JP4155385B2

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Info

Publication number: JP4155385B2
Application number: JP2001179003A
Authority: JP
Inventors: 敏彦宮崎; 芳之道佛; 州彦水本
Original assignee: Toko Electric Corp
Current assignee: Takaoka Toko Co Ltd
Priority date: 2001-06-13
Filing date: 2001-06-13
Publication date: 2008-09-24
Anticipated expiration: 2021-06-13
Also published as: JP2002374605A

Description

【０００１】
【発明の属する技術分野】
本発明は、主回路開閉器および接地断路器を備える開閉器に関する。
【０００２】
【従来の技術】
地中配電線における区分や引き込み部分には、保守、点検、工事などの際に利用される開閉器が従来より設置されている。従来技術による開閉器は、ガス絶縁開閉器等からなる主回路開閉器および接地断路器をともに備え、主回路開閉器が切りの場合には接地断路器を「非接地」「１相接地」「３相（全相）接地」の３状態に手動切換操作できるようにし、主回路開閉器が入りの場合には接地断路器を「非接地」状態に固定するため接地断路器を手動切換操作できないようにしていた。
【０００３】
そして、このような開閉器に関する先行技術として、例えば、特許第３１４２４７６号の「開閉器」（特許権者は本出願人である）がある。
この開閉器で接地断路器を操作する場合、作業員は接地断路器の接点を入り切りするために連結されている接点駆動軸に、他所から運んできた操作ハンドルを嵌入・接続し、この操作ハンドルを回動させて操作することとなる。
【０００４】
この場合、この特許発明に係る開閉器の特徴部分である接地断路器の切替機構（インターロック機構）により、操作ハンドルの回動操作時に作業員が誤操作を行うおそれを低減させている。ここでいう誤操作とは、例えば、「非接地」から「１相接地」に切り替えたいにも拘わらず、回動操作の行き過ぎにより「３相接地」に接続するような誤接続である。
【０００５】
このような誤操作を防止するインターロック機構とは、操作ハンドルに突設したピンがガイド溝に案内されることにより、「非接地」「１相接地」「３相（全相）接地」という接点切替個所毎に操作ハンドルによる回動操作が停止され、１回の回動操作で２段階の接点切替の誤接続を防止するようにした機構である。
したがって、特許発明にかかる開閉器によれば誤操作を起こすおそれを著しく低減させている。
【０００６】
【発明が解決しようとする課題】
先行技術の開閉器では、インターロック機構を採用して、操作性に優れ、また、接点切り換え時の誤接続を防止するという著しい効果を奏し得るものの、「非接地」→「１相接地」→「３相接地」、あるいは、「３相接地」→「１相接地」→「非接地」というように、所定経路を経る切り換えしかできず、例えば「３相接地」から「非接地」へ切り換えることはできなかった。しかしながら、上記の切換経路以外の他に異なる切換経路を必要とする場合があった。
【０００７】
図１３は地中配電線における区分や引き込み部分に接地される従来の開閉器の回路図である。この従来の開閉器は、回路図に示すように、主回路開閉器１００および接地断路器２００に加え、さらに独立した試験端子３００を備えている。保守、点検、工事など（特に、主回路の耐圧試験や開閉器本体に接続されている絶縁ケーブルの劣化診断等を含めた保守点検時）を行う場合、主回路開閉器１００を切りの状態にし、接地断路器２００を一旦「３相（全相）接地」とし、その後に再び「非接地」とする必要があるが、従来技術の開閉器では、前述のように、そのような経路を取ることはできなかった。
【０００８】
接地断路器２００が「３相（全相）接地」→「非接地」という経路を経ないと、主回路開閉器１００が「切」ながらも、絶縁ケーブルがコンデンサ充電されていて、作業者に思わぬ驚きを与える虞れもあり得る。このように、保守・検査用のため、「３相（全相）接地」→「非接地」という切換ができる切替機構が必要となっていた。
【０００９】
また、このような切替機構では、主回路開閉器が入りであれば、接地断路器を非接地に固定し、「１相接地」又は「３相（全相）接地」への切替を阻止する必要がある。
さらにまた、主回路開閉器を切りに、接地断路器を非接地にして保守点検を行っている最中に、誤って主回路開閉器が入りになって作業員が感電事故を起こす事は絶対にあってはならない。
【００１０】
本発明は、上記のような問題点を解決するためになされたものであり、その目的は、作業者が保守、点検、工事などを行う場合、主回路開閉器および接地断路器を誤接続して作業員に危険が及ぶ事態を防止するような開閉器を提供するものである。
【００１１】
【課題を解決するための手段】
上記課題を解決するための本発明の請求項１に係る発明によれば、
操作ハンドルの回動操作に応じて主回路を入り切りする主回路開閉器と、
接地断路器操作部の操作に応じて非接地・１相接地・３相接地・保守用非接地の４段階で主回路と大地とを接離する接地断路器と、
接地断路器操作部の操作に応じてシャッタをスライド移動させるシャッタ装置を有し、接地断路器が１相接地・３相接地・保守用非接地のときにはシャッタ装置がシャッタを操作ハンドルの回動経路上に位置するようにスライド移動させて操作ハンドルの操作を拘束して主回路開閉器を切りに維持し、また、接地断路器が非接地のときにはシャッタ装置がシャッタを操作ハンドルの回動経路外に位置するようにスライド移動させて操作ハンドルの操作拘束を解除して主回路開閉器を入り切り自在にする第１インターロック機構と、
接地断路器操作部からの駆動により回動するハンドル駆動軸に連結されるとともに鉤爪部を有する誘導金具と、軸支により回動するとともに係合部および突き出しピンを有するＬ字状掛金と、主回路開閉器を入り切りするための主回路開閉駆動軸に固着されるとともに切り欠き部を含む環状ストッパと、を有し、主回路開閉器が切りで接地断路器が非接地の状態から主回路開閉器が入りとするように主回路開閉駆動軸を回動させると環状ストッパにＬ字状掛金の係合部が当接してＬ字状掛金の動作を拘束するとともにＬ字状掛金の突き出しピンが誘導金具の鉤爪部に当接して誘導金具の動作を拘束して誘導金具に連結される接地断路器操作部の駆動を防止することで接地断路器を非接地に維持し、また、主回路開閉器が切りで接地断路器が非接地の状態から接地断路器が１相接地・３相接地・保守用非接地とするときには環状ストッパの切り欠き部にＬ字状掛金の係合部が入りこんで主回路開閉駆動軸の回動を防止することで主回路開閉器を切りに維持する第２インターロック機構と、
を備えることを特徴とする。
【００１２】
また、請求項２に係る発明によれば、
請求項１に記載の開閉器において、
ハンドル駆動軸に固着されるハンドル差込部と、
ハンドル差込部に着脱自在になされて接地断路器を回動操作する部材であって、背面に突起部を有するハンドルレバーと、
二カ所の位置に移動可能になされ、一方の位置では接地断路器による１相接地と３相接地との切替時にハンドルレバーの突起部に当接してハンドルレバーの移動を拘束して１相接地と３相接地との切替を不能とし、また、ハンドル差込部からハンドルレバーが取り外されて移動された他方の位置ではハンドル差込部に取り付けられたハンドルレバーを回動させて１相接地と３相接地との切替を可能とするストッパ用可動レバーと、
を備えることを特徴とする。
【００１３】
また、請求項３に係る発明によれば、
操作スイッチの投入操作に応じて主回路を入り切りする主回路開閉器と、
接地断路器操作部の操作に応じて非接地・１相接地・３相接地・保守用非接地の４段階で主回路と大地とを接離する接地断路器と、
接地断路器操作部の操作に応じてシャッタをスライド移動させるシャッタ装置を有し、接地断路器が１相接地・３相接地・保守用非接地のときにはシャッタ装置がシャッタを操作スイッチ前面に位置するようにスライド移動させて操作スイッチの操作を拘束して主回路開閉器を切りに維持し、また、接地断路器が非接地のときにはシャッタ装置がシャッタを操作スイッチの前面外に位置するようにスライド移動させて操作スイッチの操作拘束を解除して主回路開閉器を入り切り自在にする第１インターロック機構と、
接地断路器操作部からの駆動により回動するハンドル駆動軸に連結されるとともに鉤爪部を有する誘導金具と、軸支により回動するとともに係合部および突き出しピンを有するＬ字状掛金と、主回路開閉器を入り切りするための主回路開閉駆動軸に固着されるとともに切り欠き部を含む環状ストッパと、を有し、主回路開閉器が切りで接地断路器が非接地の状態から主回路開閉器が入りとするように主回路開閉駆動軸を回動させると環状ストッパにＬ字状掛金の係合部が当接してＬ字状掛金の動作を拘束するとともにＬ字状掛金の突き出しピンが誘導金具の鉤爪部に当接して誘導金具の動作を拘束して誘導金具に連結される接地断路器操作部の駆動を防止することで接地断路器を非接地に維持し、また、主回路開閉器が切りで接地断路器が非接地の状態から接地断路器が１相接地・３相接地・保守用非接地とするときには環状ストッパの切り欠き部にＬ字状掛金の係合部が入りこんで主回路開閉駆動軸の回動を防止することで主回路開閉器を切りに維持する第２インターロック機構と、
を備えることを特徴とする。
【００１４】
また、請求項４に係る発明によれば、
請求項３に記載の開閉器において、
ハンドル駆動軸に固着されるハンドル差込部と、
ハンドル差込部に着脱自在になされて接地断路器を回動操作する部材であって、背面に突起部を有するハンドルレバーと、
二カ所の位置に移動可能になされ、一方の位置では接地断路器による１相接地と３相接地との切替時にハンドルレバーの突起部に当接してハンドルレバーの移動を拘束して１相接地と３相接地との切替を不能とし、また、ハンドル差込部からハンドルレバーが取り外されて移動された他方の位置ではハンドル差込部に取り付けられたハンドルレバーを回動させて１相接地と３相接地との切替を可能とするストッパ用可動レバーと、
を備えることを特徴とする。
【００１５】
また、請求項５に係る発明によれば、
請求項１〜請求項４の何れか一項に記載の開閉器において、
接地断路器操作部の操作をシャッタ装置へ伝達する鋼線を備えることを特徴とする。
【００２０】
【発明の実施の形態】
以下、図に基づいて本発明の開閉器の実施形態を説明する。
まず、本発明の開閉器の回路系について説明する。
