CN105448453B - A kind of Rogowski coil based on coaxial cable skeleton - Google Patents
A kind of Rogowski coil based on coaxial cable skeleton Download PDFInfo
- Publication number
- CN105448453B CN105448453B CN201610019316.4A CN201610019316A CN105448453B CN 105448453 B CN105448453 B CN 105448453B CN 201610019316 A CN201610019316 A CN 201610019316A CN 105448453 B CN105448453 B CN 105448453B
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- rogowski coil
- coaxial cable
- coil
- terminal
- enamel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/06—Insulation of windings
Abstract
The invention discloses a kind of Rogowski coil based on coaxial cable skeleton, to remove the coaxial cable of screen layer as skeleton, using the cored wire of coaxial cable as the line that unrolls, with enamel-covered wire, uniform coiling is formed on skeleton, and obtained coil is placed in insulating sleeve.Integral unit uses active differential integrator circuit, is powered by external power supply unit, can effectively expand the measurement frequency band of Rogowski coil, and the current differential signal that Rogowski coil is exported is reduced；Signal processing unit is carried out data transmission by output interface circuit to protection passage and metering system.The coil of the present invention is flexible, and with opening, it can be suitably used for various complicated application places, and it is with low cost, it is simple to manufacture, it is easy to accomplish volume production and uniformity is good, can be to the high accuracy measurement of steady-state signal and to the quick response of transient signal, nanosecond amplitude pulse current can be measured, and with good temperature stability and anti-vibration characteristic.
Description
Technical field
The invention belongs to technical field of pulse power, more particularly, to a kind of based on coaxial cable skeleton
Rogowski coil.
Background technology
Rogowski (Rogowski) coil is also known as hollow mutual inductor (Air Coil Transformer) or magnetic potentiometer
(Potentiometer), due to its with tested current loop without directly making electrical contact with, bandwidth, power output is low, simple in construction,
Linear characteristic is good, and is easy to communicate with computer, as big electricity of heterogeneity such as the exchange of high pressure in-site measurement, transient state and pulses
The preferred Sensitive Apparatus of stream.Rogowski coil can be divided into from two kinds of integration type and outer integration type, the pressure in the all-in resistance of loop
When drop is far smaller than the pressure drop on self-induction of loop, Rogowski coil is operated in from integrating state, from integration type Rogowski lines
Circle is generally operational in measurement high frequency or dash current occasion；When the voltage on self-induction of loop is far smaller than the electricity in the all-in resistance of loop
During pressure, Rogowski coil is operated in outer integral mode, now needs the side using external integrating network or outside integration
Formula recovers primary signal.
Traditional magnetic-core type Rogowski coil is influenceed by magnetic core, there are problems that frequency band it is narrow, simultaneously because
Influence of the magnetic core to volume, limits its use condition；Magnetic saturation problem, and measurement frequency band is not present in hollow Rogowski coil
Width, range of dynamic measurement is big, simple in construction, small volume, lightweight, low cost, but also has the shortcomings that very important, such as toughness
Low, output signal is small, and signal to noise ratio is low.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of based on coaxial cable skeleton
Rogowski coil, measurement frequency band is wider, and volume is smaller, can obtain broader frequency in the case where not increasing winding volume
Rate measurement range.
To achieve the above object, the invention provides a kind of Rogowski coil, it is characterised in that including removing screen layer
Coaxial cable and enamel-covered wire；The enamel-covered wire is wrapped on the coaxial cable, and one end composition of the enamel-covered wire is described
The first terminal of Rogowski coil, the other end connects one end of the center conductor of the coaxial cable, the coaxial cable
The other end of center conductor draws the second terminal for constituting the Rogowski coil；The center conductor of the coaxial cable is constituted
The loop line of the Rogowski coil.
Preferably, the coaxial cable and the enamel-covered wire are placed in insulating sleeve, and the of the Rogowski coil
One terminal and second terminal are drawn out of described insulating sleeve, are fixed by structure firmware.
