200941531 九、發明說明 【發明所屬之技術領域】 本發明係關於真空開關裝置及其之真空壓力診斷方法 ，特別是關於，適合於具備在運轉中診斷真空閥內的真空 壓力之健全性的功能者之真空開關裝置及其之真空壓力診 斷方法。 ^ 【先前技術】 一般而言，真空開關裝置係於真空容器內部進行電極 的開關動作，真空容器內部的壓力（真空壓力）會對裝置 的耐電壓性能及斷電性能造成影響。第4圖係表示真空中 的放電特性之所謂的帕申曲線（Paschen curve)，表示將 電極間的真空絕緣間隙長設爲5mm時的壓力與放電開始電 壓的相關性。如該圖所示般，放電開始電壓係與真空壓力 有依存關係，由此瞭解到真空容器中之耐電壓性能及斷電 Q 性能係與真空壓力具有依存關係。因此，真空開關裝置爲 了保證彼等的性能’需要定期性針對真空壓力是否適當， 即真空壓力的健全性進行診斷。 此真空壓力的健全性診斷，係藉由將開關部運出配電 盤的外部後’對極間施加特定的高電壓，藉由閃絡之有無 來診斷真空壓力的健全性而進行健全性診斷。在此情形時 ’真空壓力診斷時’必須使裝置停電，且用以施加高電壓 的局電壓電源需要另外準備’診斷時的負擔增加。爲了不 使診斷時的負擔增加’以運轉中的診斷，即不使裝置停電 -5- 200941531 來進行診斷爲佳，作爲可此種診斷成爲可行之真空開關裝 置，例如有專利文獻1所記載者。 於專利文獻1記載有：和浮動電位的金屬容器相向來 配置真空壓力診斷用的量測端子，此量測端子係與前述金 屬容器一同地被模鑄於絕緣物內，該量測端子係與一方被 接地的電容器連接，將發生於該電容器的兩端之電壓藉由 比較器與事先設定好的臨界値比較，使用藉由以該比較器 的輸出來動作的繼電器接點來ΟΝ/OFF的警報燈，來診斷 真空壓力的健全性之真空開關裝置。 於前述裝置中，藉由診斷員定期診斷時辨識前述警報 燈，可以診斷真空壓力的健全性。 [專利文獻1]日本專利特開2007-80 594號公報 【發明內容】 [發明所欲解決之課題] 但是，關於配置在需要家庭附近之二次變電所（設置 於路旁之配電箱），真空開關裝置係被外箱所覆蓋，爲了 辨識前述裝置的警報燈，需要進入外箱的內部，難於診斷 真空壓力的健全性。 另外，觀看警報燈的機會，只限於數年進行1次的定 期診斷時。因此，真空壓力劣化，警報燈場期間持續點燈 之情形時，定期診斷時因警報燈本身劣化而故障，結果被 視爲真空壓力的劣化，恐有損真空壓力的診斷之可靠性。 因此，於如前述之裝置中，從故障保安思想的觀點而 -6- 200941531 言，必須藉由新設置反轉電路，使得訊號電壓健全時爲 ON、劣化時爲OFF，或設置警報燈診斷用的另外的電路， 來診斷警報燈的健全性，構造變得複雜，且成本不得不提 高。 本發明係有鑑於前述問題點，其第1目的在於提供： 可以簡單地進行真空壓力的健全性之診斷的真空開關裝置 〇 〇 另外，本發明的第2目的在於提供：可靠性提升，且 可以簡單地進行真空壓力的健全性之診斷的真空開關裝置 之真空壓力診斷方法。 [解決課題之手段] 本發明之真空開關裝置，爲了達成前述第1目的，係 具備：內部爲真空，且此內部具有由固定電極及可動電極 所形成的至少一對的主電路之浮動電位的金屬容器；及進 G 行前述可動電極之與固定電極的開關操作之操作機構；及 對前述主電路供給電力的主線；及將從前述主電路來之電 力供給至負載側之纜線，且將彼等收容於框體內所形成的 真空開關裝置，其特徵爲：於前述框體內，具備：連接手 段’該連接手段係可裝脫地連接有診斷前述金屬容器內的 真空壓力之真空壓力診斷手段。 另外，本發明之真空開關裝置之真空壓力診斷方法， 爲了達成前述第2目的，係於通過將從前述主電路來之電 力供給至負載側的負載側導體而被施加電壓的連接手段， 200941531 可裝脫地連接判別前述主電路是否被送電之診斷手段，藉 由該診斷手段，依據被施加於前述連接手段的電壓來判別 前述主電路是否被送電’來診斷該診斷手段的健全性，於 判別該診斷手段爲健全後，將前述診斷手段可裝脫地連接 於別的連接手段，藉由此診斷手段來診斷前述金屬容器內 的真空壓力的健全性。 [發明效果] 如依據本發明之真空開關裝置，可以簡單地進行真空 壓力的健全性之診斷。 另外，如依據本發明之真空壓力診斷方法，可靠性得 以提升’且可以簡單地進行真空壓力的健全性之診斷。 【實施方式】 以下’利用第1圖及第2圖來說明本發明之真空開關裝 置之實施例。 如第1及第2圖所示般，真空開關裝置1係由：開閉部 100、及設置於該開閉部100的上部，且進行該開閉部100 的電極之開關操作的操作機構3、及連接於前述開閉部100 ’且對該開閉部100供給電力的主線4、及連接於開閉部 100，且將來自該開閉部100的電力供給至負載側的纜線5 、及將此等收容於其內部的金屬製框體2槪略地構成。 前述之開閉部100係由：斷電器及斷路開閉器用之真 空閥101、及接地開閉器用之真空閥102、及連結該真空閥 -8 - 200941531 101與主線4之主線側導體112、及連接該主線側導體112與 主線4之襯套113、及連結真空閥101與纜線5之負載側導體 116、及連接該導體116與纜線5之襯套117、及一端連接於 負載側導體116之電壓檢測用電容器152所構成。 設置於開閉部100內之具有斷電及斷路功能的真空閥 101，係藉由：設定爲浮動電位之內部爲真空的金屬容器 12、及被收容於該金屬容器12的內部，相互相向，構成主 ❹ 電路之2對的固定電極110、114及可動電極120、121而槪 略地構成。固定電極110係被固定導體111的一端所支撐， 該固定導體11的另一端，係被連接於主線側導體112。可 動電極120係被可動導體122的一端所支撐，該可動導體 122的另一端，係連結於連結導體124的單側。另外，可動 電極121係被可動導體123的一端所支撐，該可動導體123 的另一端係被連結於前述的連結導體124的另一側。固定 電極114係被固定導體115的一端所支撐，該固定導體115 〇 的另一端係被連接於導體116。 於固定電極110與可動電極120及固定電極114與可動 電極121的周圍，個別配置有電弧遮蔽件119，該電弧遮蔽 件11 9係由覆蓋電極的周圍之絕緣性的陶瓷筒11 8所夾持。 陶瓷筒118係藉由電弧遮蔽件119，於可動電極的投入及斷 電時，防止來自電極所放出的電弧附著。另外，前述連結 導體124係介由陶瓷桿125而與操作桿126連結。於操作桿 126與金屬容器12之間，設置有一面維持真空狀態一面操 作操作機構3用之波紋管130，進而，操作桿126係突出至 200941531 真空閥101的外部，對於陶瓷桿125位於相反側的端部，係 藉由絕緣桿12 7被支撐，且與操作機構3連結。 如第2圖所示般，開閉部100的各部位及真空壓力診斷 用之導電性端子50，係藉由環氧樹脂等之絕緣物20而被模 鑄成爲一體，真空閥101與端子50係被相互絕緣。端子50 係位於金屬容器12的外部，與金屬容器12相向配置。另外 ，該絕緣物20的表面被施以導電塗裝21，該導電塗裝21係 被設爲接地電位。 另一方面，接地開閉用之真空閥102係由：絕緣性之 陶瓷筒140、及周圍藉由位於其之兩端的端子板141、142 所覆蓋之固定電極145、及與該固定電極145相向的可動電 極146槪略地構成》前述固定電極145係被固定導體143的 一端所支撐，固定導體143的另一端係被連接於導體116。 另外，前述可動電極146係介由波紋管148而由被端子板 141所支撐的可動導體141的一端所支撐，該可動導體144 ，其一部份係從陶瓷筒140及端子板141、142而突出於外 部。波紋管148係追隨可動導體144的動作，且藉由設置該 波紋管148可以將可動導體144與端子板141之間予以密閉 。於可動導體144中，和可動電極146被支撐者相反側的端 部，係與被設爲接地的連結導體149連結，該連結導體149 係藉由扣件150與絕緣桿151連接。該絕緣桿151係於其上 部和操作機構3連結。真空閥102內係藉由在真空爐中被高 溫軟銲，完成各部的接合。 與前述之電壓檢測用電容器152的導體1 16相反側之端 -10- 200941531 部，係被連接於電壓檢測用耦合電容器1001的一端，該電 壓檢測用耦合電容器1001的另一端係被接地。另外，於設 置於框體2之正面面板1 0 02設置有連接有用以判別前述主 電路是否被送電之診斷手段，且是真空開關裝置1中之外 部機器之插頭式電壓檢測器2000之連接插頭1003，該連接 插頭1 003係通過同軸配線1 004而與電壓檢測用耦合電容器 1001的兩端電性連接，成爲被施加有電壓檢測用耦合電容 Φ 器1001的電壓。電壓檢測器2000例如係由對於LED及連接 插頭1003可以插裝的端子所構成。 另一方面，與開閉部100的各部位模鑄爲一體的真空 壓力診斷用端子50，係位於金屬容器12的外部，且與金屬 容器12相向配置。此端子50係被收容於框體2的內部，介 由導體與另一端被接地的真空壓力診斷用電容器1005連接 。另外，該真空壓力診斷用電容器1005的兩端，係介由同 軸配線1007和設置於框體2的正面面板1002之連接插頭 ❹ 1006電性連接，成爲真空壓力診斷用電容器1005的電壓被 施加於連接插頭1006。此處，連接插頭1〇〇6係於前述之連 接插頭1003構造共通（相同構造），成爲可以裝脫地連接 於電壓檢測器2 0 0 0。 接著’說明設置於開閉部100內之接地開閉真空閥i 02 的開閉機構。藉由操作機構3，絕緣桿151在上下方向被驅 動’伴隨此動作，可動電極146也上下動作，來進行與固 定電極145的開閉操作。固定導體143係一端與導體116連 接，另外’基於連結導體149係被接地，藉由真空閥1〇2的 -11 - 200941531 投入動作，負載被接地。 此處，說明開閉部100內的電流之流動及動作機構。 藉由做成前述的構造，對於開閉部100而言，來自主線4之 電力係經由：襯套113-導體112-固定導體111-固定電極 110-可動電極120·可動導體12 2-連結導體124-可動導體 123-可動電極121-固定電極114·固定導體115-導體11 6-襯 套117之路徑而被通電，且介由纜線5而被供給至負載側。 藉由操作機構3，絕緣桿127被上下驅動，伴隨此動作，可 動電極120、121係移動至與固定電極110、114之間所形成 的進入位置Y0、切離位置Y1、斷路位置Y2之3位置，藉由 進入位置Y0-切離位置Y1間的操作，達成斷電功能，藉由 切離位置Y1-斷路位置Y2之操作，達成斷路功能。 以下，使用第3圖，說明使用前述之電壓檢測器20 0 0 ，來判別真空開關裝置1是否被送電及真空壓力之健全性 診斷的方法。 首先，開始將用以判別主電路是否被送電之外部機器 的電壓檢測器2000連接於連接手段之連接插頭1003 (符號 2 00 )。在導體1 16被送電的情形，電壓檢測用電容器152 與電壓檢測用耦合電容器1 00 1之間的電位，係與由電壓檢 測用電容器152的靜電電容C1 52與電壓檢測用耦合電容器 1001的靜電電容C1001所決定的系統電壓V對於對地電壓V/ /3 的分壓電壓 VI相等，Vl=V//"3xC152/(C152+C1001) 。因此，通過同軸配線1 004被電性連接，對於連接插頭 1 003施加了與分壓電壓VI成正比的電壓，電壓檢測器2000 200941531 如點燈，可以判別主電路爲被送電狀態，同時，診斷爲減 壓檢測器2000爲正常（符號204 )。