CN208690919U - Protection circuit is quenched for MW class high-temperature superconductor direct current induction heater - Google Patents
Protection circuit is quenched for MW class high-temperature superconductor direct current induction heater Download PDFInfo
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- CN208690919U CN208690919U CN201821543374.8U CN201821543374U CN208690919U CN 208690919 U CN208690919 U CN 208690919U CN 201821543374 U CN201821543374 U CN 201821543374U CN 208690919 U CN208690919 U CN 208690919U
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- 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
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- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
It is a kind of to quench protection circuit for MW class high-temperature superconductor direct current induction heater, including DC power supply (1), counnter attack protective circuit of diode (5), release can circuit protection circuit, degausser and overvoltage crowbar.The DC power supply is released by the connection of counnter attack protective circuit of diode can protect circuit；It releases energy circuit protection circuit and overvoltage crowbar is connected by degausser；Release can circuit by release can resistance be superconducting magnet release can, and in superconducting magnet (4) plus successively change polarity, the DC current method that numerical value is gradually reduced gives superconducting magnet degaussing；Protection is quenched to superconducting magnet to realize.The protection circuit that quenches of the utility model is applied to high-temperature superconductor direct current induction heater for the first time；The utility model quench protection circuit belong to it is active quench protection, and it is simple, reliably；The superconducting magnet that the utility model is applicable to the big self-induction of superconducting magnet about 100H quenches protection.
Description
Technical field
Protection circuit is quenched for MW class high-temperature superconductor direct current induction heater the utility model relates to a kind of, belongs to high
Temperature superconductive applied technical field.
Background technique
Traditional electromagnetic induction heating technology, because its structure is simple, the advantages such as environmental protection obtain in steel processing industry field
It is widely applied.But when heating the materials such as nonferromagnetic material such as aluminium or copper, heater utilization rate of electrical will drop significantly
It is low.Direct supercurrent induction heating is the combination of superconducting power application technology and induction heating technique, takes full advantage of superconduction
Low loss characteristic in DC environment is realized in aluminium processing industry before aluminium extrusion link in combination with electromagnetic induction technology
Warm operation.Relative to traditional alternating current impression heating technique, then have in terms of the effect that utilization rate of electrical and workpiece heat huge
Big advantage.
Relative to alternating current impression heating technique, the advantage of DC superconducting induction heating technique be may be summarized as follows:
(1) energy-efficient.When heating the non-magnetic material of the low-resistivities such as aluminium ingot or copper ingot, the advantage is particularly evident.
At this point, efficiency can be improved by the 40%-50% of traditional induction heating to 80% or more.
(2) homogeneous heating.During induction heating, if wanting to promote the penetration power heated, it is desirable that low-frequency electricity
Stream and high-intensitive magnetic field.Compared to the power current that alternating current impression uses, the changes of magnetic field frequency of direct current induction heating can be by
It is heated the rotation speed control of blank.Thus the faster heating speed of bring, better homogeneous heating degree
(3) various nonferrous materials can be heated.Direct current induction heating can be not only used for the heating of aluminium, copper, also be applicable in
In the heating of magnesium alloy, titanium alloy, nichrome and other specific alloys.
(4) controllable temperature gradient.In actual industrial extrusion application, it is sometimes desirable to Isothermal Extrusion.This requires quilts
The temperature on the aluminium bar surface of preheating is needed in certain temperature gradient distribution.
Magnet protection is related to two aspects, mechanical protection and electic protection.Protection in view of mechanical aspects is based primarily upon machine
The improvement of tool technique.
In terms of electric fault it is main in face of the problem of be exactly that superconductor quenches problem.
In recent years, the research and development of second-generation high-temperature superconductor are increasingly becoming the Research Emphasis of superconduction circle.It is to apply with YBCO
The superconductor of layer, the superconducting tape constituted in addition with base, separation layer, protective layer, relative to bismuth system BSCCO superconduction oxidation
The first generation high-temperature superconductor band of object, magnetic field ability to bear especially current-carrying capability greatly promote.But this has also drawn one
A problem: second generation superconducting tape quenches that problem is more serious, especially with the loop construction of second generation superconducting tape coiling
It is compact, the number of turns is more, once quenches when for making magnet, band resistance increases rapidly magnet internal temperature rapid increase, very
It is easy to burn magnet, therefore, which more should significant.
