JP3753553B2

JP3753553B2 - Switchgear

Info

Publication number: JP3753553B2
Application number: JP10458099A
Authority: JP
Inventors: 孝行糸谷; 稔正丸山; 俊文佐藤; 聖一宮本; 稔小林
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1999-04-12
Filing date: 1999-04-12
Publication date: 2006-03-08
Anticipated expiration: 2019-04-12
Also published as: JP2000294090A

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】
母線から受電した電力を各種の負荷機器、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、及び監視制御に必要な制御機器等の機器を接地された金属製のハウジング内に配設して構成されている。
【０００３】
このようなスイッチギヤのひとつとして、特公平７−２８４８８号公報に開示されているように、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なえばよい構成としたスイッチギヤがある。
【０００４】
図１３はこのスイッチギヤの要部の構成を示す平面断面図、図１４はその電気的接続図である。図１３に示すように、このスイッチギヤは、絶縁性ガスが封入されている金属製の容器１の周壁の一部を内外に貫通する送電ケーブル接続用のブッシング２ａと、同じく周壁の一部を内外に貫通する母線接続用のブッシング２ｂとを備えており、該容器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】
ブッシング２ｂを介して外部の母線（図示せず）に接続された母線側分岐導体６は、容器１の周壁の一部に固着された絶縁支持碍子１１により支持されて容器１内に配設されており、これは真空消弧室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、容器１の周壁の一部に固着された絶縁支持碍子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、各々の分岐は第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）に接続されている。
【０００６】
図１３には１相分の回路しか示していないが、図１４に示す如く、このスイッチギヤは３相の回路構成となっており、前記ブッシング２ａ，２ｂ、前記第１の開閉器３、前記第２の開閉器４、及び前記第３の開閉器５は何れも各相１組ずつ備えられている。
【０００７】
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各別の操作機構の動作に応じて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、閉路位置と接地位置と断路位置とを実現する構成となっている。前記閉路位置は、真空消弧室９内部の開閉装置の出力電極と前記中間導体６０の対応位置に突設された固定電極とを接続する位置であり、前記接地位置は、前記揺動電極と接地用導体１０ａとを接続する位置であり、また前記断路位置は、両位置の中間であり、前記固定電極及び接地用導体１０ａから離れた位置となっている。
【０００８】
また第２，第３の開閉器４，５は、各々の揺動電極の揺動により、負荷側導体２と中間導体６０の対応位置に各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。
【０００９】
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、接続用の導体と共に容器１の内部に配設されているから、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い。
【００１０】
【発明が解決しようとする課題】
以上の如き従来のスイッチギヤでは、容器１は接地されているため、第１，第２，第３の開閉器３，４，５の各充電部と容器１との電位差が大きくなり、地絡が発生しやすいという問題があった。
【００１１】
また、母線側分岐導体６と負荷側導体２との間に、第１及び第２の開閉器３，４、または第１及び第３の開閉器３，５の２つの開閉器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。
【００１２】
また、容器１の内部には絶縁性ガスが封入されており、前記開閉器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前記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、このため前記開閉器３，４，５の夫々が大型化し、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の小型化が制限されるという問題があった。
【００１３】
また、真空消弧室９は、三相回路の各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、また製品コストが上昇するという問題があった。
【００１４】
また、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、高圧となる爆発現象が引き起こされることから、前記容器１には、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、製品コストが上昇するという問題があった。
【００１５】
本発明は斯かる事情に鑑みてなされたものであり、真空容器を接地電位から離隔させることによって、地絡の発生を低減したスイッチギヤを提供することを目的とする。
【００１６】
また、本発明の他の目的は、主回路開閉部及び接地開閉部を１つの真空容器に収納することによって、従来に比して大幅な小型化が可能なスイッチギヤを提供することにある。
【００１７】
また、本発明の他の目的は、その構成を単純なものとすることによって、従来に比して製品コストを低減したスイッチギヤを提供することにある。
【００１８】
また、本発明の他の目的は、真空中に主回路開閉部及び接地開閉部を構成することによって、容器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スイッチギヤを提供することにある。
【００１９】
【課題を解決するための手段】
第１発明に係るスイッチギヤは、母線側導体または負荷側導体の一方に繋がる固定電極及び他方に繋がる可動電極を接離する主回路開閉部と、前記負荷側導体または接地用導体の一方に繋がる固定電極及び他方に繋がる可動電極を接離する接地開閉部とを収納し、外部の接地電位から電気的に絶縁されて前記主回路開閉部及び接地開閉部の充電部電位と前記接地電位との中間電位に保たれた真空容器を備えることを特徴とする。
【００２０】
第１発明に係るスイッチギヤによれば、真空容器を接地電位から電気的に絶縁するため、真空容器の電位は、開閉器の充電部の電位及び接地電位の間の電位となる。従って、前記充電部と真空容器との間、及び真空容器と接地電位との間の夫々の電位差は大きくならず、地絡の発生を低減することが可能となる。
【００２１】
また、絶縁性能が高い真空中に主回路開閉部及び接地開閉部を収納するため、夫々の間に必要な絶縁距離を減ずることができ、従来と比して大幅に小型化することが可能となる。
【００２２】
また、真空容器内でアーク短絡が発生した場合、真空容器の内部に気体が存在しないため、アーク短絡から爆発が発生する虞がない。
【００２３】