另一方面，在電壓檢 測器2000不點燈的情形，查明可動電極120、121是否在閉 位置，如不在閉位置之情形，操作操作機構3，將可動電 極120、121投入閉位置，觀察電壓檢測器2000之點燈狀況 。在已經點燈的情形，診斷爲電壓檢測器2000是正常9符 號204 )。在不點燈的情形，或可動電極120、121已經在 φ 閉位置而不點燈之情形，診斷爲電壓檢測器2000爲故障（ 符號203 )，是否送去修理，或使用別的電壓檢測器2000 來進行同樣的步驟。 因此，藉由電壓檢測器2000之LED是否點燈，可以診 斷真空開關裝置1是否被送電之判別及電壓檢測器2000之 健全性（符號204 )。 接著，將電壓檢測器2000連接於連接手段之連接插頭 1 006 (符號205)。成爲浮動電位之金屬容器12與被接地 e 之導電塗裝21之間的靜電容量Cg，與真空閥101內的主電 路-金屬容器12間的靜電容量Cm相比，大很多（Cg>>Cm) ，因此，在真空壓力健全時，金屬容器12的電位與接地電 位幾乎相等。另一方面，真空壓力劣化，在真空閥101內 的主電路與金屬容器12之間產生放電的情形時，金屬容器 12的電位上升至系統電壓V的對地電壓V//· 3。即金屬容器 12與真空壓力診斷用端子50及真空壓力診斷用電容器1005 之間的電位，在真空壓力健全時，雖然幾乎等於接地電位 ，但是，真空壓力劣化，在主電路與金屬容器12之間產生 -13- 200941531 放電的情形時，成爲和端子50與金屬容器12之間的靜電容 量C0與真空壓力診斷用電容器1〇〇5的靜電容量C1005所決 定之對於系統電壓V的對地間電壓V/，3的分壓電壓V2 V2 = ¥/^3x00/(00+ C1005) 相等。 因此，成爲對於通過真空壓力診斷用電容器1005與同 軸配線1007被電性連接的連接插頭1006施加有和分壓電壓 V2成正比的電壓。在此情形時，電壓檢測器1〇〇〇如點燈， 可以診斷爲真空壓力健全（符號206 )，在不點燈的情形 時，可以診斷爲真空閥101內的真空壓力劣化（符號207) 。在被診斷爲真空壓力劣化之情形時，真空閥1 0 1或開閉 部100需要修理或更換。 此處，所求於前述的電壓檢測用電容器152的靜電容 量C152與電壓檢測用耦合電容器1〇〇1之靜電容量C1 001之 關係，係在將電壓檢測器2000的動作電壓設爲v時，至少 要滿足VI， (C1001/C152)S {(V/，3)-v}/v。 因此，電壓檢測用耦合電容器1001的靜電容量CIO 01 及電壓檢測用電容器152的靜電容量C152的比，如在系統 電壓V的I/，3與電壓檢測器2000的動作電壓v的差及電壓 檢測器2000的動作電壓之比以下，藉由將作爲診斷真空壓 力的診斷手段之電壓檢測器2000連接於可以裝脫地被連接 200941531 的連接插頭1006，能夠判別送電狀態之同時，也可以降低 警報燈的劣化、故障可能性。 另外，所求於前述的端子50與金屬容器12間的靜電容 量C0與真空壓力診斷用電容器1005之靜電容量C1005的關 係，也至少要滿足v$V2， (C1 005/C0)S {(V/，3)-v}/v。 因此，真空壓力診斷用電容器1005的靜電容量C1005 Q 及端子50與金屬容器12之間的靜電容量C0之比，如在電壓 檢測器2000的動作電壓v對於系統電壓v的1//*3與電壓檢 測器2000的動作電壓ν之差的比以下，藉由將作爲診斷真 空壓力的診斷手段之電壓檢測器2000連接於可以裝脫地被 連接的連接插頭1003，可以診斷真空壓力的健全性。 於本實施例中，雖將主電路的送電狀態的判別與利用 電壓檢測器20 00之真空壓力的健全性診斷當成一個步驟來 說明’但是，也可以只進行藉由電壓檢測器20 00之真空壓 〇 力的健全性診斷，可以使簡單地進行真空壓力的健全性診 斷成爲可能。 於本實施例中，係具備：與金屬容器12相向配置的端 子50;及介由導體，一端連接於該端子50，另一端被接地 的真空壓力診斷用電容器1 005;及通過同軸配線1007與該 真空壓力診斷用電容器1005電性連接，且可以裝脫地連接 有外部機器之電壓檢測器2000的連接插頭1006，於診斷時 ’藉由連接外部機器之電壓檢測器2000，可以診斷真空壓 力之健全性，可以簡單地進行診斷。另外，電壓檢測器 -15- 200941531 2000可以裝脫地被連接於連接插頭1006，於診斷後，帶 該電壓檢測器2000，對於別的真空開關裝置，也可以進 同樣的真空壓力之健全性診斷，能以1台來診斷複數個 空開關裝置，便利且具經濟性。 於本實施例中，雖於金屬容器12的外部，與該金屬 器12相向地配置端子50，但是，也可以使用導電構件來 替端子，於與金屬容器12之間產生靜電容量，可以進行 述的真空壓力之健全性診斷。 如依據本實施例，連接插頭1 0 03與前述的連接插 1006，其構造爲共通，在診斷真空壓力的健全性之前， 用電壓檢測器2000，可以事先判別真空開關裝置i是否 送電。除此之外，藉由該判別，也可以同時進行電壓檢 器20 00的健全性診斷。藉此，不需要用以診斷電壓檢測 2000本身的額外電路，或以訊號電壓健全時成爲on、 化時成爲OFF之方式而另外新特別設置反轉電路，不會 構造變得複雜或成本提高，能使真空壓力的健全性診斷 可靠性提高。 於本實施例中，開閉部100的各部位及真空壓力診 用端子50，係藉由環氧樹脂等之絕緣物20而被模鑄爲一 ’且表面被施以接地電位之導電塗裝21，作業時，即使 觸該絕緣物20，也可以確保作業人員的安全性。 於本實施例中，電壓檢測用耦合電容器1001及真空 力診斷用電容器1005的一端雖被接地，但是不一定要接 ’只要是比產生絕緣破壞之情形中的端子50更低的電位 著 行 真 容 代 前 頭 使 被 測 器 劣 使 之 斷 體 接 壓 地 200941531 且該電位爲已知，以使電壓V2成爲電壓檢測器2000的動作 電壓以上之方式，來選擇端子50與金屬容器12間的靜電容 量C0與真空壓力診斷用電容器1 005的靜電容量C 1 005，且 可以將電壓檢測器20 00連接於連接插頭1 006，能夠診斷真 空壓力的健全性。 於本實施例中，電壓檢測用電容器152及電壓檢測用 耦合電容器1001、真空壓力診斷用電容器1005，雖被做成 φ 收容於框體的內部，但是，例如即使是設置於框體的外部 ，也可以適用本診斷手法。 於本實施例中，連接手段雖設爲連接插頭1003及1006 ，但是，例如即使是螺絲固定等連接插頭以外，只要個別 的連接手段之構造爲共通，即使不設置用以診斷電壓檢測 器2000本身的額外電路，或使訊號電壓健全時成爲ON、 劣化時成爲OFF之方式的新的反轉電路，也可以判別真空 開關裝置1是否被送電，在判別電壓檢測器2000的健全性 〇 後，如進行真空壓力的健全性診斷，可以進行依據故障保 安思想之診斷。 因此，不使構造變得複雜或提高成本之情況下，可以 提高真空壓力的健全性診斷的可靠性。另外，在電壓檢測 器2000具有例如對於連接插頭1003、1006可以複數插裝之 端子的情形等，可以判別真空開關裝置1是否被送電，來 判別電壓檢測器2000的健全性之同時，如進行真空壓力的 健全性診斷，也可以進行依據故障保安思想之診斷。 於本實施例中，連接有診斷手段之電壓檢測器2000之 -17- 200941531 連接手段的連接插頭1003及1006，係被設置於框體2的正 面面板1 002，操作性及安全性雖獲得提升，但是，不限定 於框體2的正面面板，只要設置於藉由診斷人員從框體2的 外部可以連接電壓檢測器2000之診斷手段的位置，可以獲 得同樣的效果。 於本實施例中，介由同軸配線1007及1004，連接插頭 1003與真空壓力診斷用電容器1 005連接、連接插頭1006與 電壓檢測用耦合電容器1001連接，配線間距離在配線上的 任意位置爲相等，其結果，產生於電流流通之配線彼此的 靜電容量在配線上的任意位置成爲相等，只藉由真空壓力 診斷用電容器1005或電壓檢測用耦合電容器1001的靜電容 量’可以調整施加於連接插頭1003及連接插頭1006之電壓 値。 於本實施例中，進行送電狀態判別及真空壓力診斷之 手段的電壓檢測器2000，例如雖談到具備LED的情形，但 是，在LED以外’例如蜂鳴器等，依據施加於連接插頭 1 003及1 006之電壓，診斷人員可以辨識異常狀態者，當然 都可以。 【圖式簡單說明】 第1圖係表示本發明之實施例1的真空開關裝置之側剖 面圖。 第2圖係搭載於本發明的實施例丨之真空開關裝置的開 閉部之剖面圖。 -18- 200941531 第3圖係表示本發明之真空壓力診斷方法之流程圖 第4圖係表示壓力與放電開始電壓之關係的特性圖 【主要元件符號說明】 1:真空開關裝置，2:框體，3:操作機構，4: ’ 5:纜線，12:金屬容器，20:絕緣物，21 :導電 ’ 5〇:端子，100:開閉部，101、102:真空閥，1 〇 114 ··固定電極，111、115、143:固定導體，112、1 導體’117:襯套，118、140:陶瓷筒，119:電弧遮 ’ 120、121、146 ：可動電極，122、123、144 ：可動 ，124、149 :連結導體，125 :陶瓷桿，126 :操作 127、151 :絕緣桿，130、148 :波紋管，141 ' 142 : 板，1 5 0 :扣件，1 5 2 :電壓檢測用電容器，1 〇〇 1 :電 測用耦合電容器，1002:正面面板，1003、1006:連 頭，1004、1007:同軸配線，1005:真空壓力診斷用 ❹ 器’ 2000 :電壓檢測器。 主線 塗裝 10、 16 ： 蔽件 導體 桿， 端子 壓檢 接插 電容 -19-BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch device and a vacuum pressure diagnosing method thereof, and more particularly to a function suitable for diagnosing the soundness of a vacuum pressure in a vacuum valve during operation. Vacuum switch device and vacuum pressure diagnosis method thereof. ^ [Prior Art] Generally, the vacuum switch device is used to open and close the electrode inside the vacuum vessel. The pressure inside the vacuum vessel (vacuum pressure) affects the withstand voltage performance and power-off performance of the device. Fig. 4 is a so-called Paschen curve showing the discharge characteristics in a vacuum, and shows the correlation between the