CN210347905U - System for be used for carrying out whole system of examining to direct current transformer check gauge - Google Patents
System for be used for carrying out whole system of examining to direct current transformer check gauge Download PDFInfo
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Abstract
The utility model discloses a system for be used for carrying out whole examining to direct current transformer check gauge: the system comprises a standard analog source unit, an analog differential unit, a high-precision analog acquisition unit, a standard digital source unit and a clock synchronization unit; the standard analog source unit outputs a standard direct current analog signal; the analog differential unit superposes the standard direct current analog signal on the differential direct current signal through a superposition technology to generate a differential analog signal; the high-precision analog acquisition unit acquires a differential analog signal, converts the differential analog signal into a digital differential signal and inputs the digital differential signal into a standard digital source unit; the clock synchronization unit provides clock synchronization signals for the checked direct current transformer calibrator and the high-precision analog acquisition unit through the clock synchronization unit of the standard digital source unit; and the standard digital source unit encodes the digital differential signal and converts the digital differential signal into a digital message, and the digital message is input into the checked direct current transformer calibrator.
Description
Technical Field
The utility model relates to a direct current transformer check-up technical field, more specifically relates to a system for be used for carrying out whole examining to direct current transformer check gauge.
Background
The direct current transformer is used as important primary equipment for construction and operation of a direct current power transmission system, accurate and reliable measurement information is provided for control protection and stable operation of the system, and the operation reliability and the measurement accuracy of the direct current transformer are directly related to safe and stable operation of the direct current power transmission system. In recent years, the application of the direct current transformer is more and more extensive, the requirement of field test is more and more obvious and urgent, and the direct current transformer calibrator is also widely applied as important equipment for calibration test of the direct current transformer. At present, more and more manufacturers of units research on the direct current transformer check gauge, various direct current transformer check gauges appear on the market, the direct current transformer check gauges have an integral structure and a split structure, products are different, domestic test equipment manufacturers successively release check equipment with an electronic direct current transformer calibration function, and the accuracy of the check equipment reaches 0.05 level. Through test comparison, the data detected by the direct current transformer check meters of different manufacturers have large difference, in addition, most of the calibration certificates of the direct current transformer check meters only have alternating current calibration data and are not calibrated aiming at the direct current check function, and the calibration test of the direct current check function of the direct current transformer check meter is not carried out at present mainly because the whole check equipment and the whole check technology of the direct current transformer check meter are lacked. Partial manufacturers send partial modules of the direct current transformer check meter to be checked independently, direct current transformer check meters developed by most of the manufacturers carry out direct current transformer detection service on site without calibration detection tests, detection data reliability is poor, and threats and hidden dangers are brought to safe and stable operation of a direct current transmission system.
At present, research on the whole inspection technology of the mutual inductor calibrator at home and abroad is gradually increased, but mainly aims at the aspect of the calibration technology of the mutual inductor calibrator in the alternating current field, the research on the whole inspection technology of the direct current mutual inductor calibrator is less, and domestic research institutions engaged in the direct current mutual inductor calibration technology and the magnitude traceability technology are mainly China institute of electrical power science, and at present, scientific research related to the calibration and magnitude traceability of the direct current mutual inductor calibrator is actively carried out.
In the prior art (application number: 201210436816.X), an electronic transformer calibrator verification device and method based on a digital source adopt a standard digital source which generates a standard IEC61850 data frame based on a linear mathematical method to realize digital quantity traceability of the electronic transformer calibrator, and standard digital source signals can be output synchronously with a standard analog source after being superposed with a ratio difference and an angle difference. In the prior art (application number: 201410187562.1), the calibration device and the calibration method for the electronic transformer harmonic calibrator are based on a mathematical formula method to realize a standard digital source for outputting IEC61850 data frames, and are matched with a harmonic generator which can be traced to national harmonic standards to realize the overall calibration of the electronic transformer harmonic calibrator. In the prior art (application number: 201310106173), a traceability device for an electronic transformer output calibrator realizes digital quantity traceability and overall calibration of the electronic transformer calibrator based on high-precision digital measurement and a differential source superposition technology. In the prior art (application number: 201710796325.9), a full-automatic transformer calibrator overall inspection device and an overall inspection method and (application number: 201712534653.3) a transformer calibration system based on an image recognition technology automatically detects measurement data of a to-be-inspected transformer calibrator based on an image recognition method, so that the overall inspection efficiency of the transformer calibrator is improved.
However, the prior art is directed to the whole inspection of an electronic transformer calibrator or a traditional transformer calibrator in the ac field, and is not suitable for the whole inspection method of a dc transformer calibrator, and the dc transformer calibrator and the ac transformer calibrator are greatly different in terms of the implementation principle and the magnitude tracing method.
