JP2004193069A

JP2004193069A - Water cooling cable for high voltage and large current

Info

Publication number: JP2004193069A
Application number: JP2002362743A
Authority: JP
Inventors: Takaaki Isono; 高明礒野; Takashi Kato; 崇加藤; Eisuke Tada; 栄介多田; Takahiro Kataoka; 敬博片岡; Yoshinori Goto; 義則後藤; Masahiro Kita; 昌宏北; Masayuki Konno; 雅行今野; Tadamasa Ara; 忠正荒
Original assignee: Japan Atomic Energy Research Institute; Fuji Electric Holdings Ltd; Showa Electric Wire and Cable Co; Sumitomo Densetsu Co Ltd
Current assignee: Fuji Electric Co Ltd; Japan Atomic Energy Agency; Sumitomo Densetsu Co Ltd; SWCC Corp
Priority date: 2002-12-13
Filing date: 2002-12-13
Publication date: 2004-07-08

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water cooling cable for high voltage and large current that is arranged between a tokamak building and a power supply building of an ITER (International Thermonuclear Experimental Reactor) of compact design and absorbs quake of the tokamak building of quake-absorbing structure, which can also be used for other than ITER. <P>SOLUTION: A soft conductor 3 on which a strand 3a is wound is arranged around a rubber core 2, the outside of which is provided with a rubber hose 4. A terminal for packing liquid inside the rubber hose is fitted to both ends of the soft conductor 3. A pure water flows into the rubber hose 4 through an inlet/exit provided to each terminal, allowing a flow of high voltage and large current while cooled with water. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、高電圧、大電流の送電に用いる常伝導タイプの水冷ケーブルに関する。
【０００２】
【従来の技術】
国際核融合実験炉、所謂ＩＴＥＲは、コスト削減を目指したコンパクト炉の最終設計段階であり、地震が考えられる我が国にＩＴＥＲを誘致する場合、トカマク型の炉を収納する建屋（以下、トカマク建屋と云う）は水平免震構造となる。このため、非免震構造の電源建屋と免震構造のトカマク建屋を渡る電力供給路が必要である。この要求に対し、本出願人等は、ＩＴＥＲ用として使用できるコンパクトな剛体の水冷常伝導導体を開発して別件で特許出願したが、ＩＴＥＲでは、その剛体の導体と併せて、トカマク建屋と電源建屋間で地震発生時にトカマク建屋の揺れを吸収するフレキシブル導体が必要である。
【０００３】
【発明が解決しようとする課題】
ＩＴＥＲは、コスト削減のためのコンパクト設計がなされており、裸導体を充分な絶縁空間距離を保って配置できるだけのスペースを確保し難い。従って、トカマク建屋と電源建屋間で揺れを吸収するフレキシブル導体は、絶縁処理されたケーブルを検討する必要がある。ところが、国内で使用されているケーブルは、低電圧大電流用又は高電圧低電流用であり、ＩＴＥＲで使用するような高電圧大電流用ケーブルは他に類を見ない。
【０００４】
