JP2014062858A - Remaining life assessment method of oil-immersed stationary induction apparatus - Google Patents
Remaining life assessment method of oil-immersed stationary induction apparatus Download PDFInfo
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本発明は、絶縁冷却媒体として鉱油、エステル油、シリコーン液などの液体を用い、巻線の絶縁被覆等の絶縁物として絶縁紙を用いた、鉱油入りの静止誘導電器の余寿命診断方法に関する。 The present invention relates to a method for diagnosing the remaining life of a stationary induction machine containing mineral oil using a liquid such as mineral oil, ester oil, or silicone liquid as an insulating cooling medium, and using insulating paper as an insulator such as an insulation coating of a winding.
一般に、油入変圧器などの静止誘導電器は、タンク内の鉱油などの絶縁冷却媒体中に、鉄心と、前記鉄心に装着され絶縁紙が巻回された電線からなるコイルと、コイル絶縁用及び絶縁冷却媒体の冷却通路構成用の絶縁物を備えた巻線とが浸漬されている。 Generally, a static induction appliance such as an oil-filled transformer is composed of an iron core, a coil that is mounted on the iron core and wound with insulating paper, and a coil insulation coil and an insulating cooling medium such as mineral oil in a tank. A winding provided with an insulator for cooling passage configuration of the insulating cooling medium is immersed.
このような静止誘導電器に使用されている材料のなかで、鉱油などの絶縁冷却媒体、あるいは絶縁紙などの絶縁物は経年劣化により特性が低下することが知られている。これら材料の経年劣化による特性低下が、変圧器の経年劣化の要因であり、変圧器の寿命を左右すると考えられている。 Among the materials used for such static induction appliances, it is known that the characteristics of insulating cooling media such as mineral oil or insulating materials such as insulating paper deteriorate due to aging. It is considered that the deterioration of characteristics due to aging of these materials is a factor of aging of the transformer and affects the life of the transformer.
非特許文献１には、従来の変圧器の経年劣化診断に関する基本的な考え方が記載されている。絶縁冷却媒体である鉱油については、酸素や水などが関与して経年劣化するが、その絶縁破壊電圧の低下は小さいことが知られている。変圧器製造時に適切な乾燥処理が行われ、タンク外部からの空気、水分の侵入が無ければ、通常は長期間使用することが可能である。また、経年劣化により特性が低下しても、新油と交換する、あるいは脱気ろ過処理などを行うことで、変圧器の運転に支障のない特性を維持することが可能である。 Non-Patent Document 1 describes a basic concept regarding the diagnosis of aging degradation of a conventional transformer. Mineral oil, which is an insulating cooling medium, is known to deteriorate over time due to the involvement of oxygen, water, etc., but it is known that the decrease in dielectric breakdown voltage is small. If a proper drying process is performed at the time of transformer production and there is no intrusion of air and moisture from the outside of the tank, it can be used for a long period of time. Even if the characteristics deteriorate due to deterioration over time, it is possible to maintain characteristics that do not hinder the operation of the transformer by replacing with new oil or performing degassing filtration.
一方、巻線被覆の絶縁紙については、経年劣化によって絶縁破壊電圧はほとんど低下しないのに対し、引張強度は低下し、運転を継続するうえで問題になる場合もある。例えば、変圧器巻線に雷撃や外部短絡などによるサージ電流が流れ、その際に発生する電磁機械力によって巻線被覆に引張り力が働く。この引張り力よりも絶縁紙の引張強度が低くなった場合、絶縁紙が破壊するため、絶縁紙の寿命となる。一般には、絶縁紙の巻き替えや、巻線の交換は不可能であるため、この絶縁紙の寿命が、変圧器の寿命を決めることになると考えられている。 On the other hand, with respect to the insulating paper covered with the winding, the dielectric breakdown voltage hardly decreases due to aging, whereas the tensile strength decreases, which may cause a problem in continuing the operation. For example, a surge current due to a lightning strike or an external short circuit flows through the transformer winding, and a tensile force acts on the winding coating due to the electromagnetic mechanical force generated at that time. When the tensile strength of the insulating paper becomes lower than this tensile force, the insulating paper breaks, and the life of the insulating paper is reached. In general, since it is impossible to rewind the insulating paper or replace the winding, it is considered that the life of the insulating paper determines the life of the transformer.
