CN1211802A - Superconducting current limiting device having damping coils - Google Patents
Superconducting current limiting device having damping coils Download PDFInfo
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- CN1211802A CN1211802A CN 97118655 CN97118655A CN1211802A CN 1211802 A CN1211802 A CN 1211802A CN 97118655 CN97118655 CN 97118655 CN 97118655 A CN97118655 A CN 97118655A CN 1211802 A CN1211802 A CN 1211802A
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Abstract
A superconductor current limiter having gap in magnetic core can be used for different electric power systems. Even in transient condition, the superconductor current-limiting performance can be improved by the two parellel magnetic circuits coupled with primary winding, gap and damping winding.
Description
The present invention relates to a kind of superconducting current limiter of in magnetic core, introducing the space, specifically, relate to the current limiting performance that utilizes damping coil to improve superconducting current limiter.
Usually, magnetic cell, inductor and transformer are the indispensable parts of most of electronic installation.The magnetic of these materials and electrical property have significant effects to inductor and design of electronic devices and manufacturing.To consider their expense, volume, weight and manufacture difficulty etc. when designing the various magnetic cell that utilizes magnetic property, thereby, be necessary to propose a kind of effective design according to the relevant principle of decision magnetic cell performance.
For high-quality electric power being provided and preventing from electrical network, to fluctuate via electronic component, developed and proposed a kind of superconducting current limiter, it is a kind of of magnetic cell.Desirable superconducting current limiter is under normal circumstances insignificant to the influence of circuit, and can prevent under failure condition owing to impedance moment increase causes transient current to become very big.Yet several high-temperature superconductor current-limiting apparatus model machines of magnetic material that utilize reduce owing to the saturation problem in the magnetic core shows impedance.Usually, inductor design is become can support the twice of conventional magnetic flux linkage can solve such saturation problem.But this will make size, weight and the expense of superconducting current limiter significantly increase.Abstract of invention
The invention relates to the superconducting current limiter that utilizes IEEE Std parallel highway magnetic resistance difference, specifically, the objective of the invention is to improve the current limiting performance of superconducting current limiter under the failure condition.
According to the present invention, magnetic circuit has the IEEE Std parallel highway that two and primary coil and secondary coil couple.Under low operating voltage (electric current), the inductance of the flux circuit of superconducting current limiter by there not being the space in the branch road and the conventional resistance of superconductor come fault current limiting.Under high working voltage (electric current), the inductance of the flux circuit of superconducting current limiter by having the space in the branch road and the conventional resistance of superconductor come fault current limiting.Usually, adopting in the branch road does not have the magnetic core in space to require 4 times ceiling capacity storage capability, thereby the inductor volume will increase by 4 times.In order to address this problem, can adopt magnetic circuit with IEEE Std parallel highway that two and primary coil and secondary coil couple.Have the branch road in space and do not have number scalable all of the branch road in space.Transformer, inductor and superconducting current limiter with this magnetic circuit have broad operating voltage.In the present invention, in order to improve current limiting performance, have additional damping coil on the branch road in space, damping coil can adopt short circuit superconductor (superconducting coil) or the conventional conductor (conventional conductive coil) of short circuit.Damping coil can be defined as short-circuit conductor.Have under the transient operation situation even have inductor, transformer and the superconducting current limiter of damping coil, also can keep the substantially invariable characteristic of impedance.If secondary coil 2 disconnects or not installation in the superconducting current limiter, superconducting current limiter can be used as inductor.If the secondary coil in the superconducting current limiter 2 is connected with load, superconducting current limiter can be used as transformer.The characteristic of inductor and transformer is similar with the characteristic of superconducting current limiter.Damping coil is disposed on the branch road with space.
