JP6354042B1 - Transformer degradation status display device - Google Patents
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Abstract
【課題】変圧器の劣化状況を連続的に表示することが可能な変圧器劣化状況表示装置を提供する。【解決手段】変圧器絶縁紙の重合度経時低下グラフ群の低下勾配の一つを重合度低下基準勾配Ｋｃとし、変圧器の負荷率に対する絶縁油温度の近似式を利用して、被診断変圧器の絶縁油温度または設置場所温度と運転電流より基準使用条件と実使用状態における被診断変圧器の絶縁紙の温度を算出し、基準使用条件における絶縁紙温度と実使用状態における絶縁紙温度との絶縁紙温度差Ｔｚｓから重合度低下勾配補正係数Ｒを、Ｒ＝１／ｅｘｐ（−Ｈ×Ｔｚｓ）にて算出し、算出した重合度補正係数Ｒを基準勾配Ｋｃに乗じて重合度低下の実勾配Ｋを導き、実勾配Ｋにより低下する過去から現時点までの重合度推移と、将来の重合度推移をグラフ表示３０する。【選択図】図３Disclosed is a transformer degradation status display device capable of continuously displaying a degradation status of a transformer. One of the gradients of the graph of the degree of deterioration of the degree of polymerization of transformer insulating paper over time is defined as a degree of polymerization reduction reference gradient Kc, and an approximate expression of the insulating oil temperature with respect to the load factor of the transformer is used to diagnose Calculate the insulation paper temperature of the diagnostic transformer in the standard use condition and actual use condition from the insulation oil temperature or installation location temperature of the unit and the operating current, and the insulation paper temperature in the reference use condition and the insulation paper temperature in the actual use condition. The polymerization degree decrease gradient correction coefficient R is calculated from the insulating paper temperature difference Tzs of R = 1 / exp (−H × Tzs), and the calculated polymerization degree correction coefficient R is multiplied by the reference gradient Kc to reduce the polymerization degree. An actual gradient K is derived, and a graph 30 displays the transition of the degree of polymerization from the past to the present and the transition of the future degree of polymerization, which decreases due to the actual gradient K. [Selection] Figure 3
Description
本発明は、変圧器の劣化状況を変圧器巻線間等に装着される絶縁紙（以下絶縁紙と省略表記）の平均重合度（以下重合度と省略表記）の低下推移で表示する技術に関する。 The present invention relates to a technique for displaying a deterioration state of a transformer as a decrease in average polymerization degree (hereinafter abbreviated as polymerization paper) of insulating paper (hereinafter abbreviated as insulation paper) mounted between transformer windings and the like. .
絶縁紙の重合度低下状況によって余寿命を推定し、変圧器の寿命に至る前に変圧器を更新し劣化による事故を防止することが進められている。 The remaining life is estimated based on the degree of polymerization degree of the insulating paper, and the transformer is renewed before the life of the transformer is reached to prevent accidents due to deterioration.
絶縁紙劣化状況を調べる手段として、変圧器停電時に絶縁紙の一部を取り出して重合度を測定する公知の方法や、運転状態のままで重合度を推定する下記文献１及び文献２等の方法がとられている。
絶縁紙の一部を取り出して重合度を測定する公知の方法は定期点検時にしか実施できず、変圧器運転再開後に変圧器使用条件の急激な悪化があった場合でも次の定期点検までは確認できないため重合度の加速的な低下兆候を見逃すこととなり、変圧器使用条件改善等の事故防止対策が遅れてしまうという欠点が有った。 The known method of taking out a part of insulating paper and measuring the degree of polymerization can only be carried out at the time of periodic inspection, and even if there is a sudden deterioration in transformer usage conditions after restarting the transformer operation, it is confirmed until the next periodic inspection Since this is not possible, the sign of an accelerated decrease in the degree of polymerization was missed, and there was a drawback that accident prevention measures such as improvement of transformer usage conditions were delayed.
