CN211478635U - DC mutual inductor calibrator - Google Patents
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Abstract
The utility model provides a direct current transformer check gauge, include: the first digital multimeter is used for acquiring a first standard analog signal of a standard direct current transformer and a second standard analog signal of the standard direct current transformer; the second digital multimeter is used for collecting analog signals to be checked of the direct current transformer to be checked; the GPIB acquisition card is used for acquiring a first standard analog signal, an analog signal to be checked and a second standard analog signal; the protocol converter is used for converting the acquired digital signal of the FT3 protocol into to-be-verified sampling data of a TCP/IP protocol; the PC industrial personal computer is used for displaying the steady-state error of the analog quantity output type direct current transformer determined according to the first standard analog signal and the analog signal to be checked; or displaying the steady-state error of the digital quantity output type direct current transformer determined according to the second standard analog signal and the sampling data to be verified. By the technical scheme, the analog quantity and digital quantity output type direct current transformer can be verified, and cost is reduced.
Description
Technical Field
The utility model relates to an equipment check-up technical field, in particular to direct current transformer check gauge.
Background
With the promotion of global energy internet construction and the continuous development of direct current transmission, a direct current transformer is used as a key device for measuring direct current voltage and current signals in a direct current transmission project, the measurement accuracy of the direct current transformer is related to the stability and the reliability of control protection of the direct current transmission project, the direct current transformer needs to be calibrated in order to ensure the safe and stable operation of the direct current transmission project, and a direct current transformer calibrator is used as a calibration calibrating and calibrating device of the direct current transformer and is increasingly applied.
At present, the structure of the direct current transformer calibrator on the market only has the analog quantity or digital quantity output type direct current transformer calibration function, and an additional clock synchronization device is needed, so that the cost is high.
In view of the above problems, no effective solution has been proposed.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a direct current transformer check gauge for realize the error check-up to analog quantity output type and digital quantity output type direct current transformer, reduce cost, this check gauge includes:
the system comprises a first digital multimeter, a second digital multimeter, a GPIB acquisition card, a protocol converter and a PC industrial personal computer, wherein:
the first digital multimeter is connected with the analog signal output end of the standard direct current transformer and used for acquiring a first standard analog signal of the standard direct current transformer according to the first synchronous trigger instruction; or acquiring a second standard analog signal of the standard direct current transformer according to a second synchronous trigger instruction;
the second digital multimeter is connected with the analog signal output end of the direct current transformer to be verified when the direct current transformer to be verified is an analog quantity output type direct current transformer, and is used for acquiring an analog signal to be verified of the direct current transformer to be verified according to the first synchronous trigger instruction;
the GPIB acquisition card is connected with the first digital multimeter and the second digital multimeter and is used for sending a first synchronous trigger instruction according to the control of the PC industrial personal computer when the direct current transformer to be verified is an analog quantity output type direct current transformer, acquiring the first standard analog signal and the analog signal to be verified which are fed back according to the first synchronous trigger instruction and sending the first standard analog signal and the analog signal to be verified to the PC industrial personal computer; or when the direct current transformer to be verified is a digital quantity output type direct current transformer, acquiring a second standard analog signal fed back according to a second synchronous trigger instruction, and sending the second standard analog signal to the industrial personal computer;
the protocol converter is connected with a digital signal output end of the direct current transformer to be verified when the direct current transformer to be verified is a digital quantity output type direct current transformer, and is used for sending a second synchronous trigger instruction according to the control of the PC industrial personal computer, acquiring a digital signal of an FT3 protocol fed back according to the second synchronous trigger instruction, converting the digital signal of the FT3 protocol into sampling data to be verified of a TCP/IP protocol, and sending the sampling data to be verified to the PC industrial personal computer;
the PC industrial personal computer is connected with the GPIB acquisition card and the protocol converter and is used for displaying the steady-state error of the analog quantity output type direct current transformer determined according to the first standard analog signal and the analog signal to be checked; or displaying the steady-state error of the digital quantity output type direct current transformer determined according to the second standard analog signal and the sampling data to be verified.