このため、ＩＴＥＲなどに使用できる高電圧、大電流用のコンパクトな絶縁ケーブルを新たに開発する必要性が生じた。
【０００５】
この発明は、その要求に応えることを課題としている。
【０００６】
【課題を解決するための手段】
上記の課題を解決するため、この発明においては、外周に数条の縦溝を設けた屈曲可能なコア又は可撓性に優れる内部ゴムホースと、撚線を前記コア又は内部ゴムホースの外周に巻き添わせて形成される軟導体と、その軟導体の外側に被せる絶縁層兼用のゴムホースと、当該ゴムホースとの間を液封して軟導体の両端部に各々取り付ける端子とを有し、前記端子にゴムホースの内部空間に連通する出入口を設け、その出入口から軟導体を収納したゴムホース内に冷却用の純水を流すようにした高電圧、大電流用水冷ケーブルを提供する。
【０００７】
軟導体の外側に被せるゴムホースの端末外周に保護ホースを装着し、この保護ホースを外側からバンドで締付けてゴムホースに固定することにより、その部分が曲がり難くなり、端末内部の軟導体を保護（断線防止）することができる。
【０００８】
また、軟導体の外側に被せるゴムホースを外側からバンドで締付けて端子に固定し、その端子と軟導体を半田接続等で互いに固定することにより、冷却用純水の液封と電気的接続を確実にすることができる。
【０００９】
上記において高電圧とは、例えば６．６ｋＶを超えるような電圧をいう。
なお、ゴムホースは、電気絶縁性、耐圧性、放射能耐性等に優れるもの、例えば、ＳＢＲ、ＥＰＲ、ＩＩＲ等の合成ゴム中にポリエステル繊維などで形成される非導電性編組補強材を埋めて補強したホースを用いると好ましい。また、このゴムホースや保護ホースの表面にガラスクロス層を複合化して設けるのも好ましい。
【００１０】
このほか、各端子の端部にそれぞれケーブル吊下用のアイボルトを設けておくのも好ましい。
【００１１】
【作用】
この発明の水冷ケーブルは、軟導体をゴムホース内に通す純水で強制冷却するので、高電圧、大電流を流すことができる。
【００１２】
また、ゴムホースが電気絶縁層として働くので、ケーブル間の絶縁空間距離を縮めることができ、限られたスペース内での敷設が可能になる。
【００１３】
【発明の実施の形態】
図１乃至図５に、この発明の水冷ケーブルの実施形態を示す。この水冷ケーブル１は、外周に数条の縦溝を設けたラバーコア２（図３参照）（このラバーコアに代えて可撓性に優れる内部ゴムホースを用いてもよい）と、複数本の撚線３ａをコアと同心の円上に配列し、この撚線３ａをコア２の外周に螺旋状に巻き添わせて形成される軟導体３と、その軟導体３の外側に被せるゴムホース４と、このゴムホースとの間を液封して軟導体３の両端部に各々取り付ける端子５を主たる要素として構成されている。
【００１４】
コア２の外周の縦溝は、撚線３ａの巻きつけ方向と反対方向に捩れていてもよい。
【００１５】
軟導体３は、軟銅撚線を必要本数組み合わせたものを用いている。また、ゴムホース４は、強度に優れるポリエステル繊維で形成される編組補強材４ａをＳＢＲ（スチレン・ブタジエンゴム）中に埋めたものを用いている。補強材用の繊維はポリエステル繊維に限定されない。他の性能の良い合成繊維を用いてもよいが、導電性のあるカーボン繊維などは、ホースの絶縁破壊を招くので使用を避ける。
【００１６】
ホース４を形成するゴムは、ＥＰＲ（エチレン・プロピレンゴム）やＩＩＲ（ブチルゴム）などであってもよい。例示のゴムホース４は、外面にガラスクロス６を加硫接着処理して複合化しており、傷付き難く、摩擦に強いものになっている。
【００１７】
端子５には、電気接続の妨げとならない位置（図示の端子は先端）を選んでゴムホース４の内部空間に通じる純水出入口５ａ（図２、図５参照）を設けている。また、各端子５の先端に、ケーブルの吊下支持に利用するアイボルト７（図２、図４、図５）をそれぞれ取り付けている。
【００１８】
図２、図４、図５の８は、ゴムホース４の端末外周に装着した保護ホースである。例示のケーブルは、保護ホース８（その表面にもガラスクロスを加硫接着して設けている）の外周を数本のバンド９による締付力でゴムホース４に固定する。さらに、ゴムホース４をバンド９による締付力で端子５に固定し、その端子５と軟導体３を半田接続１０等により互いに固定している。
【００１９】
なお、軟導体３とゴムホース４間には適度の隙間があったほうがよい。コア２と軟導体３間の隙間と、軟導体３とゴムホース４間の隙間は純水の通路となり、それ等の隙間を大きくすれば水冷性能がより良くなる。
【００２０】
図１〜図５に示したケーブルについて、１０ＫＡ用、４５ＫＡ用、６８ＫＡ用のものを試作した。その試作ケーブルの仕様を表１に示す。４５ＫＡ用及び６８ＫＡ用のケーブルは、１本ケーブルでは太くなり過ぎるので、複数本を組み合わせて使用する構成にした。
【００２１】
【表１】

