CN210775823U - Rogowski coil electronic transformer frequency aliasing characteristic testing device - Google Patents
Rogowski coil electronic transformer frequency aliasing characteristic testing device Download PDFInfo
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- CN210775823U CN210775823U CN201921570677.3U CN201921570677U CN210775823U CN 210775823 U CN210775823 U CN 210775823U CN 201921570677 U CN201921570677 U CN 201921570677U CN 210775823 U CN210775823 U CN 210775823U
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Abstract
The utility model provides a Rogowski coil electronic transformer frequency aliasing characteristic testing arrangement, the test host computer is connected with host computer, electronic transformer, the test host computer includes data generation module, the data acquisition module that main central processing unit, main central processing unit connect, DA conversion module is connected with data generation module, power amplifier, data acquisition module and first AD conversion module, second AD conversion module, optical fiber interface connection, first AD conversion module is connected with CT transform module; the electronic transformer comprises a sensing head, a collector and a merging unit, the sensing head is connected with the CT conversion module, the collector is connected with the second AD conversion module, and the merging unit is connected with the optical fiber interface. Generating a high-frequency signal and a transient fault signal through a power amplifier, and ensuring the accuracy through standard recovery; the data generation module is used for generating different frequency signals for the test system, and the signals in the frequency band and the signals out of the frequency band are tested, so that the test accuracy is improved.
Description
Technical Field
The utility model relates to an intelligent substation intelligence technical field especially relates to a rogowski coil electronic transformer frequency aliasing characteristic test device.
Background
The novel digital measurement technology is widely applied to intelligent substations and direct current converter stations, and Electronic Current Transformers (ECT) are used as key primary and secondary connecting equipment of the digital substations and are responsible for the tasks of measurement, protection and measurement and control signal acquisition and transmission of the whole substation, so that in order to ensure the accuracy and reliability of measurement, the ECT performance is required to be tested and evaluated to meet the requirements of safe and stable operation of a power grid. The electronic current transformer comprises a Rogowski coil current transformer, a low-power current transformer and an all-fiber current transformer. The Rogowski coil current transformer (ROCT) comprises a sensing head, an integrator, a filter, an amplifying circuit, an AD converter, a data processing module and a merging unit.
The sources of influence ROCT errors are: 1) in order to adapt to the wide range of protection current, the Rogowski coil sensing head has small secondary rated output amplitude which is generally hundreds mV level and is easy to be interfered; 2) the filter cannot thoroughly filter signals in the stop band, and the Rogowski coil is sensitive to and amplifies high-frequency signals, so that the high-frequency signals are easy to generate frequency aliasing; 3) and the device parameter error and the temperature drift zero drift of hardware integration. Integrating algorithm errors introduced by software integration; 4) conversion accuracy of AD, noise and non-linear introduced errors; 5) the 'subsampling' error introduced by the synchronous interpolation of the MU; 6) errors introduced by unstable communication of sampled values.
The error source of the rogowski coil current transformer easily causes frequency aliasing, and the frequency aliasing easily causes low test accuracy. At present, a frequency aliasing testing device of the electronic current transformer is not developed. In order to improve the test accuracy, a Rogowski coil electronic transformer frequency aliasing characteristic test device is provided.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electronic transformer's separation test system to the frequency aliasing of solving luo shi coil current transformer causes the technical problem that the test accuracy is low.
In order to solve the technical problem, the embodiment of the utility model discloses following technical scheme:
the utility model provides a rogowski coil electronic transformer frequency aliasing characteristic testing arrangement, includes host computer and test host, and the host computer is connected with the first end electricity of test host, and the second end and the electronic transformer electricity of test host are connected, wherein: the test host comprises a main central processing unit, a data generation module and a data acquisition module, wherein a first end of the main central processing unit is electrically connected with an upper computer, a second end of the main central processing unit is electrically connected with a first end of the data generation module, a third end of the main central processing unit is electrically connected with a first end of the data acquisition module, a second end of the data generation module is electrically connected with a first end of a DA conversion module, a second end of the DA conversion module is electrically connected with a first end of a power amplifier, a second end of the data acquisition module is electrically connected with a first end of a first AD conversion module, a third end of the data acquisition module is electrically connected with a second AD conversion module, a fourth end of the data acquisition module is electrically connected with a first end of an optical fiber interface, and a second end of the first AD conversion module is electrically connected; the electronic transformer comprises a sensing head, a collector and a merging unit, wherein the first end of the sensing head is electrically connected with the second end of the power amplifier, the second end of the sensing head is electrically connected with the second end of the CT conversion module, the first end of the collector and the second AD conversion module are respectively electrically connected with the third end of the sensing head, the second end of the collector is electrically connected with the first end of the merging unit, and the second end of the merging unit is electrically connected with the second end of the optical fiber interface.
Optionally, the first AD conversion module and the second AD conversion module are both 24-bit high-precision ADCs.
Optionally, the data acquisition module includes a synchronization unit and an acquisition unit, and the acquisition unit includes an analog acquisition unit and a digital acquisition unit.
Optionally, the synchronization unit comprises a processing subunit, a crystal oscillator and an output subunit.
