CN204719222U - A kind of portable electronic piece formula current transformer calibration device - Google Patents
A kind of portable electronic piece formula current transformer calibration device Download PDFInfo
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- CN204719222U CN204719222U CN201520303373.6U CN201520303373U CN204719222U CN 204719222 U CN204719222 U CN 204719222U CN 201520303373 U CN201520303373 U CN 201520303373U CN 204719222 U CN204719222 U CN 204719222U
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Abstract
The utility model relates to a kind of portable electronic piece formula current transformer calibration device, comprise standard current transformer, high-current cable, two times transfer device, merge cells, pressure regulator, precision resistance and data processing circuit, pressure regulator output voltage is connected with the secondary side input end of standard current transformer by series connection precision resistance, the voltage at precision resistance two ends by cable leading to data processing circuit, the primary side output terminal of standard current transformer is connected with high-current cable, high-current cable is also connected electronic current mutual inductor to be measured being connected with the primary side input end of electronic current mutual inductor to be measured, secondary side output terminal connecting secondary converter and the merge cells successively of electronic current mutual inductor to be measured, merge cells exports current signal to be measured to data processing circuit, data processing circuit output verification result.This device has that checking precision is high, volume is little, lightweight, the advantage such as portable, with low cost.
Description
Technical field
The utility model relates to a kind of power equipment calibration technology field, particularly a kind of portable electronic piece formula current transformer calibration device.
Background technology
Current transformer (be called for short CT) is the visual plant of electric energy metrical and relay protection in electric system, and safety, the stable operation of its long-time stability, reliability, security and electric system are closely related.The current transformer of current use mainly contains two large classes: a class is electromagnetic current transducer, and another kind of is electronic current mutual inductor.
Conventional electromagnetic current transformer is based on electromagnetic induction principle, and application has the history of more than 100 year, but they exist some shortcomings, can not meet the demand of New Generation of Intelligent transformer substation construction development.(1) insulation system is complicated, needs injecting oil and gas, has explosion danger; Magnetic saturation easily causes the overheated burning apparatus of iron core; There is the potential safety hazards such as second open circuit; (2) there is magnetic saturation, dynamic measurement precision is poor, can not correct progress of disease primary current when electric network fault, the requirement of quick relay protection cannot be met; May be there is magnetic saturation phenomenon when electric network fault in the ferromagnetic material in electromagnetic transformer, be difficult to adapt to extra-high voltage relay protection requirement fast and accurately; (3) insulation system is complicated.Electric pressure is higher, and insulation system is more complicated, and size, weight, consumptive material, price all increase by geometric progression; (4) metal consumptive material is many, and energy consumption is high.
Electronic current mutual inductor is a kind of new transformer got up based on sensing technology and the optronics technique development of advanced person, mainly contains Luo-coil formula, magneto-optic glass formula and all-fiber formula three kinds of electronic current mutual inductors at present.Active type and passive two kinds can be divided into.Active electronic current transformer is as Luo-coil formula, and adopt Rogowski coil as sensitive element, its sensitivity principle is identical with electromagnetic current transducer.Passive electronic current mutual inductor, based on Faraday magnetooptical effect, as magneto-optic glass formula and all-fiber formula, has the advantages such as reliability is high, antijamming capability is strong.
The development of electronic mutual inductor will inevitably bring improvement and the renewal of the mode of calibrating for error.Apparatus for checking electronic type current mutual inductor is the Special precision instrument for checking and measure electronic current mutual inductor error.Recommend in international electrical engineering standard IEC60044-8 and standard GB/T/T20840.8-2007 to adopt following two kinds of verification modes: (1) carries out analog to digital conversion to electromagnetic current transducer secondary output terminal, enters electronic current mutual inductor tester (abbreviation tester) simultaneously carry out comparing with electronic current mutual inductor data to be measured; (2) directly adopt the sufficiently high electronic current mutual inductor of degree of accuracy, enter tester with electronic current mutual inductor data to be measured simultaneously and carry out comparing.Current domestic apparatus for checking electronic type current mutual inductor mainly adopts (1) kind mode to realize.The structure of conventional apparatus for checking electronic type current mutual inductor as shown in Figure 1, comprise strong current generator, standard current transformer 1 (i.e. standard CT), electronic current mutual inductor tester, the major equipments such as two times transfer device and merge cells, strong current generator forms current return by high-current cable, after strong current generator generation alternating current, electromagnetic induction is to the primary side input end of standard current transformer 1, secondary side output terminal (or perhaps from secondary side output signal) outputting analog signal of standard current transformer 1 enters electronic current mutual inductor tester, electronic current mutual inductor tester carries out analog to digital conversion to it and obtains standard signal, simultaneously, strong current generator produces electromagnetic induction after alternating current or the Faradic electricity magnetic effect primary side input end to electronic current mutual inductor 2 to be measured, the light signal that the secondary side output terminal of electronic current mutual inductor 2 to be measured exports with current information enters two times transfer device, two times transfer device carries out signal receiving and exports digital current information, digital frame signal (i.e. measured signal) is exported again to electronic current mutual inductor tester after merge cells, electronic current mutual inductor tester carries out output verification result after amplitude and phase compare to the standard signal received and measured signal, higher verification degree of accuracy can be obtained, but it is larger to there is volume in the strong current generator adopted in this calibration equipment, Heavy Weight, the shortcomings such as somewhat expensive (can be moved by an adult by miscellaneous equipment, and strong current generator weight is usually at more than hundreds of kg).
