JPH01110021A - Superconductive current-limiting element - Google Patents
Superconductive current-limiting elementInfo
- Publication number
- JPH01110021A JPH01110021A JP62266283A JP26628387A JPH01110021A JP H01110021 A JPH01110021 A JP H01110021A JP 62266283 A JP62266283 A JP 62266283A JP 26628387 A JP26628387 A JP 26628387A JP H01110021 A JPH01110021 A JP H01110021A
- Authority
- JP
- Japan
- Prior art keywords
- current
- state
- superconductor
- magnetic field
- critical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002887 superconductor Substances 0.000 claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 abstract description 7
- 230000007704 transition Effects 0.000 abstract description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は電気機器において定格電流以上の電流を制限す
る限流素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a current limiting element for limiting a current exceeding a rated current in electrical equipment.
「従来の技術」
従来の限流素子の例として、ナトリウム限流素子を上げ
る。"Prior Art" A sodium current limiting element is cited as an example of a conventional current limiting element.
この限流素子は第４図に示すように、基本的には２つの
電流端子５．１０の間を電気的に接続する固体のナトリ
ウム電路６ならびにピストンによる圧力緩衝要素７とか
らなっている。定常負荷電流が流れているときは、ナト
リウムは固体の状態で低い抵抗値を示しているが、定格
電流以上の電流が流れるとナトリウム電路６は自己のジ
ュール発熱によって急速に液化から気化し、高温・高圧
・高抵抗のプラズマ状態となって、電流端子５．１０間
の抵抗が患部に増加する。このため電流は限流され、あ
る一定値以下に抑制される。限流された電流の遮断は、
図示されない直列開閉器でなされる。電流が遮断される
と、冷却と不活性ガス８による背圧により、ナトリウム
は速やかにもとの固体になり、引き続いて負荷電流を流
すことができるのが普通である。As shown in FIG. 4, this current limiting element basically consists of a solid sodium conductor 6 electrically connecting two current terminals 5, 10 and a pressure damping element 7 by means of a piston. When a steady load current is flowing, sodium exhibits a low resistance value in a solid state, but when a current exceeding the rated current flows, the sodium conductor 6 rapidly liquefies and vaporizes due to its own Joule heat generation, reaching a high temperature. - A high-voltage, high-resistance plasma state is created, and the resistance between the current terminals 5 and 10 increases in the affected area. Therefore, the current is limited and suppressed to a certain value or less. Interrupting the limited current is
This is done with a series switch (not shown). When the current is interrupted, the cooling and back pressure provided by the inert gas 8 typically causes the sodium to quickly return to its solid state, allowing subsequent load current to flow.
限流された・エネルギーはジュール熱及び、ナトリウム
の体積増に変換されることになるが、熱はべりリア９と
特殊セラミックス１１に吸収、放散し、体積増に伴う圧
力増は圧力緩衝要素７を介して不活性ガス８が緩衝を分
担する。また素子の容器は、高温、高圧に耐えられるよ
うに強力鋼１２でできているのが普通である。The limited energy will be converted into Joule heat and an increase in the volume of sodium, but the heat will be absorbed and dissipated by the beliar 9 and the special ceramics 11, and the pressure increase due to the increase in volume will cause the pressure buffer element 7 to An inert gas 8 acts as a buffer via the buffer. Further, the container for the device is usually made of high-strength steel 12 so that it can withstand high temperatures and pressures.
「発明が解決しようとする問題点」
従来の限流素子は、活性なナトリウムを用いておりその
取扱が技術的に困難である。また、素子内部の構造が複
雑で高価である。この素子の構造を簡素化し、制御装置
全体を小形、低価格化することが問題となっている。"Problems to be Solved by the Invention" Conventional current limiting elements use active sodium, which is technically difficult to handle. Furthermore, the internal structure of the element is complicated and expensive. The problem is to simplify the structure of this element and to make the entire control device smaller and cheaper.
