JP2005015825A - Cathodic protection management device for pipeline, cathodic protection management program, and cathodic protection management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify the cause for deterioration in cathodic protection conditions and to quickly and effectively devise its countermeasure by grasping the cathodic protection conditions from the relation with the laying conditions of each line or with the installing conditions of cathodic protection facilities, . <P>SOLUTION: The cathodic protection management device 10 is provided with: a measuring data file 11 where measured data are conserved one by one; a facility operation data file 12 where facility operation data are conserved one by one; a line information database 13 where line information on a pipeline, map information on the periphery thereof or the like are updated at any time and are stored; a facility information database 14 where facility information on cathodic protection facilities arranged per line of the pipeline is updated at any time and are stored; a judgement treatment part 20 where the fact that the quality of the protection conditions is normal or defective is judged; a countermeasure indication part 21 where required countermeasure indication is output based on the measured data; a line management part 22 where the soundness of the pipeline per line is confirmed from the line distribution in the measured data; a system registration part 15 where the measured data managed by the line management part 22 are registered; a facility control part 23 where the cathodic protection facilities are controlled based on the countermeasure indication from the countermeasure indication part 21; and a facility monitoring part 24 where the operating conditions of the cathodic protection facilities are monitored. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００５４】
そして、取得した（Ｉ_ＤＣ，Ｉ_ＡＣ）の全てがカソード防食管理基準を満たす（領域Ｉ，ＩＩ内である）場合、今回の判定処理が対策施行後であれば（Ｓ２０５）、対策施行の効果が確認できたものとして、この路線をシステム登録し（Ｓ２０６）、対策施行後で無い場合には、路線管理部２０の処理に移行する。また、取得した（Ｉ_ＤＣ，Ｉ_ＡＣ）の中でカソード防食管理基準を満たさないものがある場合には、前述の不合格領域（領域ＩＩＩ〜Ｖ）の何れに該当するか確認し（Ｓ２０４Ｄ）、対策指示部２１の処理に移行する（Ｓ２０４）。
【００５５】
図７は、対策指示部２１の機能を示す処理フローである。対策指示部２１では、先ず、判定処理部２０でカソード防食管理基準を満たさない（不良）と判定された計測データ（Ｉ_ＤＣ，Ｉ_ＡＣ）に基づいて、その計測地点と計測時点を対策対象計測地点Ｔｎｘ，対策対象計測時点Ｄｎｘとして取得する（Ｓ２１１）。具体的には、対象路線でカソード防食管理基準を満たしていない計測データが得られたターミナルボックスの番号とその計測時刻が取得されることになる。
【００５６】
そして、取得された対策対象計測地点Ｔｎｘ，対策対象計測時点Ｄｎｘによって、少なくとも施設稼働データファイル１２，路線情報データベース１３，施設情報データベース１４のいずれか又は複数から検索条件を抽出する（Ｓ２１２）。すなわち、取得されたターミナルボックスの番号とその計測時刻に基づいて、路線情報データベース１３からはそのターミナルボックス及びその周辺の路線情報（ターミナルボックス位置，ターミナルボックス周辺での電気鉄道路線の有無等）、施設情報データベース１４からはターミナルボックス周辺のカソード防食施設の有無（外部電源の有無等）、施設稼働データファイル１２からはカソード防食施設が有る場合に前述の計測時刻での施設稼働データの大小、等の情報を検索条件として抽出する。
【００５７】
この抽出された検索条件によって対策指示テーブルを検索することによって（Ｓ２１３）、必要な対策指示事項を出力表示装置２５に出力する（Ｓ２１４）。対策指示テーブルの一例を図８に示す。この対策指示テーブルは、「不合格領域」（計測データ（Ｉ_ＤＣ，Ｉ_ＡＣ）がカソード防食管理基準の不合格領域ＩＩＩ〜Ｖの何れに当たるか）、「路線情報」（路線情報データベース１３から抽出される条件事項）、「施設情報」（施設情報データベース１４から抽出される条件事項）、「施設稼働状況」（施設稼働データファイル１２から抽出される条件事項）からなる検索条件に対策指示事項を対応させた表であって、検索条件の各条件事項に該当する場合は「１」、該当しない場合は「０」を配した検索式に対して特定の対策指示事項が対応するようになっている。具体的に説明すると、一つの計測データのプローブ流入直流電流密度Ｉ_ＤＣが不足して不合格領域のＩＩＩに該当し、他の計測データの中には不合格領域に該当するデータが無く、施設情報として外部電源の存在有り（ｂ１）に該当し、施設稼働状況として稼働レベル小（ｃ１）に該当する場合には、「外部電源の出力電流増大」（Ａ１）の対策指示事項が検索されるようになっている。
【００５８】
図９は、路線管理部２２の機能を示す処理フローである。判定処理部２０で全ての計測データ（Ｉ_ＤＣ，Ｉ_ＡＣ）がカソード防食管理基準を満たしていると判定された場合には路線管理部２２に移行する。路線管理部２２では、前述の判定処理部２０で選択された一つの路線に対して、計測データファイル１１からプローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓを計測地点及び計測時点毎のデータとして取得し（Ｓ２２１）、この取得された計測データと路線情報データベースに記憶されている路線情報からプローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓの路線分布を作成し、この路線分布を計測時点毎に路線管理データベース１５に保存する（Ｓ２２２）。そして、保存された現在又は過去の路線分布に基づいて選択された路線における健全性を評価する（Ｓ２２３）。健全性が確認された場合には各路線毎にシステム登録する（Ｓ２２４）。路線分布は必要に応じて出力表示装置２５に表示することができる。
【００５９】
図１０は、路線分布によるパイプラインの健全性評価の一例を示すものである。ここで示す路線分布は、路線距離に対するプローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓの変動分布によって表される。ここで、単一路線の全域でプローブの設置されたターミナルボックスが存在する場合は、プローブオン電位Ｅ_ＯＮのみによって路線分布を作成することができるが、プローブが設置されていない計測地点が存在する場合には、プローブオン電位Ｅ_ＯＮと管対地電位Ｅ_Ｐ／Ｓが混在した路線分布であっても良い。この路線分布で評価される重要な管理事項は、メタルタッチの有無である。図示のように、特定計測地点Ｌ１のプローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓをその両隣の計測地点での計測データと比較してその差ΔＥ１又はΔＥ２を求め、これが基準値（例えば、５０ｍＶ）以上であって、その特定計測地点Ｌ１の計測データがプラス側にシフトしているような特異点がある場合には、その特定計測地点近くにメタルタッチが存在する可能性が高いといえる。このような特異点が存在しないことを確認してパイプラインの健全性を評価することができる。
【００６０】
図１１は、施設制御部２３の機能を示す処理フローである。カソード防食施設は、外部電源，強制排流器又は選択排流器のように常時監視が必要な施設を含み、このような施設から送られる施設稼働データは常時施設稼働データファイルに保存されることになる。施設制御部２３は、このような施設の施設稼働データに基づいて、各施設の稼働状態を制御するものである。これによると、先ず、施設稼働データファイル１２から常時監視施設の施設稼働データを随時取得する（Ｓ２３１）。そして、これを随時基準値と比較して（Ｓ２３２）、基準値に対して適正な出力が得られるように制御信号を出力する（Ｓ２３３）。
【００６１】
図１２は、施設監視部２４の機能を示すフローである。前述した外部電源，強制排流器又は選択排流器のように常時監視が必要な施設に対して、施設稼働データに基づいて各施設の稼働状態を監視し、稼働状態が悪化した場合に警告を発するものである。これによると、先ず、施設稼働データファイル１２から常時監視施設の施設稼働データを随時取得する（Ｓ２４１）。そして、これを随時設定された閾値と比較して（Ｓ２４２）、施設稼働データが設定された閾値を超えた場合に警告を表示する（Ｓ２４３）。また、この施設監視部２４によって遠隔地にあるカソード防食施設の稼働状況を常時モニタすることができる（Ｓ２４４）。
【００６２】
このようなシステム構成を備えたカソード防食管理装置１０においては、前述した計測データファイル１１及び施設稼働データファイル１２を装置内のメモリ等に形成して、入力部から入力された各データを逐次保存するようにしても良いし、ＨＤＤ等の外部記憶装置内に計測データファイル１１及び施設稼働データファイル１２を形成して装置本体と接続するようにしても良い。また、データ読み取り装置を備えたカソード防食管理装置１０に、計測データファイル１１及び施設稼働データファイル１２が形成されたＦＤ，ＭＯ，ＤＶＤ等の記録媒体を供給するようにしてもよい。また、路線情報データベース１３，施設情報データベース１４は装置内の記憶装置に形成しても良いし、装置外或いは遠隔地に設けた記憶装置に形成しても良い。ここでは、路線情報データベース１３と施設情報データベース１４を異なるデータベースとしているが、これらを一体のデータベースとして管理してもよい。
【００６３】
そして、このカソード防食管理装置１０は前述の機能を備えた構成部品によって形成される専用装置であっても良いし、データ保存手段、データ処理手段、処理結果の出力手段を有する汎用コンピュータに、前述した各部の機能を持たせるプログラムをインストールしたものであっても良い。この場合には、前述した各部の機能を示した処理フローがそのプログラムの実行フローに該当することになり、前述の各部の説明はプログラムの実行に伴う機能に該当する。
【００６４】
図１３は、前述したカソード防食管理装置１０によるカソード防食管理システムを説明する説明図である。管理対象のパイプライン１には、所定の区間毎にターミナルボックスＴＢ１，ＴＢ２，ＴＢ３，ＴＢ４が配設されている。そして、各ターミナルボックス内にはパイプライン１に対するカソード防食状況を計測する計測手段が設置されている。図示の例では、ターミナルボックスＴＢ１〜ＴＢ３内には、図１に示したようなパイプライン１，プローブ２，照合電極３間の導線にモニタ装置５を接続した計測手段が設置され、プローブ流入直流電流密度Ｉ_ＤＣ，プローブ交流電流密度Ｉ_ＡＣ，プローブオフ電位Ｅ_ＯＦＦ，プローブオン電位Ｅ_ＯＮが計測されており、ターミナルボックスＴＢ４には、パイプライン１，照合電極３間の導線に高感度電圧計７を接続した計測手段が設置され、管対地電位Ｅ_Ｐ／Ｓが計測されている。
【００６５】
また、パイプライン１の周辺には、電力の高圧交流架空送電線３０や直流電気鉄道４０のレール４１，電車線４２，変電所４３等の電食原因施設が存在していることを想定して、各種のカソード防食施設が配備されている。カソード防食施設としては、常時監視が必要な外部電源５０，強制排流器５１，選択排流器５２といった施設が配備されると共に、鋼製ケーシング等の低接地物５３又は犠牲陽極５４とパイプライン１との間に接続される保安回路５５、或いはアース電極５６が配備されている。
【００６６】
ここで、前述した計測手段とカソード防食施設は、カソード防食管理装置１０とオンライン又はオフラインで接続されており、計測データ，施設稼働データ又は制御信号の授受が可能な構成になっている。以下には、計測手段及びカソード防食施設がカソード防食管理装置１０と有線又は無線のオンラインで接続されている実施例について説明するが、本発明の実施形態は特にこれに限定されるものではない。
【００６７】
計測手段であるモニタ装置５又は高感度電圧計７には、計測データを特定の計測時点毎に送信する送信機が設けられ、カソード防食管理装置１０側には送信された計測データを受信する受信機が設けられている。そして受信した計測データが随時計測データファイル１１に保存されることは前述したとおりである。
【００６８】