Therefore, a technology for performing a calibration of the dc transformer calibrator is needed.
Disclosure of Invention
The utility model provides a system for be used for carrying out whole examining to the direct current transformer check gauge to solve and how to carry out whole problem of examining to the direct current transformer check gauge.
In order to solve the above problem, the utility model provides a system for be used for carrying out whole examining to direct current transformer check gauge, the system includes: the system comprises a standard analog source unit, an analog differential unit, a high-precision analog acquisition unit and a standard digital source unit; wherein the standard math source unit comprises a clock synchronization unit;
the standard analog source unit adopts a high-precision standard calibration current source, outputs a standard direct current analog signal through the high-precision standard calibration current source, and inputs the standard direct current analog signal to the checked direct current transformer calibrator;
the analog differential unit is used for superposing standard direct current analog signals on differential direct current signals through a superposition technology to generate differential analog signals, and the differential analog signals are input to the checked direct current transformer calibrator;
the high-precision analog acquisition unit is used for acquiring the differential analog signal, converting the differential analog signal into a digital differential signal and inputting the digital differential signal into a standard digital source unit;
the clock synchronization unit is used for providing clock synchronization signals for the checked direct current transformer calibrator and the high-precision analog acquisition unit through the clock synchronization unit of the standard digital source unit;
and the standard digital source unit is used for coding and converting the digital differential signal into a digital message and inputting the digital message into the checked direct current transformer calibrator.
Preferably, the standard analog source unit is further configured to: and a Fluke 5730A is adopted as a high-precision standard direct current source and is used for outputting standard direct current analog signals.
Preferably, the analog differential unit is configured to: and superposing the standard direct current analog signal with the differential direct current signal by a superposition technology to generate a differential analog signal, and further used for:
the superposition technology based on the differential superposition unit superposes the standard direct current analog signal with the differential direct current signal with the standard error of +/-0.01% -to +/-1%, and the variation stability of the differential direct current signal reaches 10-5An order of magnitude.
Preferably, the standard digital source unit is configured to: and the digital differential signal is coded and converted into a digital message, and the method is also used for:
the standard digital source unit adopts an FPGA and an embedded dual-processor framework, and converts the differential analog signals into real-time digital messages of an FT3 protocol based on an FT3 real-time digital message coding technology.
Preferably, the standard-passing digital source unit is configured to: and the digital differential signal is coded and converted into a digital message, and the method is also used for:
and the standard digital source unit adopts an FPGA and embedded dual-processor architecture and converts the differential analog signals into real-time digital messages of an ICE61850 protocol based on an ICE61850 real-time digital message coding technology.
The utility model provides a direct current transformer calibrator carries out the whole system of examining, is based on accurate direct current simulation slightly poor stack technique and real-time FT3 digital message encoded standard digital source technique, realizes the whole of examining of direct current transformer calibrator. The technical scheme of the invention adopts a high-precision standard flow source as a standard analog source to realize the tracing of standard analog quantity; realizing a high-resolution high-stability superposed microvolt level simulation differential simulation signal source based on a precise direct current simulation differential superposition technology; the analog signals are encoded into FT3 (or IEC61850) messages by adopting an FT3 (or IEC61850) real-time digital message encoding technology and a high-precision A/D sampling technology based on the FPGA to realize a standard digital source which can be traced to a standard analog source, and a standard high-accuracy digital signal source and a digital signal source with digital differential superposition can be realized by adopting a digital message encoding technology based on the FPGA alone, so that the problem of digital value tracing of a direct-current transformer calibrator is solved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a system block diagram for performing a calibration of a DC transformer calibrator in accordance with a preferred embodiment of the present invention; and
fig. 2 is a schematic diagram of the working principle of the dc transformer calibrator according to the preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a system configuration diagram for performing a calibration of a dc transformer calibrator according to a preferred embodiment of the present invention. As shown in fig. 1, a system for performing overall inspection on a dc transformer calibrator according to an embodiment of the present invention includes a standard analog source unit, an analog differential unit, a high-precision analog acquisition unit, and a standard digital source unit. The standard digital source unit consists of an acquisition control unit, a clock synchronization unit and a coding unit.
Preferably, the standard analog source unit adopts a high-precision standard calibration current source, outputs a standard direct current analog signal through the high-precision standard calibration current source, and inputs the standard direct current analog signal to the checked direct current transformer calibrator. Preferably, the standard analog source unit is further configured to: the high precision standard flow source was output via Fluke 5730A.