Utility model content
It is larger that the utility model adopts strong current generator to there is volume for existing apparatus for checking electronic type current mutual inductor, Heavy Weight, the problems such as somewhat expensive, a kind of portable electronic piece formula current transformer calibration device is provided, eliminates strong current generator, can verify electronic current mutual inductor accurately and easily, have that checking precision is high, volume is little, lightweight, the advantages such as structure is simple, with low cost.
The technical solution of the utility model is as follows:
A kind of portable electronic piece formula current transformer calibration device, for the verification of electronic current mutual inductor to be measured, comprise standard current transformer, high-current cable, two times transfer device and merge cells, it is characterized in that, also comprise pressure regulator, precision resistance and data processing circuit, the precision of described precision resistance is higher than 0.05 grade, described pressure regulator output voltage is connected with the secondary side input end of standard current transformer by series connection precision resistance, the voltage at described precision resistance two ends by cable leading to data processing circuit, the primary side output terminal of described standard current transformer is connected with high-current cable, described high-current cable is also connected electronic current mutual inductor to be measured being connected with the primary side input end of electronic current mutual inductor to be measured, secondary side output terminal connecting secondary converter and the merge cells successively of described electronic current mutual inductor to be measured, described merge cells exports current signal to be measured to data processing circuit, obtain standard current signal divided by precision resistance after the voltage at the precision resistance two ends of reception is carried out analog to digital conversion by described data processing circuit and after data syn-chronization with current signal comparison to be measured and then output verification result.
Described data processing circuit comprises the signal conditioning circuit, AD acquisition chip and the FPGA processor that connect successively, described data processing circuit also comprises the photoelectric switching circuit and electro-optical conversion circuit that are all connected with FPGA processor, described signal conditioning circuit introduces the voltage at precision resistance two ends, described photoelectric switching circuit is all connected with merge cells with electro-optical conversion circuit, described FPGA processor output verification result.
Described precision resistance is four line precision resistances.
Described FPGA processor exports synchronizing pulse to merge cells by electro-optical conversion circuit, and described synchronizing pulse is pulse per second (PPS) or B code; The data that described merge cells sends are connected with FPGA processor by photoelectric switching circuit according to IEC61850-9-1 or IEC61850-9-2 communication protocol.
Described AD acquisition chip is the benchmark AD converter of 16, and the accuracy of described benchmark AD converter is higher than 0.05 grade.
The accuracy of described standard current transformer is higher than 0.05 grade.
Technique effect of the present utility model is as follows:
The portable electronic piece formula current transformer calibration device that the utility model provides, pressure regulator is set, precision resistance and data processing circuit, with standard current transformer, high-current cable, two times transfer device and merge cells cooperating, pressure regulator output voltage is connected with the secondary side input end of standard current transformer by series connection precision resistance, the primary side output terminal of standard current transformer is connected with high-current cable, that is, pressure regulator output voltage by series connection precision resistance act on standard current transformer secondary side thus at the secondary side input current of standard current transformer, and make the primary side of standard current transformer export big current by electromagnetic induction, like this, closed great current mutual inductor has big current, this big current is applied to the primary side input end of electronic current mutual inductor to be measured by electromagnetic induction or Faradic electricity magnetic effect, the light signal that the secondary side output terminal of electronic current mutual inductor to be measured is exported with current information enters two times transfer device, two times transfer device carries out signal receiving and exports digital current information, measured signal is exported again to data processing circuit after merge cells, the voltage at precision resistance two ends by cable leading to data processing circuit, obtain standard current signal divided by precision resistance after the voltage at the precision resistance two ends of reception is carried out analog to digital conversion by data processing circuit and after data syn-chronization with current signal comparison to be measured and then output verification result.Calibration equipment described in the utility model is applied to the secondary side of standard current transformer by arranging pressure regulator and precision resistance generation current, change the current trend of standard current transformer, the secondary side small area analysis of standard current transformer is inputted, primary side High-current output, this produces big current with regard to direct on closed high-current cable, without the need to adopting strong current generator, serial standard current transformer and electronic current mutual inductor to be measured on closed high-current cable, avoiding problems prior art adopts the volume that causes of strong current generator larger, Heavy Weight, the problems such as somewhat expensive, the voltage at precision resistance two ends carries out follow-up data process by cable leading to data processing circuit and can obtain standard current signal accurately, by itself and current signal comparison to be measured and then output verification result.Whole apparatus structure is simple, and volume is little, lightweight, with low cost, and has portability, applying flexible, can verify accurately and easily, and have submitted checkability to electronic current mutual inductor.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing apparatus for checking electronic type current mutual inductor.
