JPH1070828A - Terminal structure for cryogenic cable - Google Patents
Terminal structure for cryogenic cableInfo
- Publication number
- JPH1070828A JPH1070828A JP24415696A JP24415696A JPH1070828A JP H1070828 A JPH1070828 A JP H1070828A JP 24415696 A JP24415696 A JP 24415696A JP 24415696 A JP24415696 A JP 24415696A JP H1070828 A JPH1070828 A JP H1070828A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- refrigerant liquid
- layer
- refrigerant
- conductor
- 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.)
- Granted
Links
Landscapes
- Gas Or Oil Filled Cable Accessories (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は電力用送電ケーブル
に用いられる極低温ケーブルの端末構造に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of a cryogenic cable used for an electric power transmission cable.
【0002】[0002]
【従来の技術】図2(イ)は従来の極低温ケーブルの端
末構造の一例の縦断面図、図2(ロ)は問題点の説明図
である。極低温ケーブルの端末はケーブル本体と端末部
との冷却が切分けられている。高圧の液体窒素等の冷媒
液体で冷却されている超電導ケーブルの如き極低温ケー
ブル本体1の導体2は、上記極低温ケーブル本体1の端
部を覆うFRP套管1Aを貫通し、導体引出し棒3と接
続されている。そして、該導体引出し棒3は、真空断熱
層7で囲われた容器内の液体窒素等の冷媒液体層8及び
窒素ガス等の冷媒ガス層9を通り、鉛直方向に延びてフ
ランジ12を貫通して碍子10内部に充填されたSF6
等の流体絶縁層11を経て外部に引出されている。上記
導体引出し棒3は冷媒液体層8の液面付近から流体絶縁
層11の途中まで、エチレンプロピレンゴム等による絶
縁被覆層4が施されており、さらに上記絶縁被覆層4の
両端部付近にはストレスコーン5、6が装着されてい
る。2. Description of the Related Art FIG. 2A is a longitudinal sectional view of an example of a conventional terminal structure of a cryogenic cable, and FIG. 2B is an explanatory view of a problem. In the terminal of the cryogenic cable, the cooling of the cable body and the terminal is separated. A conductor 2 of a cryogenic cable body 1 such as a superconducting cable cooled by a refrigerant liquid such as high-pressure liquid nitrogen penetrates an FRP sleeve 1A covering an end of the cryogenic cable body 1 and a conductor extraction rod 3 Is connected to The conductor extraction rod 3 extends vertically through the refrigerant liquid layer 8 such as liquid nitrogen and the refrigerant gas layer 9 such as nitrogen gas in the container surrounded by the vacuum heat insulating layer 7 and penetrates the flange 12. SF6 filled inside the insulator 10
And the like are drawn out through a fluid insulating layer 11. The conductor drawing rod 3 is provided with an insulating coating layer 4 of ethylene propylene rubber or the like from near the liquid surface of the refrigerant liquid layer 8 to the middle of the fluid insulating layer 11, and further near both ends of the insulating coating layer 4. Stress cones 5 and 6 are mounted.
【0003】[0003]
【発明が解決しようとする課題】上記構造の極低温ケー
ブルの端末においては、冷媒液体層8内に位置する絶縁
被覆層4及びストレスコーン5の下端部が、図2(ロ)
に示すように導体引出し棒1の軸方向と垂直方向に形成
されているので、冷媒液体が侵入熱や導体引出し棒3の
ジュール熱で気化した場合、図2(ロ)のA部及びB部
にその蒸発ガスが溜まる可能性がある。蒸発ガスと液体
との絶縁強度は一般に蒸発ガスの方が小さく、例えば窒
素の場合、液体では45KV/mm、蒸発ガスでは5K
V/mmでその比は9:1である。この蒸発ガスが冷媒
液体層8に停渫することにより、絶縁強度が低下し絶縁
破壊に至る危険性がある。In the terminal of the cryogenic cable having the above-mentioned structure, the lower end portions of the insulating coating layer 4 and the stress cone 5 located in the refrigerant liquid layer 8 are formed as shown in FIG.