Preferably, the analog differential unit is configured to superimpose the standard dc analog signal on the differential dc signal by using a superposition technique to generate a differential analog signal, and input the differential analog signal to the to-be-detected dc transformer calibrator. Preferably, the analog differential unit is configured to: and superposing the standard direct current analog signal with the differential direct current signal by a superposition technology to generate a differential analog signal, and further used for: the superposition technology based on the differential superposition unit superposes the standard direct current analog signal with the differential direct current signal with the standard error of +/-0.01% - +/-1%, and the variation stability of the differential direct current signal reaches 10-5An order of magnitude.
Preferably, the high-precision analog acquisition unit is used for acquiring the differential analog signal, converting the differential analog signal into a digital differential signal and inputting the digital differential signal into the standard digital source unit.
Preferably, the clock synchronization unit is used for providing clock synchronization signals for the checked direct current transformer calibrator and the high-precision analog acquisition unit through the clock synchronization unit of the standard digital source unit.
Preferably, the standard digital source unit is configured to encode the digital differential signal into a digital message, and input the digital message into the to-be-detected dc transformer calibrator.
Preferably, the standard digital source unit is for: the digital differential signal is coded and converted into a digital message, and the method is further used for: the standard digital source unit adopts an FPGA and an embedded dual-processor framework, and converts the differential analog signals into real-time digital messages of an FT3 protocol based on an FT3 real-time digital message coding technology.
Preferably, the standard digital source unit is used for: the digital differential signal is coded and converted into a digital message, and the method is further used for: the standard digital source unit adopts an FPGA and embedded dual-processor architecture, and converts the differential analog signals into real-time digital messages of an ICE61850 protocol based on an ICE61850 real-time digital message coding technology.
The system for carrying out the integral inspection on the direct current transformer calibrator has the main function of realizing error verification and calibration of the direct current transformer calibrator. The verification calibration object of the direct current transformer calibrator can be a direct current transformer of an analog quantity output type and a digital quantity output type. The working principle of the calibration direct current transformer calibrator is that a path of high-precision standard direct current analog signal U is output to a standard analog input port and an analog differential unit of the direct current transformer calibrator to be tested respectively through a standard analog source unit, the analog differential unit superposes a microvolt-level small analog signal (delta U) on the basis of the standard direct current analog signal (U) at the input port and outputs the superposed microvolt-level small analog signal to a tested analog input port and a high-precision analog acquisition unit of the direct current transformer calibrator, the superposed microvolt direct current analog signal (U + delta U) is input to a standard digital source unit after passing through the high-precision analog acquisition unit, and is converted into a direct current FT3 (or) digital signal (U + delta U) after being processed by an acquisition control unit and a coding unit of the standard digital source unit and output to a tested digital input port of the direct current transformer calibrator, in addition, a clock synchronization unit of the standard digital source unit can provide clock synchronization signals for a high-precision analog acquisition unit inside the direct current transformer calibrator and an external tested direct current transformer calibrator. In summary, the direct current transformer calibrator whole-checking device can output three signals to the direct current transformer calibrator to be checked, the three signals are respectively a standard direct current analog signal (U), a direct current analog signal (U + Δ U) superimposed with a differential signal and a direct current digital signal (U + Δ U) superimposed with a differential signal, and the three signals can all realize accurate and reliable magnitude tracing, so that error calibration of the direct current transformer calibrator of an analog output type and a digital output type is realized.
The error detection and calibration function of the direct current transformer calibrator with the analog quantity output type and the digital quantity output type is achieved. When the checked direct current transformer calibrator is of an analog output type, the direct current transformer calibrator outputs a standard direct current analog signal (U) and a direct current analog signal (U + delta U) superposed with a differential signal to a standard analog input port and a measured analog input port of the checked direct current transformer calibrator respectively for analog function calibration of the checked direct current transformer calibrator; when the checked direct current transformer calibrator is in a digital output type, the direct current transformer calibrator outputs a standard direct current analog signal (U) and a direct current digital signal (U + delta U) superposed with a differential signal to a standard analog input port and a measured digital input port of the checked direct current transformer calibrator respectively for digital function calibration of the checked direct current transformer calibrator.
The standard analog source unit provided by the application adopts a high-precision standard current source, the model of the standard analog source unit is Fluke 5730A produced by Fluke corporation, and the standard analog source unit has the functions of mainly outputting a high-precision high-stability standard direct current signal, providing a standard direct current analog signal which can be traced to China institute of metrology science, and ensuring the accuracy and reliability of verification and calibration of a direct current transformer calibrator.
