CN108776245B - Calibrating device capable of automatically calibrating transformer calibrator with multiple principles - Google Patents
Calibrating device capable of automatically calibrating transformer calibrator with multiple principles Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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- G—PHYSICS
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- G—PHYSICS
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Abstract
The invention discloses a calibrating device capable of automatically calibrating a plurality of principle transformer calibration instruments, which comprises: the system comprises an embedded software and hardware system, an automatic control system, a signal sampling system, an FPGA module, an amplitude-adjustable value phase adjustment circuit, a signal amplifying circuit, a voltage-to-current module, a boost transformer, an up-current transformer, a plurality of voltage transformers, a plurality of current transformers, an isolation module, a polar coordinate system conversion module and a current-to-voltage module; the calibration device solves the defects of the existing calibration device of the transformer calibrator, solves the problems that the conventional device generates orthogonal component signals through a 90-degree phase shifter, generates additional errors and nonlinearity during frequency adjustment, and has higher output precision.
Description
Technical Field
The invention relates to the field of calibrating devices, in particular to a calibrating device capable of automatically calibrating a transformer calibrator with various principles.
Background
At present, tens of thousands of mutual inductor check meters are in use at home, and according to the requirements of the rule of metering law implementation, the mutual inductor check meters must be subjected to periodic verification. The provincial metering court and the electric court in China bear the magnitude transmission of all transformer checkmeters and the first bid verification, and the workload is very large. At present, a traditional transformer calibrator calibrating device based on an alternating current proportion standard is used, different ratio differences and angle differences are directly output by adjusting in-phase and quadrature dials, and the accuracy basically reaches 0.2 level. Because of the lack of automation and informatization means for manual operation, it is gradually being phased out by the new generation of various digitizers.
With the economic development of the country and the advancement of technology, more new high-technology equipment such as an electronic transformer calibrator and a secondary voltage drop are put into use. The new equipment encounters a plurality of new problems when the traditional transformer verification device is used for verification and tracing.
At present, manufacturers in China develop an automatic transformer calibrator calibrating device, but the following problems exist: (1) Because the in-phase component signals are shifted by 90 degrees through the analog phase shifter to generate quadrature component signals, when the frequency of an output source is changed, the 90-degree analog phase shifter changes the phase, and the accuracy of output is affected, so that the output is fixed-frequency output, the requirements of verification regulations cannot be met, (2) the design that the output has no high-accuracy measurement feedback and adjustment output is met, the technical index is met by debugging in factory, the stability in use cannot be checked, and the stability of the device can only be checked in period verification and by adopting other methods. (3) The generation of deltau and deltai of all the current used transformer calibrator calibrating devices depends on that the phase of one path of signal is consistent with the phase of U and I to generate an in-phase component signal, the other path of signal is used for shifting the phase of the in-phase component signal by 90 degrees through a phase shifter to generate a quadrature component signal, and the quadrature component signal is output through an adder in a superposition way and then is output through an isolation transformer. In the generation model, when one of the two signals of the in-phase component or the quadrature component is small, the sine value of the included angle between the two signals of the in-phase component and the quadrature component is approximate to the angle value of the included angle, and at the moment, the traditional transformer calibrator calibrates the traditional transformer calibrator, the secondary voltage drop and the electronic transformer calibrator to obtain ideal calibration data. However, when the in-phase component and the quadrature component are both large, the included angle between them is not approximately equal to the sine value of the included angle between them, the larger the included angle is, the larger the difference is, and the difference is nonlinear, so that the two signals cannot be used for verifying a voltage drop tester and an electronic transformer calibrator of a direct measurement method.
Disclosure of Invention
The invention provides a calibrating device capable of automatically calibrating a transformer calibrator with various principles, solves the defects of the existing transformer calibrator calibrating device, solves the problems of the existing device that the device generates orthogonal component signals through a 90-degree phase shifter, generates additional errors and nonlinearity during frequency adjustment, and has higher output precision.
