JP3654874B2

JP3654874B2 - Oil dissolved gas extraction device

Info

Publication number: JP3654874B2
Application number: JP2002173590A
Authority: JP
Inventors: 敦彦柏野; 秀雄篠原; 大輔近藤
Original assignee: ティーエム・ティーアンドディー株式会社
Priority date: 2002-06-14
Filing date: 2002-06-14
Publication date: 2005-06-02
Anticipated expiration: 2022-06-14
Also published as: JP2004022692A

Description

【０００１】
【発明の属する技術分野】
この発明は、油入変圧器、油入リアクトルなどの油入電気機器に充填されている絶縁油中の溶存ガスを抽出してガス成分を分析する油中ガス分析装置に装備される油中溶存ガス抽出装置に関するものである。
【０００２】
【従来の技術】
油入電気機器の保守管理には、内部に使用されている絶縁材料および絶縁油は、使用中の温度による経年的熱劣化、内部の局部加熱による熱分解、あるいは局部的な電界集中による分解などによって、充填されている絶縁油中には種々の分解成分が溶存しており、絶縁油を定期的に採取し、溶存する分解成分を分析し、分解成分の種類とその量から、油入電気機器の異常を診断する方法が古くから採られている。
【０００３】
絶縁油中の溶存ガスは、油入電気機器から採取した絶縁油を減圧状態にして抽出する方法が一般的であり、その方法は、相応の時間と、適正に抽出するためには熟練を必要とするものであり、油入電気機器の油中ガス分析装置の油中溶存ガス抽出装置は、油中溶存ガスを効率よく、適正に抽出するために自動的に抽出する装置が実用されている。自動化された従来の油中溶存ガス抽出装置としては図５に示すものがある。
【０００４】
図５の油中溶存ガス抽出装置は、その溶存ガス抽出部分を抽出容器２の内径部に減圧空間２Ａを形成する減圧空間形成部材としてベローズ３を装備し、ベローズ３を伸縮できるように配置して周囲を密封し、ベローズ３の天井部を下降させることにより減圧空間２Ａが形成されるように構成し、抽出容器２の上部に絶縁油を噴出させるノズル７を取り付けた構成とし、ベローズ３の天井部は駆動軸４ａにより駆動モータ４と連結し、駆動モータ４によりベローズ３の天井部を下降することにより減圧空間２Ａが形成される。油入電気機器１の容器下方および上方の採油口１ａ、１ｂのそれぞれの端部に３方に連通する切換弁６ａ、６ｂを取り付け、切換弁６ａと抽出容器２の下方の間の途中には循環ポンプ８を配置した配管５ａにより連結し、切換弁６ｂと抽出タンク２の上方の間を配管５ｂで連結し、この配管５ｂの抽出容器２への入口部分に絶縁油を噴出するノズル７を設け、切換弁６ａと６ｂの相互間は配管５ｃで接続し、切換弁６ａ、６ｂを切り換えると抽出容器２、配管５ａ、５ｂ、５ｃのルートで循環路５が形成される。抽出容器２の上部に抽出バルブ９を取り付けた構成である。
【０００５】
このように構成された油中溶存ガス抽出装置による油中溶存ガスの抽出は、まず、抽出バルブ９から抽出容器２および配管５ａ、５ｂ、５ｃの内部に絶縁油を充満させて空気等の不純なガスを排出し、切換弁６ａ、６ｂを油入電気機器１と抽出容器２の間を連通させて一定時間循環させて絶縁油を注入し、続いて切換弁６ａ、６ｂの油入電気機器１との間を閉止し、抽出容器２、配管５ｃの方向に連通するように切換弁６ａ、６ｂを操作し、抽出容器２の下部から配管５ａ、５ｃ、５ｂを経由して抽出容器２の上部に至る循環路５を形成し、循環ポンプ８を運転して絶縁油を循環させ、駆動モータ４により駆動軸４ａを介してベローズ３の天井部を下降させて抽出容器２の内部に減圧空間２Ａを形成する。この状態において、絶縁油が循環して抽出容器２の上部のノズル７から減圧空間２内に噴出して減圧空間２Ａ内に溶存ガスが抽出される。抽出された油中溶存ガスは、抽出弁９からガス分析装置に送気されて、分解成分の分析に供される。
【０００６】
溶存ガスの抽出中は、減圧空間２Ａを一気に大きくすると、減圧空間２Ａの内圧が急激に低下するので、循環路５を形成する配管５ａ、５ｂ、５ｃ内にバブルが発生し、絶縁油の循環ができなくなることがあるので、減圧空間２Ａは絶縁油を循環させながら徐々に大きくすることが必要である。
【０００７】
図５のように構成した油中溶存ガス抽出装置は、油入電気機器１から絶縁油を採取する機能と、減圧空間２Ａに絶縁油を循環させる機能を有し、溶存ガスが短時間で安定して抽出できる。
【０００８】
【発明が解決しようとする課題】
一般に油入電気機器に充填された絶縁油とガス空間を触れさせないエアーシールセル方式の油入電気機器では、正常時の油中溶存ガス量は少ないので、減圧空間を形成して溶存ガスを抽出する場合は問題なく抽出できるが、窒素封入式油入電気機器の場合、あるいはエアーシールセル方式の場合であっても、内部に異常が存在する場合は溶存ガス量が多い場合がある。このような溶存ガス量が多い場合は、従来の図５の構成では、油流を検出する検出手段がないので、溶存ガス抽出中にバブルが発生して油流が途絶えることがあり、これに気づかずに抽出動作を続行すると、溶存ガスの抽出が不充分となる問題点があった。
【０００９】
この発明は上記問題点を解決するためになされたものであり、油入電気機器の絶縁油に多量の溶存ガスが含まれる場合であっても、溶存ガスが効率よく正確に抽出できる油中溶存ガス抽出装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
この発明の請求項１に係る油中溶存ガス抽出装置は、容器内に内容積を拡大する減圧空間形成部材を装備した抽出容器と、抽出容器の上部と下部の間を容器外部の経路で連通し、その経路に循環ポンプを配置し、抽出容器入口部分に絶縁油を噴出するノズルを備えた循環路と、減圧空間形成部材の高さを調整し減圧空間の容積を調整する駆動モータと、駆動モータを制御する制御装置とを備え、抽出容器内に油入電気機器内部の絶縁油を注入し、循環路に絶縁油を循環させながら上記駆動モータにより上記抽出容器内の減圧空間形成部材により所定の容積の減圧空間を形成して絶縁油中の溶存ガスを抽出する構成とし、その循環路に油流計を配置し、絶縁油を循環させながら、減圧空間を油流が検出されなくなる状態まで拡大した後、油流が検出される状態まで縮小して所定の時間保持する動作を最終段階の減圧空間容積になるまで繰り返して油中溶存ガスを抽出する構成としたものである。
【００１１】
