JP4276321B2

JP4276321B2 - Cable connection

Info

Publication number: JP4276321B2
Application number: JP02316299A
Authority: JP
Inventors: 信幸瀬間; 恒民木原; 義則坂口; 信彦堀田
Original assignee: SWCC Showa Cable Systems Co Ltd
Current assignee: SWCC Corp
Priority date: 1998-12-24
Filing date: 1999-01-29
Publication date: 2009-06-10
Anticipated expiration: 2019-01-29
Also published as: JP2000245050A

Description

【０００１】
【発明の属する技術分野】
本発明は、ケーブルの接続部に関するものであり、特に、絶縁体で被覆された架空送電ケーブルをコンクリート柱（電柱）などの支持物上にて接続するためのケーブル接続部に関するものである。
【０００２】
【従来の技術】
近年、電気設備技術基準の変更により都市部において７７ＫＶケーブルによる架空送電が可能となった。
【０００３】
架空ケーブルの布設は、例えばコンクリート柱間に延線されたメッセンジャワイヤに架空ケーブルをラッシングして取り付けるなどの様々な方法にて行われているが、架空ケーブルは、コンクリート柱上にて接続することが必要となる。従来、架空ケーブルの接続は、直線接続部にて行われており、直線接続部の一例を図１０に示す。
【０００４】
つまり、本例にて、直線接続部１Ａは、内部にスリーブ状の内部導体２を一体に成形した、通常エポキシ樹脂などの絶縁材料で作製されたブッシングモールド３を有する。
【０００５】
ＣＶケーブルのような架空ケーブル４Ａ、４Ｂの通電接続部、即ち、ケーブル接続材料（オス側）１００Ａ、１００Ｂは、直線接続部１Ａの軸線方向に対向して配置された接続受容孔に両側より装着される。各ケーブルの接続材料１００Ａ、１００Ｂは、当業者には周知のプレハブ構造とされ、ケーブルの先端部に形成された接続端子（プラグ１０、１１、マルチラムバンド１３及び引留め装置１４など）、ストレスコーン４４、押し金具４３、圧縮装置４２、ケーブル保護金具４１などの接続部品により構成され、スリーブ状内部導体２に接続される。直線接続部１Ａの外周には外ケース１５が配置されている。
【０００６】
上記構成の直線接続部１Ａは、図１１に示すように、コンクリート柱などの支持物Ｓに概略水平状態にて取り付けられる。三相ケーブルの場合には、直線接続部１Ａは、３個並置して設けられる。
【０００７】
【発明が解決しようとする課題】
しかしながら、従来の直線接続部１Ａを使用してＣＶケーブル４Ａ、４Ｂを接続する場合には、コンクリート柱上に配置されている諸々の取付け装置との関係から、メッセンジャーワイヤに沿って延線されているケーブルを直線接続部１Ａへと導入するためには、図１１に一点鎖線にて示すように、各ケーブルは、直線接続部近傍にて円弧部Ｒ₁、Ｒ₂が二つ形成される、所謂、二次円弧状に湾曲させて各ケーブルの接続材料１００Ａ、１００Ｂを直線接続部１Ａの接続受容孔へと装着することが必要とされる。直線接続部１Ａへの接続のためにＣＶケーブル４Ａ、４Ｂを二次円弧状に曲げるには、水平及び垂直方向の作業領域Ｌ₁、Ｌ₂が大となり、接続部全体が大型化する。又、垂直方向の作業領域Ｌ₂が大となることは、地上高さの制約から電柱をも長くする必要が生じてくる。しかも、直線接続部１Ａに対するケーブル４Ａ、４Ｂの接続作業も困難となり、作業効率が悪いという問題をも有していた。
【０００８】
従って、本発明の目的は、接続部全体の小型化を図ることができ、電柱を長くする必要もなく、ケーブルの接続作業をも容易なものとし、作業効率を著しく向上させることのできるケーブル接続部を提供することである。
【０００９】
【課題を解決するための手段】
上記目的は本発明に係るケーブル接続部にて達成される。要約すれば、本発明は、内部導体と、この内部導体の周りに絶縁材料にて一体に成形されたブッシングとを備え、前記内部導体の接続孔と前記ブッシングの受容孔とにて形成される二つの接続受容孔にそれぞれ架空ケーブルの接続材料が装着される、支持物上に取付けて使用するためのケーブル接続部において、
前記各接続受容孔が上方向に開口して形成され、且つ、前記二つの接続受容孔は、上方向にＶ字状に拡開して形成され、前記各架空ケーブルの接続材料を上方より装着可能とし、
前記架空ケーブルの接続材料における端末処理されたケーブルの先端導体部に固着されたプラグと、前記端末処理されたケーブルの絶縁体端面との間に、前記ケーブルのケーブル接続部からの引き抜けを防止するための引留め装置を設け、
前記プラグは、前記先端導体部に固着された内プラグと、前記内プラグに装着され、前記内部導体の接続孔に電気的に接触する外プラグとにて形成され、
前記引留め装置は、
（ａ）前記内プラグと前記ケーブル絶縁体端面との間に配置された概略円筒状の内側引留め具と、前記内側引留め具の先端に取り付けられた外側引留め具と、前記内側引留め具と前記外側引留め具とにて形成される環状空間部に配置された中間引留め具と、を有し、
（ｂ）前記内側引留め具は、前記先端導体部外周部に取付けられ、前記外側引留め具を取付けた前記先端とは反対側に、外周に突出して止めフランジが形成されており、
（ｃ）前記外側引留め具は、前記内側引留め具に取付ける取付け部と、前記取付け部に一体に形成され、前記内側引留め具と概略同心的に延在する円筒状部とを有し、前記円筒状部には複数個の係止孔が形成され、係止ボールが移動自在に配置されており、
（ｄ）前記外側引留め具の下方端面は、前記ケーブルを前記ケーブル接続部に接続した際に、前記内部導体の前記接続孔に形成された小径部と大径部との肩部に当接し、外周面が前記接続孔の大径部に嵌合し、
（ｅ）前記中間引留め具は、前記係止ボールに係合し、前記係止ボールを前記係止孔内へと案内するガイド部と、前記ガイド部に一体に形成され、前記ケーブル絶縁体の外径より大きな内径とされるばね受け部とを有し、前記ばね受け部の上方に前記ばね受け部と対向して前記ケーブルの外周部に押しリングが配置され、
（ｆ）前記ガイド部と前記外側引留め具の取付け部との間、及び、前記ばね受け部と前記押しリングとの間に、それぞれ圧縮コイルばねが配置され、前記ガイド部と前記外側引留め具の取付け部との間に配置した前記圧縮コイルばねは、前記ばね受け部と前記押しリングとの間に配置した圧縮コイルばねより弱いばね力とされる、
