CN104764928A - Portable pulse large-current measurement device suitable for transformer substation sites - Google Patents
Portable pulse large-current measurement device suitable for transformer substation sites Download PDFInfo
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Abstract
A portable pulse large-current measurement device suitable for transformer substation sites comprises a pulse large-current sensor, the pulse large-current sensor is connected with a digitalized processing unit through a shielding line, the output of the digitalized processing unit is in an optical signal mode and is connected with an optoelectronic transmission unit through an optical fiber; the optoelectronic transmission unit is close to a terminal processing unit, input signals of the optoelectronic transmission unit are optical signals, output signals of the optoelectronic transmission unit are electric signals, and the electric signals are connected to the terminal processing unit through a USB transmission line. The portable pulse large-current measurement device suitable for transformer substation sites is high in on-site mobility and capable of performing current measurement on positions to be measured, does not need to stop operating of a measured device, and is high in accuracy.
Description
Technical field
The Portable pulse heavy-current measuring device of a kind of applicable substation field of the present invention, realizes measuring in real time for high frequency big current such as paired pulses high-intensity magnetic field device discharge current, lightning impulse discharge currents.
Background technology
In order to test the performance of various kinds of equipment under high voltage, big current in electric system, especially the performance of the equipment such as mutual inductor, isolating switch under lightning impulse voltage, dash current, need to carry out surge voltage and impulse current test to these equipment, with the requirement of the satisfied regulations such as the insulating property of inspection machine, heat resistance, mechanical property.In impulse magnetic field field, in order to produce the magnetic field of tens of teslas intensity, also needing to discharge produces the pulse high current of dozens or even hundreds of kiloampere.Whether normal in order to judge the duty of surge voltage/current feedback circuit and impulse magnetic field device, whether output signal meets the demands, and must monitor accurately the pulse high current produced in its course of work.In addition, accurate measurements is carried out to the output of this kind of device, comprise and the parameters such as peak value, wave front time, wave rear time, half time to peak are monitored, control device can also be coordinated to be formed and feed back accurately, ensure the various types of signal of this kind equipment accurately needed for output test.
In order to test the pulse high current in surge voltage/current feedback circuit and impulse magnetic field device discharge process accurately, in the urgent need to developing the efficiently pulse high current measuring system of safety.Have many enterprises and scientific research institutions to carry out the research of this respect at present, the pulse high current measuring system that various soft and hardware combines have also been obtained application to a certain degree.When current power equipment carries out pulse high current test, generally carry out in laboratory environments, this test can accurately not reflect on-the-spot situation, although cause equipment to have passed the test in laboratory, but still there will be all kinds of fault when running at the scene, cause the situations such as a mutual inductor guide rod distortion as lightning current.Therefore, at substation field, impulse current test is carried out to power equipment and become a kind of study hotspot.Some scientific research institutions is carrying out the development of the pulse high current generating means of applicable onsite application at present, has achieved certain achievement.Therefore, the pulse high current measurement mechanism that synchronous research is applicable to the pin-point accuracy of onsite application becomes problem demanding prompt solution.
Patent CN1442700A proposes a kind of proving installation and method of nanosecond pulse big current, and this device utilizes photomultiplier test macro to measure discharge current waveform, by the amplitude of Rogowski coil and oscilloscope measurement discharge current.Devise a kind of mixed photoelectric impulse current measurement system in patent CN102539885A, it comprises inductive coil and optical fiber transmission module, can measure microampere order electric current, and Measurement bandwidth can reach 22MHz, and nonlinearity is less than 0.1%.Patent CN103412167A discloses a kind of coaxial Disc Shunt for recurrent pulse current measurement, and this invention solves the not high problem of 1A ~ 100A, 50Hz ~ 200kHz recurrent pulse current measurement accuracy.Patent CN101135702A proposes a kind of impulse current measurement mechanism based on flexible Rogowski coil, adopts Rogowski coil to realize the measurement of pulse current in conjunction with the form of analogue integrator.But, above about the measurement mechanism of pulse high current, be mainly used in the test of pulse high current under laboratory environment, and accuracy is not high, generally only can reach the accuracy of 0.1%, and above-mentioned measurement mechanism cannot realize the self calibration of accuracy at substation field, because just cannot accuracy of measurement be ensured.