変圧器運転時でも重合度を把握することができる特許文献１の方法は、被診断変圧器の負荷履歴と気象情報と点検時に測定した絶縁油温度とによる絶縁紙温度の推定熱履歴を、撤去変圧器絶縁紙の重合度測定値等より作成した絶縁紙の熱履歴と重合度の関係を示すマスターカーブと突き合わせて余寿命を求める方法をとっている。 The method of
変圧器運転時でも重合度を把握することができる別の方法である特許文献２の方法は、被診断変圧器の定期点検時等に採取した絶縁油に含まれるＣＯ、ＣＯ２、フルフラール等の劣化指標成分量と被診断変圧器の稼働年数、負荷率等の運転環境データを基にして重合度を推定し余寿命を求める方法をとっている。 The method of
しかしながら、前記特許文献１や特許文献２の方法は、絶縁紙や絶縁油からの絶縁劣化指標データ取得がなされる特定の変圧器に対する評価法であり、絶縁劣化指標データを取得しない変圧器には適用できないことと、点検時毎の断続的な評価法であることから、点検後に変圧器使用条件の急激な悪化があった場合の重合度の加速的低下兆候を見逃すこととなり、事故防止対策を適時に実施できないという欠点が有った。 However, the methods of
本発明はこのような事情に鑑みてなされたもので、絶縁劣化指標の取得がなされないことが多い小容量の変圧器も含めた変圧器全般にわたり、変圧器の使用開始から現在までの重合度低下状況を連続的に示すことで、変圧器運転条件の急激な変化による重合度低下兆候も見逃さず監視することを可能にし、変圧器運転条件の改善を適時に行えるようにすることを目的とする。 The present invention has been made in view of such circumstances, and the degree of polymerization from the start of use of the transformer to the present over all transformers including small-capacity transformers in which acquisition of an insulation deterioration index is often not made. By continuously showing the state of decline, it is possible to monitor signs of decreased polymerization due to sudden changes in transformer operating conditions, and to improve transformer operating conditions in a timely manner. To do.
前記目的を達成するために、請求項１に記載の装置は、変圧器の劣化状況を重合度の低下推移によって示す変圧器の劣化状況表示装置であって、重合度低下基準勾配Ｋｃを変圧器の基準使用条件（設置場所基準温度Ｔａｃ（６〜１８℃のうちの一つ）、基準運転負荷率Ｕｃ（１０〜７０％のうちの一つ））における絶縁紙温度を絶縁紙基準温度Ｔｚｃ、基準使用条件で連続運転されるとした場合の重合度の勾配が、変圧器使用開始時の重合度（８００〜１０００のうちの一つ）から１０／年〜６０／年のうちのいずれか一つの勾配で低下するとした重合度低下直線の勾配を重合度低下基準勾配Ｋｃとし、運転状態が変化する被診断変圧器においては、運転条件に関連して算出される重合度低下勾配補正係数Ｒ（以下勾配補正係数Ｒ）に前記重合度低下基準勾配Ｋｃを乗じた重合度低下実勾配Ｋにて低下するとし、前記勾配補正係数Ｒを、運転時における絶縁紙温度Ｔｚと、基準条件における前記絶縁紙基準温度Ｔｚｃとの差である絶縁紙温度差Ｔｚｓに関する計算式
Ｒ＝１／ｅｘｐ（−Ｈ×Ｔｚｓ）・・・・・（式１）
（ここに、Ｈは０．０６〜０．１４（１／℃）のうちの一つ）
により算出する手段と、被診断変圧器の絶縁油温度Ｔｏを取得する第１のデータ取得手段と、被診断変圧器の設置場所温度Ｔａと運転電流Ｉを取得する第２のデータ手段のいずれか、または両方のデータ取得手段と、
前記第１のデータ取得手段を有するものにおいて、
絶縁油の温度Ｔｏを、負荷率Ｕに関する絶縁油温度Ｔｏの近似式
Ｔｏ≒Ｔａ＋Ｔｍ＋Ｕｘ×（Ａ―Ｔｍ）・・・・・（式２）
（ここに、Ｔａは変圧器設置場所の温度、Ｔｍは無負荷時における絶縁油の温度上昇値、Ａは定格運転時における絶縁油の温度上昇値）より算出する手段と、
負荷率Ｕに関する絶縁紙温度Ｔｚの第１−ａの近似式
Ｔｚ≒Ｔａ＋Ｔｍ＋Ｕｙ×（Ａ＋Ｔｐ−Ｔｍ）・・・・・（式３）
（ここに、Ｔｐは定格運転時における絶縁紙と絶縁油との温度差）
に、前記（式２）より導かれる絶縁油温度Ｔｏをもたらす仮想負荷率Ｕｉの算出式、
Ｕｉ≒（（Ｔｏ−Ｔａ−Ｔｍ）／（Ａ−Ｔｍ）） （１／ｘ） ・・・・（式４）
による負荷率を代入して、絶縁油温度Ｔｏにおける絶縁紙温度Ｔｚを算出する第１−ａの絶縁紙温度算出手段と、
絶縁油温度Ｔｏに関する絶縁紙温度Ｔｚの第１−ｂの近似式
Ｔｚ≒Ｃ×Ｔｏ ・・・・・（式４）
（ここにＣは基準使用条件における前記（式３）による絶縁紙温度Ｔｚｃの前記（式２）による絶縁油温度Ｔｏｃに対する比）
により絶縁油温度Ｔｏにおける絶縁紙温度Ｔｚを算出する第１−ｂの絶縁紙温度算出手段と、
前記第２のデータ取得手段を有するものにおいて、取得した運転電流を定格電流で除した負荷率Ｕを前記（式３）に代入して負荷率Ｕにおける絶縁紙温度Ｔｚを算出する第２の絶縁紙温度算出手段と、
前記第１−ａ、第１−ｂまたは第２の絶縁紙温度算出手段のいずれかによって算出した絶縁紙温度Ｔｚと基準使用条件における絶縁紙基凖温度Ｔｚｃとの差として絶縁紙温度差Ｔｚｓを算出し、算出した絶縁紙温度差Ｔｚｓを前記（式１）に代入して前記勾配補正係数Ｒを算出し、算出した勾配補正係数Ｒを前記基準勾配Ｋｃに乗じて勾配低下の実勾配Ｋを算出する手段と、前記実勾配Ｋによって低下する重合度の時間別重合度と期日別重合度を重合度記憶部に格納する手段と、現時刻以前の複数の重合度算出に用いた複数の重合度低下勾配の平均値として現時刻以後の未来分重合度低下予想勾配を算出する手段と、入力部より入力した試算条件（変圧器の試算用設置場所温度と試算用負荷率）により、前述の重合度低下勾配算出手段に準じて試算条件における未来分重合度低下勾配を算出する手段と、前記重合度記憶部から読み出した、被診断変圧器の使用開始から現時刻までの重合度推移と、前記現時刻以後の未来分重合度低下予想勾配に沿った重合度予想推移及び、前記重合度低下試算勾配に沿った現時刻以後の重合度推移を、被診断変圧器の使用開始から数十年までの長期重合度推移グラフに表示する手段もしくは、前記長期重合度推移グラフと現時点を起点とした数日前後の短期重合度推移グラフを同時表示または交互表示する手段、を備えたことを特徴とする。In order to achieve the above object, the apparatus according to
(Here, H is one of 0.06-0.14 (1 / ° C))
Any one of the means for calculating by the above, the first data acquisition means for acquiring the insulating oil temperature To of the diagnostic transformer, and the second data means for acquiring the installation location temperature Ta and the operating current I of the diagnostic transformer Or both data acquisition means,
In what has the said 1st data acquisition means,
The temperature To of the insulating oil, the approximate expression To ≒ Ta + Tm + U x × insulating oil temperature To on Load factor U (A-Tm) ····· (Equation 2)