また、前述した各カソード防食施設に関しては、常時監視が必要な施設には送受信機が設けられ、それに対応してカソード防食管理装置１０側にも送受信機が設けられている。例えば、外部電源５０は、送受信機によって、出力電流のモニタデータを施設稼働データとしてカソード防食管理装置１０側に送信すると共に、カソード防食管理装置１０側から送られてくる制御信号を受信して出力電流の調整が可能な調整手段が設けられている。強制排流器５１又は選択排流器５２には、出力側の導線中に電流計と排流電流の調整手段になる可変抵抗器を備えたモニタ制御装置５７が設けられ、モニタされた排流電流の計測データがカソード防食管理装置１０側に送信され、カソード防食管理装置１０側からの制御信号によって可変抵抗器が駆動して排流電流の調整が可能なようになっている。
【００６９】
保安回路５５は、一例として図１４に示す回路構成を備える。保安回路５５は、パイプライン１側に接続された導線６１Ａと鋼製ケーシング等の低接地物５３又は犠牲陽極５４側に接続された導線６１Ｂの間に接続される電源が不要な回路であって、導線６１Ａ，６１Ｂ間に、過大電流流入時に回路を遮断するヒューズ６２とサージ吸収素子（サージアブソーバ）６３と第１の逆流防止用ダイオード６４とが直列に接続され、このサージ吸収素子６３及び第１の逆流防止用ダイオード６４に並列して、高周波数電流に対して高抵抗素子となるコイル６５と第２の逆流防止用ダイオード６６が直列に接続されている。そして、この第２の逆流防止用ダイオード６６に並列して、非極性容量回路７０が接続されている。
【００７０】
第１の逆流防止用ダイオード６４と第２の逆流防止用ダイオード６６は、パイプライン１から低接地物５３又は犠牲陽極５４へ向かう直流電流に対して順方向に設置されるものであって、パイプライン１から低接地物５３又は犠牲陽極５４へ向かう直流電流に対して、両者の電位差に応じて導通させ、その逆方向の直流電流に対しては、その流れを遮断して絶縁状態を維持するものである。
【００７１】
非極性容量回路７０は、低周波数の交流誘導電圧を低減させる電気容量を備える回路であって、複数のコンデンサ７１〜７４の個々の電気容量によって、パイプライン１のプローブ交流電流密度がカソード防食管理基準内になるような電気容量が設定されている。また、複数のコンデンサ７１〜７４は、極性方向が一致したコンデンサ７１，７３とそれらとは極性方向が逆のコンデンサ７２，７４とからなり、コンデンサ７１とコンデンサ７２の組からなるコンデンサ列と、コンデンサ７３とコンデンサ７４の組からなるコンデンサ列は、それぞれ極板極性の同極が相対するように結線されている。また、極性方向が同じコンデンサ同士（コンデンサ７１とコンデンサ７３、コンデンサ７２とコンデンサ７４）は並列接続されている。そして、コンデンサ７１，７３に電流を供給するために、ダイオード７５がコンデンサ７２，７４と並列して設けられており、また、コンデンサ７２，７４に電流を供給するように前述のダイオード７５とは方向性が異なるダイオード７６が、コンデンサ７１，７３と並列して設けられている。更には、コンデンサ７１，７３に並列してサージ吸収素子７７が、コンデンサ７２，７３に並列してサージ吸収素子７８がそれぞれ接続されている。
【００７２】
このような保安回路５５によると、パイプライン１が受ける交流誘導電圧を効果的に低減することができ、高周波成分を含む広い周波数帯域の雷電流に対する衝撃保護に対処することができると共に、カソード防食が効かない自然腐食状況下においてもパイプライン１に腐食を誘起させない回路を実現できる。このような保安回路５５においては、電流モニタリング回路８０を第２の逆流防止用ダイオード６６に直列に設け、このモニタリングデータを送信機によって施設稼働データとしてカソード防食管理装置１０側に送信し、施設稼働データとして施設稼働データファイル１２に保存する。
【００７３】
以下に、このようなカソード防食管理装置１０又はそれを用いたカソード防食管理システムを用いたパイプラインの管理について例示する。
【００７４】
（定期点検によるデータ取得）
パイプラインの管理は、通常一定期間毎に行われる定期点検により行われる。前述したカソード防食管理装置１０は、定期点検の実行管理部を付属的に備えていても良く、これによると、定期点検の期日に応じて指示が出され、それに応じて計測データ及び施設稼働データの取得が行われる。１回の定期点検では、これを一つの計測時点として、管理地域内の複数路線における全ての計測地点（ターミナルボックス）から計測データを取得する。計測データ及び施設稼働データは前述したようにオンライン又は記録媒体を介したオフラインでカソード防食管理装置１０に入力され、計測データファイル１１及び施設稼働データファイル１２が形成される。
【００７５】
（判定処理／対策指示／対策施行／臨時点検による効果確認）
カソード防食管理装置１０に計測データファイル１１及び施設稼働データファイル１２が形成されると、これに基づいて前述した判定処理部２０，対策指示部２１，路線管理部２２の各機能に応じた処理がなされる。これらの処理による実際のパイプライン管理フローの一例を図１５〜図１８によって説明する。
【００７６】
図１５において、判定処理部２０による判定処理（Ｋ０１）の結果が全て合格（全ての（Ｉ_ＤＣ，Ｉ_ＡＣ）がカソード防食管理基準の領域Ｉ，ＩＩ内にある）の場合には、前述したように路線管理部２２に移行して、対象路線におけるプローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓの路線分布が作成され、この路線分布に基づく路線の健全性評価が行われる（Ｋ０２）。その結果、プローブオン電位Ｅ_ＯＮ又は管対地電位Ｅ_Ｐ／Ｓの路線分布にプラス側の特異点（両隣のいずれかの計測地点の計測値より５０ｍＶ以上プラス側にシフトした点）がない場合には、路線の健全性が確認されたとしてシステム登録がなされ（Ｋ０３）、この特異点がある場合には、メタルタッチの可能性があるので、更に過去のデータとの比較を行ってメタルタッチ箇所の抽出調査の必要性があるか否かを確認し（Ｋ０４）、ない場合はシステム登録する（Ｋ０５）。メタルタッチ箇所の抽出調査の必要性がある場合には、メタルタッチ箇所の特定を行い、メタルタッチ箇所に絶縁物を介在させる等の対策を施行し（Ｋ０６）、その後、臨時点検によって判定処理を行う（Ｋ０７）。臨時点検時の判定処理で合格すればシステム登録し（Ｋ０８）、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ０７）。
【００７７】
判定処理（Ｋ０１）の結果、不合格な計測データがある場合には、その不合格領域をカソード防食管理基準から確認（Ｋ０８）した後（領域ＩＩＩ：Ｉ_ＤＣ不足、領域ＩＶ：Ｉ_ＡＣ過大、領域Ｖ：Ｉ_ＤＣ過大）、前述した対策指示部２１の処理がなされる。
【００７８】
対策指示部２１の処理に基づく管理フローを図１６〜図１８に示す。判定処理の結果、プローブ交流電流密度Ｉ_ＡＣが過大であると判定された場合（▲１▼）には、路線情報データベース１３及び施設情報データベース１４から検索条件を抽出する。すなわち、不合格と判定された計測地点ないしはその近傍で交流誘導低減措置がとられていたかどうか（Ｋ１０）、とられていた場合にはどのような措置がとられていたか（Ｋ１１：交流誘導低減器によるものか、アース電極によるものか）について、或いは不合格と判定された計測地点周辺に鋼製ケーシング又は鋼製矢板等の低接地物があるか否か（Ｋ１２）、といった情報を検索条件として抽出する。
【００７９】
そして、この抽出された検索条件によって対策指示テーブルを検索して必要な対策指示を出力する。すなわち、検索条件から、不合格と判定された計測地点ないしはその近傍には交流誘導低減措置がとられておらず、その周辺に鋼製ケーシング等の低接地物が存在するという条件が得られる場合には、対策指示テーブルから「交流誘導低減器の設置可」（Ｋ１３）という指示が出力され、その対策が施行されることになり、また、交流誘導低減措置がとられておらず、その周辺に低接地物がないという条件が得られる場合には、対策指示テーブルから「アース電極の設置要」（Ｋ１４）という対策指示が出力されて、その対策が施行されることになる。これらの対策が施行された後には、前述したような臨時点検による判定処理（Ｋ１５，Ｋ１７）がなされ、臨時点検時の判定処理で合格すればシステム登録し（Ｋ１６，Ｋ１８）、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ１５，１７）。
【００８０】
また、不合格と判定された計測地点周辺に交流誘導低減措置がとられていたという条件が得られる場合には、それが如何なる措置であるかという検索条件を得ることで、その措置に対する「作動確認」（Ｋ１９）という対策指示が出力されることになる。
【００８１】
判定処理の結果、プローブ流入直流電流密度Ｉ_ＤＣが不足であると判定された場合（▲２▼）には、図１７に示すように、逆の不合格領域である領域Ｖの計測データがない（Ｋ２０）か、周辺の干渉対象施設の選定（Ｋ２１）、周辺の外部電源の稼働状況は適切か（Ｋ２２）等といった情報を検索条件として抽出し、抽出された検索条件によって対策指示テーブルを検索して必要な対策指示を出力する。すなわち、対象路線内の他の計測データに領域Ｖのデータがある（同一路線にカソード防食管理基準を満たさない大きいＩ_ＤＣが存在する）という条件が得られた場合には、当該パイプラインに対する干渉対象の施設を選んで（Ｋ２１）、対策指示テーブルからその施設の「干渉調査」（Ｋ２３）という対策指示が出力されることになる。また、対象路線内の他の計測データに領域Ｖの計測データがなく、周辺にある外部電源の稼働状況が低レベル（Ｋ２２）であるという条件が得られる場合には、対策指示テーブルから「外部電源の出力電流増大」（Ｋ２４）という対策指示が出力されることになる。
【００８２】
干渉調査の結果、干渉ありの場合には、それに応じて排流器又は外部電源の容量を決定し、それを設置する（Ｋ２５）。その後、臨時点検によって判定処理（Ｋ２６）を行う。臨時点検時の判定処理で合格すればシステム登録（Ｋ２７）し、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ２６）。
【００８３】
また、外部電源の出力電流増大の対策指示が出力された場合には、この指示に応じて施設制御部２３が駆動され、制御信号に基づいて外部電源の出力制御が行われる。その後、臨時点検によって判定処理を行う（Ｋ２８）。臨時点検時の判定処理で合格すればシステム登録し（Ｋ２９）、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ２８）。
【００８４】
また、判定処理の結果、プローブ流入直流電流密度Ｉ_ＤＣが過大であると判定された場合（▲３▼）には、図１８に示すように、逆の不合格領域である領域ＩＩＩの計測データがない（Ｋ３０）か、周辺の干渉対象施設の選定（Ｋ３１）、周辺の外部電源の稼働状況は適切か（Ｋ３２）等といった情報を検索条件として抽出し、抽出された検索条件によって対策指示テーブルを検索して必要な対策指示を出力する。すなわち、対象路線内の他の計測データに領域ＩＩＩのデータがある（同一路線にカソード防食管理基準を満たさない小さいＩ_ＤＣが存在する）という条件が得られる場合には、当該パイプラインに対する干渉対象の施設を選んで（Ｋ３１）、対策指示テーブルからその施設の「干渉調査」（Ｋ３３）という対策指示が出力されることになる。また、対象路線内の他の計測データに領域ＩＩＩの計測データがなく、周辺にある外部電源の稼働状況が高レベル（Ｋ３２）であるという条件が得られる場合には、対策指示テーブルから「外部電源の出力電流低減」（Ｋ３４）という対策指示が出力されることになる。
【００８５】
干渉調査の結果、干渉ありの場合には、それに応じて排流器又は外部電源の容量を決定し、これを設置する（Ｋ３５）。その後、臨時点検によって判定処理（Ｋ３６）を行う。臨時点検時の判定処理で合格すればシステム登録（Ｋ３７）し、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ３６）。
【００８６】
また、外部電源の出力電流低減の対策指示が出力された場合には、この指示に応じて施設制御部２３が駆動され、制御信号に基づいて外部電源の出力制御が行われる。その後、臨時点検によって判定処理を行う（Ｋ３８）。臨時点検時の判定処理で合格すればシステム登録し（Ｋ３９）、不合格であれば再度必要な対策を講じた後、臨時点検を行う（Ｋ３８）。
【００８７】
（カソード防食施設の遠隔監視）
カソード防食管理装置１０の施設監視部２４によって、管理地域内にある各カソード防食施設を遠隔監視することができる。これは、腐食リスク回避のためにカソード防食施設の稼働状態をモニタし、不具合が生じた場合に警告を発するというだけでなく、常時監視を行うことで更に有効な施設の管理を可能にしている。例えば、外部電源５０に対しては、使用年数、回路抵抗状態、定格電気容量に対する稼働容量等を総合的に考慮して、機器の入れ換え時期、部品（整流器等）の交換時期等の管理を行うことができる。また、外部電源或いは選択排流器の稼働率を管理することで、過大な負荷がかかっている外部電源や選択排流器があれば、外部電源の分散配置や選択抵抗器の抵抗を高くする等の措置を講じることができる。更には、殆ど稼働していない外部電源及び選択排流器があるにも拘わらず、カソード防食状況に問題なければ、それらの施設は不要施設として撤去を検討する。
【００８８】
また、一般に強制排流器や選択排流器は電鉄敷地内に設置されている場合が多く、これらの施設を点検する際には、電鉄会社への事前申請や点検時の列車見張り員の配備等、手続やコストを多大に要したが、カソード防食施設の遠隔監視によってこれらの問題を解決することができ、作業効率の向上及びコスト削減を図ることができる。
【００８９】
【発明の効果】
本発明はこのように構成されるので、少なくとも隣接する計測点間の関係を迅速に把握することができ、路線単位でのカソード防食管理を可能にして、特にメタルタッチの可能性を把握することができる。また、カソード防食状況を路線の敷設状況又はカソード防食施設の設置状況との関係で把握することで、カソード防食状況が悪化した原因を特定して、迅速且つ有効な対策を講じることができる。更には、カソード防食施設の稼働状況を常時監視することで施設不具合による腐食リスクの発生を回避すると共に、計測結果に基づいてカソード防食施設の稼働状況を有効に変更することができる、また、人手を介さないカソード防食管理によってヒューマンエラーを無くし、また人件費を削減するとこができる。
【図面の簡単な説明】
【図１】従来技術の説明図。
【図２】本発明の実施形態に係るカソード防食管理装置のシステム構成を示す説明図。
【図３】本発明の実施形態における計測データファイルのデータ構造を示す説明図。
【図４】本発明の実施形態における施設稼働データファイルのデータ構造を示す説明図。
【図５】本発明の実施形態における判定処理部の機能を示す処理フロー。
