JP3796871B2

JP3796871B2 - Gas insulated current transformer

Info

Publication number: JP3796871B2
Application number: JP00931097A
Authority: JP
Inventors: 芳樹川渕; 賢司小林; 宗一中島
Original assignee: Nissin Electric Co Ltd
Current assignee: Nissin Electric Co Ltd
Priority date: 1997-01-22
Filing date: 1997-01-22
Publication date: 2006-07-12
Anticipated expiration: 2017-01-22
Also published as: JPH10208962A

Description

【０００１】
【発明の属する技術分野】
本発明は、電力系統の電流を監視するために用いるガス絶縁変流器に関するものである。
【０００２】
【従来の技術】
ガス絶縁変流器は、開口部がコーン状の絶縁スペーサにより気密に閉じられて内部に絶縁ガスが封入された金属製の容器と、該容器内に収納された変流器本体とを備えている。絶縁スペーサを貫通した状態で環状の外側端子導体が設けられるとともに、該外側端子導体の内側に内側端子導体が同軸的に（中心軸線を共有した状態で）設けられ、該外側端子導体と内側端子導体とにより同軸端子導体が構成されている。また容器内には、変流器本体の一次コイルの一端に一端が接続された中空管状の外側接続導体と該外側接続導体の内側に配置されて一端が変流器本体の一次コイルの他端に接続された内側接続導体とからなる同軸往復導体が設けられ、同軸端子導体を構成する外側端子導体及び内側端子導体がそれぞれ同軸往復導体を構成する外側接続導体及び内側接続導体を通して変流器本体の一次コイルの一端及び他端に接続されている。
【０００３】
従来のガス絶縁変流器では、絶縁スペーサに設けられた同軸端子導体の内側端子導体と、容器内に設けられた同軸往復導体の内側接続導体とがチューリップコンタクトを介して接続されていた。
【０００４】
【発明が解決しようとする課題】
従来のガス絶縁変流器では、絶縁スペーサに設けられた同軸端子導体の内側端子導体を同軸往復導体の内側接続導体に接続する手段として、構造が複雑なチューリップコンタクトを用いていたため、コストが高くなるのを避けられなかった。
【０００５】
また通電容量が大きい場合、チューリップコンタクトは大形になるため、同軸端子導体と同軸往復導体との接続部が大形化して変流器が大形になるという問題があった。
【０００６】
そこで、内側端子導体の同軸往復導体側の端部に管状部を形成して該管状部を雌形コンタクト部とするとともに、内側接続導体の同軸端子導体側の端部を棒状に形成して該棒状の端部を雄形コンタクト部とし、該雄形コンタクト部をルーバコンタクトを介して雌形コンタクト部に嵌め合い構造で接続するガス絶縁変流器が提案された。
【０００７】
ルーバーコンタクトは、銅などの良導体金属からなる板に多数のスリットを形成して、各スリットのエッジ部分を板面から突出させるように変形させることにより多数のルーバ状の接点部を形成したもので、板面から突出したエッジ部分が、相手側のコンタクト部に食い込むようにして接触する。このルーバーコンタクトは、全体が環状をなすように形成されて、雄形コンタクト部の外周に設けられた溝内に嵌合させた状態で取り付けられる。
【０００８】
上記のように内側端子導体及び内側接続導体にそれぞれ管状の雌形コンタクト部及び棒状の雄形コンタクト部を設けて、両コンタクト部を嵌め合い構造で接続するようにすると、チューリップコンタクトを用いる場合に比べて部品点数を少なくして構造を簡単にすることができるため、同軸端子導体と同軸往復導体との接続部を小形に構成することができる。
【０００９】
また上記のように構成すると、雌形コンタクト部と雄形コンタクト部との間に介在させるルーバコンタクトの数を増やすだけで、両コンタクト部間を通して流し得る電流の容量を増大させることができるため、同軸端子導体と同軸往復導体との接続部を大形にすることなく、電流容量の増大に対応することができる。
【００１０】