In order to achieve the aim of the invention, the application provides a calibrating device capable of simultaneously calibrating a traditional transformer calibrator, a secondary voltage drop tester and an electronic transformer calibrator.
The device is a measurement and control device which adopts a modern measurement control technology to realize high automation degree, high integration level, high accuracy and high stability, and the device consists of a LINUX embedded software and hardware system, an automatic control system, a high accuracy AD sampling measurement feedback module, a plurality of precise voltage transformers, a plurality of precise current transformers, a rectangular coordinate system, a polar coordinate system conversion software module, a communication interface and protocol conversion module, an electro-optical conversion module and the like.
The apparatus is provided with a differential pressure (Deltau) and differential flow (Deltoi) generation model: two-sign voltage (U) is generated by digital synthesis and regulation 1 ) And standard current (I) 1 ) The signal simulates the output signal of a standard transformer in the actual verification to generate two paths of tested voltages (U 2 ) And the current to be tested (I 2 ) The signal simulates the output signal of the detected transformer in actual verification, and differential pressure (delta u) and differential flow (delta i) signals are generated according to the wiring of the conventional verification transformer.
The device obtains U by calculating the ratio difference and the angle difference according to the set value output by the set ratio difference and the angle difference 2 And U 1 ，I 2 And I 1 The included angle between the two angles is used for determining the phase shift code values required by delta U and delta i, and then the ratio difference and the angle difference are calculated to be equal to U 1 And I 1 Is used for determining U 2 And I 2 Amplitude and phase of U 1 、I 1 、U 2 And I 2 The amplitude and the phase of the waveform are generated by independent digital synthesized waveforms, so that the problem that the output accuracy is affected by nonlinear errors and adjusting frequencies when the phase is large is solved.
The device adopts a high-resolution phase adjustment technology. In order to meet the high-resolution phase adjustment of 10 < -7 >, the phase adjustment technology is adopted by adjusting the amplitude of the horizontal component and the quadrature component, the two paths of alternating current reference signals of the horizontal component A and the quadrature component B are respectively changed into the two paths of alternating current reference signals of the horizontal component A and the quadrature component B through a D/A conversion channel by a data bus through a high-speed optical coupling isolation system, the amplitude adjustment and the phase adjustment are carried out on the two paths of signals AB, and then the two paths of signals are subjected to the power amplification circuit and the voltage-to-current conversion circuit, so that the proper high-precision mutual inductor isolation output is switched by an output range control module.
The device adopts a high-accuracy measurement feedback technology. U of output 1 And U 2 ，I 1 And I 2 The current-to-voltage circuit is sent to an AD (analog-to-digital) adoption module, the Fourier technology is utilized to calculate the actual output ratio difference value and angle difference value, the data is fed back to the microprocessor, the output is regulated, and the measuring result of the dial indicator is used for carrying out the amplitude value of the working sourceIs better than 10 in adjusting resolution -7 . The result of the ratio difference and the angle difference is used for adjusting the amplitude and the phase of a difference source, and the amplitude adjustment resolution is better than 10 -7 The phase adjustment resolution is better than 0.0001 minutes, the amplitude accuracy of the output of the working source is better than 0.02 percent, the amplitude accuracy of the output of the difference source is better than 0.02 percent and the phase accuracy is better than 0.05 minutes. The accuracy of 0.1% of the overall output is ensured.
The device adopts rectangular coordinate system and polar coordinate system conversion to effectively meet the accuracy transmission requirement of instruments designed under two different coordinate systems. When the traditional transformer calibrator is calibrated, the rectangular coordinate system is adopted for output, and when the voltage drop tester and the electronic transformer calibrator of the direct measurement method are calibrated, the polar coordinate system is adopted for output.
The invention can verify the traditional transformer calibrator, the voltage drop tester and the electronic transformer calibrator, and the configured protocol converter supports IEC61850-9-2LE and FT3 protocols and supports verification of the digital input electronic transformer calibrator. 485, USB and RS232 interfaces are configured to support data access of the transformer calibrator, and verification of the transformer calibrator can be automatically completed after a computer configures error test points.