The analog differential unit provided by the application has the main functions of superposing a microvolt small analog deviation signal on the basis of a standard direct current analog signal (U) of an input port and outputting a microvolt small analog signal superposed direct current analog signal. The amplitude (delta U) of a microvolt small analog signal is +/-0.01% - +/-1% of the amplitude of a standard direct-current analog signal of an input port, namely delta U is +/-0.01% -1% U, the microvolt analog signal can be used as a standard error signal (delta U) of a calibration instrument adjustment device of a direct-current transformer, the minimum resolution of output signal adjustment of an analog differential unit is 0.01% of the amplitude of the standard direct-current analog signal, and the stability of the variation reaches 10 percent-5An order of magnitude. Therefore, the effect of the analog differential unit is to superimpose Δ U (± 0.01% to ± 1%) U on the standard dc signal (U) output by the standard analog source unitThe standard error signal is directly output or converted into a digital signal through the high-precision acquisition unit and the standard digital source unit and then output to a measured analog input port of the checked direct current transformer calibrator for error verification and calibration of the direct current transformer calibrator by adopting a direct measurement method, so that the verification and calibration accuracy and reliability of the direct current transformer calibrator are improved.
The high-precision analog acquisition unit adopts a high-precision digital multimeter, the type of the high-precision analog acquisition unit is Agilent 3458A produced by Agilent company, the high-precision analog acquisition unit mainly has the functions of receiving a control signal output by an acquisition control unit of a standard digital source unit and a synchronous pulse trigger signal of a synchronous clock unit, carrying out A/D synchronous trigger sampling on a direct current analog signal of an input port, converting the direct current analog signal into a digital signal and outputting the digital signal to the acquisition control unit of the standard digital source unit, and converting a rear-stage coding unit into an FT3 (or IEC61850) digital message.
The standard digital source unit mainly comprises an acquisition control unit, a clock synchronization unit and a coding unit, wherein the acquisition control unit belongs to a core component of the standard digital source unit, the acquisition control unit is developed based on an FPGA (field programmable gate array) architecture processor and mainly comprises an FPGA core circuit, a GPIB (general purpose interface bus) acquisition control circuit, a memory circuit and other necessary configuration circuits, the clock synchronization unit mainly comprises a frequency division circuit and an electric/optical conversion circuit, and the coding unit is developed based on an embedded architecture processor and mainly comprises an embedded core circuit, a communication protocol circuit and an electric/optical conversion circuit. The standard digital source unit has the main functions of controlling the high-precision analog acquisition unit in real time to perform A/D synchronous sampling and converting digital signals subjected to A/D sampling into FT3 (or IEC61850) digital messages for output. The specific implementation mode is as follows:
(1) a clock synchronization unit of the standard digital source unit generates a 1Hz pulse-per-second synchronization signal through a frequency division circuit, one path of the pulse-per-second synchronization signal is directly output to a high-precision analog acquisition unit and is triggered to carry out A/D sampling at the pulse rising edge moment of the pulse-per-second synchronization signal, and the other path of the pulse-per-second synchronization signal is converted into an optical synchronization signal through an electric/optical conversion circuit and is output to a checked direct current transformer calibrator for synchronous trigger sampling of each input port of the calibrator;
(2) an acquisition control unit of the standard digital source unit sends an A/D sampling instruction to a high-precision analog acquisition unit through an FPGA core circuit and a GPIB acquisition control circuit, the high-precision analog acquisition unit starts to trigger sampling at the pulse rising edge moment of a clock synchronization signal and transmits sampling data to the FPGA core circuit through the GPIB acquisition control circuit, and the FPGA core circuit receives the sampling data and then transmits the sampling data to an encoding unit;
(3) an embedded core circuit of a coding unit of the standard digital source unit receives sampling data transmitted by an FPGA core circuit, the sampling data is coded into FT3 (or IEC61850) digital messages by matching with a communication protocol circuit, FT3 (or IEC61850) digital signals of electric signals are converted into optical digital signals through an electric/optical conversion circuit, and the optical digital signals are output to a measured digital quantity input port of a checked direct current transformer calibrator.
Fig. 2 is a schematic diagram of the working principle of the dc transformer calibrator according to the preferred embodiment of the present invention. As shown in fig. 2, the dc transformer calibrator is an instrument for calibrating a measurement error of a dc transformer, and operates on the principle of receiving a standard signal U and an output U' ═ U + Δ U (which may be an analog or digital output) of the dc transformer to be measured, and then calculating an error of the output with respect to the input.