Compare with current tester that only possesses analog quantity or digital quantity output type direct current transformer check-up function and need extra clock synchronizer, the embodiment of the utility model provides a tester passes through: when the direct current transformer to be verified is an analog quantity output type direct current transformer: the GPIB acquisition card sends out a first synchronous trigger instruction according to the control of a PC industrial personal computer; the first digital multimeter and the second digital multimeter synchronously acquire signals according to the first synchronous trigger instruction, and the first digital multimeter acquires a first standard analog signal of a standard direct current transformer; the second digital multimeter collects analog signals to be checked of the direct current transformer to be checked; the GPIB acquisition card acquires the first standard analog signal and the analog signal to be checked which are fed back according to the first synchronous trigger instruction, and sends the first standard analog signal and the analog signal to be checked to the PC industrial personal computer; the PC industrial personal computer displays the steady-state error of the analog quantity output type direct current transformer determined according to the first standard analog signal and the analog signal to be verified; when the direct current transformer to be verified is a digital output direct current transformer: the protocol converter sends a second synchronous trigger instruction according to the control of the PC industrial personal computer; the first digital multimeter and the protocol converter synchronously acquire signals according to a second synchronous trigger instruction, the first digital multimeter acquires a second standard analog signal of the standard direct current transformer, the protocol converter acquires a digital signal of an FT3 protocol, converts the digital signal of the FT3 protocol into sampling data to be verified of a TCP/IP protocol, and sends the sampling data to be verified to a PC industrial personal computer; the GPIB acquisition card acquires the second standard analog signal fed back according to a second synchronous trigger instruction and sends the second standard analog signal to the industrial personal computer; the PC industrial personal computer displays the steady-state error of the digital quantity output type direct current transformer determined according to the second standard analog signal and the sampling data to be verified, error verification of the analog quantity output type direct current transformer and the digital quantity output type direct current transformer is achieved, the protocol converter has a clock synchronization output function, and when the direct current transformer to be verified is the digital quantity output type direct current transformer, a second synchronization trigger instruction is sent without an additional clock synchronization device; when the direct current transformer to be verified is an analog output type direct current transformer, the GPIB acquisition card sends out a first synchronous trigger instruction according to the control of the PC industrial personal computer, a rated clock synchronization device is not needed, and the direct current transformer to be verified is simple in structure and low in cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the embodiment of the utility model provides an embodiment direct current transformer check gauge's schematic structure diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a direct current transformer check gauge, include: the digital multimeter, the protocol converter, the GPIB parallel cable, the GPIB acquisition card and the PC industrial personal computer, the two digital multimeters respectively realize the analog quantity acquisition of the standard direct current transformer and the measured direct current transformer, the measurement accuracy is high, the quantity value tracing is convenient, and the electromagnetic compatibility is strong; the GPIB acquisition card and the GPIB parallel cable can realize the synchronous control acquisition of the two digital multimeters; the protocol converter performs full-channel analysis on FT3 digital quantity to realize digital quantity acquisition analysis and clock synchronization functions of the direct current transformer to be tested; the PC industrial personal computer can realize data processing, error calculation and storage, and graphical real-time display of analog signal sampling waveforms and full-channel analytic waveform display of FT3 digital signals by using the existing method, is suitable for a direct current transformer quantity value traceability test in a laboratory, and can also be used for a field calibration test of a direct current transformer in a direct current converter station, and the direct current transformer calibrator can realize error calibration of analog quantity output type and digital quantity output type direct current transformers.
The following is the embodiment of the utility model provides a direct current transformer check gauge introduces in detail.