(Where Ta is the temperature of the transformer installation location, Tm is the temperature rise value of the insulating oil at no load, and A is the temperature rise value of the insulating oil at the rated operation),
1-a approximate expression Tz≈Ta + Tm + U y × (A + Tp−Tm) of the insulating paper temperature Tz related to the load factor U (Expression 3)
(Here, Tp is the temperature difference between insulating paper and insulating oil during rated operation)
In addition, a formula for calculating the virtual load factor Ui that leads to the insulating oil temperature To derived from (Formula 2),
Ui≈ ((To-Ta-Tm) / (A-Tm)) (1 / x) (4)
Substituting the load factor by the above, 1-a insulating paper temperature calculating means for calculating the insulating paper temperature Tz at the insulating oil temperature To ;
1-b approximate expression of insulating paper temperature Tz with respect to insulating oil temperature To
Tz≈C × To (Equation 4)
(Where C is the ratio of the insulating paper temperature Tzc according to (Equation 3) to the insulating oil temperature Toc according to (Equation 2) under the standard use conditions)
1-b insulating paper temperature calculating means for calculating the insulating paper temperature Tz at the insulating oil temperature To by:
In the second data acquisition means having the second data acquisition means, the load factor U obtained by dividing the acquired operating current by the rated current is substituted into the (Equation 3) to calculate the insulation paper temperature Tz at the load factor U. Paper temperature calculation means;
An insulating paper temperature difference Tzs is obtained as a difference between the insulating paper temperature Tz calculated by any of the first -a, 1-b, or second insulating paper temperature calculating means and the insulating paper base temperature Tzc in the standard use condition. The calculated gradient correction coefficient R is calculated by substituting the calculated insulating paper temperature difference Tzs into (Equation 1), and the calculated gradient correction coefficient R is multiplied by the reference gradient Kc to obtain the actual gradient K of the gradient decrease. Means for calculating, means for storing the degree of polymerization by time and the degree of polymerization by date of the degree of polymerization lowered by the actual gradient K, and a plurality of polymerizations used for calculating a plurality of degrees of polymerization before the current time Based on the means for calculating the future degree of polymerization decrease expected gradient after the current time as the average value of the degree decrease gradient and the trial calculation conditions (transformer trial installation location temperature and trial load ratio) input from the input unit, According to the polymerization degree decrease gradient calculation means Means for calculating a future degree of polymerization lowering gradient under trial calculation conditions, a polymerization degree transition from the start of use of the diagnostic transformer to the current time read from the degree of polymerization storage unit, and future future polymerization after the current time The expected degree of polymerization along the expected decrease in degree of polymerization and the degree of polymerization after the current time along the estimated degree of decrease in degree of polymerization are shown in the long-term degree of degree transition graph from the start of use of the diagnostic transformer to several decades. It is characterized by comprising means for displaying or means for simultaneously or alternately displaying the long-term polymerization degree transition graph and the short-term polymerization degree transition graph of several days starting from the present time.
本発明の方法によれば、日本国内で使用される変圧器全般にわたり、変圧器の使用開始から現在までの重合度劣化状況を連続的に示すことで使用条件の急激な悪化による重合度の加速的低下状況を見逃すこと無く重合度低下経緯と変圧器運転条件の良否評価を常時行うことが可能となり、変圧器運転条件の改善を適時に行って変圧器劣化に起因する事故発生の未然防止ができる。 According to the method of the present invention, over the entire transformer used in Japan, the degree of polymerization is accelerated by sudden deterioration of the use conditions by continuously showing the degree of polymerization degree deterioration from the start of use of the transformer to the present. It is possible to constantly evaluate the degree of polymerization reduction and the quality of transformer operating conditions without overlooking the state of degradation, and improve transformer operating conditions in a timely manner to prevent accidents caused by transformer deterioration. it can.
以下、添付図面に従って本発明に係る変圧器選定を実施するための最良の形態について詳説する。 Hereinafter, the best mode for carrying out selection of a transformer according to the present invention will be described in detail with reference to the accompanying drawings.
図１は、変圧器絶縁紙重合度の経時的低下推移グラフとして日本国内で公表されている図６及び図７を基にして、本発明に係る重合度低下基準勾配の例を示したもので、直線１ａを前記重合度低下推移グラフのうち最小勾配を表示している図７の重合度上限側の直線（運転開始時の重合度が９００で、低下勾配が１２．５／年）とし、直線１ｂを前記重合度低下推移グラフのうち最大勾配を表示している図８の重合度下限側の直線（運転開始時の重合度が９００で、低下勾配が５０／年）とし、前記最小勾配直線１ａと最大勾配直線１ｂの中間の直線１ｃを中間の勾配（運転開始時の重合度が９００で、低下勾配が前記基準勾配Ｋ（２５／年））とし、前記１ａ、１ｂ、１ｃのうちのいずれか一つの直線の勾配を重合度低下基準勾配Ｋｃとしている。FIG. 1 shows an example of a polymerization degree decrease reference gradient according to the present invention, based on FIGS. 6 and 7 published in Japan as a time-dependent decrease transition graph of transformer insulation paper polymerization degree. , The straight line 1a is a straight line on the upper limit side of the degree of polymerization in FIG. 7 displaying the minimum gradient in the degree-of-polymerization transition graph (the degree of polymerization at the start of operation is 900, the decrease gradient is 12.5 / year), The
変圧器設置場所基準温度Ｔａｃは、気象庁公表データによる過去４０年間の年間平均気温の、北海道地区における８℃と、九州地区における１６℃と、両地区平均１２℃より、基準勾配Ｋｃを図１の１ａとする場合は設置場所基準温度Ｔａｃを８℃、基準勾配Ｋｃを図１の１ｃとする場合は前記変圧器設置場所の基準温度Ｔａｃを１２℃、基準勾配Ｋｃを図１の１ｂとする場合は前記変圧器設置場所の基準温度Ｔａｃを１６℃、としている。 Transformer installation reference temperature Tac is based on the annual average temperature for the past 40 years according to data published by the Japan Meteorological Agency, 8 ° C in Hokkaido, 16 ° C in Kyushu, and 12 ° C in both regions. In the case of 1a, the installation location reference temperature Tac is 8 ° C., and the reference gradient Kc is 1c in FIG. 1. When the reference temperature Tac of the transformer installation location is 12 ° C. and the reference gradient Kc is 1b in FIG. Has a reference temperature Tac of 16 ° C. at the place where the transformer is installed.