ことを特徴とするケーブル接続部である。
【００１１】
本発明の一実施態様によると、前記架空ケーブルの接続材料が装着される前記二つの接続受容孔の間に位置して、前記接続受容孔とは反対側に下方向に延在して他の接続受容孔を形成し、この接続受容孔に検電器が装着可能とされる。
【００１２】
本発明の他の実施態様によると、前記ケーブル接続部を３個並置し、３相架空ケーブル接続用として使用する。
【００１３】
【発明の実施の形態】
以下、本発明に係るケーブル接続部を図面に則して更に詳しく説明する。
【００１４】
実施例１
図１に本発明のケーブル接続部１の一実施例を示す。本実施例にて、接続部１はＵ形接続部として説明するがこれに限定されるものではない。
【００１５】
本実施例にて、Ｕ形接続部１は、内部導体（埋込電極）２を備え、この内部導体２の周りにはエポキシ樹脂などの絶縁材料にて形成される絶縁体のブッシング３が一体に成形されている。
【００１６】
Ｕ形接続部１には、接続される架空ケーブル４Ａ、４Ｂのそれぞれの接続材料（接続先端部）１００Ａ、１００Ｂが装着可能な接続受容孔が上方に開口して形成される．
つまり、本実施例ではＵ形接続部１には、互いに平行に二つの接続受容孔が形成され、図１にて、Ｕ形接続部１の左側の接続受容孔には一方側の架空ケーブル４Ａの接続材料（接続先端部）１００Ａが装着可能とされ、又右側の接続受容孔には他方側の架空ケーブル４Ｂの接続材料（接続先端部）１００Ｂが装着可能とされる。
【００１７】
各接続受容孔は、内部導体２に形成された接続孔２０と、該接続孔２０と連通してブッシング３に形成された上方に開口を有する受容孔３０とにて形成される。内部導体２の接続孔２０は、図２に示すように、小径部２０Ａと大径部２０Ｂとを有する。
【００１８】
Ｕ形接続部１に接続されるケーブル接続材料１００Ａ、１００Ｂの構成をその一実施例について説明する。本実施例によると、ケーブル接続材料１００Ａ、１００Ｂは同様の構造とされるので、ケーブル４Ａの接続材料１００Ａについてのみ説明する。
【００１９】
図２を参照すると、端末処理され露出されたケーブル４Ａの先端導体部４０には、内部導体２と電気的接触を行うためのプラグが装着される。プラグは、先端導体部４０の先端からほぼ半分の領域において導体部４０に嵌着される、外周上にスリットが形成された傾斜円筒状の内プラグ１０と、この内プラグ１０に装着される外プラグ１１とを有する。外プラグ１１は、内プラグ１０の外周と相補形状の傾斜内面を有し、内プラグ１０に嵌合してくさび作用をなし、内プラグ１０を先端導体部４０に圧縮固着させる。外プラグ１１の外周面には、環状の溝１２が形成され、そこに、多数のリボン状の板ばね集合体を環状に配置して構成されるマルチラムバンドのような接触子１３が配置されている。ケーブル４ＡをＵ形接続部１に接続した際に、このマルチラムバンド１３が内部導体２の接続孔２０の小径部２０Ａに適合され、電気的接触をなす。
【００２０】
本実施例によると、先端導体部４０にて、上記先端導体部４０に固着された内プラグ１０と、ケーブル絶縁体端面４６との間に、ケーブル４Ａの接続部１からの引き抜けを防止するための引留め装置５０が配置される。
【００２１】
引留め装置５０は、図３をも参照するとよりよく理解されるように、内プラグ１０とケーブル絶縁体端面４６との間に配置された概略円筒状の内側引留め具５１と、この内側引留め具５１の先端、即ち、内プラグ１０側に形成された螺子部５２に螺合して取り付けられた外側引留め具５３とを有する。内側引留め具５１は、Ｏリング５４を介して導体部外周部に取付けられ、又、螺子部５２と反対側には外周に突出して止めフランジ５５が形成されている。Ｏリング５４は、内側引留め具５１が、導体部４０に対して同一軸線にて導体部外周部に自動調心にて位置決めする作用をなす。
【００２２】
又、外側引留め具５３は、内側引留め具５１に螺合する取付け部５６と、この取付け部５６に一体に形成され、前記内側引留め具５１と概略同心的に延在する円筒状部５７とを有する。円筒状部５７には等間隔にて複数個、例えば４〜８個の係止孔５８が形成され、係止ボール５９が移動自在に配置される。又、外側引留め具５３の下方端面６０は、ケーブル４ＡをＵ形接続部１に接続した際に、内部導体２の接続孔２０の小径部２０Ａ及び大径部２０Ｂとの肩部２１（図２）に当接し、外周面が内部導体２の接続孔２０の大径部２０Ｂに嵌合する。
【００２３】
引留め装置５０は、更に、中間引留め具６１を備えている。中間引留め具６１は、上記内側引留め具５１と外側引留め具５３とにて形成される環状空間部６２に位置して係止ボール５９に係合し、係止ボール５９を係止孔５８内へと案内するガイド部６３と、このガイド部６３に一体に形成され、ケーブル絶縁体４７の外径より大きな内径とされるばね受け部６４とを有する。ばね受け部６４の上方にばね受け部６４と対向してケーブル外周部に押しリング６５が配置される。又、ガイド部６３と外側引留め具５３の取付け部５６との間、及び、ばね受け部６４と押しリング６５との間に、それぞれ圧縮コイルばね６６、６７が配置される。圧縮コイルばね６６は、圧縮コイルばね６７より弱いばね力とされる。この点については、後で更に説明する。
次に、上記構成とされる本発明のＵ形接続部１に対するケーブル接続材料１００Ａの着脱手順について説明する。
【００２４】
先ず、ケーブル接続材料１００Ａが、図４に示すように、組み立てられる。つまり、Ｕ形接続部１に接続されるケーブル４Ａは、保護金具４１、圧縮装置４２、押し金具４３、ストレスコーン４４などを端末処理されたケーブル端末部に引き通し、その後、導体部４０に引留め装置５０が装着される。このとき、引留め装置５０の中間引留め具６１は、ばね６６、６７により付勢され、ガイド部６３が内側引留め具５１の止めフランジ５５に当接している。従って、係止ボール５９は、係止孔５８より半径方向内方へと移動自在とされ、内方へと落下するボール５９は圧縮コイルばね６６にて担時される。次いで、先端導体部４０に接続プラグ、即ち、内プラグ１０及び、マルチラムバンド１３を備えた外プラグ１１が、上述したようにして固着される。
【００２５】