The protection that quenches of superconducting magnet is exactly to be quickly detected the state of quenching using certain means or tool, to magnet
In the case where itself not causing permanent damages, the energy inside magnet is discharged.When superconducting magnet is lost in the process of running
Time-out, partial region, which will appear, to be quenched a little, and then temperature rises, and equivalent resistance increases.Then lead to bigger temperature rise, make to quench
Range further expansion finally quenches entire magnet coil, reverts to normal resistance state if not applying measure prevention.Superconducting magnetic
Body quenches process and can lead to two results: one is cooling medium such as liquid nitrogen since a large amount of evaporations occurs in temperature rise, is made closed
Space pressure quickly increases；On the other hand, quenching causes room temperature resistance area to occur, so that the resistive voltage of coil increases.
Usually there is larger self-induction, about 100H in superconducting magnet, when charging needs larger voltage, and end voltage when electric current is stablized
Again close to zero.The DC power supply shall apply to the particularity of superconducting magnet, and have many advantages, such as efficiently, low ripple.
Summary of the invention
The purpose of this utility model is, in order to solve the problems, such as quenching for superconducting magnet, proposes a kind of for MW class high temperature
Direct supercurrent induction heater quenches protection circuit.
The technical scheme for implementing the utility model is as follows, including a kind of for MW class high-temperature superconductor direct current induction heater
Quench protection circuit.
The utility model is a kind of to quench protection circuit for MW class high-temperature superconductor direct current induction heater, comprising:
DC power supply provides continuous current to superconducting magnet；
Counnter attack protective circuit of diode avoids releasing energy resistance as the load of superconducting magnet and consumes energy；
Energy circuit protection circuit is released, for releasing energy to superconducting magnet；
Degausser, for removing remanent magnetism to superconducting magnet；
Overvoltage crowbar；For the side pressure of superconducting magnet to be maintained to certain level in exoergic process, raising is released
It can efficiency；
The DC power supply is released by the connection of counnter attack protective circuit of diode can protect circuit；It is logical to release energy circuit protection circuit
Cross degausser connection overvoltage crowbar；It releases energy circuit and releases energy by releasing energy resistance for superconducting magnet, and in superconducting magnet
The DC current method that successively change polarity, numerical value are gradually reduced is added to give superconducting magnet degaussing；To realize the mistake to superconducting magnet
Super protection.
It is described release can circuit protection circuit by three with Diode series release energy resistor coupled in parallel it is in parallel with varistor again
It forms；
Three release can resistance be respectively first release can resistance, second release can resistance and third release can resistance；First releases energy electricity
The second diode of resistance series connection, second release can resistance series connection third diode, third release can resistance connect the 4th diode；Three with
Releasing for Diode series can be in parallel with the first varistor after resistor coupled in parallel.
The degausser, which is connected to, to be released and can protect between circuit and overvoltage crowbar；Circuit series contactor it is normally opened
Contact；By degausser, add the DC current method that successively change polarity, numerical value are gradually reduced to superconducting magnetic in superconducting magnet
Body demagnetization.
The side pressure of superconducting magnet is maintained certain level by the overvoltage crowbar in exoergic process.
The DC power supply is to the rate and constant current voltage subsection setup of magnet charge and discharge process, i.e., from zero current to wait set
Between fixed target current value, 10 electric current sections, current changing rate and perseverance of each section when being charged and discharged can be divided into
Galvanic electricity pressure can be independently arranged.
The voltage that the DC power supply provides is 100 volts, and electric current is 200 peaces.
The counnter attack protective circuit of diode is made of counnter attack diode (led) module, including counnter attack diode；The counnter attack two
When pole pipe module is installed in control cabinet, have to install radiator additional before use；The counnter attack diode is fast two pole of quick-recovery
Pipe；It is noted that forward current rating, backward voltage and forward voltage drop when counnter attack diode selecting；When counnter attack diode type selecting,
Because its forward current is larger, in order to reduce power consumption, general forward voltage drop is the smaller the better；And backward voltage it is also more big more
It is good.
The energy resistance of releasing is using ZnO varistor.
The working principle of the utility model is as follows, and the purpose for quenching protection refers to when superconducting coil quenches, and makes as far as possible
Its hot(test)-spot temperature and end voltage are in minimum.The resistance value for releasing energy resistance is bigger, releases the faster of the current attenuation in energy circuit, releases energy
Efficiency it is bigger, the energy that superconducting magnet is transferred to outside is more, and the temperature rise of deactivation coil superzone can electricity but release with regard to smaller
It is bigger to hinder resistance value, magnet end voltage is bigger when releasing energy, therefore the size for releasing energy resistance is limited by the electric insulation quality of magnet.
When superconducting magnet quenches, signal detection and processing module need the timely generation for detecting such case, logic
Signal value detected is closed value with the protection of setting and compared by analysis module, however, it is determined that the signal is to quench signal, then exports
Signal is controlled to control execution module, rapidly comes out the intracorporal energy transfer of magnetic；Being in parallel with superconducting magnet is to release energy resistance,
Change the size and number for releasing energy resistance, the exergonic length of time of superconducting magnet and coil voltage can be changed.