変圧器運転基準負荷率Ｕｃは、図８に示す変圧器負荷率の産業別調査表に１日当たりとして記載されている２９０例の負荷率の分布が正規分布であるとした場合の平均負荷率３７．３％と標準偏差値σ＝８．９３％より平均値±２σで算出した、最低負荷率１９．５％と、最大負荷率５５．２％より、基準勾配Ｋｃを図１の１ａとする場合の基準負荷率Ｕｃを１９．５％、基準勾配Ｋｃを図１の１ｃとする場合の基準負荷率Ｕｃを前記最低負荷率１９．５％時の絶縁油温度と前記最大負荷率５５．２％時の絶縁油温度の中間となる温度をもたらす（式４）による仮想負荷率、基準勾配Ｋｃを図１の１ｂとする場合の基準負荷率Ｕｃを５５．２％、として適用している。The transformer operation reference load factor Uc is an average load factor 37 when the distribution of load factors of 290 cases described as per day in the transformer load factor industry survey table shown in FIG. 8 is a normal distribution. The reference gradient Kc is defined as 1a in FIG. 1 from the minimum load factor of 19.5% and the maximum load factor of 55.2% calculated from the average value ± 2σ from the standard deviation value σ = 8.93%. When the reference load factor Uc is 19.5% and the reference gradient Kc is 1c in FIG. 1, the reference load factor Uc is the insulating oil temperature at the minimum load factor 19.5% and the maximum load factor 55.2. The virtual load factor according to (Equation 4) that brings about a temperature intermediate between the insulating oil temperatures at the time of%, and the reference load factor Uc when the reference gradient Kc is 1b in FIG. 1 is 55.2%.
絶縁紙基準温度Ｔｚｃは、（式３）に前記設置場所基準温度Ｔａｃと、前記基準負荷率Ｕｃを適用した場合の絶縁紙温度を適用している。The insulation paper reference temperature Tzc is the insulation paper temperature when the installation location reference temperature Tac and the reference load factor Uc are applied to (Equation 3).
図２は、本発明による負荷率Ｕに対する絶縁油温度Ｔｏと絶縁紙温度Ｔｚの近似特性図で、（式２）及び（式３）に、設置場所温度Ｔａを１２℃、無負荷時の絶縁紙温度上昇値Ｔｍを６℃、定格運転時の絶縁油温度上昇値Ａを３０℃、ｘを２乗、ｙを１．８乗、定格運転時の絶縁湯と絶縁紙の温度差Ｔｐを１５℃、とした、
Ｔｏ≒１２＋６＋Ｕ２×（３０−６） ・・・・（式５）
Ｔｚ≒１２＋６＋Ｕ１．８×（３０＋１５−６）・・・・（式６）
を適用して、公表されている（図９）の試験データに近似させた例を示している。FIG. 2 is an approximate characteristic diagram of the insulating oil temperature To and the insulating paper temperature Tz with respect to the load factor U according to the present invention. In (Equation 2) and (Equation 3), the installation place temperature Ta is 12 ° C., and the insulation is performed at no load. Paper temperature rise value Tm is 6 ° C, insulation oil temperature rise value A during rated operation is 30 ° C, x is squared, y is 1.8th power, and temperature difference Tp between insulating hot water and insulating paper during rated operation is 15 ℃
To≈12 + 6 + U 2 × (30−6) (Expression 5)
Tz ≒ 12 + 6 + U 1.8 × (30 + 15- 6) ···· ( Formula 6)
Is applied to approximate the published test data (FIG. 9).
勾配補正係数Ｒの算出式である前記（式１）中のＨは、絶縁物の熱劣化に関するアレニウスの半減則によるもので、Ａ種絶縁材料への適合性が高いとされる８℃半減則の場合のＨ＝０．０８６６４を採択した
Ｒ＝１／ｅｘｐ（−０．８６６４×Ｔｚｓ）・・・・・（式７）
を適用している。H in (Formula 1), which is a formula for calculating the gradient correction coefficient R, is based on Arrhenius's half law regarding thermal degradation of insulators, and is an 8 ° C half law that is highly compatible with Class A insulating materials. R = 1 / exp (−0.8664 × Tzs) in which H = 0.08664 is adopted in the case of (Equation 7)
Has been applied.
第２のデータ取得手段における変圧器設置場所の温度Ｔａの取得は、設置場所近辺温度の測定もしくは、設置地域の気象庁気温データに気温と設置場所温度との差を加算する方法によるものとしている。 The acquisition of the temperature Ta of the transformer installation location in the second data acquisition means is based on the measurement of the temperature in the vicinity of the installation location or the method of adding the difference between the temperature and the installation location temperature to the meteorological agency temperature data of the installation area.