Compared with the prior art, the invention has the beneficial effects that:
1. adopting new generation model of delta U and delta i and FPGA technology to design digital program control signal source with precise adjustable double-channel amplitude and phase, and U generated by two synchronous digital signals 1 And U 2 The frequency of (2) can be synchronously adjusted, and the problem that the conventional device is produced by a 90-degree phase shifter is solved. Generating quadrature component signals, additional errors and non-linearities are created during frequency adjustment.
2. The problems of stability, accuracy and object adaptability of the device output are solved by adopting a high-resolution phase adjustment technology and an automatic measurement feedback compensation technology, and the amplitude adjustment resolution is better than 10 -7 The phase adjustment resolution is better than 0.0001 minutes, the amplitude accuracy of the output of the working source is better than 0.02 percent, the amplitude accuracy of the output of the difference source is better than 0.02 percent and the phase accuracy is better than 0.05 minutes. Ensure the accuracy of 0.1% of the overall output. Reaching the highest level in China.
3. The accuracy transmission requirements of instruments designed under two different coordinate systems can be effectively met by adopting rectangular coordinate system and polar coordinate system conversion. One device can verify the traditional transformer calibrator, the voltage drop tester and the electronic transformer calibrator, so that the purchase cost of the device is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principle of the invention;
FIG. 1 is a schematic diagram of a system of devices;
FIG. 2 is a schematic block diagram of signal source amplitude modulation;
FIG. 3 is a schematic block diagram of amplitude and phase adjustment of an information source;
FIG. 4 is a diagram of a conventional transformer calibrator voltage error verification wiring;
FIG. 5 is a current error verification wiring diagram of a conventional transformer calibrator;
FIG. 6 is a diagram of voltage error verification wiring of an analog input electronic transformer calibrator;
FIG. 7 is a diagram of a voltage error verification wiring of the digital input electronic transformer calibrator;
FIG. 8 is a diagram of a current error verification wiring of an analog input electronic transformer calibrator;
fig. 9 is a diagram of current error verification wiring of the digital input electronic transformer calibrator.
Detailed Description
The invention provides a calibrating device capable of automatically calibrating a transformer calibrator with various principles, solves the defects of the existing transformer calibrator calibrating device, solves the problems of the existing device that the device generates orthogonal component signals through a 90-degree phase shifter, generates additional errors and nonlinearity during frequency adjustment, and has higher output precision.
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present application and the features in the embodiments may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than within the scope of the description, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
Referring to fig. 1-9, the present application provides an calibrating apparatus for automatically calibrating a transformer calibrator with multiple principles, the principles are shown in fig. 1, including: the system comprises a LINUX embedded software and hardware system, an automatic control system, an FPGA module, a high-resolution amplitude modulation value phase adjustment circuit and signal amplification circuit, an AD sampling measurement feedback module, a voltage-to-current conversion module, a power module, a plurality of precision voltage transformers, a plurality of precision current transformers, an output range switching module, a high-speed optocoupler isolation system, a rectangular coordinate system, a polar coordinate system software conversion module, a communication interface module, an electro-optic conversion module, a protocol conversion module and the like.
The LINUX embedded software and hardware system output end is connected with one input end of the automatic control system; the FPGA module is connected with the automatic control system through a data bus; the AD sampling module is connected with the FPGA module through a data bus; the power module supplies power to all other systems. The method comprises the steps of acquiring information such as a ratio angle difference and a dial indicator value of a detected instrument through an embedded liquid crystal display system, generating two paths of alternating current reference voltage signals with phase relation by an automatic control system through data processing according to the arrangement of a rectangular coordinate system and a polar coordinate system, changing the amplitude of the two paths of alternating current reference voltage signals through an amplitude-adjustable circuit, outputting the two paths of transmitted signals to detected equipment through a power amplifier circuit, a booster transformer, a precision voltage transformer, a voltage-to-current module, a current-to-current transformer and a precision current transformer through control signals of the automatic control system, transmitting data obtained by sampling the phase amplitude of the two paths of signals through an isolation module and a current-to-voltage circuit to the automatic control system for processing, and displaying an actual output result by the embedded liquid crystal display system after the processed data, and automatically printing verification original records and certificates.
The working source and difference source generating principle of the invention is as follows: generating a two-level sign voltage (U) by digital synthesis and regulation 1 ) And standard current (I) 1 ) The signal simulates the output signal of a standard transformer in the actual verification to generate two paths of tested voltage (U 2 ) And the current to be tested (I 2 ) The signal simulates the output signal of the detected transformer in actual verification, and differential pressure (delta u) and differential flow (delta i) signals are generated according to the wiring of the conventional verification transformer.
Obtaining U by calculating the ratio difference and the angle difference according to the set value output by the set ratio difference and the angle difference 2 And U 1 ,I 2 And I 1 The included angle between the two angles is used for determining the phase shift code values required by delta U and delta i, and then the ratio difference and the angle difference are calculated to be equal to U 1 And I 1 Is used for determining U 2 And I 2 Amplitude and phase of U 1 、I 1 、U 2 And I 2 The amplitude and the phase of the waveform are generated by independent digital synthesized waveforms, so that the problem that the output accuracy is affected by nonlinear errors and adjusting frequencies when the phase is large is solved.
The outputs of the working source and the difference source are connected with a real-time measuring circuit, the measuring result is fed back to a CPU (stm 32), and the control values of the amplitude and the phase are adjusted according to the difference value with the set value, so that the accuracy of the source output is ensured.
The invention further adopts a high-resolution amplitude-adjustable value circuit and a signal amplifying circuit, the principle is as shown in figure 2, analog signals are added by using B (16-bit D/A) and E (12-bit D/A), the analog signals are provided for reference voltage of C (16-bit D/A) of waveform synthesis, and the FPGA generates waveform data to C through a parallel bus, so that the amplitude adjustment resolution of a signal source is ensured to be better than 10 -7 。
The invention further adopts a high-resolution adjustable phase modulation circuit and a signal amplification circuit, the principle is as shown in figure 3, firstly, the high-resolution adjustable phase modulation circuit and the signal amplification circuit are utilized to generate 2 amplitude adjustable horizontal components and quadrature components which are used as reference voltages of B (24-bit D/A) and D (24-bit D/A), amplitude adjustment data are generated for B and D through an FPGA parallel bus, and a high-resolution phase adjustable difference signal is synthesized through an analog adder C. The 2 magnitudes are calculated as follows:
the mathematical expression of the signal is assumed to be:
U 2 ＝U m2 cos(ωt+θ) (1)
the trigonometric function is developed to obtain:
U 2 ＝U m2 cosωt cosθ-U m2 sinωt sinθ (2)
let a=cos θb= -sin θ, bring into formula (2) to obtain:
U 2 ＝AU m2 cosωt+BU m2 sinωt (3)
the initial phase is:
θ＝π-arctg(B/A) (4)
a and B satisfy the following relationship
A 2 +B 2 ＝1 (5)
Thus, the values of A and B are adjusted by the circuit shown in FIG. 3 to obtain a high precision phase-adjustable signal U2.
The real-time measurement feedback compensation technology adopted by the invention further comprises a certain number of high-accuracy voltage, current transformers and IO ports, the real-time measurement feedback compensation technology comprises a channel selector, a program-controlled amplifier and a high-accuracy AD conversion chip which are sequentially connected, the real-time measurement feedback compensation technology is connected with the FPGA module through a data bus, the A/D value calculates the actual output ratio difference value and angle difference value through the Fourier technology, data are fed back to the microprocessor, the working source measurement result is used for adjusting the working source amplitude value, the comparison difference value and angle difference result is used for adjusting the amplitude value and the phase position of the difference source, and the long-term stability and the object adaptability are greatly improved. Amplitude modulation resolution is better than 10 -7 The phase adjustment resolution is better than 0.0001 minutes, the amplitude accuracy of the output of the working source is better than 0.02 percent, the amplitude accuracy of the output of the difference source is better than 0.02 percent and the phase accuracy is better than 0.05 minutes. The accuracy of 0.1% of the overall output is ensured.
The invention further adopts the rectangular coordinate system and the polar coordinate system to realize the conversion of the transformer calibrator for calibrating different principles, and adopts the rectangular coordinate system for output when calibrating the traditional transformer calibrator, and adopts the polar coordinate system for output when calibrating the wireless voltage drop tester and the electronic transformer calibrator of the direct measurement method.
(1) Checking traditional transformer calibrator adopting rectangular coordinate system output source
Under the condition of the voltage transformer test function, the standard voltage is U1, the differential voltage is delta U, the ratio difference is f (%),
the angular difference is delta ('), and the amplitude difference output by the two signal sources should satisfy:
the phase difference of the two signal sources should satisfy:
(2) Wireless voltage drop tester for calibrating power by adopting polar coordinate system output source and electronic transformer calibrator
Generating a standard AC voltage signal U using a polar coordinate system 1 ＝U m1 cos (ωt), and standard AC voltage signal U 1 Synchronous proportional phase-out differential voltage signal U 2 ＝U 1 +ΔU＝U m2 cos(ωt+θ)。
The calibrating device provided by the invention adopts two paths of mutually independent analog signal output with adjustable phase amplitude, has the advantages of simple circuit, low fault rate, high accuracy, good stability and wide application range, and can effectively meet the accuracy transmission requirements of instruments designed under two different coordinate systems.
The specific use method of the invention is as follows. When the voltage error of the traditional transformer calibrator is detected, the a2 and a1 output by the invention are short-circuited, the n1 and n2 terminals are connected to the K, D terminal of the traditional transformer calibrator, and the standard voltage signals a1 and n1 terminals are connected to the A, X terminal of the traditional transformer calibrator, so that the voltage error of the traditional transformer calibrator is detected.
When the current error of the conventional transformer calibrator is detected, the polarity ends K1 and s1 of the standard current and the tested current are short-circuited, the formed differential current is connected to the K terminal of the conventional transformer calibrator from K1, and the nonpolar terminals K2 and s2 of the standard current and the tested current are connected to the T terminal of the conventional transformer calibrator 0 、T x And the terminal is used for realizing the verification of the current error of the traditional transformer calibrator. The wiring principle of the secondary voltage drop tester during verification is consistent with that of the traditional transformer calibrator.
The tested signal channel of the electronic transformer calibrator is generally divided into digital input and analog input. When the analog input electronic transformer calibrator is detected, the tested signal output by the invention is connected into the analog input channel of the electronic transformer calibrator, and the standard signal output by the invention is connected into the standard input channel of the electronic transformer calibrator, so that the verification of the electronic transformer calibrator with small analog input is realized.
The digital quantity input channel generally supports an IEC61850-9-2LE or FT3 protocol optical signal, so that when the digital quantity input electronic transformer calibrator is detected, an FPGA can be utilized to directly generate a path of digital signal, and a protocol conversion device and an electro-optical conversion device are utilized to convert the tested signal into an optical signal conforming to the IEC61850-9-2LE or FT3 protocol, thereby realizing the verification of the digital quantity input electronic transformer calibrator.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An assay device for automatically calibrating a multi-principle transformer calibrator, the device comprising:
the system comprises an embedded software and hardware system, an automatic control system, a signal sampling system, an FPGA module, an amplitude-adjustable value phase adjustment circuit, a signal amplifying circuit, a voltage-to-current module, a boost transformer, an up-current transformer, a plurality of voltage transformers, a plurality of current transformers, an isolation module, a polar coordinate system conversion module and a current-to-voltage module;
the method comprises the steps of acquiring the information of the differential angle difference and the dial indicator value of a checked transformer calibrator through an embedded software and hardware system, generating two paths of alternating current reference voltage signals with phase relation by an automatic control system through data processing based on a rectangular coordinate system and a polar coordinate system, changing the amplitude of the two paths of alternating current reference voltage signals through an amplitude-adjustable phase adjusting circuit, outputting the two paths of signals to the checked transformer calibrator after the two paths of signals are transmitted through a signal amplifying circuit, a voltage boosting transformer, a voltage-to-current module, a current-to-current transformer and a current-transformer by a control signal of the automatic control system, and transmitting the data obtained by sampling the phase amplitude of the two paths of signals through an isolation module and the current-to-voltage module to the automatic control system for processing, wherein the processed data are output verification results by the embedded software and hardware system.