Summary of the invention
The accuracy of measurement existed for current pulse high current measurement mechanism is not high, cannot self calibration, be not suitable for the problem of onsite application, the invention provides a kind of Portable pulse heavy-current measuring device of applicable substation field, on-the-spot mobility is strong, can at any time to needing the position measured to carry out current measurement, without the need to interrupting the operation of tested device, accuracy is high.
The technical scheme that the present invention takes is:
A kind of Portable pulse heavy-current measuring device of applicable substation field, comprise pulse high current sensor, pulse high current sensor is connected with digitized processing unit by shielding line, and digitized processing unit exports as light signal form, is connected with photoelectricity transmission unit by optical fiber; Photoelectricity transmission unit is near terminal processing units, and its input signal is light signal, outputs signal as electric signal, and this electric signal to be accessed terminal processing unit by USB transmission line.
Described pulse high current sensor comprises open type Rogowski coil, and open type Rogowski coil, as current sensing unit, is obtained by primary current signal wherein by the output voltage detecting Rogowski coil.Open type Rogowski coil can access without the need to disconnecting measured conductor easily or exit measured conductor, realizes pulse high current accurately and measures.
Described pulse high current sensor comprises main Rogowski coil and two pairs of correcting coils.Main Rogowski coil is used for the detection to measured pulse big current, the two pairs of correcting coils are used for calibrating the position of main Rogowski coil and opening air gap, when ensureing to measure, main Rogowski coil plane orthogonal passes and main Rogowski coil tight closure in measured conductor, measured conductor from main Rogowski coil center, there is not opening air gap, ensure the accuracy of measuring.
Described main Rogowski coil and two pairs of correcting coils all adopt printed circuit board (PCB) (PCB) fabrication techniques to form, and volume is little, weight is no more than 2kg, are very applicable to onsite application.PCB technology ensure that being uniformly distributed of coil neutralization circle, is conducive to reducing external interference.
Described pulse high current sensor, digitized processing unit are all in metal shielding setup, are conducive to the electromagnetic interference (EMI) reducing substation field, reduce measuring error.
Described terminal processing units is industrial computer or notebook computer, for carrying out data analysis, parameter display and data preservation etc. to the signal received.
The Portable pulse heavy-current measuring device of a kind of applicable substation field of the present invention, technique effect is as follows:
1), pulse high current sensor comprises main Rogowski coil and two pairs of correcting coils.Two pairs of correcting coils are utilized to realize the correction of main Rogowski coil accuracy of measurement.Before formal measurement, first two pairs of correcting coils are utilized to correct the installation site of main Rogowski coil and opening air gap, ensure that measured conductor is perpendicular to main Rogowski coil plane and through its center, ensures main Rogowski coil tight closure, thus improve accuracy of measurement.
2), digitized processing unit is installed in metal shielding setup together with pulse high current sensor, effectively can reduce the interference of external electromagnetic field.The signal of main Rogowski coil and two pairs of correcting coils is carried out A/D conversion and becomes digital quantity by digitized processing unit, then carries out framing process through single-chip microcomputer, and by the downward Primary Transmit of optical fiber.Digitized processing unit adopts high-precision 24 A/D converters to realize the digitizing of simulating signal, and digitized signal directly enters single-chip microcomputer and carries out processing and sending.
3) the main Rogowski coil, in pulse high current sensor and two pairs of correcting coils all adopt PCB fabrication techniques to form, and volume is little, lightweight, are very applicable to onsite application.
4), photoelectricity transmission unit receives from the light signal of digitized processing unit, and transmission mode adopts optical fiber.The antijamming capability of Optical Fiber Transmission is strong, ensure that the accuracy of Signal transmissions, reduce the bit error rate because electromagnetic interference (EMI) causes and frame losing phenomenon in substation field.
5), apparatus of the present invention, on-the-spot mobility is strong, can at any time to needing the position measured carry out current measurement, without the need to interrupting the operation of tested device; Accuracy is high, can reach the accuracy of 0.05%.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation.
Fig. 2 is the plan structure schematic diagram of the pulse high current sensor of apparatus of the present invention.
Fig. 3 is the perspective view of the pulse high current sensor of apparatus of the present invention.
Embodiment
As shown in Fig. 1 ~ Fig. 3, a kind of Portable pulse heavy-current measuring device of applicable substation field, is made up of parts such as pulse high current sensor, digitized processing unit 3, photoelectricity transmission unit 4, terminal processing units 5 and metal shielding setup 9.Pulse high current sensor is connected with digitized processing unit 3 by shielding line 6, and digitized processing unit 3 is connected with photoelectricity transmission unit 4 by optical fiber 7, and photoelectricity transmission unit 4 passes through USB transmission line 8 by Signal transmissions to terminal processing units 5.
In the present invention, Rogowski coil is designed to the form of opening, can access without the need to disconnecting measured conductor easily or exit measured conductor, realizes pulse high current accurately and measures.In order to ensure the accuracy of measuring, reduce the error of substation field owing to causing in the situations such as Rogowski coil bias, drift angle, this patent takes following technology.
Described pulse high current sensor is made up of main Rogowski coil 1 and two pairs of correcting coils 2, and as shown in Figure 2 and Figure 3, main Rogowski coil 1 and two pairs of correcting coils 2 all adopt PCB fabrication techniques to form, and ensures the homogeneity of wire turn distribution.Main Rogowski coil 1 is for the detection to measured pulse big current, and the two pairs of correcting coils 2, for calibrating the position of main Rogowski coil and opening air gap, ensure the accuracy of measuring.Two pairs of correcting coils 2 present symmetrical in main Rogowski coil 1, and when Primary Conductor is perpendicular to the plane of main Rogowski coil 1 and by its center, due to symmetry, the output of two pairs of correcting coils is cancelled out each other, and output is zero; If there is the situations such as eccentric in main Rogowski coil 1, then the output of two pairs of correcting coils 2 is non-vanishing, can judge the size of eccentric error according to its output, if error exceedes certain limit, then remind staff to adjust the installation site of pulse high current sensor, ensure that its installation site is correct.When main Rogowski coil 1 is closed not tight, when namely there is opening air gap, can destroy the symmetry of two pairs of correcting coils, its output is non-vanishing, thus can judge that coil is closed not tight, and main Rogowski coil 1 closes by prompting staff again.
The two pairs of correcting coils 2 comprise four independent square coils, and the wire turn distribution on each coil is completely the same, and four independent coils are symmetric in main Rogowski coil 1, and four coils are on four summits of square.The line of every a pair coil plane is by the center of main Rogowski coil 1 plane.
The present invention devises two pairs of correcting coils 2 in the plane of main Rogowski coil 1, by the comparison of these two pairs of coil output signal, before formal measurement, first carry out the self calibration of main coil accuracy, this self calibration mode can make the control errors of whole device within 0.05%.
Pulse high current sensor and digitized processing unit 3 are all in metal shielding setup 9.The central axis of pulse high current sensor and the dead in line of metal shielding setup 9, digitized processing unit 3 is positioned at the side semicircle of metal shielding setup 9, can not have an impact when ensureing folding to circuit wherein.
The light signal that digitized processing unit 3 transmits by photoelectricity transmission unit 4 carries out certain process, and is converted to the electric signal of applicable USB transmission line 8 transmission, transfers to terminal processing units 5 by USB transmission line 8.Terminal processing units 5 is industrial computer or notebook computer, and terminal processing units 5 Main Function is that the data analysis that paired pulses great current sensor exports calculates.
Described digitized processing unit 3 adopts the ADS1216 of 24 as A/D converter, and the analog output of pulse high current sensor is converted to digital quantity accurately, is then transferred to photoelectricity transmission unit 4.Photoelectricity transmission unit 4 adopts HFBR2412 to convert the light signal received to electric signal, and is transmitted by USB transmission line 8.
Described metal shielding setup 9 adopts aluminum alloy materials to be made.As Fig. 1, whole shield assembly is designed to open type, is externally rendered as cylindrical structure, and be made up of two semicylinders, there is opening centre, can be clipped in easily on conductor and measure.