Superconducting current limiter comprises primary coil 3 and secondary superconducting coil 2, they by magnetic core by magnetic coupling.Primary coil 3 and secondary coil 2 are arranged in the multiple branch circuit magnetic core with one heart, and especially, on the branch road of three branch road magnetic cores, primary coil 3 can adopt conventional conductive coil or superconducting coil, and secondary coil 2 can adopt short circuit superconducting coil or short circuit superconductor.On one of branch road 1A coil is arranged, another branch road 1B has space and damping coil.For the protective circuit element, the primary coil series connection is inserted in the power net road.Under normal circumstances, the induced current in the secondary superconducting coil causes magnetic flux elimination effect in magnetic core.Like this, the impedance of superconducting current limiter is low, and mainly by leakage inductance and the decision of primary coil resistance.Under failure condition, the induced current in the secondary superconducting coil reaches critical value, because superconductor shows the flux current dynamic resistance, thereby the magnetic flux in the magnetic core sharply increases, and this will cause its impedance sharply to increase.
Magnetic flux reaches saturation point in the flux circuit in space if do not have, and the magnetic resistance of flux circuit that does not have the space so is no longer littler than the magnetic resistance of flux circuit that another has the space.Flux circuit transfers the latter to from the former.The quantity of magnetic flux is by gap lengths and damping coil control.Thereby, can prevent that at saturation stage impedance from sharply reducing, greatly improved current limiting performance.
Brief Description Of Drawings
Fig. 1 is for describing the figure of magnetic flux elimination situation in the superconductor;
Fig. 2 illustrates an application of the superconducting current limiter of arrangement according to the invention in electrical network;
Fig. 3 illustrates the structure of the superconducting current limiter of first embodiment according to the invention;
Fig. 4 illustrates the structure according to the superconducting current limiter of second embodiment of the present invention;
Fig. 5 illustrates the structure according to the superconducting current limiter of the 3rd embodiment of the present invention;
Fig. 6 illustrates the structure according to the superconducting current limiter of the 4th embodiment of the present invention;
The detailed description of most preferred embodiment
Fig. 3 represents is first example according to superconducting current limiter of the present invention.Short circuit secondary coil 2 and primary coil 3 are arranged on the branch road 1A of magnetic core 1 with one heart.Two IEEE Std parallel highways with closed magnetic circuit 4 and closed magnetic circuit 5 of another band space A that couple with first polar curve circle 3 can be used.Can merge a collection of space A and a collection of IEEE Std parallel highway.Secondary coil 2 can be on branch road 1A with respect to the position of primary coil 3 or below, and the inboard or the outside.Otherwise primary coil 3 and secondary coil 2 can be arranged on branch road 1A and the 1C.
With respect to the layout of primary coil and the shape of magnetic core various designs can be proposed according to secondary coil.But,, most importantly to utilize magnetic circuit with the IEEE Std parallel highway that couples with primary coil 3 in order to control flowing of magnetic flux.
If conventional current flows in circuit, the induced current subcritical value in the superconducting coil 2 as shown in Figure 1.That is, because induced current flows along the direction of offsetting externally-applied magnetic field intensity H, by opposing magnetic field intensity-H, total magnetic field intensity is similar to " 0 ", thereby electric current is in Low ESR situation current downflow.The very low and main resistance decision of the impedance of superconducting current limiter by leakage inductance and elementary conventional conductive coil 3.Thereby under the normal condition, because the magnetic field intensity cancellation effect or the magnetic screening effect of superconducting coil 2, magnetic flux can not pass through magnetic core 1.
In order to simulate the failure condition in the electrical network, the load resistance RL shown in Fig. 2 becomes " 0 ".Like this, electric current in the primary coil 3 and the induced current in the secondary coil 2 sharply increase.Because the induced current in the superconducting coil 2 reaches critical level, no longer includes magnetic field cancellation, induced current will be in the situation current downflow of a constant impedance.Like this, magnetic field intensity-H does not produce, and impedance increases suddenly.Because impedance sharply increases, fault current can be limited to a desired level.That is,, do not need extra control unit can realize auto-conversion function by utilizing the proper property of superconductor.