次いで、図５に示すように、ケーブル４Ａの接続材料（接続先端部）１００Ａを接続受容孔に挿入すると、マルチラムバンド１３を備えた外プラグ１１が内部導体２の接続孔２０の小径部２０Ａに適合され、電気的接触をなす。引留め装置５０の外側引留め具５３は、内部導体２の接続孔２０の大径部２０Ｂに適合して挿入される。更に、ストレスコーン４４を受容孔３０へと押入すると、ストレスコーン４４の端面４４Ａが押しリング６５に当接し、この押しリング６５を内部導体２側へと押圧する。
【００２６】
このとき、上述のように、圧縮コイルばね６７の方が圧縮コイルばね６６よりばね力が大とされるので、圧縮コイルばね６７により圧縮コイルばね６６はより多く圧縮され、従って、中間引留め具６１は、圧縮コイルばね６６のばね力に抗して内方へとプラグ側に移動する。
【００２７】
これにより、係止ボール５９は、ガイド部６３により係止孔５８内を半径方向外方向へと移動され、係止ボール５９を、内部導体２の大径部２０Ｂに形成された環状凹溝２２内に押入させる。従って、ケーブル４Ａは、Ｕ形接続部１にロックされた状態となり、Ｕ形接続部１からの引き抜きが防止される。この状態にて、ケーブル４ＡをＵ形接続部１から引き出す方向に力を加えることにより、ケーブル４ＡがＵ形接続部１に確実にロックされたか否かを確認することができる。つまり、上述のように、圧縮コイルばね６７の方が圧縮コイルばね６６よりばね力が大とされるので、ケーブル４ＡをＵ形接続部１から引き出す方向に力を加えても、圧縮コイルばね６６は圧縮コイルばね６７により圧縮されており、係止ボール５９は、ガイド部６３により係止孔５８内を半径方向外方向へと移動された状態を保持する。
【００２８】
ケーブル４ＡがＵ形接続部１に確実にロックされたことを確認した後、更に、ストレスコーン４４は、押圧金具４３、圧縮金具４２により接続部側へと押圧され、保護金具４１がブッシング３の端面に固定される。更に、図２に示すように、防水カバー４８が接続部１の金属ケース４９にボルトなどにて固定される。
【００２９】
Ｕ形接続部１に接続されたケーブルを接続部から除去する場合には、上記接続したときの作業手順を逆に実施することとなる。
【００３０】
つまり、先ず、防水カバー４８を除去し、保護金具４１、圧縮装置４２、押し金具４３を所定位置までずらす。
【００３１】
次いで、ストレスコーン４４をブッシングの受容孔３０から引き抜き、後退させる。押しリング６５及び中間引留め具６１は、コイルばね６６、６７により後退するストレスコーン４４と共に移動され、内部導体２の環状凹溝２２内に押入されていた係止ボール５９との係止状態が解放される。これにより、ケーブル４ＡのＵ形接続部１に対するロックが解除され、ケーブル４ＡのＵ形接続部１からの引き抜きが可能となる。
【００３２】
このように、本実施例によれば、ケーブル分離時のストレスコーン４４の移動は、内部導体２の環状凹溝２２内に陥入していた係止ボール５９と、中間引留め具５１のガイド部６３との係止状態が解放される程度でよい。
【００３３】
ケーブル接続材料１００Ｂに関しても、上述したように、ケーブル接続材料１００Ａと同様に構成され、又、同様に作用する。
【００３４】
以上のように構成される本発明のＵ形接続部１によれば、図６に示すように、ケーブルの接続材料１００Ａ、１００Ｂは、Ｕ形接続部１に対して上方から装着可能とされる。
【００３５】
つまり、メッセンジャーワイヤに沿って延線されているケーブル４Ａ、４Ｂは、図６に一点鎖線にて示すように、実質的に一つの円弧部Ｒ₁にて湾曲され、その後、各ケーブルの接続材料１００Ａ、１００Ｂは、ＣＶケーブル４Ａ、４Ｂを一つの円弧部Ｒを形成した一次円弧状に湾曲させた状態にてＵ形接続部１の接続受容孔へと装着される。従って、ケーブル４Ａ、４Ｂの曲げに必要な水平及び垂直方向長さＬ₁、Ｌ₂は、従来の直線接続部１Ａにケーブルを接続する場合の長さＬ₁、Ｌ₂に比較すると大幅に短縮することができる。このことは、作業領域範囲を作業に好適な長さに設定することができ、作業効率の向上を図ることができるという利点がある。
【００３６】
上記本発明のＵ形接続部１を三相用架空ケーブルの接続に使用した場合には、図７に示すように、各相（Ｒ、Ｓ、Ｔ）の入力及び出力ケーブル４Ａ、４ＢごとにＵ形接続部１が必要となり、そのために三個のＵ形接続部が並置して使用される。所望により、三個のＵ形接続部を一体的に成形することも可能である。
【００３７】
実施例２
実施例１では、ケーブル接続部１は、垂直に且つ互いに平行に二つの接続受容孔が形成されたＵ形接続部であるとして説明したが、図８に示すように、ケーブル接続部１は、二つの接続受容孔が角度αでＶ字状に上方へと拡開した、即ち、Ｖ形接続部とすることも可能である。Ｖ字状の拡開角度αは、通常、９０°程度とされる。
【００３８】
本実施例のＶ形接続部も実施例１のＵ形接続部と同様に構成されるので、詳しい説明は省略する。
【００３９】
本実施例においては、実施例１と同様に、各ケーブルの接続材料１００Ａ、１００Ｂは、ＣＶケーブル４Ａ、４Ｂを一つの円弧部Ｒを形成した一次円弧状に湾曲させてＶ形接続部１の接続受容孔へと装着することができる．
従って、本実施例においても、ケーブル４Ａ、４Ｂの曲げに必要な水平及び垂直方向長さＬ₁、Ｌ₂は、従来の直線接続部１Ａにケーブルを接続する場合の長さに比較すると大幅に短縮することができる。このことは、作業領域範囲を作業に好適な長さに設定することができ、作業効率の向上を図ることができるという利点がある。
【００４０】
実施例３
図９に本発明のケーブル接続部１の他の実施例を示す。本実施例にて、接続部１はＹ形分岐接続部とされる。
【００４１】
本実施例にて、Ｙ形分岐接続部１は、概略Ｙ形形状とされる内部導体（埋込電極）２を備え、この内部導体２の周りにはエポキシ樹脂などとされるとされる絶縁体のＹ形ブッシング３が一体に成形されている。
【００４２】
Ｙ形分岐接続部１の一方側には、一方の架空ケーブル４Ａの接続材料（接続先端部）１００Ａが装着可能とされ、又他方側には、他方の架空ケーブル４Ｂの材料（接続先端部）１００Ｂが装着可能とされる。この構成は、実施例１のＵ形接続部と同じ構成であり、これ以上の説明は省略する。
【００４３】
本実施例のＹ形接続部１においては、架空ケーブル４Ａの接続材料１００Ａが装着される接続受容孔と、架空ケーブル４Ｂの接続材料１００Ｂが装着される接続受容孔との間に、検電器２００を装着するための第３の接続受容孔が形成される点において相違している。保守時に送配電系統における課電の有無を外部から検知できる検電器２００の構成については当業者には周知であるので、これ以上の詳しい説明は省略する。
【００４４】