Degausser mainly aims to demagnetization.Superconducting magnet can the equivalent big inductance at about 100H, after quenching protection,
Energy release in magnet, but still can have remanent magnetism.By degausser, superconducting magnet demagnetization is given.It is subsequent convenient for equipment
Normal work and maintenance etc..
The utility model has the beneficial effects that the protection circuit that quenches of the utility model is applied to high-temperature superconductor direct current for the first time
Induction heater；The utility model quench protection circuit belong to it is active quench protection, and it is simple, reliably；This is practical new
The superconducting magnet that type is applicable to the big self-induction of superconducting magnet about 100H quenches protection.
Detailed description of the invention
Fig. 1 is that the utility model quenches protection circuit schematic diagram；Fig. 2 is counnter attack protective circuit of diode；
Fig. 3 is to release energy circuit protection circuit；Fig. 4 is degausser；Fig. 5 is overvoltage crowbar；
In figure, 1 is DC power supply (100V, 200A)；2 be to quench protective switch and control；3 be to release energy resistance；4 be superconduction
Magnet (100H)；5 be counnter attack diode；6 be Dewar bottle；R1 releases for first can resistance；R2 releases for second can resistance；R3 is third
Releasing can resistance；R4 is the first varistor；R5 is the second varistor；D1 is first diode；D2 is the second diode；D3 is
Third diode；D4 is the 4th diode；KM1 is first contactor；KM2 is second contactor；PA1 is ammeter；PV1 is electricity
Press table.
Specific embodiment
Specific embodiment of the present utility model is as shown in the figure.
Fig. 1 show the scheme schematic diagram that the utility model quenches protection circuit.DC power supply (100V, 200A) provides permanent
Galvanic electricity stream gives superconducting magnet (inductance about 100H).
The rate and constant current voltage sectional of magnet charge and discharge process is arranged in DC power supply, i.e., from zero current to wait set
Target current value between, 10 electric current sections can be divided into, current changing rate and constant current of each section when being charged and discharged
Voltage can be independently arranged.The program has a counnter attack connection function, the diode in scheme, makees counnter attack, when selection it is noted that it is specified just
To electric current, backward voltage and forward voltage drop.When this diode type selecting, because its forward current is larger, in order to reduce power
Consumption, general forward voltage drop are the smaller the better.And backward voltage is also the bigger the better.This connection is simple and reliable, but when the big electricity of input
Power consumption influence is very big in the case where stream.
When superconducting magnet quenches, signal detection and processing module need the timely generation for detecting such case, logic
Signal value detected is closed value with the protection of setting and compared by analysis module, however, it is determined that the signal is to quench signal, then exports
Signal is controlled to control execution module, rapidly comes out the intracorporal energy transfer of magnetic.Being in parallel with superconducting magnet is to release energy resistance,
Change the size and number for releasing energy resistance, the exergonic length of time of superconducting magnet and coil voltage can be changed.
Fig. 2 show counnter attack protective circuit of diode, in normal operating conditions, becomes superconducting magnet to avoid releasing energy resistance
Load and consume energy, devise fast recovery diode.
When counnter attack diode (led) module is installed in control cabinet, have to install radiator additional before use.It is wanted when diode selecting
Pay attention to forward current rating, backward voltage and forward voltage drop.When this diode type selecting, because its forward current is larger, it is
Reduction power consumption, general forward voltage drop are the smaller the better.And backward voltage is also the bigger the better.This connection is simple and reliable, but
Power consumption influence is very big in the case where inputting high current.Counnter attack diode is the diode electronic component of standard；Electricity
When road is designed, only according to the design needs, the diode of different designs parameter is selected to realize anti-reflection function.
Fig. 3 is to release energy circuit protection circuit.Before superconducting magnet quenches, superconducting magnet coil has megajoule order of magnitude
Big storage energy；After quenching, this will be dissipated in the resistance volume of conductor.It is typically all super that energy circuit is released in outside
Energy resistance is released for magnetizer loong shunt one to carry out releasing energy.
The purpose for quenching protection refers to that when superconducting coil quenches, its hot(test)-spot temperature made as far as possible and end voltage are in most
It is small.Find out that the resistance value for releasing energy resistance is bigger, releases the faster of the current attenuation in energy circuit, the efficiency for releasing energy is bigger, superconducting magnetic
The energy that body is transferred to outside is more, the temperature rise of deactivation coil superzone with regard to smaller but release can resistance it is bigger, release can when magnetic
Body end voltage is bigger, therefore the size for releasing energy resistance is limited by the electric insulation quality of magnet.