本発明は、限流素子の構造を簡素化し、限流素子の価格
低減を目的とする。The present invention aims to simplify the structure of a current limiting element and reduce the cost of the current limiting element.
「問題点を解決するための手段」
漏電導体は、臨界電流と臨界磁界の一方あるいは両者が
それを超えると、超電導体の状態から常電導体の状態に
なる。本発明は、この超電導体特有の性質を用いて上記
の目的を達成させるものである。すなわち、超電導体の
まわりに磁界を発生させるためのコイルをおく。このコ
イルの材料は超電導材でも常電導材でもよい。このコイ
ルの一端は、素子を流れる電流回路と接続点３と３ａで
直列に接続し、電流が流れたときの電流がそのまま磁界
発、生の電源になるようにする。``Means for Solving the Problems'' When one or both of the critical current and critical magnetic field exceeds the critical current and/or critical magnetic field, the leakage conductor changes from the state of a superconductor to the state of a normal conductor. The present invention uses the unique properties of this superconductor to achieve the above object. That is, a coil is placed around the superconductor to generate a magnetic field. The material of this coil may be a superconducting material or a normal conducting material. One end of this coil is connected in series with the current circuit flowing through the element at connection points 3 and 3a, so that when the current flows, the current directly generates a magnetic field and becomes a raw power source.
「作用」
定格電流以上の電流が流れると、超電導体１に、流れる
電流とコイル２に流れる電流が増加し、コイルが超電導
体に与える磁界も増加する。この結果、超電導体は常電
導体の状態に転移し、抵抗が増加する。これによって、
電流は限流される。"Effect" When a current higher than the rated current flows, the current flowing through the superconductor 1 and the current flowing through the coil 2 increase, and the magnetic field that the coil applies to the superconductor also increases. As a result, the superconductor transitions to a normal conductor state and its resistance increases. by this,
Current is limited.
「実施例」
第１図及び第２図は本発明の一実施例を示すもので、棒
状の超電導体１の両端には接続点３．３ａが形成されて
いる。まなこの超電導体１の外周部にはコイル２があり
、このコイル２の一端は、前記接続点３ａに接続されて
いる。さらに前記接続端子３と前記コイル２の他端とに
は、図示されない回路との接続端子４．４ａが必要に応
じてそれぞれ接続されている。Embodiment FIGS. 1 and 2 show an embodiment of the present invention, in which connection points 3.3a are formed at both ends of a rod-shaped superconductor 1. There is a coil 2 on the outer periphery of the superconductor 1, and one end of the coil 2 is connected to the connection point 3a. Further, connection terminals 4.4a to a circuit (not shown) are connected to the connection terminal 3 and the other end of the coil 2, respectively, as required.
回路に定常負荷電流が流れている場合は、素子に流れる
電流、コイル２から発生する磁界の両方とも、超電導体
１が、第３図に示す超電導体の状態ａに位置するように
設定されている。ここで、素子に定格以上の電流が流れ
ると、超電導体１は第３図において臨界電流と臨界磁界
の一方あるいは両者のそれを超えるので、超電導の状９
ａから常電導の状態すになり、限流素子の抵抗は急激に
増加する。このため電流は限流され、ある一定値以下に
電流が抑制される。定格電流以上の電流が除去されると
、電流値、磁界の強さとも低下し、素子は常電導体の状
態すから超電導体の状Ｂａになり、通常時の素子の状態
に自動的に復帰する。When a steady load current is flowing in the circuit, both the current flowing through the element and the magnetic field generated from the coil 2 are set so that the superconductor 1 is located in the superconductor state a shown in FIG. There is. Here, when a current exceeding the rated value flows through the element, the superconductor 1 exceeds either or both of the critical current and critical magnetic field in FIG. 3, so the superconducting state 9
From point a to normal conduction, the resistance of the current limiting element increases rapidly. Therefore, the current is limited, and the current is suppressed below a certain certain value. When the current exceeding the rated current is removed, both the current value and the strength of the magnetic field decrease, and the element changes from the state of a normal conductor to the state of a superconductor Ba, and automatically returns to the normal state of the element. do.
