JP2573945B2 - Superconducting cable - Google Patents
Superconducting cableInfo
- Publication number
- JP2573945B2 JP2573945B2 JP62092806A JP9280687A JP2573945B2 JP 2573945 B2 JP2573945 B2 JP 2573945B2 JP 62092806 A JP62092806 A JP 62092806A JP 9280687 A JP9280687 A JP 9280687A JP 2573945 B2 JP2573945 B2 JP 2573945B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- superconducting
- ceramic layer
- superconducting cable
- oxide
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、酸化物系超電導材料を用いた超電導ケーブ
ルに関するものである。Description: TECHNICAL FIELD The present invention relates to a superconducting cable using an oxide-based superconducting material.
［従来の技術］ 近来、常電導状態から超電導状態へ遷移する臨界温度
（Tc）が、液体窒素温度以上の高い値を示す超電導材料
が種々発見されつつあり、さらに、この超電導材料によ
って超電導ケーブルが作られている。この超電導ケーブ
ルは、極低温で電気抵抗の低い銅等のパイプの内部に超
電導材料が入れられ、これが押出、伸線などの工程によ
って線状にされ、銅パイプの周囲にワニスまたはテープ
等の絶縁体が被覆されているものが一般的であり、超電
導導体が超電導性を発揮する温度にまで冷却されて使用
されている。[Prior art] In recent years, various superconducting materials having a critical temperature (Tc) at which a transition from a normal conducting state to a superconducting state has a high value equal to or higher than the temperature of liquid nitrogen are being discovered. It is made. In this superconducting cable, a superconducting material is put inside a pipe made of copper or the like having a low electric resistance at a very low temperature, and this is made into a linear shape by a process such as extrusion or drawing, and an insulating material such as varnish or tape is wrapped around the copper pipe. The body is generally covered, and is used after being cooled to a temperature at which the superconducting conductor exhibits superconductivity.
［発明が解決しようとする問題点］ ところで、このような超電導ケーブルの場合、耐熱性
が十分ではなく、また、絶縁体の誘電正接（tan δ）や
誘電率（ε）が比較的大きいので、誘電体損が大きく発
熱の問題を有している。[Problems to be Solved by the Invention] In the case of such a superconducting cable, heat resistance is not sufficient, and the dielectric loss tangent (tan δ) and dielectric constant (ε) of the insulator are relatively large. The dielectric loss is large and there is a problem of heat generation.
本発明は、前記問題点を解消するためになされたもの
で、電流ロスがなく、導体の径が小さくとも大電流を流
すことができるとともに、十分な耐熱性を有し、誘電正
接や誘電率が少なく、誘電体損も小さく、発熱も少ない
超電導ケーブルを提供することを目的とする。The present invention has been made in order to solve the above problems, and has no current loss, can flow a large current even if the diameter of the conductor is small, has sufficient heat resistance, and has a dielectric loss tangent and a dielectric constant. It is an object of the present invention to provide a superconducting cable having a small amount of heat, a small dielectric loss, and a small heat generation.
［問題点を解決するための手段］ 本発明の超電導ケーブルは、上記問題点を解決するた
めになされたものであって、内部に冷媒通路を形成した
中空の導体の外部に、この導体を覆う中空の酸化物系超
電導導体を設け、この酸化物系超電導導体の周囲にセラ
ミックス層を被覆し、その周囲に更に保護層を被覆して
なることを特徴としている。[Means for Solving the Problems] A superconducting cable according to the present invention has been made in order to solve the above problems, and covers a hollow conductor having a refrigerant passage formed therein, outside the hollow conductor. A hollow oxide superconductor is provided, a ceramic layer is coated around the oxide superconductor, and a protective layer is further coated around the ceramic layer.
［作用］ 本発明の超電導ケーブルによれば、超電導導体を用い
ることによって電流ロスが全くなく細径でも大電流を流
すことができるとともに、セラミックス製の絶縁体を被
覆することにより、十分な耐熱性を有し、また、超電導
導体の内部の導体内に冷媒を流すことにより超電導導体
と絶縁体を冷却する。更に、冷媒通路を設けた導体は、
酸化物系超電導導体が何らかの要因によって超電導性を
失った場合に予備の導体となる。[Operation] According to the superconducting cable of the present invention, the use of a superconducting conductor allows a large current to flow even with a small diameter without any current loss, and by coating a ceramic insulator, sufficient heat resistance is obtained. In addition, a superconductor and an insulator are cooled by flowing a coolant through a conductor inside the superconductor. Further, the conductor provided with the refrigerant passage is:
When the oxide-based superconducting conductor loses superconductivity for some reason, it becomes a spare conductor.