Fig. 1 is the embodiment of the utility model provides an in the structure schematic diagram of direct current transformer check gauge, as shown in fig. 1, this direct current transformer check gauge includes:
the system comprises a first digital multimeter 01, a second digital multimeter 02, a GPIB acquisition card 03, a protocol converter 04 and a PC industrial personal computer 05, wherein:
the first digital multimeter 01 is connected with the analog signal output end of the standard direct current transformer and used for acquiring a first standard analog signal of the standard direct current transformer according to a first synchronous trigger instruction; or acquiring a second standard analog signal of the standard direct current transformer according to a second synchronous trigger instruction;
the second digital multimeter 02 is connected with the analog signal output end of the direct current transformer to be verified when the direct current transformer to be verified is an analog quantity output type direct current transformer, and is used for acquiring an analog signal to be verified of the direct current transformer to be verified according to the first synchronous trigger instruction;
the GPIB acquisition card 03 is connected with the first digital multimeter and the second digital multimeter and is used for sending a first synchronous trigger instruction according to the control of the PC industrial personal computer when the direct current transformer to be verified is an analog quantity output type direct current transformer, acquiring the first standard analog signal and the analog signal to be verified which are fed back according to the first synchronous trigger instruction and sending the first standard analog signal and the analog signal to be verified to the PC industrial personal computer; or when the direct current transformer to be verified is a digital quantity output type direct current transformer, acquiring a second standard analog signal fed back according to a second synchronous trigger instruction, and sending the second standard analog signal to the industrial personal computer;
the protocol converter 04 is connected with a digital signal output end of the direct current transformer to be verified when the direct current transformer to be verified is a digital quantity output type direct current transformer, and is used for sending a second synchronous trigger instruction according to the control of the PC industrial personal computer, acquiring a digital signal of an FT3 protocol fed back according to the second synchronous trigger instruction, converting the digital signal of the FT3 protocol into sampling data to be verified of a TCP/IP protocol, and sending the sampling data to be verified to the PC industrial personal computer;
the PC industrial personal computer 05 is connected with the GPIB acquisition card and the protocol converter and is used for displaying the steady-state error of the analog quantity output type direct current transformer determined according to the first standard analog signal and the analog signal to be verified; or displaying the steady-state error of the digital quantity output type direct current transformer determined according to the second standard analog signal and the sampling data to be verified.
Compared with the existing tester which only has the analog quantity or digital quantity output type direct current transformer checking function and needs an additional clock synchronization device, the tester provided by the embodiment of the utility model realizes the error checking of the analog quantity and digital quantity output type direct current transformers, and the protocol converter has the clock synchronization output function and is used for sending a second synchronization trigger instruction without the additional clock synchronization device when the direct current transformer to be checked is the digital quantity output type direct current transformer; when the direct current transformer to be verified is an analog output type direct current transformer, the GPIB acquisition card sends out a first synchronous trigger instruction according to the control of the PC industrial personal computer, a rated clock synchronization device is not needed, and the direct current transformer to be verified is simple in structure and low in cost.
When the embodiment of the utility model provides a protect the structure to analog quantity and digital quantity output type direct current transformer's error check, what relate to for example: the methods of protocol conversion, control, signal conversion, error calculation, etc. may be implemented by using conventional methods, circuits, chips or processors, which are all described in the embodiments.
The structure of the dc transformer calibrator will be described in detail below.