絶縁紙の主成分はセルロースであり、図１に示す化学構造を持つ、グルコース環が鎖状に重合した高分子材料である。 The main component of the insulating paper is cellulose, which is a polymer material having a chemical structure shown in FIG.
経年劣化により、この鎖が切れて短くなり、さらに分解してＣＯ2、ＣＯ、フルフラール、アセトンといった低分子の化合物が生成する。フルフラールの化学構造を図２に示す。 Due to aging, this chain is broken and shortened and further decomposed to produce low molecular weight compounds such as CO 2 , CO, furfural and acetone. The chemical structure of furfural is shown in FIG.
導体に巻かれた絶縁紙は折れ等があり、その引張強度を正確に測定するのは難しいことから、引張強度との相関が高いセルロースの平均重合度が劣化の指標として用いられている。しかし、運転中の変圧器において、この絶縁紙の引張強度、平均重合度を直接測定することはできない。一方、セルロースの分解生成物である、（ＣＯ2＋ＣＯ）量、フルフラール量、アセトン量などと、絶縁紙の平均重合度とは相関があることが知られている。
このことから、絶縁冷却媒体中の（ＣＯ2＋ＣＯ）量、フルフラール量、アセトン量などを測定することによって、絶縁紙の引張強度、平均重合度を間接的に評価し、変圧器の経年劣化状態を外部診断している。
Since the insulating paper wound around the conductor is bent and it is difficult to accurately measure the tensile strength, the average degree of polymerization of cellulose having a high correlation with the tensile strength is used as an indicator of deterioration. However, it is not possible to directly measure the tensile strength and average polymerization degree of this insulating paper in a transformer in operation. On the other hand, it is known that there is a correlation between the amount of (CO 2 + CO), the amount of furfural, the amount of acetone, etc., which are decomposition products of cellulose, and the average degree of polymerization of insulating paper.
From this, by measuring the amount of (CO 2 + CO), furfural, acetone, etc. in the insulating cooling medium, the tensile strength and average polymerization degree of the insulating paper are indirectly evaluated, and the aging state of the transformer Have an external diagnosis.
近年、高度経済成長期に増大した国内の変電用、あるいは配電用変圧器は経年４０年を超え、今後大量に更新時期を迎える見通しである。このため、これら高経年変圧器を診断して寿命を定量的に把握することにより、計画的に高経年変圧器をリプレースしていく必要があり、余寿命診断技術の高精度化が求められている。 In recent years, domestic transformers and distribution transformers, which have increased during the period of high economic growth, are over 40 years old and are expected to be renewed in large quantities in the future. For this reason, it is necessary to replace these high-age transformers systematically by diagnosing these high-age transformers and quantitatively grasping their lifetimes, and there is a need for high-precision remaining life diagnosis technology. Yes.