この発明の請求項２に係る油中溶存ガス抽出装置は、容器内に内容積を拡大する減圧空間形成部材を装備した抽出容器と、抽出容器の上部と下部の間を容器外部の経路で連通し、その経路に循環ポンプを配置し、抽出容器入口部分に絶縁油を噴出するノズルを備えた循環路と、減圧空間形成部材の高さを調整し減圧空間の容積を調整する駆動モータと、駆動モータを制御する制御装置とを備え、抽出容器内に油入電気機器内部の絶縁油を注入し、上記循環路に絶縁油を循環させながら駆動モータにより上記抽出容器内の減圧空間形成部材により所定の容積の減圧空間を形成して上記絶縁油中の溶存ガスを抽出する構成の抽出容器内の絶縁油を加熱するヒータと、抽出容器に容器内油温を検出する温度計と、循環路に循環路油温を検出する温度計を配置し、絶縁油を循環させながら、減圧空間を抽出容器内油温と上記循環路油温の温度差が所定の範囲を越える状態まで拡大した後、抽出容器内油温と循環路油温の温度差が所定の範囲になるまで縮小して所定の時間保持する動作を最終段階の減圧空間容積になるまで繰り返して油中溶存ガスを抽出する構成としたものである。
【００１２】
この発明の請求項３に係る油中溶存ガス抽出装置は、容器内に内容積を拡大する減圧空間形成部材を装備した抽出容器と、抽出容器の上部と下部の間を容器外部の経路で連通し、その経路に循環ポンプを配置し、上記抽出容器入口部分に絶縁油を噴出するノズルを備えた循環路と、上記減圧空間形成部材の高さを調整し減圧空間の容積を調整する駆動モータと、該駆動モータを制御する制御装置とを備え、抽出容器内に油入電気機器内部の絶縁油を注入し、循環路に絶縁油を循環させながら駆動モータにより抽出容器内の減圧空間形成部材により所定の容積の減圧空間を形成して絶縁油中の溶存ガスを抽出する構成とし、抽出容器内に油入電気機器容器内部の絶縁油を注入し、絶縁油を循環路に循環させながら抽出容器内に減圧空間を形成して絶縁油中の溶存ガスを抽出するときの最終段階の減圧空間容積に対して、減圧空間容積を複数の段階を経て増加させ、段階ごとに減圧空間の容積と上記循環ポンプ動作時間の動作パターンを設定し、この設定した動作パターンにより溶存ガスを抽出する構成としたものである。
【００１３】
この発明の請求項４に係る油中溶存ガス抽出装置は、請求項３の構成の制御装置には、減圧空間設定の動作パターンを保存するメモリ部を備え、最終段階の減圧空間容積に対して、減圧空間容積を複数の段階を経て増加させ、段階ごとに減圧空間の容積とその容積での保持時間の動作パターンを設定して上記メモリ部に保存しておき、この保存した動作パターンにより油中溶存ガスを抽出する構成としたものである。
【００１４】
【発明の実施の形態】
実施の形態１．
実施の形態１の油中溶存ガス抽出装置の構成を図１に示す。実施の形態１は、絶縁油を注入後の油中溶存ガスの抽出を、循環路の油流を油流計により検出しながら減圧空間２Ａを順次に大きくし、最終的には所定の容積にまで大きくして抽出する構成したものである。図１において、油入電気機器１、抽出容器２、ベローズ３、駆動モータ４、駆動軸４ａ、配管５ａ、５ｂ、５ｃ、抽出容器２、配管５ａ、５ｂ、５ｃで形成される循環路５、切換弁６ａ、６ｂ、ノズル７、循環ポンプ８、抽出バルブ９は、従来の構成を示す図５と同一である。１２はポンプ８の出口側に配置した油流計、１３は油流計１２の信号である油流の有無を検出する検出回路、１４は油流の有無の油流計１２の動作信号によりベローズ３の高さを調整する駆動モータ４の動作条件を演算する演算処理部、１５は演算処理部１４の信号に基づいて駆動モータ４を制御する制御回路である。駆動モータ４の制御装置は検出回路１３と演算処理部１４と制御回路１５とで構成されている。
【００１５】
このように構成された油中溶存ガス抽出装置による油中溶存ガスの抽出は、絶縁油の注入および循環路の形成は、従来の構成の図５の場合と同様に行う。すなわち、抽出バルブ９から抽出容器２および配管５ａ、５ｂ、５ｃの内部を真空引きして空気等の不純なガスを排出し、切換弁６ａ、６ｂを開き、油入電気機器１と抽出容器２の間を連通して一定時間循環させて絶縁油を注入し、続いて切換弁６ａ、６ｂを抽出容器２と配管５ｃの方向に連通するように操作し、抽出容器２の下部、配管５ａ、５ｃ、５ｂ、抽出容器２の上部に至る循環路５を形成する。
【００１６】
次に、循環ポンプ８を運転し、油流計１２の動作信号を検出回路１３で受信し、演算処理部１４で処理し、減圧空間２Ａが拡大する方向に駆動モータ４を動作させ、油流計１２の動作が停止する位置まで拡大する。次いで、駆動モータ４を反対方向に動作させて、油流計１２の油流が検出される位置まで減圧空間２Ａを縮小し、油流が発生した状態で駆動モータ４を停止し、その状態で一定時間保持して絶縁油を循環する。一定時間経過後、減圧空間２Ａを拡大する方向に駆動モータ４を駆動して、減圧空間２Ａを油流計１２の油流信号が検出されなくなるまで拡大する。次に油流信号が検出されるまで駆動モータ４を減圧空間２Ａが縮小する方向に動作させ、油流信号が検出された時点で、一定時間保持する。この動作を減圧空間２Ａの容積が所定の容積になるまで繰り返す。減圧空間２Ａに抽出された油中溶存ガスは抽出バルブ９から油中ガス分析装置に送気してガス成分の分析が行われ、そのデータにより油入電気機器の異常状態の診断が行われる。
【００１７】
このように油中溶存ガス抽出装置を構成すると、溶存ガスの抽出が容易となり、抽出作業のバラツキが少なくなり、溶存ガスが短時間で安定して抽出できる。
【００１８】
実施の形態２．
実施の形態２の油中溶存ガス抽出装置の構成を図２に示す。実施の形態２は、抽出容器に注入した絶縁油を加熱し、抽出容器内の絶縁油の温度と循環路に循環する絶縁油の温度との温度差により油流の有無を検出して減圧空間の制御を行うものである。図２において、１〜９は従来の構成を示す図５と同一である。制御回路１５は実施の形態１の図１と同一である。２０は抽出容器２内部の絶縁油を所定の温度に加熱するヒータ、２１は抽出容器２内の絶縁油の温度を検出する温度計、２２は循環路５の絶縁油の温度を検出する温度計である。２３は温度計２１および温度計２２の検出温度が入力される検出回路、２４は絶縁油の温度差に基づいて駆動モータ４の動作信号を生成して出力する演算処理部である。駆動モータ４の制御装置は検出回路２３と演算処理部２４と制御回路１５とで構成されている。
【００１９】
このように構成された油中溶存ガス抽出装置による油中溶存ガスの抽出は、絶縁油の注入および循環路の形成は、従来の構成の図５の場合と同様に行う。油入電気機器１内に絶縁油を注入して実施形態１と同様に、抽出容器２の下部から配管５ａ、５ｃ、５ｂ、抽出容器２の上部に至る循環路５を形成する。
【００２０】
油流あり、油流なしの判定は、循環ポンプ８の運転状態において、油流が流れている場合には、温度計２１と温度計２２の温度差は小さく、油流がない場合は温度差が大きくなることにより油流の有無が検出できるものであり、温度計２１および温度計２２の温度を検出回路２３で検出し、演算処理部２４において、温度計２１と温度計２２が検出したそれぞれの温度の温度差を演算し、設定された温度差の範囲であれば油流ありと判定し、設定された温度差を越えている場合は油流なしと判定する。
【００２１】