In specific implementation, as shown in fig. 1, when the dc transformer to be tested is an analog output dc transformer, the PC industrial personal computer sends SCPI commands to the first digital multi-purpose meter 01 and the second digital multi-purpose meter 02 through the GPIB parallel cable and the GPIB acquisition card, respectively, controls the PC industrial personal computer to synchronously sample the analog output signal of the standard transformer and the analog output signal of the transformer to be tested, the sampling data of the standard mutual inductor and the tested mutual inductor collected by the first digital multimeter 01 and the second digital multimeter 02 are transmitted to a PC industrial personal computer through a GPIB parallel cable and a GPIB acquisition card, the sampling data are processed by the PC industrial personal computer, the error of the tested direct current mutual inductor is calculated, the error calculation belongs to the prior art, the error calculation formula is the same, in the checking process, sampling synchronous trigger signals of the first digital multimeter 01 and the second digital multimeter 02 are SCPI software synchronous trigger instructions sent by a PC industrial personal computer through a GPIB acquisition card; when the checked DC transformer is a digital output type DC transformer, the PC industrial personal computer sends SCPI instruction to the first digital multimeter 01 through the GPIB parallel cable and the GPIB acquisition card to control the SCPI instruction to sample the analog output signal of the standard transformer, the sampling data of the standard mutual inductor collected by the first digital multimeter 01 is transmitted to a PC industrial personal computer through a GPIB parallel cable and a GPIB acquisition card, a protocol converter is utilized to receive the digital signal of FT3 protocol of the mutual inductor to be detected, and the digital signal of the FT3 protocol is completely analyzed and framed into sampling data of the TCP/IP protocol, the sampling data of the tested mutual inductor of the TCP/IP protocol is sent to a PC industrial personal computer through the Ethernet, the sampling data of a standard mutual inductor and the sampling data of the tested mutual inductor are processed by the PC industrial personal computer, the error of the tested direct current mutual inductor is calculated, and the error calculation belongs to the prior art: the analog signal and the digital signal are converted into a primary measurement value according to the transformation ratio of the corresponding mutual inductor, and the error can be calculated according to the existing error calculation method.
The conventional error calculation method mentioned above is described below.
When the digital quantity output type direct current transformer is verified, assuming that the transformation ratio of a standard direct current transformer is k0 and the transformation ratio of a tested direct current transformer is k1, and a secondary voltage signal output by the standard direct current transformer acquired by a first digital multimeter 01 is Us, a digital output signal of the tested direct current transformer received by a protocol converter is M, calculating and converting the primary voltage of the standard direct current transformer into U (k 0 × Us), and converting the primary voltage of the tested direct current transformer into U1 (k 1 × M), then according to an error calculation formula (U1-U)/U;
when the analog quantity output type direct current transformer is verified, the principle is similar. Assuming that the transformation ratio of the standard dc transformer is k0, the transformation ratio of the dc transformer to be measured is k1, the secondary voltage signal output by the standard dc transformer collected by the first digital multimeter 01 is Us, the secondary voltage signal output by the dc transformer to be measured collected by the second digital multimeter 02 is Ud, the primary voltage of the standard dc transformer is calculated and converted into U-k 0 × Us, and the primary voltage of the dc transformer to be measured is converted into U1-k 1 × Ud, then the formula is (U1-U)/U according to the error calculation formula.
In one embodiment, the protocol converter may include: the device comprises a photoelectric conversion module, an FPGA module, an embedded module, an Ethernet module and a clock synchronization module; the digital signal of the FT3 protocol is an optical digital signal; wherein:
the photoelectric conversion module is used for receiving the optical digital signal and converting the optical digital signal into an electrical digital signal;
the FPGA module is used for decoding the electric digital signal to obtain sampling data of the direct current transformer to be verified;
the embedded module is used for framing the sampling data into a TCP/IP Ethernet protocol packet;
and the Ethernet module is used for outputting the TCP/IP Ethernet protocol packet to a PC industrial personal computer as the sampling data to be checked.