検電器２００のための第３の接続受容孔は、架空ケーブル４Ａ及び架空ケーブル４Ｂのための接続受容孔とは反対方向に下方へと延在し開口している。この第３の接続受容孔も又、上記内部導体２に形成された接続孔２０と、該接続孔２０と連通してブッシング３に形成された受容孔３０とにて形成される。内部導体２の接続孔２０は、図９に示すように、小径部２０Ａと大径部２０Ｂとを有する。この接続受容孔は、図９に示すように、検電器２００が装着され、円筒状カバー２０１にて被覆される。
【００４５】
勿論、本実施例にて説明した検電器２００のための第３の接続受容孔は、実施例２のＶ形接続部にも同様に設けることができる。
【００４６】
【発明の効果】
以上説明したように、本発明のケーブル接続部は、内部導体と、この内部導体の周りに絶縁材料にて一体に成形されたブッシングとを備え、内部導体の接続孔とブッシングの受容孔とにて形成される二つの接続受容孔にそれぞれ架空ケーブルの接続材料が装着される、支持物上に取付けて使用するためのケーブル接続部において、各接続受容孔が上方向に開口して形成され、且つ、二つの接続受容孔は、上方向にＶ字状に拡開して形成され、各架空ケーブルの接続材料を上方より装着可能とし、架空ケーブルの接続材料における端末処理されたケーブルの先端導体部に固着されたプラグと、端末処理されたケーブルの絶縁体端面との間に、前記ケーブルのケーブル接続部からの引き抜けを防止するための引留め装置を設け、
前記プラグは、記先端導体部に固着された内プラグと、前記内プラグに装着され、前記内部導体の接続孔に電気的に接触する外プラグとにて形成され、
前記引留め装置は、
（ａ）前記内プラグと前記ケーブル絶縁体端面との間に配置された概略円筒状の内側引留め具と、前記内側引留め具の先端に取り付けられた外側引留め具と、前記内側引留め具と前記外側引留め具とにて形成される環状空間部に配置された中間引留め具と、を有し、
（ｂ）前記内側引留め具は、前記先端導体部外周部に取付けられ、前記外側引留め具を取付けた前記先端とは反対側に、外周に突出して止めフランジが形成されており、
（ｃ）前記外側引留め具は、前記内側引留め具に取付ける取付け部と、前記取付け部に一体に形成され、前記内側引留め具と概略同心的に延在する円筒状部とを有し、前記円筒状部には複数個の係止孔が形成され、係止ボールが移動自在に配置されており、
（ｄ）前記外側引留め具の下方端面は、前記ケーブルを前記ケーブル接続部に接続した際に、前記内部導体の前記接続孔に形成された小径部と大径部との肩部に当接し、外周面が前記接続孔の大径部に嵌合し、
（ｅ）前記中間引留め具は、前記係止ボールに係合し、前記係止ボールを前記係止孔内へと案内するガイド部と、前記ガイド部に一体に形成され、前記ケーブル絶縁体の外径より大きな内径とされるばね受け部とを有し、前記ばね受け部の上方に前記ばね受け部と対向して前記ケーブルの外周部に押しリングが配置され、
（ｆ）前記ガイド部と前記外側引留め具の取付け部との間、及び、前記ばね受け部と前記押しリングとの間に、それぞれ圧縮コイルばねが配置され、前記ガイド部と前記外側引留め具の取付け部との間に配置した前記圧縮コイルばねは、前記ばね受け部と前記押しリングとの間に配置した圧縮コイルばねより弱いばね力とされる、構成とされるので、接続部全体の小型化を図ることができ、電柱を長くする必要もなく、ケーブルの接続作業をも容易なものとし、作業効率を著しく向上させることができる。また、接続受容孔部をＶ字状に拡開して形成してもケーブルの引き抜きを防止することができる。
【図面の簡単な説明】
【図１】本発明に係るケーブル接続部の一実施例を示す断面図である。
【図２】図１のケーブル接続部の部分拡大図である。
【図３】引留め装置の構成を説明する断面図である。
【図４】ケーブル接続材料の組み立て手順を説明するための図である。
【図５】ケーブル接続材料の組み立て手順を説明するための図である。
【図６】本発明に係るケーブル接続部を使用したケーブルの接続態様を説明する図である。
【図７】本発明に係るケーブル接続部を使用して３相架空ケーブルを接続するためのケーブル接続部の斜視図である。
【図８】本発明に係るケーブル接続部の他の実施例を示す断面図である。
【図９】本発明に係るケーブル接続部の他の実施例を示す断面図である。
【図１０】従来のケーブル直線接続部の断面図である。
【図１１】従来のケーブル直線接続部を使用したケーブルの接続態様を説明する図である。
【符号の説明】
１ケーブル接続部
２内部導体（埋込電極）
３ブッシング
４Ａ、４Ｂケーブル
１０内プラグ
１１外プラグ
１３接触子（マルチラムバンド）
２０接続孔
３０受容孔
４０先端導体部
４１保護金具
４２圧縮装置
４３押し金具
４４ストレスコーン
５０引留め装置
１００Ａ、Ｂケーブル接続材料
２００検電器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable connecting portion, and more particularly to a cable connecting portion for connecting an overhead power transmission cable covered with an insulator on a support such as a concrete pole (electric pole).
[0002]
[Prior art]
In recent years, changes in electrical equipment technical standards have enabled over-the-counter power transmission using 77 KV cables in urban areas.
[0003]
Installation of aerial cables is carried out by various methods such as lashing and attaching aerial cables to messenger wires that are extended between concrete columns. Is required. Conventionally, the connection of the aerial cable is performed at the straight connection portion, and an example of the straight connection portion is shown in FIG.