図３は、本発明による変圧器劣化状況の長期間表示グラフ３０と短期間表示グラフ３１を重ねた複合表示グラフの例で、実線２１は被診断変圧器の使用開始時から現時刻までの重合度推移を示しており、現時刻の時間別重合度Ｊｈ２を、
Ｊｈ２＝Ｊｈ１―Δｈ ・・・・（式８）
（ただし、Ｊｈ１は現時刻より１時間前の時間別重合度、Δｈは後述の（式９）に示す１時間前から現時刻までの重合度低下分）
Δｈ＝Ｋｃｊ×Ｒ ・・・・（式９）
（ただし、Ｋｃｊは後述の（式１０）に示す１時間あたりの基準勾配）
Ｋｃｊ＝Ｋｃ／８７６０＝０．００２８５４ ・・・（式１０）
によって算出し、算出した時間別重合度の日別最終値である期日別重合度を基にした期間代表重合度（例えば１０日毎最終値や月毎最終値等）による経緯で示している。FIG. 3 is an example of a composite display graph in which a long-
Jh 2 = Jh 1 −Δh (Equation 8)
(However, Jh 1 is the hourly polymerization degree one hour before the current time, and Δh is the degree of polymerization reduction from one hour before to the current time shown in (Equation 9) described later)
Δh = Kcj × R (Equation 9)
(However, Kcj is a reference gradient per hour shown in (Equation 10) described later)
Kcj = Kc / 8760 = 0.005854 (Expression 10)
It is shown by the history of the period representative polymerization degree (for example, the final value every 10 days, the final value every month, etc.) based on the daily degree of polymerization, which is the daily final value of the calculated degree of hourly polymerization.
図３中の現時刻以後の重合度低下予想推移を示す破線２２の勾配Ｋｙは、当日と数日前の複数の勾配の平均値としている。 In FIG. 3, the gradient Ky of the
図３中の現時刻以後の重合度低下試算勾配を示す２点鎖線２３の勾配Ｋｔは、前述の第２の絶縁紙温度算出手段以降の手段より算出している。 The gradient Kt of the two-
前記予想勾配Ｋｙや試算勾配Ｋｔにより低下する重合度が寿命判断値に達するまでの年数は、予想勾配Ｋｙや試算勾配Ｋｔを年あたりの勾配とする場合、現在の重合度と寿命判断重合度との差を予想勾配Ｋｙ、または試算勾配Ｋｔで除したものとなる。 The number of years until the degree of polymerization that decreases due to the predicted gradient Ky or the estimated gradient Kt reaches the life judgment value is determined as follows: Is divided by the estimated gradient Ky or the estimated gradient Kt.
既に運転中の変圧器の運転途中から劣化表示を行う場合、運転開始から現時刻までの絶縁油温度履歴が有る場合は、前記第１の絶縁紙温度算出手段によって絶縁紙温度Ｔｚを逐次演算し、前記絶縁油温度履歴が無い場合は、設置場所温度履歴と運転負荷率履歴より、前記第２の絶縁紙温度算出手段以降の算出手段によって現時刻の時間別重合度を算出し、以後、図５における時間別重合度記憶部への格納や次なる時間別重合度演算以降の処理過程フローに入る。 When the deterioration display is performed from the middle of the operation of the transformer that is already in operation, and there is an insulating oil temperature history from the start of operation to the current time, the insulating paper temperature Tz is sequentially calculated by the first insulating paper temperature calculating means. In the absence of the insulating oil temperature history, the hourly polymerization degree at the current time is calculated by the calculating means after the second insulating paper temperature calculating means from the installation place temperature history and the operating load factor history. 5 enters the process flow after the storage in the hourly polymerization degree storage section and the next hourly polymerization degree calculation.
被診断変圧器について、別の寿命診断方法による重合度や過大電流通電経緯等による見直し重合度が示され、その値が妥当と判断される場合は、現時点の期日別重合度を前記提示による重合度に置き換え、以後、図５における時間別重合度記憶部への格納や次なる時間別重合度演算以降の処理過程フローに入る。 For the transformer to be diagnosed, the degree of polymerization according to another life diagnosis method or the review degree of polymerization due to overcurrent flow, etc. is shown. After that, the process flow after the storage in the hourly polymerization degree storage unit in FIG.
