JPS584406B2 - How to get the best results - Google Patents
How to get the best resultsInfo
- Publication number
- JPS584406B2 JPS584406B2 JP50039976A JP3997675A JPS584406B2 JP S584406 B2 JPS584406 B2 JP S584406B2 JP 50039976 A JP50039976 A JP 50039976A JP 3997675 A JP3997675 A JP 3997675A JP S584406 B2 JPS584406 B2 JP S584406B2
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- conductor
- cable
- wire
- heating wire
- 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
Links
- 239000004020 conductor Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 4
- 239000002887 superconductor Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
- Gas Or Oil Filled Cable Accessories (AREA)
Description
【発明の詳細な説明】 本発明は交流用超電導ケーブルの解磁方法に関する。[Detailed description of the invention] The present invention relates to a method for demagnetizing an AC superconducting cable.
超電導ケーブルでは一般に第２種超電導体が使用される
。Type 2 superconductors are generally used in superconducting cables.
第２種超電導体には周知のとうり２つの臨界磁場Ｈｃ１
とＨｃ２とが存在し、ＨＣ１を超えてＨｃ１＜Ｈ〈Ｈｃ
２の状態の磁場の下では導体中に磁束が侵入する。As is well known, there are two critical magnetic fields Hc1 in type 2 superconductors.
and Hc2 exist, and exceeds HC1 so that Hc1<H<Hc
Under the magnetic field in state 2, magnetic flux penetrates into the conductor.
交流用超電導ケー冫ルにおいては、磁場が全く導体中に
存在しない場合には、導体は第１種超電導体とまゝ似た
性質を示し、ロスが少ないため、通常はこの状態で使用
する。In AC superconducting cables, when no magnetic field exists in the conductor, the conductor exhibits properties similar to those of type 1 superconductors and has little loss, so it is usually used in this state.
しかし、過電流がケーブルに流れて上述のように導体中
に磁束が侵入すると、交流損が増大し、一旦このように
ＨＣ１を超えるとたとえ電流が定常状態に復帰しても導
体に電流が流れつつけ、磁場が導体の中へトラツプされ
る。However, when an overcurrent flows through the cable and magnetic flux enters the conductor as described above, AC loss increases, and once HC1 is exceeded, even if the current returns to a steady state, current will flow through the conductor. The magnetic field is trapped inside the conductor.
このような状態でケーブルを使用しても残存電流と正規
の電流が重畳するため交流損はさらに増大する。Even if the cable is used in this condition, the residual current and normal current will overlap, further increasing the AC loss.
これをさけて初期の状態に戻すだめには一度超電導を破
り磁場を開放してやる必要がある。To avoid this and return to the initial state, it is necessary to break the superconductivity and release the magnetic field.
このためには過電流を流しだ後は一度冷却を停止し温度
を上げて超電導状態を破り、再び冷却して超電導状態を
作らなければならないが、これはケーブルの熱伸縮や冷
却媒体の回収等の点から見てもきわめて煩雑な作業とな
る。To do this, after flowing an overcurrent, it is necessary to stop cooling, raise the temperature to break the superconducting state, and then cool it again to create a superconducting state, but this requires thermal expansion and contraction of the cable, recovery of the cooling medium, etc. From this point of view, this is an extremely complicated task.
２ 本発明は、上記の点に着目してなされたものでケー
ブル導体中に設けた発熱線に短時間大電流を流して一瞬
超電導状態を破懐することにより、ケーブル導体中の残
存電流を除去することを特徴とする交流用超電導ケーブ
ルの解磁方法に関するものである。2 The present invention has been made with attention to the above point, and the residual current in the cable conductor is removed by passing a large current for a short period of time through the heating wire provided in the cable conductor to momentarily break the superconducting state. The present invention relates to a method for demagnetizing an AC superconducting cable.
本発明の実施に適する超電導ケーブルの実例を第１図〜
第３図に示す。Examples of superconducting cables suitable for carrying out the present invention are shown in Figs.
It is shown in Figure 3.
第１図は同軸型超電導ケーブルの断面を示し、１は一面
に超電導体３を密着させた安定化導体２を絶縁処理した
超電導素線で、各素線ぱケーブル長手方向にケーブル軸
を中心としてスパイラル状より番わされている。Figure 1 shows a cross section of a coaxial superconducting cable. 1 is a superconducting strand in which a stabilizing conductor 2 with a superconductor 3 in close contact with one side is insulated. It is arranged in a spiral pattern.
４は本発明の実施に使用する発熱線、例えば絶縁銅線で
、すべての超電導素線１間により込まれている。Reference numeral 4 denotes a heat-generating wire, such as an insulated copper wire, used to carry out the present invention, which is inserted between all the superconducting strands 1.
５は中心導体と外部導体間を隔離する絶縁スペーサーで
ある。5 is an insulating spacer that isolates the center conductor from the outer conductor.
第２図は発熱線４を超電導素線１の間に設けず、超電導
素線１と絶縁スペーサ−５との間に設けた例を示す。FIG. 2 shows an example in which the heating wire 4 is not provided between the superconducting wires 1, but is provided between the superconducting wires 1 and the insulating spacer 5.
この場合発熱線はテープ状のものでもよい。In this case, the heating wire may be in the form of a tape.
第３図は超電導素線１の安定化導体２中に絶縁４１を施
しだ発熱線４をうめ込んだ例を示す。FIG. 3 shows an example in which a heating wire 4 provided with insulation 41 is embedded in a stabilizing conductor 2 of a superconducting wire 1.
上述のいずれのケーブルにおいても、万一過電流が流れ
て磁場がＨｃ１以上になった場合には、ただちに発熱線
４に短時間大電流を流し、即ちパル．ス状の電流を流す
ことによって瞬間的に超電導体の残存電流が流れている
部位の温度を臨界温度以上に上昇させ、解磁を行なう。In any of the above-mentioned cables, if an overcurrent flows and the magnetic field becomes Hc1 or higher, a large current is immediately passed through the heating wire 4 for a short time, that is, the pulse. By passing a current in the form of a strip, the temperature of the part of the superconductor where the residual current is flowing is momentarily raised above the critical temperature, thereby demagnetizing the superconductor.
こうすればケープルはだマちにもとの性能を回復し、継
続使用が可能となる。This will restore the original performance of the cable pad and allow continued use.
実施例として、内部導体外径２．５ｃｍ外部導体内径４
．５ｃｍの超電導ケーブルにおいて、超電導素線はそれ
ぞれ５×２，５ｘ１［ｍｍｌ角のホルマール絶縁平角導
体を各１５．２７本使用し、両者共に撚り合せピッチ４
５ｃｍで撚り合せた構成のもので、各超電導素線の下側
まだは上側にホルマール絶縁ニクロム線（外径１．０ｍ
ｍ）を挿入したものを製造した。As an example, the inner conductor outer diameter is 2.5 cm and the outer conductor inner diameter is 4 cm.
．． In the 5cm superconducting cable, 15.27 formal insulated rectangular conductors of 5 x 2 and 5 x 1 mm square are used as superconducting wires, and both have a twisting pitch of 4.
The structure consists of strands of 5 cm each, with formal insulated nichrome wires (outer diameter 1.0 m) on the bottom and top of each superconducting wire.
A product in which m) was inserted was manufactured.
上記超電導素線は、平角銅線から成る安定化導体の一面
に厚さ０．１ｍｍのＮｂテープ層が設けられており、９
．１７°Ｋ以下の温度で超電導状態となる。The above-mentioned superconducting wire has a 0.1 mm thick Nb tape layer provided on one side of a stabilizing conductor made of rectangular copper wire.
．． It becomes superconducting at temperatures below 17°K.
このケーブルは、一般にＨｅを用いて冷却され６°Ｋ程
度で使用される。This cable is generally cooled using He and used at about 6°K.
ここで、上記ニクロム線に１０Ａの電流を約０．１秒間
流すと、瞬間的に超電導素線は１０〜１２°Ｋ程度まで
温度上昇した。When a current of 10 A was passed through the nichrome wire for about 0.1 seconds, the temperature of the superconducting wire instantaneously rose to about 10 to 12 degrees K.
再び６°Ｋまで温度が低下するのに約１５秒程度の時間
を要したが、この間に超電導体中にトラツプされた磁束
は完全に消滅した。It took about 15 seconds for the temperature to drop to 6°K again, but during this time the magnetic flux trapped in the superconductor completely disappeared.
なお、前述したテープ状発熱線や埋め込み発熱線を用い
ると、発熱線と超電導体との接触面積が増大し、その間
の熱の伝達効率が良くなり、さらに解磁がすみやかに行
なわれることは言うまでもない。It goes without saying that when the tape-shaped heating wire or embedded heating wire described above is used, the contact area between the heating wire and the superconductor is increased, the heat transfer efficiency between them is improved, and furthermore, demagnetization is carried out quickly. stomach.
発熱線の材料としては、線径の比較的細い銅やアルミ線
の他にその発熱要求量に応じて各種合金線を用いること
が可能である。As the material for the heating wire, in addition to copper or aluminum wire with a relatively small wire diameter, various alloy wires can be used depending on the required amount of heat generation.
以上のように、本発明の方法によればきわめて短時間に
交流用超電導ケーブルの解磁ができ、その実用性は多犬
なものである。As described above, according to the method of the present invention, an AC superconducting cable can be demagnetized in an extremely short period of time, and its practicality is numerous.
第１図、第２図及び第３図は本発明の実施に好適する交
流用超電導ケーブルの部分横断面図で、１は超電導素線
、４は発熱線を示している。1, 2, and 3 are partial cross-sectional views of an AC superconducting cable suitable for carrying out the present invention, in which 1 indicates a superconducting wire and 4 indicates a heating wire.
Claims (1)
流を流して一瞬超電導状態を破壊することにより、ケー
ブル導体中の残存電流を除去することを特徴とする交流
用超電導ケーブル解磁方法。1. A method for demagnetizing an AC superconducting cable, characterized in that residual current in the cable conductor is removed by passing a large current for a short time through a heating wire provided in contact with a superconducting wire to momentarily destroy the superconducting state. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50039976A JPS584406B2 (en) | 1975-04-01 | 1975-04-01 | How to get the best results |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50039976A JPS584406B2 (en) | 1975-04-01 | 1975-04-01 | How to get the best results |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51114686A JPS51114686A (en) | 1976-10-08 |
| JPS584406B2 true JPS584406B2 (en) | 1983-01-26 |
Family
ID=12567968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50039976A Expired JPS584406B2 (en) | 1975-04-01 | 1975-04-01 | How to get the best results |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS584406B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61287807A (en) * | 1985-06-14 | 1986-12-18 | Tokai Rubber Ind Ltd | Structure of suspension bush assembly used in suspension mechanism for vehicle |
-
1975
- 1975-04-01 JP JP50039976A patent/JPS584406B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61287807A (en) * | 1985-06-14 | 1986-12-18 | Tokai Rubber Ind Ltd | Structure of suspension bush assembly used in suspension mechanism for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51114686A (en) | 1976-10-08 |
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