pressure at the time when the vacuum insulation gap length between the electrodes is 5 mm and the discharge start voltage. As shown in the figure, the discharge start voltage is dependent on the vacuum pressure, and it is understood that the withstand voltage performance and the power-off Q performance in the vacuum vessel are dependent on the vacuum pressure. Therefore, the vacuum switchgear is designed to ensure their performance. It is necessary to periodically diagnose whether the vacuum pressure is appropriate, that is, the soundness of the vacuum pressure. The soundness of the vacuum pressure is diagnosed by applying a specific high voltage between the electrodes after the switch unit is carried out of the power distribution panel, and the soundness of the vacuum pressure is diagnosed by the presence or absence of flashover. In this case, the 'vacuum pressure diagnosis' must be powered off, and the local voltage source for applying a high voltage needs to be additionally prepared to increase the burden at the time of diagnosis. In order to prevent a burden on the diagnosis, it is preferable to perform the diagnosis in the operation, that is, to prevent the power failure of the device from 5 to 200941531. . Patent Document 1 discloses that a measurement terminal for vacuum pressure diagnosis is disposed opposite to a metal container having a floating potential, and the measurement terminal is molded in an insulator together with the metal container, and the measurement terminal is One of the capacitors connected to the ground is connected, and the voltage across the capacitor is compared with a predetermined threshold by a comparator, and is ΟΝ/OFF using a relay contact that operates with the output of the comparator. A warning light, a vacuum switch device for diagnosing the soundness of vacuum pressure. In the foregoing apparatus, the soundness of the vacuum pressure can be diagnosed by recognizing the aforementioned warning lamp when the diagnostician periodically diagnoses. [Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-80 594. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] However, a secondary substation (a distribution box installed at a roadside) disposed near a home is required. The vacuum switch device is covered by the outer box. In order to recognize the alarm light of the device, it is necessary to enter the inside of the outer box, and it is difficult to diagnose the soundness of the vacuum pressure. In addition, the chance to view the warning light is limited to a regular diagnosis once a few years. Therefore, when the vacuum pressure is deteriorated and the lighting is continued during the warning light field, the warning lamp itself is deteriorated during the periodic diagnosis, and as a result, the vacuum pressure is deteriorated, which may impair the reliability of the diagnosis of the vacuum pressure. Therefore, in the above-described apparatus, from the viewpoint of the fail-safe thinking, -6-200941531, it is necessary to newly set the inverting circuit so that the signal voltage is ON when it is sound, OFF when it is degraded, or the warning lamp is set for diagnosis. The additional circuit to diagnose the soundness of the warning light, the construction becomes complicated, and the cost has to be increased. The present invention has been made in view of the above problems, and a first object thereof is to provide a vacuum switch device that can easily diagnose the soundness of a vacuum pressure, and a second object of the present invention is to provide reliability improvement and A vacuum pressure diagnosing method for a vacuum switch device that simply diagnoses the soundness of a vacuum pressure. [Means for Solving the Problem] In order to achieve the first object, the vacuum switch device of the present invention includes a vacuum inside, and has a floating potential of at least one pair of main circuits formed by a fixed electrode and a movable electrode. a metal container; and an operation mechanism for performing a switching operation of the movable electrode and the fixed electrode; and a main line for supplying power to the main circuit; and a cable for supplying power from the main circuit to the load side, and The vacuum switch device formed in the casing is characterized in that: the connecting body includes: a connecting means for attaching and detachably connecting a vacuum pressure diagnostic means for diagnosing a vacuum pressure in the metal container . In addition, the vacuum pressure diagnosing method of the vacuum switchgear according to the present invention is a connection means for applying a voltage by supplying electric power from the main circuit to the load side conductor on the load side in order to achieve the second object, 200941531. A diagnostic means for determining