CN111257611A - Device for measuring transport current in superconducting wire by magnetic induction coil method - Google Patents
Device for measuring transport current in superconducting wire by magnetic induction coil method Download PDFInfo
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- CN111257611A CN111257611A CN201811467657.3A CN201811467657A CN111257611A CN 111257611 A CN111257611 A CN 111257611A CN 201811467657 A CN201811467657 A CN 201811467657A CN 111257611 A CN111257611 A CN 111257611A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The invention discloses a device for measuring transport current in a superconducting wire by a magnetic induction coil method, and belongs to the technical field of superconducting application. The technical scheme provided by the invention has the key points that: the measurement principle is as follows: when the superconducting wire transports direct current, a stable static magnetic field is formed on the outer surface of the superconducting wire, an opening coil is arranged outside the wire, if the coil rotates perpendicular to the wire and a plane where the central point of the coil is located, induced electromotive force is generated in the coil, and the transported current is indirectly measured by measuring the induced electromotive force; the whole device improves a rigid Rogowski coil to measure the transport current in the superconducting wire, and a probe part of the device is that the rigid Rogowski coil is driven by a stepping motor fixed on a self-made bracket through the bottom, so that the change of magnetic flux in a coil to time is detected through the probe, namely the Rogowski coil measures the changing magnetic field of alternating current, and the Rogowski coil test condition is met.
Description
Technical Field
The invention belongs to the technical field of superconducting application, and particularly relates to a device for measuring transport current in a superconducting wire by a magnetic induction coil method.
Background
The high-temperature superconducting cable has the characteristics of extra-high current density, ultralow power transmission loss and the like, has the environmental protection advantages of energy conservation, zero electromagnetic interference, non-explosiveness, incombustibility, no toxicity and the like, is a high-capacity compact power transmission cable with great application prospect, and the superconducting technology is an effective way for solving the difficulties in the current power system. With the continuous progress of high-temperature superconducting materials and related technologies, high-temperature superconducting cables gradually move from laboratories to actual grid-connected operation, but at present, high-temperature superconducting cable projects actually incorporated into a power grid are researched and designed for alternating-current power transmission occasions. In fact, the zero resistance characteristic of high temperature superconducting materials is only satisfied under dc application conditions, whereas in ac applications, ac losses are unavoidable. And compared with alternating current transmission, direct current transmission has more flexible control characteristics. In recent years, research on superconducting power devices has been greatly advanced. However, the application of superconducting power devices brings new problems, and especially at high current of the system, the quenching of the superconducting devices is a serious problem, and the safety of the devices and the system is directly damaged. This all requires accurate on-line measurement and control of the current transported in the superconducting wire.
However, the transported current in the superconducting wire is generally large, and the Hall piece is saturated and fails; one basic characteristic of superconduction is zero resistance, and the thermal effect of current approaches zero when direct current superconduction is carried out; nor does there occur an exchange of electromagnetic energy, which is static, which brings about a trouble in the measurement. At present, the following methods are mainly used for measuring the direct current heavy current: the current divider method, the magnetic modulation method, the nuclear magnetic resonance method, the magneto-optical effect method, the hall effect method, the rogowski coil method, the direct current comparator method and the like, which are the measurement of the conventional conductive wire, can not be directly applied to the online measurement of the superconducting wire. However, the performance detection technology of the superconducting power device is closely related to the reliability enhancement of the superconducting power technology. In order to make the superconducting power device enter the power system, key technologies such as a detection method and a detection standard of the superconducting power device must be researched so as to realize comprehensive and scientific performance detection of the developed superconducting power device and ensure that the operating superconducting power device has good technology and reliable operation performance. However, currently, there is no effective means for measuring the direct current carried in the superconducting wire.
The Rogowski coil is an alternating current sensor, is a hollow annular coil, has flexibility and rigidity, and can be directly sleeved on a measured conductor to measure alternating current. The Rogowski coil is suitable for measuring alternating current in a wider frequency range, has no special requirements on conductors and sizes, and has the advantages of higher instant response capability and the like. The method is widely applied to high-frequency and large-current measurement. The problem to be solved urgently is to research whether the Rogowski coil principle can be used for improving the measurement of the transport current in the direct current superconducting wire, and a device for measuring the direct current transport current in the superconducting wire in the preparation engineering is needed.
Disclosure of Invention
The invention provides a device for measuring transport current in a superconducting wire by a magnetic induction coil method, aiming at solving the problem of measuring transport direct current in the superconducting wire applied in engineering.
