CN116500330B - Detection device for secondary loop current of superconducting transformer - Google Patents
Detection device for secondary loop current of superconducting transformer Download PDFInfo
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- CN116500330B CN116500330B CN202310763800.8A CN202310763800A CN116500330B CN 116500330 B CN116500330 B CN 116500330B CN 202310763800 A CN202310763800 A CN 202310763800A CN 116500330 B CN116500330 B CN 116500330B
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000006698 induction Effects 0.000 claims abstract description 30
- 238000009434 installation Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910001152 Bi alloy Inorganic materials 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
-
- 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
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a detection device for a secondary loop current of a superconducting transformer. The device has the function of measuring the secondary loop current of the superconducting transformer in real time, and comprises a shunt, a Hall sensor, a calibration coil, a Luo Ke coil, an induction coil, a compensation coil, a magnetic shielding device, a heater, a direct current power supply and a signal amplifier. The invention has the advantages of high precision, high response speed, low temperature drift, good linearity and strong anti-interference force, no magnetic saturation component is arranged in the detection device, the influence caused by magnetic flux saturation is reduced, the error caused by different installation positions of the Hall sensor in the traditional mode is reduced through the calibration coil, the interference caused by stray fields can be effectively avoided through the magnetic shielding device, and the information of the secondary loop current is accurately acquired.
Description
Technical Field
The invention relates to the technical field of superconduction, in particular to a measuring device for secondary circuit current of a superconducting transformer.
Background
With development of superconducting electrical technology and development and implementation of large-scale superconducting magnet projects, the test requirements on superconducting strands and superconducting conductors are greatly increased; the CICC conductor performance test platform is an experimental platform for simulating various performance tests of the superconducting conductor in the environment of high current, strong magnetic field and extremely low temperature. The working current of the power supply is usually in the level of hundred kiloamperes, the occupied area of the traditional direct current power supply module group is large, the energy consumption is high, and the power supply module group is inconvenient to move. Compared with the superconducting transformer, the superconducting transformer has the advantages of small volume, light weight, high efficiency, long service life, overload resistance and the like, and is a preferred mode of the conductor measuring device.
The CICC conductor is generally lapped in a secondary loop of the superconducting transformer for unfolding measurement, and in order to evaluate the real performance of the CICC conductor, the current applied to the CICC conductor needs to be obtained.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a measuring device for the secondary loop current of a superconducting transformer, which adopts a magnetic balance type Hall current sensor principle, is a direct current testing device with high measuring accuracy and strong anti-interference capability and can work in an extremely low temperature environment and is used for measuring the current in the secondary loop of the superconducting transformer.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a detection device for the secondary loop current of a superconducting transformer comprises a shunt, a Hall sensor, a calibration coil, a Luo Ke coil, a Luo Ke coil framework, an induction coil, a compensation coil framework, a magnetic shielding device, a heater, a direct current power supply and a signal amplifier.
The calibration coil is wound through a Luo Ke coil framework;
the Luo Kexian coil is wound on a Luo Ke coil framework, and the Luo Ke coil framework is sleeved in a secondary circuit of the superconducting transformer; the secondary loop of the superconducting transformer is a loop where a secondary coil of the superconducting transformer is located;
the induction coil is connected with the Luo Ke coil and is arranged in the magnetic shielding device;
the Hall sensor is arranged at the center of the induction coil;
the heater is arranged at the bottom of the magnetic shielding device;
the compensation coil is wound on the compensation coil framework, and the compensation coil framework is internally buckled on the Luo Ke coil framework;
the input of the signal amplifier is connected with the Hall sensor, and the output of the signal amplifier is connected with the control end of the direct current power supply;
the direct current power supply is connected with the compensation coil to form a loop; the shunt is connected in series in a loop formed by the direct current power supply and the compensation coil.
Furthermore, the calibration coil is made of NbTi superconducting wires, the coil is formed by winding a single NbTi superconducting wire for a plurality of circles, and the calibration coil passes through the inside of a Luo Ke coil framework and is used for calibrating the installation errors of Hall sensors and the like.