In specific implementation, the protocol converter mainly comprises a photoelectric conversion module, an FPGA module, an embedded module, an Ethernet module and a clock synchronization module. The photoelectric conversion module is used for receiving an optical digital output signal from a tested direct current transformer and converting the optical digital output signal into an electrical digital signal, and can be realized by an existing photoelectric conversion chip or circuit; the FPGA module can utilize the FPGA chip of the existing Cyclone IV EP4CE55 series to decode the electric digital signal of the photoelectric conversion module and analyze the sampling data of the tested direct current transformer; the embedded module can utilize the existing MPC8313 processor with 333MHz main frequency to frame the sampling data of the tested direct current transformer analyzed by the FPGA module into a TCP/IP Ethernet protocol packet; the Ethernet module outputs the TCP/IP Ethernet protocol packet through an RJ45 electric Ethernet interface; the clock synchronization module generates a pulse per second signal with the frequency of 1Hz through the FPGA frequency division by the internal crystal oscillator or from the outside, outputs the pulse per second signal through the BNC coaxial cable interface and is used for triggering the internal FPGA module to decode the electric digital signal output by the photoelectric conversion module, and the existing decoding technology can be utilized.
During specific implementation, the protocol converter adopts a double-framework of FGPA and an embedded processor, an FPGA chip is used for receiving and analyzing the FT3 digital protocol, and the embedded processor is used for running an Ethernet protocol stack and framing an Ethernet protocol packet to realize real-time analysis of the FT3 digital protocol. The utility model discloses mainly protect this protocol converter's structure, inside implementation method all can utilize current chip, circuit or treater to realize.
In one embodiment, the protocol converter further comprises: and the clock synchronization module is used for generating a PPS second pulse synchronization signal as the second synchronization trigger instruction.
During specific implementation, in the checking process, the synchronous trigger signals sampled by the protocol converter and the first digital multimeter 01 are PPS second pulse synchronous signals generated by a clock synchronous module integrated in the protocol converter, an additional clock synchronous device is not needed, and the device is simple in structure and low in cost.
In specific implementation, when the digital quantity output type direct current transformer is checked, the first digital multimeter 01 and the protocol converter synchronously sample an analog output signal of the standard transformer and a digital output signal of the tested transformer, and a synchronous trigger signal is provided by a pulse per second with the frequency of 1Hz generated by frequency division of a crystal oscillator in a clock synchronization module in the protocol converter, so that an additional clock synchronization device is not needed.
In one embodiment, the dc transformer calibrator may further include: and the first end of the GPIB parallel cable is connected with the first end of the GPIB acquisition card, the first end of the GPIB parallel cable is connected with the first digital multimeter, and the second end of the GPIB parallel cable is connected with the second digital multimeter.
In one embodiment, the PC industrial personal computer may include:
the USB interface is connected with the second end of the GPIB acquisition card;
and the Ethernet interface is connected with the output end of the protocol converter.
In one embodiment, the first digital multi-purpose table and the second digital multi-purpose table may be Agilent34410A or Agilent 34465a digital multi-purpose tables.
In specific implementation, both ends of the GPIB parallel cable are GPIB interfaces, which are respectively connected with the GPIB control interfaces of the first digital multimeter 01 and the second digital multimeter 02, one end of the GPIB acquisition card is a GPIB interface, the other end of the GPIB acquisition card is a USB interface, the GPIB interface of the GPIB acquisition card is connected to one end interface of the GPIB parallel cable, and the USB interface of the GPIB acquisition card is connected to a USB interface of a PC industrial personal computer.
In specific implementation, one GPIB parallel cable is respectively connected to GPIB control interfaces of the two digital multimeters, and 1 GPIB acquisition card is used for realizing simultaneous control of the two digital multimeters, so that USB hardware resources are saved compared with the case that two GPIB acquisition cards are used for controlling the two digital multimeters.
In specific implementation, the first digital multimeter 01 and the second digital multimeter 02 are digital multimeters of the same model and specification, have an analog voltage sampling port, a GPIB control interface and a hardware synchronization trigger port, and are compatible with SCPI control instructions. The type of the digital multimeter is generally Agilent34410A or Agilent 34465A, and the digital multimeter can also be a digital multimeter or an A/D sampling card with the same series and the function of similar parameters. The digital multimeter has the main functions of receiving SCPI control instructions of a PC industrial personal computer at a GPIB control interface, sampling analog output signals of a standard mutual inductor and a tested mutual inductor through an analog voltage sampling port, and transmitting sampling data to the PC industrial personal computer for data processing and error calculation. When the digital quantity output type direct current transformer is verified, the synchronous trigger port of the first digital multi-purpose meter 01 receives a PPS second pulse synchronous signal from the protocol converter.