図１は、本実施形態の開閉器の説明図であって、図１（ａ）は３回路例の多回路開閉器の電気的結線図、図１（ｂ）は接地断路器の説明図である。
本実施形態の開閉器は、主回路開閉器１、接地断路器２、ＣＴ（変流器）３およびＰＤ（コンデンサ）４を備えている。
【００２１】
主回路開閉器１は、主回路を入り切りするようになされている。
接地断路器２は、主回路と大地とを接離するものであり、順経路である「切（非接地）」→「１相接地」→「３相（全相）接地」→「保守（非接地）」と、逆経路である「保守（非接地）」→「３相（全相）接地」→「１相接地」→「切（非接地）」という全４段階の切替順序で接地できるようになされている。
【００２２】
接地断路器２の接地可動接点は、図１（ｂ）で示すように、便宜上、切（非接地）、接地、保守（非接地）、と３段階で表示されているがこの接地には、先に説明したように、さらに１相接地と、３相（全相）接地と２段階存在している。この１相接地は、３相接地の前に予め安全のため先行して行われる接地である。
【００２３】
開閉器内の主回路には、センサであるＣＴ３、ＰＤ４が取り付けられており、ＣＴ３は主回路の電流、また、ＰＤ４は主回路の電圧を検出する。
これら、主回路開閉器１、接地断路器２、ＣＴ３およびＰＤ４は、３回路分纏めてガスケース５内に収納されている。ガスケース５内ではガスが充填されてガス絶縁がなされている。また、ガスケース５は接地されて筐体アースが施されており、図１（ａ）でも明らかなように、接地断路器２およびＰＤ４がこのガスケース５を介して接地されている。
【００２４】
続いて、このような開閉器の機構系について説明する。
図２は本実施形態の開閉器の一部正面図、図３は同じく一部側面図、図４は主回路開閉器操作部の動作説明図、図５，図６，図７は接地断路器操作部の動作説明図、図８は１回路分の要部回路機構図、図９は接地断路器の動作説明図である。
【００２５】
まず開閉器の操作部について説明する。図２，図３で示すように、開閉器の操作部は、大別して主回路開閉器操作部１０、接地断路器操作部２０とを備えている。
主回路開閉器操作部１０は、図２で示すように、操作ハンドル１１と、本発明の拘束部の一具体例である図４で示すようなシャッタ装置１２、図示しない操作スイッチ、および図示しない操作スイッチ用のシャッタ装置を備えている。
【００２６】
主回路開閉器操作部１０を用いて主回路開閉器１（図１参照）を操作する場合、自動と手動が選択できる。
自動の場合、操作ハンドル１１を図２，図３で示すように上側（つまり「自動」の位置）に位置させておき、電子スイッチのような操作スイッチ（図示せず）による投入操作を行って入り切りする。
手動の場合、操作スイッチにより主回路開閉器１を切りにしておき、操作ハンドル１１を図３で示すように矢印Ａ方向へ手動操作して入りにする。
【００２７】
接地断路器操作部２０は、図２，図５（ａ），（ｂ）で示すように、指針２１、ハンドル差込部２２を備えている。接地断路器操作部２０を操作する場合には、図５〜図７で示すように手動のハンドルレバー２３をハンドル差込部２２に差し込んで回動操作させて行う。なお、主回路開閉器操作部１０での電子スイッチのような他のスイッチは存在せず、図１で示す接地断路器２は、手動のハンドルレバー２３を操作して接離する操作ができるのみである。
【００２８】
これら主回路開閉器操作部１０および接地断路器操作部２０は、図８で示す内部機構に連結されており、主回路開閉器１および接地断路器２を駆動する。
まず、主回路開閉器１について説明する。
主回路開閉器操作部１０により入り切りされる主回路開閉器１は、図８で示すように３個の主回路可動接点１ａおよび３個の主回路固定接点１ｂを備え、上からＵ相、Ｖ相、Ｗ相用の開閉接点である。なお、図８では切り状態の主回路開閉器１が図示されている。
【００２９】
３個の主回路可動接点１ａは、それぞれ３個のレバー３１に連結され、さらに３個のレバー３１は、主回路開閉駆動軸３２に固定されたレバー連結板３３により連結されている。
なお、実際には、さらに主回路開閉駆動軸３２から主回路可動接点１ａまで、レバー、リンク、ピン、畜勢バネ、接点を連結駆動させるロッド等を介した伝達機構が含まれているが説明の簡略化のためその詳述を省略する。これら主回路可動接点１ａは母線で他の回路に接続され、また、主回路固定接点１ｂは、外部ブッシングに接続されている。
【００３０】
この主回路開閉駆動軸３２は、図２，図３で示す操作機構部３４まで到達しており、操作機構部３４内の図示しない伝達機構により操作ハンドル１１と機械的に連動するようになされている。図３で示す操作ハンドル１１を矢印Ａ方向へ向けて回動させると、主回路開閉駆動軸３２が図８の矢印Ｂ方向に回動して３個の主回路固定接点１ｂに主回路可動接点１ａが投入され、主回路開閉器１を入りにする。逆に操作ハンドル１１を上側へ回動させると、主回路開閉器１を切りにする。
【００３１】
また、操作機構部３４は、図示しない操作スイッチとも電気的に接続されており、この操作スイッチをオンにすると、モータ等の駆動部により主回路開閉駆動軸３２が回動して主回路開閉器１が入りになり、逆に操作スイッチをオフにすると駆動部により主回路開閉駆動軸３２が回動して主回路開閉器１が切りになる。
【００３２】
続いて、接地断路器２について説明する。
接地断路器操作部２０により操作される接地断路器２は、図８で示すように、３個の接地可動接点２ａおよび３個の接地固定接点２ｂを備え、上からＵ相、Ｖ相、Ｗ相用の断路器である。なお、図８では非接地の場合の接地断路器２が図示されている。
【００３３】
３個の接地固定接点２ｂは、図８でも示すように、板状であって、主回路固定接点１ｂに一体に固定されている。この接地固定接点２ｂに接地可動接点２ａを接触して接地状態となる。
なお、接地可動接点２ａ及び接地固定接点２ｂ共に、図示しないレバー、リンク、ピン、畜勢バネ、接点を連結駆動させるロッドなどを介した伝達機構の詳述は省いている。
【００３４】
接地可動接点２ａは、図９で示すように、一定方向（例えば時計回り方向）に回転し、非接地位置、１相（Ｖ相のみ）接地位置、３相（Ｕ，Ｖ，Ｗ全相）接地位置、保守用非接地位置で停止するようになされている。これらに応じて主回路が、接地状態、１相接地状態、３相接地状態、非接地状態となる。図９でも明らかなように、Ｖ相の接地固定接点２ｂは、他相より接続面が突き出た端子を設けており、１相の接地が先行するようになされている。
【００３５】
続いて、これら主回路開閉器１および接地断路器２の動作を踏まえ、第１，第２インターロック機構について説明する。
まず第１インターロック機構について説明する。この第１インターロック機構では、接地断路器２が１相接地・３相接地・保守用非接地のときには主回路開閉器操作部１０の操作を防止して主回路開閉器１を切りに維持し、また、接地断路器２が切り（非接地）のときには主回路開閉器操作部１０の操作防止を解除して主回路開閉器１を入り切り自在にするような機構である。
【００３６】
この第１インターロック機構は、ハンドル差込部２２（図２，図５〜図７参照）と、ハンドル差込部２２に一体に固着されるハンドル駆動軸４１（図８参照）と、このハンドル駆動軸４１に取り付けられてハンドル駆動軸４１の回動により図８で上下方向に移動する鋼線４２と、鋼線４２の移動に応じてシャッタをスライドさせ操作ハンドル１１（図２〜図４参照）の移動を拘束するシャッタ装置１２（図４（ｂ）参照）を備えている。
【００３７】
この鋼線４２は、具体的にはステンレス製ワイヤであり、ステンレス製ワイヤ等の鋼線で連結することにより、開閉器内部での配線に制約が少なくなり、シャッタ装置１２の設置位置の自由度が増し、開閉器の構成各部を適宜配置してコンパクトに収納できるという利点がある。
【００３８】
主回路開閉器１が切り状態の場合には、接地断路器操作部２０では特に制約がなく、ハンドル差込部２２にはめ込んだハンドルレバー２３を自由に回動させることができるようになる。図５（ａ）で示すように接地断路器２を切り（非接地）としている場合には、主回路開閉器１の入り切りを可能とするため、主回路開閉器操作部１０では図４（ａ）で示すように操作ハンドル１１が拘束されることなく回動可能にしている。また、図示しないが操作スイッチでも前面に拘束するようなシャッタが現れず、投入可能になされている。
【００３９】
このような状態で接地断路器２を操作する。具体的には、図５〜図７で示すような操作を行うものである。
まず、図５（ｂ）で示すように、手動のハンドルレバー２３をハンドル差込部２２に差し込み、図５（ａ）で示すように接地断路器操作部２０を操作可能な状態にする。
【００４０】
続いて、図５（ａ）で示す切り（非接地）から図６（ａ）で示す１相接地へハンドルレバー２３を回動させると、図８で示す第１リンク５１、第２リンク５２が移動して、離接駆動軸５３が回動し、第３リンク５４を経て操作ロッド５５が下側へ移動する。そして、図９で示すように、接地可動接点２ａは、非接地位置から１相接地位置へ移動する。この１相接地では、Ｕ相，Ｗ相では接点が接触していないが、Ｖ相では接点が接触するというものである。
【００４１】
そして１相接地へ移動した場合は、図８で示すハンドル駆動軸４１の回動によりに鋼線４２が矢印Ｃ方向（上方向）に移動してシャッタ装置１２を駆動させて、図４（ｂ）で示すようにシャッタをスライドさせ、操作ハンドル１１の回動を拘束する。また、図示しないが操作スイッチの前面にシャッタが現れて、操作スイッチを押下できないように拘束する。
これにより、１相接地のときに誤って主回路開閉器１を入りに操作ができないように拘束される。
【００４２】
続いて、図６（ａ）で示す１相接地から図７（ａ）で示す３相接地へハンドルレバー２３を回動させるときは、あえて回動動作に制限を加えることとなる。図６（ａ）で示すように、ハンドル差込部２２に嵌合されたハンドルレバー２３は、ハンドルレバー２３の背面に設けた突起部２４（図５（ｂ）参照）とストッパ用可動レバー２５とが当接しているため、このままでは回動させることができない。
【００４３】
そこで、ハンドルレバー２３を一旦取り外し、ストッパ用可動レバー２５を図６（ｂ）の矢印Ｄ方向に回動させてハンドルレバー通過位置に移動させ、再度ハンドルレバー２３を取り付けてから図７（ａ）で示す３相接地に回動させない限り、以後の接地断路器２の操作を阻止するようにしている。
これは、１相接地状態が長時間になるようにして、確実に大地に放電するためである。
【００４４】
そして、図７（ａ）で示すように３相接地の状態になったならば、図９で示すように、接地可動接点２ａは、１相接地位置から３相接地位置（図９中で実線であらわされる接地可動接点２ａの位置）へ移動する。この３相接地では、Ｕ相，Ｖ相，Ｗ相ともに接点が接触している。