Fig. 2 is the structural representation of the utility model portable electronic piece formula current transformer calibration device.
Fig. 3 is the preferred structure schematic diagram of the data processing circuit in the utility model device.
In figure, each label lists as follows:
1-standard current transformer; 2-electronic current mutual inductor to be measured; 3-data processing circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described.
The utility model relates to a kind of portable electronic piece formula current transformer calibration device, for the verification of electronic current mutual inductor 2 to be measured, its structure as shown in Figure 2, comprise pressure regulator, precision resistance, standard current transformer 1, high-current cable, two times transfer device, merge cells and data processing circuit, wherein, the precision of precision resistance is higher than 0.05 grade, pressure regulator output voltage is connected with the secondary side input end of standard current transformer 1 by series connection precision resistance, the voltage at precision resistance two ends by cable leading to data processing circuit, the primary side output terminal of standard current transformer 1 is connected with high-current cable, high-current cable is also connected electronic current mutual inductor 2 to be measured being connected with the primary side input end of electronic current mutual inductor 2 to be measured, secondary side output terminal connecting secondary converter and the merge cells successively of electronic current mutual inductor 2 to be measured, merge cells exports current signal to be measured to data processing circuit, obtain standard current signal divided by precision resistance after the voltage at the precision resistance two ends of reception is carried out analog to digital conversion by data processing circuit and after data syn-chronization with current signal comparison to be measured and then output verification result.
In the specific implementation, by Integration Designs such as pressure regulator, precision resistance and data processing circuits, integrated portable calibration equipment can be formed.Pressure regulator output voltage is between 0 ~ 250V, output power is greater than 200W, pressure regulator output voltage is connected with the secondary side of standard current transformer 1 (or being called benchmark CT) by series connection precision resistance, suitable no-load voltage ratio can be selected by the different modes of connection, the primary side of benchmark CT connects high-current cable (namely heavy-current bus-bars), and connects with electronic current mutual inductor 2 (or being called by school ECT) to be measured.By series connection precision resistance act on standard current transformer 1 secondary side thus at the secondary side input current of standard current transformer 1, and make the primary side of standard current transformer 1 export big current by electromagnetic induction, like this, closed high-current cable is just provided with big current, and this big current is alternating current.Preferably, precision resistance adopts powerful four line precision resistances, and its canonical parameter is, resistance is 0.1 Europe, and power is 10W, and temperature coefficient is better than 5ppm/ DEG C.Big current on closed high-current cable is applied to the primary side input end of electronic current mutual inductor 2 to be measured by electromagnetic induction or Faradic electricity magnetic effect, the light signal that the secondary side output terminal of electronic current mutual inductor to be measured is exported with current information enters two times transfer device, two times transfer device carries out signal receiving and exports digital current information, then exports measured signal to data processing circuit after merge cells completes the format conversion of different digital frame and multichannel merges into the process of a road signal.In conjunction with the requirement of volume and precision, can selection reference CT accuracy higher than 0.05 grade, be preferably 0.02 grade, no-load voltage ratio is 100A ~ 2000A/5A, calibrates the electronic current mutual inductor to be measured 2 of different rated current by selecting suitable no-load voltage ratio to realize.