Therefore, under the failure condition, because the induced current in the superconducting coil 2 surpasses critical current, the magnetic flux of superconducting coil 2 is eliminated effect or magnetic screening effect can be removed.So magnetic flux is by magnetic core 1, and impedance increases.If the magnetic flux of the close access 4 by there not being space A reaches the maximum flux in the magnetic core 1, because the magnetic resistance of close access 4 is greater than the magnetic resistance of the path 5 that comprises space A in saturation stage, magnetic flux path 5 rather than close access 4 just like this by comprising space A.The length controlled system magnetic flux of space A is higher than the saturation point in the path 4.Because the flow divert of magnetic flux comprises the quantity of the length controlled system magnetic flux of the path 5 of space A and space A and is higher than saturation point, thereby can prevent magnetic saturation, also can avoid the impedance reduction, thereby fault current limiting easily.
What Fig. 4 represented is second example of superconducting current limiter.Compare with Fig. 3, have the position change of the branch road of space A.Secondary coil 2 with respect to the position of primary coil 3 be on branch road 1A or below, and the inboard or the outside.Otherwise primary coil 3 and secondary superconducting coil 2 can be arranged on branch road 1A and the 1C.
What Fig. 5 represented is the 3rd example of superconducting current limiter.Damping coil 6, the conventional conductive coil of short circuit for example, the conventional conductor of short circuit, short circuit superconductor or short circuit superconducting coil are disposed on the branch road 1B with space A, improve current limiting performance in order that be higher than saturation point by control magnetic flux.If magnetic field intensity increases, also can produce saturated even introduce the space in the magnetic core 1.But, eliminate effect owing to be arranged in the magnetic flux of the damping coil 6 on the branch road 1B with space A, the magnetic flux of the branch road by having space A remains and is similar to " 0 ".Equally, the length of space A (that is the difference of IEEE Std parallel highway magnetic resistance) and damping coil 6 may command magnetic flux are higher than the saturation point of path 4.Because the flow divert of magnetic flux comprises the path 5 of space A and the length of space A and the quantity of damping coil 6 may command magnetic flux and is higher than saturation point, thereby can prevent magnetic saturation, also can avoid impedance to reduce, thereby greatly strengthen the living energy of current limliting.According to the layout of secondary coil 2 with respect to primary coil 3, core shapes, the position in gap lengths and damping coil and space can propose the various designs of superconducting current limiter.But basic design philosophy is to utilize magnetic circuit with two IEEE Std parallel highways that couple with primary coil 3 and damping coil 6 to control magnetic flux to be higher than saturation point.
What Fig. 6 represented is the 4th example of superconducting current limiter.Compare with Fig. 5, have the position change of the branch road 1B of space A.Damping coil is arranged on the branch road 1B.In addition, secondary coil 2 with respect to the position of primary coil 3 on branch road 1A or below, and the inboard or the outside.Otherwise primary coil 3 and secondary superconducting coil 2 can be arranged on branch road 1A and the 1C.
As another example, superconducting current limiter can be used as inductor.That is, primary coil is disposed on the branch road 1A of magnetic core 1 shown in Figure 5, and secondary coil disconnects or is not installed on branch road 1A or the 1C, and primary coil can adopt conventional conductive coil or superconducting coil.In this example, damping coil can be disposed on Fig. 5 and the branch road 1B with space A shown in Figure 6, and damping coil can adopt the conventional conductive coil of short circuit, short circuit conventional conductor, short circuit superconductor or short circuit superconducting coil.Because the characteristic of inductor and superconducting current limiter is similar, thereby, comprise that the various designs according to all situations of the arrangement of the shape of magnetic core and space, damping coil and primary coil can be contained among the present invention.
As another example, superconducting current limiter can be used as the special purpose transformer.Primary coil links to each other with the source part, and secondary coil 2 is connected with the load part, and primary coil can adopt superconductor, superconducting coil or conventional conductive coil, and secondary coil 2 can adopt superconductor, superconducting coil or conventional conductive coil.In this example, damping coil can be arranged on Fig. 5 and the branch road 1B with space A shown in Figure 6, and damping coil can adopt the conventional conductive coil of short circuit, short circuit conventional conductor, short circuit superconducting coil or short circuit superconductor.Fig. 5 and Fig. 6 have represented and the corresponding core shapes of the different arrangement of space, damping coil, primary coil and secondary coil.Secondary coil is with respect to the arrangement of primary coil, and the position of space and damping coil and the shape of magnetic core will cause various designs.But main design philosophy is consistent, thereby the example of various designs can be contained among the present invention.