The Portable pulse heavy-current measuring device of a kind of applicable substation field of the present invention, owing to adopting the Rogowski coil of Based PC B technology as pulse high current sensor, have that volume is little, lightweight, advantages of simple structure and simple, be very applicable to onsite application, mobility is strong.Meanwhile, the sensor based on Rogowski coil has measures bandwidth, advantage that dynamic range is large, is applicable to the pulse high current signal measuring high frequency.
Claims (9)
1. the Portable pulse heavy-current measuring device of an applicable substation field, comprise pulse high current sensor, its feature exists, pulse high current sensor is connected with digitized processing unit (3) by shielding line (6), digitized processing unit (3) is connected with photoelectricity transmission unit (4) by optical fiber (7), photoelectricity transmission unit (4) by USB transmission line (8) by Signal transmissions to terminal processing units (5).
2. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 1, it is characterized in that, described pulse high current sensor comprises open type Rogowski coil, open type Rogowski coil, as current sensing unit, is obtained by primary current signal wherein by the output voltage detecting Rogowski coil.
3. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 1, it is characterized in that, described pulse high current sensor comprises main Rogowski coil (1) and two pairs of correcting coils (2), main Rogowski coil (1) is for the detection to measured pulse big current, and the two pairs of correcting coils (2) are for calibrating the position of main Rogowski coil (1) and opening air gap.
4. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 3, it is characterized in that, described two pairs of correcting coils (2) comprise four independent square coils, wire turn distribution on each coil is completely the same, and four independent square coils are symmetric in main Rogowski coil (1), four independent square coils are on four summits of square.
5. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 3, it is characterized in that, described main Rogowski coil (1), two pairs of correcting coils (2) all adopt printed circuit board (PCB) (PCB) fabrication techniques to form.
6. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 1, it is characterized in that, described pulse high current sensor, digitized processing unit (3) are all in metal shielding setup (9).
7. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 1, it is characterized in that, described metal shielding setup (9) is open type structure.
8. the Portable pulse heavy-current measuring device of a kind of applicable substation field according to claim 1, it is characterized in that, described terminal processing units (5) is industrial computer or notebook computer.
9. any one Portable pulse heavy-current measuring device as described in claim 1 ~ 8, is characterized in that, the high frequency big current for paired pulses high-intensity magnetic field device discharge current or lightning impulse discharge current is measured in real time.
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| CN106645861A (en) * | 2017-02-17 | 2017-05-10 | 三峡大学 | Online verifying system for current transformer based on novel pincer-like Rogowski coil |
| CN106771477A (en) * | 2016-11-28 | 2017-05-31 | 国网福建省电力有限公司 | The highly sensitive high voltage direct current cable leakage current detection sensor of New Large Caliber |
| CN106950525A (en) * | 2017-03-17 | 2017-07-14 | 中国科学院电工研究所 | A kind of pulse low current calibrating installation |
| CN113167819A (en) * | 2018-11-27 | 2021-07-23 | 菲尼克斯电气公司 | Position compensated current measuring device |
| EP4261548A1 (en) * | 2022-04-14 | 2023-10-18 | Hager-Electro Sas | Calibration method, calibration installation and method for assembling a current sensor for switchgear, associated current sensor |
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| EP4261548A1 (en) * | 2022-04-14 | 2023-10-18 | Hager-Electro Sas | Calibration method, calibration installation and method for assembling a current sensor for switchgear, associated current sensor |
| FR3134633A1 (en) * | 2022-04-14 | 2023-10-20 | Hager-Electro Sas | Calibration method, calibration installation and assembly method of a current sensor for electrical switching equipment, associated current sensor |
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Inventor after: Huang Yuehua Inventor after: Li Zhenhua Inventor after: Yan Suhong Inventor after: Zhao Shuang Inventor after: Li Qiuhui Inventor after: Li Zhenxing Inventor after: Xu Yanchun Inventor before: Li Zhenhua Inventor before: Yan Suhong Inventor before: Huang Yuehua Inventor before: Li Zhenxing Inventor before: Xu Yanchun |
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Effective date of registration: 20210325 Address after: 443100 No.10 Pinghu Avenue, Yiling District, Yichang City, Hubei Province Patentee after: Yichang light source Electric Co.,Ltd. Address before: 443002 No. 8, University Road, Yichang, Hubei Patentee before: CHINA THREE GORGES University |