しかしながら、上記のようにルーバコンタクトを使用する場合には、内側端子導体に設ける雌形コンタクト部と内側接続導体に設ける雄形コンタクト部との間の隙間の寸法精度を０．１［mm］程度の精度で管理する必要があるため、同軸端子導体と同軸往復導体との接続部の組立て精度を高くするために特別の配慮が必要になって、コストが高くなるという問題があった。
【００１１】
また同軸往復導体を構成する外側接続導体と内側接続導体とは、僅かな間隔を隔てて同軸的に配置されるため、同軸端子導体と同軸往復導体との接続部を組立てる際に、万一雄形コンタクト部と雌形コンタクト部とが偏心した状態になると、同軸往復導体の内側接続導体と外側接続導体とが接触して変流器が機能しなくなるおそれがあった。
【００１２】
本発明の目的は、同軸端子導体と同軸往復導体との接続部が大形化するのを防止するとともに構造の簡素化を図ってコストを引き下げることができるようにしたガス絶縁変流器を提供することにある。
【００１３】
本発明の他の目的は、ルーバコンタクトを使用するために必要とされる組立精度を容易に出すことができるようにしたガス絶縁変流器を提供することにある。
【００１４】
【課題を解決するための手段】
本発明は、開口部が絶縁スペーサにより気密に閉じられて内部に絶縁ガスが封入された容器と、該容器内に収納された変流器本体と、絶縁スペーサを貫通した状態で設けられた環状の外側端子導体及び該外側端子導体の内側に同軸的に設けられた内側端子導体を有する同軸端子導体と、変流器本体の一次コイルの一端に接続された中空管状の外側接続導体及び該外側接続導体の内側に同軸的に配置されて一次コイルの他端に接続された内側接続導体を有する同軸往復導体とを備えて、外側端子導体及び内側端子導体がそれぞれ外側接続導体及び内側接続導体を介して変流器本体の一次コイルの一端及び他端に接続されるガス絶縁変流器に係わるものである。
【００１５】
本発明においては、同軸端子導体を構成する外側端子導体及び内側端子導体を、スリーブ状の第１の絶縁部材を介して嵌め合わせることにより同軸的に位置決めする。また、同軸往復導体の外側接続導体及び内側接続導体をスリーブ状の第２の絶縁部材を介して嵌め合わせることにより同軸的に位置決めし、内側端子導体及び内側接続導体の一方及び他方にそれぞれ雌形コンタクト部及び雄形コンタクト部を設けて雄形コンタクト部をルーバコンタクトを介して雌形コンタクト部に接触させる。更に、外側端子導体と外側接続導体とを、雌形コンタクト部を同心的に取り囲むように設けたアダプタ導体を介して接続し、アダプタ導体と雌形コンタクト部との間に介在するスリーブ状の第３の絶縁部材を設けて、該第３の絶縁部材により雌形コンタクト部とアダプタ導体とを同心的に位置決めする。
【００１６】
上記のように、同軸端子導体を構成する外側端子導体と内側端子導体とを絶縁物を介して嵌め合わせ、同軸往復導体を構成する外側接続導体と内側接続導体とを絶縁物を介して嵌め合わせるとともに、アダプタ導体と雌形コンタクト部とを絶縁物を介して嵌め合わせる構造にすると、同軸端子導体と同軸往復導体との接続部を所定の順序で組立てるだけで、これらの導体の中心軸線を一致させることができるため、組立てを容易にして、コストの低減を図ることができる。また同軸端子導体及び同軸往復導体をそれぞれ構成する導体の中心軸線を常に一致させることができるため、コンタクト部の隙間を常にルーバコンタクトの使用に適した大きさに管理して所定の通電性能を得ることができる。
【００１７】
【発明の実施の形態】
図１は本発明に係わるガス絶縁変流器の構造を示したもので、同図において１は上端に開口部１ａを有する金属容器、２は容器１の開口部１ａを気密に閉じるように取り付けられた絶縁スペーサ、３は絶縁スペーサ２に取り付けられた同軸端子導体、４は容器１内に収納された変流器本体、５は同軸端子導体３と変流器本体との間を接続する同軸往復導体であり、容器１内には絶縁ガスとしてＳＦ₆ガス６が所定の圧力で封入されている。
【００１８】
金属容器１は、縦断面の輪郭形状がほぼ円弧状を呈するように形成された底部１ｂを有し、該底部１ｂ寄りの部分に取付け金具１０１が溶接されている。取付け金具１０１は、ベース板７に固定された支持台８にボルト止めされ、該支持台８により、金属容器１がその軸線を垂直方向に向けた状態で支持されている。容器１の上端の開口部にはフランジ金具１０２が溶接され、該フランジ金具１０２に環状のフランジ板１０３がボルト止めされている。