【００２２】
これ等の各試作ケーブルについて、ＡＣ３８ＫＶ×１分間と７５ＫＶインパルス電圧印加の耐電圧試験を実施した結果、各ケーブルとも異常は見られなかった。
【００２３】
図６は、この発明の水冷ケーブルのＩＴＥＲでの使用箇所の一例を示す。図中１１はトカマク型核融合実験炉１２を収納する水平免震構造のトカマク建屋、１３は非免震構造の電源建屋である。電源建屋１３内に設置される電源盤１４から建屋の端まで、及びトカマク建屋の端から実験炉１２までの間に剛体の水冷導体１５を敷設し、建屋１１、１３間をトカマク建屋１１の地震等による揺れを吸収するこの発明の水冷ケーブル１で結ぶ構造にしている。
【００２４】
１６は、水冷導体機器取合部、１７は水冷導体直線接続部、１８は水冷導体直角接続部であり、これ等は遮蔽カバー１９で囲われる。２０は水冷導体支持部、２１は接地部、２２は水冷ケーブル１の吊り下げ金具、２３はケーブル１の間隔保持スペーサ、２４はケーブル１の支持碍子である。また、２５は、絶縁ゴムホース２６を介して水冷導体１５の冷媒通路につながれる冷却水出入口である。剛体の水冷導体１５に設けた冷媒通路とフレキシブルな水冷ケーブル１のゴムホース内通路間も絶縁ゴムホース２６でつながれる。
【００２５】
【発明の効果】
以上述べたように、この発明の水冷ケーブルは、屈曲可能なコアの回りに撚線で構成される軟導体を配置し、その外側を絶縁層を兼ねるゴムホースで覆い、軟導体の端部に取り付けた端子に水の出入口を設けてそこからゴムホース内に冷却用の純水を流すようにしたので、ケーブル間の絶縁間隔を縮めて高電圧、大電流を流すことができ、コンパクトに設計されたＩＴＥＲのトカマク建屋と電源建屋間のフレキシブル導体としても問題無く利用できる。
【図面の簡単な説明】
【図１】この発明の水冷ケーブルの一例を示す図
【図２】同上のケーブルの一端側の拡大平面図
【図３】図２のII−II線部の拡大断面図
【図４】図２の端子の側面図
【図５】端子取付部の断面図
【図６】ＩＴＥＲにおける水冷ケーブルの使用の一例を示す図
【符号の説明】
１水冷ケーブル
２ラバーコア
３軟導体
３ａ撚線
４ゴムホース
４ａ編組補強材
５端子
５ａ純水出入口
６ガラスクロス
７アイボルト
８保護ホース
９バンド
１０半田接続[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a normal-type water-cooled cable used for high-voltage, large-current power transmission.
[0002]
[Prior art]
The International Fusion Experimental Reactor, the so-called ITER, is the final design stage of a compact reactor aiming at cost reduction. When attracting ITER to Japan where earthquakes are considered, a building that houses a tokamak type reactor (hereinafter referred to as Tokamak Building) Is a horizontal seismic isolation structure. For this reason, a power supply path that crosses the non-base-isolated power supply building and the base-isolated tokamak building is required. In response to this requirement, the applicants have developed a compact rigid water-cooled normal conducting conductor that can be used for ITER, and filed a patent application in another case. However, ITER has applied the tokamak building and power supply together with the rigid conductor. A flexible conductor that absorbs the shaking of tokamak buildings when an earthquake occurs between buildings is required.
[0003]
[Problems to be solved by the invention]
The ITER has a compact design for cost reduction, and it is difficult to secure a space enough to arrange the bare conductor with a sufficient insulation space distance. Therefore, it is necessary to consider an insulated cable for the flexible conductor that absorbs vibration between the tokamak building and the power supply building. However, the cables used in Japan are for low voltage and high current or high voltage and low current, and there is no other high voltage and high current cable used in ITER.
[0004]
For this reason, there has been a need to newly develop a compact insulated cable for high voltage and large current that can be used for ITER.
[0005]
This invention makes it a subject to respond to the request | requirement.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a bendable core having several longitudinal grooves on the outer periphery or an internal rubber hose excellent in flexibility and a stranded wire are wound around the outer periphery of the core or the inner rubber hose. And a soft hose also serving as an insulating layer that covers the outside of the soft conductor, and a terminal that is sealed between the rubber hose and attached to both ends of the soft conductor. Provided is a high-voltage, large-current water-cooled cable in which an inlet / outlet communicating with an internal space of a rubber hose is provided, and pure water for cooling flows from the inlet / outlet into a rubber hose containing a soft conductor.
[0007]
A protective hose is attached to the outer periphery of the rubber hose that covers the outside of the soft conductor, and this protective hose is fastened with a band from the outside and fixed to the rubber hose, which makes it difficult to bend and protects the soft conductor inside the terminal (disconnected) Prevention).
[0008]
In addition, the rubber hose that covers the outside of the soft conductor is fastened with a band from the outside and fixed to the terminal, and the terminal and the soft conductor are fixed to each other by soldering, etc. Can be.
[0009]
In the above, a high voltage means a voltage exceeding 6.6 kV, for example.
The rubber hose is excellent in electrical insulation, pressure resistance, radiation resistance, etc., for example, a non-conductive braided reinforcement made of polyester fiber in a synthetic rubber such as SBR, EPR, IIR, etc. It is preferable to use a hose. Moreover, it is also preferable to provide a glass cloth layer in combination on the surface of the rubber hose or protective hose.
[0010]
In addition, it is also preferable to provide eyebolts for suspending cables at the end portions of the terminals.
[0011]
[Action]
In the water-cooled cable of the present invention, the soft conductor is forcibly cooled with pure water passing through the rubber hose, so that a high voltage and a large current can flow.
[0012]
Further, since the rubber hose functions as an electrical insulation layer, the insulation space distance between the cables can be shortened, and laying in a limited space becomes possible.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 5 show an embodiment of a water-cooled cable according to the present invention. The water-cooled cable 1 includes a rubber core 2 (see FIG. 3) provided with several longitudinal grooves on the outer periphery (an internal rubber hose excellent in flexibility may be used in place of the rubber core), and a plurality of stranded wires 3a. Are arranged on a circle concentric with the core and the stranded wire 3a is spirally wound around the outer periphery of the core 2, a rubber hose 4 covering the outside of the soft conductor 3, and this rubber hose. Terminals 5 attached to both ends of the soft conductor 3 by liquid sealing between the two are configured as main elements.
[0014]
The longitudinal groove on the outer periphery of the core 2 may be twisted in the direction opposite to the winding direction of the stranded wire 3a.
[0015]
As the soft conductor 3, a combination of necessary numbers of annealed copper stranded wires is used. The rubber hose 4 uses a braided reinforcing material 4a formed of polyester fiber having excellent strength embedded in SBR (styrene-butadiene rubber). The fiber for the reinforcing material is not limited to the polyester fiber. Other good synthetic fibers may be used, but conductive carbon fibers and the like are not used because they cause dielectric breakdown of the hose.
[0016]
The rubber forming the hose 4 may be EPR (ethylene propylene rubber) or IIR (butyl rubber). The rubber hose 4 shown as an example is composited by vulcanizing and bonding a glass cloth 6 on the outer surface, and is hardly scratched and resistant to friction.
[0017]
The terminal 5 is provided with a pure water inlet / outlet 5a (see FIG. 2 and FIG. 5) that selects a position that does not hinder electrical connection (the terminal shown is the tip) and communicates with the internal space of the rubber hose 4. Further, eyebolts 7 (FIGS. 2, 4, and 5) used for supporting the suspension of the cables are attached to the tips of the terminals 5, respectively.
[0018]
Reference numeral 8 in FIGS. 2, 4, and 5 denotes a protective hose attached to the outer periphery of the end of the rubber hose 4. In the illustrated cable, the outer periphery of the protective hose 8 (which is also provided by vulcanizing and bonding a glass cloth on its surface) is fixed to the rubber hose 4 with a tightening force by several bands 9. Further, the rubber hose 4 is fixed to the terminal 5 by the tightening force by the band 9, and the terminal 5 and the soft conductor 3 are fixed to each other by the solder connection 10 or the like.
[0019]
It should be noted that there should be an appropriate gap between the soft conductor 3 and the rubber hose 4. The gap between the core 2 and the soft conductor 3 and the gap between the soft conductor 3 and the rubber hose 4 serve as a passage for pure water. If these gaps are increased, the water cooling performance is improved.
[0020]
The cables shown in FIGS. 1 to 5 were made for 10KA, 45KA, and 68KA. Table 1 shows the specifications of the prototype cable. Since the cables for 45KA and 68KA are too thick with one cable, a configuration in which a plurality of cables are used in combination is used.
[0021]
[Table 1]