［実施例］ 図は本発明に基づいて形成された超電導ケーブルの一
実施例を示す断面図である。Embodiment FIG. 1 is a sectional view showing an embodiment of a superconducting cable formed according to the present invention.
この超電導ケーブルは、内部に冷媒通路１が設けられ
た導体２の外部に、酸化物系の超電導導体３、内部半導
電層４、セラミックス層（セラミックス製の絶縁体）５
が順次設けられ、さらにこのセラミックス層５の外部
に、外部半導電層６、外部導体７、クロロプレンあるい
は塩化ビニル製の防食保護層８が順次設けられている。This superconducting cable has an oxide superconducting conductor 3, an internal semiconductive layer 4, and a ceramic layer (insulator made of ceramics) 5 outside a conductor 2 having a refrigerant passage 1 provided therein.
In addition, an external semiconductive layer 6, an external conductor 7, and an anticorrosion protective layer 8 made of chloroprene or vinyl chloride are sequentially provided outside the ceramic layer 5.
前記セラミックス層５は、アルミナ（Al2O3）等でで
きており、発泡剤や発泡材料を混入した組成物を加熱加
圧成形をすることにより絶縁ピースとされたものであ
る。このセラミックス層５には、連続気泡のみによるも
の、もしくは連続気泡と単独気泡を混在させたものが用
いられ、気泡の中に、たとえばSF6ガス、N2ガス、フロ
ンガス等の絶縁性ガスが充填されている。The ceramic layer 5 is made of alumina (Al 2 O 3 ) or the like, and is formed into an insulating piece by subjecting a composition containing a foaming agent or a foaming material to heat and pressure molding. The ceramic layer 5 is made of only open cells or a mixture of open cells and single cells, and is filled with an insulating gas such as SF 6 gas, N 2 gas, or Freon gas. Have been.
また、内部半導電層４および外部半導電層６は、カー
ボンブラック入のセラミックスからなり、必要に応じて
前記セラミックス層５と同時に成形加工することができ
るものである。Further, the inner semiconductive layer 4 and the outer semiconductive layer 6 are made of ceramic containing carbon black, and can be formed simultaneously with the ceramic layer 5 if necessary.
また、前記酸化物系の超電導導体３は、内部半導電層
４の内面に、たとえばプラズマ溶射等の手段により薄膜
状に形成されたもの、あるいは超電導導体の原料粉末を
圧粉成形した後に熱処理して形成したものなどである。
なお、その組成は、Ａ−Ｂ−Cu−Ｏ（但し、ＡはLa、C
e、Ｙ、Sc、Yb等のIII a族元素の１種、ＢはSr、Ba等の
アルカリ土類金属元素の１種を表す）とされるものであ
る。The oxide-based superconducting conductor 3 is formed on the inner surface of the inner semiconductive layer 4 into a thin film by means of, for example, plasma spraying, or is subjected to a heat treatment after compaction molding of a raw powder of the superconducting conductor. And the like.
The composition is AB—Cu—O (where A is La, C
e, one kind of group IIIa element such as Y, Sc and Yb, and B represents one kind of alkaline earth metal element such as Sr and Ba).
前記導体２は、極低温で電気抵抗の低い銅等でできて
おり、酸化物系超電導導体３が何らかの要因によって超
電導性を失った場合に使用される予備の導体である。The conductor 2 is made of copper or the like having a low electric resistance at a very low temperature, and is a spare conductor used when the oxide-based superconducting conductor 3 loses superconductivity due to some factor.
以上の構成による超電導ケーブルによれば、酸化物系
の超電導導体３の外部に設けられる絶縁体をセラミック
ス層５としたから、十分な耐熱性を有するものとなって
いる。本例のアルミナの場合であれば、その耐熱温度は
約1200℃と非常に高い。さらに、セラミックス層５にSF
6ガス等の絶縁性ガスを充填することにより、耐電圧性
能も一段と向上させることができる。According to the superconducting cable having the above-described configuration, the insulator provided outside the oxide-based superconducting conductor 3 is the ceramic layer 5, so that the cable has sufficient heat resistance. In the case of the alumina of this example, the heat resistance temperature is as high as about 1200 ° C. Furthermore, SF is applied to the ceramic layer 5.
By filling with an insulating gas such as six gases, the withstand voltage performance can be further improved.
また、セラミックス層５は、誘電正接（tanδ）や誘
電率（ε）が小さいから誘電体損がきわめて小さく、こ
のため発熱も少なく、また、冷媒通路１の内部の冷媒で
セラミックス層５も冷却することができる。Further, the ceramic layer 5 has a very small dielectric loss due to a small dielectric loss tangent (tan δ) and a low dielectric constant (ε), and therefore generates little heat. Further, the ceramic layer 5 is cooled by the refrigerant inside the refrigerant passage 1. be able to.