【００１９】
絶縁スペーサ２は、エポキシ樹脂などの絶縁材料によりコーン状に形成された周知のもので、その外周に形成されたフランジ部２ａがフランジ板１０３にボルト止めされている。
【００２０】
図２に詳細に示したように、同軸端子導体３は、絶縁スペーサ２の中央部を気密に貫通させた状態で取り付けられた環状の外側端子導体３０１と、該外側端子導体の内側に同軸的に配置された円柱状の内側端子導体３０２とからなっている。外側端子導体３０１と内側端子導体３０２とは、両者間にスリーブ状の第１の絶縁部材９を介在させた状態で、きつく嵌め合わされて（嵌め合い構造で）気密に結合されている。内側端子導体３０２の容器１内に位置する部分は管状に形成され、該管状の部分により雌形コンタクト部３０２ａが構成されている。雌形コンタクト部３０２ａの先端部の外径を小さくすることにより該コンタクト部３０２ａの先端に薄肉部３０２ａ1 が形成されている。後記する雄形コンタクト部の挿入を容易にするため、薄肉部３０２ａ1 の先端部の内側の部分にはアールが付けられている。
【００２１】
変流器本体４は、所定のターン数（図示の例では１ターン）を有するように巻回された一次コイル４０１と、一次コイル４０１と鎖交するように設けられた環状の鉄心に巻回された二次コイル４０２とからなっている。一次コイル４０１及び二次コイル４０２はそれぞれ電界緩和用シールドで覆われていて、適宜の手段により容器１に対して固定されている。
【００２２】
変流器本体４の一次コイル４０１の両端は、変流器本体と絶縁スペーサとの間を容器１の中心軸線に沿って伸びるように設けられた同軸往復導体５を通して同軸端子導体３に接続されている。
【００２３】
図２に示したように、同軸往復導体５は、外側端子導体３０１と同軸的に（軸線を共有した状態で）設けられた管状の外側接続導体５０１と、該外側接続導体５０１の内側に配置された内側接続導体５０２とからなっていて、外側接続導体５０１の一端、及び内側接続導体５０２の一端が、それぞれ一次コイル４０１の一端及び他端に接続されている。外側接続導体５０１及び内側接続導体５０２は、スリーブ状に形成された第２の絶縁部材１０を介して嵌め合わされてそれぞれの軸線を共有するように位置決めされている。
【００２４】
内側接続導体５０２の他端には、外側接続導体５０１の他端から内側端子導体３０２側に突出した棒状の雄形コンタクト部５０２ａが形成されている。雄形コンタクト部５０２ａの外周には、その軸線方向に並べた状態で複数（図示の例では３個）の溝が設けられていて、これらの溝内にそれぞれルーバコンタクト１１が取り付けられている。図４に示したように、ルーバコンタクト１１は、銅などの良導電性を有する金属からなる板に多数のスリットを形成して、各スリットのエッジ部分を板面から突出させるように変形させることにより多数のルーバ状の接点部１１ａを形成したものをリング状に成形したもので、各接点部１１ａのエッジ部分が、相手側のコンタクト部に食い込むようにして接触する。
【００２５】
雄形コンタクト部５０２ａは、同軸端子導体３の内側端子導体３０２に形成された雌形コンタクト部３０２ａの内側に挿入されて、ルーバコンタクト１１を介して該雌形コンタクト部３０２ａに接触させられている。
【００２６】
また雌形コンタクト部３０２ａを同軸的に囲むように管状のアダプタ導体１２が設けられていて、該アダプタ導体１２の軸線方向の一端及び他端にそれぞれ設けられたフランジ１２ａ及び１２ｂがボルト１３及び１４により外側端子導体３０１及び外側接続導体５０１に接続されている。アダプタ導体１２の外側端子導体３０１側の端部の内周、及び外側接続導体５０１側の端部の内周には、それぞれ拡大径部１２ｃ及び１２ｄが形成され、拡大径部１２ｄの内周に、アダプタ導体と雌形コンタクト部との間に介在するスリーブ状の第３の絶縁部材１５が嵌合されている。絶縁部材１５の内周に雌形コンタクト部３０２ａの先端の薄肉部３０２ａ1 が嵌合され、これにより、雌形コンタクト部３０２ａとアダプタ導体１２とが同軸的に位置決めされている。同軸端子導体３と同軸往復導体５との接続部を覆うように電界緩和用のシールド１６が取り付けられている。
【００２７】
図３は、上記同軸端子導体３と同軸往復導体５との接続部の組立方の一例を示したものである。この例では、先ず雌形コンタクト部３０２ａを同軸的に取り囲むようにアダプタ導体１２を配置し、該アダプタ導体１２の一端のフランジ１２ａを外側端子導体３０１にボルトで仮固定する。次いでアダプタ導体１２の拡大径部１２ｄの内周と雌形コンタクト部３０２ａの先端部の薄肉部３０２ａ1 との間の隙間にスリーブ状の第３の絶縁部材１５を嵌合させて固定する。ルーバコンタクト１１が取り付けられた同軸往復導体５の先端の雄形コンタクト部５０２ａを雌形コンタクト３０２ａの内側に挿入して、アダプタ導体１２のフランジ１２ｄを外側接続導体５０１にボルト止めする。その後シールド１６を取り付けて、同軸端子導体３と同軸往復導体５との接続部の組立を完了する。
【００２８】
上記のように、外側接続導体５０１と内側接続導体５０２と両導体間に介在する絶縁部材１０とを嵌め合い構造により同軸的に位置決めし、アダプタ導体１２と雌形コンタクト部３０２ａと絶縁部材１５とを嵌め合い構造により同軸的に位置決めするようにすると、組立を所定の順序で行うことにより、外側端子導体３０１、外側接続導体５０１、内側端子導体３０２、及び内側接続導体３０２のそれぞれの中心軸線を自動的に一致させることができる。したがって、特に面倒な組立作業を行うことなく、内側端子導体３０２の先端に形成した雌形コンタクト部３０２ａと内側接続導体５０２の先端に形成した雄形コンタクト部５０２ａとの間の隙間をルーバコンタクト１１の使用に適した大きさに管理することができ、組立に要するコストの低減を図ることができる。
【００２９】
また上記のように嵌め合い構造の雌形コンタクト及び雄形コンタクトと、両コンタクト間に介在するルーバコンタクトを用いて同軸端子導体と同軸往復導体との間の接続部を構成すると、チューリップコンタクトを用いる場合に比べて構造を簡単にすることができる。
【００３０】
上記の例では、３個のルーバコンタクトを設けているが、ルーバコンタクトの数は変流器の一次側に流す必要がある電流の大きさに応じて増減することができる。本発明によれば、軸線方向に並べて設けるルーバコンタクトの数を増やすことにより電流容量を増大させることができるため、同軸端子導体と同軸往復導体との間の接続部を大形にすることなく、一次通電容量の増大に対応することができる。
【００３１】
上記の例では、内側端子導体３０２の先端に雌形コンタクト部３０２ａを設け、内側接続導体５０１の先端に雄形コンタクト部５０２ａを設けたが、内側端子導体３０２の先端に雄形コンタクト部を設け、内側接続導体５０２の先端に雌形コンタクト部を設けるようにしてもよい。
【００３２】
【発明の効果】
以上のように、本発明によれば、同軸端子導体の外側端子導体と内側端子導体とを絶縁物を介して嵌め合わせ、同軸往復導体の外側接続導体と内側接続導体とを絶縁物を介して嵌め合わせるとともに、アダプタ導体と雌形コンタクト部とを絶縁物を介して嵌め合わせる構造にして、同軸端子導体と同軸往復導体との接続部を所定の順序で組立てるだけで、これらの導体の中心軸線を一致させて雄形コンタクト部と雌形コンタクト部との間の隙間をルーバコンタクトの使用に適した大きさに管理することができるようにしたので、組立てを容易にして、コストの低減を図ることができる。
【００３３】
また本発明では、嵌め合い構造の雌形コンタクト及び雄形コンタクトと、両コンタクト間に介在するルーバコンタクトとを用いて同軸端子導体と同軸往復導体との間の接続部を構成したので、チューリップコンタクトを用いる場合に比べて該接続部の構造を簡単にして小形化を図ることができる。
【図面の簡単な説明】
【図１】本発明に係わるガス絶縁変流器の構成例を示した縦断面図である。
【図２】図１のＡ部の拡大図である。
【図３】図１の要部の組立順序を説明するための組立図である。
【図４】図１のガス絶縁変流器で用いるルーバコンタクトの一例を示す斜視図である。
【符号の説明】
１容器
２絶縁スペーサ
３同軸端子導体
３０１外側端子導体
３０２内側端子導体
３０２ａ雌形コンタクト部
４変流器本体
４０１一次コイル
４０２二次コイル
５同軸往復導体
５０１外側接続導体
５０２内側接続導体
５０２ａ雄形コンタクト
９第１の絶縁部材
１０第２の絶縁部材
１１ルーバコンタクト
１２アダプタ導体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas-insulated current transformer used for monitoring a current of a power system.