Optionally, the digital quantity acquisition unit comprises an FPGA.
Has the advantages that: the utility model provides a rogowski coil electronic transformer frequency aliasing characteristic test device, this testing arrangement include host computer and test host, and the host computer is connected with the first end electricity of test host, and the second end and the electronic transformer electricity of test host are connected, wherein: the test host comprises a main central processing unit, a data generation module and a data acquisition module, wherein a first end of the main central processing unit is electrically connected with an upper computer, a second end of the main central processing unit is electrically connected with a first end of the data generation module, a third end of the main central processing unit is electrically connected with a first end of the data acquisition module, a second end of the data generation module is electrically connected with a first end of a DA conversion module, a second end of the DA conversion module is electrically connected with a first end of a power amplifier, a second end of the data acquisition module is electrically connected with a first end of a first AD conversion module, a third end of the data acquisition module is electrically connected with a second AD conversion module, a fourth end of the data acquisition module is electrically connected with a first end of an optical fiber interface, and a second end of the first AD conversion module is electrically connected; the electronic transformer comprises a sensing head, a collector and a merging unit, wherein the first end of the sensing head is electrically connected with the second end of the power amplifier, the second end of the sensing head is electrically connected with the second end of the CT conversion module, the first end of the collector and the second AD conversion module are respectively electrically connected with the third end of the sensing head, the second end of the collector is electrically connected with the first end of the merging unit, and the second end of the merging unit is electrically connected with the second end of the optical fiber interface. In the using process, firstly, the main central processing unit receives test data of the broadband test signal generated by the upper computer and sends the test data to the data generation module; the data generation module receives the test data and generates different instantaneous value data according to the frequency; the DA conversion module completes analog-to-digital conversion on the received instantaneous value data and converts the instantaneous value data into a small voltage signal; the small voltage signal becomes a large current signal through the power amplifier. Secondly, after the current signal is converted by the CT conversion module, the analog-to-digital conversion is completed by the first AD conversion module, and simultaneously, the digital signal sent by the tested combination unit is collected. And the upper computer completes the frequency response, transient characteristic and frequency aliasing test of the electronic transformer according to the acquired source signal and the sample digital signal. In the frequency aliasing test, the frequency of a test source signal is adjusted according to the test result, and frequency mapping recording is performed when frequency aliasing occurs. In the utility model, the high-frequency signal and the transient fault signal are generated by the power amplifier, and the accuracy is ensured by the standard extraction; the data generation module automatically generates different frequency signals for the test system, and the signals in and out of the frequency band of the electronic transformer can be tested, so that the test accuracy is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a rogowski coil electronic transformer frequency aliasing characteristic testing device provided by the utility model;
description of the drawings: the system comprises a host computer 1, a test host computer 2, an electronic transformer 3, a main central processing unit 21, a data generation module 22, a data acquisition module 23, a data DA conversion module 24, a power amplifier 25, a first AD conversion module 26, a second AD conversion module 27, an optical fiber interface 28, a CT conversion module 29, a sensing head 31, a collector 32 and a merging unit 33.
Detailed Description
Referring to fig. 1, for the utility model provides a pair of luo shi coil electronic transformer frequency aliasing characteristic testing arrangement's structural schematic diagram, can know, the utility model provides a luo shi coil electronic transformer frequency aliasing characteristic testing arrangement, this testing arrangement include host computer 1 and test host computer 2, and host computer 1 is connected with test host computer 2's first end electricity, and test host computer 2's second end is connected with electronic transformer 3 electricity, wherein: the test host 2 comprises a main central processing unit 21 and a data generating module 22, a data acquisition module 23, a first end of a main central processing unit 21 is electrically connected with the upper computer 1, a second end of the main central processing unit 21 is electrically connected with a first end of a data generation module 22, a third end of the main central processing unit 21 is electrically connected with a first end of the data acquisition module 23, a second end of the data generation module 22 is electrically connected with a first end of a DA conversion module 24, a second end of the DA conversion module 24 is electrically connected with a first end of a power amplifier 25, a second end of the data acquisition module 23 is electrically connected with a first end of a first AD conversion module 26, a third end of the data acquisition module 23 is electrically connected with a second AD conversion module 27, a fourth end of the data acquisition module 23 is electrically connected with a first end of an optical fiber interface 28, and a second end of the first AD conversion module 26 is electrically connected with a first end of a; the electronic transformer 3 includes a sensing head 31, a collector 32 and a merging unit 33, a first end of the sensing head 31 is electrically connected to the second end of the power amplifier 25, a second end of the sensing head 31 is electrically connected to the second end of the CT conversion module 29, a first end of the collector 32 and a second AD conversion module 27 are respectively electrically connected to the third end of the sensing head 31, a second end of the collector 32 is electrically connected to the first end of the merging unit 33, and a second end of the merging unit 33 is electrically connected to the second end of the optical fiber interface 28. In the using process, firstly, the main central processing unit 21 receives test data of the broadband test signal generated by the upper computer 1 and sends the test data to the data generation module 22; the data generation module 22 receives the test data and generates different instantaneous value data according to the frequency; the DA conversion module 24 performs analog-to-digital conversion on the received instantaneous value data and converts the instantaneous value data into a small voltage signal; the small voltage signal becomes a large current signal through the power amplifier 25. Secondly, after the current signal is converted by the CT conversion module 29, the first AD conversion module 26 completes analog-to-digital conversion and collects a digital signal sent by the trial combination unit 33. The upper computer 1 completes the frequency response, transient characteristic and frequency aliasing test of the electronic transformer 3 according to the collected source signal and the sample digital signal. In the frequency aliasing test, the frequency of a test source signal is adjusted according to the test result, and frequency mapping recording is performed when frequency aliasing occurs. In the utility model, the high-frequency signal and the transient fault signal are generated by the power amplifier 25, and the accuracy is ensured by the standard extraction; the data generation module 22 automatically generates signals with different frequencies for the test system, and can test signals in and out of the frequency band of the electronic transformer 3, so that the test accuracy is improved.