The invention adopts the following technical scheme for solving the technical problems, and the device for measuring the transport current in the superconducting wire by using the magnetic induction coil method is characterized in that:
when the superconducting wire transports direct current, a stable static magnetic field is formed outside the superconducting wire, an opening coil is arranged outside the superconducting wire, and if the coil rotates perpendicular to the plane where the superconducting wire and the center point of the coil are located, induced electromotive force is generated in the coil.
Any current carrying according to the Biao-Saval lawIThe magnetic induction intensity of the wire at the point P with the off-line distance r is as follows:
if the coil area is S, the number of turns of the coil is N, and the rotation angle rate of the coil is W, the induced electromotive force of the coil is as follows:
in the formulaL 1，L 2Are respectively asThe distance between the center of the wire and the upper edge and the lower edge of the coil, theta is the phase, and the measured transport current is indirectly obtained by calculating through measuring the induced electromotive force.
The Rogowski coil is mainly used for measuring the current in the wire by measuring the alternating current magnetic field of the alternating current, so that the Rogowski coil cannot be directly used for measuring the transport direct current in the superconducting wire. According to the relative motion relation, when a stable magnetic field outside a direct current is measured, a coil arranged outside a near superconducting wire is driven to move by a stepping motor through a rigid Rogowski coil, so that the change of magnetic flux in the coil to time is detected through a probe, and the Rogowski coil is equivalent to the Rogowski coil in measuring the changing magnetic field of the alternating current, so that the Rogowski coil testing condition is met.
The whole device is characterized in that a rigid Rogowski coil of a probe part is driven by a stepping motor fixed on a self-made bracket through the bottom, an integral operation amplification circuit module and a digital display module can adopt Rogowski coil detection equipment, and the equipment is clamped on a superconducting conveying line for measurement and reading during use by modifying parameters of the device.
Further preferably, the probe is rigid Rogowski coil type number LS-N-1000;
further preferably, the stepping motor is a Baigela stepping motor model VRDM 31122/LWB;
further preferably, the set stepping motor speed is 50 rpm.
Compared with the prior art, the invention has the following beneficial effects: the device for measuring the transport current in the superconducting wire by adopting the improved rigid Rogowski coil method changes the characteristic that the Rogowski coil cannot measure the direct current; the problem of measuring large transport current in the superconducting wire on line is solved; compared with the common direct current measuring Hall sensor, the method has smaller influence on the measuring environment temperature, and the semiconductor saturation failure of the Hall sensor under the condition of large current (MA magnitude of theoretical transport current of a superconducting wire) can not occur; the device can measure large transport current in the superconducting wire and can also measure large direct current of a common wire.
Drawings
FIG. 1 is a schematic diagram of a measurement principle of an apparatus according to an embodiment of the present invention. In the figure, 1) the direction of the wire and the direct current, 2) the magnetic field of the current, and 3) the coil;
FIG. 2 is a schematic diagram of an embodiment of the present invention. In the figure, 1) three claws of a bracket, 2) a superconducting wire, 3) a vertical rod of the bracket, 4) a base, 5) a coil of a probe, and 6) driving of the coil of the probe and digital display of results are realized;
FIG. 3 is a schematic diagram of a probe coil and a driving device according to an embodiment of the invention. In the figure, 1) a probe coil and 2) a stepping motor are arranged;
FIG. 4 is a table comparing measured current to actual current for an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples, and that all the technologies realized based on the above subject matter of the present invention belong to the scope of the present invention.
Examples
As shown in figure 1, the measuring principle of the device of the invention is that a rotating coil is arranged outside an electrified lead, and because the current in the wire forms a magnetic field outside, the coil rotates along a plane where the lead and the center point of the coil are positioned, and induced electromotive force is generated in the coil. The induced electromotive force generated in the coil and the current I in the electrified lead are related to the coil area, the rotating speed and the distance between the magnetic needle and the electrified lead. When the coil and the rotating speed are determined and the distance between the coil and the rotating speed is constant, as shown in the equipment schematic diagram of the embodiment of the invention in fig. 2, under the condition that the rotating speed of the coil of the probe is constant, the bracket for fixing the probe clamps the electrified superconducting wire, and even if the thickness of the electrified superconducting wire is changed slightly, the distance between the center line of the superconducting wire and the probe can be always kept constant. The probe coil is driven to rotate by a bottom stepping motor, as shown in fig. 3, even if a direct current stabilizes a magnetic field, the coil is rotated, so that the magnetic flux passing through the coil surface is changed, the condition of measuring the current by the Rogowski coil method can be met, and the result is output by a digital display device through an integral operation amplifying circuit module.