As shown in FIG. 2, since the refrigerant liquid is formed in a direction perpendicular to the axial direction of the conductor extraction rod 1, when the refrigerant liquid is vaporized by invasion heat or Joule heat of the conductor extraction rod 3, portions A and B in FIG. There is a possibility that the evaporative gas accumulates. In general, the insulation strength between the evaporative gas and the liquid is smaller in the case of the evaporative gas.
In V / mm, the ratio is 9: 1. When this vaporized gas is suspended in the refrigerant liquid layer 8, there is a danger that insulation strength is reduced and dielectric breakdown is caused.
【0004】[0004]
【課題を解決するための手段】本発明は上述の問題点を
解消し、冷媒液体の気化による蒸発ガスの発生を防止し
た極低温ケーブルの端末構造を提供するもので、その特
徴は、極低温ケーブルの導体を極低温部から常温部に引
出す導体引出し棒に、絶縁被覆層及びストレスコーンを
設けた極低温ケーブルの端末構造において、上記導体引
出し棒を冷却する冷媒液体を、該冷媒液体より沸点の低
いガスで加圧する極低温ケーブルの端末構造にある。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a terminal structure of a cryogenic cable in which the generation of evaporative gas due to the vaporization of refrigerant liquid is provided. In a terminal structure of a cryogenic cable, in which an insulating coating layer and a stress cone are provided on a conductor drawing rod for drawing a cable conductor from a cryogenic part to a room temperature part, a refrigerant liquid for cooling the conductor drawing rod has a boiling point higher than the refrigerant liquid. The terminal structure of a cryogenic cable pressurized with a gas having a low temperature.
【0005】[0005]
【発明の実施の形態】図1は本発明の極低温ケーブルの
端末構造の具体例の縦断面図である。なお、図面におい
て図2(イ)と同一符号は同一部位をあらわしている。
極低温ケーブル本体1の導体2は上記極低温ケーブル本
体1の端部を覆うFRP套管1Aを貫通して導体引出し
棒3と接続されている。該導体引出し棒3は真空断熱層
7で囲われた容器内の冷媒液体層8及び冷媒ガス層9を
通り、鉛直方向に延びてフランジ12を貫通して碍子1
0内部に充填されたSF6等の流体絶縁層11を経て外
部に引出されている。上記導体引出し棒3は冷媒液体層
8の液面付近から流体絶縁層11の途中まで絶縁被覆層
4が施されており、さらに上記絶縁被覆層4の両端部付
近にはストレスコーン5、6が装着されている。FIG. 1 is a longitudinal sectional view of a specific example of a terminal structure of a cryogenic cable according to the present invention. In the drawings, the same reference numerals as those in FIG. 2A denote the same parts.
The conductor 2 of the cryogenic cable main body 1 penetrates the FRP sleeve 1A that covers the end of the cryogenic cable main body 1, and is connected to the conductor drawing rod 3. The conductor extraction rod 3 extends vertically through the refrigerant liquid layer 8 and the refrigerant gas layer 9 in the container surrounded by the vacuum insulation layer 7, penetrates through the flange 12, and
0 is drawn out through a fluid insulating layer 11 such as SF6 filled inside. The conductor withdrawal rod 3 is provided with an insulating coating layer 4 from near the liquid surface of the refrigerant liquid layer 8 to the middle of the fluid insulating layer 11, and stress cones 5 and 6 are provided near both ends of the insulating coating layer 4. It is installed.