図４は、本発明の実施例による変圧器劣化状況表示装置の構成を示す構成図で、変圧器絶縁油温度を収集するデータ収集部５１と、重合度演算部５２ａと、未来分重合度演算部５２ｂや余寿命演算部５２ｃを持つ演算処理部５２と、重合度記憶部５３と、重合度経緯グラフを作成するグラフ作成処理部５４と、重合度経緯グラフを表示する表示部５５と、被診断変圧器の定格電流や試算条件等を与える設定部５６と、期日や時刻等を与える制御部５７等により構成される。 FIG. 4 is a configuration diagram showing the configuration of a transformer deterioration status display device according to an embodiment of the present invention, in which a data collection unit 51 that collects transformer insulation oil temperature, a polymerization degree calculation unit 52a, and a future polymerization degree calculation. A
図５は、本発明における変圧器劣化状況表示装置の処理過程を示すフロー図で、被診断変圧器の絶縁油温度や運転電流等を取得するデータ取得部５１から、収集データを基に時間別重合や期日別重合度を算出する重合度演算部５２ａを経て、算出した前記時間別重合度を時刻毎に、前記期日別重合度を期日毎に格納する記憶部５３から、未来分重合度演算部５２ｂへの複数の時間別重合度や複数の期日別重合度の転送、重合度推移グラフ作成処理部５４を経て表示部５５に至るまでの処理フロー等を示している。 FIG. 5 is a flowchart showing the processing process of the transformer deterioration status display device according to the present invention. From the data acquisition unit 51 that acquires the insulation oil temperature, operating current, etc. of the transformer to be diagnosed, it is classified according to time. The degree of future polymerization is calculated from the
図６は、ＪＥＭ１４６３−１９９３「変圧器用絶縁紙の平均重合度評価基準」解説図４に記載の運転年数と平均重合度の関係を示すグラフで、グラフ中に示されたデータ群包絡線のうち、重合度が高い側の実線を本発明における最良使用条件における重合度経緯に相当するものとしている。 FIG. 6 is a graph showing the relationship between the number of years of operation and the average degree of polymerization described in JEM 1463-1993 “Evaluation criteria for average degree of polymerization of insulating paper for transformers” in FIG. 4, and among the data group envelopes shown in the graph The solid line on the higher degree of polymerization corresponds to the degree of polymerization under the best use conditions in the present invention.
図７は、メーカ技術資料（平成９年１月、日立製作所テクニカルノート、変圧器編「油入変圧器の経年劣化について」に記載の運転年数と重合度の関係を示すグラフで、グラフ中に示された線のうち、最大勾配の直線を本発明における最悪使用条件における重合度経緯に相当するものとしている。 Figure 7 is a graph showing the relationship between the number of years of operation and the degree of polymerization described in the manufacturer's technical document (January 1997, Hitachi Technical Note, Transformer Edition “Aging deterioration of oil-filled transformers”). Among the lines shown, the straight line with the maximum gradient corresponds to the degree of polymerization in the worst use condition in the present invention.
図８は、日本国内で公表されている変圧器負荷率の業種別調査表（平成１４年４月、日本電機工業会、総合エネルギー調査会、変圧器判断基準小委員会調査結果）で、表中に１日あたりとして記載されている負荷率２９０データを本発明における重合度算出用負荷率範囲に引用している。 Fig. 8 is a table of surveys of transformer load factors by industry published in Japan (April 2002, Japan Electrical Manufacturers' Association, General Energy Research Committee, Transformer Judgment Standards Subcommittee Survey Results). The load factor 290 data described as per day is quoted in the load factor range for calculating the degree of polymerization in the present invention.
図９は、変圧器の使用負荷率に対する絶縁油と巻線の温度上昇に関する公表データの一例で、特開２００１−２９１６２６、図１０に示されたグラフの例である。 FIG. 9 is an example of published data regarding the temperature rise of the insulating oil and the windings with respect to the load factor of use of the transformer, and is an example of the graph shown in Japanese Patent Application Laid-Open No. 2001-291626 and FIG.