[0004]
That is, in this example, the straight connection portion 1A has a bushing mold 3 made of an insulating material such as an epoxy resin, in which a sleeve-like inner conductor 2 is integrally formed.
[0005]
Current connection portions of overhead cables 4A and 4B such as CV cables, that is, cable connection materials (male side) 100A and 100B are mounted from both sides in connection receiving holes arranged facing the axial direction of the straight connection portion 1A. Is done. The connection materials 100A and 100B of each cable have a prefabricated structure well known to those skilled in the art, and connection terminals (plugs 10, 11, multi-ram band 13 and retaining device 14 etc.) formed at the end of the cable, stress It is composed of connecting parts such as a cone 44, a push fitting 43, a compression device 42, and a cable protection fitting 41, and is connected to the sleeve-like inner conductor 2. An outer case 15 is disposed on the outer periphery of the straight connection portion 1A.
[0006]
As shown in FIG. 11, the linear connecting portion 1A having the above configuration is attached to a support S such as a concrete pillar in a substantially horizontal state. In the case of a three-phase cable, three straight connection portions 1A are provided in parallel.
[0007]
[Problems to be solved by the invention]
However, when the CV cables 4A and 4B are connected using the conventional straight connection portion 1A, the wires are extended along the messenger wire because of various attachment devices arranged on the concrete pillar. In order to introduce the existing cable into the straight connection portion 1A, each cable is formed with two arc portions R ₁ and R _{2 in the} vicinity of the straight connection portion, as shown by a one-dot chain line in FIG. It is necessary to bend the connection materials 100A and 100B of the respective cables into the connection receiving holes of the linear connection portion 1A by curving into a so-called secondary arc shape. In order to bend the CV cables 4A and 4B into a secondary arc shape for connection to the straight connection portion 1A, the work areas L ₁ and L _{2 in} the horizontal and vertical directions become large, and the entire connection portion becomes large. In addition, the increase in the vertical work area L ₂ necessitates an increase in the length of the utility pole due to the ground height limitation. In addition, it is difficult to connect the cables 4A and 4B to the straight connection portion 1A, and the work efficiency is poor.
[0008]
Therefore, the object of the present invention is to reduce the size of the entire connecting portion, eliminate the need for a long utility pole, facilitate cable connection work, and significantly improve work efficiency. Is to provide a department.
[0009]
[Means for Solving the Problems]
The above object is achieved by the cable connecting portion according to the present invention. In summary, the present invention includes an inner conductor and a bushing integrally formed of an insulating material around the inner conductor, and is formed by a connection hole of the inner conductor and a receiving hole of the bushing. In the cable connection part for mounting on the support, in which the connection material of the aerial cable is mounted in each of the two connection receiving holes,
Each connection receiving hole is formed to open upward, and the two connection receiving holes are formed to expand upward in a V shape, and the connection material of each overhead cable is mounted from above. Made possible
The cable is prevented from being pulled out from the cable connection portion between the plug fixed to the end conductor portion of the end-treated cable in the connection material of the aerial cable and the insulator end face of the end-treated cable. setting the anchor device for,
The plug is formed by an inner plug fixed to the tip conductor portion, and an outer plug that is attached to the inner plug and electrically contacts the connection hole of the inner conductor,
The retaining device is:
(A) a substantially cylindrical inner clasp disposed between the inner plug and the cable insulator end surface, an outer clasp attached to a tip of the inner clasp, and the inner clasp An intermediate fastening device disposed in an annular space formed by a tool and the outer fastening device,
(B) The inner side fastening tool is attached to the outer periphery of the tip conductor part, and on the opposite side of the tip to which the outer side fastening tool is attached, a stopper flange is formed protruding to the outer periphery,
(C) The outer side fastening tool includes a mounting portion that is attached to the inner side fastening device, and a cylindrical portion that is integrally formed with the mounting portion and extends substantially concentrically with the inner fastening device. In the cylindrical portion, a plurality of locking holes are formed, and locking balls are movably disposed.
(D) When the cable is connected to the cable connection portion, the lower end surface of the outer pulling fastener abuts against shoulder portions of the small diameter portion and the large diameter portion formed in the connection hole of the inner conductor. The outer peripheral surface is fitted to the large diameter portion of the connection hole,
(E) The intermediate clasp is formed integrally with the guide portion, the guide portion engaging with the locking ball and guiding the locking ball into the locking hole, and the cable insulator. A spring receiving portion having an inner diameter larger than the outer diameter of the cable, and a push ring is disposed on the outer peripheral portion of the cable so as to face the spring receiving portion above the spring receiving portion,
(F) Compression coil springs are respectively disposed between the guide portion and the attachment portion of the outer retaining device, and between the spring receiving portion and the push ring, and the guide portion and the outer retaining member. The compression coil spring disposed between the mounting portion of the tool has a weaker spring force than the compression coil spring disposed between the spring receiving portion and the push ring.
This is a cable connecting portion.
[0011]
According to one embodiment of the present invention, located between the two connecting receiving hole connecting material of the aerial cable is attached, the other extends downwardly on the opposite side to the connection receiving bore A connection receiving hole is formed, and a voltage detector can be attached to the connection receiving hole.
[0012]
According to another embodiment of the present invention, three cable connection portions are juxtaposed and used for connecting a three-phase overhead cable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the cable connection part according to the present invention will be described in more detail with reference to the drawings.
[0014]
Example 1
FIG. 1 shows an embodiment of a cable connecting portion 1 of the present invention. In the present embodiment, the connecting portion 1 will be described as a U-shaped connecting portion, but is not limited thereto.
[0015]
In this embodiment, the U-shaped connecting portion 1 includes an internal conductor (embedded electrode) 2, and an insulating bushing 3 formed of an insulating material such as epoxy resin is integrated around the internal conductor 2. It is molded into.
[0016]
The U-shaped connection portion 1 is formed with a connection receiving hole that can be attached to each of the connection materials (connection tip portions) 100A and 100B of the aerial cables 4A and 4B to be connected.
That is, in this embodiment, two connection receiving holes are formed in the U-shaped connecting portion 1 in parallel with each other. In FIG. 1, the left side connecting receiving hole of the U-shaped connecting portion 1 has an overhead cable 4A on one side. The connection material (connection tip portion) 100A can be attached, and the connection material (connection tip portion) 100B of the aerial cable 4B on the other side can be attached to the right connection receiving hole.
[0017]
Each connection receiving hole is formed by a connection hole 20 formed in the inner conductor 2 and a receiving hole 30 communicating with the connection hole 20 and formed in the bushing 3 and having an upper opening. As shown in FIG. 2, the connection hole 20 of the inner conductor 2 has a small diameter portion 20A and a large diameter portion 20B.
