the power bandwidth is large, direct current superposition random ripple output within 0-3KHz can be realized, the output accuracy and stability are high, and the standard source method is suitable for verifying the direct current voltage transformer to be verified. Standard source method: the measured value is directly applied to the detected device through the standard source, the output value of the standard source is ensured to be accurate enough, and the standard quantity is not required to be measured additionally.
Specifically, the principle of the standard voltage source 03 in this embodiment is as shown in fig. 2, and the standard voltage source 03 mainly includes a Vin signal generator, an OPA2277 operational amplifier, R1, R2 precision resistors, a power module, and a MOS transistor WPH 4003. The Vin signal generator is connected with the precise feedback resistor array, the Vin signal is connected with the operational amplifier OPA2277, and high-precision closed-loop feedback control of high-voltage output is completed through the operational amplifier, the high-precision Vin signal and the precise feedback resistors R2 and R1, so that high-voltage output with high accuracy and high stability is realized; the OPA2277 operational amplifier is connected with the MOS tube WPH4003, and the output of the OPA2277 operational amplifier drives the MOSWPH4003 to realize low-voltage control and high-voltage output; the MOS tube WPH4003 is connected with the power supply module, the power supply module supplies power to the MOS tube WPH4003, and high-voltage output is achieved through OPA2277 operational amplifier closed-loop feedback control; the MOS tube WPH4003 is connected with the output through triodes of current-limiting resistors R3 and 9013, the current-limiting resistors R3 and 9013 form an output protection circuit, short circuit and overload protection of high-voltage output is achieved, reliability of the standard voltage source 03 is improved, and the MOS tube WPH4003 achieves high-precision and high-voltage output under feedback control of an OPA2277 operational amplifier.
In addition, the standard voltage source 03 circuit comprises a low-offset operational amplifier OPA2277 and a MOS tube WPH4003 power field effect tube, and a triode and a current-limiting resistor are used for realizing overload protection and preventing the MOS tube from being damaged due to overlarge current. The source output of the MOS transistor WPH4003 is used as a reference ground, and the negative end of the input voltage is used as the output end Vout of the whole high-voltage amplification circuit. The operational amplifier is powered by external +/-15V voltage, and the inverting input end is connected with a signal ground through a resistor and is grounded with an OPA2277 power supply; the in-phase input end is respectively connected with an input control signal Vin and an output end Vout through two precision resistors, and closed-loop negative feedback is carried out through voltage division. The whole circuit can be equivalent to an inverting proportional amplifier which introduces voltage parallel negative feedback. According to the 'virtual short and virtual break' of the operational amplifier, the non-inverting input end of the operational amplifier is virtual ground, so that the input and output have the following relations: . The output value of the voltage can be set by changing the proportional values of R2 and R1, and the range of Vin signals in the standard voltage source 03 is-10-0V, so that the proportional values of R2 and R1 are set to 120 times, and the voltage output of 1200V can be met.
Specifically, the active device in the whole circuit is only connected with high voltage between the drain electrode and the source electrode of the MOS transistor WPH4003, and the circuit needs to output 1200V direct-current voltage to the maximum extent, so that an N-type field effect transistor with high power and withstand voltage higher than 1400V needs to be selected. The Vdds of the WPH4003 is 1700V, the current can reach 3A at most, the maximum power is 55W, and the requirements can be met.
Specifically, Vin signal generation adopts DSP and high-speed DAC to complete signal generation control of a direct-current voltage standard source, can output direct-current signals and direct-current superposed ripple signals with high precision, high-precision DAC for 0-3KHz signals can be realized, DSP is used as a controller, a floating point operation unit is arranged in the controller, the main frequency is high, and the digital signal processing device is particularly suitable for digital signal processing and signal generation and control.
Specifically, the operational amplifier, as can be seen from the schematic diagram of the circuit, operates in a low voltage state, and only needs to use an ultra-low offset operational amplifier. The amplifying loop selects OPA2277 for operational amplification, OPA2277 has 134dB open-loop gain, ultra-low offset voltage: 10uV, extremely low temperature drift: 0.1 uV/DEG C, the bandwidth gain product can reach 1MHz, and the design requirement can be met.