Equally, superconducting current limiter can be used as the voltage transformer with damping coil and is used for control appliance.
As mentioned above, even under transient condition, magnetic circuit, space and damping coil with IEEE Std parallel highway that two and primary coil and secondary coil couple also can improve the current limiting performance of superconducting current limiter.Under failure condition, flux circuit turns to the flux circuit with space.Thereby, owing to kept the constant of impedance, fault current limiting effectively by control magnetic flux.Because the superconducting current limiter of invention adopts constant inductance, does not increase core volume extraly, thereby can greatly save design inductor expense.In addition, this superconducting current limiter also can be used in the various electric power systems.The capacity of the system that can increase electric power, and be easy to solve the requirement that electric power increases.In addition, have parallel flux circuit, can prevent magnetic saturation, eliminate effect by means of the magnetic flux of damping coil simultaneously and can improve current limiting performance owing to introduce the magnetic core in space.
Claims (8)
1. superconducting current limiter comprises:
Has a main magnetic branch road and a plurality of parallel magnetic branch road magnetic core with control magnetic flux on saturation point; By the magnetic flux path that the described main magnetic branch road with primary coil and described a plurality of parallel magnetic branch road are formed, at least two described parallel magnetic prop up a plurality of parallel branch with respect to main magnetic branch road of route and form;
Wherein, in the described magnetic flux path that magnetic flux is limited in being constituted or being made of magnetic material by magnetic material and space; The variable-length of described space and described magnetic flux path, thereby the magnetic resistance of the described magnetic flux path of scalable; Depend on along the variable cross-section of the position in described central flux path, thus the magnetic resistance of the described magnetic flux path of scalable;
Be installed in current limiting performance that enhancing is provided on the described parallel magnetic branch road and the damping coil of controlling magnetic flux quantity;
Wherein said damping coil adopts the conventional conductive coil of short circuit, the conventional conductor of short circuit, or employing short circuit superconducting coil or short circuit superconductor, more effective under superconducting state, damping coil utilizes the magnetic flux of short-circuit conductor to eliminate characteristic and controls that magnetic flux is higher than saturation point on the parallel magnetic branch road, described superconductor (or conventional conductor) comprises a plurality of superconductors (or conventional conductor), at least one described superconductor (or conventional conductor) comprises multiple parallel pathway part (part), and each parallel pathway part has the gap between it at least one superconductor (or conventional conductor).
2. superconducting current limiter as claimed in claim 1, wherein said primary coil and secondary coil have utilized superconductor and have surpassed critical current because induced current increases fast, and change the conversion characteristic of resistance state into from superconducting state, the primary coil that is installed on the described main magnetic branch road adopts superconducting coil or conventional conductive coil, and the secondary coil that is installed in described magnetic flux path adopts short circuit superconducting coil or short circuit superconductor.
3. superconducting current limiter as claimed in claim 2, wherein said secondary coil is with respect to the inboard or the outside at described main magnetic branch road, the position of described primary coil, and above or below, wherein said secondary coil and described primary coil are arranged on described main magnetic branch road and the described parallel magnetic branch road.
4. superconducting current limiter as claimed in claim 1, wherein said primary coil links to each other with the source part, and secondary coil disconnects or does not install, and described current-limiting apparatus can be used as the inductor of being with damping coil.
5. as claim 1 and the 4 described superconducting current limiters of inductor, also include and be installed in the primary coil that adopts superconducting coil or conventional conductive coil on the described main magnetic branch road as the band damping coil.
6. superconducting current limiter as claimed in claim 1, wherein said primary coil links to each other with the source part, and secondary coil links to each other with the load part, and described current-limiting apparatus can be used as the transformer of being with damping coil.