【００４５】
なお、接地断路器２を１相接地（図６（ａ）参照）から３相接地（図７（ａ）参照）で示す状態へ移動させた場合、鋼線４２が上方向に移動してもシャッタ装置１２はそのまま図４（ｂ）で示すようにシャッタをスライドさせた状態を維持し、操作ハンドル１１の回動を拘束し続ける。また、図示しないが操作スイッチの前面にシャッタが現れた状態を維持し、スイッチを押下できないように拘束し続ける。
【００４６】
続いて、図７（ａ）で示す３相接地から図７（ｂ）で示す保守用非接地へハンドルレバー２３を回動させると、図９で示すように、接地可動接点２ａは、３相接地位置から保守用非接地へ移動する。この保守用非接地では、Ｕ相，Ｖ相，Ｗ相ともに接点が接触しておらず、非接地と同じであるが、３相接地→非接地という経路を実現させている点が新規である。
【００４７】
なお、接地断路器２を３相接地（図７（ａ）参照）から保守用非接地（図７（ｂ）参照）で示すへ移動させた場合、鋼線４２が上方向に移動してもシャッタ装置１２はそのまま図４（ｂ）で示すようにシャッタをスライドさせた状態を維持し、操作ハンドル１１の回動を拘束し続ける。また、図示しないが操作スイッチの前面にシャッタが現れた状態を維持し、スイッチを押下できないように拘束し続ける。
【００４８】
なお、逆経路を辿り、接地断路器２を保守用非接地・３相接地・１相接地にしたときも、このシャッタ装置１２は、図４（ｂ）で示すように操作ハンドル１１および図示しない操作スイッチ１２を拘束しつづけるが、非接地になった場合には操作の拘束を解除するため、シャッタ装置１２は、図４（ａ）で示すように操作可能な状態となる。
【００４９】
このように、第１インターロック機構は、接地断路器２が「切」位置（非接地）にある時のみ主回路開閉器１を操作可能とし、接地断路器２が「切」位置以外（１相接地・３相接地・保守用非接地）では主回路開閉器１を操作不可能となるように拘束するため、保守・点検・工事時に誤って主回路開閉器を入りにするおそれを著しく低減する。
【００５０】
なお、シャッタ装置１２に代えて、図示しない他のストッパ部材やレバー等を操作ハンドル１１に係止させるようにして、操作を拘束するようにしていもよい。
また、伝達手段として鋼線４２を用いることとして説明したが、鋼線４２に限定する趣旨ではないことはいうまでもなく、例えばシャッタ装置１２の位置によってはリンク等伝達機構を介してシャッタ装置１２と接地断路器操作部２０を連結してもよい。
【００５１】
続いて、第２インターロック機構について説明する。
図１０は第２インターロック機構の構成図、図１１，図１２は第２インターロック機構の動作説明図である。
第１インターロック機構は、接地断路器２が切り（非接地）以外では主回路開閉器の入り切り操作を防止するものであったが、第２インターロック機構では、主回路開閉器１が入りのときには接地断路器操作部２０の操作を防止して接地断路器２を非接地の状態に維持し、主回路開閉器１が切りのときには接地断路器操作部２０の操作防止を解除して接地断路器２を接離可能とし、また、接地断路器が１相接地・３相接地・保守用非接地のときには逆に主回路開閉器１の入り切り動作を防止する機構である。
【００５２】
このような第２インターロック機構は、図１０〜図１２で示すように、誘導金具６１と、Ｌ字状掛金６２と、環状ストッパ６３と、操作力発生部６４とを備えている。
誘導金具６１は、図１０（ａ），（ｂ）で示すように、回動するハンドル駆動軸４１に連結され、接地断路器操作部２０からの駆動により回動するようになされている。この誘導金具６１は、鉤爪部６１ａおよびガイド部６１ｂを有している。
Ｌ字状掛金６２は、支軸６２ａにより回動するようになされ、下側へ突出される係合部６２ｂおよび図面手前に突出する突き出しピン６２ｃを有している。
【００５３】
環状ストッパ６３は、図１２で示すように、先に説明したＷ相用のレバー連結板３３を環状ストッパ６３として使用するものであり、切り欠き部６３ａが設けられている。なお、レバー連結板３３と環状ストッパ６３とを別途設けてもよいが、機構系の簡素化を実現できる点から見て、本実施形態のように兼用させることが好ましい。
操作力発生部６４は、図１０で示すように、ねじりコイルばね６４ａ、従動子６４ｂを備えている。
【００５４】
続いて、第２インターロック機構の機能について、主回路開閉器操作部１０および接地断路器操作部２０の操作を絡めて説明する。
まず、主回路開閉器１が切りで接地断路器２も非接地の状態から、接地断路器２を動作させた場合に、主回路開閉器１を切り状態に維持する機能について説明する。
【００５５】
主回路開閉器１が切りで接地断路器２も非接地である場合、第２インターロック機構は、図１０（ａ）（ｂ）および図１２（ａ）で示すような状態となっている。
誘導金具６１に設けられたガイド部６１ａには、ねじりコイルバネ６４ａにより付勢された従動子６４ｂが軸方向へ向けて押圧しており、ガイド部６１ｂの谷部に従動子６４ｂが位置するときに、図５〜図７で示すようにハンドルレバー２３を一旦停止させることとなり、この状態からハンドルレバー２３に大きな回動力を加えないと、回動しないようになされている。この場合、ガイド部６１ｂの谷部の位置は、図９で示す接地可動接点２ａの位置に対応する。
【００５６】
この誘導金具６１の鉤爪部６１ａとＬ字状掛金６２の突き出しピン６２ｃとは、図１０（ｂ）で示すように係止されるようになされている。
このＬ字状掛金６２もねじりコイルバネにより図１０（ｂ）の矢印Ｅの方向に移動するように付勢されているが、誘導金具６１の鉤爪部６１ａとＬ字状掛金６２の突き出しピン６２ｃが係止されるとＬ字状掛金６２は図１０（ｂ）で示す位置で停止する。これが接地断路器２が非接地の場合の、Ｌ字状掛金６２の位置である。
【００５７】
さて、接地断路器操作部２０のハンドルレバーを回動操作して非接地（図５（ａ）参照）から１相接地（図６（ａ）参照）にすると、ハンドル駆動軸４１が誘導金具６１を回動させ、図１１（ａ）の状態から図１１（ｂ）の状態となるように矢印Ｆ方向に回動する（１相接地・３相接地・保守用非接地）。
この場合、図１１（ｂ）の突き出しピン６２ｃは矢印Ｇの方向へ軌跡を描きつつ移動して鉤爪部６１ａから離脱しながら、Ｌ字状掛金６２はねじりコイルバネの付勢力により下降する。そして、このＬ字状掛金６２の先端の係合部６２ｂが下降すると、図１２（ａ）から図１２（ｂ）の状態になり、環状ストッパ６３の切り欠き部６３ａに入るようになされている。
【００５８】
切り欠き部６３ａに係合部６２ｂが入り込むと、主回路開閉駆動軸３２を回動させることができなくなり、主回路開閉器操作部１０の操作ハンドル１１を回動させたり、図示しない操作スイッチを押下したとしても、主回路駆動軸の移動は拘束されたままであるので、主回路開閉器１を入りにすることはできない。
【００５９】
したがって、第２インターロックでは、主回路開閉器１を「切」・接地断路器２を「非接地」の状態から接地用開閉器２を１相接地・３相接地・保守用非接地とするようにハンドルレバー３２を操作させるとき、環状ストッパ６３の切り欠き部６３ａにＬ字状掛金６２の係合部６２ｂが入りこんで主回路開閉駆動軸３２の回動を防止し、主回路開閉器１の入り切りをできないようにする。
【００６０】
続いて、第２インターロック機構の他の機能について説明する。
今度は、主回路開閉器１が切りで接地断路器２が非接地である状態から主回路開閉器１を入りにした場合、接地断路器操作部２０を操作できないようにする機能である。
【００６１】
主回路開閉器１が入りとなるように主回路開閉駆動軸３２を回動させると主回路開閉駆動軸３２の環状ストッパは、図１２（ａ）から図１２（ｃ）の状態になるため、環状ストッパ６３にＬ字状掛金６２の係合部６２ｂが当接してＬ字状掛金６２は下降できなくなる（図１２（ｂ）参照）。
この場合、突き出しピン６２ｃと鉤爪部６１ａとは図１０（ｂ）で示すように係止された状態となり、仮にハンドルレバー２３の操作により誘導金具６１が回動しようとしても、突き出しピン６２ｃと鉤爪部６１ａの下側とが接触して、誘導金具６１が回動できない、つまり誘導金具６１の動作を拘束し、ハンドルレバー２３は操作できない（図５（ａ）の状態が維持される）こととなる。
【００６２】
逆に主回路開閉器１を切りにするように主回路開閉駆動軸３２を回動させると、図１２（ｃ）から図１２（ａ）の状態となり、環状ストッパ６３の切り欠き部６３ａにＬ字状掛金６２の係合部６２ｂが進入可能となってＬ字状掛金６２を移動自在となり、突き出しピン６２ｃが誘導金具６１の鉤爪部６１ａから離脱しつつ移動できるようになって誘導金具６１を回動自在とし、接地断路器操作部２０の操作防止を解除して接地断路器２を接離可能とする。
第２インターロック機構はこのようになる。
【００６３】
以上説明したように本実施形態における開閉器では第１インターロック機構と第２インターロック機構とを設けたため、二重にインターロックを施することができ、保守点検作業者への危難が及ぶようなおそれを防止している。
【００６４】
また、先に図を用いて説明したように、本発明による接地断路器の操作手順では、１相接地と全相接地との切替時のみ、接地断路器を操作するハンドル差込部２２と嵌合されたハンドルレバー２３が、ハンドルレバー２３の背面に設けた突起部２４とストッパ用可動レバー２５とを当接させ、ハンドルレバー２３を一旦取り外し再び取り付けることと、ストッパ用可動レバー２５を回動しハンドルレバー通過位置に移動させることを行わない限り、以後の接地断路器の操作を阻止するようにしている。
１相接地を行った後、これらの手順を経るため、万が一主回路「入」状態で１相接地された時点で地絡事故発生しても、変電所遮断器がトリップし、保守点検作業者への最悪の事態は回避できる。
【００６５】
また、接地断路器２は、一定方向（例えば図９で示すように時計回り方向）に「切」「１相接地」「３相（全相）接地」「保守用非接地」の切替順序となっており、必ず主回路が、３相（全相）接地状態の後、保守用非接地状態となる。主回路を非接地とし耐圧試験を行う際に、接地断路器２の切替が「保守」と「接地」と同位置、或いは、「接地」前の「保守」位置、等手順の行き違いによる事故を皆無に出来る。
【００６６】
このように機構のみならず、操作手順に対しても保護手段を施した第１，第２インターロック機構を備え、しかもコンパクトに接地断路器を付設した開閉器を提供することで、作業者が保守、点検、工事、等安全に行うことができるようになる。
【００６７】
【発明の効果】
以上説明したように、本発明にれば、作業者が保守、点検、工事などを行う場合、主回路開閉器および接地断路器を誤接続して作業員に危険が及ぶ事態を防止するような開閉器を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施形態の開閉器の説明図であって、図１（ａ）は３回路例の多回路開閉器の電気的結線図、図１（ｂ）は接地断路器の説明図である。