[0002]
[Prior art]
The gas-insulated current transformer includes a metal container in which an opening is hermetically closed by a cone-shaped insulating spacer and an insulating gas is sealed therein, and a current transformer body housed in the container. Yes. An annular outer terminal conductor is provided in a state of penetrating the insulating spacer, and an inner terminal conductor is provided coaxially (with the central axis shared) inside the outer terminal conductor, and the outer terminal conductor and the inner terminal A coaxial terminal conductor is constituted by the conductor. Also, in the container, a hollow tubular outer connecting conductor having one end connected to one end of the primary coil of the current transformer body, and one end disposed inside the outer connecting conductor, the other end of the primary coil of the current transformer body A current transformer main body is provided with a coaxial reciprocating conductor composed of an inner connecting conductor connected to the outer terminal conductor and the inner connecting conductor, each of which constitutes a coaxial reciprocating conductor. Are connected to one end and the other end of the primary coil.
[0003]
In the conventional gas insulated current transformer, the inner terminal conductor of the coaxial terminal conductor provided in the insulating spacer and the inner connection conductor of the coaxial reciprocating conductor provided in the container are connected via a tulip contact.
[0004]
[Problems to be solved by the invention]
The conventional gas-insulated current transformer uses a tulip contact having a complicated structure as a means for connecting the inner terminal conductor of the coaxial terminal conductor provided on the insulating spacer to the inner connecting conductor of the coaxial reciprocating conductor, which is expensive. It was inevitable to become.
[0005]
In addition, since the tulip contact becomes large when the current carrying capacity is large, there is a problem in that the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor becomes large and the current transformer becomes large.
[0006]
Therefore, a tubular portion is formed at the end of the inner terminal conductor on the coaxial reciprocating conductor side to make the tubular portion a female contact portion, and the end of the inner connection conductor on the coaxial terminal conductor side is formed in a rod shape. A gas-insulated current transformer has been proposed in which a rod-shaped end portion is a male contact portion, and the male contact portion is fitted and connected to the female contact portion via a louver contact.
[0007]
A louver contact is formed by forming a large number of louvered contact parts by forming a large number of slits in a plate made of a good conductor metal such as copper and deforming the edge portion of each slit so as to protrude from the plate surface. The edge portion protruding from the plate surface comes into contact with the counterpart contact portion. The louver contact is formed so as to form an annular shape as a whole, and is attached in a state of being fitted in a groove provided on the outer periphery of the male contact portion.
[0008]
When using a tulip contact by providing a tubular female contact part and a rod-shaped male contact part on the inner terminal conductor and the inner connection conductor as described above, and connecting both contact parts with a fitting structure, Since the number of parts can be reduced and the structure can be simplified, the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor can be made small.
[0009]
In addition, when configured as described above, it is possible to increase the capacity of the current that can flow through both contact parts simply by increasing the number of louver contacts interposed between the female contact part and the male contact part. An increase in current capacity can be accommodated without increasing the size of the connection between the coaxial terminal conductor and the coaxial reciprocating conductor.
[0010]
However, when the louver contact is used as described above, the dimensional accuracy of the gap between the female contact portion provided on the inner terminal conductor and the male contact portion provided on the inner connection conductor is about 0.1 [mm]. Therefore, there is a problem that the cost is increased because special consideration is required to increase the assembly accuracy of the connection portion between the coaxial terminal conductor and the coaxial reciprocating conductor.
[0011]
Also, since the outer connecting conductor and the inner connecting conductor constituting the coaxial reciprocating conductor are coaxially arranged with a slight gap, when assembling the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor, When the shape contact portion and the female contact portion are in an eccentric state, the inner connection conductor and the outer connection conductor of the coaxial reciprocating conductor come into contact with each other, and the current transformer may not function.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to provide a gas-insulated current transformer capable of preventing a connection portion between a coaxial terminal conductor and a coaxial reciprocating conductor from becoming large and simplifying the structure and reducing the cost. There is to do.