油中溶存ガスの抽出は、まず、循環ポンプ８を運転し、抽出容器２の減圧空間２Ａが大きくなる方向に駆動モータ４を動作させ、温度計２１と温度計２２の温度差により、油流なしが検出されるまで減圧空間２Ａを拡大する。ついで、駆動モータ４を減圧空間２Ａが小さくなる方向に運転して、油流が検出されるまで減圧空間２Ａを縮小し、油流ありと検出された位置で駆動モータ４を停止して一定時間保持することにより、溶存ガスが抽出される。続いて減圧空間２Ａが大きくなる方向に駆動モータ４を油流なしが検出されるまで動作させ、次に減圧空間２Ａが縮小する方向に油流ありと検出されるまで駆動モータ４を動作させて停止して一定時間保持する。この動作を減圧空間２Ａの容積が設定した値となるまで繰り返して油中溶存ガスを抽出する。減圧空間２Ａに抽出された油中溶存ガスは、実施の形態１と同様に、抽出バルブ９から油中ガス分析装置に送気してガス成分の分析し、そのデータにより油入電気機器の異常状態の診断が行われる。
【００２２】
このように構成すると、実施の形態１と同様に、溶存ガスの抽出が容易となり、抽出作業のバラツキが少なくなり、溶存ガスが短時間で安定して抽出できる。
【００２３】
実施の形態３．
油入電気機器に充填された絶縁油は、その構造により油中溶存ガス量には差がある。例えば、温度変化に対する圧力変化を抑制するコンサベータの構成が、絶縁油と圧力抑制のためのガス室部分が直接接しないようにしたエアーシールセル方式の場合は、溶存ガスの量は少なく、絶縁油と封入ガスが直接接する窒素封入式の場合は、封入ガスが絶縁油中に溶解しているので溶存ガスの量は多くなっている。しかし、実際に使用されている油入電気機器の構成はその大半がエアーシールセル方式であり、封入ガスの絶縁油中への溶解量は少ないのが一般的である。したがって、いずれの方式であっても溶存ガスが抽出できるようにするには、減圧空間容積とその保持時間を設定した動作パターンは窒素封入方式を対象に設定しておくと大部分の油入電気機器の絶縁油中の溶存ガスの抽出に適用できる。
【００２４】
実施の形態３は、実際の油入電気機器の構造を踏まえて自動化できる構成としたものであり、絶縁油を注入後の油中溶存ガスの抽出は、減圧空間の最終段階の容積に対してその容積を複数の段階を経て増加させ、最終段階で所定の容積にして油中溶存ガスを抽出する動作パターンを予め設定し、この動作パターンにより抽出するものである。実施の形態３の油中溶存ガス抽出装置の構成を図３に示す。図４は減圧空間の容積を段階的に大きくする状況と溶存ガス抽出量の関係を示す曲線である。図３において、油入電気機器１、抽出容器２、減圧空間２Ａ、ベローズ３、駆動モータ４、駆動軸４ａ、配管５ａ、５ｂ、５ｃ、循環路５、切換弁６ａ、６ｂ、ノズル７、循環ポンプ８、抽出バルブ９は、従来の構成を示す図５と同一である。制御装置１５は実施の形態１の図１と同一である。３３は溶存ガスを抽出する場合の、段階的に設定する減圧空間２Ａの容積とその保持時間を設定した動作パターンを保存するメモリ部、３４はメモリ部３３に保存された動作パターンに基づいて駆動モータ４が動作する制御信号を生成する演算処理部である。駆動モータ４の制御装置はメモリ部３３と演算処理部３４と制御回路１５とで構成されている。
【００２５】
この構成では、段階的に設定した減圧空間２Ａの容積と循環ポンプ８の動作時間の動作パターンをメモリ部３３に保存し、油入電気機器１から絶縁油を注入して、減圧空間２Ａの容積を保存された動作パターンにより設定して一定時間保持する間に絶縁油を循環して油中溶存ガスを抽出する。
【００２６】
このように油中溶存ガスを動作パターンで抽出するようにすると、全自動で溶存ガスを抽出できる装置となり、実施の形態１または実施の形態２のように細かな操作を要しないで安定的に効率よく油中溶存ガスの抽出ができる。
【００２７】
【発明の効果】
この発明の請求項１に係る油中溶存ガス抽出装置は、抽出容器内に油入電気機器容器内部の絶縁油を注入し、絶縁油を循環路に循環させながら抽出容器内に減圧空間を形成して絶縁油中の溶存ガスを抽出する油中溶存ガス抽出装置の循環路に油流計を配置し、絶縁油を循環させながら、減圧空間を油流が検出されなくなる状態まで拡大した後、油流が検出される状態まで縮小して所定の時間保持する動作を最終段階の減圧空間容積になるまで繰り返して油中溶存ガスを抽出する構成としたので、溶存ガスの抽出が容易となり、抽出作業のバラツキが少なく、溶存ガスが短時間で安定して抽出できる。
【００２８】
この発明の請求項２に係る油中溶存ガス抽出装置は、抽出容器内に油入電気機器容器内部の絶縁油を注入し、絶縁油を循環路に循環させながら抽出容器内に減圧空間を形成して絶縁油中の溶存ガスを抽出する構成に抽出容器内の絶縁油を加熱するヒータと、抽出容器に容器内油温度を検出する温度計と、循環路に循環路油温を検出する温度計を配置し、絶縁油を循環させながら、減圧空間を抽出容器内油温と循環路油温の温度差が所定の範囲を越える状態まで拡大した後、温度差が所定の範囲になるまで縮小して所定の時間保持する動作を最終段階の減圧空間容積になるまで繰り返して油中溶存ガスを抽出する構成としたので、溶存ガスの抽出が容易となり、抽出作業のバラツキが少なく、溶存ガスが短時間で安定して抽出できる。
【００２９】
この発明の請求項３に係る油中溶存ガス抽出装置は、抽出容器内に油入電気機器容器内部の絶縁油を注入し、絶縁油を循環路に循環させながら抽出容器内に減圧空間を形成して絶縁油中の溶存ガスを抽出する油中溶存ガス抽出装置の最終段階の減圧空間容積に対して、減圧空間容積を複数の段階を経て増加させ、段階ごとに減圧空間の容積と循環ポンプ動作時間の動作パターンを予め設定し、この設定した動作パターンにより溶存ガスを抽出する構成としたので、細かな操作を要しないで安定的に効率よく油中溶存ガスの抽出ができる。
【００３０】
この発明の請求項４に係る油中溶存ガス抽出装置は、請求項３の構成に動作パターンを保存するメモリ部を加えた構成とし、最終段階の減圧空間容積に対して、減圧空間容積を複数の段階を経て増加させ、段階ごとに減圧空間の容積と上記循環ポンプ動作時間の動作パターンを上記メモリ部に保存し、保存した動作パターンにより油中溶存ガスを抽出する構成としたので、全自動で抽出され、細かな操作を要しないで安定的に効率よく油中溶存ガスの抽出ができる。
【図面の簡単な説明】
【図１】実施の形態１の油中溶存ガス抽出装置の構成図である。
【図２】実施の形態２の油中溶存ガス抽出装置の構成図である。
【図３】実施の形態３の油中溶存ガス抽出装置の構成図である。
【図４】減圧空間を段階的に大きくして油中溶存ガスを抽出する場合のポンプ動作時間と溶存ガスの抽出量の関係を示す図である。
【図５】従来の油中溶存ガスの抽出装置の構成図である。
【符号の説明】
１油入電気機器、２抽出容器、２Ａ減圧空間、３ベローズ、
４駆動モータ、５ａ，５ｂ，５ｃ配管、５循環路、６ａ，６ｂ切替弁、
７ノズル、８循環ポンプ、９抽出バルブ、１２油流計、
１３検出回路、１４演算処理部、１５制御回路、２０ヒータ、
２１，２２温度計、２３検出回路、２４演算処理部、３３メモリ部、