whether or not the main circuit is powered by the connection, and determining whether the main circuit is powered by the voltage applied to the connection means by the diagnostic means to diagnose the soundness of the diagnostic means After the diagnosis means is completed, the diagnostic means is detachably connected to another connection means, and the diagnostic means is used to diagnose the soundness of the vacuum pressure in the metal container. [Effect of the Invention] According to the vacuum switch device of the present invention, the diagnosis of the soundness of the vacuum pressure can be easily performed. Further, according to the vacuum pressure diagnosing method according to the present invention, the reliability is improved and the diagnosis of the soundness of the vacuum pressure can be easily performed. [Embodiment] Hereinafter, an embodiment of a vacuum switchgear according to the present invention will be described with reference to Figs. 1 and 2 . As shown in FIGS. 1 and 2, the vacuum switch device 1 includes an opening and closing unit 100, an operating mechanism 3 provided at an upper portion of the opening and closing unit 100, and an opening and closing operation of an electrode of the opening and closing unit 100, and a connection. a main line 4 for supplying electric power to the opening and closing unit 100 and a main line 4 for supplying power to the opening and closing unit 100, and a cable 5 for supplying electric power from the opening and closing unit 100 to the load side, and housing the same in the opening and closing unit 100 The inner metal frame 2 is configured in abbreviated manner. The opening and closing unit 100 includes a vacuum valve 101 for a breaker and a circuit breaker, a vacuum valve 102 for a grounding switch, and a main line side conductor 112 that connects the vacuum valve -8 - 200941531 101 to the main line 4, and the connection. The main line side conductor 112 and the bushing 113 of the main line 4, the load side conductor 116 connecting the vacuum valve 101 and the cable 5, and the bushing 117 connecting the conductor 116 and the cable 5, and one end thereof are connected to the load side conductor 116. The voltage detecting capacitor 152 is configured. The vacuum valve 101 having the power-off and disconnection functions provided in the opening and closing unit 100 is formed by a metal container 12 that is set to a vacuum inside and a vacuum chamber, and is housed in the inside of the metal container 12, and is configured to face each other. The two pairs of fixed electrodes 110 and 114 and the movable electrodes 120 and 121 of the main circuit are roughly configured. The fixed electrode 110 is supported by one end of the fixed conductor 111, and the other end of the fixed conductor 11 is connected to the main line side conductor 112. The movable electrode 120 is supported by one end of the movable conductor 122, and the other end of the movable conductor 122 is coupled to one side of the connecting conductor 124. Further, the movable electrode 121 is supported by one end of the movable conductor 123, and the other end of the movable conductor 123 is coupled to the other side of the above-described connecting conductor 124. The fixed electrode 114 is supported by one end of the fixed conductor 115, and the other end of the fixed conductor 115 is connected to the conductor 116. An arc shield 119 is disposed separately around the fixed electrode 110 and the movable electrode 120, and between the fixed electrode 114 and the movable electrode 121. The arc shield 11 is sandwiched by an insulating ceramic cylinder 11 8 covering the periphery of the electrode. . The ceramic cylinder 118 is prevented from adhering to the arc emitted from the electrode by the arc shield 119 when the movable electrode is turned on and off. Further, the connecting conductor 124 is coupled to the operating lever 126 via a ceramic rod 125. Between the operating lever 126 and the metal container 12, a bellows 130 for operating the operating mechanism 3 is provided while maintaining a vacuum state. Further, the operating lever 126 protrudes to the outside of the 200941531 vacuum valve 101, and the ceramic rod 125 is located on the opposite side. The end portion is supported by the insulating rod 127 and coupled to the operating mechanism 3. As shown in Fig. 2, each part of the opening and closing unit 100 and the conductive terminal 50 for vacuum pressure diagnosis are integrally molded by an insulator 20 such as an epoxy resin, and the vacuum valve 101 and the terminal 50 are connected. They are insulated from each other. The terminal 50 is located outside the metal container 12 and is disposed to face the metal container 12. Further, the surface of the insulator 20 is applied with a conductive coating 21 which