【図６】カソード防食管理基準を示す説明図。
【図７】本発明の実施形態における対策指示部の機能を示す処理フロー。
【図８】本発明の実施形態における対策指示テーブルの一例を示す説明図。
【図９】本発明の実施形態における路線管理部の機能を示す処理フロー。
【図１０】本発明の実施形態における路線分布によるパイプラインの健全性評価の一例を示す説明図。
【図１１】本発明の実施形態における施設制御部の機能を示す処理フロー。
【図１２】本発明の実施形態における施設監視部の機能を示すフロー。
【図１３】本発明のカソード防食管理装置によるカソード防食管理システムを説明する説明図。
【図１４】保安回路の回路構成を示す説明図。
【図１５】パイプラインの管理フローを示す説明図。
【図１６】パイプラインの管理フローを示す説明図。
【図１７】パイプラインの管理フローを示す説明図。
【図１８】パイプラインの管理フローを示す説明図。
【符号の説明】
１ パイプライン １Ａ 塗覆装
２ プローブ
３ 照合電極
４Ａ〜４Ｃ 導線
５ モニタ装置
６ コンピュータ
７ 高感度電圧計
１０ カソード防食管理装置
１１ 計測データファイル
１２ 施設稼働データファイル
１３ 路線情報データベース
１４ 施設情報データベース
１５ 路線管理データベース
２０ 判定処理部
２１ 対策指示部
２２ 路線管理部
２３ 施設制御部
２４ 施設管理部
２５ 出力表示装置
３０ 電力の高圧交流架空送電線
４０ 直流電気鉄道
４１ レール ４２ 電車線 ４３ 変電所
５０ 外部電源
５１ 強制排流器
５２ 選択排流器
５３ 低接地物
５４ 犠牲陽極
５５ 保安回路
５６ アース電極
５７ モニタ制御装置
６１Ａ，６１Ｂ 導線
６２ ヒューズ
６３ サージ吸収素子
６４，６６ 逆流防止用ダイオード
６５ コイル
７０ 非極性容量回路
８０ 電流モニタリング回路
ＴＢ１〜ＴＢ４ ターミナルボックス[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cathodic protection management apparatus for a pipeline, a cathodic protection management program, and a cathodic protection management system.
[0002]
[Prior art]
As a method and apparatus for determining the cathodic protection status of a pipeline buried underground, the method described in Patent Document 1 below has been proposed by the present applicant. As shown in FIG. 1, this prior art brings a probe 2 simulating a coating defect close to a pipeline 1 coated with a coating 1A and a reference electrode (saturated copper sulfate electrode) on the ground surface. ) 3, an ammeter 5 a and a switch 5 b provided between the conductive wires 4 A and 4 B electrically connecting the pipeline 1 and the probe 2, and a conductive wire 4 A and 4 C electrically connecting the probe 2 and the verification electrode 3. A monitoring device 5 having a voltmeter 5c provided therebetween, an ammeter 5a measured while turning on and off the switch 5b, and a data processing device 5d to which a measured value of the voltmeter 5c is input is provided. 5 is connected to the computer 6 to determine the cathodic protection status based on the above-mentioned measured values.
[0003]
This prior art is based on the probe polarization potential (probe off potential E obtained when the switch 5b is opened). _OFF ) And a DC component of the current density (probe current density) acquired by the ammeter 5a (probe inflow DC current density I) _DC ) And AC component (probe AC current density I _AC ) Is used as an index to check the anticorrosion status by checking these against the cathodic protection standards. According to this, DC corrosion due to DC leakage caused by rail leakage current of DC electric railways and cathodic protection related electrical equipment, etc., and AC corrosion caused by AC induction from high-voltage AC overhead power transmission lines, AC electric railways, etc. Can be simultaneously evaluated.
[0004]
Further, in contrast to the measuring method in which such a probe 2 is installed, only the above-described verification electrode 3 is connected to the pipeline 1, and the potential between them is measured with a voltmeter, so that the pipe-to-ground potential E _{P / S} It has been conventionally performed as a simple method to determine the electric corrosion state by obtaining the value and comparing it with a reference value. Also in the prior art described above, the measured value (probe-on potential E) of the voltmeter 5c with the switch 5b closed. _ON ) Tube ground potential E _{P / S} A value corresponding to can be measured.
[0005]
[Patent Document 1]
JP-A-10-332622
[0006]
[Problems to be solved by the invention]
In the measurement of the cathodic protection situation using such a conventional technique, the probe 2, the verification electrode 3, and the conductors 4A to 4C shown in FIG. 1 are arranged in a terminal box provided at predetermined intervals for each pipeline route. Then, the monitor device 5 was connected to each terminal box to obtain measurement data. That is, the cathodic protection status for the pipeline is managed based on whether or not the measurement data measured at the measurement point corresponding to each terminal box satisfies the cathodic protection control standard.
[0007]
However, when the entire pipeline route is targeted, even if the measurement data in each terminal box satisfies the cathodic protection control standard, the route between the terminal boxes is not preferable for cathodic protection management. There was a possibility that this situation could be overlooked in the measurement for each terminal box. For example, when the pipeline to be measured is in contact with a low grounded object (such as a bare other pipeline without coating) (hereinafter referred to as metal touch), crevice corrosion at the contact point However, the corrosion state in such a situation may not be accurately reflected in the measurement data described above, and in cathodic protection management in individual terminal boxes, There was a possibility of overlooking a serious metal touch.
[0008]
In addition, in the conventional technology, when the cathodic protection status in each terminal box does not satisfy the cathodic protection control standard, it is not possible to easily compare measurement data at different measurement points on the same route, and Identify the cause of the deterioration of the cathodic protection situation because it is not possible to quickly grasp the relationship with the installation status of the laying situation and cathodic protection facilities (external power supply, forced exhaust, selective exhaust, etc.) In addition to being unable to do so, there was a problem that it was impossible to take quick and effective measures.
[0009]
In addition, in order to prevent corrosion of the pipeline, it is essential to supply the cathode current to the pipeline at all times in order to satisfy the cathodic protection control standards, and the external power supply and forced drainer are always operating normally. It is necessary to confirm that. In addition, in the worst case, the selective drainer is short-circuited between the pipeline and the drainage rail at the contact point, diode failure, fuse blown, etc. Since current flows and a risk of corrosion occurs in the pipeline, it is necessary to constantly monitor the exhaust current even for this selective drain. However, if it is intended to constantly monitor the operating status of such a cathodic protection facility, there is a problem that a large labor cost is required when a large number of pipelines are targeted in a wide area.