[0018]
An example of the configuration of the cable connection materials 100A and 100B connected to the U-shaped connecting portion 1 will be described. According to the present embodiment, since the cable connection materials 100A and 100B have the same structure, only the connection material 100A of the cable 4A will be described.
[0019]
Referring to FIG. 2, a plug for making electrical contact with the inner conductor 2 is attached to the end conductor portion 40 of the cable 4 A that is exposed after being subjected to the terminal treatment. The plug is fitted to the conductor portion 40 in an almost half region from the tip of the tip conductor portion 40, and an inclined cylindrical inner plug 10 having a slit formed on the outer periphery, and an outer portion attached to the inner plug 10. And a plug 11. The outer plug 11 has a sloped inner surface complementary to the outer periphery of the inner plug 10, and engages with the inner plug 10 to have a rusting action, thereby compressing and fixing the inner plug 10 to the tip conductor portion 40. An annular groove 12 is formed on the outer peripheral surface of the outer plug 11, and a contactor 13 such as a multi-ram band configured by arranging a large number of ribbon-like leaf spring assemblies in an annular shape is disposed therein. ing. When the cable 4A is connected to the U-shaped connecting portion 1, the multi-ram band 13 is adapted to the small diameter portion 20A of the connecting hole 20 of the inner conductor 2 and makes electrical contact.
[0020]
According to the present embodiment, the leading end conductor portion 40 prevents the cable 4A from being pulled out from the connecting portion 1 between the inner plug 10 fixed to the leading end conductor portion 40 and the cable insulator end face 46. A retaining device 50 is arranged.
[0021]
The retaining device 50 comprises a generally cylindrical inner retaining device 51 disposed between the inner plug 10 and the cable insulator end face 46, as well understood with reference to FIG. The front end of the fastener 51, that is, the outer retaining member 53 attached by screwing to the screw portion 52 formed on the inner plug 10 side. The inner fastening tool 51 is attached to the outer periphery of the conductor portion via an O-ring 54, and a stop flange 55 is formed on the opposite side to the screw portion 52 so as to protrude to the outer periphery. The O-ring 54 functions to position the inner catching tool 51 on the outer peripheral portion of the conductor portion with the same axis with respect to the conductor portion 40 by self-alignment.
[0022]
The outer retaining member 53 includes a mounting portion 56 that is screwed to the inner retaining member 51, and a cylindrical portion that is integrally formed with the attaching portion 56 and extends substantially concentrically with the inner retaining member 51. 57. A plurality of, for example, 4 to 8 locking holes 58 are formed in the cylindrical portion 57 at equal intervals, and the locking balls 59 are movably disposed. Further, the lower end surface 60 of the outer catch 53 is connected to the shoulder 21 (see FIG. 5) of the small diameter portion 20A and the large diameter portion 20B of the connection hole 20 of the inner conductor 2 when the cable 4A is connected to the U-shaped connection portion 1. 2) and the outer peripheral surface is fitted into the large diameter portion 20B of the connection hole 20 of the inner conductor 2.
[0023]
The retaining device 50 further includes an intermediate retaining member 61. The intermediate clasp 61 is located in the annular space 62 formed by the inner clasp 51 and the outer clasp 53 and engages with the locking ball 59, and the locking ball 59 is engaged with the locking hole. 58, and a guide portion 63 that is guided into 58 and a spring receiving portion 64 that is formed integrally with the guide portion 63 and has an inner diameter larger than the outer diameter of the cable insulator 47. A push ring 65 is disposed on the outer peripheral portion of the cable so as to face the spring receiving portion 64 above the spring receiving portion 64. In addition, compression coil springs 66 and 67 are disposed between the guide portion 63 and the attachment portion 56 of the outer retaining member 53 and between the spring receiving portion 64 and the push ring 65, respectively. The compression coil spring 66 has a weaker spring force than the compression coil spring 67. This point will be further described later .
Next, a procedure for attaching / detaching the cable connecting material 100A to / from the U-shaped connecting portion 1 of the present invention configured as described above will be described.
[0024]
First, the cable connecting material 100A is assembled as shown in FIG. That is, the cable 4A connected to the U-shaped connecting portion 1 passes the protective metal fitting 41, the compression device 42, the push metal fitting 43, the stress cone 44, etc. through the terminal portion of the cable that has been subjected to the terminal treatment, and then is drawn into the conductor portion 40. A fastening device 50 is mounted. At this time, the intermediate fastening device 61 of the fastening device 50 is biased by the springs 66 and 67, and the guide portion 63 is in contact with the fastening flange 55 of the inner fastening device 51. Accordingly, the locking ball 59 is movable inward in the radial direction from the locking hole 58, and the ball 59 falling inward is supported by the compression coil spring 66. Next, the connection plug, that is, the inner plug 10 and the outer plug 11 including the multi-ram band 13 are fixed to the tip conductor portion 40 as described above.
[0025]
Next, as shown in FIG. 5, when the connection material (connection tip portion) 100 A of the cable 4 A is inserted into the connection receiving hole, the outer plug 11 having the multi-ram band 13 becomes the small diameter portion 20 A of the connection hole 20 of the inner conductor 2. To make electrical contact. The outer retainer 53 of the retaining device 50 is inserted in conformity with the large-diameter portion 20B of the connection hole 20 of the inner conductor 2. Further, when the stress cone 44 is pushed into the receiving hole 30, the end face 44A of the stress cone 44 comes into contact with the push ring 65, and the push ring 65 is pushed toward the inner conductor 2 side.
[0026]
At this time, as described above, since the compression coil spring 67 has a larger spring force than the compression coil spring 66, the compression coil spring 67 is compressed more by the compression coil spring 67. 61 moves to the plug side inwardly against the spring force of the compression coil spring 66.
[0027]
As a result, the locking ball 59 is moved radially outward in the locking hole 58 by the guide portion 63, and the locking ball 59 is moved to the annular concave groove 22 formed in the large diameter portion 20 B of the internal conductor 2. Push in. Accordingly, the cable 4A is locked to the U-shaped connecting portion 1 and is prevented from being pulled out from the U-shaped connecting portion 1. In this state, it is possible to confirm whether or not the cable 4A is securely locked to the U-shaped connecting portion 1 by applying a force in a direction in which the cable 4A is pulled out from the U-shaped connecting portion 1. That is, as described above, the compression coil spring 67 has a larger spring force than the compression coil spring 66, so even if a force is applied in the direction in which the cable 4 A is pulled out from the U-shaped connecting portion 1, the compression coil spring 66. Is compressed by the compression coil spring 67, and the locking ball 59 maintains the state of being moved radially outward in the locking hole 58 by the guide portion 63.