7. as claim 1 and 6 described superconducting current limiters, also include the primary coil that is installed in main magnetic branch road and be installed in the employing superconducting coil of described magnetic flux path or the secondary coil of conventional conductive coil as the transformer of being with damping coil.
8. superconducting current limiter as claimed in claim 7, wherein said secondary coil is with respect to the inboard or the outside at described main magnetic branch road, the position of described primary coil, and above or below, wherein said secondary coil and described primary coil are arranged on described main magnetic branch road and the described parallel magnetic branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97118655 CN1211802A (en) | 1997-09-18 | 1997-09-18 | Superconducting current limiting device having damping coils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97118655 CN1211802A (en) | 1997-09-18 | 1997-09-18 | Superconducting current limiting device having damping coils |
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| CN1211802A true CN1211802A (en) | 1999-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97118655 Pending CN1211802A (en) | 1997-09-18 | 1997-09-18 | Superconducting current limiting device having damping coils |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345319C (en) * | 2003-12-26 | 2007-10-24 | 北京云电英纳超导电缆有限公司 | Superconducting saturable core fault current limiter |
| CN100359776C (en) * | 2005-02-04 | 2008-01-02 | 北京云电英纳超导电缆有限公司 | Super-conductive fault current limiter with short-cut ring |
| CN102376411A (en) * | 2010-07-02 | 2012-03-14 | 布鲁克Hts有限公司 | Method for current conditioning, in particular on a fault current limiter |
| CN104600681A (en) * | 2015-01-28 | 2015-05-06 | 湖南大学 | Novel magnetic shielding inducting type superconducting fault current limiter |
| CN105288866A (en) * | 2014-05-26 | 2016-02-03 | 住友重机械工业株式会社 | Superconductive electromagnet device and charged particle beam therapeutic device |
| CN109727746A (en) * | 2019-01-07 | 2019-05-07 | 中国科学院合肥物质科学研究院 | Superconducting coil tightening regulator in a kind of superconductive current limiter |
| CN109964548A (en) * | 2016-11-17 | 2019-07-02 | Lg伊诺特有限公司 | DC-DC converter |
-
1997
- 1997-09-18 CN CN 97118655 patent/CN1211802A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345319C (en) * | 2003-12-26 | 2007-10-24 | 北京云电英纳超导电缆有限公司 | Superconducting saturable core fault current limiter |
| CN100359776C (en) * | 2005-02-04 | 2008-01-02 | 北京云电英纳超导电缆有限公司 | Super-conductive fault current limiter with short-cut ring |
| CN102376411A (en) * | 2010-07-02 | 2012-03-14 | 布鲁克Hts有限公司 | Method for current conditioning, in particular on a fault current limiter |
| CN102376411B (en) * | 2010-07-02 | 2015-09-30 | 布鲁克Hts有限公司 | For the method for the Current adjustment in Current adjustment, especially fault current limiter |
| CN105288866A (en) * | 2014-05-26 | 2016-02-03 | 住友重机械工业株式会社 | Superconductive electromagnet device and charged particle beam therapeutic device |
| CN104600681A (en) * | 2015-01-28 | 2015-05-06 | 湖南大学 | Novel magnetic shielding inducting type superconducting fault current limiter |
| CN109964548A (en) * | 2016-11-17 | 2019-07-02 | Lg伊诺特有限公司 | DC-DC converter |
| CN109964548B (en) * | 2016-11-17 | 2021-08-27 | Lg伊诺特有限公司 | DC-DC converter |
| US11251694B2 (en) | 2016-11-17 | 2022-02-15 | Lg Innotek Co., Ltd. | DC-DC converter |
| US11575313B2 (en) | 2016-11-17 | 2023-02-07 | Lg Innotek Co., Ltd. | DC-DC converter |
| CN109727746A (en) * | 2019-01-07 | 2019-05-07 | 中国科学院合肥物质科学研究院 | Superconducting coil tightening regulator in a kind of superconductive current limiter |
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