is set to a ground potential. On the other hand, the vacuum valve 102 for grounding and closing is composed of an insulating ceramic cylinder 140, a fixed electrode 145 surrounded by terminal plates 141 and 142 at both ends thereof, and a facing electrode 145. The movable electrode 146 is configured to be succinctly configured. The fixed electrode 145 is supported by one end of the fixed conductor 143, and the other end of the fixed conductor 143 is connected to the conductor 116. Further, the movable electrode 146 is supported by one end of the movable conductor 141 supported by the terminal block 141 via a bellows 148, and a portion of the movable conductor 144 is from the ceramic cylinder 140 and the terminal plates 141, 142. Stand out from the outside. The bellows 148 follows the action of the movable conductor 144, and the movable conductor 144 and the terminal block 141 can be sealed by providing the bellows 148. The movable conductor 144 is connected to a connecting conductor 149 which is grounded to the end opposite to the movable electrode 146, and the connecting conductor 149 is connected to the insulating rod 151 by a fastener 150. The insulating rod 151 is coupled to the operating mechanism 3 at its upper portion. The vacuum valve 102 is joined by the high temperature soldering in the vacuum furnace to complete the joining of the parts. The end of the voltage detecting coupling capacitor 1001 is connected to one end of the voltage detecting capacitor 1001 on the opposite side of the conductor 164 of the voltage detecting capacitor 152, and the other end of the voltage detecting coupling capacitor 1001 is grounded. Further, a front side panel 10 02 provided in the casing 2 is provided with a connection means for connecting the diagnostic means for determining whether or not the main circuit is powered, and is a connection plug of the plug type voltage detector 2000 of the external device in the vacuum switch device 1. 1003, the connection plug 1 003 is electrically connected to both ends of the voltage detecting coupling capacitor 1001 via the coaxial wiring 1 004, and is a voltage to which the voltage detecting coupling capacitor Φ 1001 is applied. The voltage detector 2000 is constituted, for example, by a terminal that can be inserted into the LED and the connection plug 1003. On the other hand, the vacuum pressure diagnostic terminal 50 integrally molded with each portion of the opening and closing unit 100 is disposed outside the metal container 12 and disposed to face the metal container 12. The terminal 50 is housed inside the casing 2, and is connected to the vacuum pressure diagnostic capacitor 1005 whose ground is connected to the other end via a conductor. Further, both ends of the vacuum pressure diagnostic capacitor 1005 are electrically connected to the connection plug ❹ 1006 provided on the front panel 1002 of the housing 2 via the coaxial wiring 1007, and the voltage of the vacuum pressure diagnostic capacitor 1005 is applied to The plug 1006 is connected. Here, the connection plugs 1 to 6 are connected in common to the above-described connection plug 1003 (same structure), and are detachably connected to the voltage detector 2000. Next, the opening and closing mechanism of the ground opening and closing vacuum valve i 02 provided in the opening and closing unit 100 will be described. By the operation mechanism 3, the insulating rod 151 is driven in the vertical direction. With this operation, the movable electrode 146 also moves up and down to open and close the fixed electrode 145. The fixed conductor 143 is connected to the conductor 116 at one end, and is grounded by the connection conductor 149. The load is grounded by the operation of the vacuum valve 1〇2 -11 - 200941531. Here, the flow of the electric current in the opening and closing unit 100 and the operation mechanism will be described. With the above-described structure, the power from the main line 4 through the bushing 113-conductor 112-fixed conductor 111-fixed electrode 110-movable electrode 120·movable conductor 12 2-connected conductor 124 The path of the movable conductor 123 - the movable electrode 121 - the fixed electrode 114 · the fixed conductor 115 - the conductor 11 6 - the bushing 117 is energized, and is supplied to the load side via the cable 5. With the operation mechanism 3, the insulating rod 127 is driven up and down. With this operation, the movable electrodes 120 and 121 are moved to the entering position Y0, the cutting-off position Y1, and the breaking position Y2 formed between the fixed electrodes 110 and 114. The position is achieved by the operation between the entry position Y0 and the cut-off position Y1, and the power-off function is achieved, and the disconnection function is achieved by the operation of cutting off the position Y1 - the disconnection position Y2. Hereinafter, a method of determining whether or not the vacuum switch device 1 is powered and the vacuum pressure is diagnosed using the voltage detector 200 will be described using FIG. First, the voltage detector 2000 for determining the external device for determining whether or not the main circuit is powered is connected to the connection plug 1003 (symbol 2 00 ) of the connection means. When the conductor 164 is powered, the potential between the voltage detecting capacitor 152 and the voltage detecting coupling capacitor 10000 is the static electricity from the capacitance C1 52 of the voltage detecting capacitor 152 and the voltage detecting coupling capacitor 1001. The system voltage V determined by the capacitor C1001 is equal to the divided voltage VI to the ground voltage V/ /3, and Vl=V//" 3xC152/(C152+C1001). Therefore, the coaxial wiring 1 004 is electrically connected, and a voltage proportional to the divided voltage VI is applied to the connection plug 101. The voltage detector 2000 200941531 can be used to determine that the main circuit is being powered, and at the same time, diagnose. It is normal for the reduced pressure detector 2000 (symbol 204). On the other hand, when the voltage detector 2000 is not lit, it is ascertained whether or not the movable electrodes 120 and 121 are in the closed position. If the position is not in the closed position, the operation mechanism 3 is operated, and the movable electrodes 120 and 121 are put into the closed position to observe The lighting condition of the voltage detector 2000. In the case where the light has been turned on, it is diagnosed that the voltage detector 2000 is the normal 9 symbol 204). In the case where the light is not lit, or the movable electrodes 120, 121 are already in the φ closed position without lighting, it is diagnosed that the voltage detector 2000 is a malfunction (symbol 203), whether it is sent for repair, or another voltage detector is used. 2000 to carry out the same steps. Therefore, by whether or not the LED of the voltage detector 2000 is turned on, it is possible to diagnose whether or not the vacuum switch device 1 is powered and the soundness of the voltage detector 2000 (symbol 204). Next, the voltage detector 2000 is connected to the connection plug 1 006 (symbol 205) of the connection means. The electrostatic capacitance Cg between the metal container 12 that becomes the floating potential and the conductive coating 21 that is grounded e is much larger than the electrostatic capacitance Cm between the main circuit and the metal container 12 in the vacuum valve 101 (Cg >> Cm) Therefore, when the vacuum pressure is sound, the potential of the metal container 12 is almost equal to the ground potential. On the other hand, when the vacuum pressure is deteriorated and a discharge occurs between the main circuit in the vacuum valve 101 and the metal container 12, the potential of the metal container 12 rises to the ground voltage V//·3 of the system voltage V. In other words, the potential between the metal container 12 and the vacuum pressure diagnostic terminal 50 and the vacuum pressure diagnostic capacitor 1005 is almost equal to the ground potential when the vacuum pressure is sound, but the vacuum pressure is deteriorated between the main circuit and the metal container 12. When a discharge occurs in the period of -13,415,531, the voltage between the ground electrode 50 and the metal container 12 and the capacitance C1005 of the vacuum pressure diagnostic capacitor 1〇〇5 are determined as the ground voltage for the system voltage V. The divided voltage of V/, 3 is V2 V2 = ¥/^3x00/(00+ C1005) is equal. Therefore, a voltage proportional to the divided voltage V2 is applied to the connection plug 1006 that is electrically connected to the coaxial wiring 1007 by the vacuum pressure diagnostic capacitor 1005. In this case, the voltage detector 1 can be diagnosed as a vacuum pressure sound (symbol 206) if it is lit, and can be diagnosed as vacuum pressure deterioration in the vacuum valve 101 when the light is not lit (symbol 207). . When it is diagnosed that the vacuum pressure is deteriorated, the vacuum valve 1 0 1 or the opening and closing portion 100 needs to be repaired or replaced. Here, the relationship between the electrostatic capacitance C152 of the voltage detecting capacitor 152 and the electrostatic capacitance C1 001 of the voltage detecting coupling capacitor 1〇〇1 is obtained when the operating voltage of the voltage detector 2000 is v. At least meet VI, (C1001/C152)S {(V/,3)-v}/v. Therefore, the ratio of the capacitance CIO 01 of the voltage detecting coupling capacitor 1001 and the capacitance C152 of the voltage detecting capacitor 152 is the difference between the I/3 of the system voltage V and the operating voltage v of the voltage detector 2000, and the voltage detection. In the ratio of the operating voltage of the device 2000, the voltage detector 2000, which is a diagnostic means for diagnosing the vacuum pressure, is connected to the connection plug 1006 that can be detachably connected to the 200941531, so that the power transmission state can be determined and the warning light can be lowered. Deterioration, possibility of failure. Further, the relationship between the electrostatic capacitance C0 between the terminal 50 and the metal container 12 and the electrostatic capacitance C1005 of the vacuum pressure diagnostic capacitor 1005 is required to satisfy at least v$V2, (C1 005/C0)S {(V). /, 3)-v}/v. Therefore, the ratio of the electrostatic capacitance C1005 Q of the vacuum pressure diagnostic capacitor 1005 and the electrostatic capacitance C0 between the terminal 50 and the metal container 12 is, for example, 1//*3 of the operating voltage v of the voltage detector 2000 with respect to the system voltage v. In the ratio of the difference between the operating voltages ν of the voltage detectors 2000, the voltage detector 2000, which is a diagnostic means for diagnosing the vacuum pressure, is connected to the connection plug 1003 that can be detachably connected, whereby the soundness of the vacuum pressure can be diagnosed. In the present embodiment, the determination of the power transmission state of the main circuit and the soundness diagnosis of the vacuum pressure by the voltage detector 20 are regarded as one step. However, it is also possible to perform only the vacuum by the voltage detector 20 00. The soundness diagnosis of the compression force makes it possible to easily diagnose the soundness of the vacuum pressure. In the present embodiment, the terminal 50 is disposed to face the metal container 12, and the vacuum pressure diagnostic capacitor 1 005 is connected to the terminal 50 via one end of the conductor, and the other end is grounded; and the coaxial wiring 1007 is used. The vacuum pressure diagnostic capacitor 1005 is electrically connected, and the connection plug 1006 of the voltage detector 2000 of the external device can be detachably connected. When the diagnosis is performed, the vacuum pressure can be diagnosed by connecting the voltage detector 2000 of the external device. Soundness can be easily diagnosed. In addition, the voltage detector -15-200941531 2000 can be detachably connected to the connection plug 1006, and after the diagnosis, the voltage detector 2000 is provided, and for other vacuum switch devices, the same vacuum pressure can be diagnosed. It is convenient and economical to diagnose a plurality of empty switch devices with one unit. In the present embodiment, the terminal 50 is disposed on the outside of the metal container 12 so as to face the metal member 12. However, a conductive member may be used instead of the terminal to generate an electrostatic capacitance between the metal container 12 and the metal container 12. The soundness of the vacuum pressure is diagnosed. According to the present embodiment, the connection plug 102 and the aforementioned connection plug 1006 are configured to be common, and the voltage detector 2000 can be used to discriminate whether or not the vacuum switch device i is powered before the soundness of the vacuum pressure is diagnosed. In addition to this, the soundness diagnosis of the voltage detector 200 can be simultaneously performed by this discrimination. Therefore, an additional circuit for diagnosing the voltage detection 2000 itself is not required, or a reversal circuit is additionally provided in a manner that the signal voltage is turned on when the signal voltage is sound and is turned OFF, and the structure is not complicated or the cost is increased. The reliability of the diagnosis of the vacuum pressure can be improved. In the present embodiment, each portion of the opening and closing portion 100 and the vacuum pressure diagnostic terminal 50 are molded by the insulator 20 such as epoxy resin, and the surface is coated with a ground potential. At the time of operation, even if the insulator 20 is touched, the safety of the worker can be ensured. In the present embodiment, one end of the voltage detecting coupling capacitor 1001 and the vacuum force detecting capacitor 1005 is grounded, but it is not necessarily required to be connected as long as it is lower than the terminal 50 in the case where dielectric breakdown occurs. In the front of the generation, the test device is inferior to the body of the fuse 200903431 and the potential is known, so that the voltage V2 becomes above the operating voltage of the voltage detector 2000, the static electricity between the terminal 50 and the