【図２】本発明の実施形態の開閉器の一部正面図である。
【図３】本発明の実施形態の開閉器の一部側面図である。
【図４】本発明の実施形態の開閉器の主回路開閉器操作部の動作説明図である。
【図５】本発明の実施形態の開閉器の接地断路器操作部の動作説明図である。
【図６】本発明の実施形態の開閉器の接地断路器操作部の動作説明図である。
【図７】本発明の実施形態の開閉器の接地断路器操作部の動作説明図である。
【図８】本発明の実施形態の開閉器の１回路分の要部回路機構図である。
【図９】本発明の実施形態の開閉器の接地断路器の動作説明図である。
【図１０】本発明の実施形態の開閉器の第２インターロック機構の構成図である。
【図１１】本発明の実施形態の開閉器の第２インターロック機構の動作説明図である。
【図１２】本発明の実施形態の開閉器の第２インターロック機構の動作説明図である。
【図１３】従来の開閉器の回路図である。
【符号の説明】
１主回路開閉器
１ａ主回路可動接点
１ｂ主回路固定接点
２接地断路器
２ａ接地可動接点
２ｂ接地固定接点
３ＣＴ
４ＰＤ
５ガスケース
１０主回路開閉器操作部
１１操作ハンドル
１２シャッタ装置
２０接地断路器操作部
２１指針
２２ハンドル差込部
２３ハンドルレバー
２４突起部
２５ストッパ用可動レバー
３１レバー
３２主回路開閉駆動軸
３３レバー連結板
３４操作機構部
４１ハンドル駆動軸
４２鋼線
５１第１リンク
５２第２リンク
５３離接駆動軸
５４第３リンク
５５操作ロッド
６１誘導金具
６１ａ鉤爪部
６１ｂガイド部
６２Ｌ字状掛金
６２ａ支軸
６２ｂ係合部
６２ｃ突き出しピン
６３環状ストッパ
６３ａ切り欠き部
６４操作力発生部
６４ａねじりコイルバネ
６４ｂ従動子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch provided with a main circuit switch and a ground disconnector.
[0002]
[Prior art]
Conventionally, switches used for maintenance, inspection, construction, etc. have been installed in sections and lead-in portions of underground distribution lines. Prior art switches are equipped with both a main circuit switch consisting of a gas-insulated switch and the like, and a grounding disconnector. When the main circuit switch is turned off, the grounding disconnector is “ungrounded” or “one-phase grounding”. Enables manual switching operation to 3 states of “3-phase (all phases) grounding”, and when main circuit switch is on, manually switches the grounding disconnector to fix the grounding disconnector in “non-grounded” state. I was unable to do it.
[0003]
As a prior art related to such a switch, for example, there is a “switch” disclosed in Japanese Patent No. 3142476 (the patentee is the present applicant).
When operating the grounding disconnector with this switch, the operator inserts and connects the operation handle carried from another place to the contact drive shaft connected to turn on and off the contact of the grounding disconnector. It will be operated by rotating.
[0004]
In this case, the switching mechanism (interlock mechanism) of the ground disconnector, which is a characteristic part of the switch according to this patent invention, reduces the possibility of an operator performing an erroneous operation when the operating handle is turned. The erroneous operation mentioned here is, for example, an erroneous connection in which, although it is desired to switch from “non-ground” to “one-phase grounding”, connection to “three-phase grounding” occurs due to excessive rotation operation.
[0005]
The interlock mechanism for preventing such an erroneous operation is called “non-grounding”, “one-phase grounding”, “three-phase (all-phase) grounding” by guiding a pin protruding from the operation handle into the guide groove. This is a mechanism in which the rotation operation by the operation handle is stopped for each contact switching portion, and the erroneous connection of the two-stage contact switching is prevented by one rotation operation.
Therefore, according to the switch according to the patented invention, the possibility of erroneous operation is significantly reduced.
[0006]
[Problems to be solved by the invention]
Prior art switches adopt an interlock mechanism, which is excellent in operability and can have a remarkable effect of preventing erroneous connection at the time of switching contacts, but “ungrounded” → “one-phase grounding” -> "3-phase grounding" or "3-phase grounding"-> "1-phase grounding"-> "non-grounding" can only be switched through a predetermined path, for example, from "3-phase grounding" to " It was not possible to switch to “ungrounded”. However, there are cases where a different switching path is required in addition to the switching path described above.
[0007]
FIG. 13 is a circuit diagram of a conventional switch that is grounded to a section or a lead-in portion of an underground distribution line. As shown in the circuit diagram, this conventional switch is provided with an independent test terminal 300 in addition to the main circuit switch 100 and the ground disconnect switch 200. When performing maintenance, inspection, construction, etc. (especially during the maintenance inspection including the breakdown test of the main circuit and the deterioration diagnosis of the insulation cable connected to the switch body), the main circuit switch 100 is turned off. The ground disconnector 200 needs to be set to “three-phase (all-phase) grounding” and then “ungrounded” again. However, in the conventional switch, as described above, such a route is taken. I couldn't.