[0013]
Another object of the present invention is to provide a gas-insulated current transformer in which the assembly accuracy required for using a louver contact can be easily obtained.
[0014]
[Means for Solving the Problems]
The present invention relates to a container in which an opening is hermetically closed by an insulating spacer and an insulating gas is sealed inside, a current transformer body housed in the container, and an annular shape provided in a state of penetrating the insulating spacer A coaxial terminal conductor having an inner terminal conductor coaxially provided inside the outer terminal conductor, a hollow tubular outer connecting conductor connected to one end of the primary coil of the current transformer body, and the outer A coaxial reciprocating conductor having an inner connecting conductor that is coaxially disposed inside the connecting conductor and connected to the other end of the primary coil, the outer terminal conductor and the inner terminal conductor having the outer connecting conductor and the inner connecting conductor, respectively. The present invention relates to a gas-insulated current transformer connected to one end and the other end of the primary coil of the current transformer body.
[0015]
In the present invention, the outer terminal conductor and the inner terminal conductor constituting the coaxial terminal conductor are coaxially positioned by fitting through the sleeve-shaped first insulating member. Further, the outer connecting conductor and the inner connecting conductor of the coaxial reciprocating conductor are coaxially positioned by fitting through the sleeve-like second insulating member, and the female terminal is formed on one and the other of the inner terminal conductor and the inner connecting conductor, respectively. A contact part and a male contact part are provided, and the male contact part is brought into contact with the female contact part via the louver contact. Further, the outer terminal conductor and the outer connecting conductor are connected via an adapter conductor provided concentrically surrounding the female contact portion, and a sleeve-shaped second conductor interposed between the adapter conductor and the female contact portion. 3 insulation members are provided, and the female contact portion and the adapter conductor are concentrically positioned by the third insulation member.
[0016]
As described above, the outer terminal conductor and the inner terminal conductor constituting the coaxial terminal conductor are fitted via an insulator, and the outer connection conductor and the inner connection conductor constituting the coaxial reciprocating conductor are fitted via an insulator. In addition, when the adapter conductor and the female contact part are fitted together via an insulator, the central axis of these conductors can be matched by simply assembling the connection parts of the coaxial terminal conductor and the coaxial reciprocating conductor in a predetermined order. Therefore, the assembly can be facilitated and the cost can be reduced. In addition, since the central axes of the conductors constituting the coaxial terminal conductor and the coaxial reciprocating conductor can always coincide with each other, the gap between the contact portions is always managed to a size suitable for use of the louver contact to obtain a predetermined energization performance. be able to.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the structure of a gas-insulated current transformer according to the present invention. In FIG. 3 is a coaxial terminal conductor attached to the insulating spacer 2, 4 is a current transformer body housed in the container 1, and 5 is a coaxial connecting the coaxial terminal conductor 3 and the current transformer body. This is a reciprocating conductor, and SF ₆ gas 6 is sealed in the container 1 as an insulating gas at a predetermined pressure.
[0018]
The metal container 1 has a bottom portion 1b formed so that the outline shape of the longitudinal section thereof is substantially arcuate, and a mounting fitting 101 is welded to a portion near the bottom portion 1b. The mounting bracket 101 is bolted to a support base 8 fixed to the base plate 7, and the metal container 1 is supported by the support base 8 with its axis line directed in the vertical direction. A flange fitting 102 is welded to the opening at the upper end of the container 1, and an annular flange plate 103 is bolted to the flange fitting 102.
[0019]
The insulating spacer 2 is a well-known one formed in a cone shape from an insulating material such as an epoxy resin, and a flange portion 2 a formed on the outer periphery thereof is bolted to the flange plate 103.
[0020]
As shown in detail in FIG. 2, the coaxial terminal conductor 3 includes an annular outer terminal conductor 301 attached in a state where the central portion of the insulating spacer 2 is airtightly penetrated, and a coaxial inner side of the outer terminal conductor. And a cylindrical inner terminal conductor 302 arranged on the inner surface of the inner surface. The outer terminal conductor 301 and the inner terminal conductor 302 are tightly fitted (with a fitting structure) in an airtight manner with the sleeve-like first insulating member 9 interposed therebetween. A portion of the inner terminal conductor 302 located in the container 1 is formed in a tubular shape, and a female contact portion 302a is configured by the tubular portion. By reducing the outer diameter of the tip of the female contact portion 302a, a thin portion 302a1 is formed at the tip of the contact portion 302a. In order to facilitate the insertion of a male contact portion to be described later, a rounded portion is attached to the inner portion of the tip portion of the thin portion 302a1.