[0010]
In addition, since the operation status of the cathodic protection facility was not included in the determination of the measurement result, the relationship between the measurement result and the operation status of the cathodic protection facility is unknown, and the operation status of the cathodic protection facility is a countermeasure against the measurement result. There was a problem that could not be changed effectively. Furthermore, since the operation of the cathodic protection facility has not been adequately monitored, it is impossible to know when to replace the cathodic protection facility, and there is a temporary risk of corrosion due to damage or shutdown due to the life of the cathodic protection facility. There was also a problem.
[0011]
And the management of the cathodic protection situation according to the prior art is, for example, manually handling the measurement results at the periodic inspection every six months or every year for each terminal box, analyzing the measurement results, and taking measures based on the analysis Were considered individually. According to this, countermeasures and effects after countermeasures are not systematically performed for each route, and there is a possibility of human error due to data management and analysis through human resources. There was a problem that effective route management was not always perfect.
[0012]
The present invention has been proposed to cope with such a situation, and can quickly grasp at least the relationship between adjacent measurement points, enabling cathodic protection management in units of routes, In particular, the possibility of metal touch can be grasped, and the cathodic protection status is grasped in relation to the laying status of the route or the installation status of the cathodic protection facility, so that the cause of the deterioration of the cathodic protection status can be identified and quickly In addition, it is possible to take effective measures, avoid the occurrence of corrosion risk due to facility malfunctions by constantly monitoring the operating status of the cathodic protection facility, and effectively change the operating status of the cathodic protection facility based on the measurement results In addition, the object is to eliminate human error by cathodic protection without human intervention.
[0013]
[Means for Solving the Problems]
In order to achieve such an object, the present invention has the following features.
[0014]
The first is a cathodic protection management device for pipelines, which includes measurement data on the cathodic protection status measured at multiple measurement points on each pipeline route and facility operation data sent from the cathodic protection facility installed on each route. In the pipeline cathodic protection management apparatus for managing the cathodic protection status of the pipeline for each route based on the measurement data storage means for storing the measurement data as data at each measurement point and measurement point, and the facility operation Facility operation data storage means for storing data in time series as data for each facility, route information storage means for storing the route information of the pipeline updated and stored as needed, and provided for each route of the pipeline Facility information storage means in which facility information of the cathodic protection facility is updated and stored at any time, and the selected route When the measurement data is checked against the cathodic protection management standard to determine the cathodic protection status, and when the determination result of the determination processing means is defective, necessary measures are taken based on the measurement data determined to be defective. Countermeasure instruction means for outputting instructions, and route management means for evaluating the soundness of each pipeline route when the determination result of the determination processing means is good, the countermeasure instruction means includes a search condition, A countermeasure instruction table corresponding to each countermeasure instruction item is provided, and at least one of the facility operation data storage means, the route information storage means, and the facility information storage means based on the measurement data determined to be defective or The search conditions are extracted from a plurality of items, the countermeasure instruction table is searched according to the search conditions, and necessary countermeasure instruction items are output.
[0015]
Assuming the above-described pipeline cathodic protection system, the measurement data is one or more of probe inflow DC current density, probe AC current density, probe off potential, probe on potential, and tube-to-ground potential. And
[0016]
On the premise of the above-described pipeline cathodic protection management apparatus, the countermeasure instructing means extracts the surrounding information as the search condition from the route information storage means according to the measurement point of the measurement data determined to be defective. The information including whether or not a cathodic protection facility exists in the vicinity thereof is extracted as the search condition from the facility information storage means, and when there is a cathodic protection facility in the search condition, it is determined as the defect. The search condition including the facility operation data at the time is extracted from the facility operation data storage unit according to the measurement time of the measurement data.
[0017]
On the premise of the above-described pipeline cathodic protection management device, the countermeasure instruction means determines that the determination result of the determination process is defective due to a lack of probe inflow DC current density, and the measurement data determined to be defective. Using the search condition that there is a large probe inflow DC current density that does not satisfy the cathodic protection control standard in the measurement data at other measurement points on the same route to the measurement point, an interference investigation instruction is issued from the countermeasure instruction table. It is characterized by outputting.
[0018]
On the premise of the above-described pipeline cathodic protection management apparatus, the countermeasure instructing means determines that the determination result of the determination processing is determined to be defective due to an excessive probe inflow DC current density, and the measurement data determined to be defective. Using the search condition that there is a small probe inflow DC current density that does not satisfy the cathodic protection standard in the measurement data at other measurement points on the same route with respect to the measurement point, an interference investigation instruction is issued from the countermeasure instruction table. It is characterized by outputting.
[0019]
On the premise of the above-described pipeline cathodic protection system, the countermeasure instructing means determines that the determination result of the determination process is determined to be defective due to insufficient or excessive probe inflow DC current density, and measurement determined to be defective. Based on the search condition that there is no probe inflow DC current density that does not satisfy the cathodic protection control standard in the measurement data at other measurement points on the same route with respect to the data measurement point, the search instruction table indicates the external power supply An output control instruction is output.
[0020]
On the premise of the above-described pipeline cathodic protection management device, the countermeasure instruction means determines that the determination result of the determination process is determined to be defective due to an excessive probe AC current density, and the measurement point of measurement data determined to be defective. Whether or not AC induction reduction measures are taken in the vicinity thereof is used as the search condition, and if it is taken, an operation confirmation instruction is output, and if not taken, low grounding around the route is taken. The presence of an object is checked, and if there is a low-grounding object, an instruction to install an AC induction reducer is output. If there is no low-grounding object, an instruction to install an earth electrode is output. And
[0021]
On the premise of the above-described pipeline cathodic protection management apparatus, the route management unit is configured to obtain measurement data from the measurement data stored in the measurement data storage unit and the route information stored in the route information storage unit. A route distribution is created, and the soundness of the pipeline in the route is evaluated based on the route distribution.
[0022]
Assuming the above-described pipeline cathodic protection system, the pipe-to-ground potential or the probe-on potential is used as the measurement data, and the measurement data at a specific measurement point is more positive than the reference value than either of the measurement data on both sides. It is characterized by evaluating the soundness of the pipeline based on the fact that it has not shifted to the standard.
[0023]
On the premise of the above-described pipeline cathodic protection management apparatus, the cathodic protection facility includes a facility that needs to be constantly monitored, and facility operation data sent from the facility is always stored in the facility operation data storage means, and the facility operation data is stored. It is characterized by comprising facility monitoring means for displaying a warning when the data exceeds a set threshold value.
[0024]
In addition, a general-purpose computer including a data storage unit, a data processing unit, and an output unit that outputs a processing result of the data processing unit is used as a cathodic protection management device having any of the above-described features. Cathodic protection management program for pipelines to function.
[0025]
One is a measuring means provided at a plurality of measurement points on each pipeline line to measure the cathodic protection status of the pipeline, a cathodic protection facility provided on each pipeline line, and a cathode of the pipeline. In the cathodic anticorrosion management system comprising a cathodic anticorrosion management device for remotely managing the anticorrosion status, the measuring means includes transmission means for transmitting measurement data to the cathodic anticorrosion management device, and the cathodic anticorrosion facility transmits the facility operation data to the cathode Transmitting means for transmitting to the anticorrosion management apparatus, wherein the cathodic protection management apparatus includes receiving means for receiving measurement data or facility operation data from each transmitting means, and the cathodic protection management apparatus is received by the receiving means. Measurement data for storing the measurement data as data for each measurement point and measurement point Data storage means, facility operation data storage means for storing the facility operation data received by the receiving means as data for each facility in time series, and routes in which the pipeline route information and the like are updated and stored as needed Information storage means, facility information storage means in which the facility information of the cathodic protection facility provided for each line of the pipeline is updated and stored as needed, and the measurement data is checked against the cathodic protection management standard and cathodic protection A determination processing means for determining a situation, a countermeasure instruction means for outputting a necessary countermeasure instruction based on measurement data determined to be defective when the determination result of the determination processing means is defective, and A route management means for evaluating the soundness of each pipeline route when the determination result is good, the countermeasure instruction means includes a search condition and each countermeasure instruction item; The search condition table includes at least one of the facility operation data storage means, the route information storage means, and the facility information storage means based on the measurement data determined to be defective. Is extracted, and the countermeasure instruction table is retrieved according to the retrieval condition and necessary countermeasure instruction items are output.
[0026]
On the premise of the above-described pipeline cathodic protection system, the cathodic protection facility includes a facility that requires constant monitoring, and facility operation data transmitted from the facility is always stored in the facility operation data storage means, The cathode anticorrosion management device is provided with facility monitoring means for displaying a warning when the facility operation data exceeds a set threshold value.
[0027]
On the premise of the above-described pipeline cathodic protection system, the cathodic protection facility includes an external power source, a forced drain or a selective drain, and the external power source, the forced drain or the selective drain Adjusting means for adjusting the output current or the exhaust current according to a control signal transmitted from the cathode anticorrosion management device is provided, and the cathodic anticorrosion management device is configured to control the external power source, the forced power supply based on the countermeasure instruction from the countermeasure instruction means. A control signal is output to the drainer or the selective drainer.
[0028]
Based on the above-described pipeline cathodic protection system, the cathodic protection facility includes a safety circuit connected between the pipeline and a sacrificial anode or a low-grounded object, and the safety circuit is at least from the pipeline. A backflow prevention element that allows only a direct current flowing through the lead wire to the sacrificial anode or low grounded object is provided, and an output from the current monitoring means inserted in series with the backflow prevention element is transmitted to the cathode anticorrosion management device. It is characterized by.
[0029]
According to the cathodic protection management apparatus, the cathodic protection management program, and the cathodic protection management system having such characteristics, one of them is the cathodic protection status measurement data measured at a plurality of measurement points in each pipeline and each route. The facility operation data sent from the cathodic protection facility deployed in the facility is input, and the measurement data is sequentially stored as data at each measurement point and measurement point, and the facility operation data is sequentially stored as data for each facility in time series Therefore, it becomes possible to easily handle measurement data measured at a number of measurement points in a specific area for each route and for each measurement point, and to easily compare this measurement data with facility operation data at the same time. It becomes possible. Furthermore, since these data are sequentially stored, it is possible to easily grasp time-series changes in the cathodic protection situation on a route basis by comparing past data.
[0030]
In addition, pipeline route information and map information around the pipeline are updated and stored as needed, and facility information on the cathodic protection facilities deployed for each pipeline route is updated and stored as needed. The stored measurement data and facility operation data can be handled in the light of route information, map information, facility information, and the like. That is, by displaying each measurement data along the route, it is possible to easily create a route distribution of the measurement data, and to easily compare the measurement data measured at the same time at different measurement points on the same route Can do. Furthermore, it is possible to easily compare the facility operation data taking into account the route distribution of the measurement data and the type and position of the cathodic protection facility. As a result, it is possible to easily determine the possibility of metal touch that is difficult to find by simply checking the measurement data with the cathodic protection management standard.