Further, the Luo Ke coil frame is ring-shaped, and can be divided into two semicircular rings, and 360 equidistant grooves are engraved on the Luo Ke coil frame for fixing the Luo Ke coil.
Furthermore, the Luo Ke coil is made of NbTi superconducting wires. The coil is formed by winding Luo Ke coil frameworks by single NbTi superconducting wires, and Luo Ke coils are arranged on the secondary coil of the superconducting transformer.
Further, the compensation coil framework is I-shaped, the upper part and the lower part are rectangular, the middle part is a cylinder, and a semi-annular Luo Ke coil framework groove is formed in the framework and used for placing the Luo Ke coil framework.
Furthermore, the compensation coil is made of NbTi superconducting wires, and the single NbTi superconducting wire of the compensation coil is formed by densely winding on the cylinder of the compensation coil framework along the radial direction.
Furthermore, the induction coil is made of NbTi superconducting wires, and is hollow cylindrical by a single NbTi superconducting wire.
Furthermore, the magnetic shielding device is a barrel with an opening at the upper part, and is made of oxygen-free copper.
Furthermore, the inner wall of the magnetic shielding device is poured with magnetic shielding materials, and the materials are lead bismuth alloy.
Further, the heater is placed at the bottom of the magnetic shielding device, the induction coil is placed at the upper part of the heater, and the Hall sensor is placed inside the induction coil.
Further, the induction coil is connected with the Luo Ke coil in a spot welding mode, and the joint resistance is smaller than 0.01 nano ohm.
Further, the shunt is connected in series in a loop of the direct current power supply and the compensation coil and is used for measuring the output size of the direct current power supply.
Furthermore, the superconducting transformer, the Hall sensor, the calibration coil, the Luo Ke coil, the Luo Ke coil framework, the induction coil, the compensation coil framework, the magnetic shielding device and the heater all work at the ambient temperature less than 5K.
Furthermore, the current divider, the direct current power supply and the signal amplifier all work in a room temperature environment.
The beneficial effects are that:
the invention provides a detection device for secondary loop current of a superconducting transformer, which can accurately collect information of secondary current and has the following advantages:
(1) The testing device has no magnetic saturation component, and can further avoid the testing influence caused by the saturation of the magnet.
(2) The calibration coil is added in the testing device and the testing method, so that errors caused by different installation positions of the traditional Hall sensor can be reduced, and the measuring accuracy is improved.
(3) The testing device can effectively avoid the interference of stray fields through the shielding device, and further improves the anti-interference performance of the testing device.
Drawings
FIG. 1 is a two-dimensional schematic plan view of a detection device for a secondary loop current of a superconducting transformer according to the present invention;
FIG. 2 is a three-dimensional view of a Luo Ke bobbin of the detection device for secondary loop current of a superconducting transformer of the present invention;
fig. 3 is an assembled three-dimensional view of a Luo Ke bobbin and a compensation bobbin of the detection device for a secondary loop current of a superconducting transformer according to the present invention.
In the figure: 1-magnetic shielding device, 2-Hall sensor, 3-compensation coil, 4-Luo Ke coil, 5-superconducting transformer secondary coil, 6-shunt, 7-DC power supply, 8-signal amplifier, 9-superconducting transformer primary coil, 10-induction coil, 11-heater, 12-calibration coil, 13-Luo Ke coil former, 14-compensation coil former.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a detection device for the secondary loop current of a superconducting transformer, and the application of the device to the accurate detection of the secondary loop current of the superconducting transformer is described below.
As shown in fig. 1, the detection device for the secondary loop current of the superconducting transformer of the present invention comprises a shunt 6, a hall sensor 2, a superconducting transformer, a calibration coil 12, a Luo Ke coil 4, an induction coil 10, a compensation coil 3, a magnetic shielding device 1, a heater 11, a direct current power supply 7 and a signal amplifier 8. Luo Ke coil 4 and induction coil 10 form a whole, luo Ke coil 4 is sleeved in the secondary loop of superconducting transformer, induction coil 10 is placed in magnetic shielding device 1, induction coil 10 and Luo Ke coil 4 are both NbTi superconducting wires with the same diameter, induction coil 10 and Luo Ke coil 4 are connected by adopting a spot welding method, energized secondary coil 5 of superconducting transformer generates forward magnetic flux, current is induced in Luo Ke coil 4, and current will generate an induction magnetic field proportional to current of secondary coil 5 of superconducting transformer in induction coil 10.