特許文献１には、絶縁油中に含まれる劣化指標成分の測定値を用いて油入電気機器の絶縁紙の平均重合度を推定し、この平均重合度により油入電気機器の劣化を診断する方法において、絶縁油中のフルフラール量、二酸化炭素及び一酸化炭素の量、水分量、酸素量、水素量の各測定値を前記劣化指標成分の測定値とし、少なくとも、前記劣化指標成分の測定値と、油入電気機器の運転履歴、保守履歴、及び、油入電気機器の設計諸元を入力因子群とし、前記絶縁紙の平均重合度を出力因子として、モデルの同定または学習を行うことにより、異なる平均重合度推定モデルを重回帰式またはニューラルネットワークによって複数構築し、診断対象である油入電気機器の前記入力因子群を前記各推定モデルにそれぞれ入力して得られた複数の平均重合度推定値を加工して、前記絶縁紙の最終的な平均重合度を推定する、変圧器の経年劣化診断方法が記載されている。 In Patent Document 1, an average degree of polymerization of insulating paper of an oil-filled electrical device is estimated using a measured value of a deterioration index component contained in the insulating oil, and deterioration of the oil-filled electrical device is diagnosed based on this average degree of polymerization. In the method, each measured value of the amount of furfural in insulating oil, the amount of carbon dioxide and carbon monoxide, the amount of moisture, the amount of oxygen, and the amount of hydrogen is taken as the measured value of the deterioration index component, and at least the measured value of the deterioration index component And by identifying or learning the model using the operating history, maintenance history, and design specifications of the oil-filled electrical device as input factor groups, and the average degree of polymerization of the insulating paper as the output factor. A plurality of different average polymerization degree estimation models are constructed by multiple regression equations or neural networks, and a plurality of averages obtained by inputting the input factor groups of the oil-filled electrical equipment to be diagnosed into the respective estimation models, respectively. And processing the Godo estimate, estimates a final average degree of polymerization of the insulating paper, aging diagnostic method of the transformer is described.
特許文献２には、油入変圧器内部の絶縁油を採取し、該絶縁油中の特定成分を分析した上で、該特定成分の量とコイル絶縁紙の平均重合度との相関関係に基づき、コイル絶縁紙の平均重合度を推定する第１種の方法（例えば、（ＣＯ2＋ＣＯ）法やフルフラール法）を行うと共に、油入変圧器内部の採取可能な絶縁物を採取し、該絶縁物の平均重合度を求めることにより、コイル絶縁紙の平均重合度を推定する第２種の方法とを行い、第１種の方法により推定されたコイル絶縁紙の平均重合度と第２種の方法により推定されたコイル絶縁紙の平均重合度との差分を求め、該差分に基づき、第１種の方法における特定成分の量とコイル絶縁紙の平均重合度との相関関係を補正し、しかる後、第１種の方法によってコイル絶縁紙の平均重合度をモニタリングすることを特徴とする、変圧器の経年劣化診断方法が記載されている。 In Patent Document 2, insulating oil inside an oil-filled transformer is sampled, and after analyzing a specific component in the insulating oil, based on the correlation between the amount of the specific component and the average degree of polymerization of the coil insulating paper. The first type of method for estimating the average degree of polymerization of coil insulating paper (for example, (CO 2 + CO) method or furfural method) is performed, and the insulating material that can be collected inside the oil-filled transformer is collected and the insulation is collected. The second type of method for estimating the average degree of polymerization of the coil insulating paper is obtained by determining the average degree of polymerization of the product, and the average degree of polymerization of the coil insulating paper estimated by the first type of method and the second type of method. A difference between the average degree of polymerization of the coil insulating paper estimated by the method is obtained, and based on the difference, the correlation between the amount of the specific component and the average degree of polymerization of the coil insulating paper in the first type method is corrected, and accordingly After that, the average degree of polymerization of the coil insulating paper was measured by the first type method. Characterized by Taringu, aging diagnostic method of the transformer is described.
特許文献１、あるいは特許文献２記載の方法は、前記絶縁紙の劣化状態を診断するにあたり、主成分であるセルロースの劣化による引張強度、平均重合度の低下を、セルロースの分解生成物である、（ＣＯ2＋ＣＯ）量、フルフラール量、アセトン量などを測定することによって推定するうえで、その精度向上を図ったものである。 The method described in Patent Document 1 or Patent Document 2 is a degradation product of cellulose, which is a degradation product of tensile strength and average polymerization degree due to deterioration of cellulose as a main component in diagnosing the deterioration state of the insulating paper. In estimating by measuring the amount of (CO 2 + CO), the amount of furfural, the amount of acetone, etc., the accuracy is improved.