さらに、内部半導電層４および外部半導電層６を設け
たセラミックス層５を連続的に配置することにより、偏
心や振動に対しても対応することが可能である。Furthermore, by arranging the ceramic layer 5 provided with the inner semiconductive layer 4 and the outer semiconductive layer 6 continuously, it is possible to cope with eccentricity and vibration.
なお、上記実施例のセラミックス層５はアルミナ（Al
2O3）を用いたが、この他に、SiO2、2MgO、2Al2O3、5Si
O2、MgO、Cr2O3、ZrO2、等の酸化物系のセラミックス、
あるいはSiC、Si3N4、BN、AlN等の非酸化物系のセラミ
ックスを用いてもよい。The ceramic layer 5 of the above embodiment is made of alumina (Al
2 O 3 ), but also SiO 2 , 2MgO, 2Al 2 O 3 , 5Si
Oxide ceramics such as O 2 , MgO, Cr 2 O 3 , ZrO 2 , etc.
Alternatively, non-oxide ceramics such as SiC, Si 3 N 4 , BN, and AlN may be used.
［発明の効果］ 以上説明したように、本発明の超電導ケーブルによれ
ば、内部に冷媒通路が形成された導体の外部に設けた酸
化物系超電導導体の周囲にセラミックス製の絶縁体が被
覆されてなるから、電流ロスがなく、導体の径が小さく
とも大電流を流すことができるとともに、十分な耐熱性
を有している。[Effects of the Invention] As described above, according to the superconducting cable of the present invention, a ceramic insulator is coated around an oxide-based superconducting conductor provided outside a conductor having a refrigerant passage formed therein. Therefore, there is no current loss, a large current can flow even if the diameter of the conductor is small, and sufficient heat resistance is provided.
また、耐熱性に優れていることから、誘電正接（tan
δ）や誘電率（ε）も小さくなり、これによって誘電体
損がきわめて小さく、発熱も少なくすることができる。
更に、冷媒通路を設けた導体は、酸化物系超電導導体が
何らかの要因によって超電導性を失った場合に予備の導
体となる。In addition, because of its excellent heat resistance, the dielectric loss tangent (tan
δ) and the dielectric constant (ε) are also reduced, so that dielectric loss is extremely small and heat generation can be reduced.
Further, the conductor provided with the refrigerant passage becomes a spare conductor when the oxide-based superconducting conductor loses superconductivity for some reason.
図は本発明の一実施例を示す超電導ケーブルの断面図で
ある。 １……冷媒通路、 ２……導体、 ３……超電導導体、 ５……セラミックス層（セラミックス製の絶縁体）。FIG. 1 is a sectional view of a superconducting cable showing one embodiment of the present invention. 1 ... refrigerant passage, 2 ... conductor, 3 ... superconducting conductor, 5 ... ceramic layer (ceramic insulator).
Claims (1)
外部に、この導体を覆う中空の酸化物系超電導導体が設
けられ、この酸化物系超電導導体の周囲にセラミックス
層が被覆され、このセラミックス層の周囲に保護層が被
覆されてなることを特徴とする超電導ケーブル。1. A hollow oxide superconducting conductor is provided outside a hollow conductor in which a coolant passage is formed, and a ceramic layer is coated around the oxide superconducting conductor. A superconducting cable characterized in that a protective layer is coated around the ceramic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62092806A JP2573945B2 (en) | 1987-04-15 | 1987-04-15 | Superconducting cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62092806A JP2573945B2 (en) | 1987-04-15 | 1987-04-15 | Superconducting cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63259918A JPS63259918A (en) | 1988-10-27 |
| JP2573945B2 true JP2573945B2 (en) | 1997-01-22 |
Family
ID=14064657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62092806A Expired - Lifetime JP2573945B2 (en) | 1987-04-15 | 1987-04-15 | Superconducting cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573945B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948251B (en) * | 2021-10-19 | 2023-10-10 | 广东电网有限责任公司 | Insulating structure of superconducting cable |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241811A (en) * | 1987-03-28 | 1988-10-07 | Sumitomo Electric Ind Ltd | Superconducting cable |
| JPS63259928A (en) * | 1987-04-06 | 1988-10-27 | Yokogawa Hewlett Packard Ltd | Manufacture of superconductive wire |
-
1987
- 1987-04-15 JP JP62092806A patent/JP2573945B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63259918A (en) | 1988-10-27 |
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