なお、超電導体の特性は成分、製法によって異なる。本
発明の超電導となる温度は特に規定していない。しかし
ＯＫ以上いずれの温度でもその効果は変わらないことは
明らかである。Note that the characteristics of superconductors vary depending on the components and manufacturing method. The temperature at which superconductivity is achieved in the present invention is not particularly specified. However, it is clear that the effect remains the same at any temperature above OK.
また、超電導体１は電流密度を上げるなめ、超電導体１
の断面積はコイル２の断面積と同じか小さくすることも
できる。さらに磁界を発生させるコイルについても、電
磁力を受けてコイルが変形しないように工夫されている
ことは当然である。In addition, since superconductor 1 increases the current density, superconductor 1
The cross-sectional area of the coil 2 can be the same as or smaller than the cross-sectional area of the coil 2. Furthermore, the coil that generates the magnetic field is naturally designed to prevent the coil from being deformed by electromagnetic force.
「発明の効果」
以上述べたように、本発明は、超電導材料特有の臨界磁
場、臨界電流による材料特性の転移を利用したなめ、従
来の限流素子にみられる高度な技術が不要となる。また
、素子そのものの構造が簡素化されるため、小型、軽量
化が可能になり、素子の価格低減にもつながる。"Effects of the Invention" As described above, the present invention utilizes the transition of material properties due to the critical magnetic field and critical current specific to superconducting materials, and therefore does not require advanced technology found in conventional current limiting elements. Furthermore, since the structure of the element itself is simplified, it can be made smaller and lighter, leading to a reduction in the price of the element.
第１図は本発明の限流素子の断面図であり、第２図はそ
の外観図、第３図は超電導材料における臨界磁界と臨界
電流の関係の一例を示したものである。第４図は従来の
限流素子の一例であるナトリウム限流素子の構造図。
１は超電導体、２はコイル、３．３ａは接続点、４．４
ａは端子、ａは超電導体の状態、ｂは常電導体の状態で
ある。
特許出願人 株式会社 高岳製作所
第１図
第３図FIG. 1 is a sectional view of the current limiting element of the present invention, FIG. 2 is an external view thereof, and FIG. 3 is an example of the relationship between critical magnetic field and critical current in a superconducting material. FIG. 4 is a structural diagram of a sodium current limiting element, which is an example of a conventional current limiting element. 1 is the superconductor, 2 is the coil, 3.3a is the connection point, 4.4
a is a terminal, a is a superconductor state, and b is a normal conductor state. Patent applicant: Takatake Seisakusho Co., Ltd. Figure 1 Figure 3
Claims (1)
電導体からなるヒューズ本体を有し、コイルと超電導体
ヒューズを接続してなる超電導限流素子。A superconducting current limiting element that has a fuse body made of a superconductor inside a coil made of a superconductor or a normal conductor, and the coil and the superconductor fuse are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266283A JPH01110021A (en) | 1987-10-23 | 1987-10-23 | Superconductive current-limiting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62266283A JPH01110021A (en) | 1987-10-23 | 1987-10-23 | Superconductive current-limiting element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01110021A true JPH01110021A (en) | 1989-04-26 |
Family
ID=17428800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62266283A Pending JPH01110021A (en) | 1987-10-23 | 1987-10-23 | Superconductive current-limiting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01110021A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01164231A (en) * | 1987-12-17 | 1989-06-28 | Sanyo Electric Co Ltd | Solar photovoltaic power generating system |
-
1987
- 1987-10-23 JP JP62266283A patent/JPH01110021A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01164231A (en) * | 1987-12-17 | 1989-06-28 | Sanyo Electric Co Ltd | Solar photovoltaic power generating system |
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