The first AD conversion module 26 and the second AD conversion module 27 are both 24-bit high-precision ADCs. In the using process, the high-precision AD conversion module adopts a 24-bit high-precision ADC to perform analog-to-digital conversion, the sampling frequency is as high as 200kHz, the sampling time sequence of the ADC is controlled on the basis of a high-precision constant-temperature crystal oscillator not lower than 5ppb, and each sampling value of a standard source signal is calibrated on a time scale.
The data acquisition module 23 includes a synchronization unit and an acquisition unit, and the acquisition unit includes an analog acquisition unit and a digital acquisition unit. The digital quantity acquisition unit comprises an FPGA. In the using process, the digital quantity acquisition unit adopts the FPGA to complete the reception of the Ethernet sampling value and the FT3 sampling value and accurately calibrate the time scale of the sampling value. The synchronization unit comprises a processing subunit, a crystal oscillator and an output subunit. In the using process, the synchronization unit mainly completes the receiving and processing of IEEE1588 and IRIG-B code messages and can accurately control the output of 1PPS second pulse signals and IRIG-B codes to time pulse signals.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (5)
1. The utility model provides a luo shi coil electronic transformer frequency aliasing characteristic testing arrangement, a serial communication port, including host computer (1) and test host computer (2), host computer (1) with the first end electricity of test host computer (2) is connected, the second end and the electronic transformer (3) electricity of test host computer (2) are connected, wherein:
the test host (2) comprises a main central processing unit (21), a data generation module (22) and a data acquisition module (23), wherein the first end of the main central processing unit (21) is electrically connected with the upper computer (1), the second end of the main central processing unit (21) is electrically connected with the first end of the data generation module (22), the third end of the main central processing unit (21) is electrically connected with the first end of the data acquisition module (23), the second end of the data generation module (22) is electrically connected with the first end of the DA conversion module (24), the second end of the DA conversion module (24) is electrically connected with the first end of the power amplifier (25), the second end of the data acquisition module (23) is electrically connected with the first end of the first AD conversion module (26), and the third end of the data acquisition module (23) is electrically connected with the second AD conversion module (27), the fourth end of the data acquisition module (23) is electrically connected with the first end of an optical fiber interface (28), and the second end of the first AD conversion module (26) is electrically connected with the first end of a CT conversion module (29);
electronic transformer (3) are including sensing head (31), collector (32) and merging unit (33), the first end of sensing head (31) with the second end electricity of power amplifier (25) is connected, the second end of sensing head (31) with the second end electricity of CT transform module (29) is connected, the first end of collector (32) with second AD conversion module (27) electricity respectively is connected the third end of sensing head (31), the second end of collector (32) with the first end electricity of merging unit (33) is connected, the second end of merging unit (33) with the second end electricity of optical fiber interface (28) is connected.
2. The test device according to claim 1, wherein the first AD conversion module (26) and the second AD conversion module (27) are each a 24-bit high precision ADC.
3. The testing device according to claim 2, characterized in that the data acquisition module (23) comprises a synchronization unit and an acquisition unit, the acquisition unit comprising an analog quantity acquisition unit and a digital quantity acquisition unit.
4. The test device of claim 3, wherein the synchronization unit comprises a processing subunit, a crystal oscillator, and an output subunit.
5. The test device of claim 3, wherein the digital quantity acquisition unit comprises an FPGA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921570677.3U CN210775823U (en) | 2019-09-20 | 2019-09-20 | Rogowski coil electronic transformer frequency aliasing characteristic testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921570677.3U CN210775823U (en) | 2019-09-20 | 2019-09-20 | Rogowski coil electronic transformer frequency aliasing characteristic testing device |
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| Publication Number | Publication Date |
|---|---|
| CN210775823U true CN210775823U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921570677.3U Active CN210775823U (en) | 2019-09-20 | 2019-09-20 | Rogowski coil electronic transformer frequency aliasing characteristic testing device |
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| Country | Link |
|---|---|
| CN (1) | CN210775823U (en) |
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2019
- 2019-09-20 CN CN201921570677.3U patent/CN210775823U/en active Active
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