Suppose that the measured transformation ratio of the measured direct current transformer is 1: 1 (namely, theoretically, the output is equal to the input), but because the measured direct current transformer is inaccurate in measurement and has errors, the output and the input of the direct current transformer are not equal under normal conditions, a small measurement error (namely, delta U) exists, and the direct current transformer calibrator has the function of measuring the measurement error of the measured direct current transformer.
After the direct current transformer calibrator receives the standard signal U and the output U' of the direct current transformer to be measured, which is U + delta U, the measurement error of the direct current transformer to be measured is calculated by using the following formula:
ε＝(U′-U)/U＝ΔU/U
because the direct current transformer calibrator needs to collect a standard signal and an output signal of the measured direct current transformer to calculate a measurement error of the measured direct current transformer, the accuracy level of the direct current transformer calibrator needs to be very high, and the situation that the measurement error of the direct current transformer calibrator is inaccurate can also occur under a common situation, the error of the direct current transformer calibrator needs to be measured.
The effect of the whole device of examining of direct current transformer calibrator that this application provided is exactly to check up the error of direct current transformer calibrator. Therefore, referring to the working principle of the dc transformer calibrator in fig. 2, the dc transformer calibrator needs to provide three sets of very precise and stable signals, namely, one set of standard signal and two sets of output signals (analog quantity and digital quantity). In addition, the calibration of the direct current transformer calibrator involves synchronous acquisition, so that the whole detection device needs to provide a group of clock synchronization signals.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (5)
1. A system for carrying out overall inspection on a direct current transformer calibrator is characterized by comprising: the system comprises a standard analog source unit, an analog differential unit, a high-precision analog acquisition unit and a standard digital source unit; wherein the standard digital source unit comprises a clock synchronization unit;
the standard analog source unit adopts a high-precision standard calibration current source, outputs a standard direct current analog signal through the high-precision standard calibration current source, and inputs the standard direct current analog signal to the checked direct current transformer calibrator;
the analog differential unit is used for superposing standard direct current analog signals on differential direct current signals through a superposition technology to generate differential analog signals, and the differential analog signals are input to the checked direct current transformer calibrator;
the high-precision analog acquisition unit is used for acquiring the differential analog signal, converting the differential analog signal into a digital differential signal and inputting the digital differential signal into a standard digital source unit;
the clock synchronization unit is used for providing clock synchronization signals for the checked direct current transformer calibrator and the high-precision analog acquisition unit through the clock synchronization unit of the standard digital source unit;
and the standard digital source unit is used for coding and converting the digital differential signal into a digital message and inputting the digital message into the checked direct current transformer calibrator.
2. The system for performing integrity checks on a dc transformer prover of claim 1 wherein the standard analog source unit is further configured to: and a Fluke 5730A is adopted as a high-precision standard direct current source to output standard direct current analog signals.
3. The system for performing integrity check on the dc transformer calibrator as recited in claim 1, wherein said analog differential unit is configured to: and superposing the standard direct current analog signal with the differential direct current signal by a superposition technology to generate a differential analog signal, and further used for:
the superposition technology based on the differential superposition unit superposes the standard direct current analog signal with the differential direct current signal with the standard error of +/-0.01% -to +/-1%, and the variation stability of the differential direct current signal reaches 10-5An order of magnitude.
4. The system of claim 1, wherein the standard digital source unit is configured to: and the digital differential signal is coded and converted into a digital message, and the method is also used for:
the standard digital source unit adopts an FPGA and an embedded dual-processor framework, and converts the differential analog signals into real-time digital messages of an FT3 protocol based on an FT3 real-time digital message coding technology.
5. The system of claim 1, wherein the pass-standard digital source unit is configured to: and the digital differential signal is coded and converted into a digital message, and the method is also used for:
and the standard digital source unit adopts an FPGA and embedded dual-processor architecture and converts the differential analog signals into real-time digital messages of an ICE61850 protocol based on an ICE61850 real-time digital message coding technology.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281692A (en) * | 2021-06-30 | 2021-08-20 | 广东电网有限责任公司 | Error self-calibration method and system of direct current transformer calibrator checking device |
| CN113884966A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Alternating current-direct current sensor broadband calibrator and performance detection calibration method thereof |
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2018
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281692A (en) * | 2021-06-30 | 2021-08-20 | 广东电网有限责任公司 | Error self-calibration method and system of direct current transformer calibrator checking device |
| CN113884966A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Alternating current-direct current sensor broadband calibrator and performance detection calibration method thereof |
| CN113884966B (en) * | 2021-10-27 | 2023-10-20 | 云南电网有限责任公司电力科学研究院 | AC/DC sensor broadband calibrator and performance detection calibration method thereof |
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