[0008]
If the ground disconnector 200 does not go through the path of “three-phase (all phases) ground” → “non-ground”, the main circuit switch 100 is “turned off”, but the insulated cable is charged by the capacitor, There is also the possibility of unexpected surprises. Thus, for maintenance and inspection, a switching mechanism capable of switching from “three-phase (all-phase) grounding” to “non-grounding” is required.
[0009]
In addition, in such a switching mechanism, if the main circuit switch is turned on, the grounding disconnector is fixed to non-grounding and switching to “one-phase grounding” or “three-phase (all-phase) grounding” is prevented. There is a need to.
In addition, it is absolutely possible that the main circuit switch will accidentally turn on and cause an electric shock accident during maintenance while the main circuit switch is turned off and the grounding disconnect switch is ungrounded. Must not be.
[0010]
The present invention has been made to solve the above-described problems. The purpose of the present invention is to erroneously connect the main circuit switch and the ground disconnector when an operator performs maintenance, inspection, construction, or the like. Therefore, a switch that prevents danger to workers is provided.
[0011]
[Means for Solving the Problems]
  According to the invention of claim 1 of the present invention for solving the above problems,
  A main circuit switch that turns on and off the main circuit according to the turning operation of the operation handle;
  A grounding disconnector that connects and disconnects the main circuit and the ground in four stages of non-grounding, one-phase grounding, three-phase grounding, and non-grounding for maintenance in accordance with the operation of the grounding disconnector operation unit,
  There is a shutter device that slides the shutter according to the operation of the earthing disconnector operating section. When the earthing disconnector is one-phase grounding, three-phase grounding, or non-maintenance for maintenance, the shutter device rotates the operation handle. The main circuit switch is kept off by restricting the operation of the operation handle by sliding it so that it is positioned on the moving path. Also, when the grounding disconnector is not grounded, the shutter device rotates the shutter. A first interlock mechanism that allows the main circuit switch to be turned on and off by slidably moving it so that it is located outside the path,
  A guide fitting connected to a handle drive shaft that is rotated by driving from the ground disconnector operating portion and having a claw portion, an L-shaped latch that is rotated by a shaft support and has an engaging portion and a protruding pin, An annular stopper including a notch and fixed to a main circuit switching drive shaft for turning on and off the circuit switch, and the main circuit switching from a state in which the main circuit switch is cut and the grounding disconnector is not grounded When the main circuit opening / closing drive shaft is rotated so that the device is inserted, the engaging portion of the L-shaped latch comes into contact with the annular stopper to restrain the operation of the L-shaped latch and the protruding pin of the L-shaped latch The grounding disconnector is kept ungrounded by contacting the claw part of the guiding bracket and restraining the operation of the guiding bracket to prevent the operation of the grounding disconnector operating unit connected to the guiding bracket. The device is cut off and the ground disconnector is not When the grounding disconnector is switched from ground to 1-phase grounding, 3-phase grounding, or non-maintenance for maintenance, the engaging portion of the L-shaped latch enters the notch of the annular stopper and the main circuit switching drive shaft rotates. A second interlock mechanism for keeping the main circuit switch off by preventing movement;
  It is characterized by providing.
[0012]
  Moreover, according to the invention which concerns on Claim 2,
  The switch according to claim 1, wherein
  A handle insertion part fixed to the handle drive shaft;
  A handle lever that is detachably attached to the handle insertion portion and rotates the ground disconnector, and a handle lever having a protrusion on the back surface,
  It is possible to move to two positions. At one position, when switching between one-phase grounding and three-phase grounding by the ground disconnector, it contacts the protrusion of the handle lever and restrains the movement of the handle lever. Switching between grounding and three-phase grounding is disabled, and the handle lever attached to the handle insertion part is rotated at the other position where the handle lever is removed from the handle insertion part and moved. A movable lever for stopper that enables switching between phase grounding and three-phase grounding;
  TheIt is characterized by providing.
[0013]
  According to the invention of claim 3,
  A main circuit switch that turns on and off the main circuit according to the operation of turning on the operation switch;
  A grounding disconnector that connects and disconnects the main circuit and the ground in four stages of non-grounding, one-phase grounding, three-phase grounding, and non-grounding for maintenance in accordance with the operation of the grounding disconnector operation unit,
  There is a shutter device that slides the shutter according to the operation of the earthing disconnector operating unit. When the earthing disconnector is one-phase grounding, three-phase grounding, or non-maintenance for maintenance, the shutter device puts the shutter in front of the operation switch. The main circuit switch is kept off by restraining the operation of the operation switch by sliding it so that it is positioned, and the shutter device is positioned outside the front face of the operation switch when the ground disconnector is not grounded. A first interlock mechanism that allows the main circuit switch to be freely turned on and off by sliding and moving the operation switch to release
  A guide fitting connected to a handle drive shaft that is rotated by driving from the ground disconnector operating portion and having a claw portion, an L-shaped latch that is rotated by a shaft support and has an engaging portion and a protruding pin, An annular stopper including a notch and fixed to a main circuit switching drive shaft for turning on and off the circuit switch, and the main circuit switching from a state in which the main circuit switch is cut and the grounding disconnector is not grounded When the main circuit opening / closing drive shaft is rotated so that the device is inserted, the engaging portion of the L-shaped latch comes into contact with the annular stopper to restrain the operation of the L-shaped latch and the protruding pin of the L-shaped latch The grounding disconnector is kept ungrounded by contacting the claw part of the guiding bracket and restraining the operation of the guiding bracket to prevent the operation of the grounding disconnector operating unit connected to the guiding bracket. The device is cut off and the ground disconnector is not When the grounding disconnector is switched from ground to 1-phase grounding, 3-phase grounding, or non-maintenance for maintenance, the engaging portion of the L-shaped latch enters the notch of the annular stopper and the main circuit switching drive shaft rotates. A second interlock mechanism for keeping the main circuit switch off by preventing movement;
  TheIt is characterized by providing.
[0014]
  Moreover, according to the invention which concerns on Claim 4,
  The switch according to claim 3,
  A handle insertion part fixed to the handle drive shaft;
  A handle lever that is detachably attached to the handle insertion portion and rotates the ground disconnector, and a handle lever having a protrusion on the back surface,
  It is possible to move to two positions. At one position, when switching between one-phase grounding and three-phase grounding by the ground disconnector, it contacts the protrusion of the handle lever and restrains the movement of the handle lever. Switching between grounding and three-phase grounding is disabled, and the handle lever attached to the handle insertion part is rotated at the other position where the handle lever is removed from the handle insertion part and moved. A movable lever for stopper that enables switching between phase grounding and three-phase grounding;
  TheIt is characterized by providing.
[0015]
  Moreover, according to the invention which concerns on Claim 5,
  ClaimAny one of claims 1 to 4In the described switch,
  A steel wire that transmits the operation of the earthing disconnect switch operating unit to the shutter deviceIt is characterized by providing.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the switch of the present invention will be described with reference to the drawings.
First, the circuit system of the switch according to the present invention will be described.
FIG. 1 is an explanatory diagram of a switch according to the present embodiment. FIG. 1 (a) is an electrical connection diagram of a multi-circuit switch of three circuit examples, and FIG. 1 (b) is an explanatory diagram of a ground disconnector. is there.
The switch according to this embodiment includes a main circuit switch 1, a ground disconnector 2, a CT (current transformer) 3, and a PD (capacitor) 4.
[0021]
The main circuit switch 1 is configured to turn on and off the main circuit.
The ground disconnector 2 connects and separates the main circuit and the ground. The forward path is “OFF (ungrounded)” → “1-phase grounding” → “3-phase (all-phase) grounding” → “Maintenance” (Non-grounded) "and the reverse order of" Maintenance (Non-grounded) "->" 3-phase (All-phase) grounding "->" 1-phase grounding "->" Off (Non-grounded) " It can be grounded at.
[0022]
As shown in FIG. 1B, the ground movable contact point of the ground disconnector 2 is displayed in three stages, for convenience, off (non-ground), ground, and maintenance (non-ground). As described above, there are two stages of one-phase grounding and three-phase (all-phase) grounding. This one-phase grounding is grounding performed in advance for safety before the three-phase grounding.
[0023]
CT3 and PD4 which are sensors are attached to the main circuit in the switch, and CT3 detects the current of the main circuit, and PD4 detects the voltage of the main circuit.
The main circuit switch 1, the ground disconnector 2, CT 3 and PD 4 are housed in the gas case 5 for three circuits. The gas case 5 is filled with gas and insulated. Further, the gas case 5 is grounded to provide a housing ground, and the ground disconnector 2 and the PD 4 are grounded via the gas case 5 as is apparent from FIG.
[0024]
Next, the mechanism system of such a switch will be described.
2 is a partial front view of the switch according to the present embodiment, FIG. 3 is also a partial side view thereof, FIG. 4 is an operation explanatory diagram of the main circuit switch operation unit, and FIGS. 5, 6, and 7 are ground disconnectors. FIG. 8 is a main part circuit mechanism diagram for one circuit, and FIG. 9 is an operation explanatory diagram of the ground disconnector.
[0025]
First, the operation part of the switch will be described. As shown in FIGS. 2 and 3, the operation unit of the switch includes a main circuit switch operation unit 10 and a ground disconnection switch operation unit 20 roughly.