Further, the Hall sensor 2, the signal amplifier 8, the direct current power supply 7, the current divider 6 and the compensation coil 3 form a whole. The hall sensor 2 is placed in the induction coil 10, measures the magnitude of an induction magnetic field, generates hall voltage proportional to the magnitude of the magnetic field, amplifies the hall voltage by the signal amplifier 8, inputs the amplified hall voltage into the direct current power supply 7, generates current proportional to the hall voltage, inputs the current into the compensation coil 3, and the compensation coil 3 generates reverse magnetic flux.
Further, the forward magnetic flux and the reverse magnetic flux will cancel each other out, and when the magnetic flux flowing through the Luo Ke coil 4 is not zero, the hall sensor 2 will generate a bias voltage signal, so as to change the output current of the dc power supply 7 and adjust the unbalance of the forward magnetic flux and the reverse magnetic flux.
Further, when the forward magnetic flux and the reverse magnetic flux are balanced, the magnetic flux flowing through the Luo Ke coil 4 is zero, the output voltage of the hall sensor 2 is kept unchanged, the output current of the direct current power supply 7 is kept unchanged, the current output is proportional to the current of the secondary circuit of the superconducting transformer, and the current can be measured through the current divider 6.
As shown in fig. 1, the hall sensor 2, the heater 11 and the induction coil 10 are all placed in the magnetic shielding device 1, wherein the magnetic shielding material is made of lead bismuth alloy, and is poured on the inner wall of the magnetic shielding device 1, and the thickness is larger than 1cm.
Further, the heater 11 is located at the bottom of the magnetic shielding device 1, the induction coil 10 is placed above the heater 11, the heater 11 heats the induction coil 10 to quench before the device is measured, and the residual current of the induction coil 10 is eliminated.
As shown in fig. 1, the calibration coil 12 passes through the interior of the Luo Ke coil 4, and the function of the calibration coil is to pass through known current to the calibration coil 12 before each test starts, the voltage of the reading shunt 6 is converted into corresponding measured current, and the relevant error coefficient is solved by comparing the current of the compensation coil 3 with the measured current, so that the corresponding test error is evaluated, and the error impression caused by the installation position of the hall sensor 2 on the measurement is further reduced.
As shown in fig. 1, the magnetic shield device 1, the hall sensor 2, the compensation coil 3, the Luo Ke coil 4, the superconducting transformer secondary coil 5, the superconducting transformer primary coil 9, the induction coil 10, the calibration coil 12, the Luo Ke bobbin 13, and the compensation bobbin 14 are all operated in an environment having a temperature of 5K or less.
As shown in fig. 2, the Luo Ke coil skeleton 13 is ring-shaped, made of oxygen-free copper, and can be divided into two semicircular rings, the rings are assembled in a pin-aligning manner, 360 equally divided grooves are engraved on the ring skeleton, and Luo Ke coils 4 are uniformly wound in the grooves.
As shown in fig. 3, the Luo Ke coil frame 13 is internally provided with a compensation coil frame 14, the compensation coil frame 14 is in an i shape, the upper part and the lower part are rectangular, the middle part is a cylinder, the compensation coil 3 is closely wound on the frame along the radial direction, an L-shaped adapter is arranged at the lower side of the compensation coil frame 14 and used for fixing the inlet and outlet wires of the compensation coil 3, and the L-shaped adapter is made of oxygen-free copper.