In one embodiment, the protocol converter is connected with the PC industrial personal computer through an RJ45 Ethernet cable, and a clock synchronization output interface of the protocol converter is connected to a synchronization triggering port of the second digital multimeter through a BNC coaxial cable.
In one embodiment, the PC industrial personal computer is further configured to store the first standard analog signal, the second standard analog signal, the analog signal to be verified, the sampling data to be verified, and the steady-state error data.
In one embodiment, the PC industrial personal computer is further configured to display the first standard analog signal, the second standard analog signal, the analog signal to be verified, and the sampling data to be verified.
In one embodiment, the PC industrial personal computer is further configured to display the first standard analog signal, the second standard analog signal, the analog signal to be verified, the sampling data to be verified, and the steady-state error data in a partitioned manner.
During specific implementation, a Windows 7 and above series operating systems and upper computer software developed based on LabVIEW are operated on a PC (personal computer), the PC receives analog output sampling data of a standard mutual inductor and a tested mutual inductor transmitted by a GPIB (general purpose interface bus) acquisition card through a USB (universal serial bus) interface, receives digital output sampling data of the tested mutual inductor output by a protocol converter through an Ethernet interface, calculates and displays a steady-state error of the tested direct current mutual inductor by using the existing method, and simultaneously stores the sampling data and the error data into an Excel table; the LabVIEW upper computer interface adopts a 4-grid structure, the upper left area is a sampling waveform display area of a standard mutual inductor and a tested mutual inductor and a digital channel full-analysis waveform display area of the tested mutual inductor, the upper right area is a sampling original data recording area and an error result display area, the lower left area is a digital multimeter hardware parameter setting and test parameter setting area, and the lower right area is a control area for starting, pausing, stopping, storing and the like of upper computer software, so that the display mode is convenient and visual.
The utility model discloses the implementation provides technical scheme's beneficial technological effect is:
compared with the existing tester which only has the analog quantity or digital quantity output type direct current transformer checking function and needs an additional clock synchronization device, the tester provided by the embodiment of the utility model realizes the error checking of the analog quantity and digital quantity output type direct current transformers, and the protocol converter has the clock synchronization output function and is used for sending a second synchronization trigger instruction without the additional clock synchronization device when the direct current transformer to be checked is the digital quantity output type direct current transformer; when the direct current transformer to be verified is an analog output type direct current transformer, the GPIB acquisition card sends out a first synchronous trigger instruction according to the control of the PC industrial personal computer, a rated clock synchronization device is not needed, and the direct current transformer to be verified is simple in structure and low in cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a direct current transformer check gauge which characterized in that includes: the system comprises a first digital multimeter, a second digital multimeter, a GPIB acquisition card, a protocol converter and a PC industrial personal computer, wherein:
the first digital multimeter is connected with the analog signal output end of the standard direct current transformer and used for acquiring a first standard analog signal of the standard direct current transformer according to the first synchronous trigger instruction; or acquiring a second standard analog signal of the standard direct current transformer according to a second synchronous trigger instruction;
the second digital multimeter is connected with the analog signal output end of the direct current transformer to be verified when the direct current transformer to be verified is an analog quantity output type direct current transformer, and is used for acquiring an analog signal to be verified of the direct current transformer to be verified according to the first synchronous trigger instruction;