As shown in FIG. 2, the main circuit switch operation unit 10 includes an operation handle 11, a shutter device 12 as shown in FIG. 4, which is a specific example of the restraint unit of the present invention, an operation switch (not shown), and an illustration (not shown). A shutter device for an operation switch is provided.
[0026]
When the main circuit switch 1 (see FIG. 1) is operated using the main circuit switch operation unit 10, automatic or manual can be selected.
In the case of automatic operation, the operation handle 11 is positioned on the upper side (that is, the “automatic” position) as shown in FIGS. 2 and 3, and a closing operation is performed by an operation switch (not shown) such as an electronic switch. Cut into pieces.
In the case of manual operation, the main circuit switch 1 is turned off by the operation switch, and the operation handle 11 is manually operated in the direction of arrow A as shown in FIG.
[0027]
As shown in FIGS. 2 and 5A and 5B, the ground disconnector operating portion 20 includes a pointer 21 and a handle insertion portion 22. When operating the ground disconnector operating unit 20, the manual handle lever 23 is inserted into the handle insertion unit 22 and rotated as shown in FIGS. In addition, there is no other switch such as an electronic switch in the main circuit switch operation unit 10, and the grounding disconnector 2 shown in FIG. 1 can only be operated to connect and separate by operating the manual handle lever 23. It is.
[0028]
The main circuit switch operating unit 10 and the ground disconnect switch operating unit 20 are connected to the internal mechanism shown in FIG. 8 and drive the main circuit switch 1 and the ground disconnect switch 2.
First, the main circuit switch 1 will be described.
The main circuit switch 1 that is turned on and off by the main circuit switch operating unit 10 includes three main circuit movable contacts 1a and three main circuit fixed contacts 1b as shown in FIG. Open / close contacts for phase and W phase. FIG. 8 shows the main circuit switch 1 in the cut state.
[0029]
The three main circuit movable contacts 1 a are respectively connected to three levers 31, and the three levers 31 are further connected by a lever connecting plate 33 fixed to the main circuit opening / closing drive shaft 32.
In practice, a transmission mechanism is further included from the main circuit opening / closing drive shaft 32 to the main circuit movable contact 1a via a lever, a link, a pin, a livestock spring, a rod for connecting and driving the contact, and the like. Detailed description thereof is omitted for the sake of simplicity. These main circuit movable contacts 1a are connected to other circuits by buses, and the main circuit fixed contacts 1b are connected to an external bushing.
[0030]
The main circuit opening / closing drive shaft 32 reaches the operation mechanism section 34 shown in FIGS. 2 and 3, and is mechanically interlocked with the operation handle 11 by a transmission mechanism (not shown) in the operation mechanism section 34. Yes. When the operation handle 11 shown in FIG. 3 is rotated in the direction of arrow A, the main circuit opening / closing drive shaft 32 is rotated in the direction of arrow B in FIG. 8 and the main circuit movable contact is connected to the three main circuit fixed contacts 1b. 1a is turned on, and the main circuit switch 1 is turned on. Conversely, when the operation handle 11 is turned upward, the main circuit switch 1 is turned off.
[0031]
The operation mechanism unit 34 is also electrically connected to an operation switch (not shown). When the operation switch is turned on, the main circuit opening / closing drive shaft 32 is rotated by a drive unit such as a motor, and the main circuit switch. When 1 is turned on and the operation switch is turned off, the main circuit opening / closing drive shaft 32 is rotated by the drive unit and the main circuit switch 1 is turned off.
[0032]
Next, the ground disconnector 2 will be described.
As shown in FIG. 8, the ground disconnector 2 operated by the ground disconnector operating unit 20 includes three ground movable contacts 2a and three ground fixed contacts 2b. From the top, the U phase, V phase, W This is a phase disconnector. In FIG. 8, the grounding disconnector 2 in the case of non-grounding is shown.
[0033]
As shown in FIG. 8, the three ground fixed contacts 2b have a plate shape and are integrally fixed to the main circuit fixed contact 1b. The ground movable contact 2a is brought into contact with the ground fixed contact 2b to be in a ground state.
Note that the details of the transmission mechanism via a lever, a link, a pin, a livestock spring, a rod for connecting and driving the contact, etc., are omitted for both the ground movable contact 2a and the ground fixed contact 2b.
[0034]
As shown in FIG. 9, the grounding movable contact 2a rotates in a certain direction (for example, clockwise direction), and is in a non-grounding position, one phase (only V phase), a grounding position, and three phases (U, V, W all phases). It stops at the grounding position and the non-grounding position for maintenance. In response to these, the main circuit enters a grounded state, a one-phase grounded state, a three-phase grounded state, and a non-grounded state. As is apparent from FIG. 9, the V-phase ground fixed contact 2b is provided with a terminal whose connection surface protrudes from the other phase, so that one-phase grounding precedes.
[0035]
Next, the first and second interlock mechanisms will be described based on the operations of the main circuit switch 1 and the ground disconnector 2.
First, the first interlock mechanism will be described. In the first interlock mechanism, when the grounding disconnector 2 is one-phase grounding, three-phase grounding, or maintenance non-grounding, the main circuit switch operating unit 10 is prevented from being operated and the main circuit switch 1 is turned off. In addition, when the grounding disconnector 2 is turned off (not grounded), the main circuit switch 1 is released from being prevented from being operated and the main circuit switch 1 is turned on and off.
[0036]
The first interlock mechanism includes a handle insertion portion 22 (see FIGS. 2, 5 to 7), a handle drive shaft 41 (see FIG. 8) fixed integrally to the handle insertion portion 22, and the handle. A steel wire 42 that is attached to the drive shaft 41 and moves up and down in FIG. 8 by the rotation of the handle drive shaft 41, and the operation handle 11 (see FIGS. 2 to 4) by sliding the shutter according to the movement of the steel wire 42. ) Is provided with a shutter device 12 (see FIG. 4B).
[0037]
This steel wire 42 is specifically a stainless steel wire, and by connecting with a steel wire such as a stainless steel wire, there are less restrictions on wiring inside the switch, and the degree of freedom of the installation position of the shutter device 12 is reduced. There is an advantage that the constituent parts of the switch can be arranged appropriately and can be stored compactly.
[0038]
When the main circuit switch 1 is in the cut-off state, the ground disconnect switch operating unit 20 is not particularly limited, and the handle lever 23 fitted in the handle insertion part 22 can be freely rotated. As shown in FIG. 5A, when the grounding disconnector 2 is turned off (not grounded), the main circuit switch operating unit 10 can be turned on and off in order to enable the main circuit switch 1 to be turned on and off. ), The operation handle 11 can be rotated without being constrained. Although not shown, a shutter that restrains the front of the operation switch does not appear and can be turned on.
[0039]
The ground disconnector 2 is operated in such a state. Specifically, an operation as shown in FIGS. 5 to 7 is performed.
First, as shown in FIG. 5 (b), the manual handle lever 23 is inserted into the handle insertion portion 22, and the ground disconnector operating portion 20 is made operable as shown in FIG. 5 (a).
[0040]
Subsequently, when the handle lever 23 is rotated from the cutting (non-grounding) shown in FIG. 5A to the one-phase grounding shown in FIG. 6A, the first link 51 and the second link 52 shown in FIG. , And the separation drive shaft 53 rotates, and the operation rod 55 moves downward through the third link 54. Then, as shown in FIG. 9, the ground movable contact 2a moves from the non-ground position to the one-phase ground position. In this one-phase grounding, the contacts are not in contact in the U phase and the W phase, but the contacts are in contact in the V phase.
[0041]
When moving to the one-phase grounding, the steel wire 42 moves in the direction of arrow C (upward) by the rotation of the handle driving shaft 41 shown in FIG. As shown in b), the shutter is slid to restrain the rotation of the operation handle 11. Although not shown, a shutter appears on the front face of the operation switch to restrain the operation switch from being pressed.
As a result, the main circuit switch 1 is erroneously restrained so that it cannot be operated during one-phase grounding.
[0042]
Subsequently, when the handle lever 23 is rotated from the one-phase grounding shown in FIG. 6 (a) to the three-phase grounding shown in FIG. 7 (a), the rotational operation is intentionally limited. As shown in FIG. 6A, the handle lever 23 fitted to the handle insertion portion 22 includes a protrusion 24 provided on the back surface of the handle lever 23 (see FIG. 5B) and a stopper movable lever 25. Cannot be rotated as they are.
[0043]
Therefore, the handle lever 23 is once removed, the stopper movable lever 25 is rotated in the direction of arrow D in FIG. 6B to move to the handle lever passing position, and the handle lever 23 is attached again, and then FIG. As long as it is not rotated to the three-phase grounding shown in Fig. 5, the subsequent operation of the grounding disconnector 2 is prevented.
This is because the one-phase grounding state is surely discharged to the ground in a long time.
[0044]
When the three-phase grounding state is reached as shown in FIG. 7A, the grounding movable contact 2a is moved from the one-phase grounding position to the three-phase grounding position (FIG. 9) as shown in FIG. To the position of the grounding movable contact 2a represented by a solid line. In this three-phase grounding, the U-phase, V-phase, and W-phase are in contact with each other.
[0045]
When the ground disconnector 2 is moved from the one-phase ground (see FIG. 6 (a)) to the state shown by the three-phase ground (see FIG. 7 (a)), the steel wire 42 moves upward. However, the shutter device 12 maintains the state in which the shutter is slid as shown in FIG. 4B, and continues to restrain the rotation of the operation handle 11. Further, although not shown, the state where the shutter appears on the front face of the operation switch is maintained and the switch is kept so that the switch cannot be pressed.
[0046]
Subsequently, when the handle lever 23 is rotated from the three-phase grounding shown in FIG. 7A to the maintenance non-grounding shown in FIG. 7B, as shown in FIG. Move from the phase grounding position to non-grounding for maintenance. In this non-ground for maintenance, the contacts of U phase, V phase, and W phase are not in contact and are the same as non-ground, but the point of realizing the path of three-phase ground → non-ground is new. is there.
[0047]
When the ground disconnector 2 is moved from the three-phase grounding (see FIG. 7A) to the non-maintenance for maintenance (see FIG. 7B), the steel wire 42 moves upward. Also, the shutter device 12 maintains the state in which the shutter is slid as shown in FIG. 4B, and continues to restrain the rotation of the operation handle 11. Further, although not shown, the state where the shutter appears on the front face of the operation switch is maintained and the switch is kept so that the switch cannot be pressed.
[0048]
In addition, when the reverse path is followed and the ground disconnector 2 is set to non-maintenance for maintenance, three-phase grounding, and one-phase grounding, the shutter device 12 includes the operation handle 11 and the shutter 11 as shown in FIG. Although the operation switch 12 (not shown) is continuously restrained, the shutter device 12 becomes operable as shown in FIG. 4A in order to release the restraint of the operation when it is not grounded.
[0049]
Thus, the first interlock mechanism enables the main circuit switch 1 to be operated only when the ground disconnector 2 is in the “OFF” position (non-grounded), and the ground disconnector 2 is in a position other than the “OFF” position (1 In the case of phase grounding, three-phase grounding, and maintenance non-grounding), the main circuit switch 1 is restrained so that it cannot be operated. Remarkably reduced.
[0050]
In place of the shutter device 12, other stopper members or levers (not shown) may be engaged with the operation handle 11 to restrain the operation.
Further, although the steel wire 42 is used as the transmission means, it is needless to say that the steel wire 42 is not used. For example, depending on the position of the shutter device 12, the shutter device 12 may be connected via a transmission mechanism such as a link. And the ground disconnect switch operating unit 20 may be connected.
[0051]
Next, the second interlock mechanism will be described.
FIG. 10 is a configuration diagram of the second interlock mechanism, and FIGS. 11 and 12 are operation explanatory views of the second interlock mechanism.
The first interlock mechanism prevents the main circuit switch from being turned on / off except when the ground disconnector 2 is turned off (not grounded). However, in the second interlock mechanism, the main circuit switch 1 is turned on. Sometimes the operation of the earthing disconnect switch operating unit 20 is prevented and the earthing disconnector 2 is kept in a non-grounded state. When the main circuit switch 1 is turned off, the prevention of the operation of the earthing disconnector operating unit 20 is canceled and the earthing disconnector is disconnected. This is a mechanism that can prevent the main circuit switch 1 from being turned on and off when the earthing disconnector is one-phase grounding, three-phase grounding, and maintenance non-grounding.
[0052]
Such a 2nd interlock mechanism is provided with the induction | guidance | derivation metal fitting 61, the L-shaped latch 62, the cyclic | annular stopper 63, and the operation force generation part 64, as shown in FIGS.
As shown in FIGS. 10A and 10B, the guide fitting 61 is connected to a rotating handle drive shaft 41 and is rotated by driving from the ground disconnector operating unit 20. The guide fitting 61 has a claw portion 61a and a guide portion 61b.
The L-shaped latch 62 is rotated by a support shaft 62a, and has an engaging portion 62b that protrudes downward and a protruding pin 62c that protrudes toward the front of the drawing.
[0053]
As shown in FIG. 12, the annular stopper 63 uses the W-phase lever coupling plate 33 described above as the annular stopper 63, and is provided with a notch 63a. Note that the lever connecting plate 33 and the annular stopper 63 may be provided separately, but it is preferable that the lever connecting plate 33 and the annular stopper 63 are also used as in the present embodiment from the viewpoint that the mechanism system can be simplified.
As shown in FIG. 10, the operating force generator 64 includes a torsion coil spring 64a and a follower 64b.
[0054]
Next, the function of the second interlock mechanism will be described with the operation of the main circuit switch operation unit 10 and the ground disconnection switch operation unit 20 involved.
First, the function of maintaining the main circuit switch 1 in the disconnected state when the ground disconnector 2 is operated from the state in which the main circuit switch 1 is turned off and the grounding disconnector 2 is also ungrounded will be described.
[0055]
When the main circuit switch 1 is off and the grounding disconnector 2 is also ungrounded, the second interlock mechanism is in the state shown in FIGS. 10 (a), 10 (b) and 12 (a).
When the follower 64b urged by the torsion coil spring 64a is pressed toward the guide portion 61a provided in the guide fitting 61 in the axial direction, and the follower 64b of the guide portion 61b is located. As shown in FIGS. 5 to 7, the handle lever 23 is temporarily stopped, and it is prevented from rotating unless a large turning force is applied to the handle lever 23 from this state. In this case, the position of the valley portion of the guide portion 61b corresponds to the position of the ground movable contact 2a shown in FIG.
[0056]
The claw portion 61a of the guide fitting 61 and the protruding pin 62c of the L-shaped latch 62 are locked as shown in FIG.
The L-shaped latch 62 is also urged by the torsion coil spring so as to move in the direction of arrow E in FIG. 10B, but the claw portion 61a of the guide fitting 61 and the protruding pin 62c of the L-shaped latch 62 are provided. When locked, the L-shaped latch 62 stops at the position shown in FIG. This is the position of the L-shaped latch 62 when the ground disconnector 2 is not grounded.
[0057]
Now, when the handle lever of the ground disconnection switch operating unit 20 is turned to change from non-ground (see FIG. 5 (a)) to one-phase ground (see FIG. 6 (a)), the handle drive shaft 41 is guided metal fittings. 61 is rotated to rotate in the direction of arrow F so as to change from the state of FIG. 11A to the state of FIG. 11B (one-phase grounding, three-phase grounding, non-grounding for maintenance).
In this case, the protruding pin 62c in FIG. 11B moves while drawing a locus in the direction of the arrow G and is detached from the claw portion 61a, while the L-shaped latch 62 is lowered by the biasing force of the torsion coil spring. When the engaging portion 62b at the tip of the L-shaped latch 62 is lowered, the state changes from FIG. 12 (a) to FIG. 12 (b) and enters the notch 63a of the annular stopper 63. .
[0058]
When the engaging portion 62b enters the notch 63a, the main circuit opening / closing drive shaft 32 cannot be rotated, the operation handle 11 of the main circuit switch operating unit 10 is rotated, or an operation switch (not shown) is operated. Even if the key is pressed, the main circuit switch 1 cannot be turned on because the movement of the main circuit drive shaft remains constrained.
[0059]
Therefore, in the second interlock, the main circuit switch 1 is turned off, the grounding disconnector 2 is turned off, and the grounding switch 2 is turned on for one-phase grounding / three-phase grounding / maintenance non-grounding. When the handle lever 32 is operated so that the engagement portion 62b of the L-shaped latch 62 enters the notch portion 63a of the annular stopper 63 to prevent the main circuit opening / closing drive shaft 32 from rotating, Prevent the container 1 from being turned on and off.
[0060]
Next, other functions of the second interlock mechanism will be described.
In this case, when the main circuit switch 1 is turned on when the main circuit switch 1 is turned off and the grounding disconnector 2 is ungrounded, the function of preventing the operation of the grounding disconnector operation unit 20 is made.
[0061]
When the main circuit opening / closing drive shaft 32 is rotated so that the main circuit switch 1 is turned on, the annular stopper of the main circuit opening / closing drive shaft 32 becomes the state shown in FIGS. 12 (a) to 12 (c). The engaging portion 62b of the L-shaped latch 62 comes into contact with the annular stopper 63 so that the L-shaped latch 62 cannot be lowered (see FIG. 12B).
In this case, the protrusion pin 62c and the claw portion 61a are locked as shown in FIG. 10B, and even if the guide metal fitting 61 tries to rotate by operating the handle lever 23, the protrusion pin 62c and the claw portion 61a The lower side of the portion 61a is in contact with the guide metal fitting 61, that is, the operation of the guide metal fitting 61 is restricted and the handle lever 23 cannot be operated (the state shown in FIG. 5A is maintained). Become.
[0062]
Conversely, when the main circuit switching drive shaft 32 is rotated so as to cut the main circuit switch 1, the state shown in FIG. 12C is changed to FIG. 12A, and the notch 63 a of the annular stopper 63 has an L The engaging portion 62b of the L-shaped latch 62 can enter and the L-shaped latch 62 can be moved, and the protruding pin 62c can be moved while being detached from the claw portion 61a of the guiding bracket 61. The operation of the ground disconnect switch operating unit 20 is released and the ground disconnect switch 2 can be connected and separated.
The second interlock mechanism is as follows.
[0063]
As described above, since the switch according to the present embodiment is provided with the first interlock mechanism and the second interlock mechanism, it is possible to perform double interlocking, which may cause danger to maintenance and inspection workers. This is also prevented.
[0064]
Further, as described above with reference to the drawings, in the operation procedure of the grounding disconnector according to the present invention, the handle insertion part 22 for operating the grounding disconnector only at the time of switching between the one-phase grounding and the all-phase grounding. The handle lever 23 fitted to the rear surface of the handle lever 23 abuts the protrusion 24 provided on the back surface of the handle lever 23 and the stopper movable lever 25, temporarily removes and reattaches the handle lever 23, Unless it is rotated and moved to the handle lever passing position, subsequent operation of the ground disconnector is prevented.
After performing 1-phase grounding, these procedures are followed. Therefore, even if a ground fault occurs when 1-phase grounding occurs in the main circuit “ON” state, the substation breaker trips, and maintenance inspection is performed. The worst situation for workers can be avoided.
[0065]
Further, the ground disconnector 2 is switched in a certain direction (for example, clockwise as shown in FIG. 9) in the switching order of “OFF”, “1-phase grounding”, “3-phase (all phases) grounding”, and “non-grounding for maintenance”. Therefore, the main circuit is always in the maintenance non-ground state after the three-phase (all phases) ground state. When conducting a withstand voltage test with the main circuit ungrounded, an accident due to a wrong procedure such as switching the ground disconnector 2 at the same position as “maintenance” and “grounding” or “maintenance” position before “grounding” You can do it all.
[0066]
Thus, by providing a switch having not only the mechanism but also the first and second interlock mechanisms with protection means for the operation procedure and having a compact grounding disconnector, the operator can Maintenance, inspection, construction, etc. can be performed safely.
[0067]
【The invention's effect】
As described above, according to the present invention, when an operator performs maintenance, inspection, construction, etc., a situation in which the main circuit switch and the ground disconnector are erroneously connected to prevent danger to the worker is prevented. A switch can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a switch according to an embodiment of the present invention, in which FIG. 1 (a) is an electrical connection diagram of a multi-circuit switch of three circuit examples, and FIG. 1 (b) is an explanation of a ground disconnector. FIG.
FIG. 2 is a partial front view of the switch according to the embodiment of the present invention.
FIG. 3 is a partial side view of the switch according to the embodiment of the present invention.
FIG. 4 is an operation explanatory diagram of a main circuit switch operation unit of the switch according to the embodiment of the present invention.
FIG. 5 is an operation explanatory diagram of a ground disconnect switch operating portion of the switch according to the embodiment of the present invention.
FIG. 6 is an operation explanatory diagram of a ground disconnect switch operating portion of the switch according to the embodiment of the present invention.
FIG. 7 is an operation explanatory diagram of a grounding switch operating portion of the switch according to the embodiment of the present invention.
FIG. 8 is a main part circuit mechanism diagram of one circuit of the switch according to the embodiment of the present invention.
FIG. 9 is an operation explanatory diagram of the ground disconnector of the switch according to the embodiment of the present invention.
FIG. 10 is a configuration diagram of a second interlock mechanism of the switch according to the embodiment of the present invention.
FIG. 11 is an operation explanatory diagram of the second interlock mechanism of the switch according to the embodiment of the present invention.
FIG. 12 is an operation explanatory diagram of the second interlock mechanism of the switch according to the embodiment of the present invention.
FIG. 13 is a circuit diagram of a conventional switch.
[Explanation of symbols]
1 Main circuit switch
1a Main circuit movable contact
1b Main circuit fixed contact
2 Ground disconnector
2a Grounding movable contact
2b Fixed ground contact
3 CT
4 PD
5 Gas case
10 Main circuit switch operation section
11 Operation handle
12 Shutter device
20 Ground disconnect switch operating section
21 Guidelines
22 Handle insertion part
23 Handle lever
24 Protrusion
25 Movable lever for stopper
31 lever
32 Main circuit open / close drive shaft
33 Lever connecting plate
34 Operation mechanism
41 Handle drive shaft
42 Steel wire
51 First link
52 Second link
53 Separated drive shaft
54 Third link
55 Operation rod
61 Guide bracket
61a claws
61b Guide part
62 L-shaped latch
62a Support shaft
62b engaging part
62c Extrusion pin
63 Annular stopper
63a Notch
64 Operating force generator
64a Torsion coil spring
64b Follower

Claims

A main circuit switch that turns on and off the main circuit according to the turning operation of the operation handle;
A grounding disconnector that connects and disconnects the main circuit and the ground in four stages of non-grounding, one-phase grounding, three-phase grounding, and non-grounding for maintenance in accordance with the operation of the grounding disconnector operation unit,
There is a shutter device that slides the shutter according to the operation of the earthing disconnector operating section. When the earthing disconnector is one-phase grounding, three-phase grounding, or non-maintenance for maintenance, the shutter device rotates the operation handle. The main circuit switch is kept off by restricting the operation of the operation handle by sliding it so that it is positioned on the moving path. Also, when the grounding disconnector is not grounded, the shutter device rotates the shutter. A first interlock mechanism that allows the main circuit switch to be turned on and off by slidably moving it so that it is located outside the path,
A guide fitting connected to a handle drive shaft that is rotated by driving from the ground disconnector operating portion and having a claw portion, an L-shaped latch that is rotated by a shaft support and has an engaging portion and a protruding pin, An annular stopper including a notch and fixed to a main circuit switching drive shaft for turning on and off the circuit switch, and the main circuit switching from a state in which the main circuit switch is cut and the grounding disconnector is not grounded When the main circuit opening / closing drive shaft is rotated so that the device is inserted, the engaging portion of the L-shaped latch comes into contact with the annular stopper to restrain the operation of the L-shaped latch and the protruding pin of the L-shaped latch The grounding disconnector is kept ungrounded by contacting the claw part of the guiding bracket and restraining the operation of the guiding bracket to prevent the operation of the grounding disconnector operating unit connected to the guiding bracket. The device is cut off and the ground disconnector is not When the grounding disconnector is switched from ground to 1-phase grounding, 3-phase grounding, or non-maintenance for maintenance, the engaging portion of the L-shaped latch enters the notch of the annular stopper and the main circuit switching drive shaft rotates. A second interlock mechanism for keeping the main circuit switch off by preventing movement;
A switch characterized by comprising.

The switch according to claim 1, wherein
A handle insertion part fixed to the handle drive shaft;
A handle lever that is detachably attached to the handle insertion portion and rotates the ground disconnector, and a handle lever having a protrusion on the back surface,
It is possible to move to two positions. At one position, when switching between one-phase grounding and three-phase grounding by the ground disconnector, it contacts the protrusion of the handle lever and restrains the movement of the handle lever. Switching between grounding and three-phase grounding is disabled, and the handle lever attached to the handle insertion part is rotated at the other position where the handle lever is removed from the handle insertion part and moved. A movable lever for stopper that enables switching between phase grounding and three-phase grounding;
Switch, characterized in that it comprises a.

A main circuit switch that turns on and off the main circuit according to the operation of turning on the operation switch;
A grounding disconnector that connects and disconnects the main circuit and the ground in four stages of non-grounding, one-phase grounding, three-phase grounding, and non-grounding for maintenance in accordance with the operation of the grounding disconnector operation unit,
There is a shutter device that slides the shutter according to the operation of the earthing disconnector operating unit. When the earthing disconnector is one-phase grounding, three-phase grounding, or non-maintenance for maintenance, the shutter device puts the shutter in front of the operation switch. The main circuit switch is kept off by restraining the operation of the operation switch by sliding it so that it is positioned, and the shutter device is positioned outside the front face of the operation switch when the ground disconnector is not grounded. A first interlock mechanism that allows the main circuit switch to be freely turned on and off by sliding and moving the operation switch to release
A guide fitting connected to a handle drive shaft that is rotated by driving from the ground disconnector operating portion and having a claw portion, an L-shaped latch that is rotated by a shaft support and has an engaging portion and a protruding pin, An annular stopper including a notch and fixed to a main circuit switching drive shaft for turning on and off the circuit switch, and the main circuit switching from a state in which the main circuit switch is cut and the grounding disconnector is not grounded ejector pins of L-shaped latch with vessel engaging portion of L-shaped latch is rotated to the main circuit closing drive shaft so as to enter the annular stopper path to restrain the operation of the L-shaped latch abuts The earthing disconnector is kept ungrounded by abutting against the claw part of the induction fitting and restraining the operation of the induction fitting to prevent the operation of the earthing disconnection device operating part connected to the induction fitting. The switch is turned off and the grounding disconnector is not When the grounding disconnector is switched from ground to 1-phase grounding, 3-phase grounding, or non-maintenance for maintenance, the engaging portion of the L-shaped latch enters the notch of the annular stopper and the main circuit switching drive shaft rotates. A second interlock mechanism for keeping the main circuit switch off by preventing movement;
Switch, characterized in that it comprises a.

The switch according to claim 3,
A handle insertion part fixed to the handle drive shaft;
A handle lever that is detachably attached to the handle insertion portion and rotates the ground disconnector, and a handle lever having a protrusion on the back surface,
It is possible to move to two positions. At one position, when switching between one-phase grounding and three-phase grounding by the ground disconnector, it contacts the protrusion of the handle lever and restrains the movement of the handle lever. Switching between grounding and three-phase grounding is disabled, and the handle lever attached to the handle insertion part is rotated at the other position where the handle lever is removed from the handle insertion part and moved. A movable lever for stopper that enables switching between phase grounding and three-phase grounding;
Switch, characterized in that it comprises a.

In the switch according to any one of claims 1 to 4 ,
A switch comprising a steel wire for transmitting an operation of a ground disconnector operating portion to a shutter device .