2. The device for automatically calibrating a multi-principle transformer calibrator according to claim 1, wherein the device generates a two-standard reference voltage U by digital synthesis and adjustment 1 And standard current I 1 The signal simulates the output signal of a standard transformer in actual verification to generate two paths of tested voltage U 2 And a current under test I 2 The signal simulates the output signal of the detected transformer in actual verification, and the differential pressure delta u and differential flow delta i signals are generated according to the wiring of the conventional verification transformer.
3. The device for automatically calibrating a multi-principle transformer calibrator according to claim 1, wherein the device comprisesObtaining U by calculating the ratio difference and the angle difference according to the set value output by the set ratio difference and the angle difference 2 And U 1 ,I 2 And I 1 The included angle between the two angles is used for determining the phase shift code values required by delta U and delta i, and then the ratio difference and the angle difference are calculated to be equal to U 1 And I 1 Is used for determining U 2 And I 2 Amplitude and phase of U 1 、I 1 、U 2 And I 2 Is generated from separate digital composite waveforms.
4. The calibrating device capable of automatically calibrating the transformer calibrator according to the multiple principles of claim 1, wherein the outputs of the working source and the difference source of the device are connected with a real-time measuring circuit, the measuring result is fed back to the FPGA module, and the control values of the amplitude and the phase are adjusted according to the difference value from the set value.
5. The calibrating device for automatically calibrating the transformer calibrator with multiple principles according to claim 1, wherein the calibrating device adjusts the phase by adjusting the amplitude of horizontal component and orthogonal component, changes two paths of alternating reference signals of horizontal component A and orthogonal component B through a D/A conversion channel respectively through a data bus by an optocoupler isolation system, adjusts the amplitude of two paths of signals AB, adjusts the phase, and switches proper high-precision transformer isolation output through a power amplifier circuit and a voltage-to-current circuit by an output range control module.
6. The device for automatically calibrating a multi-principle transformer calibrator according to claim 3, wherein the output U of the device 1 And U 2 ，I 1 And I 2 The current-to-voltage module is sent to the AD adoption module, the ratio difference value and the angle difference value which are actually output are calculated by utilizing a Fourier algorithm, data are fed back to the microprocessor, the output is regulated, and the measuring result of the dial indicator is used for adjusting the amplitude of the working source; the results of the ratio and angle differences are used to adjust the amplitude and phase of the difference source.
7. The apparatus for automatically calibrating a multi-principle transformer calibrator according to claim 1, wherein the FPGA module comprises: the system comprises an IO port, a UART serial port, a 40M active crystal oscillator, a digital-to-analog conversion circuit and a direct-current voltage reference chip, wherein an FPGA module respectively generates 3 paths of alternating-current reference voltage waveforms with adjustable frequency, amplitude and phase, one path of the waveforms is used for generating standard voltage and current, and the other two paths of waveforms are used for generating horizontal components and orthogonal components for adjusting the phase.