[0031]
In addition, since all measurement data is judged and compared with the cathodic protection management standard, the current cathodic protection status can be grasped by checking with the cathodic protection management standard, and the measurement data does not meet the cathodic protection management standard. Search the countermeasure instruction table by search conditions extracted from route information, facility information, current route unit measurement data and surrounding facility operation data, past route unit measurement data and surrounding facility operation data, It is possible to automatically select the most suitable measure for the current cathodic protection situation. Furthermore, the measurement data and facility operation data for the pipeline after the countermeasure are handled in the same manner, so that the effect of the implemented countermeasure can be easily confirmed by the determination process. When the measurement data satisfies the cathodic protection management standard, the soundness of the pipeline can be evaluated in units of routes, not just grasping the cathodic protection status at each measurement point.
[0032]
Moreover, by measuring probe inflow DC current density, probe AC current density, and probe off potential as measurement data, DC corrosion and AC corrosion can be evaluated simultaneously, and probe on potential and tube-to-ground potential are handled equally. Thus, even when a measurement point where the probe is installed and a measurement point where only the tube-to-ground potential is measured without the probe being installed are mixed, systematic management for each route can be performed.
[0033]
In addition, when instructing countermeasures, it is possible to check whether there are facilities that cause electrical corrosion in the vicinity of the measurement points of measurement data that did not meet the cathodic protection standards. From the facility information, it can be checked whether or not there is a cathodic protection facility in the vicinity. If there is a cathodic protection facility in the vicinity of the measurement point where the measurement data does not meet the cathodic protection control standard, the facility operation status at the time when the measurement data is measured can be checked from the facility operation data. it can. As a result, it is possible to obtain effective measures taking route information, facility information, and facility operation status into consideration.
[0034]
A specific example of the relationship between the search conditions in the countermeasure instruction table and countermeasure instructions is shown in the case where there is measurement data in which the probe inflow DC current density is insufficient with respect to the cathodic protection control standard. When there is a large probe inflow DC current density that does not satisfy the cathodic protection control standard in the probe inflow DC current density measured at other measurement points on the same route with respect to the data measurement point, or in the measurement data When there is measurement data in which the probe inflow DC current density is excessive with respect to the cathodic protection control standard, the probe inflow DC current density measured at other measurement points on the same route with respect to the measurement data measurement point If there is a small probe inflow DC current density that does not meet the cathodic protection standards, under these conditions, Since the interference of it is considered to correspond the instructions of "interference investigation" as a countermeasure instructions.
[0035]
In addition, if there is measurement data in the measurement data that the probe inflow DC current density is insufficient with respect to the cathodic protection control standard, measurement is performed at other measurement points on the same route with respect to the measurement data measurement point. If there is no large probe inflow DC current density that does not satisfy the cathodic protection control standard in the measured probe inflow DC current density, or if the probe inflow DC current density is too large for the cathodic protection management standard in the measurement data If there is no small probe inflow DC current density that does not meet the cathodic protection control standard in the probe inflow DC current density measured at other measurement points on the same route with respect to the measurement point of the measurement data, Under such conditions, the cathodic protection status is kept within the cathodic protection control standard by adjusting the output of a specific external power supply. It is considered that the bets can be made to correspond to "output control of the external power supply" as the countermeasure instruction.
[0036]
In addition, if the measurement data includes measurement data whose probe AC current density is excessive with respect to the cathodic protection standard, whether or not AC induction reduction measures are taken at or near the measurement point. If there is a low grounding object on the route, if it is not taken, the AC guidance reducer or other "operation check instruction" is handled. If there is, there is an instruction that it is possible to install an AC induction reducer, and if there is no low-grounded object, an instruction to reduce AC induction by installing an earth electrode is given.
[0037]
When all the measurement data satisfies the cathodic protection management standard, route management is performed to evaluate the soundness of the pipeline for each route from the route distribution of the measurement data. In this route management, a route distribution of measurement data is created from the measurement data for each measurement point stored in the measurement data storage unit and the route information stored in the route information storage unit, and the route distribution is stored for each measurement time point. In addition, the soundness of the pipeline on the route based on the information about the route extracted from one or more of the facility operation data storage unit, the route information storage unit, the facility information storage unit and the stored past route distribution To evaluate.
[0038]
When using pipe-to-ground potential or probe-on potential as measurement data in route management, it is determined that the measurement data at a specific measurement point is not shifted to the plus side of the predetermined reference value from the measurement data on both sides Assess the integrity of the pipeline as a standard. As a result, if the measurement data of a specific measurement point is shifted to the plus side of the predetermined reference value with respect to either of the measurement data on either side, it is necessary to investigate the possibility of metal touch in the pipeline. If there is no shift, it is determined that there is no possibility of metal touch, and the soundness of this pipeline is registered in the system.
[0039]
For cathodic protection facilities that require constant monitoring, the facility operation data sent from these facilities is always stored in the facility operation data storage means, and the facility operation data exceeds the set threshold. Display a warning. As a result, the cathodic protection facility can be constantly monitored, and the risk of corrosion of the pipeline due to the stoppage of the cathodic protection facility can be eliminated.
[0040]
In addition, the external power source, the forced drainer or the selective drainer is provided with an adjusting unit that adjusts the output current or the drain current according to the control signal transmitted from the cathode anticorrosion management device. By transmitting a control signal according to the output, it becomes possible to remotely control such a cathodic protection facility.
[0041]
Also, when a safety circuit is connected between the pipeline and a sacrificial anode or an AC induction reducing low-grounded object as a cathodic protection facility, current monitoring means is inserted in series with the backflow prevention element of the safety circuit, and this output Is transmitted to the cathode anticorrosion management device, facility operation data can be obtained, and the status of AC induction reduction measures can be grasped at a remote location.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings (the same parts as those in the prior art are denoted by the same reference numerals and duplicate descriptions are partially omitted). FIG. 2 is an explanatory diagram showing a system configuration of the cathodic protection management apparatus according to the embodiment of the present invention.
[0043]
The cathodic protection management apparatus 10 includes, as basic components, a measurement data file (measurement data storage unit) 11 that sequentially stores measurement data, a facility operation data file (measurement data storage unit) 12 that sequentially stores facility operation data, and a pipeline. The route information database (route information storage means) 13 in which the route information and the surrounding map information, etc. are updated and stored as needed, and the facility information of the cathodic protection facilities provided for each route in the pipeline are updated as needed. Stored facility information database (facility information storage means) 14, route management database 15 for registering route-managed information in the system, determination processing unit (determination processing means) 20 for determining the quality of the anticorrosion situation from the measurement data, measurement data Measures instruction section (measure instruction means) 21 for outputting necessary countermeasure instructions based on the measurement data, The route management unit (route management means) 22 for confirming the soundness of the pipeline for each route from the line distribution, the facility control unit 23 for controlling the cathodic protection facility based on the countermeasure instruction of the countermeasure instruction unit 21, and the operation of the cathodic protection facility A facility monitoring unit (facility monitoring unit means) 24 for monitoring the situation is provided, and information from the countermeasure instruction unit 21 and the route management unit 22 is displayed on the output display device 25.
[0044]
The measurement data is data measured by a measuring means installed in a terminal box arranged for every predetermined section along the pipeline to be managed. For example, a probe 2 as shown in FIG. 1 is provided. Probe inflow DC current density I measured by the monitor device 5 installed in the system _DC , Probe AC current density I _AC , Probe off potential E _OFF , Probe on potential E _ON Or tube potential E measured without the probe 2 _{P / S} Etc.
[0045]
Also, the facility operation data is the operation status data of the cathodic protection facility installed for the pipeline to be managed, such as the output current of the external power source, the exhaust current of the forced exhauster or the selective exhauster, etc. is there. Since the output current of the external power source and the exhaust current of the forced exhaust or selective exhaust need to be constantly monitored, the facility operation data is taken in at any time and stored in the facility operation data file 11.
[0046]
FIG. 3 is an explanatory diagram showing a data structure in the measurement data file 11, and the probe inflow DC current density I as measurement data. _DC Indicates a saved file. In the measurement data file 11, the input measurement data is stored in the measurement points (..., T _n-1 , T _n , T _{n + 1} , ...) and measurement time (..., D) _n-1 , D _n , D _{n + 1} ,...) Are sequentially stored as data for each measurement point T _n And measurement point D _n One measurement data I _DC (N, n) has a data structure that can be specified, and this forms a table (table1, table2, table3, ...) for each route. A file with such a data structure is the probe AC current density I _AC (N, n), probe off potential E _OFF (N, n), probe on potential E _ON (N, n), tube-to-ground potential E _{P / S} Each of (n, n) is formed as necessary.
[0047]
FIG. 4 is an explanatory diagram showing a data structure in the facility operation data file 12. Facility operation data includes various data (output current I of external power supply I _G , Forced exhaust current I _F , The drain current I of the selective drain _U Etc.) at each measurement point (..., D _n-1 , D _n , D _{n + 1} ,... Are sequentially stored in time series, and form a table (table1, table2, table3,...) For each route.
[0048]
In the route information database 13, management information for each route of the management target pipeline and surrounding map information are updated and recorded as needed, and each information can be extracted according to the position for each route. As an example of information, the map information includes the position of high-voltage AC overhead power transmission lines, DC / AC electric railways, etc. that cause electric corrosion, individual information on piping routes, routes (burial year, diameter, pipe grade , Type of coating, etc.), measurement point information (terminal box position, terminal box type, capacity and number of Mg electrodes, probe installation, set measurement time, etc.).
[0049]
In the facility information database 14, information on the cathodic protection facility for each route of the management target pipeline is updated and recorded as needed, and each information can be extracted according to the position for each route. Examples of information are the installation location, installation year, electrical capacity, control method, etc. of the external power supply, forced exhaust, and selective exhaust.
[0050]
Below, the function of each part in the cathodic protection management apparatus 10 is demonstrated.
[0051]
FIG. 5 is a processing flow showing the function of the determination processing unit 20. In the determination processing unit 20, first, the route of the management target pipeline is selected (S201), the data stored in the measurement data file 11 is sequentially read, and the measurement points (..., T _n-1 , T _n , T _{n + 1} , ...) and measurement time (..., D) _n-1 , D _n , D _{n + 1} , ...) every time the probe inflow DC current density I _DC And probe AC current density I _AC Are acquired as a set of data (S202). And each acquired (I _DC , I _AC ) Are compared with the cathodic protection management standard (S203), and it is determined whether each meets the cathodic protection management standard (S204).
[0052]
The cathodic protection control standard mentioned here is a management standard of the cathodic protection situation using the probe current density as an index, and the probe inflow DC current density I _DC And probe AC current density I _AC Is a reference region represented by two-dimensional coordinates with the coordinate axis (see Yuji Hosokawa, Fumio Hatakeyama, Yasuhiro Nakamura: Materials and Environment, Vol. 51, No. 5 (2002)). Specifically, the region I and region II shown in FIG. 6 showing the following Table 1 or the contents thereof are cathode corrosion protection achievement regions that satisfy the criteria. Incidentally, the region III shown is I _DC There is a concern about the risk of electrical corrosion due to the shortage, and region IV _AC Is excessive and there is a concern about the risk of AC corrosion. _DC This is an area of failure where there is concern about the risk of over-corrosion protection.