第２発明に係るスイッチギヤは、主回路開閉部及び接地開閉部を夫々動作させる２つの操作部を備え、該２つの操作部が真空容器外周面に並列的に付設されていることを特徴とする。
【００２４】
第２発明に係るスイッチギヤによれば、主回路開閉部及び接地開閉部の操作部を隣接配置するため、両者の駆動機構のインターロックを簡略化することが可能となる。
【００２５】
第３発明に係るスイッチギヤは、主回路開閉部の一対の電極が、主回路開閉部固定側と真空容器とを電気的に絶縁する為の絶縁物の内部に配置されていることを特徴とする。
【００２６】
第３発明に係るスイッチギヤによれば、主回路開閉部の一対の電極を、主回路開閉部固定側と真空容器とを絶縁する絶縁物内に収納するため、耐電圧性能を向上させることが可能となり、また、絶縁物の大きさを大きくする一方、真空容器を小さくすることができ、このため製品コストを低減することが可能となる。
【００２７】
第４発明に係るスイッチギヤは、主回路開閉部の電極周りに配されるアークシールドが、真空容器と電気的に絶縁されていることを特徴とする。
【００２８】
第４発明に係るスイッチギヤによれば、真空容器及びアークシールドが電気的に絶縁されているため、主回路開閉部の電極からアークシールドへ放電が発生したときに真空容器の電圧が上昇せず、耐電圧性能を一層向上させることが可能となる。
【００２９】
第５発明に係るスイッチギヤは、主回路開閉部の負荷側電極に接続され、電界緩和の為に金属製のシールドを具備する絶縁ロッドと、主回路開閉部及び接地開閉部の夫々の負荷側電極を電気的に接続し、主回路開閉部側の固定部が前記絶縁ロッドの外径寸法より大なる寸法とされている可撓性導体を備えることを特徴とする。
【００３０】
第５発明に係るスイッチギヤによれば、可撓性導体の主回路開閉部側の固定部が、絶縁ロッドの外径より大きいため、絶縁ロッドのシールド端部の電界集中を緩和し、主回路開閉部からの金属蒸気が絶縁ロッドに付着することを防止することが可能となる。
【００３１】
第６発明に係るスイッチギヤは、主回路開閉部の絶縁ロッドが、主回路開閉部可動側と真空容器とを電気的に絶縁する為の絶縁物内部に配置され、接地開閉部の一対の電極が、接地開閉部の可動側と真空容器とを電気的に絶縁する為の絶縁物内部に配置されたことを特徴とする。
【００３２】
第６発明に係るスイッチギヤによれば、絶縁ロッド及び接地開閉部の一対の電極が夫々絶縁物内部に配置されるため、耐電圧性能を一層向上させることが可能となる。
【００３３】
第７発明に係るスイッチギヤは、主回路開閉部及び接地開閉部の夫々の負荷側電極を電気的に接続する可撓性導体の途中に接離可能な一対の電極を設けたことを特徴とする。
【００３４】
第７発明に係るスイッチギヤによれば、主回路開閉部だけでなく、可撓性導体の途中に設けた一対の電極によっても、母線側と負荷側とを接離することができるため、耐電圧性能を一層向上させることが可能となる。
【００３５】
【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、図２は、同じく上面図、図３は、同じく側面図である。
【００３６】
図において、１０は金属製の真空容器である。該真空容器１０内には、主回路開閉部２０及び接地開閉部３０が収納されている。主回路開閉部２０は母線に繋がる固定電極棒２１の先端の固定電極２１ａと、可動電極棒２２の先端の可動電極２２ａとからなっている。前記固定電極棒２１は封着部材４１ａ、絶縁物５１、及び封着部材４１ｂを介して真空容器１０に固定され、真空容器１０と電気的に絶縁されている。一方、前記可動電極棒２２は、長手方向に絶縁ロッド２３を介して操作棒２４と接続されており、操作棒２４は、主回路開閉部２０を閉路位置、遮断位置、断路位置へ動作させる為の操作部６１に接続されている。また、操作棒２４はベローズ７１、封着部材４２ａ、絶縁物５２、封着部材４２ｂを介して真空容器１０に接続され、真空容器１０と電気的に絶縁されており、真空容器１０内の気密を維持しつつ動作可能となっている。
【００３７】
絶縁ロッド２３は円柱形の絶縁物２３ａの両端部の外周面に夫々縦断面視略Ｕ字型の円環状をなす金属製のシールド２３ｂ，２３ｂが配された構成であり、該シールド２３ｂは前記絶縁物２３ａとの接続境界部の電界緩和、絶縁物２３ａの沿面保護、及び主回路開閉部２０の電流開閉時に発生する金属蒸気から絶縁物２３ａ及び前記ベローズ７１を保護する為に設けられている。
【００３８】
主回路開閉部２０の周囲には、電流開閉時の金属蒸気飛散を抑制する為に円筒状のアークシールド２６が設けられ、真空容器１０に固定されている。また、封着部材４１ａ及び絶縁物５１、絶縁物５１及び封着部材４１ｂ、絶縁物５２及び封着部材４２ｂの夫々の境界付近に、電界を緩和し、また絶縁物５１，５２の内面の金属蒸気による汚損を抑制する為にリング５１ａ，５１ｂ，５２ａが夫々設けられている。
【００３９】
一方、接地開閉部３０は、前記固定電極棒２１及び可動電極棒２２と並行に配設された固定電極棒３１及び可動電極棒３２の夫々の先端の固定電極３１ａ及び可動電極３２ａからなっている。真空容器１０の内部において、固定電極棒３１は主回路開閉部２０の可動電極２２ａ側に、可動電極棒３２は主回路開閉部２０の固定電極２１ａ側に夫々配設されている。固定電極棒３１は、封着部材４３ａ、絶縁物５３、及び封着部材４３ｂを介して真空容器１０に固定されており、真空容器１０と電気的に絶縁されている。一方、前記可動電極棒３２は、接地開閉部３０を開閉動作させる為の操作部６２に接続されている。また、可動電極棒３２はベローズ７２、封着部材４４ａ、絶縁物５４、封着部材４４ｂを介して真空容器１０に接続され、真空容器１０と電気的に絶縁されており、真空容器１０内の気密を維持しつつ動作可能となっている。
【００４０】
封着部材４３ａ及び絶縁物５３、絶縁物５３及び封着部材４３ｂ、絶縁物５４及び封着部材４４ｂの夫々の境界付近に、電界を緩和し、また絶縁物５３，５４の内面の金属蒸気による汚損を抑制する為にリング５３ａ，５３ｂ，５４ａが夫々設けられている。
【００４１】
主回路開閉部２０の可動電極棒２２と接地開閉部３０の固定電極棒３１間は、変形可能な可撓性導体８０で電気的に接続されている。主回路開閉部２０が閉極状態、接地開閉部３０が開極状態の場合は、主回路開閉部２０の固定電極棒２１と接地開閉部３０の固定電極棒３１との間を電流が流れることとなる。
【００４２】
以上の如く構成されたスイッチギヤにおいては、真空容器１０が接地されていないため、真空容器１０の電位は、主回路開閉部２０及び接地開閉部３０の充電部の電位と、真空容器１０の外部の接地電位との間の電位となり、真空容器１０と前記充電部との間、及び真空容器１０と前記接地電位との間の各電位差は大きくならず、地絡の発生を低減することができる。
【００４３】
また、絶縁性能が高い真空中で主回路開閉部２０、接地開閉部３０が構成されるため、夫々の部品間に必要な絶縁距離を減ずることができ、従来に比して大幅な小形化が可能となる。
【００４４】
また、真空容器１０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１０の内部に気体が存在しないから、前記アーク短絡から爆発が発生する虞れがない。
【００４５】
実施の形態２
図４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、図５は、同じく上面図、図６は、同じく側面図である。
【００４６】
主回路開閉部２０及び接地開閉部３０を夫々動作させるための操作部６１，６２は、真空容器１０の外周に並列的に付設されており、操作棒２４及び可動電極棒３２は、真空容器１０内部で同一側に並行して配されており、真空容器１０の同一面から外側へ突出し、並設された操作部６１，６２に夫々接続されている。一方、これらと対向して、主回路開閉部２０の固定電極棒２１及び接地開閉部３０の固定電極棒３１が並行して配されており、可動電極棒３２及び操作棒２４が突出している面と対向する面から真空容器１０の外部へ突出している。その他、実施の形態１と同様の部分については同符号を付し、説明を省略する。
【００４７】
以上の如く構成されたスイッチギヤにおいては、主回路開閉部２０及び接地開閉部３０の夫々の操作部６１，６２が隣接配置できるため、操作部６１，６２の駆動機構間のインターロックを簡略化することができる。
【００４８】
実施の形態３
図７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、図８は、同じく側面図である。
【００４９】
リング５１ｂを除き、主回路開閉部２０の電極２１ａ，２２ａ及びアークシールド２６が絶縁物５１の内部に配されており、アークシールド２６が、絶縁物５１と封着部材４１ｂの接合部付近の電界緩和も兼ねた構造となっている。その他、実施の形態２と同様の部分については同符号を付し、説明を省略する。
【００５０】
以上の如く構成されたスイッチギヤにおいては、主回路開閉部２０の電極２１ａ，２２ａを絶縁物５１内で収納する為、真空容器１０の小形化が図れる。真空容器１０をプレス加工によって成形する場合には、絞り深さが減少し、真空容器１０の製造コストを低減することができる。
【００５１】
実施の形態４
図９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。
【００５２】
主回路開閉部２０の電極２１ａ，２２ａの周囲に配されているアークシールド２６を支持する支持体を、アークシールド２６の外周面に設け、これを絶縁物５１の中央部に係合してアークシールド２６を固定し、アークシールド２６を真空容器１０から電気的に絶縁した構成となっている。その他、実施の形態３と同様の部分については同符号を付し、説明を省略する。
【００５３】
以上の如く構成されたスイッチギヤにおいては、アークシールド２６と真空容器１０が電気的に絶縁されているため、主回路開閉部２０の電極２１ａ，２２ａからアークシールド２６へ放電が発生した場合であっても、真空容器１０が高電位にならず、耐電圧性能が向上する。
【００５４】
なお、絶縁物５１を２つの部品から構成し、アークシールド２６を挟み込んで固定しても良い。
【００５５】
実施の形態５
図１０は、本発明に係るスイッチギヤの実施の形態５の要部の構成を示す正面断面図である。
【００５６】
主回路開閉部２０と接地開閉部３０とを電気的に接続する可撓性導体８０は、２対の導体板８１ａ，８１ｂで可撓性導体８０の板状の両端部を夫々狭持し、ネジ８１ｃによって固定されている。導体板８１ａ，８１ｂは可動電極棒２２及び固定電極棒３１の夫々に固定されており、これによって主回路開閉部２０及び接地開閉部３０に接続してある。また、この導体板８１ａ，８１ｂは絶縁ロッド２３の外径寸法より大きくなっており、絶縁ロッド２３のシールド２３ｂの端部の電界集中を緩和すると共に、主回路開閉部２０の遮断時の金属蒸気が絶縁ロッド２３の絶縁物２３ａ沿面へ付着することを抑制する。その他、実施の形態３と同様の部分については同符号を付し、説明を省略する。
【００５７】
以上の如く構成されたスイッチギヤにおいては、導体板８１ａ，８１ｂを用いることにより、可撓性導体８０の接続が容易になり、組立て作業性が向上する。また、絶縁ロッド２３のシールド２３ｂ端部の電界緩和、及び主回路開閉部２０の遮断時の金属蒸気が絶縁ロッド２３の絶縁物２３ａの沿面に付着することを抑制できるため、耐電圧性能が向上する。
【００５８】
なお、導体板８１ａ，８１ｂの一方に強度補強目的として抵抗の大きな金属板を用いてもよい。
【００５９】
実施の形態６
図１１は、本発明に係るスイッチギヤの実施の形態６の要部の構成を示す正面断面図である。
【００６０】
主回路開閉部２０の絶縁ロッド２３は、絶縁物５２の内部に配されている。また、接地開閉部３０の電極３１ａ，３２ａは絶縁物５４の内部に配されている。その他、実施の形態３と同様の部分については同符号を付し、説明を省略する。
【００６１】
以上の如く構成されたスイッチギヤにおいては、投入、遮断、断路状態の真空容器１０の内部で、接地電位と充電部とが対向している絶縁ロッド２３及び接地開閉部３０が、夫々絶縁物５２，５４内に配置されている為、地絡の発生を減少することができ、耐電圧性能が向上する。
【００６２】
実施の形態７
図１２は、本発明に係るスイッチギヤの実施の形態７の要部の構成を示す正面断面図である。
【００６３】
主回路開閉部２０及び接地開閉部３０の間に、可動電極９２ａ及び固定電極９１ａからなる開閉部９０を設けている。可動電極９２ａは可動電極棒９２の先端である。可動電極棒９２の他端には絶縁物９３ａ及びシールド９３ｂ，９３ｂからなる絶縁ロッド９３を介して操作棒９４が接続されている。操作棒９４は、該開閉部９０を開閉動作させる為の操作部６３に接続されている。また、操作棒９４はベローズ７３、封着部材４５ａ、絶縁物５５、封着部材４５ｂを介して真空容器１０に接続され、真空容器１０と電気的に絶縁されており、真空容器１０内の気密を維持しつつ動作可能となっている。また、主回路開閉部２０の可動電極棒２２及び開閉部９０の可動電極棒９２の間は、可撓性導体８０ａで電気的に接続されている。
【００６４】
一方、固定電極９１ａは固定電極棒９１の先端である。固定電極棒９１の他端は絶縁物９５ａ及びシールド９５ｂ，９５ｂからなる絶縁支え９５を介して真空容器１０に固定されており、真空容器１０と電気的に絶縁されている。また、開閉部９０の固定電極棒９１及び接地開閉部３０の固定電極棒３１の間は、導体８０ｂで電気的に接続されている。その他、実施の形態３と同様の部分については同符号を付し、説明を省略する。
【００６５】
以上の如く構成されたスイッチギヤにおいては、断路、接地時に主回路開閉部２０の電極２１ａ，２２ａ間に加え、開閉部９０の電極９１ａ，９２ａ間を開くことによって、耐電圧性能を高めることができる。
【００６６】
【発明の効果】
以上詳述した如く、第１発明に係るスイッチギヤによれば、真空容器が外部の接地電位から電気的に絶縁されて接地されていないため、該真空容器の電位は、主回路開閉部及び接地開閉部の各充電部の電位と前記接地電位との間の電位となり、真空容器と前記充電部との間、及び真空容器と前記接地電位との間の各電位差は大きくならず、従って、従来に比して地絡の発生を低減することが可能となる。
【００６７】
また、絶縁性能が高い真空容器内に主回路開閉部、接地開閉部が収納されるため、夫々の部品間に必要な絶縁距離を減ずることができ、従来に比して大幅に小形化することが可能となる。
【００６８】
また、真空容器の内部にアーク短絡が発生した場合においても、真空容器の内部に気体が存在しないから、前記アーク短絡からの爆発を防止することが可能となる。
【００６９】
第２発明に係るスイッチギヤによれば、主回路開閉部と接地開閉部の操作部を隣接配置することができるため、操作部の駆動機構間のインターロックを簡略化でき、製品コストを減少することが可能となる。
【００７０】
第３発明に係るスイッチギヤによれば、主回路開閉部の１対の電極を絶縁物内で収納するため、耐電圧性能を向上させることが可能となり、また、絶縁物の大きさを大きくする一方、真空容器を小さくすることが可能となる。真空容器をプレス加工によって成形する場合には、絞り深さが減少し、真空容器の製造コストを低減することが可能となる。
【００７１】
第４発明に係るスイッチギヤによれば、アークシールドと真空容器が電気的に絶縁されているため、主回路開閉部の１対の電極からアークシールドへ放電が発生した場合であっても、真空容器が高電位にならず、耐電圧性能を向上させることが可能となる。
【００７２】
第５発明に係るスイッチギヤによれば、可撓性導体の主回路開閉部の可動電極側の固定部が、絶縁ロッドの外径より大きいため、絶縁ロッドのシールド端部の電界集中を緩和し、主回路開閉部からの金属蒸気が絶縁ロッドに付着することを防止することが可能となる。
【００７３】
第６発明に係るスイッチギヤによれば、絶縁ロッド及び接地開閉部の一対の電極が夫々絶縁物内部に配置されるため、耐電圧性能を一層向上させることが可能となる。
【００７４】
第７発明に係るスイッチギヤによれば、主回路開閉部だけでなく、可撓性導体の途中に設けた一対の電極によっても、母線側と負荷側とを接離することができるため、耐電圧性能を一層向上させることが可能となる等本発明は優れた効果を奏する。
【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１の要部の構成を示す上面図である。
【図３】本発明に係るスイッチギヤの実施の形態１の要部の構成を示す側面図である。
【図４】本発明に係るスイッチギヤの実施の形態２の要部の構成を示す正面断面図である。
【図５】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上面図である。
【図６】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側面図である。
【図７】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８】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側面図である。
【図９】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１０】本発明に係るスイッチギヤの実施の形態５の要部の構成を示す正面断面図である。
【図１１】本発明に係るスイッチギヤの実施の形態６の要部の構成を示す正面断面図である。
【図１２】本発明に係るスイッチギヤの実施の形態７の要部の構成を示す正面断面図である。
【図１３】従来のスイッチギヤの要部の構成を示す平面断面図である。
【図１４】従来のスイッチギヤの電気的接続図である。
【符号の説明】
１０真空容器、２０主回路開閉部、２１固定電極棒、２１ａ固定電極、２２可動電極棒、２２ａ可動電極、２３絶縁ロッド、２３ａ絶縁物、２３ｂシールド、２４操作棒、２６アークシールド、３０接地開閉部、３１固定電極棒、３１ａ固定電極、３２可動電極棒、３２ａ可動電極、４１ａ〜４４ａ，４１ｂ〜４４ｂ封着部材、５１〜５５絶縁物、５１ａ〜５４ａ，５１ｂ，５３ｂリング、６１〜６３操作部、７１，７２ベローズ、８０可撓性導体、８１ａ，８１ｂ導体板、９１ａ固定電極、９２ａ可動電極。[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]
The switchgear used to distribute the power received from the busbars to various load devices and other electrical rooms consists of a busbar conductor for connection to the busbar and a loadside conductor for connection to the power transmission cable to the load. The main circuit switch that connects and disconnects the bus-side conductor and the load-side conductor, the ground switch for grounding the load-side conductor, and the control equipment necessary for monitoring and control are grounded together with the connecting conductor such as It is arranged in a metal housing.
[0003]
As one of such switchgears, as disclosed in Japanese Patent Publication No. 7-28488, the main circuit switch and the ground switch are provided with a functional unit configured integrally with a part of the connection conductor, There is a switchgear in which this functional unit is arranged in a box and only needs to be connected to the bus and the power transmission cable.
[0004]
FIG. 13 is a plan sectional view showing the configuration of the main part of the switchgear, and FIG. 14 is an electrical connection diagram thereof. As shown in FIG. 13, this switchgear includes a bushing 2a for connecting a power transmission cable that penetrates a part of the peripheral wall of a metal container 1 in which an insulating gas is sealed, and a part of the peripheral wall. And a bushing 2b for connecting a busbar penetrating inside and outside, and a configuration in which first, second and third switches 3, 4, 5 and a vacuum arc extinguishing chamber 9 are arranged inside the container 1. It has become.
[0005]
A bus-side branch conductor 6 connected to an external bus (not shown) via a bushing 2b is supported by an insulating support insulator 11 fixed to a part of the peripheral wall of the container 1 and disposed in the container 1. This is fixedly supported on an insulating support insulator 60a fixed to a part of the peripheral wall of the container 1 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. And connected to an external power transmission cable (not shown) through the load-side conductor 2.
[0006]
Although only a circuit for one phase is shown in FIG. 13, this switchgear has a three-phase circuit configuration as shown in FIG. 14, and the bushings 2a, 2b, the first switch 3, Each of the second switch 4 and the third switch 5 is provided with one set for each phase.
[0007]
The switches 3, 4, and 5 are provided with swing electrodes that swing according to the operation of each other operation mechanism (not shown) transmitted through the metal link 8 and the insulating link 7. The first switch 3 is configured to realize a closed position, a grounding position, and a disconnected position according to the swing position of the swing electrode. The closed position is a position where the output electrode of the switchgear inside the vacuum arc extinguishing chamber 9 is connected to the fixed electrode protruding from the corresponding position of the intermediate conductor 60, and the grounding position is the position of the swing electrode It is a position where the grounding conductor 10a is connected, and the disconnecting position is in the middle of both positions, and is a position away from the fixed electrode and the grounding conductor 10a.
[0008]
The second and third switches 4 and 5 are fixed electrodes and grounding conductors 10b and 10c respectively protruding from corresponding positions of the load-side conductor 2 and the intermediate conductor 60 by swinging of the swing electrodes. Between the two, the same three positions as the first switch 3 are realized.
[0009]
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 connection conductor 1 Since the bus-side branch conductor 6 is connected to the bus outside the container 1 via the bushing 2b, and the load-side conductor 2 is connected to the power transmission cable outside the container 1 via the bushing 2a. Good.
[0010]
[Problems to be solved by the invention]
In the conventional switchgear as described above, since the container 1 is grounded, the potential difference between the charged parts of the first, second and third switches 3, 4 and 5 and the container 1 becomes large, and a ground fault occurs. There was a problem that was likely to occur.
[0011]
Further, between the bus-side branching conductor 6 and the load-side conductor 2, the first and second switches 3 and 4 or the first and third switches 3 and 5 are arranged in series. Therefore, there is a problem that the size reduction of the container 1 is restricted in order to secure these arrangement spaces.
[0012]
Further, an insulating gas is sealed inside the container 1, and in the switches 3, 4, and 5, the type of the sealed gas is set between the three phases, between the ground, and between the poles at the disconnection position. In order to maintain a sufficient separation distance between the switches 3, 4, and 5, each of the switches 3, 4, and 5 is increased in size. There was a problem that the conversion was limited.
[0013]
Moreover, since the vacuum arc-extinguishing chamber 9 is provided for each phase of the three-phase circuit, there is a problem that the miniaturization of the container 1 is restricted to secure the arrangement position thereof, and the product cost increases. there were.
[0014]
Further, when an arc short circuit occurs inside the container 1, the insulating gas sealed in the container 1 causes an explosion phenomenon that becomes high temperature and high pressure within a short time due to the arc energy. 1 is required to provide an open part for releasing pressure, and is required to have a strength that can withstand a high pressure state until the releasing pressure is completed, which complicates the structure of the container 1 and increases the product cost. was there.
[0015]
This invention is made | formed in view of such a situation, and it aims at providing the switchgear which reduced generation | occurrence | production of a ground fault by separating a vacuum vessel from ground potential.
[0016]
Another object of the present invention is to provide a switchgear that can be significantly reduced in size as compared with the prior art by housing the main circuit switching unit and the ground switching unit in one vacuum vessel.
[0017]
Another object of the present invention is to provide a switchgear having a reduced product cost compared to the prior art by simplifying the configuration.
[0018]
Another object of the present invention is to provide a switchgear that does not cause an explosion even when an arc short-circuit accident occurs inside the container by configuring the main circuit switching unit and the ground switching unit in a vacuum. is there.
[0019]
[Means for Solving the Problems]
The switchgear according to the first aspect of the invention is connected to one of the load side conductor and the grounding conductor, and a main circuit opening / closing portion that contacts and separates the fixed electrode connected to one of the bus side conductor or the load side conductor and the movable electrode connected to the other. A stationary electrode and a ground opening / closing portion that contacts and separates a movable electrode connected to the other, Outside Electrically isolated from ground potential Maintained at an intermediate potential between the charged potential of the main circuit switching unit and the ground switching unit and the ground potential. A vacuum vessel is provided.
[0020]
According to the switchgear according to the first invention, since the vacuum vessel is electrically insulated from the ground potential, the potential of the vacuum vessel is a potential between the potential of the charging part of the switch and the ground potential. Therefore, the potential difference between the charging unit and the vacuum container and between the vacuum container and the ground potential is not increased, and the occurrence of a ground fault can be reduced.
[0021]
In addition, since the main circuit switching unit and ground switching unit are housed in a vacuum with high insulation performance, the necessary insulation distance can be reduced between them, and it is possible to significantly reduce the size compared to the conventional one. Become.
[0022]
In addition, when an arc short circuit occurs in the vacuum vessel, no gas is present inside the vacuum vessel, so there is no risk of explosion from the arc short circuit.
[0023]
The switchgear according to the second aspect of the invention is characterized in that it includes two operation parts for operating the main circuit opening / closing part and the ground opening / closing part, respectively, and the two operation parts are attached in parallel to the outer peripheral surface of the vacuum vessel. To do.
[0024]
According to the switchgear according to the second aspect of the present invention, since the operation parts of the main circuit opening / closing part and the ground opening / closing part are arranged adjacent to each other, it is possible to simplify the interlock of the drive mechanisms of both.
[0025]
The switchgear according to the third invention is characterized in that the pair of electrodes of the main circuit opening / closing portion is disposed inside an insulator for electrically insulating the main circuit opening / closing portion fixing side and the vacuum vessel. To do.
[0026]
According to the switchgear according to the third aspect of the invention, the pair of electrodes of the main circuit opening / closing portion is housed in the insulator that insulates the main circuit opening / closing portion fixing side and the vacuum vessel, so that the withstand voltage performance can be improved. In addition, the size of the insulator can be increased, while the vacuum container can be reduced, and thus the product cost can be reduced.
[0027]
The switchgear according to the fourth invention is characterized in that an arc shield disposed around the electrodes of the main circuit opening / closing portion is electrically insulated from the vacuum vessel.
[0028]
According to the switchgear according to the fourth aspect of the invention, since the vacuum vessel and the arc shield are electrically insulated, the voltage of the vacuum vessel does not increase when a discharge occurs from the electrode of the main circuit opening / closing portion to the arc shield. The withstand voltage performance can be further improved.
[0029]
A switchgear according to a fifth aspect of the invention is an insulating rod having a metal shield for electric field relaxation, and a load side of each of the main circuit switching unit and the ground switching unit connected to the load side electrode of the main circuit switching unit. The electrode is electrically connected, and the fixing part on the main circuit opening / closing part side includes a flexible conductor having a size larger than the outer diameter of the insulating rod.
[0030]
According to the switchgear according to the fifth aspect of the invention, since the fixing portion of the flexible conductor on the main circuit opening / closing portion side is larger than the outer diameter of the insulating rod, the electric field concentration at the shield end of the insulating rod is alleviated, and the main circuit It becomes possible to prevent the metal vapor from the opening / closing part from adhering to the insulating rod.
[0031]
In the switchgear according to the sixth aspect of the invention, the insulating rod of the main circuit opening / closing part is disposed inside the insulator for electrically insulating the main circuit opening / closing part movable side and the vacuum vessel, and a pair of electrodes of the ground opening / closing part Is arranged inside an insulator for electrically insulating the movable side of the ground opening / closing part and the vacuum vessel.
[0032]
According to the switchgear according to the sixth aspect of the present invention, since the pair of electrodes of the insulating rod and the ground opening / closing part are respectively disposed inside the insulator, it is possible to further improve the withstand voltage performance.
[0033]
According to a seventh aspect of the present invention, there is provided a switchgear characterized in that a pair of electrodes that can be contacted and separated are provided in the middle of a flexible conductor that electrically connects the load side electrodes of the main circuit switching unit and the ground switching unit. To do.
[0034]
According to the switchgear according to the seventh invention, the bus side and the load side can be contacted and separated not only by the main circuit opening / closing part but also by a pair of electrodes provided in the middle of the flexible conductor. The voltage performance can be further improved.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
FIG. 1 is a front sectional view showing a configuration of a main part of the first embodiment of the switchgear according to the present invention, FIG. 2 is a top view, and FIG. 3 is a side view.
[0036]
In the figure, 10 is a metal vacuum vessel. A main circuit opening / closing part 20 and a ground opening / closing part 30 are accommodated in the vacuum vessel 10. The main circuit opening / closing part 20 includes a fixed electrode 21 a at the tip of a fixed electrode bar 21 connected to the bus bar and a movable electrode 22 a at the tip of the movable electrode bar 22. The fixed electrode rod 21 is fixed to the vacuum vessel 10 via a sealing member 41a, an insulator 51, and a sealing member 41b, and is electrically insulated from the vacuum vessel 10. On the other hand, the movable electrode rod 22 is connected to an operation rod 24 through an insulating rod 23 in the longitudinal direction. The operation rod 24 moves the main circuit opening / closing portion 20 to a closed position, an interrupted position, and a disconnected position. The operation unit 61 is connected. Further, the operation rod 24 is connected to the vacuum vessel 10 through the bellows 71, the sealing member 42a, the insulator 52, and the sealing member 42b, and is electrically insulated from the vacuum vessel 10. It is possible to operate while maintaining.
[0037]
The insulating rod 23 has a configuration in which metal shields 23b and 23b each having a substantially U-shaped annular shape in a longitudinal sectional view are arranged on the outer peripheral surfaces of both ends of a cylindrical insulator 23a. It is provided for the purpose of protecting the insulator 23a and the bellows 71 from metal vapor generated at the time of electric field relaxation of the connection boundary with the insulator 23a, creepage protection of the insulator 23a, and current switching of the main circuit switching unit 20. .
[0038]
A cylindrical arc shield 26 is provided around the main circuit opening / closing portion 20 and fixed to the vacuum vessel 10 in order to suppress scattering of metal vapor during current switching. Further, the electric field is relaxed near the boundary between the sealing member 41a and the insulator 51, the insulator 51 and the sealing member 41b, the insulator 52 and the sealing member 42b, and the metal on the inner surfaces of the insulators 51 and 52 Rings 51a, 51b, and 52a are provided in order to suppress contamination by steam.
[0039]
On the other hand, the ground opening / closing part 30 includes a fixed electrode 31a and a movable electrode 32a at the tips of the fixed electrode bar 31 and the movable electrode bar 32 arranged in parallel with the fixed electrode bar 21 and the movable electrode bar 22, respectively. . Inside the vacuum vessel 10, the fixed electrode bar 31 is disposed on the movable electrode 22 a side of the main circuit opening / closing part 20, and the movable electrode bar 32 is disposed on the fixed electrode 21 a side of the main circuit opening / closing part 20. The fixed electrode rod 31 is fixed to the vacuum vessel 10 via the sealing member 43a, the insulator 53, and the sealing member 43b, and is electrically insulated from the vacuum vessel 10. On the other hand, the movable electrode bar 32 is connected to an operation unit 62 for opening / closing the ground opening / closing unit 30. The movable electrode rod 32 is connected to the vacuum vessel 10 via the bellows 72, the sealing member 44a, the insulator 54, and the sealing member 44b, and is electrically insulated from the vacuum vessel 10, Operation is possible while maintaining airtightness.
[0040]
In the vicinity of the boundary between the sealing member 43a and the insulator 53, the insulator 53 and the sealing member 43b, the insulator 54 and the sealing member 44b, the electric field is relaxed, and the inner surface of the insulators 53 and 54 is caused by metal vapor. Rings 53a, 53b, and 54a are provided in order to suppress contamination.
[0041]
The movable electrode bar 22 of the main circuit opening / closing part 20 and the fixed electrode bar 31 of the ground opening / closing part 30 are electrically connected by a deformable flexible conductor 80. When the main circuit switching unit 20 is closed and the ground switching unit 30 is open, current flows between the fixed electrode bar 21 of the main circuit switching unit 20 and the fixed electrode bar 31 of the ground switching unit 30. It becomes.
[0042]
In the switchgear configured as described above, since the vacuum vessel 10 is not grounded, the potential of the vacuum vessel 10 depends on the potentials of the main circuit switching unit 20 and the grounding switching unit 30 and the outside of the vacuum vessel 10. The potential difference between the vacuum vessel 10 and the charging unit and between the vacuum vessel 10 and the ground potential is not increased, and the occurrence of a ground fault can be reduced. .
[0043]
In addition, since the main circuit switching unit 20 and the ground switching unit 30 are configured in a vacuum with high insulation performance, it is possible to reduce the necessary insulation distance between the respective components, and the size can be greatly reduced as compared with the prior art. It becomes possible.
[0044]
Further, even when an arc short circuit occurs inside the vacuum vessel 10, there is no possibility of explosion from the arc short circuit because no gas exists inside the vacuum vessel 10.
[0045]
Embodiment 2
4 is a front sectional view showing a configuration of a main part of the switchgear according to the second embodiment of the present invention, FIG. 5 is a top view, and FIG. 6 is a side view.
[0046]
The operation units 61 and 62 for operating the main circuit switching unit 20 and the ground switching unit 30 are provided in parallel on the outer periphery of the vacuum vessel 10, and the operation rod 24 and the movable electrode rod 32 are provided in the vacuum vessel 10. It is arranged in parallel on the same side inside, protrudes from the same surface of the vacuum vessel 10 to the outside, and is connected to operation units 61 and 62 arranged side by side. On the other hand, the fixed electrode bar 21 of the main circuit switching unit 20 and the fixed electrode bar 31 of the ground switching unit 30 are arranged in parallel to face each other, and the movable electrode bar 32 and the operation bar 24 protrude from the surface. It protrudes from the surface opposite to the outside of the vacuum vessel 10. In addition, about the part similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0047]
In the switchgear configured as described above, since the operation units 61 and 62 of the main circuit switching unit 20 and the ground switching unit 30 can be arranged adjacent to each other, the interlock between the drive mechanisms of the operation units 61 and 62 is simplified. can do.
[0048]
Embodiment 3
FIG. 7 is a front sectional view showing the configuration of the main part of the switchgear according to Embodiment 3 of the present invention, and FIG. 8 is a side view of the same.
[0049]
Except for the ring 51b, the electrodes 21a and 22a of the main circuit switching unit 20 and the arc shield 26 are arranged inside the insulator 51, and the arc shield 26 is an electric field in the vicinity of the junction between the insulator 51 and the sealing member 41b. The structure also serves as relaxation. Other parts similar to those of the second embodiment are denoted by the same reference numerals and description thereof is omitted.
[0050]
In the switchgear configured as described above, since the electrodes 21a and 22a of the main circuit opening / closing part 20 are accommodated in the insulator 51, the vacuum vessel 10 can be miniaturized. When the vacuum vessel 10 is formed by press working, the drawing depth is reduced, and the manufacturing cost of the vacuum vessel 10 can be reduced.
[0051]
Embodiment 4
FIG. 9 is a front sectional view showing a configuration of a main part of the switchgear according to the fourth embodiment of the present invention.
[0052]
A support for supporting the arc shield 26 disposed around the electrodes 21a and 22a of the main circuit opening / closing portion 20 is provided on the outer peripheral surface of the arc shield 26, and this is engaged with the central portion of the insulator 51 so as to arc. The shield 26 is fixed and the arc shield 26 is electrically insulated from the vacuum vessel 10. Other parts similar to those of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0053]
In the switchgear configured as described above, since the arc shield 26 and the vacuum vessel 10 are electrically insulated, the discharge is generated from the electrodes 21a and 22a of the main circuit switching unit 20 to the arc shield 26. However, the vacuum vessel 10 does not become a high potential, and the withstand voltage performance is improved.
[0054]
The insulator 51 may be composed of two parts, and the arc shield 26 may be sandwiched and fixed.
[0055]
Embodiment 5
FIG. 10 is a front sectional view showing the configuration of the main part of the fifth embodiment of the switchgear according to the present invention.
[0056]
The flexible conductor 80 that electrically connects the main circuit opening / closing part 20 and the ground opening / closing part 30 sandwiches the plate-like ends of the flexible conductor 80 by two pairs of conductor plates 81a and 81b, respectively. It is fixed by screws 81c. The conductor plates 81 a and 81 b are fixed to the movable electrode bar 22 and the fixed electrode bar 31, respectively, and are connected to the main circuit switching unit 20 and the ground switching unit 30. Further, the conductor plates 81a and 81b are larger than the outer diameter of the insulating rod 23, so that the electric field concentration at the end of the shield 23b of the insulating rod 23 is alleviated and the metal vapor when the main circuit switching unit 20 is shut off. Is prevented from adhering to the surface of the insulator 23a of the insulating rod 23. Other parts similar to those of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0057]
In the switch gear configured as described above, the use of the conductor plates 81a and 81b facilitates the connection of the flexible conductor 80 and improves the assembly workability. In addition, since the electric field relaxation at the end of the shield 23b of the insulating rod 23 and the metal vapor when the main circuit switching unit 20 is shut off can be suppressed from adhering to the creeping surface of the insulator 23a of the insulating rod 23, the withstand voltage performance is improved. To do.
[0058]
Note that a metal plate having a large resistance may be used for one of the conductor plates 81a and 81b for the purpose of reinforcing the strength.
[0059]
Embodiment 6
FIG. 11 is a front sectional view showing the configuration of the main part of the sixth embodiment of the switchgear according to the present invention.
[0060]
The insulating rod 23 of the main circuit opening / closing part 20 is arranged inside the insulator 52. Further, the electrodes 31 a and 32 a of the ground opening / closing part 30 are arranged inside the insulator 54. Other parts similar to those of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0061]
In the switchgear configured as described above, the insulating rod 23 and the ground opening / closing part 30 in which the ground potential and the charging part are opposed to each other inside the vacuum container 10 in the on, shut-off, and disconnected states are respectively the insulators 52. , 54 can reduce the occurrence of ground faults and improve the withstand voltage performance.
[0062]
Embodiment 7
FIG. 12 is a front sectional view showing the configuration of the main part of the seventh embodiment of the switchgear according to the present invention.
[0063]
Between the main circuit opening / closing part 20 and the ground opening / closing part 30, an opening / closing part 90 including a movable electrode 92a and a fixed electrode 91a is provided. The movable electrode 92 a is the tip of the movable electrode bar 92. An operating rod 94 is connected to the other end of the movable electrode rod 92 via an insulating rod 93 composed of an insulator 93a and shields 93b and 93b. The operation rod 94 is connected to an operation unit 63 for opening / closing the opening / closing unit 90. The operation rod 94 is connected to the vacuum vessel 10 through the bellows 73, the sealing member 45a, the insulator 55, and the sealing member 45b, and is electrically insulated from the vacuum vessel 10. It is possible to operate while maintaining. The movable electrode bar 22 of the main circuit opening / closing part 20 and the movable electrode bar 92 of the opening / closing part 90 are electrically connected by a flexible conductor 80a.
[0064]
On the other hand, the fixed electrode 91 a is the tip of the fixed electrode rod 91. The other end of the fixed electrode rod 91 is fixed to the vacuum vessel 10 via an insulating support 95 including an insulator 95a and shields 95b and 95b, and is electrically insulated from the vacuum vessel 10. The fixed electrode bar 91 of the opening / closing part 90 and the fixed electrode bar 31 of the ground opening / closing part 30 are electrically connected by a conductor 80b. Other parts similar to those of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0065]
In the switchgear configured as described above, the withstand voltage performance can be improved by opening between the electrodes 91a and 92a of the open / close section 90 in addition to between the electrodes 21a and 22a of the main circuit open / close section 20 at the time of disconnection and grounding. it can.
[0066]
【The invention's effect】
As described in detail above, according to the switchgear according to the first invention, the vacuum vessel is Electrically isolated from external ground potential Because it is not grounded, The The potential of the vacuum vessel is the same as the potential of each charging part of the main circuit opening and closing part and the ground opening and closing part. Said The potential difference between the vacuum vessel and the charging unit and between the vacuum vessel and the ground potential is not increased, and therefore the occurrence of a ground fault is reduced as compared with the conventional case. It becomes possible to do.
[0067]
In addition, since the main circuit opening / closing part and grounding opening / closing part are housed in a vacuum vessel with high insulation performance, the necessary insulation distance between each part can be reduced, and the size can be greatly reduced compared to the conventional case. Is possible.
[0068]
In addition, even when an arc short circuit occurs inside the vacuum vessel, no gas is present inside the vacuum vessel, so that explosion from the arc short circuit can be prevented.
[0069]
According to the switchgear according to the second aspect of the present invention, since the operation part of the main circuit opening / closing part and the grounding opening / closing part can be disposed adjacent to each other, the interlock between the drive mechanisms of the operation part can be simplified and the product cost can be reduced. It becomes possible.
[0070]
According to the switchgear according to the third aspect of the present invention, since the pair of electrodes of the main circuit switching part is housed in the insulator, it is possible to improve the withstand voltage performance and increase the size of the insulator. On the other hand, the vacuum container can be made smaller. When the vacuum vessel is formed by press working, the drawing depth is reduced, and the manufacturing cost of the vacuum vessel can be reduced.
[0071]
According to the switchgear according to the fourth aspect of the invention, since the arc shield and the vacuum vessel are electrically insulated, even if a discharge occurs from the pair of electrodes of the main circuit opening / closing portion to the arc shield, The container does not become a high potential, and the withstand voltage performance can be improved.
[0072]
According to the switchgear according to the fifth aspect of the present invention, since the fixed part on the movable electrode side of the main circuit opening / closing part of the flexible conductor is larger than the outer diameter of the insulating rod, the electric field concentration at the shield end of the insulating rod is alleviated. It becomes possible to prevent the metal vapor from the main circuit opening / closing part from adhering to the insulating rod.
[0073]
According to the switchgear according to the sixth aspect of the present invention, since the pair of electrodes of the insulating rod and the ground opening / closing part are respectively disposed inside the insulator, it is possible to further improve the withstand voltage performance.
[0074]
According to the switchgear according to the seventh invention, the bus side and the load side can be contacted and separated not only by the main circuit opening / closing part but also by a pair of electrodes provided in the middle of the flexible conductor. The present invention has an excellent effect such that the voltage performance can be further 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 top view showing a configuration of a main part of the switchgear according to the first embodiment of the present invention.
FIG. 3 is a side view showing a configuration of a main part of the switchgear according to the first 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 second embodiment of the present invention.
FIG. 5 is a top view showing a configuration of a main part of a switchgear according to a second embodiment of the present invention.
FIG. 6 is a side view showing a configuration of a main part of a switchgear according to a second embodiment of the present invention.
FIG. 7 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. 8 is a side view showing a configuration of a main part of a switchgear according to a third embodiment of the present invention.
FIG. 9 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. 10 is a front sectional view showing a configuration of a main part of a switchgear according to a fifth embodiment of the present invention.
FIG. 11 is a front sectional view showing a configuration of a main part of a switchgear according to a sixth embodiment of the present invention.
FIG. 12 is a front sectional view showing a configuration of a main part of a switchgear according to a seventh embodiment of the present invention.
FIG. 13 is a plan sectional view showing a configuration of a main part of a conventional switch gear.
FIG. 14 is an electrical connection diagram of a conventional switchgear.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Vacuum vessel, 20 Main circuit opening / closing part, 21 Fixed electrode rod, 21a Fixed electrode, 22 Movable electrode rod, 22a Movable electrode, 23 Insulating rod, 23a Insulator, 23b Shield, 24 Operation rod, 26 Arc shield, 30 Ground opening / closing Part, 31 fixed electrode rod, 31a fixed electrode, 32 movable electrode rod, 32a movable electrode, 41a-44a, 41b-44b sealing member, 51-55 insulator, 51a-54a, 51b, 53b ring, 61-63 operation Part, 71, 72 bellows, 80 flexible conductor, 81a, 81b conductor plate, 91a fixed electrode, 92a movable electrode.

Claims

A main circuit opening / closing portion that contacts and separates a fixed electrode connected to one of the bus-side conductor or the load-side conductor and a movable electrode connected to the other, a fixed electrode connected to one of the load-side conductor or the grounding conductor, and a movable electrode connected to the other A vacuum container that is electrically insulated from an external ground potential and maintained at an intermediate potential between the charging potential of the main circuit switching unit and the ground switching unit and the ground potential. A switchgear characterized by comprising.

2. The switchgear according to claim 1, further comprising two operation parts for operating the main circuit opening / closing part and the ground opening / closing part, wherein the two operation parts are attached in parallel to the outer peripheral surface of the vacuum vessel.

The switchgear according to claim 1 or 2, wherein the pair of electrodes of the main circuit opening / closing portion is disposed inside an insulator for electrically insulating the main circuit opening / closing portion fixing side and the vacuum vessel.

The switchgear according to any one of claims 1 to 3, wherein an arc shield disposed around an electrode of the main circuit opening / closing portion is electrically insulated from the vacuum vessel.

An insulating rod connected to the load side electrode of the main circuit switching unit and having a metal shield for electric field relaxation is electrically connected to each load side electrode of the main circuit switching unit and the ground switching unit. The switchgear according to any one of claims 1 to 4, wherein the fixed part on the circuit opening / closing part side includes a flexible conductor having a dimension larger than an outer diameter dimension of the insulating rod.

An insulating rod of the main circuit opening / closing part is disposed inside an insulator for electrically insulating the main circuit opening / closing part movable side and the vacuum vessel, and a pair of electrodes of the ground opening / closing part are connected to the movable side of the ground opening / closing part. The switchgear according to any one of claims 1 to 5, wherein the switchgear is disposed inside an insulator for electrically insulating the vacuum vessel.

The switchgear according to any one of claims 1 to 6, wherein a pair of electrodes that can be contacted and separated are provided in the middle of a flexible conductor that electrically connects each load side electrode of the main circuit switching unit and the ground switching unit. .