Ａ ・・・定格運転時の絶縁油温度上昇値
Ｃ ・・・基準条件における絶縁紙温度の絶縁油温度に対する比
Ｔａ・・・被診断変圧器設置場所の温度
Ｔａｃ・・・変圧器設置場所の基準温度
Ｔｐ・・・定格運転時の絶縁紙と絶縁油との温度差
Ｔａｔ・・・試算用変圧器設置場所温度
Ｔｍ・・・無負荷時の絶縁油温度上昇値
Ｔｏ・・・運転時の絶縁油温度
Ｔｏｃ・・・基準使用条件における絶縁油温度
Ｔｚ・・・運転時の絶縁紙温度
Ｔｚｃ・・・基準使用条件における絶縁紙基準温度
Ｔｚｓ・・・運転時の絶縁紙温度と絶縁紙基準温度との絶縁紙温度差
Ｔｚｓｔ・・・試算条件における絶縁紙温度と基準絶縁紙温度との絶縁紙温度差
Ｉ ・・・被診断変圧器の運転電流
Ｕ ・・・負荷率
Ｕｃ・・・基準負荷率
Ｕｉ・・・仮想負荷率
Ｕｔ・・・試算用負荷率
Ｋ ・・・重合度低下実勾配
Ｋｃ・・・重合度低下基準勾配
Ｋｃｊ・・・１時間当たり重合度低下基準勾配
Ｋｙ・・・重合度低下予想勾配
Ｋｔ・・・重合度低下試算勾配
Ｒ ・・・勾配補正係数
Ｊｈ２・・・現時刻の重合度
Ｊｈ１・・・現時刻より１時間前の重合度
１ａ・・・最小勾配重合度低下直線
１ｂ・・・最大勾配重合度低下直線
１ｃ・・・中間勾配重合度低下直線
２１・・・現時刻までの重合度低下推移
２２・・・現時刻以後の重合度低下予想推移
２３・・・試算条件における現時刻以後の重合度低下推移
３０・・・変圧器劣化状況の長期間表示グラフ
３１・・・変圧器劣化状況の短期間表示グラフ
５０・・・変圧器劣化状況表示装置
５１・・・データ取得部
５２・・・演算処理部、
５２ａ・・・重合度演算部
５２ｃ・・・余寿命演算部
５２ｂ・・・未来分重合度演算部
５３・・・記憶部
５４・・・グラフ作成処理部
５５・・・表示部
５６・・・設定部
５７・・・制御部A ・ ・ ・ Insulating oil temperature rise during rated operation
C: Ratio of insulating paper temperature to insulating oil temperature in reference condition Ta ... Tac of installation location of diagnostic transformer Tac ... Reference temperature of transformer installation location Tp ... Insulation paper at rated operation Temperature difference with insulating oil Tat ... Temporary transformer installation location temperature
Tm: Insulating oil temperature rise value when no load To: Insulating oil temperature during operation
Toc: Insulating oil temperature Tz under the reference usage conditions ... Insulating paper temperature Tzc during operation ... Insulation paper reference temperature Tzs under reference usage conditions ... Insulation paper temperature during operation and insulating paper reference temperature Insulating paper temperature difference Tzst ... Insulating paper temperature difference between the insulating paper temperature and the reference insulating paper temperature in the trial calculation conditions I ... Operating current U of the diagnostic transformer ... Load factor Uc ... Reference load factor
Ui ... Virtual load factor Ut ... Trial load factor K ... Degradation degree actual gradient Kc ... Degree of polymerization decrease reference gradient Kcj ... Degree of polymerization degree decrease per hour Ky ... Polymerization Estimated degree of decrease in gradient Kt ... Estimated slope of decrease in polymerization degree R ... Gradient correction factor Jh 2 ... Degree of polymerization at current time Jh 1 ... Degree of
52a... Polymerization
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| JP2008124146A (en) * | 2006-11-09 | 2008-05-29 | Kansai Electric Power Co Inc:The | Method and apparatus for estimating degradation level of oil-filled electric equipment |
| JP2012160670A (en) * | 2011-02-02 | 2012-08-23 | Chugoku Electric Power Co Inc:The | Deterioration diagnosis device of oil-immersed transformer |
| JP2012182245A (en) * | 2011-02-28 | 2012-09-20 | Tohoku Electric Power Co Inc | Remaining life assessment method of power transformer using press board or winding insulating paper |
| JP6251861B1 (en) * | 2017-03-13 | 2017-12-27 | 義和 寺上 | Transformer degradation status display device |
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| JP3516962B2 (en) * | 1997-06-03 | 2004-04-05 | 三菱電機株式会社 | Degradation evaluation method for insulating paper |
| JP2008124146A (en) * | 2006-11-09 | 2008-05-29 | Kansai Electric Power Co Inc:The | Method and apparatus for estimating degradation level of oil-filled electric equipment |
| JP2012160670A (en) * | 2011-02-02 | 2012-08-23 | Chugoku Electric Power Co Inc:The | Deterioration diagnosis device of oil-immersed transformer |
| JP2012182245A (en) * | 2011-02-28 | 2012-09-20 | Tohoku Electric Power Co Inc | Remaining life assessment method of power transformer using press board or winding insulating paper |
| JP6251861B1 (en) * | 2017-03-13 | 2017-12-27 | 義和 寺上 | Transformer degradation status display device |
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| CN114280503A (en) * | 2021-12-24 | 2022-04-05 | 深圳供电局有限公司 | Method for evaluating functional age and aging state of transformer |
| CN114280503B (en) * | 2021-12-24 | 2023-12-15 | 深圳供电局有限公司 | Transformer function age and aging state evaluation method |
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