Preferably, the first input that the structure firmware includes electrical fitting and is arranged on the electrical fitting
End, the second input and output end, the first terminal and second terminal of the Rogowski coil are defeated by described first respectively
Enter end and second input introduces the electrical fitting, and by being arranged on the first input end and described second defeated
The buckle for entering end is fixed, and the first terminal and second terminal of the Rogowski coil are whole by electrical fitting progress
Close, drawn as twisted-pair cable from the output end.
Preferably, the enamel-covered wire is copper enamel-covered wire.
In general, by the contemplated above technical scheme of the present invention compared with prior art, with following beneficial effect
Really：Coaxial cable is chosen as around core material, volume is not only reduced, simplifies winding process, reduce cost of manufacture, also make
Obtain coil has good suppleness in itself, is easy to bending, while also there is corresponding intensity to ensure to deform around wire turn, easily
In batch production, and with preferable uniformity, it can be suitably used for various complicated application scenarios；Simultaneously as employing coaxial electrical
The center conductor of cable directly serves as the wrap around type structure for the line that unrolls so that coil is resisted in extraneous magnetic interference with good
Ability.The present invention can expand Rogowski coil under conditions of the distributed constant for ensureing Rogowski coil is unaffected
Measurement range, while do not influence the measurement to transient current, improves the economy of Rogowski coil, stability and is applicable
Property.
Brief description of the drawings
Fig. 1 is the winding mode schematic diagram of the Rogowski coil of the embodiment of the present invention；
Fig. 2 is the measuring principle schematic diagram of the Rogowski coil of the embodiment of the present invention；
Fig. 3 is the structure firmware schematic diagram of the Rogowski coil of the embodiment of the present invention；
Fig. 4 is the integral unit structural representation of the Rogowski coil of the embodiment of the present invention；
Fig. 5 is the Longitudinal cross section schematic of the Rogowski coil of the embodiment of the present invention；
Fig. 6 is the cross-sectional view of the Rogowski coil of the embodiment of the present invention；
Fig. 7 is the linearity test curve of the Rogowski coil of the embodiment of the present invention；
Fig. 8 is the Rogowski coil and the testing current curve comparison figure of normalized current probe of the embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
As depicted in figs. 1 and 2, the Rogowski coil of the embodiment of the present invention includes removing the He of coaxial cable 1 of screen layer
Enamel-covered wire 2.The uniform winding of enamel-covered wire 2 is on coaxial cable 1, and one end of enamel-covered wire 2 constitutes the first terminal of Rogowski coil,
One end of the center conductor of the other end connecting coaxial cable 1 of enamel-covered wire 2, the other end of the center conductor of coaxial cable 1 is drawn
Constitute the second terminal of Rogowski coil.By this connected mode, the center conductor of coaxial cable 1 is set to constitute Rogowski
The loop line 4 of coil, loop line 4 is located at the center per circle enamel-covered wire 2, is formed along the circular windback coil of any closed surface, can had
Effect avoids the interference of external magnetic field.
Specifically, the ring shaped conductor that coaxial cable 1 is wrapped up by flexible insulating material is constituted, and its cross section is circle；Enamel-cover
Line 2 is copper enamel-covered wire.
Coaxial cable 1 and enamel-covered wire 2 are placed in insulating sleeve, the first terminal and second terminal of Rogowski coil from
Draw, be fixed by structure firmware 3 in insulating sleeve.As shown in figure 3, package unit uses plug-in structure, structure is solid
Part 3 includes electrical fitting and the first input end, the second input and the output end that are arranged on electrical fitting, Rogowski
The first terminal and second terminal of coil introduce electrical fitting by first input end and the second input respectively, and by setting
The buckle put in first input end and the second input is fixed, and the first terminal and second terminal of Rogowski coil pass through electric
Connector is integrated, as twisted-pair cable, to reduce interfering between outside electromagnetic interference and wire, twisted-pair cable
Drawn from output end.Structure firmware 3 can carry out assembling fixation by bolt.