【0006】本発明の端末構造においては、上記冷媒ガ
ス層9にガス加圧装置13が接続されており、該加圧装
置13を通じてガスを供給して冷媒液体層8を加圧す
る。加圧するのに使用するガスとしては液体窒素より沸
点の低い、例えばヘリウム、水素、ネオン等が用いられ
る。このようにガスにて液体窒素等を加圧することによ
り、例えば液体窒素の圧力が2気圧になれば、沸点は大
気圧の約77Kから約84Kに上昇する。従って液体窒
素の温度が84Kに達するまでは蒸発が起らず、ガスの
発生がなくなる。In the terminal structure of the present invention, a gas pressurizing device 13 is connected to the refrigerant gas layer 9, and gas is supplied through the pressurizing device 13 to pressurize the refrigerant liquid layer 8. As a gas used for pressurization, helium, hydrogen, neon, or the like having a lower boiling point than liquid nitrogen is used. By pressurizing liquid nitrogen or the like with a gas as described above, for example, when the pressure of liquid nitrogen becomes 2 atm, the boiling point increases from the atmospheric pressure of about 77K to about 84K. Therefore, no evaporation occurs until the temperature of the liquid nitrogen reaches 84 K, and no gas is generated.
【0007】又侵入熱やジュール熱が長時間発生する場
合は、液体窒素等の冷媒液体の温度は徐々に上昇し、い
ずれはその圧力での沸点に達する。従って、図1に示す
ように冷媒液体層8に熱交換部15を介して冷凍機14
を取付け、熱交換部15を通じて冷媒液体層8を冷却
し、その冷凍機14の能力を侵入熱やジュール熱と同等
にすれば、冷媒液体層8の温度上昇は起らず、気化によ
る蒸発ガスはなくなる。[0007] When the intrusion heat or Joule heat is generated for a long time, the temperature of the refrigerant liquid such as liquid nitrogen gradually rises, and eventually reaches the boiling point at that pressure. Therefore, as shown in FIG.
If the refrigerant liquid layer 8 is cooled through the heat exchange section 15 and the capacity of the refrigerator 14 is made equal to the intrusion heat or Joule heat, the temperature of the refrigerant liquid layer 8 does not rise, and the evaporative gas Is gone.
【0008】[0008]
【発明の効果】以上説明したように、本発明の極低温ケ
ーブルの端末構造によれば、冷媒液体の気化による蒸発
ガスの発生はなく、これによる絶縁性能の低下もなくな
って信頼性の高い端末部が得られる。As described above, according to the terminal structure of the cryogenic cable of the present invention, there is no generation of evaporative gas due to the vaporization of the refrigerant liquid, and there is no decrease in insulation performance due to this. Part is obtained.
【図1】本発明の極低温ケーブルの端末構造の具体例の
縦断面図である。FIG. 1 is a longitudinal sectional view of a specific example of a terminal structure of a cryogenic cable according to the present invention.
【図2】図2(イ)は従来の極低温ケーブルの端末構造
の一例の縦断面図、図2(ロ)は問題点の説明図であ
る。FIG. 2A is a longitudinal sectional view of an example of a conventional cryogenic cable terminal structure, and FIG. 2B is an explanatory diagram of a problem.
1 極低温ケーブル本体 2 ケーブル導体 3 導体引出し棒 4 絶縁被覆層 5、6 ストレスコーン 7 真空遮断層 8 冷媒液体層 9 冷媒ガス層 10 碍子 11 流体絶縁層 12 フランジ 13 ガス加圧装置 14 冷凍機 15 熱交換部 DESCRIPTION OF SYMBOLS 1 Cryogenic cable main body 2 Cable conductor 3 Conductor lead-out rod 4 Insulation coating layer 5, 6 Stress cone 7 Vacuum barrier layer 8 Refrigerant liquid layer 9 Refrigerant gas layer 10 Insulator 11 Fluid insulation layer 12 Flange 13 Gas pressurizer 14 Refrigerator 15 Heat exchange section
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長屋 重夫 愛知県名古屋市緑区大高町字北関山20番地 の1 中部電力株式会社内 (72)発明者 下之園 隆明 愛知県名古屋市緑区大高町字北関山20番地 の1 中部電力株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeo Nagaya 20-1 Kitakanyama, Odaka-cho, Midori-ku, Nagoya-shi, Aichi Prefecture Inside Chubu Electric Power Co., Inc. (72) Inventor Takaaki Shimonosono Midori-ku, Nagoya-shi, Aichi Otakamachi character Kita-Kanzan 20 No. 1 Chubu Electric Power Co., Inc.