The preferred structure of data processing circuit as shown in Figure 3, data processing circuit 3 comprises the signal conditioning circuit, AD acquisition chip and the FPGA processor that connect successively, also comprise the photoelectric switching circuit and electro-optical conversion circuit that are all connected with FPGA processor, photoelectric switching circuit is all connected with merge cells with electro-optical conversion circuit.Signal conditioning circuit is introduced the voltage at precision resistance two ends and is carried out the signal condition such as filtering, noise reduction, the voltage at the precision resistance two ends after AD acquisition chip collection conditioning, be sent to FPGA processor after being converted to digital signal, this digital signal is obtained standard current signal divided by precision resistance by FPGA processor.Preferably, AD acquisition chip can adopt the benchmark AD converter of 16, and the accuracy of benchmark AD converter, higher than 0.05 grade, is preferably 0.02 grade, reaches the balance of acquisition precision and speed.FPGA processor with communicate as light signal between merge cells, FPGA processor exports synchronizing pulse to merge cells by electro-optical conversion circuit, it exports synchronizing pulse and can be pulse per second (PPS) or B code, and the data that merge cells sends are connected with FPGA processor by photoelectric switching circuit according to IEC61850-9-1 or IEC61850-9-2 standard communication protocol.FPGA processor forms it primarily of fpga chip and sends synchronizing signal to AD acquisition chip and merge cells, and receive the data of AD acquisition chip and merge cells simultaneously, the data of the AD acquisition chip received are aforesaid digital signal data, this digital signal data process is obtained standard current signal by FPGA processor, the data of the merge cells received are aforesaid current signal data to be measured, FPGA processor after data syn-chronization by the ratio of standard current signal and current signal contrast conting to be measured electronic current mutual inductor to be measured and angular difference, and output verification result, this check results can be used as error and is sent to terminal presentation facility by serial ports or port.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (6)
1. a portable electronic piece formula current transformer calibration device, for the verification of electronic current mutual inductor to be measured, comprise standard current transformer, high-current cable, two times transfer device and merge cells, it is characterized in that, also comprise pressure regulator, precision resistance and data processing circuit, the precision of described precision resistance is higher than 0.05 grade, described pressure regulator output voltage is connected with the secondary side input end of standard current transformer by series connection precision resistance, the voltage at described precision resistance two ends by cable leading to data processing circuit, the primary side output terminal of described standard current transformer is connected with high-current cable, described high-current cable is also connected electronic current mutual inductor to be measured being connected with the primary side input end of electronic current mutual inductor to be measured, secondary side output terminal connecting secondary converter and the merge cells successively of described electronic current mutual inductor to be measured, described merge cells exports current signal to be measured to data processing circuit, obtain standard current signal divided by precision resistance after the voltage at the precision resistance two ends of reception is carried out analog to digital conversion by described data processing circuit and after data syn-chronization with current signal comparison to be measured and then output verification result.
2. portable electronic piece formula current transformer calibration device according to claim 1, it is characterized in that, described data processing circuit comprises the signal conditioning circuit, AD acquisition chip and the FPGA processor that connect successively, described data processing circuit also comprises the photoelectric switching circuit and electro-optical conversion circuit that are all connected with FPGA processor, described signal conditioning circuit introduces the voltage at precision resistance two ends, described photoelectric switching circuit is all connected with merge cells with electro-optical conversion circuit, described FPGA processor output verification result.
3. portable electronic piece formula current transformer calibration device according to claim 1 and 2, is characterized in that, described precision resistance is four line precision resistances.
4. portable electronic piece formula current transformer calibration device according to claim 2, is characterized in that, described FPGA processor exports synchronizing pulse to merge cells by electro-optical conversion circuit, and described synchronizing pulse is pulse per second (PPS) or B code; The data that described merge cells sends are connected with FPGA processor by photoelectric switching circuit according to IEC61850-9-1 or IEC61850-9-2 communication protocol.
5. portable electronic piece formula current transformer calibration device according to claim 2, is characterized in that, described AD acquisition chip is the benchmark AD converter of 16, and the accuracy of described benchmark AD converter is higher than 0.05 grade.
6. the portable electronic piece formula current transformer calibration device according to claim 1 or 2 or 5, is characterized in that, the accuracy of described standard current transformer is higher than 0.05 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520303373.6U CN204719222U (en) | 2015-05-12 | 2015-05-12 | A kind of portable electronic piece formula current transformer calibration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520303373.6U CN204719222U (en) | 2015-05-12 | 2015-05-12 | A kind of portable electronic piece formula current transformer calibration device |
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| CN204719222U true CN204719222U (en) | 2015-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520303373.6U Withdrawn - After Issue CN204719222U (en) | 2015-05-12 | 2015-05-12 | A kind of portable electronic piece formula current transformer calibration device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880686A (en) * | 2015-05-12 | 2015-09-02 | 贵州电力试验研究院 | Device and method for checking portable electronic current transformer |
| CN106324545A (en) * | 2016-10-14 | 2017-01-11 | 哈尔滨理工大学 | Fiber and grating current transformer with nonlinear correction treatment function |
-
2015
- 2015-05-12 CN CN201520303373.6U patent/CN204719222U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880686A (en) * | 2015-05-12 | 2015-09-02 | 贵州电力试验研究院 | Device and method for checking portable electronic current transformer |
| CN104880686B (en) * | 2015-05-12 | 2019-04-26 | 贵州电力试验研究院 | A kind of portable electronic piece formula current transformer calibration device and method |
| CN106324545A (en) * | 2016-10-14 | 2017-01-11 | 哈尔滨理工大学 | Fiber and grating current transformer with nonlinear correction treatment function |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151021 Effective date of abandoning: 20190426 |
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| AV01 | Patent right actively abandoned |