３４演算処理部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil-in-oil dissolved in an oil-in-gas analyzer that extracts gas dissolved in insulating oil filled in oil-filled electrical equipment such as oil-filled transformers and oil-filled reactors and analyzes gas components. The present invention relates to a gas extraction device.
[0002]
[Prior art]
For maintenance and management of oil-filled electrical equipment, the insulating materials and oil used inside are subject to aging thermal degradation due to the temperature during use, thermal decomposition due to local heating inside, or decomposition due to local electric field concentration, etc. As a result, various decomposition components are dissolved in the filled insulating oil, and the insulating oil is collected periodically, and the dissolved decomposition components are analyzed. A method for diagnosing device abnormality has been used for a long time.
[0003]
In general, the dissolved gas in insulating oil is extracted by extracting the insulating oil collected from oil-filled electrical equipment under reduced pressure, and this method requires a certain amount of time and skill to extract it properly. The oil-dissolved gas extractor of the oil-in-gas analyzer for oil-filled electrical equipment has been put to practical use in order to extract the dissolved gas in oil efficiently and properly. . As an automated conventional dissolved gas extraction apparatus in oil, there is one shown in FIG.
[0004]
The dissolved gas extraction apparatus in FIG. 5 is equipped with a bellows 3 as a decompression space forming member for forming a decompression space 2A in the inner diameter portion of the extraction vessel 2 and disposing the bellows 3 so that the bellows 3 can be expanded and contracted. The periphery of the bellows 3 is lowered and the ceiling portion of the bellows 3 is lowered so that the decompressed space 2A is formed. The nozzle 7 for injecting the insulating oil is attached to the upper portion of the extraction container 2, and the bellows 3 The ceiling portion is connected to the drive motor 4 by the drive shaft 4a, and the drive motor 4 descends the ceiling portion of the bellows 3 to form the decompression space 2A. Switching valves 6a and 6b communicating in three directions are attached to the respective ends of the oil collecting ports 1a and 1b below and above the oil-filled electrical device 1, and in the middle between the switching valve 6a and the bottom of the extraction container 2 A pipe 5a in which the circulation pump 8 is arranged is connected, the switching valve 6b and the upper part of the extraction tank 2 are connected by a pipe 5b, and a nozzle 7 for ejecting insulating oil to the inlet portion of the pipe 5b to the extraction container 2 is provided. The switching valves 6a and 6b are connected to each other by a pipe 5c. When the switching valves 6a and 6b are switched, the circulation path 5 is formed along the route of the extraction container 2, the pipes 5a, 5b, and 5c. The extraction valve 9 is attached to the upper part of the extraction container 2.
[0005]
Extraction of dissolved gas in oil by the apparatus for extracting dissolved gas in oil is performed by first filling the extraction container 2 and the pipes 5a, 5b, and 5c with insulating oil from the extraction valve 9 to impure air or the like. Gas is discharged, and the switching valves 6a and 6b are connected between the oil-filled electrical device 1 and the extraction container 2 and circulated for a certain period of time to inject insulating oil, and then the oil-filled electrical devices of the switch valves 6a and 6b. 1 is closed, the switching valves 6a and 6b are operated so as to communicate with the extraction container 2 and the pipe 5c, and the extraction container 2 is connected to the lower part of the extraction container 2 via the pipes 5a, 5c and 5b. A circulation path 5 leading to the upper part is formed, the circulating pump 8 is operated to circulate the insulating oil, the ceiling portion of the bellows 3 is lowered by the drive motor 4 via the drive shaft 4a, and the decompression space is formed inside the extraction container 2. 2A is formed. In this state, the insulating oil circulates and is ejected from the nozzle 7 at the top of the extraction container 2 into the decompression space 2 and the dissolved gas is extracted into the decompression space 2A. The extracted dissolved gas in oil is sent from the extraction valve 9 to the gas analyzer and used for analysis of the decomposition component.
[0006]
During extraction of the dissolved gas, if the decompression space 2A is enlarged at a stretch, the internal pressure of the decompression space 2A rapidly decreases, so bubbles are generated in the pipes 5a, 5b, 5c forming the circulation path 5, and the insulating oil is circulated. Therefore, the decompression space 2A needs to be gradually enlarged while circulating the insulating oil.
[0007]
The dissolved gas extraction apparatus configured as shown in FIG. 5 has a function of collecting insulating oil from the oil-filled electrical device 1 and a function of circulating the insulating oil in the decompression space 2A, so that the dissolved gas is stable in a short time. Can be extracted.
[0008]
[Problems to be solved by the invention]
In general, air-seal cell type oil-filled electrical equipment that does not allow contact between the insulating oil filled in the oil-filled electrical equipment and the gas space has a small amount of dissolved gas in oil under normal conditions, so a decompressed space is formed to extract the dissolved gas. In this case, extraction can be performed without any problem. However, even in the case of a nitrogen-filled oil-filled electrical device or in the case of an air seal cell system, the amount of dissolved gas may be large if there is an abnormality inside. In the case of such a large amount of dissolved gas, in the conventional configuration of FIG. 5, there is no detection means for detecting the oil flow, so bubbles may be generated during extraction of the dissolved gas and the oil flow may be interrupted. If the extraction operation is continued without being noticed, there is a problem that extraction of dissolved gas becomes insufficient.
[0009]
The present invention has been made to solve the above-described problems, and even when a large amount of dissolved gas is contained in the insulating oil of oil-filled electrical equipment, the dissolved gas can be efficiently and accurately extracted. An object is to provide a gas extraction device.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, an apparatus for extracting dissolved gas in oil communicates between an extraction container equipped with a decompression space forming member that expands the internal volume of the container, and a path outside the container between the upper part and the lower part of the extraction container. A circulation path provided with a circulation pump in the path, a circulation path provided with a nozzle for ejecting insulating oil to the extraction container inlet, a drive motor for adjusting the volume of the decompression space by adjusting the height of the decompression space forming member, A controller for controlling the drive motor, injecting insulating oil inside the oil-filled electrical device into the extraction container, and circulating the insulating oil in the circulation path by the decompression space forming member in the extraction container by the drive motor A configuration in which a decompressed space with a predetermined volume is formed to extract dissolved gas in insulating oil, and an oil flow meter is placed in the circulation path, and the oil flow is not detected in the decompressed space while circulating the insulating oil. After expanding to the oil flow And reduced to a state issued is repeated that the arrangement for extracting a dissolved gas in oil until a reduced pressure space volume of the final stage operation for a predetermined period of time.
[0011]
According to a second aspect of the present invention, there is provided an extraction device for dissolved gas in oil that communicates between an extraction container equipped with a decompression space forming member that expands the internal volume of the container, and a path outside the container between the upper and lower portions of the extraction container. A circulation path provided with a circulation pump in the path, a circulation path provided with a nozzle for ejecting insulating oil to the extraction container inlet, a drive motor for adjusting the volume of the decompression space by adjusting the height of the decompression space forming member, A control device for controlling the drive motor, injecting the insulating oil inside the oil-filled electrical device into the extraction container, and circulating the insulating oil in the circulation path by the drive motor by the decompression space forming member in the extraction container A heater for heating the insulating oil in the extraction container configured to extract a dissolved gas in the insulating oil by forming a decompression space of a predetermined volume, a thermometer for detecting the oil temperature in the container in the extraction container, and a circulation path Temperature to detect the oil temperature in the circuit While the insulating oil is circulated, the decompression space is expanded to a state where the temperature difference between the oil temperature in the extraction container and the circulation path oil temperature exceeds a predetermined range, and then the oil temperature in the extraction container and the circulation path oil temperature are increased. The operation of reducing the temperature difference until it reaches a predetermined range and holding it for a predetermined time is repeated until the final decompressed space volume is reached, and the dissolved gas in oil is extracted.
[0012]
According to a third aspect of the present invention, there is provided an extraction device for dissolved gas in oil, wherein an extraction container equipped with a decompression space forming member that expands the internal volume of the container, and the upper and lower portions of the extraction container communicate with each other through a path outside the container. And a drive motor for adjusting the volume of the decompression space by adjusting the height of the decompression space forming member by arranging a circulation pump in the passage and having a nozzle for ejecting insulating oil to the extraction container inlet portion. And a control device for controlling the drive motor, injecting insulating oil inside the oil-filled electrical device into the extraction container, and circulating the insulating oil in the circulation path, the decompression space forming member in the extraction container by the drive motor To form a decompression space with a predetermined volume to extract the dissolved gas in the insulating oil, inject the insulating oil inside the oil-filled electrical equipment container into the extraction container, and extract while circulating the insulating oil in the circulation path Form a decompression space in the container The decompression space volume is increased through a plurality of stages with respect to the decompression space volume of the final stage when extracting the dissolved gas in the insulating oil, and the operation pattern of the decompression space volume and the operation time of the circulation pump is determined for each stage. This is a configuration in which dissolved gas is extracted by the set operation pattern.
[0013]
According to a fourth aspect of the present invention, there is provided a device for extracting dissolved gas in oil, wherein the control device having the configuration of the third aspect includes a memory unit for storing an operation pattern for setting the reduced pressure space, The decompression space volume is increased through a plurality of stages, and the operation pattern of the decompression space volume and the retention time at each volume is set for each stage and stored in the memory unit. It is set as the structure which extracts middle dissolved gas.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 shows the configuration of the in-oil dissolved gas extraction apparatus according to the first embodiment. In the first embodiment, the decompression space 2A is sequentially enlarged while extracting the dissolved gas in the oil after injecting the insulating oil, while detecting the oil flow in the circulation path with an oil flow meter, and finally the predetermined volume is reached. It is configured to extract up to a maximum. In FIG. 1, an oil-filled electrical device 1, an extraction container 2, a bellows 3, a drive motor 4, a drive shaft 4 a, pipes 5 a, 5 b, 5 c, an extraction container 2, a circulation path 5 formed by the pipes 5 a, 5 b, 5 c, The switching valves 6a and 6b, the nozzle 7, the circulation pump 8, and the extraction valve 9 are the same as in FIG. 5 showing the conventional configuration. 12 is an oil flow meter arranged on the outlet side of the pump 8, 13 is a detection circuit for detecting the presence or absence of an oil flow, which is a signal of the oil flow meter 12, and 14 is a bellows based on an operation signal of the oil flow meter 12 for the presence or absence of an oil flow. An arithmetic processing unit 15 that calculates the operating condition of the drive motor 4 that adjusts the height 3, and 15 is a control circuit that controls the drive motor 4 based on a signal from the arithmetic processing unit 14. The control device for the drive motor 4 includes a detection circuit 13, an arithmetic processing unit 14, and a control circuit 15.
[0015]
Extraction of the dissolved gas in oil by the dissolved gas extraction apparatus configured as described above is performed in the same manner as in the case of FIG. That is, the extraction container 2 and the pipes 5a, 5b, and 5c are evacuated from the extraction valve 9 to discharge impure gas such as air, the switching valves 6a and 6b are opened, and the oil-filled electrical device 1 and the extraction container 2 are opened. The insulating oil is injected by circulating between them for a certain period of time, and then the switching valves 6a and 6b are operated so as to communicate in the direction of the extraction container 2 and the pipe 5c, the lower part of the extraction container 2, the pipe 5a, 5c, 5b, the circulation path 5 which reaches the upper part of the extraction container 2 is formed.
[0016]
Next, the circulating pump 8 is operated, the operation signal of the oil flow meter 12 is received by the detection circuit 13, processed by the arithmetic processing unit 14, and the drive motor 4 is operated in the direction in which the decompression space 2A is expanded, It expands to a position where the operation of the total 12 stops. Next, the drive motor 4 is operated in the opposite direction to reduce the decompression space 2A to a position where the oil flow of the oil flow meter 12 is detected, and the drive motor 4 is stopped in a state where the oil flow is generated. Hold the oil for a certain period to circulate the insulating oil. After a certain period of time, the drive motor 4 is driven in the direction of expanding the decompression space 2A, and the decompression space 2A is expanded until the oil flow signal of the oil flow meter 12 is not detected. Next, the drive motor 4 is operated in a direction in which the decompression space 2A is reduced until an oil flow signal is detected, and is held for a certain time when the oil flow signal is detected. This operation is repeated until the volume of the decompression space 2A reaches a predetermined volume. The dissolved gas in oil extracted into the decompression space 2A is sent from the extraction valve 9 to the in-oil gas analyzer and analyzed for gas components, and the abnormal state of the oil-filled electrical equipment is diagnosed based on the data.
[0017]
If the dissolved gas extraction apparatus in oil is configured as described above, the extraction of the dissolved gas is facilitated, the variation in the extraction operation is reduced, and the dissolved gas can be stably extracted in a short time.
[0018]
Embodiment 2. FIG.
FIG. 2 shows the configuration of the dissolved-in-oil gas extraction device of the second embodiment. In the second embodiment, the insulating oil injected into the extraction container is heated, and the presence or absence of an oil flow is detected based on the temperature difference between the temperature of the insulating oil in the extraction container and the temperature of the insulating oil circulating in the circulation path. The control is performed. 2, 1 to 9 are the same as those in FIG. 5 showing the conventional configuration. The control circuit 15 is the same as that shown in FIG. 20 is a heater that heats the insulating oil in the extraction container 2 to a predetermined temperature, 21 is a thermometer that detects the temperature of the insulating oil in the extraction container 2, and 22 is a thermometer that detects the temperature of the insulating oil in the circulation path 5. It is. Reference numeral 23 is a detection circuit to which the detected temperatures of the thermometer 21 and the thermometer 22 are input, and 24 is an arithmetic processing unit that generates and outputs an operation signal of the drive motor 4 based on the temperature difference of the insulating oil. The control device for the drive motor 4 includes a detection circuit 23, an arithmetic processing unit 24, and a control circuit 15.
[0019]
Extraction of the dissolved gas in oil by the dissolved gas extraction apparatus configured as described above is performed in the same manner as in the case of FIG. Insulating oil is injected into the oil-filled electrical device 1 to form the circulation path 5 from the lower part of the extraction container 2 to the pipes 5a, 5c, 5b and the upper part of the extraction container 2 as in the first embodiment.
[0020]
In the operation state of the circulation pump 8, whether there is an oil flow or no oil flow is determined when the oil flow is flowing, the temperature difference between the thermometer 21 and the thermometer 22 is small, and when there is no oil flow, the temperature difference. , The presence or absence of oil flow can be detected, the temperatures of the thermometer 21 and the thermometer 22 are detected by the detection circuit 23, and the thermometer 21 and the thermometer 22 are detected by the arithmetic processing unit 24, respectively. If the temperature difference is within the set temperature difference range, it is determined that there is an oil flow, and if it exceeds the set temperature difference, it is determined that there is no oil flow.
[0021]
To extract the dissolved gas in oil, first, the circulation pump 8 is operated, the drive motor 4 is operated in the direction in which the decompression space 2A of the extraction container 2 becomes larger, and the oil flow is caused by the temperature difference between the thermometer 21 and the thermometer 22. The decompression space 2A is expanded until none is detected. Next, the drive motor 4 is operated in a direction in which the decompression space 2A becomes smaller, the decompression space 2A is reduced until an oil flow is detected, and the drive motor 4 is stopped at a position where it is detected that there is an oil flow, for a predetermined time. By holding, dissolved gas is extracted. Subsequently, the drive motor 4 is operated in the direction in which the decompression space 2A is increased until no oil flow is detected, and then the drive motor 4 is operated in the direction in which the decompression space 2A is reduced until it is detected that there is an oil flow. Stop and hold for a certain time. This operation is repeated until the volume of the decompression space 2A reaches the set value, and the dissolved gas in oil is extracted. The oil-dissolved gas extracted into the decompression space 2A is sent to the oil-in-gas analyzer from the extraction valve 9 and analyzed for gas components, as in the first embodiment. A condition diagnosis is performed.
[0022]
If comprised in this way, extraction of dissolved gas becomes easy similarly to Embodiment 1, the variation of extraction operation will decrease, and dissolved gas can be extracted stably in a short time.
[0023]
Embodiment 3 FIG.
Insulating oil filled in oil-filled electrical equipment has a difference in the amount of dissolved gas in oil depending on its structure. For example, in the case of an air seal cell system in which the insulating oil and the gas chamber part for pressure suppression are not in direct contact with the conservator that suppresses the pressure change with respect to the temperature change, the amount of dissolved gas is small and the insulation In the case of a nitrogen-filled type in which the oil and the filled gas are in direct contact with each other, the amount of dissolved gas is large because the filled gas is dissolved in the insulating oil. However, most of the configurations of oil-filled electrical devices that are actually used are of the air seal cell type, and generally the amount of the dissolved gas in the insulating oil is small. Therefore, in order to enable the dissolved gas to be extracted by either method, the operation pattern that sets the decompression space volume and its retention time should be set to the nitrogen-filled method as the target, and most oil-filled electricity Applicable to extraction of dissolved gas in insulation oil of equipment.
[0024]
The third embodiment is configured to be automated based on the structure of an actual oil-filled electrical device, and the extraction of dissolved gas in the oil after injecting the insulating oil is performed with respect to the final volume of the decompression space. The volume is increased through a plurality of stages, and an operation pattern for extracting the dissolved gas in oil to a predetermined volume in the final stage is set in advance, and the operation pattern is extracted. FIG. 3 shows the configuration of the oil-dissolved gas extraction apparatus according to the third embodiment. FIG. 4 is a curve showing the relationship between the situation in which the volume of the decompression space is increased stepwise and the amount of extracted dissolved gas. In FIG. 3, oil-filled electrical device 1, extraction container 2, decompression space 2A, bellows 3, drive motor 4, drive shaft 4a, piping 5a, 5b, 5c, circulation path 5, switching valves 6a, 6b, nozzle 7, circulation The pump 8 and the extraction valve 9 are the same as in FIG. 5 showing the conventional configuration. The control device 15 is the same as FIG. 1 of the first embodiment. Reference numeral 33 denotes a memory unit for storing an operation pattern in which the volume of the decompression space 2A to be set in stages and the holding time thereof are set when extracting the dissolved gas, and 34 is driven based on the operation pattern stored in the memory unit 33 An arithmetic processing unit that generates a control signal for operating the motor 4. The control device for the drive motor 4 includes a memory unit 33, an arithmetic processing unit 34, and a control circuit 15.
[0025]
In this configuration, the volume of the decompression space 2A set in stages and the operation pattern of the operation time of the circulation pump 8 are stored in the memory unit 33, and insulating oil is injected from the oil-filled electrical device 1 so that the volume of the decompression space 2A is increased. Is set according to the stored operation pattern and the insulating oil is circulated to extract the dissolved gas in the oil while it is held for a certain time.
[0026]
If the dissolved gas in oil is extracted in the operation pattern in this way, it becomes a device that can extract the dissolved gas in a fully automatic manner, and stably without requiring a detailed operation as in the first or second embodiment. Extracts dissolved gas in oil efficiently.
[0027]
【The invention's effect】
According to a first aspect of the present invention, there is provided an apparatus for extracting dissolved gas in oil, in which an insulating oil in an oil-filled electrical equipment container is injected into an extraction container, and a decompression space is formed in the extraction container while circulating the insulating oil in a circulation path. After disposing the oil flow meter in the circulation path of the dissolved oil extraction device that extracts the dissolved gas in the insulating oil and circulating the insulating oil, the decompression space is expanded to a state where no oil flow is detected, The operation of reducing the oil flow to a state where it is detected and holding it for a predetermined time is repeated until the final decompression space volume is reached, so that the dissolved gas in the oil is extracted. There is little variation in work, and dissolved gas can be extracted stably in a short time.