[0028]
After confirming that the cable 4 A is securely locked to the U-shaped connection portion 1, the stress cone 44 is further pressed toward the connection portion by the pressing metal fitting 43 and the compression fitting 42, and the protective metal fitting 41 is attached to the bushing 3. Fixed to the end face. Further, as shown in FIG. 2, the waterproof cover 48 is fixed to the metal case 49 of the connecting portion 1 with a bolt or the like.
[0029]
When the cable connected to the U-shaped connecting portion 1 is removed from the connecting portion, the work procedure at the time of connection is reversed.
[0030]
That is, first, the waterproof cover 48 is removed, and the protective metal fitting 41, the compression device 42, and the push metal fitting 43 are shifted to predetermined positions.
[0031]
The stress cone 44 is then withdrawn from the bushing receiving hole 30 and retracted. The push ring 65 and the intermediate clasp 61 are moved together with the stress cone 44 retracted by the coil springs 66 and 67, and the latching state with the latch ball 59 pushed into the annular concave groove 22 of the inner conductor 2 is maintained. To be released. Thereby, the lock | rock with respect to the U-shaped connection part 1 of cable 4A is cancelled | released, and extraction from the U-shaped connection part 1 of cable 4A is attained.
[0032]
As described above, according to the present embodiment, the movement of the stress cone 44 at the time of cable separation is performed by the locking ball 59 indented in the annular groove 22 of the inner conductor 2 and the guide of the intermediate clasp 51. It is sufficient that the locked state with the part 63 is released.
[0033]
As described above, the cable connection material 100B is configured in the same manner as the cable connection material 100A and operates in the same manner.
[0034]
According to the U-shaped connection portion 1 of the present invention configured as described above, the cable connection materials 100A and 100B can be attached to the U-shaped connection portion 1 from above as shown in FIG. .
[0035]
In other words, cable 4A being extended line along the messenger wire, 4B, as shown in FIG. 6 in dashed line, it is bent at substantially one arc portion R _1, then connecting material of each cable 100A and 100B are attached to the connection receiving holes of the U-shaped connecting portion 1 in a state in which the CV cables 4A and 4B are curved in a primary arc shape forming one arc portion R. Therefore, the horizontal and vertical lengths L ₁ and L ₂ necessary for bending the cables 4A and 4B are greatly shortened compared to the lengths L ₁ and L ₂ when the cable is connected to the conventional straight connection portion 1A. can do. This has the advantage that the work area range can be set to a length suitable for work, and work efficiency can be improved.
[0036]
When the U-shaped connecting portion 1 of the present invention is used to connect a three-phase overhead cable, as shown in FIG. 7, each of the input and output cables 4A and 4B for each phase (R, S, T) The U-shaped connecting part 1 is required, and therefore three U-shaped connecting parts are used in parallel. If desired, three U-shaped connecting portions can be integrally formed.
[0037]
Example 2
In the first embodiment, the cable connecting portion 1 is described as a U-shaped connecting portion in which two connection receiving holes are formed vertically and in parallel to each other. However, as shown in FIG. It is also possible for the two connection receiving holes to expand upward in a V shape at an angle α, ie, a V-shaped connection. The V-shaped spread angle α is normally about 90 °.
[0038]
Since the V-shaped connecting portion of the present embodiment is configured in the same manner as the U-shaped connecting portion of the first embodiment, detailed description thereof is omitted.
[0039]
In the present embodiment, as in the first embodiment, the connection materials 100A and 100B of each cable are obtained by bending the CV cables 4A and 4B into a primary arc shape in which one arc portion R is formed. It can be attached to the connection receiving hole.
Accordingly, also in this embodiment, the horizontal and vertical lengths L ₁ and L ₂ necessary for bending the cables 4A and 4B are significantly larger than the length when the cable is connected to the conventional linear connection portion 1A. It can be shortened. This has the advantage that the work area range can be set to a length suitable for work, and work efficiency can be improved.
[0040]
Example 3
FIG. 9 shows another embodiment of the cable connecting portion 1 of the present invention. In the present embodiment, the connection portion 1 is a Y-shaped branch connection portion.
[0041]
In this embodiment, the Y-shaped branch connection portion 1 is provided with an internal conductor (embedded electrode) 2 having a substantially Y-shape, and an insulating material supposed to be an epoxy resin or the like around the internal conductor 2. The body Y-shaped bushing 3 is integrally formed.
[0042]
A connection material (connection tip) 100A of one aerial cable 4A can be attached to one side of the Y-shaped branch connection portion 1, and a material (connection tip) of the other aerial cable 4B is attached to the other side. 100B can be mounted. This configuration is the same as the U-shaped connecting portion of the first embodiment, and further description thereof is omitted.
[0043]
In the Y-shaped connection portion 1 of the present embodiment, the voltage detector 200 is interposed between the connection receiving hole in which the connection material 100A of the overhead cable 4A is mounted and the connection reception hole in which the connection material 100B of the overhead cable 4B is mounted. The third connection receiving hole is different in that a third connection receiving hole is formed. Since a person skilled in the art is well aware of the configuration of the voltage detector 200 that can detect from the outside whether or not power is being applied to the power transmission and distribution system during maintenance, further detailed description thereof is omitted.
[0044]
The third connection receiving hole for the voltage detector 200 extends downward and opens in the opposite direction to the connection receiving hole for the overhead cable 4A and the overhead cable 4B. The third connection receiving hole is also formed by a connection hole 20 formed in the inner conductor 2 and a receiving hole 30 formed in the bushing 3 in communication with the connection hole 20. As shown in FIG. 9, the connection hole 20 of the inner conductor 2 has a small diameter portion 20A and a large diameter portion 20B. As shown in FIG. 9, the connection receiving hole is fitted with a voltage detector 200 and covered with a cylindrical cover 201.
[0045]
Of course, the third connection receiving hole for the voltage detector 200 described in the present embodiment can be provided in the V-shaped connection portion of the second embodiment as well.