Specifically, the precision resistor is a low-temperature-drift high-precision platinum resistor, and voltage parallel negative feedback is based on two precision platinum resistors for feedback, so that the output precision of a direct-current voltage standard source is directly influenced by the proportional change of the two resistance values, and therefore the low-temperature-drift high-precision resistor is selected.
Specifically, the power module is realized by adopting a mode of boosting, rectifying and filtering of a transformer, the circuit is simple in structure, high in reliability and small in size, different primary and secondary turn ratios can realize voltage output in different proportions, the high-voltage output is suitable, and meanwhile, the primary and secondary sides of the power module are electrically and completely isolated, and the safety is high.
In a specific embodiment, the error calculation module 02 mainly aims to calculate the error of the detected dc voltage transformer by comparing the standard value output by the standard voltage source 03 with the secondary output value of the detected dc transformer measured by AD sampling, and combining the transformation ratio coefficient of the detected dc voltage transformer; the error calculation module 02 can receive software commands of an upper computer, such as parameter setting, transformation ratio coefficients of the detected transformer and the like, and returns error data to a human-computer interaction interface for display, and the error calculation module 02 can control and read the output value of the standard voltage source 03 and compare the output value with an AD (analog-to-digital) measured value to calculate the direct current error and the alternating current error of the detected direct current transformer.
In a specific embodiment, the front-end conditioning circuit 04 is connected to the detected voltage input channel, the secondary output of the detected dc voltage transformer is input into the calibrator through the detected voltage input channel, the secondary voltage of the detected dc voltage transformer is conditioned into a voltage signal suitable for AD acquisition by the front-end conditioning circuit 04, and the voltage signal is sent to AD sampling measurement to complete measurement of the secondary output voltage of the detected dc voltage transformer, and the error calculation module 02 calculates the error of the detected dc voltage transformer by comparing the error with the standard value of the dc voltage source.
In one embodiment, the AD sampling measurement is to convert an analog voltage signal of the secondary output of the dc voltage transformer to be detected into a digital signal with high accuracy. The secondary output voltage signal of the detected direct current transformer is conditioned and converted through the front-end conditioning circuit 04, and is sent to AD sampling measurement for conversion into a digital value, so that transmission and calculation are facilitated; the AD sampling chip adopts TI ADS1278, has 24bit resolution, and has a sampling rate as high as 52kSPS, and 8 AD sampling channels.
In a specific embodiment, the human-computer interaction module 01 is composed of an industrial personal computer, a TFT liquid crystal display, a mouse, a keyboard and other common input and display devices, the devices operate a windows operating system, and control software of the system operates on the industrial personal computer to complete setting of calibration parameters and reading and processing of measurement data and provide a calibration result.
In a second aspect:
referring to fig. 3, an embodiment of the present invention further provides a method for checking a dc voltage transformer, including:
s10, the man-machine interaction module sends the output parameters of the standard voltage source and the control command to the error calculation module;
s20, the error calculation module controls the standard voltage source 03 to output a first voltage value according to the output parameter and the control command;
s30, the standard voltage source inputs the first voltage value to the detected direct current voltage transformer so that the detected direct current voltage transformer outputs a corresponding voltage signal;
s40, converting the voltage signal by a front-end conditioning circuit to obtain a conversion signal;
s50, the AD sampling measurement module calculates a second voltage value corresponding to the conversion signal and sends the second voltage value to the error calculation module;
and S60, the error calculation module calculates the error of the detected direct current voltage transformer according to the difference value between the first voltage value and the second voltage value.
It should be noted that, the specific steps of implementing the verification process in this embodiment are shown in fig. 4, and include:
the first step is as follows: a user controls upper-layer software, sets the output parameter of the standard voltage source 03 to be UN, does not overlap harmonic waves, and sends the output parameter and a control command of the standard voltage source 03 to the error calculation module 02 through serial port communication by the man-machine interaction module 01;
the second step is that: the error calculation module 02 sets and controls the standard voltage source 03 to output a corresponding output voltage value;
the third step: the standard voltage source 03 is used for measuring the primary application of the detected direct current voltage transformer through the standard voltage output port 06;
the fourth step: the secondary output of the detected direct current voltage transformer is input into the calibrator through a detected voltage input port 07, and AD sampling measurement is carried out through a front-end conditioning circuit 04;
the fifth step: the AD sampling measurement module 05 samples and calculates the magnitude of a secondary output voltage signal of the detected direct current voltage transformer, the error calculation module 02 reads the data of the AD sampling measurement module 05, compares the data with the set output value of the standard voltage source 03, and calculates the error of the detected direct current voltage transformer;
and a sixth step: the man-machine interaction module 01 reads the verification error of the detected direct-current voltage transformer in the error calculation module 02, judges whether the frequency performance verification of the working point is finished or not, modifies the harmonic frequency if the verification is not finished, repeats the steps and conducts the verification of the next frequency point; if the verification is finished, judging whether the measurement and frequency performance verification of all working points of the detected mutual inductor are finished, if not, modifying the voltage of the working points, repeating the steps and verifying the next working point; and if the verification is finished, finishing the verification.