[0022]
As a result of conducting a withstand voltage test of AC38 KV × 1 minute and application of 75 KV impulse voltage for each of these prototype cables, no abnormality was found in each cable.
[0023]
FIG. 6 shows an example of the location where the water-cooled cable of the present invention is used in ITER. In the figure, 11 is a tokamak building with a horizontal seismic isolation structure that houses the tokamak type nuclear fusion

experimental reactor

12, and 13 is a power source building with a non-seismic isolation structure. A rigid water-cooled conductor 15 is laid from the power supply panel 14 installed in the power supply building 13 to the end of the building, and from the end of the tokamak building to the experimental furnace 12, and the earthquake between the

buildings

11 and 13 occurs in the tokamak building 11. The water-cooled cable 1 of the present invention that absorbs shaking caused by the above is used.
[0024]
Reference numeral 16 denotes a water-cooled conductor device coupling part, 17 a water-cooled conductor straight line connection part, and 18 a water-cooled conductor right angle connection part, which are surrounded by a shielding cover 19. Reference numeral 20 denotes a water-cooled conductor support portion, 21 denotes a grounding portion, 22 denotes a hanging metal fitting for the water-cooled cable 1, 23 denotes an interval holding spacer for the cable 1, and 24 denotes a support insulator for the cable 1. Reference numeral 25 denotes a cooling water inlet / outlet connected to the refrigerant passage of the water-cooling conductor 15 via the insulating rubber hose 26. An insulating rubber hose 26 also connects the refrigerant passage provided in the rigid water-cooled conductor 15 and the passage in the rubber hose of the flexible water-cooled cable 1.
[0025]
【The invention's effect】
As described above, in the water-cooled cable of the present invention, a soft conductor composed of a stranded wire is arranged around a bendable core, and the outside is covered with a rubber hose that also serves as an insulating layer, and attached to the end of the soft conductor. The terminal was provided with a water inlet and outlet, and pure water for cooling was allowed to flow into the rubber hose from there, so the insulation interval between the cables could be reduced to allow high voltage and large current to flow, and it was designed to be compact. It can also be used as a flexible conductor between the ITER tokamak building and the power building.
[Brief description of the drawings]
1 is a view showing an example of a water-cooled cable according to the present invention. FIG. 2 is an enlarged plan view of one end side of the cable. FIG. 3 is an enlarged cross-sectional view taken along line II-II in FIG. [Fig. 5] Cross-sectional view of the terminal mounting part [Fig. 6] Diagram showing an example of the use of a water-cooled cable in ITER [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water-cooled cable 2 Rubber core 3 Soft conductor 3a Stranded wire 4 Rubber hose 4a Braided reinforcement 5 Terminal 5a Pure water inlet / outlet 6 Glass cloth 7 Eye bolt 8 Protective hose 9 Band 10 Solder connection

Claims

A bendable core having several longitudinal grooves on the outer periphery or an internal rubber hose excellent in flexibility, a soft conductor formed by winding a stranded wire around the outer periphery of the core or the inner rubber hose, and the soft conductor A rubber hose that also serves as an insulating layer covering the outside; and a terminal that is sealed between the rubber hose and attached to both ends of the soft conductor, and is provided with an inlet / outlet that communicates with the internal space of the rubber hose. A high-voltage, high-current water-cooled cable that allows pure water for cooling to flow through a rubber hose containing soft conductors.

Attach a protective hose to the outer periphery of the rubber hose that covers the outside of the soft conductor, tighten the protective hose with a band from the outside and fix it to the rubber hose, and use this protective hose to protect the end of the soft conductor from bending. The cold water cable for high voltage and large current according to claim 1.

The high-voltage, large-current water-cooled cable according to claim 2, wherein a glass cloth layer is provided by vulcanization and adhesion to the surfaces of the rubber hose and the protective hose.

The high-voltage, large-current water-cooled cable according to claim 1, wherein a rubber hose placed outside the soft conductor is fastened with a band from the outside and fixed to the terminal, and the terminal and the soft conductor are fixed to each other by soldering or the like.

The high-voltage, large-current water-cooled cable according to any one of claims 1 to 4, wherein an eyebolt for suspending the cable is provided at each end of each terminal.