[0046]
【The invention's effect】
As described above, the cable connection portion of the present invention includes an internal conductor and a bushing integrally formed of an insulating material around the internal conductor, and includes a connection hole of the internal conductor and a receiving hole of the bushing. In the cable connection part for mounting and using on the support, the connection material of the aerial cable is attached to each of the two connection receiving holes formed in the above, each connection receiving hole is formed to open upward, In addition, the two connection receiving holes are formed to expand upward in a V shape so that the connection material of each aerial cable can be mounted from above, and the end conductor of the end-treated cable in the connection material of the aerial cable A retaining device for preventing the cable from being pulled out from the cable connecting portion is provided between the plug fixed to the portion and the insulator end surface of the terminal-treated cable;
The plug is formed by an inner plug fixed to the leading end conductor portion, and an outer plug that is attached to the inner plug and electrically contacts the connection hole of the inner conductor,
The retaining device is:
(A) a substantially cylindrical inner clasp disposed between the inner plug and the cable insulator end surface, an outer clasp attached to a tip of the inner clasp, and the inner clasp An intermediate fastening device disposed in an annular space formed by a tool and the outer fastening device,
(B) The inner side fastening tool is attached to the outer periphery of the tip conductor part, and on the opposite side of the tip to which the outer side fastening tool is attached, a stopper flange is formed protruding to the outer periphery,
(C) The outer side fastening tool includes a mounting portion that is attached to the inner side fastening device, and a cylindrical portion that is integrally formed with the mounting portion and extends substantially concentrically with the inner fastening device. In the cylindrical portion, a plurality of locking holes are formed, and locking balls are movably disposed.
(D) When the cable is connected to the cable connection portion, the lower end surface of the outer pulling fastener abuts against shoulder portions of the small diameter portion and the large diameter portion formed in the connection hole of the inner conductor. The outer peripheral surface is fitted to the large diameter portion of the connection hole,
(E) The intermediate clasp is formed integrally with the guide portion, the guide portion engaging with the locking ball and guiding the locking ball into the locking hole, and the cable insulator. A spring receiving portion having an inner diameter larger than the outer diameter of the cable, and a push ring is disposed on the outer peripheral portion of the cable so as to face the spring receiving portion above the spring receiving portion,
(F) Compression coil springs are respectively disposed between the guide portion and the attachment portion of the outer retaining device, and between the spring receiving portion and the push ring, and the guide portion and the outer retaining member. Since the compression coil spring disposed between the mounting portion of the tool is configured to have a weaker spring force than the compression coil spring disposed between the spring receiving portion and the push ring, the entire connection portion It is possible to reduce the size of the cable, to make it unnecessary to lengthen the power pole, to facilitate the cable connection work, and to significantly improve the work efficiency. Further, even if the connection receiving hole is formed in a V shape, the cable can be prevented from being pulled out.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a cable connecting portion according to the present invention.
FIG. 2 is a partially enlarged view of the cable connecting portion of FIG.
FIG. 3 is a cross-sectional view illustrating a configuration of a retaining device.
FIG. 4 is a view for explaining an assembling procedure of a cable connecting material.
FIG. 5 is a view for explaining an assembling procedure of the cable connecting material.
FIG. 6 is a diagram for explaining a connection mode of a cable using a cable connection portion according to the present invention.
FIG. 7 is a perspective view of a cable connection portion for connecting a three-phase aerial cable using the cable connection portion according to the present invention.
FIG. 8 is a cross-sectional view showing another embodiment of the cable connecting portion according to the present invention.
FIG. 9 is a cross-sectional view showing another embodiment of the cable connecting portion according to the present invention.
FIG. 10 is a cross-sectional view of a conventional cable straight line connecting portion.
FIG. 11 is a diagram illustrating a connection mode of a cable using a conventional cable straight line connecting portion.
[Explanation of symbols]
1 Cable connection 2 Inner conductor (embedded electrode)
3 Bushing 4A, 4B Cable 10 Inner plug 11 Outer plug 13 Contact (multi-ram band)
20 Connecting hole 30 Receiving hole 40 Tip conductor part 41 Protective bracket 42 Compressor 43 Pressing bracket 44 Stress cone 50 Retaining device 100A, B Cable connecting material 200 Voltage detector

Claims

An internal conductor and a bushing integrally formed of an insulating material around the internal conductor, and each of the two connection reception holes formed by the connection hole of the internal conductor and the reception hole of the bushing is aerial. In the cable connection part to be used on the support, to which the cable connection material is attached,
Each connection receiving hole is formed to open upward, and the two connection receiving holes are formed to expand upward in a V shape, and the connection material of each overhead cable is mounted from above. Made possible
The cable is prevented from being pulled out from the cable connection portion between the plug fixed to the end conductor portion of the end-treated cable in the connection material of the aerial cable and the insulator end face of the end-treated cable. setting the anchor device for,
The plug is formed by an inner plug fixed to the tip conductor portion, and an outer plug that is attached to the inner plug and electrically contacts the connection hole of the inner conductor,
The retaining device is:
(A) a substantially cylindrical inner clasp disposed between the inner plug and the cable insulator end surface, an outer clasp attached to a tip of the inner clasp, and the inner clasp An intermediate fastening device disposed in an annular space formed by a tool and the outer fastening device,
(B) The inner side fastening tool is attached to the outer periphery of the tip conductor part, and on the opposite side of the tip to which the outer side fastening tool is attached, a stopper flange is formed protruding to the outer periphery,
(C) The outer side fastening tool includes a mounting portion that is attached to the inner side fastening device, and a cylindrical portion that is integrally formed with the mounting portion and extends substantially concentrically with the inner fastening device. In the cylindrical portion, a plurality of locking holes are formed, and locking balls are movably disposed.
(D) When the cable is connected to the cable connection portion, the lower end surface of the outer pulling fastener abuts against shoulder portions of the small diameter portion and the large diameter portion formed in the connection hole of the inner conductor. The outer peripheral surface is fitted to the large diameter portion of the connection hole,
(E) The intermediate clasp is formed integrally with the guide portion, the guide portion engaging with the locking ball and guiding the locking ball into the locking hole, and the cable insulator. A spring receiving portion having an inner diameter larger than the outer diameter of the cable, and a push ring is disposed on the outer peripheral portion of the cable so as to face the spring receiving portion above the spring receiving portion,
(F) Compression coil springs are respectively disposed between the guide portion and the attachment portion of the outer retaining device, and between the spring receiving portion and the push ring, and the guide portion and the outer retaining member. The compression coil spring disposed between the mounting portion of the tool has a weaker spring force than the compression coil spring disposed between the spring receiving portion and the push ring.
A cable connection part characterized by that.

The connection material of the aerial cable is located between the two connection receiving holes, and extends downward on the opposite side of the connection receiving hole to form another connection receiving hole. The cable connecting portion according to claim 1, wherein a voltage detector can be attached to the receiving hole.

It said cable connecting portion and three juxtaposed, cable connection of claim 1 or 2, characterized in that used for 3-phase overhead cabling.