[0028]
According to a second aspect of the present invention, there is provided a device for extracting dissolved gas in oil, in which an insulating oil in an oil-filled electrical device container is injected into the extraction container, and a decompression space is formed in the extraction container while circulating the insulating oil in the circulation path. The heater that heats the insulating oil in the extraction container to extract the dissolved gas in the insulating oil, the thermometer that detects the temperature of the oil in the container in the extraction container, and the temperature that detects the temperature of the circulating path oil in the circulation path Place the gauge and circulate the insulating oil, expand the decompression space to a state where the temperature difference between the oil temperature in the extraction container and the circulation path oil temperature exceeds the specified range, and then reduce until the temperature difference reaches the specified range. Then, the operation of holding for a predetermined time is repeated until the final decompression space volume is reached, so that the dissolved gas in the oil is extracted, so that the extraction of the dissolved gas becomes easy, the variation in the extraction operation is small, and the dissolved gas is reduced. It can be extracted stably in a short time.
[0029]
According to a third aspect of the present invention, there is provided an apparatus for extracting dissolved gas in oil, in which an insulating oil in an oil-filled electrical device container is injected into the extraction container, and a decompression space is formed in the extraction container while circulating the insulating oil in the circulation path. The decompression space volume is increased through a plurality of stages with respect to the decompression space volume of the final stage of the dissolved gas extraction apparatus for extracting dissolved gas in the insulating oil, and the volume of the decompression space and the circulation pump are increased for each stage. Since the operation pattern of the operation time is set in advance and the dissolved gas is extracted by the set operation pattern, the dissolved gas in oil can be extracted stably and efficiently without requiring a fine operation.
[0030]
According to a fourth aspect of the present invention, there is provided a device for extracting dissolved gas in oil having a configuration in which a memory unit for storing an operation pattern is added to the configuration of the third aspect. The volume of the decompression space and the operation pattern of the circulation pump operating time are stored in the memory unit for each stage, and the dissolved gas in oil is extracted by the stored operation pattern. Extraction of dissolved gas in oil can be performed stably and efficiently without the need for detailed operations.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a dissolved-in-oil gas extraction device according to a first embodiment.
FIG. 2 is a configuration diagram of an in-oil dissolved gas extraction device according to a second embodiment.
FIG. 3 is a configuration diagram of a dissolved-in-oil gas extraction device according to a third embodiment.
FIG. 4 is a diagram showing the relationship between the pump operation time and the amount of extracted dissolved gas when extracting the dissolved gas in oil by increasing the decompression space stepwise.
FIG. 5 is a configuration diagram of a conventional extraction device for dissolved gas in oil.
[Explanation of symbols]
1 Oil-filled electrical equipment, 2 extraction container, 2A decompression space, 3 bellows,
4 driving motor, 5a, 5b, 5c piping, 5 circulation path, 6a, 6b switching valve,
7 Nozzle, 8 Circulation pump, 9 Extraction valve, 12 Oil flow meter,
13 detection circuit, 14 arithmetic processing unit, 15 control circuit, 20 heater,
21, 22 thermometer, 23 detection circuit, 24 arithmetic processing unit, 33 memory unit,
34 Arithmetic processing part.

Claims

An extraction container equipped with a decompression space forming member that expands the internal volume in the container, and the upper and lower portions of the extraction container communicate with each other through a path outside the container, and a circulation pump is disposed in the path, and the extraction container inlet A circulation path provided with a nozzle for ejecting insulating oil in a part; a drive motor that adjusts the volume of the decompression space by changing the height of the decompression space forming member; and a control device that controls the drive motor; Insulating oil inside the oil-filled electrical device is poured into the extraction container, and a decompression space having a predetermined volume is formed by the decompression space forming member by the drive motor while circulating the insulation oil in the circulation path. In the oil dissolved gas extraction device for extracting dissolved gas in the oil, an oil flow meter is arranged in the circulation path, and the insulating oil is circulated and the decompressed space is expanded to a state where no oil flow is detected. Current is detected Until reduced to a predetermined time operation the final stage of pressure reduction is repeated until the space volume in the oil and extracting the dissolved gas in oil dissolved gas extraction device for holding.

An extraction container equipped with a decompression space forming member that expands the internal volume in the container, and the upper and lower portions of the extraction container communicate with each other through a path outside the container, and a circulation pump is disposed in the path, and the extraction container inlet A circulation path provided with a nozzle for ejecting insulating oil in a part; a drive motor that adjusts the volume of the decompression space by changing the height of the decompression space forming member; and a control device that controls the drive motor; Insulating oil inside the oil-filled electrical device is poured into the extraction container, and a decompression space having a predetermined volume is formed by the decompression space forming member by the drive motor while circulating the insulation oil in the circulation path. In the dissolved gas extraction apparatus for extracting dissolved gas in the oil, a heater for heating the insulating oil in the extraction container, a thermometer for detecting the oil temperature in the container in the extraction container, and a circulation path oil in the circulation path Temperature to detect temperature The pressure difference is expanded to a state where the temperature difference between the oil temperature in the extraction container and the circulation path oil temperature exceeds a predetermined range while circulating the insulating oil, and the temperature difference becomes a predetermined range. The oil-dissolved gas extraction apparatus extracts the gas dissolved in oil by repeating the operation of reducing to a predetermined time until the decompression space volume of the final stage is reached.

An extraction container equipped with a decompression space forming member that expands the internal volume in the container, and the upper and lower portions of the extraction container communicate with each other through a path outside the container, and a circulation pump is disposed in the path, and the extraction container inlet A circulation path provided with a nozzle for ejecting insulating oil in a part; a drive motor that adjusts the volume of the decompression space by changing the height of the decompression space forming member; and a control device that controls the drive motor; Insulating oil inside the oil-filled electrical device is poured into the extraction container, and a decompression space having a predetermined volume is formed by the decompression space forming member by the drive motor while circulating the insulation oil in the circulation path. In the oil-dissolved gas extraction device for extracting dissolved gas in the oil, the decompression space volume is increased through a plurality of stages with respect to the decompression space volume in the final stage, and the volume of the decompression space and the circulation pump operating time for each stage. of Set the work pattern, in oil dissolved gas extraction device and extracting the oil dissolved gas by to the set operating pattern.

The drive motor control device includes a memory unit that stores an operation pattern for setting the decompression space, and increases the decompression space volume through a plurality of stages with respect to the decompression space volume at the final stage. 4. The operation pattern of the volume of the gas and the retention time at the volume is set and stored in the memory unit, and the dissolved gas in the oil is extracted by the stored operation pattern. Dissolved gas extraction device.