The invention relates to a detection device for the secondary loop current of a superconducting transformer, which comprises the following steps:
step 1, the superconducting transformer does not work, the calibration coil 12 is electrified, meanwhile, the voltage value of the acquisition shunt 6 is converted into corresponding current, a plurality of groups of different currents are repeated, the deviation between the measured current and the input current is calculated, and the calibration coefficient is obtained;
and 2, closing the input of the calibration coil 12, setting the current of the primary coil of the superconducting transformer, obtaining voltage through the current divider 6, converting the voltage into current, and multiplying the current by a calibration coefficient, namely the current of the secondary loop of the superconducting transformer at the time.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the invention or from the scope of the invention as defined in the accompanying claims.
Claims (13)
1. A detection device for superconducting transformer secondary circuit current, its characterized in that: the magnetic sensor comprises a shunt, a Hall sensor, a calibration coil, a Luo Ke coil, a Luo Ke coil framework, an induction coil, a compensation coil framework, a magnetic shielding device, a heater, a direct current power supply and a signal amplifier; the calibration coil is wound through a Luo Ke coil framework; the Luo Kexian coil is wound on a Luo Ke coil framework, the Luo Ke coil framework is sleeved in a secondary loop of the superconducting transformer, and the secondary loop of the superconducting transformer is a loop where the secondary coil of the superconducting transformer is located; the induction coil is connected with the Luo Ke coil and is arranged in the magnetic shielding device; the Hall sensor is arranged at the center of the induction coil; the heater is arranged at the bottom of the magnetic shielding device; the compensation coil is wound on a compensation coil framework, and a semi-annular Luo Ke coil framework groove is formed in the compensation coil framework and used for placing the Luo Ke coil framework; the input of the signal amplifier is connected with the Hall sensor, and the output of the signal amplifier is connected with the control end of the direct current power supply; the direct current power supply is connected with the compensation coil to form a loop; the shunt is connected in series in a loop formed by the direct current power supply and the compensation coil.
2. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the calibration coil is made of NbTi superconducting wires, passes through the Luo Ke coil framework and is used for calibrating the installation error of the Hall sensor.
3. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the Luo Ke coil framework is annular and divided into two semicircular rings, and 360 equidistant grooves are engraved on the Luo Ke coil framework and used for fixing the Luo Ke coil.
4. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the Luo Ke coil is made of NbTi superconducting wires, and the Luo Ke coil is arranged on the secondary coil of the superconducting transformer.
5. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the compensating coil framework is I-shaped, is rectangular, is cylindrical in the middle, and is internally provided with a semi-annular groove of the Luo Ke coil framework for placing the Luo Ke coil framework.
6. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 5, wherein: the compensation coil is made of NbTi superconducting wires, and is densely wound on the cylinder of the compensation coil framework along the radial direction.
7. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the induction coil is made of NbTi superconducting wires.
8. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the magnetic shielding device is a barrel type with an opening at the upper part, and is made of oxygen-free copper.
9. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 8, wherein: the inner wall of the magnetic shielding device is poured with a magnetic shielding material, and the magnetic shielding material is lead bismuth alloy.
10. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 8, wherein: the heater is placed at the bottom of the magnetic shielding device, the induction coil is placed at the upper part of the heater, and the Hall sensor is placed in the induction coil.
11. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the current divider is used for measuring the output size of the direct current power supply.
12. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the superconducting transformer, the Hall sensor, the calibration coil, the Luo Ke coil, the Luo Ke coil framework, the induction coil, the compensation coil framework, the magnetic shielding device and the heater all work at the ambient temperature of less than 5K.
13. A detection apparatus for a secondary loop current of a superconducting transformer according to claim 1, wherein: the current divider, the direct current power supply and the signal amplifier all work in a room temperature environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310763800.8A CN116500330B (en) | 2023-06-27 | 2023-06-27 | Detection device for secondary loop current of superconducting transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310763800.8A CN116500330B (en) | 2023-06-27 | 2023-06-27 | Detection device for secondary loop current of superconducting transformer |
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| Publication Number | Publication Date |
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| CN116500330A CN116500330A (en) | 2023-07-28 |
| CN116500330B true CN116500330B (en) | 2023-09-08 |
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