As shown in Fig. 2 the twisted-pair cable drawn from output end bridges sampling resistor 5, for Rogowski coil
Induced-current rate of change is sampled, and the measurement of electric current, outer integration Rogowski are can be directly used for from integration Rogowski coil
Coil carries out signal transacting by subsequent process circuit 6.For example, being reduced to measure to sampled signal by outer integral unit
Electric current to be measured, as shown in figure 4, outer integral unit uses active differential integrator circuit, is powered by two grades of power supply unit of voltage regulation,
The measurement frequency band of Rogowski coil can effectively be expanded.Specifically, the voltage signal that Rogowski coil is obtained is passed through double
Strand cable is sent to amplifier and is amplified processing, then after outer integral unit is reduced, it is handled by peak value sampling
Afterwards, it is sent in A/D converter, by transformation result storage into SCM system, carries out data processing, finally display includes tested
Significant data including current values.
The longitudinal section of the Rogowski coil of the embodiment of the present invention is as shown in figure 5, the weighted geometric of Rogowski coil is put down
Equal radius r is represented by：
The distribution capacity C of Rogowski coilC, self-induction LC, optimum terminations resistance RSoptIt can be expressed as：
Wherein, ε is the dielectric constant of capacitor dielectric, with permittivity of vacuum (permittivity of vacuum) ε0Exemplified by, ε0=8.85
×10-12F/m, μ are air magnetic conductivity, π × 10 of μ=4-7H/m, n are the number of turn of enamel-covered wire, RCFor the internal resistance of Rogowski coil,
A is the internal diameter of Rogowski coil, and b is the external diameter of Rogowski coil.
The electromagnetic parameter and structural parameters of Rogowski coil influence the dynamic characteristic of Rogowski coil by final, and are
Ensure the optimum terminations resistance R of Rogowski coilSoptValue it is meaningful, it is necessary to meet condition 2LC>R2 CCC, and require wire
Sectional uniform and by the uniform coiling of small wire turn.
As shown in Fig. 2 Rogowski coil carries out the measurement of current signal based on Ohm's law and the law of electromagnetic induction, carry
Current conductor passes through the center of Rogowski coil, and perpendicular to the plane where Rogowski coil, it is fixed according to Ampere ring road
Reason derives the relation between electric current to be measured and Rogowski coil output signal, it can be deduced that the final output of Rogowski coil
Voltage is：
Wherein, the physical dimension of mutual inductance parameter M and Rogowski coil, the number of turn of coiling and bone used in Rogowski coil
The magnetic conductivity of frame core is relevant, for the Rogowski coil made, and its mutual inductance parameter is definite value.
When the length of current－carrying conductor relative to the size of Rogowski coil has incomparable property, i.e., do not consider that current-carrying is led
During the edge effect in body end portion, its mutual inductance parameter M is：
When coiling line footpath d and coiling radius r can compare, it is necessary to correct the calculation formula of mutual inductance.Examined as shown in fig. 6, working as
When considering the presence of coiling, the couples magnetic flux area per circle coiling will become big, and it is r ' (r ' that the rounded face for being r from radius, which is changed into radius,
=r+d) rounded face.Limit of integration will be by from a to b, being changed into from a ' to b ', therefore revised mutual inductance parameter M' is：
Each unit module is correctly connected on request, said apparatus is constituted, and choose the skeleton radius 2.5mm layer that deshields
The class of insulation that coaxial cable and coiling line footpath are 0.3mm is the copper enamel-covered wire of technical grade, composition internal diameter a=35mm, external diameter b
=41mm Rogowski coil, number of turns n=604 can obtain the self-induction L of coil by formula (1), (2) and (3)C=34.62 μ
H, distribution capacity CC=8.7nF, sampling resistor RS=51 Ω, package unit weighs about 27.8g.
A whole set of Rogowski coil device has carried out linearity test, and and normalized current based on 20kJ impulse power electrical sources module
Probe is compared.The charging voltage of experiment energy-storage capacitor is changed to 1500V from 500V, and a survey is used as at interval of 250V
Pilot, takes 5 magnitude of voltage points and is tested altogether, and each voltage class is tested 20 times, and its test result is as shown in Figure 7 and Figure 8.
Test shows that above-mentioned Rogowski coil shows the good linearity, and pops one's head in measured waveform registration very with normalized current
It is high.