[0053]
[Table 1]

[0054]
And acquired (I _DC , I _AC ) All meet the cathodic protection standard (in the areas I and II), if this determination process is after the enforcement of the countermeasure (S205) The system is registered (S206), and if the countermeasure is not implemented, the process proceeds to the process of the route management unit 20. Also obtained (I _DC , I _AC ), Those that do not satisfy the cathodic protection management criteria are checked to determine which of the above-mentioned rejected regions (regions III to V) corresponds (S204D), and the process proceeds to the countermeasure instruction unit 21. (S204).
[0055]
FIG. 7 is a processing flow showing the function of the countermeasure instruction unit 21. In the countermeasure instruction unit 21, first, measurement data (I) determined by the determination processing unit 20 as not satisfying the cathodic protection management standard (defective). _DC , I _AC ), The measurement point and the measurement point are acquired as the countermeasure target measurement point Tnx and the countermeasure target measurement point Dnx (S211). Specifically, the terminal box number and the measurement time at which the measurement data that does not satisfy the cathodic protection management standard on the target route are obtained.
[0056]
Then, a search condition is extracted from at least one of the facility operation data file 12, the route information database 13, and the facility information database 14 based on the acquired measure target measurement point Tnx and measure target measurement time point Dnx (S212). That is, based on the acquired terminal box number and its measurement time, from the route information database 13, the terminal box and its surrounding route information (terminal box position, presence of electric railway lines around the terminal box, etc.), From the facility information database 14, the presence or absence of a cathodic protection facility around the terminal box (existence of external power supply, etc.), and from the facility operation data file 12, the size of the facility operation data at the above measurement time when there is a cathodic protection facility, etc. Is extracted as a search condition.
[0057]
By searching the countermeasure instruction table based on the extracted search conditions (S213), necessary countermeasure instruction items are output to the output display device 25 (S214). An example of the countermeasure instruction table is shown in FIG. This countermeasure instruction table includes a “failed area” (measurement data (I _DC , I _AC ) Corresponds to any of the cathodic protection management criteria failure areas III to V), “route information” (conditions extracted from the route information database 13), “facility information” (conditions extracted from the facility information database 14) Item), “facility operation status” (condition items extracted from the facility operation data file 12), which is a table in which countermeasure instruction items are associated with each other. 1 ”, if not applicable, a specific countermeasure instruction item corresponds to a search expression in which“ 0 ”is arranged. More specifically, the probe inflow DC current density I of one measurement data _DC Falls under the rejected area III and there is no data corresponding to the failed area in other measurement data, and the facility information corresponds to the presence of external power supply (b1), and the facility operating status When the operation level is low (c1), the countermeasure instruction item “increase in output current of external power supply” (A1) is searched.
[0058]
FIG. 9 is a processing flow showing functions of the route management unit 22. All the measurement data (I _DC , I _AC ) Shifts to the route management unit 22 when it is determined that the cathodic protection control standard is satisfied. In the route management unit 22, the probe-on potential E from the measurement data file 11 with respect to one route selected by the determination processing unit 20 described above. _ON Or tube-to-ground potential E _{P / S} Is acquired as data for each measurement point and measurement point (S221), and the probe-on potential E is obtained from the acquired measurement data and the route information stored in the route information database. _ON Or tube-to-ground potential E _{P / S} The route distribution is created, and this route distribution is stored in the route management database 15 for each measurement time (S222). Then, the soundness of the route selected based on the stored current or past route distribution is evaluated (S223). If the soundness is confirmed, the system is registered for each route (S224). The route distribution can be displayed on the output display device 25 as necessary.
[0059]
FIG. 10 shows an example of pipeline soundness evaluation based on route distribution. The route distribution shown here is the probe on potential E with respect to the route distance. _ON Or tube-to-ground potential E _{P / S} It is represented by the fluctuation distribution. Here, if there is a terminal box with probes installed over the entire area of a single route, the probe on potential E _ON The route distribution can be created only by the above, but if there is a measurement point where no probe is installed, the probe on potential E _ON And tube-to-ground potential E _{P / S} The route distribution may be mixed. An important management item evaluated by this route distribution is the presence or absence of metal touch. As shown in the figure, the probe-on potential E at the specific measurement point L1. _ON Or tube-to-ground potential E _{P / S} Is compared with the measurement data at the two adjacent measurement points to obtain the difference ΔE1 or ΔE2, which is greater than a reference value (for example, 50 mV), and the measurement data at the specific measurement point L1 shifts to the plus side. If there is such a singular point, it can be said that there is a high possibility that a metal touch exists near the specific measurement point. It is possible to evaluate the soundness of the pipeline by confirming that such a singular point does not exist.
[0060]
FIG. 11 is a process flow showing functions of the facility control unit 23. Cathodic protection facilities include facilities that require constant monitoring, such as external power supplies, forced exhausts or selective exhausts, and facility operation data sent from such facilities must be stored in facility operation data files at all times. become. The facility control unit 23 controls the operating state of each facility based on such facility operating data. According to this, first, the facility operation data of the constantly monitored facility is acquired from the facility operation data file 12 as needed (S231). Then, this is compared with a reference value as needed (S232), and a control signal is output so as to obtain an appropriate output with respect to the reference value (S233).
[0061]
FIG. 12 is a flowchart showing functions of the facility monitoring unit 24. For facilities that require constant monitoring, such as the external power supply, forced exhaustor or selective exhauster described above, the operating status of each facility is monitored based on the facility operating data, and a warning is issued if the operating status deteriorates It is something that emits. According to this, first, the facility operation data of the constantly monitored facility is acquired from the facility operation data file 12 as needed (S241). And this is compared with the threshold value set at any time (S242), and a warning is displayed when the facility operation data exceeds the set threshold value (S243). In addition, the facility monitoring unit 24 can constantly monitor the operating status of the cathodic protection facility at a remote location (S244).
[0062]
In the cathodic protection management apparatus 10 having such a system configuration, the measurement data file 11 and the facility operation data file 12 described above are formed in a memory or the like in the apparatus, and each data input from the input unit is sequentially stored. Alternatively, the measurement data file 11 and the facility operation data file 12 may be formed in an external storage device such as an HDD and connected to the apparatus main body. Moreover, you may make it supply the recording media, such as FD, MO, and DVD in which the measurement data file 11 and the facility operation | use data file 12 were formed, to the cathodic protection management apparatus 10 provided with the data reading apparatus. Further, the route information database 13 and the facility information database 14 may be formed in a storage device in the device, or may be formed in a storage device provided outside the device or in a remote place. Here, the route information database 13 and the facility information database 14 are different databases, but they may be managed as an integrated database.
[0063]
The cathode anticorrosion management device 10 may be a dedicated device formed by components having the functions described above, or may be added to a general-purpose computer having data storage means, data processing means, and processing result output means. It may be a program in which a program for providing the functions of the respective units is installed. In this case, the processing flow showing the function of each unit described above corresponds to the execution flow of the program, and the description of each unit described above corresponds to the function associated with the execution of the program.
[0064]
FIG. 13 is an explanatory view for explaining a cathodic protection management system by the cathodic protection management apparatus 10 described above. In the pipeline 1 to be managed, terminal boxes TB1, TB2, TB3, TB4 are arranged for each predetermined section. In each terminal box, measuring means for measuring the cathodic protection status for the pipeline 1 is installed. In the example shown in the figure, in the terminal boxes TB1 to TB3, measuring means in which a monitor device 5 is connected to the conducting wire between the pipeline 1, the probe 2 and the verification electrode 3 as shown in FIG. Current density I _DC , Probe AC current density I _AC , Probe off potential E _OFF , Probe on potential E _ON In the terminal box TB4, a measuring means in which a high-sensitivity voltmeter 7 is connected to the conducting wire between the pipeline 1 and the reference electrode 3 is installed, and the tube-to-ground potential E is measured. _{P / S} Is measured.
[0065]
Further, it is assumed that there are electrical corrosion-causing facilities such as the high-voltage AC overhead power transmission line 30 for electric power, the rail 41 of the DC electric railway 40, the train line 42, and the substation 43 around the pipeline 1. Various cathodic protection facilities have been deployed. As the cathodic protection facility, facilities such as an external power source 50, a forced exhaust device 51, and a selective exhaust device 52 that need to be constantly monitored are provided, and a low grounded object 53 such as a steel casing or a sacrificial anode 54 and a pipeline are provided. 1 is provided with a safety circuit 55 or a ground electrode 56 connected to the terminal 1.
[0066]
Here, the measurement means and the cathodic protection facility described above are connected to the cathodic protection management apparatus 10 online or offline, and are configured to be able to exchange measurement data, facility operation data, or control signals. In the following, an example in which the measurement means and the cathodic protection facility are connected to the cathodic protection management apparatus 10 by wire or wireless online will be described, but the embodiment of the present invention is not particularly limited thereto.
[0067]
The monitoring device 5 or the high-sensitivity voltmeter 7 that is a measuring means is provided with a transmitter that transmits measurement data at each specific measurement time point, and the cathode anticorrosion management device 10 side receives the transmitted measurement data. A machine is provided. As described above, the received measurement data is saved in the measurement data file 11 as needed.
[0068]
In addition, with respect to each of the above-described cathodic protection facilities, a facility that requires constant monitoring is provided with a transmitter / receiver, and a corresponding transmitter / receiver is also provided on the cathode anticorrosion management device 10 side. For example, the external power supply 50 transmits output current monitor data as facility operation data to the cathode anticorrosion management device 10 side by a transceiver and receives and outputs a control signal sent from the cathode anticorrosion management device 10 side. Adjustment means capable of adjusting the current is provided. The forced drainer 51 or the selective drainer 52 is provided with a monitor control device 57 having an ammeter and a variable resistor serving as a means for adjusting the drain current in the output-side conductor. Current measurement data is transmitted to the cathode anticorrosion management device 10 side, and the variable resistor is driven by a control signal from the cathode anticorrosion management device 10 side so that the exhaust current can be adjusted.
[0069]
The safety circuit 55 has a circuit configuration shown in FIG. 14 as an example. The safety circuit 55 is a circuit that does not require a power source connected between the conducting wire 61A connected to the pipeline 1 side and the conducting wire 61B connected to the low grounded object 53 such as a steel casing or the sacrificial anode 54 side. A fuse 62, a surge absorbing element (surge absorber) 63, and a first backflow prevention diode 64 that cut off the circuit when an excessive current flows are connected in series between the conductors 61A and 61B. In parallel with one backflow prevention diode 64, a coil 65, which is a high resistance element for a high frequency current, and a second backflow prevention diode 66 are connected in series. A nonpolar capacitance circuit 70 is connected in parallel with the second backflow prevention diode 66.