the GPIB acquisition card is connected with the first digital multimeter and the second digital multimeter and is used for sending a first synchronous trigger instruction according to the control of the PC industrial personal computer when the direct current transformer to be verified is an analog quantity output type direct current transformer, acquiring the first standard analog signal and the analog signal to be verified which are fed back according to the first synchronous trigger instruction and sending the first standard analog signal and the analog signal to be verified to the PC industrial personal computer; or when the direct current transformer to be verified is a digital quantity output type direct current transformer, acquiring a second standard analog signal fed back according to a second synchronous trigger instruction, and sending the second standard analog signal to the industrial personal computer;
the protocol converter is connected with a digital signal output end of the direct current transformer to be verified when the direct current transformer to be verified is a digital quantity output type direct current transformer, and is used for sending a second synchronous trigger instruction according to the control of the PC industrial personal computer, acquiring a digital signal of an FT3 protocol fed back according to the second synchronous trigger instruction, converting the digital signal of the FT3 protocol into sampling data to be verified of a TCP/IP protocol, and sending the sampling data to be verified to the PC industrial personal computer;
the PC industrial personal computer is connected with the GPIB acquisition card and the protocol converter and is used for displaying the steady-state error of the analog quantity output type direct current transformer determined according to the first standard analog signal and the analog signal to be checked; or displaying the steady-state error of the digital quantity output type direct current transformer determined according to the second standard analog signal and the sampling data to be verified;
the DC transformer calibrator further comprises: the first end of the GPIB parallel cable is connected with the first end of the GPIB acquisition card, the first end of the GPIB parallel cable is connected with the first digital multimeter, and the second end of the GPIB parallel cable is connected with the second digital multimeter;
the PC industrial computer includes: the USB interface is connected with the second end of the GPIB acquisition card; the Ethernet interface is connected with the output end of the protocol converter;
the first digital multimeter and the second digital multimeter adopt Agilent34410A or Agilent 34465A digital multimeters;
the protocol converter is connected with a PC industrial personal computer through an RJ45 Ethernet cable, and a clock synchronization output interface of the protocol converter is connected to a synchronization trigger port of the second digital multimeter through a BNC coaxial cable.
2. The dc transformer verifier of claim 1, wherein the protocol converter comprises: the device comprises a photoelectric conversion module, an FPGA module, an embedded module, an Ethernet module and a clock synchronization module; the digital signal of the FT3 protocol is an optical digital signal; wherein:
the photoelectric conversion module is used for receiving the optical digital signal and converting the optical digital signal into an electrical digital signal;
the FPGA module is used for decoding the electric digital signal to obtain sampling data of the direct current transformer to be verified;
the embedded module is used for framing the sampling data into a TCP/IP Ethernet protocol packet;
and the Ethernet module is used for outputting the TCP/IP Ethernet protocol packet to a PC industrial personal computer as the sampling data to be checked.
3. The dc transformer verifier of claim 2, wherein the protocol converter further comprises: and the clock synchronization module is used for generating a PPS second pulse synchronization signal as the second synchronization trigger instruction.
4. The direct current transformer calibrator according to claim 1, wherein the PC industrial personal computer is further configured to store the first standard analog signal, the second standard analog signal, the analog signal to be calibrated, the sampling data to be calibrated, and the steady-state error data.
5. The direct current transformer calibrator according to claim 1, wherein the PC industrial personal computer is further configured to display the first standard analog signal, the second standard analog signal, the analog signal to be calibrated, and the sampling data to be calibrated.
6. The DC transformer calibrator according to claim 1, wherein the PC industrial personal computer is further configured to display the first standard analog signal, the second standard analog signal, the analog signal to be calibrated, the sampling data to be calibrated, and the steady-state error data in a partitioned manner.
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| CN201921515384.5U CN211478635U (en) | 2019-09-11 | 2019-09-11 | DC mutual inductor calibrator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488214A (en) * | 2019-09-11 | 2019-11-22 | 国网冀北电力有限公司电力科学研究院 | DC mutual inductor verification instrument and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488214A (en) * | 2019-09-11 | 2019-11-22 | 国网冀北电力有限公司电力科学研究院 | DC mutual inductor verification instrument and working method |
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