In summary, the Rogowski coil based on coaxial cable skeleton that the present invention is provided, because it chooses coaxial electrical
Cable not only reduces volume as around core material, simplifies winding process, reduces cost of manufacture, also coil is had in itself
There is certain suppleness, be easy to bending, while also having corresponding intensity to ensure to deform around wire turn, can be suitably used for various
Complicated application scenario, batch making has preferable uniformity, simultaneously as the center conductor for employing coaxial cable is direct
Serve as the wrap around type structure for the line that unrolls so that coil is in extraneous magnetic interference with good defensive ability/resistance ability.The present invention can be
Under conditions of ensureing that Rogowski coil distributed constant is unaffected, expand the measurement range of Rogowski coil, while not shadow
The measurement to transient current is rung, the economy, stability and applicability of Rogowski coil is improved.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (3)
1. a kind of Rogowski coil, it is characterised in that coaxial cable and enamel-covered wire including removing screen layer；The enamel-covered wire
It is wrapped on the coaxial cable, one end of the enamel-covered wire constitutes the first terminal of the Rogowski coil, the other end connects
One end of the center conductor of the coaxial cable is connect, the other end of the center conductor of the coaxial cable is drawn described in composition
The second terminal of Rogowski coil；The center conductor of the coaxial cable constitutes the loop line of the Rogowski coil；
The coaxial cable and the enamel-covered wire are placed in insulating sleeve, the first terminal of the Rogowski coil and second
Terminal is drawn out of described insulating sleeve, is fixed by structure firmware.
2. Rogowski coil as claimed in claim 1, it is characterised in that the structure firmware includes electrical fitting and set
First input end, the second input and output end on the electrical fitting are put, the first of the Rogowski coil is whole
End and second terminal introduce the electrical fitting by the first input end and second input respectively, and by setting
The buckle put in the first input end and second input is fixed, the first terminal of the Rogowski coil and second
Terminal is integrated by the electrical fitting, is drawn as twisted-pair cable from the output end.
3. the Rogowski coil as any one of claim 1 to 2, it is characterised in that the enamel-covered wire is copper paint
Envelope curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610019316.4A CN105448453B (en) | 2016-01-13 | 2016-01-13 | A kind of Rogowski coil based on coaxial cable skeleton |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610019316.4A CN105448453B (en) | 2016-01-13 | 2016-01-13 | A kind of Rogowski coil based on coaxial cable skeleton |
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| CN105448453A CN105448453A (en) | 2016-03-30 |
| CN105448453B true CN105448453B (en) | 2017-10-27 |
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| CN109643605B (en) * | 2016-11-08 | 2020-09-25 | 皇家飞利浦有限公司 | Inductor for high frequency and high power applications |
| CN107527715A (en) * | 2017-08-16 | 2017-12-29 | 贵州鑫湄纳米科技有限公司 | A kind of zero sequence current mutual inductor and preparation method thereof |
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| CN100394199C (en) * | 2004-05-18 | 2008-06-11 | 华中科技大学 | Direct current sensor |
| JP4622839B2 (en) * | 2005-12-12 | 2011-02-02 | 日新電機株式会社 | Rogowski coil, Rogowski coil production method, and current measuring device |
| JP5497232B2 (en) * | 2013-07-26 | 2014-05-21 | 日置電機株式会社 | Current sensor and method of manufacturing current sensor |
| CN104407272B (en) * | 2014-12-16 | 2017-09-08 | 国家电网公司 | A kind of cable identification device |
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Inventor after: Liu Yi Inventor after: Zhou Guyue Inventor after: Zhang Qin Inventor after: Xiao Dongxu Inventor after: Lin Fuchang Inventor after: Liu Gang Inventor before: Liu Yi Inventor before: Zhou Guyue Inventor before: Zhang Qin Inventor before: Xiao Dongxu Inventor before: Lin Fuchang |
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Effective date of registration: 20180125 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Co-patentee after: Power Grid Technique Research Center of China Southern Power Grid Co., Ltd. Patentee after: Huazhong University of Science and Technology Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: Huazhong University of Science and Technology |
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Effective date of registration: 20210901 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |