JP4526717B2

JP4526717B2 - Switchgear

Info

Publication number: JP4526717B2
Application number: JP2001035629A
Authority: JP
Inventors: 孝行糸谷; 稔小林; 聖一宮本; 俊文佐藤
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2001-02-13
Filing date: 2001-02-13
Publication date: 2010-08-18
Anticipated expiration: 2021-02-13
Also published as: JP2002245906A

Description

【０００１】
【発明の属する技術分野】
本発明は、母線側導体と負荷側導体とを接離する主回路開閉部と、負荷側導体と接地用導体とを接離する接地開閉部とを一体化した機能ユニットを備えるスイッチギヤに関する。
【０００２】
【従来の技術】
母線からの受電を、各種の負荷機器、他の電気室に配電すべく用いられるスイッチギヤ（閉鎖配電盤）は、母線との接続のための母線側導体、負荷への送電ケーブルとの接続のための負荷側導体等の接続導体と共に、母線側導体と負荷側導体とを接離する主回路開閉器、負荷側導体を接地するための接地開閉器、監視制御に必要な制御機器等の内部機器を、接地金属製の外箱内に適宜に配設して構成されている。
【０００３】
この種のスイッチギヤの一種として、特公平７−２８４８８号公報に開示されているように、主たる内部機器としての主回路開閉器及び接地開閉器を接続導体の一部と共に一体化して構成された機能ユニットを備え、この機能ユニットを外箱内に配置して、母線及び送電ケーブルとの接続のみを行えばよい構成としたスイッチギヤがある。
【０００４】
図５は上述の特公平７−２８４８８号公報に開示されたスイッチギヤの要部の構成を示す図であり、図６はその電気的接続図である。これらに示すスイッチギヤは、絶縁性ガスが封入され、その周壁の一部を内外に貫通する態様に送電ケーブル接続用のブッシング２ａと、母線接続用のブッシング２ｂ（図６参照）とを備える容器１の内部に第１、第２、第３の開閉器３、４、５及び真空消弧室９を配した構成となっている。
【０００５】
図６に示す如く、ブッシング２ｂを介して外部の母線（図示せず）に接続される三相の夫々に対応する母線側分岐導体６は、図５に示す如く絶縁支持碍子１１により支持されて絶縁容器１内に配設されており、これらは、真空消弧室９の内部に構成された図示しない開閉装置、及び第１の開閉器３を介して、絶縁支持碍子６０ａに固定支持された中間導体６０に接続され、該中間導体６０により２方向に分岐され、夫々の分岐は、第２、第３の開閉器４、５を介してブッシング２ａに支持された負荷側導体２に接続され、該負荷側導体２を経て外部の送電ケーブル（図示せず）に接続される。
【０００６】
開閉器３、４、５は、金属リンク８及び絶縁リンク７を介して伝達される図示しない格別の駆動源の動作に応じて夫々の枢軸回りに揺動する揺動電極を備えている。第１の開閉器３は、その揺動電極の揺動位置に応じて、真空消弧室９内部の開閉装置の出力電極と中間導体６０対応位置に突設された固定電極とを接続する閉路位置と、揺動電極と接地用導体１０ａとを接続する接地位置と、両位置の中間であり、中間導体６０の固定電極及び接地用導体１０ａから離れた断路位置とを実現する構成となっている。
【０００７】
また第２、第３の開閉器４、５は、夫々の揺動電極の揺動により、負荷側導体２と中間導体６０の対応位置に夫々突設された固定電極及び接地用導体１０ｂ、１０ｃとの間にて、第１の開閉器３と同様の３位置を実現する構成となっている。
【０００８】
以上の構成によれば、母線側分岐導体６と負荷側導体２とを接離する主回路開閉部と、負荷側導体２を接地するための接地開閉部とが、接地用の導体と共に容器１の内部に配設されており、母線側分岐導体６をブッシング２ｂを介して容器１外の母線に接続し、負荷側導体２をブッシング２ａを介して容器１外の送電ケーブルに接続すればよく、小型化されたスイッチギヤを提供することができる。
【０００９】
【発明が解決しようとする課題】
ところが以上の如き従来のスイッチギヤにおいて、真空消弧室９内部の開閉装置は当該回路を開閉する作用のみを行い、第１の開閉器３は他の回路との切離しの為の断路器と、開閉装置の出力電極を断路下にて接地する接地開閉器とを兼ね、更に第２、第３の開閉器４、５は夫々に対応する負荷側導体２を接地する接地開閉器としての機能を果たす構成であり、母線側分岐導体６と負荷側導体２との間に２つの開閉器（第１の開閉器３と、第２の開閉器４又は第３の開閉器５）が直列に配置されることから、これらの配置スペースを確保するために容器１の小型化が制限されるという問題があった。
【００１０】
また、容器１の内部には絶縁ガスが封入されており開閉器３、４、５においては、三相の相間、対地間、断路位置での各極間に封入ガスの種類に応じた絶縁距離を確保する必要があり、開閉器３、４、５の夫々が大型化する上、各開閉器３、４、５間に十分な離隔距離を保つために、容器１内の配設効率が悪く、該容器１の小型化が制限されるという問題があった。
【００１１】
また、真空消弧室９は、図１５に示す三相回路において単相毎に設けられることから、これらの配設位置の確保の為に容器１の小型化が制限され、また製品コストの上昇を招くという問題があった。
【００１２】
更には、容器１の内部においてアーク短絡が発生した場合、容器１内に封入された絶縁性ガスが、アークエネルギーにより短時間の内に、高温、高圧となる一種の爆発現象が引き起こされることから、前記容器１には、高圧の放圧のための開放部分を設ける必要がある上、放圧完了までの高圧状態に耐える強度が要求されることとなり、容器１の構造が複雑化し、製品コストの上昇を招くという問題があった。
【００１３】
本発明は斯かる事情に鑑みてなされたものであり、従来に比して大幅な小型化が可能であり、製品コストの低下を図れると共に、内部におけるアーク短絡事故の発生時にも爆発を引き起こすことがない安全性の高いスイッチギヤを提供することを目的とする。
【００１４】
【課題を解決するための手段】
（１）母線側端子と負荷側端子とを接離する主回路開閉部と、負荷側端子と接地用端子とを接離する接地開閉部とを、共通の真空容器内に設け、主回路開閉部可動側電極棒と接地開閉部固定側電極棒とを前記真空容器内で可とう性導体により電気的に接続してなるスイッチギヤにおいて、接地開閉部の対向電極において、両方もしくは片方の電極対向面の裏に金属製のブロックを接合して電極の熱容量を高めたことを特徴とするスイッチギヤ。
【００１５】
（２）前記ブロックは、そのざぐり側面部で電極側面部分に接合されたものである。
【００１６】
（３）前記可とう性導体を接地開閉部固定側電極棒に接続する為の取付け板と、接地開閉部電極裏に設けた前記ブロックとが一体である。
【００１７】
（４）前記接地開閉部電極周りに金属蒸気飛散を抑制するシールドと、接地開閉部電極裏に設けた前記ブロックとが一体である。
【００１８】
（５）可とう性導体周りに電界緩和のために設けたカバーと接地開閉部電極裏に設けた前記ブロックとが一体である。
【００１９】
【発明の実施の形態】
実施の形態１．
図１は、本発明に係るスイッチギヤの実施の形態１の要部の構成を示す正面断面図である。
【００２０】
この実施の形態は、金属製の真空容器２１内に主回路開閉部７１と接地開閉部７２を有している。主回路開閉部７１は、固定電極２６、可動電極２７で構成され、それぞれ固定電極棒３０、可動電極棒３１に固定されている。固定電極棒３０は、封着部材３９、絶縁物２２、封着部材４３を介して真空容器２１に固定され、真空容器２１と電気的に絶縁されている。可動電極棒３１は、絶縁ロッド７３を介して操作棒３５と接続されている。操作棒３５は、主回路開閉部７１を閉路位置、遮断位置、断路位置へ動作させるための図示してない駆動機構に接続される。さらに、操作棒３５はベローズ３４を介して封着部材４０に接続されている。封着部材４０は、絶縁物２３、封着部材４４を介して真空容器２１に接続されている。主回路開閉部７１は、ベローズ３４により気密を維持しながら動作可能となっている。絶縁ロッド７３は、絶縁物５３の両端にシールド５４が配された構成となっている。シールド５４は、絶縁物５３とシールド５４の接続境界部の電界緩和及び絶縁物５３の沿面保護、並びに主回路開閉部７１の電流開閉時に発生する金属蒸気から絶縁物５３及びベローズ３４を保護する目的を有している。
主回路開閉部７１の周りには、電流開閉時の金属蒸気飛散を抑制するためのアークシールド３７が設けられ、絶縁物２２の段部に係合して固定され、真空容器２１と電気的に絶縁されている。充電部となる封着部材とセラミックの接合部には、電界緩和の為のリング４７、４９、５０が設けられ、さらに絶縁物内面の金属蒸気による汚損を抑制する役目も担っている。
【００２１】
次に、接地開閉部７２は、固定電極２８、可動電極２９で構成され、それぞれ銅製ブロック６５と接合し、固定電極棒３２、可動電極棒３３に固定されている。固定電極棒３２は、封着部材４１、絶縁物２４、封着部材４５を介して真空容器２１に固定されている。可動電極棒３３は、ベローズ３６を介して封着部材４２に接続されている。封着部材４２は、絶縁物２５、封着部材４６を介して真空容器２１に接続されている。接地開閉部７２は、ベローズ３６により真空容器２１内の気密を維持しつつ動作可能となっている。充電部となる封着部材とセラミックの接合部には、電界緩和の為のリング４８、５１、５２が設けられ、さらに絶縁物内面の金属蒸気による汚損を抑制する役目も担っている。
【００２２】
主回路開閉部７１の可動電極棒３１と接地開閉部７２の固定電極棒３３間は、可とう性導体３８で電気的に接続されている。可とう性導体３８は、端部を取付け板６６により挟み込む構造であり、取付け板６６と各電極棒３１、３３はろう付け接合により固定している。主回路開閉部７１が閉極状態、接地開閉部７２が開極状態の場合は、主回路開閉部７１の固定電極棒３０と接地開閉部７２の固定電極棒３２との間を電流が流れることとなる。
【００２３】
接地開閉部７２は、短時間通電性能が必要である。通電により、電極同志が溶着し、これを引き外す性能が接地開閉部を動作させる操作装置に要求される。溶着引き外し力を減ずることにより操作装置を小形化する事が可能となる。よって、接地開閉部７２の固定電極２８及び可動電極２９には、対向面とは逆の面に銅製のブロック６５を接続することにより、熱容量を増加し、溶着引き外し力を減じている。また、接地電極は大電流遮断及び多回数の小電流遮断の必要がない為、熱容量をブロック６５により補って高価である電極材料費を減ずることができる。
【００２４】
以上の如く構成されたスイッチギヤにおいては、絶縁性能の良い真空中で主回路開閉部７１および接地開閉部７２が構成されているため、それぞれの間に必要な絶縁距離を減少させることでき、従来に比して大幅な小形化が図れる。更に、真空容器２１の内部にアーク短絡が発生した場合においても、真空容器２１の内部に気体が存在しないから、アーク短絡が爆発につながる虞れがなく、高い安全性が得られる。さらに、接地開閉部７２の溶着引き外し力が低減でき、接地開閉部を動作させる操作装置を簡単化でき装置全体として小形化が図れる。
【００２５】
実施の形態２．
図２は、本発明に係るスイッチギヤの実施の形態２の要部の構成を示す正面断面図である。
【００２６】
スイッチギヤの基本的構成は、接地開閉部７２を構成する固定および可動電極棒３２、３３が異なる以外は前述の実施の形態１のものと同様である。即ちこの実施形態に於いては、可とう性導体３８を接地開閉部側固定電極棒３２に接続する為の取付け板と銅製ブロックが一体製作あるいは接合され、部品点数削減を図ることができる。接地開閉部固定側電極２８に十分な熱容量を付加している為、可動側電極３３には先の実施形態のもののようなブロックを付加しない構成としている。可動側および固定側電極２８、２９は同じ肉厚とし、素材を共用化している。固定側電極２８の側面部をブロックとはめ合わせ構造とし、電極側面をろう付け接合することにより、熱拡散効果向上を図っている。電極用素材の中には、製造上ある程度の肉厚が必要なものがある為、無理に電極の薄肉化を行うより側面をブロックに接合した方が良い場合がある。
【００２７】
以上の如く構成されたスイッチギヤにおいては、絶縁性能の良い真空中で主回路開閉部７１、接地開閉部７２が構成されているため、それぞれの間に必要な絶縁距離を減少させることでき、従来のものに比して大幅な小形化が図れる。更に、真空容器２１の内部にアーク短絡が発生した場合においても、真空容器２１の内部に気体が存在しないから、アーク短絡が爆発につながる虞れがなく、高い安全性が得られる。さらに、部品点数を増やすことなく接地開閉部の溶着引き外し力が低減でき、接地開閉部を動作させる操作装置を簡単化でき装置全体として小形化が図れる。
【００２８】
実施の形態３．
図３は、本発明に係るスイッチギヤの実施の形態３の要部の構成を示す正面断面図である。
【００２９】
スイッチギヤの基本的構成は、接地開閉部７２を構成する固定および可動電極棒３２、３３が異なる以外は前述の実施の形態１のものと同様である。即ちこの実施形態に於いては、接地開閉部固定側電極２８の銅製ブロックと、接地電極周りを囲うように配置した金属蒸気遮蔽用のシールド６７が設けられている。シールド６７は図示の如くブロックと一体製作されたものでも良いし、別の部品として製作して接合したものでも良い。シールド６７は、短絡投入責務時に発孤現象で電極から飛散した金属蒸気が真空容器内部に付着して汚損するのを抑制し、絶縁低下を防ぐことができ、さらに、短時間通電により発生した熱の拡散効果も向上させることができる。
【００３０】
以上の如く構成されたスイッチギヤにおいては、絶縁性能の良い真空中で主回路開閉部７１、接地開閉部７２が構成されるため、それぞれの間に必要な絶縁距離を減少させることでき、従来に比して大幅な小形化が図れる。更に、真空容器２１の内部にアーク短絡が発生した場合においても、真空容器２１の内部に気体が存在しないから、前記アーク短絡が爆発につながる虞れがなく、高い安全性が得られる。さらに、接地開閉部の溶着引き外し力が低減でき、接地開閉部を動作させる操作装置を簡単化でき装置全体として小形化が図れる。また、接地開閉部に短絡投入責務をもつ開閉装置が構成可能となる。
【００３１】
実施の形態４．
図４は、本発明に係るスイッチギヤの実施の形態４の要部の構成を示す正面断面図である。
【００３２】
スイッチギヤの基本的構成は、接地開閉部７２を構成する固定および可動電極棒３２、３３が異なる以外は前述の実施の形態１のものと同様である。即ちこの実施形態に於いては、接地開閉部固定側電極２８の銅製ブロックと、可とう性導体３８を囲うように配置したカバー６８とが一体製作された構成である。可とう性導体３８が金属箔の積層体または網状のものとした場合には端部で、あるいはが矩形断面の場合には導体側面部で電界集中が起こり耐電圧性能低下を生じるので、その電界緩和の為に導電性のカバー６８を配置する。図示の例では、カバー６８は可とう性導体３８の側面部に於ける電界緩和を目的とするもので、可とう性導体３８の少なくとも一部を囲むように折り曲げられた板状のもので、カバーから一体に延びた部分がブロックと６５となって固定電極３２に結合されている。このようなカバー６８により幅方向の真空中絶縁距離を縮小可能となり、装置の小形化が実現できる。また、短時間通電により電極で発生した熱が可とう性導体の方向へも拡散できるため、溶着力低減効果が増加する。
【００３３】
以上の如く構成されたスイッチギヤにおいては、絶縁性能の良い真空中に主回路開閉部７１、接地開閉部７２が構成されているため、それぞれの間に必要な絶縁距離を減少させることでき、従来に比して大幅な小形化が図れる。更に、真空容器２１の内部にアーク短絡が発生した場合においても、真空容器２１の内部に気体が存在しないから、前記アーク短絡が爆発につながる虞れがなく、高い安全性が得られる。さらに、接地開閉部の溶着引き外し力が低減でき、接地開閉部を動作させる操作装置を簡単化でき装置全体として小形化が図れる。また、可とう性導体周りに配置したカバーの電界緩和効果により、小形化及び絶縁の信頼性向上が図れる。
【００３４】
以上の説明の如く、この発明のスイッチギヤは、母線側端子と負荷側端子とを接離する主回路開閉部７１と、負荷側端子と接地用端子とを接離する接地開閉部７２とを、真空容器２１内で構成したスイッチギヤであって、主回路開閉部７１の接離可能な固定電極３２と可動電極３１は、それぞれ固定電極棒３２と可動電極棒３３先端に設けられている。固定電極棒には封着部材３９が固定され主回路開閉部７１固定側を形成している。可動電極棒３１は、絶縁物５３を介して操作棒に接続される。操作棒と封着部材はベローズ３４によって接続され主回路開閉部可動側を形成し、真空を保ちつつ接離可能な構造となっている。接地開閉部７２の接離可能な固定電極２８と可動電極２９は、それぞれ固定電極棒３２と可動電極棒３３先端に設けられている。固定電極棒３２には封着部材４１が固定され接地開閉部固定側を形成している。可動電極棒３３はベローズ３６を介して封着部材４２に接続され接地開閉部可動側を形成し、真空を保ちつつ接離可能な構造となっている。主回路開閉部７１の電極周りには金属蒸気飛散を抑制する為のアークシールド３７が設けられ、真空容器１に固定されている。主回路開閉部可動側電極棒３１と接地開閉部固定側電極棒３０は、真空容器１内で可とう性導体３８により電気的に接続されている。真空容器１は金属で製作され、前述の主回路開閉部固定側と可動側、並びに接地開閉部固定側と可動側はそれぞれ絶縁物を介して真空容器に固定され、真空容器と電気的に絶縁されている。接地開閉部７２の対向電極２８、２９において、両方もしくは片方の電極対向面の裏に電極より大なる径の銅製ブロック６５を配置し、電極２８、２９とブロック６５とを接合してある。
【００３５】
また、ブロック６５は、そのざぐり側面部を電極側面部分に接合して取り付けることができ、可とう性導体３８を接地開閉部固定側電極棒に接続するための取付け板６６と接地開閉部電極裏に配置する銅製ブロック６５とを一体に製作することもでき、接地開閉部電極周りに金属蒸気飛散を抑制するシールド６７と接地開閉部電極裏に配置する銅製ブロック６５とを一体に製作することもでき、可とう性導体３８周りに電界緩和のために配置するカバー６８と接地開閉部電極裏に配置する銅製ブロック６５とを一体に製作することもできる。
【００３６】
【発明の効果】
（１）以上詳述した如く、本発明に係るスイッチギヤにおいては、母線側端子と負荷側端子とを接離する主回路開閉部と、負荷側端子と接地用端子とを接離する接地開閉部とを共通の真空容器内に設け、主回路開閉部可動側電極棒と接地開閉部固定側電極棒とを前記真空容器内で可とう性導体により電気的に接続してなるスイッチギヤにおいて、接地開閉部の対向電極において、両方もしくは片方の電極対向面の裏に金属製のブロックを接合して電極の熱容量を高めたものであるので、真空絶縁による小形化が可能であるとともに、接地開閉部の溶着引き外し力が低減でき、操作装置部の小形化が可能であり、更に、容器内部でのアーク短絡の発生が爆発を引起こす虞がなく、安全性を高めることができる。
【００３７】
（２）前記ブロックは、そのざぐり側面部で電極側面部分に接合されたものであるので、接地開閉部の溶着引き外し力が低減でき、操作装置部の小形化が可能であり、更に、容器内部でのアーク短絡の発生が爆発を引起こす虞がなく、安全性を高めることができる。
【００３８】
（３）前記可とう性導体を接地開閉部固定側電極棒に接続する為の取付け板と、接地開閉部電極裏に設けた前記ブロックとが一体であるので、接地開閉部の溶着引き外し力が低減でき、操作装置部の小形化が可能であり、更に、容器内部でのアーク短絡の発生が爆発を引起こす虞がなく、安全性を高めることができる。
【００３９】
（４）前記接地開閉部電極周りに金属蒸気飛散を抑制するシールドと、接地開閉部電極裏に設けた前記ブロックとが一体であるので、接地開閉部の溶着引き外し力が低減でき、操作装置部の小形化が可能であり、更に、容器内部でのアーク短絡の発生が爆発を引起こす虞がなく、安全性を高めることができる。
【００４０】
（５）可とう性導体周りに電界緩和のために設けたカバーと接地開閉部電極裏に設けた前記ブロックとが一体であるので、接地開閉部の溶着引き外し力が低減でき、操作装置部の小形化が可能であり、更に、容器内部でのアーク短絡の発生が爆発を引起こす虞がなく、安全性を高めることができる。
【図面の簡単な説明】
【図１】本発明に係るスイッチギヤの実施の形態１の要部の構成を示す正面断面図である。
【図２】本発明に係るスイッチギヤの実施の形態２の要部の構成を示す正面断面図である。
【図３】本発明に係るスイッチギヤの実施の形態３の要部の構成を示す正面断面図である。
【図４】本発明に係るスイッチギヤの実施の形態４の要部の構成を示す正面断面図である。
【図５】従来のスイッチギヤの要部の構成を示す図である。
【図６】従来のスイッチギヤの電気的接続図である。
【符号の説明】
１容器、２負荷側導体、２ａブッシング、２ｂブッシング、９消弧室、１０ａ接地用導体、１０ｂ接地用導体、１０ｃ接地用導体、２６主回路開閉部の固定電極、２７主回路開閉部の可動電極、２８接地開閉部の固定電極、２９接地開閉部の可動電極、３０主回路開閉部の固定電極棒、３１主回路開閉部の可動電極棒、３２接地開閉部の固定電極棒、３３接地開閉部の可動電極棒、３８可とう性導体、６５ブロック、６６取付け板、６７
シールド、６８カバー、７１主回路開閉部、７２接地開閉部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch gear including a functional unit in which a main circuit opening / closing portion that contacts and separates a bus-side conductor and a load-side conductor and a ground opening / closing portion that contacts and separates a load-side conductor and a grounding conductor are integrated.
[0002]
[Prior art]
Switch gears (closed switchboards) used to distribute power received from the busbars to various load devices and other electrical rooms are for connecting the busbar side conductors for connection to the busbars and the power transmission cable to the load Internal devices such as main circuit switches that connect and disconnect the bus-side conductors and load-side conductors together with connecting conductors such as load-side conductors, ground switches for grounding the load-side conductors, and control devices required for monitoring and control Are appropriately arranged in an outer box made of ground metal.
[0003]
As a kind of this type of switchgear, as disclosed in Japanese Patent Publication No. 7-28488, a main circuit switch and a ground switch as main internal devices are integrated with a part of a connection conductor. There is a switchgear that includes a functional unit, which is configured to be disposed in an outer box and only connected to a bus and a power transmission cable.
[0004]
FIG. 5 is a diagram showing a configuration of a main part of the switchgear disclosed in the above-mentioned Japanese Patent Publication No. 7-28488, and FIG. 6 is an electrical connection diagram thereof. The switchgear shown here is a container that is provided with a bushing 2a for connecting a power transmission cable and a bushing 2b for connecting a busbar (see FIG. 6) in such a manner that an insulating gas is enclosed and a part of its peripheral wall penetrates inside and outside. 1 has first, second and third switches 3, 4, 5 and a vacuum arc extinguishing chamber 9 arranged therein.
[0005]
As shown in FIG. 6, the bus-side branch conductors 6 corresponding to each of the three phases connected to the external bus (not shown) via the bushing 2b are supported by the insulating support insulator 11 as shown in FIG. These are disposed in the insulating container 1, and these are fixedly supported by the insulating support insulator 60 a via a switch (not shown) configured inside the vacuum arc extinguishing chamber 9 and the first switch 3. Connected to the intermediate conductor 60 and branched in two directions by the intermediate conductor 60. Each branch is connected to the load-side conductor 2 supported by the bushing 2a via the second and third switches 4 and 5. The load side conductor 2 is connected to an external power transmission cable (not shown).
[0006]
The switches 3, 4, and 5 are provided with oscillating electrodes that oscillate around their respective pivots according to the operation of a special drive source (not shown) that is transmitted through the metal link 8 and the insulating link 7. The first switch 3 is a closed circuit that connects the output electrode of the switchgear inside the vacuum arc extinguishing chamber 9 and the fixed electrode protruding from the position corresponding to the intermediate conductor 60 according to the swing position of the swing electrode. The position, the ground position for connecting the swing electrode and the grounding conductor 10a, and the disconnection position that is intermediate between the fixed position of the intermediate conductor 60 and the grounding conductor 10a are realized. Yes.
[0007]
In addition, the second and third switches 4 and 5 are fixed electrodes and grounding conductors 10b and 10c respectively protruding from the corresponding positions of the load side conductor 2 and the intermediate conductor 60 by the swing of the swing electrodes. Between the two, the same three positions as the first switch 3 are realized.
[0008]
According to the above configuration, the main circuit opening / closing part for connecting / separating the bus-side branch conductor 6 and the load-side conductor 2 and the ground opening / closing part for grounding the load-side conductor 2 together with the grounding conductor 1 The bus-side branch conductor 6 may be connected to the bus outside the container 1 via the bushing 2b, and the load-side conductor 2 may be connected to the power transmission cable outside the container 1 via the bushing 2a. Thus, a miniaturized switchgear can be provided.
[0009]
[Problems to be solved by the invention]
However, in the conventional switchgear as described above, the switchgear inside the vacuum arc extinguishing chamber 9 performs only the action of opening and closing the circuit, and the first switch 3 is a disconnector for disconnecting from other circuits, The second and third switches 4 and 5 also function as a ground switch that grounds the corresponding load-side conductor 2. The second and third switches 4 and 5 also serve as a ground switch that grounds the output electrode of the switch. Two switches (the first switch 3 and the second switch 4 or the third switch 5) are arranged in series between the bus-side branching conductor 6 and the load-side conductor 2. Therefore, there is a problem that the size reduction of the container 1 is restricted in order to secure these arrangement spaces.
[0010]
In addition, an insulating gas is sealed inside the container 1. In the switches 3, 4, and 5, an insulating distance corresponding to the type of the sealed gas between the three-phase phases, between the ground, and between the poles at the disconnection position. In addition, the size of each of the switches 3, 4, and 5 is increased, and a sufficient separation distance is maintained between the switches 3, 4, and 5. There has been a problem that miniaturization of the container 1 is limited.
[0011]
Further, since the vacuum arc extinguishing chamber 9 is provided for each single phase in the three-phase circuit shown in FIG. 15, the miniaturization of the container 1 is restricted to secure the arrangement position thereof, and the product cost increases. There was a problem of inviting.
[0012]
Furthermore, when an arc short circuit occurs inside the container 1, the insulating gas enclosed in the container 1 causes a kind of explosion phenomenon that becomes high temperature and high pressure within a short time due to arc energy. In addition, the container 1 needs to be provided with an open portion for releasing the high pressure, and is required to have a strength that can withstand the high pressure state until the pressure is released, which complicates the structure of the container 1 and reduces the product cost. There was a problem of inviting a rise.
[0013]
The present invention has been made in view of such circumstances, and can be significantly reduced in size as compared with the prior art, and can reduce the product cost and cause an explosion even when an arc short-circuit accident occurs inside. An object of the present invention is to provide a highly safe switchgear that does not have any.
[0014]
[Means for Solving the Problems]
(1) A main circuit opening / closing part for connecting / separating the bus-side terminal and the load-side terminal and a ground opening / closing part for contacting / separating the load-side terminal and the grounding terminal are provided in a common vacuum vessel, and the main circuit opening / closing is provided. In a switchgear in which the movable electrode bar on the movable part and the fixed electrode bar on the ground opening / closing part are electrically connected to each other by a flexible conductor in the vacuum vessel, A switchgear characterized by joining a metal block to the back of the surface to increase the heat capacity of the electrode.
[0015]
(2) The block is joined to the electrode side surface portion at the counterbore side surface portion.
[0016]
(3) A mounting plate for connecting the flexible conductor to the ground opening / closing portion fixed side electrode rod and the block provided on the back of the ground opening / closing portion electrode are integrated.
[0017]
(4) A shield that suppresses metal vapor scattering around the ground opening / closing part electrode and the block provided behind the ground opening / closing part electrode are integrated.
[0018]
(5) The cover provided for relaxing the electric field around the flexible conductor and the block provided on the back of the ground switch electrode are integrated.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a front sectional view showing a configuration of a main part of a switchgear according to Embodiment 1 of the present invention.
[0020]
This embodiment has a main circuit opening / closing part 71 and a ground opening / closing part 72 in a metal vacuum vessel 21. The main circuit opening / closing part 71 includes a fixed electrode 26 and a movable electrode 27, and is fixed to the fixed electrode bar 30 and the movable electrode bar 31, respectively. The fixed electrode rod 30 is fixed to the vacuum vessel 21 via the sealing member 39, the insulator 22, and the sealing member 43, and is electrically insulated from the vacuum vessel 21. The movable electrode bar 31 is connected to the operation bar 35 via an insulating rod 73. The operation bar 35 is connected to a drive mechanism (not shown) for operating the main circuit opening / closing part 71 to a closed position, a closed position, and a disconnected position. Further, the operation bar 35 is connected to the sealing member 40 via the bellows 34. The sealing member 40 is connected to the vacuum container 21 via the insulator 23 and the sealing member 44. The main circuit opening / closing part 71 is operable by the bellows 34 while maintaining airtightness. The insulating rod 73 has a configuration in which shields 54 are disposed at both ends of the insulator 53. The shield 54 is used for the purpose of protecting the insulator 53 and the bellows 34 from the metal vapor generated at the time of opening and closing the current of the main circuit switching unit 71 and the electric field relaxation at the boundary between the insulator 53 and the shield 54 and the creeping protection of the insulator 53. have.
Around the main circuit opening / closing part 71, an arc shield 37 for suppressing metal vapor scattering at the time of current opening / closing is provided. The arc shield 37 is engaged with and fixed to the stepped part of the insulator 22, and is electrically connected to the vacuum vessel 21. Insulated. Rings 47, 49, and 50 for relaxing the electric field are provided at the joining portion of the sealing member and the ceramic serving as the charging portion, and also play a role of suppressing contamination of the insulator inner surface by metal vapor.
[0021]
Next, the ground opening / closing part 72 is composed of the fixed electrode 28 and the movable electrode 29, joined to the copper block 65, and fixed to the fixed electrode bar 32 and the movable electrode bar 33. The fixed electrode rod 32 is fixed to the vacuum vessel 21 via a sealing member 41, an insulator 24, and a sealing member 45. The movable electrode rod 33 is connected to the sealing member 42 via the bellows 36. The sealing member 42 is connected to the vacuum vessel 21 through the insulator 25 and the sealing member 46. The ground opening / closing part 72 is operable while the airtightness in the vacuum vessel 21 is maintained by the bellows 36. Rings 48, 51, and 52 for relaxing the electric field are provided at the joint between the sealing member and the ceramic serving as the charging part, and also play a role of suppressing contamination of the inner surface of the insulator by metal vapor.
[0022]
The movable electrode bar 31 of the main circuit opening / closing part 71 and the fixed electrode bar 33 of the ground opening / closing part 72 are electrically connected by a flexible conductor 38. The flexible conductor 38 has a structure in which an end portion is sandwiched between the mounting plates 66, and the mounting plate 66 and the electrode rods 31 and 33 are fixed by brazing. When the main circuit switching unit 71 is closed and the ground switching unit 72 is opened, current flows between the fixed electrode bar 30 of the main circuit switching unit 71 and the fixed electrode bar 32 of the ground switching unit 72. It becomes.
[0023]
The ground opening / closing part 72 needs a short-time energization performance. An operation device that operates the grounding opening / closing section is required to have the ability to weld the electrodes together and remove the electrodes when energized. It is possible to reduce the size of the operating device by reducing the welding pull-off force. Therefore, by connecting the copper block 65 to the fixed electrode 28 and the movable electrode 29 of the ground opening / closing part 72 on the surface opposite to the opposing surface, the heat capacity is increased and the welding removal force is reduced. In addition, since the ground electrode does not require large current interruption and many small current interruptions, the heat capacity can be supplemented by the block 65, and the cost of expensive electrode material can be reduced.
[0024]
In the switchgear configured as described above, since the main circuit switching unit 71 and the ground switching unit 72 are configured in a vacuum with good insulation performance, the necessary insulation distance can be reduced between them. The size can be greatly reduced compared to. Furthermore, even when an arc short circuit occurs inside the vacuum vessel 21, no gas is present inside the vacuum vessel 21, so there is no possibility of the arc short circuit leading to an explosion, and high safety is obtained. Further, the welding pull-off force of the ground opening / closing portion 72 can be reduced, the operating device for operating the ground opening / closing portion can be simplified, and the overall size of the device can be reduced.
[0025]
Embodiment 2. FIG.
FIG. 2 is a front sectional view showing a configuration of a main part of the switchgear according to the second embodiment of the present invention.
[0026]
The basic configuration of the switch gear is the same as that of the first embodiment described above except that the fixed and movable electrode rods 32 and 33 constituting the ground opening / closing part 72 are different. That is, in this embodiment, the mounting plate and the copper block for connecting the flexible conductor 38 to the ground opening / closing portion side fixed electrode rod 32 are integrally manufactured or joined, and the number of parts can be reduced. Since a sufficient heat capacity is added to the ground opening / closing part fixed side electrode 28, the movable side electrode 33 is configured such that no block is added as in the previous embodiment. The movable side and fixed side electrodes 28 and 29 have the same thickness and share the material. The side surface portion of the fixed side electrode 28 is fitted to the block, and the electrode side surface is brazed and joined to improve the thermal diffusion effect. Since some electrode materials require a certain thickness for manufacturing, it may be better to join the side surfaces to the block rather than forcibly reducing the thickness of the electrode.
[0027]
In the switchgear configured as described above, since the main circuit switching unit 71 and the ground switching unit 72 are configured in a vacuum with good insulation performance, the necessary insulation distance between them can be reduced. The size can be greatly reduced compared to those. Furthermore, even when an arc short circuit occurs inside the vacuum vessel 21, no gas is present inside the vacuum vessel 21, so there is no possibility of the arc short circuit leading to an explosion, and high safety is obtained. Furthermore, the welding pull-out force of the ground opening / closing part can be reduced without increasing the number of parts, the operating device for operating the ground opening / closing part can be simplified, and the overall size of the apparatus can be reduced.
[0028]
Embodiment 3 FIG.
FIG. 3 is a front sectional view showing a configuration of a main part of the switchgear according to the third embodiment of the present invention.
[0029]
The basic configuration of the switch gear is the same as that of the first embodiment described above except that the fixed and movable electrode rods 32 and 33 constituting the ground opening / closing part 72 are different. That is, in this embodiment, a copper block of the ground opening / closing part fixed side electrode 28 and a shield 67 for shielding metal vapor disposed so as to surround the ground electrode are provided. The shield 67 may be manufactured integrally with the block as shown, or may be manufactured and joined as a separate part. The shield 67 suppresses the metal vapor scattered from the electrode due to a solitary phenomenon during the short circuit charging duty from adhering to the inside of the vacuum vessel and fouling, and prevents a decrease in insulation. The diffusion effect of can also be improved.
[0030]
In the switchgear configured as described above, since the main circuit switching unit 71 and the ground switching unit 72 are configured in a vacuum with good insulation performance, the necessary insulation distance between them can be reduced. Compared to this, the size can be greatly reduced. Furthermore, even when an arc short circuit occurs inside the vacuum vessel 21, no gas is present inside the vacuum vessel 21, so there is no possibility that the arc short circuit will lead to an explosion, and high safety is obtained. Further, the welding pull-off force of the ground opening / closing part can be reduced, the operating device for operating the ground opening / closing part can be simplified, and the overall size of the apparatus can be reduced. In addition, it is possible to configure a switchgear having a short circuit charging duty in the ground switchgear.
[0031]
Embodiment 4 FIG.
FIG. 4 is a front sectional view showing a configuration of a main part of a switchgear according to a fourth embodiment of the present invention.
[0032]
The basic configuration of the switch gear is the same as that of the first embodiment described above except that the fixed and movable electrode rods 32 and 33 constituting the ground opening / closing part 72 are different. That is, in this embodiment, the copper block of the ground opening / closing portion fixing side electrode 28 and the cover 68 arranged so as to surround the flexible conductor 38 are integrally manufactured. When the flexible conductor 38 is made of a metal foil laminate or a net-like structure, electric field concentration occurs at the end portion or, when the cross section is rectangular, at the side surface portion of the conductor, resulting in a decrease in withstand voltage performance. A conductive cover 68 is disposed for relaxation. In the illustrated example, the cover 68 is for the purpose of relaxing the electric field at the side surface of the flexible conductor 38, and is a plate-like one bent so as to surround at least a part of the flexible conductor 38. A portion extending integrally from the cover is a block and 65 and is coupled to the fixed electrode 32. Such a cover 68 makes it possible to reduce the insulation distance in the vacuum in the width direction, thereby realizing downsizing of the apparatus. In addition, since the heat generated at the electrode due to short-time energization can diffuse in the direction of the flexible conductor, the effect of reducing the welding force is increased.
[0033]
In the switchgear configured as described above, since the main circuit switching unit 71 and the ground switching unit 72 are configured in a vacuum with good insulation performance, the necessary insulation distance between them can be reduced. The size can be greatly reduced compared to. Furthermore, even when an arc short circuit occurs inside the vacuum vessel 21, no gas is present inside the vacuum vessel 21, so there is no possibility that the arc short circuit will lead to an explosion, and high safety is obtained. Further, the welding pull-off force of the ground opening / closing part can be reduced, the operating device for operating the ground opening / closing part can be simplified, and the overall size of the apparatus can be reduced. In addition, due to the electric field relaxation effect of the cover disposed around the flexible conductor, it is possible to reduce the size and improve the insulation reliability.
[0034]
As described above, the switchgear according to the present invention includes the main circuit opening / closing part 71 that contacts and separates the bus-side terminal and the load-side terminal, and the ground opening-and-closing part 72 that contacts and separates the load-side terminal and the grounding terminal. The fixed gear 32 and the movable electrode 31, which are switch gears configured in the vacuum chamber 21 and can be contacted and separated from the main circuit opening / closing portion 71, are provided at the tips of the fixed electrode rod 32 and the movable electrode rod 33, respectively. A sealing member 39 is fixed to the fixed electrode rod to form a fixed side of the main circuit opening / closing part 71. The movable electrode bar 31 is connected to the operation bar via an insulator 53. The operation rod and the sealing member are connected by a bellows 34 to form a main circuit opening / closing portion movable side, and are configured to be able to contact and separate while maintaining a vacuum. The fixed electrode 28 and the movable electrode 29 that can be brought into and out of contact with the ground opening / closing part 72 are provided at the tips of the fixed electrode bar 32 and the movable electrode bar 33, respectively. A sealing member 41 is fixed to the fixed electrode rod 32 to form a ground opening / closing portion fixing side. The movable electrode bar 33 is connected to the sealing member 42 via the bellows 36 to form the ground opening / closing part movable side, and has a structure that can be contacted and separated while maintaining a vacuum. An arc shield 37 for suppressing metal vapor scattering is provided around the electrode of the main circuit opening / closing portion 71 and is fixed to the vacuum vessel 1. The main circuit opening / closing portion movable side electrode rod 31 and the ground opening / closing portion fixed side electrode rod 30 are electrically connected within the vacuum vessel 1 by a flexible conductor 38. The vacuum vessel 1 is made of metal, and the main circuit opening / closing portion fixed side and the movable side, and the ground opening / closing portion fixed side and the movable side are fixed to the vacuum vessel via insulators, and are electrically insulated from the vacuum vessel. Has been. In the counter electrodes 28 and 29 of the ground opening / closing portion 72, a copper block 65 having a diameter larger than the electrode is disposed behind both or one of the electrode facing surfaces, and the electrodes 28 and 29 and the block 65 are joined.
[0035]
Further, the block 65 can be attached by bonding the counterbore side surface portion to the electrode side surface portion, and the mounting plate 66 for connecting the flexible conductor 38 to the ground opening / closing portion fixing side electrode rod and the ground opening / closing portion electrode back surface. The copper block 65 disposed on the ground opening / closing portion electrode can be integrally manufactured, and the shield 67 for suppressing metal vapor scattering around the ground opening / closing portion electrode and the copper block 65 disposed behind the ground opening / closing portion electrode can be integrally manufactured. In addition, the cover 68 arranged for relaxing the electric field around the flexible conductor 38 and the copper block 65 arranged on the back of the ground opening / closing part electrode can be integrally manufactured.
[0036]
【The invention's effect】
(1) As described in detail above, in the switchgear according to the present invention, the main circuit opening / closing portion that contacts / separates the bus-side terminal and the load-side terminal, and the ground opening / closing that contacts / separates the load-side terminal and the grounding terminal In a common vacuum vessel, and in a switch gear formed by electrically connecting the main circuit opening / closing part movable side electrode rod and the ground opening / closing portion fixed side electrode rod by a flexible conductor in the vacuum vessel, In the counter electrode of the ground opening / closing part, a metal block is joined to the back of both or one of the electrode facing surfaces to increase the heat capacity of the electrode. It is possible to reduce the welding pull-out force of the part, and to reduce the size of the operating device part, and further, there is no possibility that the occurrence of an arc short circuit inside the container will cause an explosion, and the safety can be improved.
[0037]
(2) Since the block is joined to the electrode side surface portion at the counterbore side surface portion, the welding pull-out force of the ground opening / closing portion can be reduced, and the operation device portion can be reduced in size. There is no risk of an arc short circuit inside causing an explosion, and safety can be improved.
[0038]
(3) Since the mounting plate for connecting the flexible conductor to the ground opening / closing part fixed side electrode rod and the block provided on the back of the ground opening / closing part electrode are integral, the welding pull-off force of the ground opening / closing part Therefore, it is possible to reduce the size of the operating device part, and further, there is no possibility that the occurrence of an arc short circuit inside the container will cause an explosion, thereby improving safety.
[0039]
(4) Since the shield for suppressing metal vapor scattering around the ground opening / closing portion electrode and the block provided on the back of the ground opening / closing portion electrode are integrated, the welding / detaching force of the ground opening / closing portion can be reduced, and the operating device It is possible to reduce the size of the portion, and further, there is no possibility that the occurrence of an arc short circuit inside the container will cause an explosion, and safety can be improved.
[0040]
(5) Since the cover provided for relaxing the electric field around the flexible conductor and the block provided on the back of the ground opening / closing part electrode are integral, the welding / detaching force of the ground opening / closing part can be reduced, and the operating device part In addition, there is no risk of an arc short circuit inside the container causing an explosion, and safety can be improved.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a configuration of a main part of a switchgear according to a first embodiment of the present invention.
FIG. 2 is a front sectional view showing a configuration of a main part of a switchgear according to a second embodiment of the present invention.
FIG. 3 is a front sectional view showing a configuration of a main part of a switchgear according to a third embodiment of the present invention.
FIG. 4 is a front sectional view showing a configuration of a main part of a switchgear according to a fourth embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a main part of a conventional switch gear.
FIG. 6 is an electrical connection diagram of a conventional switchgear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container, 2 Load side conductor, 2a bushing, 2b bushing, 9 Arc-extinguishing chamber, 10a Grounding conductor, 10b Grounding conductor, 10c Grounding conductor, 26 Fixed electrode of main circuit switching part, 27 Movable main circuit switching part Electrode, 28 Fixed electrode for ground switching unit, 29 Movable electrode for ground switching unit, 30 Fixed electrode rod for main circuit switching unit, 31 Movable electrode rod for main circuit switching unit, 32 Fixed electrode rod for ground switching unit, 33 Ground switching Movable electrode bar, 38 flexible conductor, 65 blocks, 66 mounting plate, 67
Shield, 68 Cover, 71 Main circuit switching part, 72 Ground switching part.

Claims

母線側端子と負荷側端子とを接離する主回路開閉部と、負荷側端子と接地用端子とを接離する接地開閉部とを、共通の真空容器内に設け、主回路開閉部可動側電極棒と接地開閉部固定側電極棒とを前記真空容器内で可とう性導体により電気的に接続してなるスイッチギヤにおいて、接地開閉部の対向電極において、両方もしくは片方の電極対向面の裏に金属製のブロックを接合して電極の熱容量を高めたことを特徴とするスイッチギヤ。A main circuit opening / closing part that connects / disconnects the bus terminal and load side terminal and a ground opening / closing part that contacts / separates the load side terminal and grounding terminal are provided in a common vacuum vessel, and the main circuit opening / closing part movable side In a switchgear in which an electrode rod and a grounding opening / closing portion fixed-side electrode rod are electrically connected by a flexible conductor in the vacuum vessel, the opposite electrode of the grounding opening / closing portion has a back surface of both or one of the electrode facing surfaces. A switchgear characterized in that a metal block is joined to the electrode to increase the heat capacity of the electrode.

前記ブロックは、そのざぐり側面部で電極側面部分に接合されたことを特徴とする請求項１記載のスイッチギヤ。2. The switchgear according to claim 1, wherein the block is joined to an electrode side surface portion at a counterbore side surface portion.

前記可とう性導体を接地開閉部固定側電極棒に接続する為の取付け板と、接地開閉部電極裏に設けた前記ブロックとが一体であることを特徴とする請求項１あるいは２記載のスイッチギヤ。3. The switch according to claim 1, wherein a mounting plate for connecting the flexible conductor to a grounding opening / closing part fixed side electrode rod and the block provided on the back of the grounding opening / closing part electrode are integrated. gear.

前記接地開閉部電極周りに金属蒸気飛散を抑制するシールドと、接地開閉部電極裏に設けた前記ブロックとが一体であることを特徴とする請求項１乃至３のいずれか記載のスイッチギヤ。The switchgear according to any one of claims 1 to 3, wherein a shield for suppressing metal vapor scattering around the ground opening / closing part electrode and the block provided on the back of the ground opening / closing part electrode are integrated.

可とう性導体周りに電界緩和のために設けたカバーと接地開閉部電極裏に設けた前記ブロックとが一体であることを特徴とする請求項１乃至４のいずれか記載のスイッチギヤ。The switchgear according to any one of claims 1 to 4, wherein a cover provided for relaxing the electric field around the flexible conductor and the block provided on the back of the ground opening / closing part electrode are integrated.