It quenches protection and realizes that quenching protective switch is a brief ON-OFF control circuit by quenching protective switch, lead to
It crosses contactor and realizes switch control.
Fig. 4 is degausser.Degausser is used in superconducting magnet plus successively change polarity, numerical value be gradually reduced it is straight
It flows current method and carries out degaussing.General commutating frequency is l ~ l0HZ.Dc erasing reduces skin effect, and demagnetization depth increases.
Fig. 5 is overvoltage crowbar.In overvoltage crowbar, uses ZnO varistor as energy resistance is released, not only make to release
Energy circuit becomes very simple, and the side pressure of superconducting magnet is maintained to certain level in exoergic process, and energy is released in raising
Efficiency.The ability that single ZnO varistor absorbs energy is limited, needs in actual quench in protection circuit using 2 threshold values
The identical ZnO varistor of voltage is in parallel.In reality, the ZnO varistor of same size can not accomplish that threshold voltage is complete
Equal, they are constantly present a reasonable deviation, if multiple ZnO varistors are directly together in parallel, threshold value
ZnO varistor less than normal will be first breakdown, and electric current will distribute unevenly between each ZnO varistor, some ZnO pressures
Quick resistance is possible to bear excessively high electric current to be burned out, it is possible to a upper resistance value of connecting on each ZnO varistor
Identical flows resistance.
R4 and R5 in Fig. 5 are ZnO varistors, in use, would generally multiple voltage dependant parallels uses.R4 and R5 go here and there
Join flows resistance；Each varistor is connected flows resistance in actual use.
Claims (6)
1. a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater, which is characterized in that described to quench
Protection circuit includes DC power supply, counnter attack protective circuit of diode, releases energy circuit protection circuit, degausser and overvoltage protection electricity
Road；
The DC power supply is released by the connection of counnter attack protective circuit of diode can protect circuit；Energy circuit protection circuit is released by going
Magnetic circuit connects overvoltage crowbar；Release can circuit by release can resistance be superconducting magnet release can, and in superconducting magnet plus according to
The DC current method that secondary change polarity, numerical value are gradually reduced gives superconducting magnet degaussing；Guarantor is quenched to superconducting magnet to realize
Shield.
2. it is according to claim 1 it is a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater,
It is characterized in that, it is described release can circuit protection circuit by three with Diode series release energy resistor coupled in parallel again with varistor simultaneously
Join；
Three release can resistance be respectively first release can resistance, second release can resistance and third release can resistance；First releases energy resistance string
Join the second diode, second release can resistance series connection third diode, third release can resistance connect the 4th diode；Three and two poles
Managing concatenated release can be in parallel with the first varistor after resistor coupled in parallel.
3. it is according to claim 1 it is a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater,
It releases and can protect between circuit and overvoltage crowbar it is characterized in that, the degausser is connected to；Circuit series contactor
Normally opened contact.
4. it is according to claim 1 it is a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater,
It is characterized in that, the voltage that the DC power supply provides is 100 volts, electric current is 200 peaces.
5. it is according to claim 1 it is a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater,
It is characterized in that, the counnter attack protective circuit of diode is made of counnter attack diode (led) module, including counnter attack diode；The counnter attack
When diode (led) module is installed in control cabinet, the counnter attack diode is fast recovery diode.
6. it is according to claim 1 it is a kind of quench protection circuit for MW class high-temperature superconductor direct current induction heater,
It is characterized in that, the energy resistance of releasing is ZnO varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821543374.8U CN208690919U (en) | 2018-09-20 | 2018-09-20 | Protection circuit is quenched for MW class high-temperature superconductor direct current induction heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821543374.8U CN208690919U (en) | 2018-09-20 | 2018-09-20 | Protection circuit is quenched for MW class high-temperature superconductor direct current induction heater |
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| Publication Number | Publication Date |
|---|---|
| CN208690919U true CN208690919U (en) | 2019-04-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178844A (en) * | 2021-04-19 | 2021-07-27 | 安徽硕金医疗设备有限公司 | Protection circuit of superconducting magnet system |
-
2018
- 2018-09-20 CN CN201821543374.8U patent/CN208690919U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178844A (en) * | 2021-04-19 | 2021-07-27 | 安徽硕金医疗设备有限公司 | Protection circuit of superconducting magnet system |
| CN113178844B (en) * | 2021-04-19 | 2023-11-17 | 安徽硕金医疗设备有限公司 | Protection circuit of superconducting magnet system |
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