Claims (1)
温部に引出す導体引出し棒に、絶縁被覆層及びストレス
コーンを設けた極低温ケーブルの端末構造において、上
記導体引出し棒を冷却する冷媒液体を該冷媒液体より沸
点の低いガスで加圧することを特徴とする極低温ケーブ
ルの端末構造。1. A refrigerant liquid for cooling a conductor of a cryogenic cable in a terminal structure of the cryogenic cable, wherein an insulating coating layer and a stress cone are provided on a conductor drawing rod for drawing a conductor of the cryogenic cable from a cryogenic part to a room temperature part. Cryogenic cable is pressurized with a gas having a lower boiling point than the refrigerant liquid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24415696A JP3181513B2 (en) | 1996-08-26 | 1996-08-26 | Terminal structure of cryogenic cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24415696A JP3181513B2 (en) | 1996-08-26 | 1996-08-26 | Terminal structure of cryogenic cable |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1070828A true JPH1070828A (en) | 1998-03-10 |
JP3181513B2 JP3181513B2 (en) | 2001-07-03 |
Family
ID=17114603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24415696A Expired - Fee Related JP3181513B2 (en) | 1996-08-26 | 1996-08-26 | Terminal structure of cryogenic cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3181513B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006087761A1 (en) * | 2005-02-15 | 2006-08-24 | Sumitomo Electric Industries, Ltd. | End structure of superconducting cable |
WO2011004955A1 (en) * | 2009-07-10 | 2011-01-13 | Ls Cable Ltd. | Termination structure for superconducting cable |
WO2011152344A1 (en) * | 2010-05-31 | 2011-12-08 | 古河電気工業株式会社 | Terminal connecting section for very-low temperature cable |
JP2012217334A (en) * | 2011-03-31 | 2012-11-08 | Furukawa Electric Co Ltd:The | Terminal connection part for cryogenic cable |
-
1996
- 1996-08-26 JP JP24415696A patent/JP3181513B2/en not_active Expired - Fee Related
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006087761A1 (en) * | 2005-02-15 | 2006-08-24 | Sumitomo Electric Industries, Ltd. | End structure of superconducting cable |
EP1850436A1 (en) * | 2005-02-15 | 2007-10-31 | Sumitomo Electric Industries, Ltd. | End structure of superconducting cable |
US7729731B2 (en) * | 2005-02-15 | 2010-06-01 | Sumitomo Electric Industries, Ltd. | Terminal structure of superconducting cable |
EP1850436A4 (en) * | 2005-02-15 | 2011-04-13 | Sumitomo Electric Industries | End structure of superconducting cable |
WO2011004955A1 (en) * | 2009-07-10 | 2011-01-13 | Ls Cable Ltd. | Termination structure for superconducting cable |
US8912446B2 (en) | 2009-07-10 | 2014-12-16 | Ls Cable Ltd. | Termination structure for superconducting cable |
WO2011152344A1 (en) * | 2010-05-31 | 2011-12-08 | 古河電気工業株式会社 | Terminal connecting section for very-low temperature cable |
JP5089822B2 (en) * | 2010-05-31 | 2012-12-05 | 古河電気工業株式会社 | Termination connection for cryogenic cable |
CN102884693A (en) * | 2010-05-31 | 2013-01-16 | 古河电气工业株式会社 | Terminal connecting section for very-low temperature cable |
JP2012217334A (en) * | 2011-03-31 | 2012-11-08 | Furukawa Electric Co Ltd:The | Terminal connection part for cryogenic cable |
Also Published As
Publication number | Publication date |
---|---|
JP3181513B2 (en) | 2001-07-03 |
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