The method for checking the direct current voltage transformer provided by the embodiment of the invention can finish the metering and frequency performance checking of the direct current voltage transformer to be checked through one device, and solves the problems that the metering and frequency experiment checking of the direct current voltage transformer needs more devices, the volume is large, the wiring is complex, the requirement on operators is high, the use is complicated, and the checking efficiency is low.
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 are caused to implement the method for verifying a dc voltage transformer 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 direct current voltage transformer checking method. 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 verifying the dc voltage transformer according to any 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 a dc voltage transformer as described in any one of the above embodiments. For example, the computer readable storage medium may be the above memory including program instructions, and the above program instructions may be executed by a processor of a terminal device to perform the method for verifying a dc voltage transformer according to any of the above embodiments, and achieve the technical effects consistent with the above 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. The utility model provides a direct current voltage transformer check gauge which characterized in that includes:
the human-computer interaction module is used for sending the output parameters and the control commands of the standard voltage source to the error calculation module;
the error calculation module is used for controlling the standard voltage source to output a first voltage value according to the output parameter and the control command;
the standard voltage source is used for inputting the first voltage value to a detected direct current voltage transformer so that the detected direct current voltage transformer outputs a corresponding voltage signal;
the front-end conditioning circuit is used for converting the voltage signal to obtain a conversion signal;
the AD sampling measurement module is used for calculating a second voltage value corresponding to the conversion signal and sending the second voltage value to the error calculation module;
and the error calculation module is further used for calculating the error of the detected direct current voltage transformer according to the difference value between the first voltage value and the second voltage value.
2. The direct-current voltage transformer calibrator according to claim 1, wherein the standard voltage source is driven in a low-voltage driving high-voltage mode, and the output voltage threshold is 1200V;
the standard voltage source is also used for outputting any ripple waves of direct current and direct current superposition within 0-3 kHz.
3. The dc voltage transformer calibrator according to claim 1, wherein the reference voltage source inputs the first voltage value to the dc voltage transformer to be calibrated through a reference voltage output port;
and the detected direct current voltage transformer transmits the voltage signal to the front-end conditioning circuit through a detected voltage input port.
4. The dc voltage transformer calibrator according to claim 1, wherein the first voltage value is applied to a primary side of the dc voltage transformer to be calibrated; and the detected direct current voltage transformer outputs the voltage signal through a secondary side.
5. The dc voltage transformer calibrator according to claim 1, wherein the human-computer interaction module comprises a display screen and a touch screen.
6. The dc voltage transformer calibrator according to claim 1, wherein the human-computer interaction module is further configured to calibrate frequency performance of the dc voltage transformer to be calibrated at different voltages.
7. The direct-current voltage transformer calibrator according to claim 1, wherein a chip adopted by the AD sampling measurement module is ADS 1278.
8. A method for verifying a direct current voltage transformer is characterized by comprising the following steps:
the man-machine interaction module sends the output parameters of the standard voltage source and the control command to the error calculation module;
the error calculation module controls the standard voltage source to output a first voltage value according to the output parameter and the control command;
the standard voltage source inputs the first voltage value to a detected direct current voltage transformer so that the detected direct current voltage transformer outputs a corresponding voltage signal;
the front-end conditioning circuit converts the voltage signal to obtain a conversion signal;
the AD sampling measurement module calculates a second voltage value corresponding to the conversion signal and sends the second voltage value to the error calculation module;
and the error calculation module calculates the error of the detected direct current voltage transformer according to the difference value of the first voltage value and the second voltage value.
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 verifying a dc voltage transformer of claim 7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program is executed by a processor to implement the method of verifying a direct current voltage transformer according to claim 7.
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