[0070]
The first backflow prevention diode 64 and the second backflow prevention diode 66 are installed in the forward direction with respect to a direct current from the pipeline 1 toward the low grounded object 53 or the sacrificial anode 54. The direct current from the line 1 to the low grounded object 53 or the sacrificial anode 54 is made conductive according to the potential difference between the two, and the reverse direct current is interrupted to maintain the insulation state. Is.
[0071]
The nonpolar capacitance circuit 70 is a circuit having an electric capacity for reducing an AC induction voltage at a low frequency, and the probe AC current density of the pipeline 1 is controlled by cathodic protection by the individual electric capacity of the plurality of capacitors 71 to 74. The electric capacity is set to be within the standard. Further, the plurality of capacitors 71 to 74 are composed of capacitors 71 and 73 having the same polarity direction and capacitors 72 and 74 having the opposite polarity direction, and a capacitor row including a set of the capacitor 71 and the capacitor 72, and a capacitor Capacitor arrays comprising a set of 73 and capacitor 74 are connected so that the same polarities of the polar plates are opposed to each other. Further, capacitors having the same polarity direction (capacitor 71 and capacitor 73, capacitor 72 and capacitor 74) are connected in parallel. In order to supply current to the capacitors 71 and 73, a diode 75 is provided in parallel with the capacitors 72 and 74, and the direction of the diode 75 is such that current is supplied to the capacitors 72 and 74. A diode 76 having different characteristics is provided in parallel with the capacitors 71 and 73. Further, a surge absorbing element 77 is connected in parallel with the capacitors 71 and 73, and a surge absorbing element 78 is connected in parallel with the capacitors 72 and 73, respectively.
[0072]
According to such a safety circuit 55, the AC induced voltage received by the pipeline 1 can be effectively reduced, and it is possible to cope with impact protection against lightning currents in a wide frequency band including high-frequency components, and cathodic protection. It is possible to realize a circuit that does not induce corrosion in the pipeline 1 even in a natural corrosion situation where the corrosion does not work. In such a safety circuit 55, a current monitoring circuit 80 is provided in series with the second backflow prevention diode 66, and this monitoring data is transmitted to the cathode anticorrosion management device 10 side as facility operation data by a transmitter to operate the facility. The data is stored in the facility operation data file 12 as data.
[0073]
Hereinafter, management of a pipeline using such a cathodic protection management apparatus 10 or a cathodic protection management system using the same will be exemplified.
[0074]
(Data acquisition by periodic inspection)
Pipeline management is usually carried out by periodic inspections performed at regular intervals. The above-described cathode anticorrosion management apparatus 10 may additionally include an execution management unit for periodic inspections. According to this, an instruction is issued according to the date of periodic inspections, and measurement data and facility operation data are accordingly transmitted. Is acquired. In one periodic inspection, the measurement data is acquired from all measurement points (terminal boxes) on a plurality of routes in the management area with this as one measurement time point. As described above, the measurement data and the facility operation data are input to the cathodic protection management apparatus 10 online or offline via a recording medium, and the measurement data file 11 and the facility operation data file 12 are formed.
[0075]
(Judgment processing / measure instruction / measure enforcement / effect check by temporary inspection)
When the measurement data file 11 and the facility operation data file 12 are formed in the cathode anticorrosion management device 10, processing corresponding to each function of the determination processing unit 20, the countermeasure instruction unit 21, and the route management unit 22 described above is performed based on the measurement data file 11 and the facility operation data file 12. Made. An example of an actual pipeline management flow by these processes will be described with reference to FIGS.
[0076]
In FIG. 15, the results of the determination processing (K01) by the determination processing unit 20 are all passed (all (I _DC , I _AC ) Is in the cathodic protection management reference regions I and II), the process proceeds to the route management unit 22 as described above, and the probe-on potential E on the target route is determined. _ON Or tube-to-ground potential E _{P / S} The route distribution is created, and the soundness evaluation of the route based on this route distribution is performed (K02). As a result, the probe-on potential E _ON Or tube-to-ground potential E _{P / S} If there is no singular point on the plus side (a point shifted to the plus side by 50 mV or more from the measurement value of either of the adjacent measurement points) in the route distribution of, the system registration is made assuming that the soundness of the route has been confirmed ( K03) If there is such a singular point, there is a possibility of metal touch, and further comparison with past data is performed to confirm whether or not there is a need for a metal touch location extraction survey (K04). If not, the system is registered (K05). If there is a need to investigate the metal touch location, identify the metal touch location and take measures such as interposing an insulator in the metal touch location (K06). (K07). If it passes the judgment process during the temporary inspection, the system is registered (K08). If it fails, the necessary measures are taken again, and then the temporary inspection is performed (K07).
[0077]
As a result of the determination process (K01), when there is unacceptable measurement data, the rejected area is confirmed (K08) from the cathodic protection control standard (area III: I). _DC Insufficiency, Region IV: I _AC Excessive, area V: I _DC The process of the countermeasure instruction unit 21 described above is performed.
[0078]
A management flow based on the processing of the countermeasure instruction unit 21 is shown in FIGS. As a result of the determination process, the probe alternating current density I _AC Is determined to be excessive (1), search conditions are extracted from the route information database 13 and the facility information database 14. That is, whether or not an AC induction reduction measure was taken at or near the measurement point determined to be unacceptable (K10), and if so, what measures were taken (K11: AC induction reduction) Search condition such as whether it is due to a container or earth electrode) or whether there is a low grounding object such as a steel casing or a steel sheet pile around the measurement point determined to be unacceptable (K12) Extract as
[0079]
Then, the countermeasure instruction table is retrieved according to the extracted retrieval condition and a necessary countermeasure instruction is output. In other words, from the search conditions, there is no AC induction reduction measures at or near the measurement point that is determined to be rejected, and there is a condition that there is a low grounding object such as a steel casing around it. In the countermeasure instruction table, the instruction “Installation of AC induction reducer is possible” (K13) is output, and the countermeasure will be enforced. If the condition that there is no low grounded object is obtained, the countermeasure instruction “Earth electrode installation required” (K14) is output from the countermeasure instruction table, and the countermeasure is implemented. After these measures are implemented, the judgment process (K15, K17) by the extraordinary inspection as described above is performed. If the judgment process at the occasion of the extraordinary inspection passes, the system is registered (K16, K18). After taking necessary measures again, a temporary inspection is performed (K15, 17).
[0080]
In addition, when the condition that the AC induction reduction measure was taken around the measurement point judged to be unacceptable is obtained, the search condition for the measure is taken to obtain the search condition for that measure. The countermeasure instruction “confirmation” (K19) is output.
[0081]
As a result of the determination process, the probe inflow DC current density I _DC When it is determined that there is a shortage ((2)), as shown in FIG. 17, there is no measurement data of the area V that is the reverse reject area (K20), or selection of surrounding interference target facilities Information such as (K21), whether the operation status of the peripheral external power supply is appropriate (K22) or the like is extracted as a search condition, and a countermeasure instruction table is searched according to the extracted search condition and a necessary countermeasure instruction is output. That is, there is data of region V in other measurement data in the target route (a large I that does not satisfy the cathodic protection management standard on the same route) _DC Is obtained), a facility to be interfered with the pipeline is selected (K21), and a countermeasure instruction “interference investigation” (K23) for the facility is output from the countermeasure instruction table. It will be. In addition, when there is no measurement data of the region V in other measurement data in the target route and the condition that the operation status of the external power supply in the vicinity is low (K22) is obtained from the countermeasure instruction table, “external The countermeasure instruction “output current increase of power supply” (K24) is output.
[0082]
As a result of the interference investigation, if there is interference, the capacity of the drain or external power source is determined accordingly and installed (K25). Thereafter, a determination process (K26) is performed by a temporary inspection. If it passes in the judgment process at the time of the temporary inspection, the system is registered (K27). If it fails, the necessary measures are taken again, and then the temporary inspection is performed (K26).
[0083]
When a countermeasure instruction for increasing the output current of the external power supply is output, the facility control unit 23 is driven according to the instruction, and output control of the external power supply is performed based on the control signal. Thereafter, a determination process is performed by temporary inspection (K28). If it passes the judgment process during the temporary inspection, the system is registered (K29). If it fails, the necessary measures are taken again, and then the temporary inspection is performed (K28).
[0084]
Further, as a result of the determination process, the probe inflow DC current density I _DC Is determined to be excessive ((3)), as shown in FIG. 18, there is no measurement data for the region III that is the reverse failure region (K30), or selection of surrounding interference target facilities Information such as (K31), whether the operation status of the peripheral external power supply is appropriate (K32) or the like is extracted as a search condition, and a countermeasure instruction table is searched according to the extracted search condition and a necessary countermeasure instruction is output. That is, there is data of region III in other measurement data in the target route (a small I that does not satisfy the cathodic protection control standard on the same route) _DC If there is a condition that the interference target for the pipeline is selected (K31), the countermeasure instruction “interference investigation” (K33) for the facility is output from the countermeasure instruction table. become. In addition, when there is no measurement data of the area III in the other measurement data in the target route, and the condition that the operation status of the external power supply in the vicinity is high (K32) is obtained from the countermeasure instruction table, The countermeasure instruction “output current reduction of power supply” (K34) is output.
[0085]
As a result of the interference investigation, if there is interference, the capacity of the drain or external power source is determined accordingly and installed (K35). Thereafter, a determination process (K36) is performed by a temporary inspection. If it passes in the judgment process at the time of the temporary inspection, the system is registered (K37). If it fails, the necessary measures are taken again, and then the temporary inspection is performed (K36).
[0086]
When an instruction to reduce the output current of the external power supply is output, the facility control unit 23 is driven in accordance with this instruction, and output control of the external power supply is performed based on the control signal. Thereafter, a determination process is performed by temporary inspection (K38). If it passes the judgment process during the temporary inspection, the system is registered (K39). If it fails, the necessary measures are taken again, and then the temporary inspection is performed (K38).
[0087]
(Remote monitoring of cathodic protection facilities)
The facility monitoring unit 24 of the cathode anticorrosion management device 10 can remotely monitor each cathode anticorrosion facility in the management area. This not only monitors the operating status of the cathodic protection facility to avoid corrosion risk, but also issues a warning when a malfunction occurs, and enables more effective facility management by constantly monitoring it. . For example, the external power supply 50 is managed in terms of the replacement time of equipment, the replacement time of parts (rectifiers, etc.), etc., comprehensively considering the years of use, the circuit resistance state, the operating capacity with respect to the rated electrical capacity, etc. be able to. Also, by managing the operating rate of the external power source or selective drain, if there is an external power source or selective drain that is overloaded, the distributed arrangement of the external power source and the resistance of the selective resistor are increased. Measures such as can be taken. Furthermore, if there is no problem with the cathodic protection situation despite the fact that there are external power sources and selective drains that are hardly in operation, these facilities are considered to be removed as unnecessary facilities.