FIG. 4 is a comparison table of the current measured and the actual current measured in the general DC lead and the electrolytic aluminum circuit, and the comparison and analysis of the data in the table shows that the measured value is very close to the actual current, which also shows that the device can accurately measure the current value with a wide range of measurement.
The foregoing embodiments illustrate the principles, principal features and advantages of the invention, and it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made therein without departing from the scope of the principles of the invention.
Claims (1)
1. The device for measuring transport current in the superconducting wire by using the magnetic induction coil method is characterized in that:
(1) the measurement principle is as follows: when the superconducting wire transports direct current, a stable static magnetic field is formed on the outer surface of the superconducting wire, an opening coil is arranged outside the wire, if the coil rotates perpendicular to the wire and a plane where the central point of the coil is located, induced electromotive force is generated in the coil, and the transported current is indirectly measured by measuring the induced electromotive force;
(2) the whole device improves a rigid Rogowski coil to measure the transport current in the superconducting wire, the probe part of the device is that the rigid Rogowski coil is driven by a stepping motor fixed on a self-made bracket through the bottom, the change of magnetic flux in a coil to time is detected through the probe, the change of the magnetic flux in the coil to time is equivalent to the change of the Rogowski coil in measuring alternating current, the Rogowski coil testing condition is met, and the result is output by a digital display device.
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| CN201811467657.3A CN111257611A (en) | 2018-12-03 | 2018-12-03 | Device for measuring transport current in superconducting wire by magnetic induction coil method |
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| CN201811467657.3A CN111257611A (en) | 2018-12-03 | 2018-12-03 | Device for measuring transport current in superconducting wire by magnetic induction coil method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109974A (en) * | 1993-10-12 | 1995-10-11 | 住友特珠金属株式会社 | DC current sensor |
| JP2009247155A (en) * | 2008-03-31 | 2009-10-22 | Railway Technical Res Inst | Method and device for detecting high-resistance ground fault |
| CN101975933A (en) * | 2010-09-08 | 2011-02-16 | 佛山科学技术学院 | Steady weak magnetic-field measurement apparatus based on Wigan effect |
| CN102445588A (en) * | 2011-11-23 | 2012-05-09 | 中国人民解放军海军工程大学 | Short-time slowly-varying high-current measuring device based on (printed circuit board) PCB type Rogowski coil |
| CN104067103A (en) * | 2011-11-23 | 2014-09-24 | Skf公司 | Method and system for detection of electric currents through a bearing of a rotating system |
| CN107064604A (en) * | 2017-05-10 | 2017-08-18 | 哈尔滨工业大学 | A kind of current sensor device based on magnetic field sensing |
| CN110794193A (en) * | 2019-11-14 | 2020-02-14 | 国网四川省电力公司电力科学研究院 | Flexible non-contact magnetic sensor array current measuring device and measuring method |
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2018
- 2018-12-03 CN CN201811467657.3A patent/CN111257611A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109974A (en) * | 1993-10-12 | 1995-10-11 | 住友特珠金属株式会社 | DC current sensor |
| JP2009247155A (en) * | 2008-03-31 | 2009-10-22 | Railway Technical Res Inst | Method and device for detecting high-resistance ground fault |
| CN101975933A (en) * | 2010-09-08 | 2011-02-16 | 佛山科学技术学院 | Steady weak magnetic-field measurement apparatus based on Wigan effect |
| CN102445588A (en) * | 2011-11-23 | 2012-05-09 | 中国人民解放军海军工程大学 | Short-time slowly-varying high-current measuring device based on (printed circuit board) PCB type Rogowski coil |
| CN104067103A (en) * | 2011-11-23 | 2014-09-24 | Skf公司 | Method and system for detection of electric currents through a bearing of a rotating system |
| CN107064604A (en) * | 2017-05-10 | 2017-08-18 | 哈尔滨工业大学 | A kind of current sensor device based on magnetic field sensing |
| CN110794193A (en) * | 2019-11-14 | 2020-02-14 | 国网四川省电力公司电力科学研究院 | Flexible non-contact magnetic sensor array current measuring device and measuring method |
Non-Patent Citations (5)
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| 姜敏夫: "《电工知识》", 31 August 1988 * |
| 朱韬析，等: "南方电网直流输电工程的光测量系统典型异常及处理方法", 《电力系统保护与控制》 * |
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