CN102012448B - Rogowski current sensor - Google Patents
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- CN102012448B CN102012448B CN2010105197840A CN201010519784A CN102012448B CN 102012448 B CN102012448 B CN 102012448B CN 2010105197840 A CN2010105197840 A CN 2010105197840A CN 201010519784 A CN201010519784 A CN 201010519784A CN 102012448 B CN102012448 B CN 102012448B
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Abstract
The invention relates to a Rogowski current sensor, which comprises an outer shielding structure, an annular magnetic medium framework, and a first coil and a second coil independently wound on the annular magnetic medium framework respectively. The first coil has more number of turns than the second coil; the first coil and the second coil are respectively connected in parallel with a first integral resistor and a second integral resistor with corresponding resistance; the first integral resistor and the second integral resistor are provided with a corresponding signal-measuring output end respectively; and the second integral resistor is connected in parallel with a transient voltage suppression diode. In a coil structure, by winding different turns of coils on the annular magnetic medium framework, the sensor measures a current signal in a wider amplitude range; and due to the mode that the second integral resistor is connected in parallel with the transient voltage suppression (TVS) diode, the export voltage at two ends of the second integral resistor is limited when heavy current passes through the coil, and the reliability of the sensor is improved.
Description
Technical field
The present invention relates to the high voltage measuring technology, relate in particular to a kind of Rogowski (Rogowski) current sensor.
Background technology
Rogowski coil be a kind of hollow or the band magnetic core toroid winding, working mechanism is an electromagnetic induction principle, can directly be enclosed within the alternating current of measuring on the measured conductor through conductor.The measurement range of this coil from several milliamperes to the hundreds of kilo-ampere, can satisfy different measurement requirement.It is wide that Rogowski coil has suitable frequency, and it is wide to measure amplitude, and the linearity is good, is easy to demarcate, and do not have with the primary circuit advantage such as to be electrically connected.Therefore, extremely application prospects is all arranged in a lot of fields, electric energy quality monitoring for example, the rectifier monitoring, monitoring etc. is put in office.
In the prior art, big electric current of independent measurement and little electric current based on the survey sensor of Rogowski coil comparative maturity.But these current sensors can only be measured single amplitude range current signal preferably.If current amplitude changes greatly, then be difficult in and carry out perfect measurement in the whole experiment.
Summary of the invention
The objective of the invention is to propose a kind of Rogowski current sensor, can measure the current signal of amplitude range with broad.
For realizing above-mentioned purpose, the invention provides a kind of Rogowski current sensor, comprising:
The exterior shield structure;
Annular magnetic medium skeleton;
Independently be wound on first coil and second coil of said annular magnetic medium skeleton respectively, said first coil has than the more number of turns of said second coil;
Said first coil and second coil are parallel with the first integral resistance and the second integral resistance of corresponding resistance respectively;
Said first integral resistance and second integral resistance have corresponding measuring-signal output terminal respectively;
Said second integral resistance also is parallel with transient voltage and suppresses diode.
In the present embodiment; In coil structure, pass through coil at the different number of turns of annular magnetic medium skeleton coiling; Sensor is realized the more measurement of the current signal of wide cut value scope; And through the mode at second integral resistance parallel connection TVS, the outlet voltage at coil restriction second integral resistance two ends during through big electric current is in order to avoid because of inducing the safety that high voltage threatens back grade surveying instrument.
Preferably, the coil turn of said first coil: 100～1000 circles, integrating resistor: 0.1～10 Ω, range of current is about: 100A～tens kA; The number of turns of said second coil: 1～100 circle, integrating resistor: 10～1000 Ω, range of current is about: 1mA～tens A.Number of turns through big current coil is more, and corresponding integrating resistor is less; Number of turns through less current coil is less, and corresponding integrating resistor is bigger.
Preferably, the resistance of the first integral resistance corresponding with said first coil is 0.1～10 Ω, and the resistance of the second integral resistance corresponding with said second coil is 10～1000 Ω.
Preferably, said annular magnetic medium skeleton is the solid loop configuration that nickel-Zinc ferrite material is processed.Compare with common magnetic core such as MnZn ferrite material; Because the relative initial permeability of nickel-Zinc ferrite material is lower; Can in 10kHz～300MHz scope, use (manganese-zinc ferrite frequency of utilization scope is about: 1kHz～10MHz), thus enlarged the service band of sensor of the present invention.
Further; The metallic shield box that said exterior shield structure is a loop configuration; The said toroidal cores of in said metallic shield box, held coiling first coil and second coil, first integral resistance, second integral resistance and transient voltage suppress diode, and the periphery of said metallic shield box is provided with the narrow slit structure.The metallic shield box holds the main working parts of sensor, can prevent extraneous electromagnetic interference (EMI), and the narrow slit structure can provide coupling path for the magnetic field of primary side current.
The shielding box of employing metal material can realize preventing the function of electromagnetic interference (EMI), for example adopts the lower metals of magnetic permeability such as aluminium or copper.
Further, the spacing of the neighboring edge of said first coil and second coil is the girth of 1/4 times said annular magnetic medium skeleton.First coil and second coil be coiling separately all, can not overlap, and require to keep the space length of at least 1/4 girth.
Preferably, said spacing is the girth of 1/4 times said annular magnetic medium skeleton.
Preferably, said first integral resistance and second integral resistance adopt noninductive resistance.Owing to measure the inductance that fast-changing electric current need reduce integrating resistor; The stray inductance of conventional, electric-resistance is bigger; During integration bigger vibration can take place, can not better reduce the primary current signal, the measuring frequency band of sensor and precision all can be affected; Therefore adopt noninductive resistance then can better reduce the primary current signal, guarantee the measuring frequency band and the precision of sensor.
Based on technique scheme; The embodiment of the invention is passed through the coil at the different number of turns of annular magnetic medium skeleton coiling in coil structure; Sensor is realized the more measurement of the current signal of wide cut value scope; Solved the common current sensor and can only measure the more limited problem of range of application that single amplitude range current signal is caused, and through mode, outlet voltage at coil restriction second integral resistance two ends during through big electric current at second integral resistance parallel connection TVS; In order to avoid, improved the reliability of sensor because of inducing the safety that high voltage threatens back level surveying instrument.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of an embodiment of Rogowski current sensor of the present invention.
Fig. 2 tests the square wave response curve synoptic diagram of the less electric current of 28mA for adopting Rogowski current sensor embodiment of the present invention.
Fig. 3 tests the pulse respond synoptic diagram of the less electric current of 28mA for adopting Rogowski current sensor embodiment of the present invention.
Fig. 4 is for adopting the pulse respond synoptic diagram of the big electric current (5kA, 8/20 μ s normalized current ripple) of Rogowski current sensor embodiment test of the present invention.
Embodiment
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
As shown in Figure 1, be the structural representation of an embodiment of Rogowski current sensor of the present invention.In the present embodiment; The Rogowski current sensor comprises annular magnetic medium skeleton 1; On annular magnetic medium skeleton 1 respectively independent coiling the first coil 2-1 and the second coil 2-2; Wherein the first coil 2-1 has the more number of turns than the second coil 2-2; Two ends at the enameled wire that constitutes the first coil 2-1 are parallel with first integral resistance 5-1, are parallel with second integral resistance 5-2 at the two ends of the enameled wire that constitutes the second coil 2-2, and the resistance of first integral resistance 5-1 and second integral resistance 5-2 is set according to the first coil 2-1 and the second coil 2-2 respectively.First integral resistance 5-1 has corresponding measuring-signal output terminal 6-1, can link to each other with the input channel of one of oscillograph, and second integral resistance 5-2 has corresponding measuring-signal output terminal 6-2, can link to each other with oscillographic another input channel.
Two ends at second integral resistance can also suppress diode (Transient Voltage Suppressor is called for short TVS) 4 by parallelly connected transient voltage.For fear of the electromagnetic interference (EMI) of outside, exterior shield structure 3 can be set outside above-mentioned parts.
In the present embodiment; In coil structure, pass through coil at the different number of turns of annular magnetic medium skeleton coiling; Sensor is realized the more measurement of the current signal of wide cut value scope; And utilize two detection signal output terminals, and connect oscillographic two input channels, can show the signal waveform of the electric current of different sizes.
At coil of skeleton on coiling, according to the sensitivity of the electric current of its detection, the number of turn of coiling and the resistance of integrating resistor are different in the structure of Rogowski current sensor in the prior art.In the present embodiment on skeleton respectively independent coiling the coil of two different number of turns; The amplitude range of the electric current of its detection has just covered the amplitude range of the Rogowski current sensor of two kinds of single coils that adopt different number of turns; And because shared annular magnetic medium skeleton and exterior shield structure have also reduced manufacturing cost.
In order to make Rogowski current sensor of the present invention possess the amplitude range of broad, the number of turns of first coil is 100～1000 circles, is fit to measure the big electric current of range of current at 100A～tens kA; The number of turns of second coil is 1～100 circle, is fit to measure range of current at 1mA～little electric current of tens A.Because the number of turn of first coil is more, no-load voltage ratio is bigger, so sensitivity is less; And the number of turn of second coil is less, and no-load voltage ratio is less, so sensitivity is bigger.For first coil of measuring big electric current, the resistance of its pairing first integral resistance is 0.1～10 Ω, and for second coil of measured current, the resistance of its pairing second integral resistance is 10～1000 Ω.
The parallel connection TVS at the two ends of second integral resistance can be at the outlet voltage at coil restriction second integral resistance two ends during through big electric current, in order to avoid because of inducing the safety that high voltage threatens back grade surveying instrument.
The cross section of annular magnetic medium skeleton can be square, is convenient to make and coiling.Its material can be selected organic glass or common magnetic core for use, the solid loop configuration that preferred nickel-Zinc ferrite material is processed.It is fit to and the higher occasion of frequency because the magnetic permeability of nickel-Zinc ferrite material is lower, and resistance is bigger.
The exterior shield structure can be selected the metallic shield box of loop configuration for use; Said toroidal cores, first integral resistance, second integral resistance and the TVS of in the metallic shield box, held coiling first coil and second coil, the periphery of metallic shield box is provided with the narrow slit structure.The metallic shield box holds the main working parts of sensor, can prevent extraneous electromagnetic interference (EMI).The narrow slit structure is when primary side current passes the sensor axis, produces magnetic field on the plane of vertical current direction, and this magnetic field is passed said narrow slit structure and on the coil of sensor, induced voltage, and this narrow slit structure is that primary side current provides coupling path.The metallic shield box can adopt the higher metal of conductance commonly used, for example aluminium, copper etc.
First coil and second coil be coiling separately all, can not overlap, and require the certain space length of maintenance, and the spacing of the neighboring edge of first coil and second coil is chosen as 1/4 girth.Preferably, said spacing is the girth of 1/4 times said annular magnetic medium skeleton.When adopting the spacing of 1/4 girth, the current signal frequency band broad that second coil is responded to, performance is more excellent, and if when selecting other spacing, its frequency band and performance all are adversely affected.
Preferably, first integral resistance and second integral resistance can adopt noninductive resistance.Owing to measure the inductance that fast-changing electric current need reduce integrating resistor; The stray inductance of conventional, electric-resistance is bigger; During integration bigger vibration can take place, can not better reduce the primary current signal, the measuring frequency band of sensor and precision all can be affected; Therefore adopt noninductive resistance then can better reduce the primary current signal, guarantee the measuring frequency band and the precision of sensor.If mainly test low-frequency current, then also can adopt conventional, electric-resistance as integrating resistor.
Two measuring-signal output terminals of Rogowski current sensor embodiment of the present invention can adopt engineering to use modular connection, and for example Q9 joint etc. can pass through cable and oscillographic input channel well matched.Before test, regulate triggering level to correct position.Measuring-signal output terminal 6-1 in Fig. 1 is the output terminal of big electric current, its sensitivity less (for example 5V/A), and measuring-signal output terminal 6-2 is the output terminal of less electric current, its sensitivity is big (for example 0.005V/A).The measured signal lead is passed hub of a spool, and when little electric current passed through, test signal output terminal 6-2 output less current signal showed corresponding waveform on oscillograph; And this moment test signal output terminal 6-1 because sensitivity is low, export almost nilly, oscillograph can't be measured, so in demonstration, do not have waveform or waveform not obvious.When big electric current passed through, the current signal that test signal output terminal 6-1 output is bigger was fit to oscilloscope measurement; So on oscillograph, show corresponding waveform; And the sensitivity of test signal output terminal 6-2 is higher, and the pulse signal of its output can be very big, causes the damage of surveying instrument easily; Therefore the voltage magnitude that limits output through parallelly connected TVS is the voltage stabilizing value of TVS pipe, avoids the damage of surveying instrument.
Fig. 2 and Fig. 3 are two concrete test cases of Rogowski current sensor embodiment of the present invention.Wherein, Fig. 2 is the square wave response curve synoptic diagram of the less electric current of test (28mA), and wherein curve 1 is represented shunt, the little current coil of curve 2 expressions; Fig. 3 is the pulse respond synoptic diagram of the less electric current of test (28mA), and wherein curve 1 is represented shunt, the little current coil of curve 2 expressions; Fig. 4 is the pulse respond synoptic diagram of the big electric current (5kA, 8/20 μ s normalized current ripple) of test, and wherein curve 1 is represented big current coil, curve 2 expression shunts.
Fig. 2 shows that the rising edge of the square wave response curve of less electric current and negative edge response time are all short than the shunt response time, explain that the coil high frequency performance is better; The response flat-top of while square wave response curve falls very little, explains that its low frequency characteristic is also better; Vibration and overshoot do not appear near this external rising edge and the negative edge yet.Fig. 3 shows that the rising edge of little current impulse response curve and negative edge response time are all short than the shunt response time, explain that the coil high frequency performance is better.Simultaneously at pulse wave rear place overshoot and vibration do not appear yet.
Among Fig. 4, the big current coil number of turn is 200 circles, and integrating resistor 1 Ω is so theoretical sensitivity is H=1/200=0.005.Demarcate big current coil sensitivity and adopt standard shunt; The shunt resistance value is 0.001824 Ω; This moment, the shunt output voltage values was 9.9V, and big current coil output voltage values is 27.1V, and it is very approaching with theoretical sensitivity that the sensitivity of historical facts or anecdotes border then is
; The test 8/20 μ s normalized current ripple that big electric current is described ends; Positive negative peak overlaps basically, and nothing differs, and waveform response is good.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of programmed instruction; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (8)
1. Rogowski current sensor comprises:
The exterior shield structure;
Annular magnetic medium skeleton;
Independently be wound on first coil and second coil of said annular magnetic medium skeleton respectively, said first coil has than the more number of turns of said second coil;
Said first coil and second coil are parallel with the first integral resistance and the second integral resistance of corresponding resistance respectively;
Said first integral resistance and second integral resistance have corresponding measuring-signal output terminal respectively;
Said second integral resistance also is parallel with transient voltage and suppresses diode.
2. Rogowski current sensor according to claim 1, the number of turns of wherein said first coil are 100～1000 circles; The number of turns of said second coil is 1～100 circle.
3. Rogowski current sensor according to claim 2, the resistance of wherein corresponding with said first coil first integral resistance is 0.1～10 Ω, the resistance of the second integral resistance corresponding with said second coil is 10～1000 Ω.
4. Rogowski current sensor according to claim 1, wherein said annular magnetic medium skeleton is the solid loop configuration that nickel-Zinc ferrite material is processed.
5. Rogowski current sensor according to claim 1; The metallic shield box that wherein said exterior shield structure is a loop configuration; The said annular magnetic medium skeleton of in said metallic shield box, held coiling first coil and second coil, first integral resistance, second integral resistance and transient voltage suppress diode, and the periphery of said metallic shield box is provided with the narrow slit structure.
6. Rogowski current sensor according to claim 1, the spacing of the neighboring edge of wherein said first coil and second coil are at least the girth of 1/4 times said annular magnetic medium skeleton.
7. Rogowski current sensor according to claim 6, wherein said spacing are the girth of 1/4 times said annular magnetic medium skeleton.
8. according to claim 1 or 3 described Rogowski current sensors, wherein said first integral resistance and second integral resistance adopt noninductive resistance.
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| CN103105515A (en) * | 2011-11-14 | 2013-05-15 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Processing equipment of current sensor, impedance matching device and plasma |
| CN102508137A (en) * | 2011-12-23 | 2012-06-20 | 保定天威集团有限公司 | Partial discharge detection pulse current sensor with self correcting function |
| CN103235169A (en) * | 2013-04-25 | 2013-08-07 | 国家电网公司 | Measuring device for pre-discharging current before insulation breakthrough at VFTO (very fast transient overvoltage) |
| CN103389423A (en) * | 2013-07-23 | 2013-11-13 | 山西乐普节能技术有限公司 | Power quality analyzer |
| GB201400197D0 (en) * | 2014-01-07 | 2014-02-26 | Power Electronic Measurements Ltd | High bandwidth rogowski transducer with screened coil |
| CN104914288B (en) * | 2015-06-02 | 2018-07-10 | 北京市燃气集团有限责任公司 | A kind of lightning current measuring coil and design method |
| CN105301323B (en) * | 2015-09-23 | 2018-10-30 | 红相股份有限公司 | The method that UHVDC Arrester Leakage Current is detected online using cloud |
| CN105182162B (en) * | 2015-09-23 | 2018-12-07 | 红相股份有限公司 | It is core to the acquisition unit of contactless faint leakage current signal using diskette |
| CN105158543B (en) * | 2015-09-23 | 2018-10-30 | 红相股份有限公司 | Based on double Hall elements to the collecting unit of UHVDC Arrester leakage current |
| CN105301325B (en) * | 2015-09-23 | 2018-10-30 | 红相股份有限公司 | With hall sensing theory to the method for UHVDC Arrester leakage current collection |
| FR3108987B1 (en) * | 2020-04-02 | 2022-04-08 | Safran Electrical & Power | Fast Rogowski type current sensor immune to voltage drifts |
| CN112034231B (en) * | 2020-07-21 | 2022-10-25 | 华北电力大学 | High-frequency current sensor based on frequency-dependent integral resistor |
| CN113917214B (en) * | 2021-09-22 | 2023-10-27 | 中国船舶工业***工程研究院 | Self-integration Rogowski coil disc-shaped integration resistor and manufacturing method thereof |
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| DE69802203T2 (en) * | 1997-04-21 | 2002-06-27 | Arbeitsgemeinschaft Prof Dr J | DEVICE WITH A BANDPASS WIDE BANDWIDTH FOR MEASURING ELECTRICAL CURRENT STRENGTH IN ONE LADDER |
| CN1731194A (en) * | 2005-08-08 | 2006-02-08 | 西安交通大学 | Differential Rogowski coil for steep pulse small current measurement |
| US20090243590A1 (en) * | 2008-04-01 | 2009-10-01 | Stephen James West | System and method for monitoring current in a conductor |
| CN101557173B (en) * | 2009-01-21 | 2011-09-14 | 华中科技大学 | Single-core differential current transformer power supply |
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