metal container 12 is selected. The capacitance C0 and the electrostatic capacitance C 1 005 of the vacuum pressure diagnostic capacitor 1 005 can be connected to the connection plug 1 006 by the voltage detector 20 00, and the soundness of the vacuum pressure can be diagnosed. In the present embodiment, the voltage detecting capacitor 152, the voltage detecting coupling capacitor 1001, and the vacuum pressure detecting capacitor 1005 are housed in the inside of the casing, but are provided, for example, on the outside of the casing. This diagnostic method can also be applied. In the present embodiment, although the connection means is provided as the connection plugs 1003 and 1006, for example, even if the connection plugs such as screws are fixed, the configuration of the individual connection means is common, even if the voltage detector 2000 itself is not provided for diagnosis. The additional circuit, or a new inverting circuit that turns ON when the signal voltage is sound and turns OFF when it is degraded, can determine whether or not the vacuum switch device 1 is powered, and after determining the soundness of the voltage detector 2000, The diagnosis of the soundness of the vacuum pressure can be performed based on the diagnosis of the fail-safe thinking. Therefore, the reliability of the soundness diagnosis of the vacuum pressure can be improved without complicating the structure or increasing the cost. Further, in the case where the voltage detector 2000 has, for example, a terminal in which the plugs 1003 and 1006 can be inserted in plural, it is possible to determine whether or not the vacuum switch device 1 is powered to determine the soundness of the voltage detector 2000, such as performing vacuum. The diagnosis of the soundness of the pressure can also be diagnosed based on the idea of fault security. In the present embodiment, the connection plugs 1003 and 1006 of the connection means -17-200941531 of the voltage detector 2000 to which the diagnostic means are connected are provided on the front panel 1 002 of the housing 2, and the operability and safety are improved. However, the front panel of the casing 2 is not limited, and the same effect can be obtained by providing a position at which the diagnostic means can connect the diagnostic means of the voltage detector 2000 from the outside of the casing 2. In the present embodiment, the connection plug 1003 is connected to the vacuum pressure diagnostic capacitor 1 005 via the coaxial wirings 1007 and 1004, and the connection plug 1006 is connected to the voltage detecting coupling capacitor 1001. The distance between the wirings is equal at any position on the wiring. As a result, the electrostatic capacitances of the wirings that flow in the current are equal to each other on the wiring, and can be adjusted only by the electrostatic capacitance of the vacuum pressure diagnostic capacitor 1005 or the voltage detecting coupling capacitor 1001 to the connection plug 1003. And the voltage of the connection plug 1006. In the present embodiment, the voltage detector 2000 that performs the power transmission state determination and the vacuum pressure diagnosis means that, for example, the LED is provided, but other than the LED, for example, a buzzer or the like is applied to the connection plug 1 003. And the voltage of 1 006, the diagnostic personnel can identify the abnormal state, of course. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side cross-sectional view showing a vacuum switchgear according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing the opening and closing portion of the vacuum switchgear of the embodiment of the present invention. -18- 200941531 Fig. 3 is a flow chart showing the vacuum pressure diagnosing method of the present invention. Fig. 4 is a characteristic diagram showing the relationship between the pressure and the discharge starting voltage. [Main component symbol description] 1: Vacuum switching device, 2: Frame , 3: operating mechanism, 4: '5: cable, 12: metal container, 20: insulation, 21: conductive '5〇: terminal, 100: opening and closing, 101, 102: vacuum valve, 1 〇 114 ·· Fixed electrode, 111, 115, 143: fixed conductor, 112, 1 conductor '117: bushing, 118, 140: ceramic cylinder, 119: arc shield '120, 121, 146: movable electrode, 122, 123, 144: movable , 124, 149 : connecting conductor, 125 : ceramic rod, 126 : operation 127, 151 : insulating rod, 130, 148 : bellows, 141 ' 142 : plate, 1 5 0 : fastener, 1 5 2 : for voltage detection Capacitor, 1 〇〇1: Coupling capacitor for electrical measurement, 1002: front panel, 1003, 1006: nipple, 1004, 1007: coaxial wiring, 1005: vacuum pressure diagnostic ' '2000: voltage detector. Main line painting 10, 16 : cover member conductor rod, terminal pressure check plug-in capacitor -19-