[0021]
The current transformer body 4 is wound around a primary coil 401 wound to have a predetermined number of turns (1 turn in the illustrated example) and an annular iron core provided so as to be linked to the primary coil 401. Secondary coil 402. The primary coil 401 and the secondary coil 402 are each covered with an electric field relaxation shield and fixed to the container 1 by appropriate means.
[0022]
Both ends of the primary coil 401 of the current transformer body 4 are connected to the coaxial terminal conductor 3 through a coaxial reciprocating conductor 5 provided so as to extend along the central axis of the container 1 between the current transformer body and the insulating spacer. ing.
[0023]
As shown in FIG. 2, the coaxial reciprocating conductor 5 includes a tubular outer connecting conductor 501 provided coaxially with the outer terminal conductor 301 (in a state where the axis is shared), and an inner side of the outer connecting conductor 501. The one end of the outer connection conductor 501 and one end of the inner connection conductor 502 are connected to one end and the other end of the primary coil 401, respectively. The outer connection conductor 501 and the inner connection conductor 502 are fitted through the second insulating member 10 formed in a sleeve shape and positioned so as to share the respective axes.
[0024]
At the other end of the inner connection conductor 502, a rod-shaped male contact portion 502a protruding from the other end of the outer connection conductor 501 toward the inner terminal conductor 302 is formed. On the outer periphery of the male contact portion 502a, a plurality of (three in the illustrated example) grooves are provided in the axial direction, and the louver contacts 11 are respectively attached to these grooves. As shown in FIG. 4, the louver contact 11 is formed such that a large number of slits are formed in a plate made of a metal having good conductivity such as copper and the edge portion of each slit is deformed so as to protrude from the plate surface. Thus, a plurality of louver-shaped contact portions 11a are formed into a ring shape, and the edge portion of each contact portion 11a comes into contact with the other contact portion.
[0025]
The male contact portion 502 a is inserted inside the female contact portion 302 a formed on the inner terminal conductor 302 of the coaxial terminal conductor 3 and is brought into contact with the female contact portion 302 a via the louver contact 11. .
[0026]
Further, a tubular adapter conductor 12 is provided so as to surround the female contact portion 302a coaxially, and flanges 12a and 12b provided at one end and the other end in the axial direction of the adapter conductor 12 are bolts 13 and 14, respectively. To the outer terminal conductor 301 and the outer connecting conductor 501. Enlarged diameter portions 12c and 12d are formed on the inner periphery of the end portion on the outer terminal conductor 301 side of the adapter conductor 12 and the inner periphery of the end portion on the outer connection conductor 501 side, respectively. A sleeve-like third insulating member 15 interposed between the adapter conductor and the female contact portion is fitted. A thin-walled portion 302a1 at the tip of the female contact portion 302a is fitted to the inner periphery of the insulating member 15, so that the female contact portion 302a and the adapter conductor 12 are positioned coaxially. An electric field relaxation shield 16 is attached so as to cover the connection portion between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5.
[0027]
FIG. 3 shows an example of how to assemble the connecting portion between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5. In this example, the adapter conductor 12 is first arranged so as to surround the female contact portion 302a coaxially, and the flange 12a at one end of the adapter conductor 12 is temporarily fixed to the outer terminal conductor 301 with a bolt. Next, the sleeve-like third insulating member 15 is fitted and fixed in the gap between the inner periphery of the enlarged diameter portion 12d of the adapter conductor 12 and the thin portion 302a1 at the tip of the female contact portion 302a. The male contact portion 502a at the tip of the coaxial reciprocating conductor 5 to which the louver contact 11 is attached is inserted into the female contact 302a, and the flange 12d of the adapter conductor 12 is bolted to the outer connection conductor 501. Thereafter, the shield 16 is attached, and the assembly of the connecting portion between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5 is completed.
[0028]
As described above, the outer connecting conductor 501, the inner connecting conductor 502, and the insulating member 10 interposed between the two conductors are coaxially positioned by the fitting structure, and the adapter conductor 12, the female contact portion 302a, the insulating member 15, Are coaxially positioned by the fitting structure, the assembly is carried out in a predetermined order, so that the respective central axes of the outer terminal conductor 301, the outer connecting conductor 501, the inner terminal conductor 302, and the inner connecting conductor 302 are aligned. Can be matched automatically. Accordingly, the louver contact 11 is formed between the female contact portion 302a formed at the distal end of the inner terminal conductor 302 and the male contact portion 502a formed at the distal end of the inner connection conductor 502 without particularly troublesome assembly work. Can be managed in a size suitable for use, and the cost required for assembly can be reduced.
[0029]
In addition, when the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor is configured using the female contact and the male contact having the fitting structure as described above and the louver contact interposed between the contacts, the tulip contact is used. Compared to the case, the structure can be simplified.
[0030]
In the above example, three louver contacts are provided, but the number of louver contacts can be increased or decreased according to the magnitude of the current that needs to flow to the primary side of the current transformer. According to the present invention, since the current capacity can be increased by increasing the number of louver contacts arranged side by side in the axial direction, without increasing the size of the connection between the coaxial terminal conductor and the coaxial reciprocating conductor, It is possible to cope with an increase in primary energization capacity.
[0031]
In the above example, the female contact portion 302 a is provided at the tip of the inner terminal conductor 302 and the male contact portion 502 a is provided at the tip of the inner connection conductor 501, but the male contact portion is provided at the tip of the inner terminal conductor 302. A female contact portion may be provided at the tip of the inner connecting conductor 502.
[0032]
【The invention's effect】
As described above, according to the present invention, the outer terminal conductor and the inner terminal conductor of the coaxial terminal conductor are fitted via an insulator, and the outer connection conductor and the inner connection conductor of the coaxial reciprocating conductor are fitted via an insulator. The adapter conductor and the female contact part are fitted together via an insulator, and the connection between the coaxial terminal conductor and the coaxial reciprocating conductor is assembled in a predetermined order. So that the gap between the male contact portion and the female contact portion can be managed to a size suitable for the use of the louver contact, facilitating assembly and reducing costs. be able to.
[0033]
Further, in the present invention, the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor is configured using the female contact and the male contact having a fitting structure, and the louver contact interposed between the contacts. Compared with the case of using, the structure of the connecting portion can be simplified and the size can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a configuration example of a gas-insulated current transformer according to the present invention.
FIG. 2 is an enlarged view of part A in FIG.
FIG. 3 is an assembly diagram for explaining an assembly order of the main part of FIG. 1;
4 is a perspective view showing an example of a louver contact used in the gas-insulated current transformer of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container 2 Insulation spacer 3 Coaxial terminal conductor 301 Outer terminal conductor 302 Inner terminal conductor 302a Female contact part 4 Current transformer main body 401 Primary coil 402 Secondary coil 5 Coaxial reciprocating conductor 501 Outer connection conductor 502 Inner connection conductor 502a Male contact 9 First insulating member 10 Second insulating member 11 Louver contact 12 Adapter conductor

Claims

A container in which an opening is hermetically closed by an insulating spacer and an insulating gas is enclosed therein, a current transformer body housed in the container, and an annular outer terminal provided in a state of passing through the insulating spacer A coaxial terminal conductor having an inner terminal conductor coaxially provided inside the conductor and the outer terminal conductor, a hollow tubular outer connecting conductor connected to one end of a primary coil of the current transformer body, and the outer connecting conductor A coaxial reciprocating conductor having an inner connecting conductor that is coaxially disposed inside and connected to the other end of the primary coil, wherein the outer terminal conductor and the inner terminal conductor have the outer connecting conductor and the inner connecting conductor, respectively. In the gas-insulated current transformer connected to one end and the other end of the primary coil of the current transformer body through
The outer terminal conductor and the inner terminal conductor are fitted through a sleeve-like first insulating member and positioned coaxially,
The outer connecting conductor and the inner connecting conductor are fitted through a sleeve-like second insulating member and positioned coaxially,
A female contact part and a male contact part are provided on one and the other of the inner terminal conductor and the inner connection conductor, respectively, and the male contact part is brought into contact with the female contact part via a louver contact,
The outer terminal conductor and the outer connecting conductor are connected via an adapter conductor provided so as to surround the female contact portion coaxially,
A sleeve-like third insulating member is provided so as to be interposed between the adapter conductor and the female contact portion, and the female contact portion and the adapter conductor are coaxially positioned by the third insulating member. A gas-insulated current transformer characterized by being made.