8. The calibrating device for automatically calibrating the transformer calibrator according to the multiple principles of claim 1, wherein the amplitude-adjustable value phase adjusting circuit and the signal amplifying circuit generate 2 amplitude-adjustable horizontal components and quadrature components as reference voltages of digital-to-analog conversion B and digital-to-analog conversion D, generate amplitude adjustment data to the digital-to-analog conversion B and the digital-to-analog conversion D through an FPGA parallel bus, and synthesize a phase-adjustable difference signal through an analog adder C; the 2 magnitudes are calculated as follows:
the mathematical expression of the signal is assumed to be:
U 2 ＝U m2 cos(ωt+θ) (1)
the trigonometric function is developed to obtain:
U 2 ＝U m2 cosωtcosθ-U m2 sinωtsinθ (2)
let a=cos θb= -sin θ, bring into formula (2) to obtain:
U 2 ＝AU m2 cosωt+BU m2 sinωt (3)
the initial phase is:
θ＝π-arctg(B/A) (4)
a and B satisfy the following relationship:
A 2 +B 2 ＝1 (5)
wherein U is m2 Is the amplitude of the signal, ω is the angular frequency, θ is the initial phase angle.
9. The calibrating device capable of automatically calibrating the transformer calibrator according to the multiple principles of claim 1, wherein the device is provided with a voltage transformer, a current transformer and an IO port, a channel selector, a program controlled amplifier and an AD conversion chip which are connected in sequence are connected with an FPGA module through a data bus, an A/D value calculates a ratio difference value and an angle difference value which are actually output through a Fourier algorithm, feedback data to the FPGA module, a working source measurement result is used for adjusting the amplitude of the working source, and the results of the ratio difference value and the angle difference value are used for adjusting the amplitude and the phase of a difference source.
10. The calibrating device capable of automatically calibrating the transformer calibrator with multiple principles according to claim 1, wherein the calibrating device adopts a rectangular coordinate system and a polar coordinate system to convert to realize calibrating the transformer calibrator with different principles, and the calibrating device adopts the rectangular coordinate system to output when calibrating the traditional transformer calibrator, and adopts the polar coordinate system to output when calibrating the wireless voltage drop tester and the electronic transformer calibrator of the direct measurement method;
and (3) calibrating a traditional transformer calibrator by adopting a rectangular coordinate system output source:
under the condition of the voltage transformer test function, the amplitude difference of the output of the two signal sources is assumed to satisfy the following conditions:
the phase difference of the two signal sources satisfies:
wherein U is 1 The voltage is a standard voltage amplitude, delta U is a difference voltage amplitude, f (%) is a ratio difference, delta (') is an angle difference;
the method comprises the steps of adopting a polar coordinate system output source verification power wireless pressure drop tester and an electronic transformer calibrator:
generating a standard AC voltage signal U using a polar coordinate system 1 ＝U m1 cos (ωt), and standard AC voltage signal U 1 Synchronous proportional phase-out test voltage signalNumber U 2 ＝U 1 +ΔU＝U m2 cos(ωt+θ)。
Priority Applications (1)
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| CN110596633A (en) * | 2019-10-16 | 2019-12-20 | 上海市计量测试技术研究院 | Calibration system and calibration method of analog input type electronic transformer calibrator |
| CN110850353A (en) * | 2019-12-13 | 2020-02-28 | 国网湖北省电力有限公司计量中心 | Calibration method of instrument checking device of mutual inductor |
| CN111487576B (en) * | 2020-04-30 | 2022-12-30 | 浙江省计量科学研究院 | Miniature current transformer measuring device based on direct measurement method |
| CN114325058A (en) * | 2022-01-06 | 2022-04-12 | 北京东方计量测试研究所 | AC voltage calibration device and method |
| CN114814704B (en) * | 2022-04-15 | 2024-08-02 | 中国计量科学研究院 | Error compensation method for standard voltage transformer |
| CN116577536B (en) * | 2023-07-10 | 2023-09-15 | 烟台东方威思顿电气有限公司 | Three-phase alternating current standard source based on waveform-amplitude separation control |
| CN117310240B (en) * | 2023-11-30 | 2024-02-09 | 国网山西省电力公司营销服务中心 | Signal source generation system and method for calibrating device of transformer calibrator |
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