[0088]
In general, forced exhausters and selective exhausters are often installed on the electric railway site, and when inspecting these facilities, prior application to the electric railway company and deployment of train watchers at the time of inspection However, these problems can be solved by remote monitoring of the cathodic protection facility, and work efficiency can be improved and costs can be reduced.
[0089]
【The invention's effect】
Since the present invention is configured in this way, it is possible to quickly grasp at least the relationship between adjacent measurement points, enable cathodic protection management in units of routes, and particularly grasp the possibility of metal touch. Can do. In addition, by grasping the cathodic protection status in relation to the laying status of the route or the setting status of the cathodic protection facility, it is possible to identify the cause of the deterioration of the cathodic protection status and take quick and effective measures. Furthermore, by constantly monitoring the operating status of the cathodic protection facility, it is possible to avoid the risk of corrosion due to facility malfunctions, and to effectively change the operating status of the cathodic protection facility based on the measurement results. It is possible to eliminate human error and reduce labor costs by cathodic protection management without intervention.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG.
FIG. 2 is an explanatory diagram showing a system configuration of a cathodic protection management apparatus according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a data structure of a measurement data file according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a data structure of a facility operation data file according to the embodiment of the present invention.
FIG. 5 is a processing flow showing the function of a determination processing unit in the embodiment of the present invention.
FIG. 6 is an explanatory diagram showing cathode anticorrosion management standards.
FIG. 7 is a processing flow showing the function of the countermeasure instruction unit in the embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an example of a countermeasure instruction table according to the embodiment of the present invention.
FIG. 9 is a processing flow showing the function of the route management unit in the embodiment of the present invention.
FIG. 10 is an explanatory diagram showing an example of pipeline soundness evaluation based on a route distribution in the embodiment of the present invention.
FIG. 11 is a processing flow showing functions of the facility control unit in the embodiment of the present invention.
FIG. 12 is a flowchart showing functions of the facility monitoring unit according to the embodiment of the present invention.
FIG. 13 is an explanatory diagram for explaining a cathodic protection management system by the cathodic protection management apparatus of the present invention.
FIG. 14 is an explanatory diagram showing a circuit configuration of a safety circuit.
FIG. 15 is an explanatory diagram showing a pipeline management flow;
FIG. 16 is an explanatory diagram showing a pipeline management flow;
FIG. 17 is an explanatory diagram showing a pipeline management flow;
FIG. 18 is an explanatory diagram showing a pipeline management flow;
[Explanation of symbols]
1 Pipeline 1A Coating
2 Probe
3 reference electrode
4A-4C conductor
5 Monitor device
6 Computer
7 High sensitivity voltmeter
10 Cathodic protection system
11 Measurement data file
12 facility operation data file
13 Route information database
14 Facility information database
15 Route management database
20 Judgment processing part
21 Countermeasure instruction part
22 Route Management Department
23 Facility Control Department
24 Facility Management Department
25 Output display device
30 High-voltage AC overhead power transmission line
40 DC Electric Railway
41 rails 42 train lines 43 substations
50 External power supply
51 Forced drain
52 Selective drain
53 Low ground objects
54 Sacrificial anode
55 Security circuit
56 Earth electrode
57 Monitor control device
61A, 61B Conductor
62 fuse
63 Surge absorber
64,66 Backflow prevention diode
65 coils
70 Nonpolar capacitance circuit
80 Current monitoring circuit
TB1-TB4 terminal box

Claims (15)

Based on the measurement data of the cathodic protection status measured at multiple measurement points on each pipeline route and the facility operation data sent from the cathodic protection facility installed on each route, the cathodic protection status of the pipeline is In the cathodic protection management equipment of the pipeline to manage every
Measurement data storage means for storing the measurement data as data for each measurement point and measurement point; and
Facility operation data storage means for storing the facility operation data in time series as data for each facility;
Route information storage means for storing route information and the like of the pipeline updated and stored as needed,
Facility information storage means in which facility information of the cathodic protection facility deployed for each pipeline route is updated and stored as needed.
A determination processing means for checking the cathodic protection status by checking the measurement data of the selected route with the cathodic protection management standard;
Countermeasure instruction means for outputting a necessary countermeasure instruction based on measurement data determined to be defective when the determination result of the determination processing means is defective;
When the determination result of the determination processing means is good, it comprises a route management means for evaluating the soundness of each route of the pipeline,
The countermeasure instruction means includes a countermeasure instruction table in which search conditions are associated with each countermeasure instruction item, and based on the measurement data determined to be defective, at least the facility operation data storage means, the route information storage means, A pipeline cathodic protection management apparatus that extracts the search condition from one or more of the facility information storage means, searches the countermeasure instruction table according to the search condition, and outputs a necessary countermeasure instruction item . 2. The pipeline cathode according to claim 1, wherein the measurement data is one or more of a probe inflow DC current density, a probe AC current density, a probe off potential, a probe on potential, and a tube-to-ground potential. Anticorrosion management device. The countermeasure instruction means extracts the surrounding information from the route information storage means as the search condition according to the measurement point of the measurement data determined to be defective, and the cathodic protection facility around the facility information storage means. If the cathodic protection facility exists under the search condition, the facility operation data storage means is extracted depending on the measurement time of the measurement data determined to be defective. The pipeline cathodic protection management apparatus according to claim 1, wherein the search condition including facility operation data at that time is extracted from the data. The countermeasure instruction means determines that the determination result of the determination process is defective due to a lack of probe inflow DC current density, and other measurement points on the same route with respect to the measurement point of measurement data determined to be defective. The interference survey instruction is output from the countermeasure instruction table, using as a search condition that there is a large probe inflow DC current density that does not satisfy the cathodic protection control standard in the measurement data at A cathodic protection system for a pipeline described in any one of the above. The countermeasure instruction means determines that the determination result of the determination process is defective due to excessive probe inflow DC current density, and other measurement points on the same route with respect to the measurement point of measurement data determined to be defective. 5. The interference investigation instruction is output from the countermeasure instruction table as the search condition that there is a small probe inflow DC current density that does not satisfy the cathodic protection control standard in the measurement data at A cathodic protection system for a pipeline described in any one of the above. The countermeasure instruction means determines that the determination result of the determination process is defective due to insufficient or excessive probe inflow DC current density, and other measurement points in the same route with respect to the measurement point of the measurement data determined to be defective. The output control instruction of an external power supply is output from the search instruction table, based on the fact that there is no probe inflow DC current density that does not satisfy the cathodic protection management standard in the measurement data at the measurement point, as the search condition. The cathodic protection management apparatus for a pipeline according to any one of 1 to 5. Whether the countermeasure instruction means has determined that the determination result of the determination process is defective due to an excessive probe AC current density, and has an AC induction reduction measure taken at or near the measurement point of the measurement data determined to be defective? If it is taken as a search condition, the operation confirmation instruction is output, and if it is not taken, the presence or absence of a low grounding object around the route is confirmed. If there is, an instruction to install an AC induction reducer is output, and if there is no low grounded object, an instruction to install an earth electrode is output. Pipeline cathodic protection system. The route management means creates a route distribution of measurement data from the measurement data for each measurement point stored in the measurement data storage means and the route information stored in the route information storage means, and based on the route distribution, The pipeline cathodic protection management apparatus according to any one of claims 1 to 7, wherein the soundness of the pipeline on a route is evaluated. The pipe-to-ground potential or probe-on potential is used as the measurement data, and the pipeline health is based on the fact that the measurement data at a specific measurement point is not shifted to the plus side of the reference value more than either of the measurement data on both sides. 9. The pipeline cathodic protection management apparatus according to claim 8, wherein the property is evaluated. The cathodic protection facility includes a facility that needs to be constantly monitored, and the facility operation data sent from the facility is always stored in the facility operation data storage means, and a warning is given when the facility operation data exceeds a set threshold value. The facility for monitoring cathodic protection of a pipeline according to any one of claims 1 to 9, further comprising facility monitoring means for displaying. A pipe that causes a general-purpose computer including a data storage unit, a data processing unit, and an output unit that outputs a processing result of the data processing unit to function as a cathodic protection management device according to any one of claims 1 to 10. Line cathodic protection program. Remotely manage the cathodic protection status of the pipeline, which is installed at multiple measurement points on each pipeline route, measures the cathodic protection status of the pipeline, the cathodic protection facilities installed on each pipeline route, and In the cathodic protection system consisting of cathodic protection equipment,
The measurement means includes transmission means for transmitting measurement data to the cathode protection management apparatus, the cathode protection facility includes transmission means for transmitting facility operation data to the cathode protection management apparatus, and the cathode protection management apparatus includes the Receiving means for receiving measurement data or facility operation data from each transmitting means,
The cathode anticorrosion management device is:
Measurement data storage means for storing the measurement data received by the reception means as data for each measurement point and measurement time point;
Facility operation data storage means for storing the facility operation data received by the reception means in time series as data for each facility;
Route information storage means for storing route information and the like of the pipeline updated and stored as needed,
Facility information storage means for storing the facility information of the cathodic protection facility deployed for each line of the pipeline as updated at any time;
Judgment processing means for checking the cathodic protection status by checking the measurement data with the cathodic protection control standard,
Countermeasure instruction means for outputting a necessary countermeasure instruction based on measurement data determined to be defective when the determination result of the determination processing means is defective;
When the determination result of the determination processing means is good, it comprises a route management means for evaluating the soundness of each pipeline route,
The countermeasure instruction means includes a countermeasure instruction table in which search conditions are associated with each countermeasure instruction item, and based on the measurement data determined to be defective, at least the facility operation data storage means, the route information storage means, A cathode cathodic protection management system for a pipeline, wherein the search condition is extracted from one or more of the facility information storage means, the countermeasure instruction table is searched according to the search condition, and a necessary countermeasure instruction item is output. . The cathodic protection facility includes a facility that needs to be constantly monitored, and facility operation data transmitted from the facility is always stored in the facility operation data storage means, and the facility operation data exceeds a set threshold value. 13. The pipeline cathodic protection management system according to claim 12, further comprising facility monitoring means for displaying a warning in the cathodic protection management apparatus. The cathodic protection facility includes an external power source, a forced drainer or a selective drainer. The external power source, the forced drainer or the selective drainer has an output current according to a control signal transmitted from the cathode protection management device. Or an adjustment means for adjusting the exhaust current, and the cathode anticorrosion management device outputs a control signal to the external power source, the forced exhauster or the selective exhauster based on a countermeasure instruction from the countermeasure instruction means The pipeline cathodic protection system for pipelines according to claim 12 or 13, characterized in that: The cathodic protection facility includes a safety circuit connected between a pipeline and a sacrificial anode or a low grounding object, the safety circuit flowing at least from the pipeline through a conductor to the sacrificial anode or the low grounding current. 15. The output from the current monitoring means, which includes a backflow prevention element that allows only the backflow prevention element and is inserted in series with the backflow prevention element, is transmitted to the cathode anticorrosion management device. The cathodic protection system for the described pipeline.

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