一方、非特許文献２には、主として木材から得られるパルプから製造される絶縁紙には、主成分のセルロース以外に、ヘミセルロース、リグニン、樹脂分などが微量の不純物として含まれていることが記載されている。ヘミセルロースは多糖類であり、セルロースと類似の化学構造を持つことから、セルロースと同様に分解して、ＣＯ2、ＣＯ、フルフラールなどが生成すると考えられる。一方、リグニンは図３に示すように、フェニルプロパノイドが高度に脱水素重合した、複雑な樹脂状構造の物質である。 On the other hand, Non-Patent Document 2 describes that insulating paper produced mainly from pulp obtained from wood contains hemicellulose, lignin, resin, and the like as trace impurities in addition to the main component cellulose. Has been. Since hemicellulose is a polysaccharide and has a chemical structure similar to cellulose, it is considered that it decomposes like cellulose and produces CO 2 , CO, furfural, and the like. On the other hand, as shown in FIG. 3, lignin is a substance having a complicated resinous structure in which phenylpropanoid is highly dehydrogenatively polymerized.
このリグニンなどのフェニルプロパノイド由来の化合物は、絶縁紙中に含まれる量は少ないものの、絶縁紙の機械的強度に寄与すると考えられる。また、リグニンなどのフェニルプロパノイド由来の化合物は、セルロースと同様に経年劣化し、分解すると考えられる。しかしながら、リグニンなどのフェニルプロパノイド由来の化合物劣化については、絶縁紙の劣化状態を診断するうえで、考慮されていないという問題があった。また、リグニンなどのフェニルプロパノイド由来の化合物の分解生成物を指標とした、絶縁紙の経年劣化診断も行われていなかった。 The compound derived from phenylpropanoid such as lignin is considered to contribute to the mechanical strength of the insulating paper although the amount contained in the insulating paper is small. Moreover, it is thought that the compound derived from phenylpropanoids, such as lignin, deteriorates over time and decomposes like cellulose. However, there has been a problem that deterioration of compounds derived from phenylpropanoids such as lignin is not taken into account in diagnosing the deterioration state of insulating paper. In addition, aged deterioration diagnosis of insulating paper has not been performed using the decomposition product of a compound derived from phenylpropanoid such as lignin as an index.
本発明の目的は、高精度な静止誘導電器の余寿命診断方法を提供することにある。 An object of the present invention is to provide a highly accurate method for diagnosing the remaining life of a static induction appliance.
本発明は、変圧器本体内の絶縁冷却媒体中に、鉄心と、前記鉄心に装着された絶縁紙が巻回された電線からなるコイルと、コイル絶縁用絶縁体及び前記絶縁冷却媒体の冷却通路を構成する絶縁体を浸漬してなる静止誘導電器において、前記絶縁紙に含まれるリグニン（フェニルプロパノイド）由来の分解生成物を分析することにより、静止誘導電器の余寿命を診断することを特徴とする。 The present invention relates to a coil comprising an iron core and an electric wire wound with insulating paper attached to the iron core in an insulating cooling medium in a transformer body, a coil insulating insulator, and a cooling passage for the insulating cooling medium. In the static induction appliance formed by immersing the insulator constituting the structure, the remaining life of the static induction appliance is diagnosed by analyzing decomposition products derived from lignin (phenylpropanoid) contained in the insulating paper. And
本発明によれば、前記絶縁紙の構成成分であるリグニン（フェニルプロパノイド）由来の分解生成物を分析することにより、高精度に絶縁紙の劣化状態、ならびに静止誘導電器の余寿命を診断する静止誘導電器の余寿命診断方法を提供することができる。 According to the present invention, by analyzing a degradation product derived from lignin (phenylpropanoid), which is a component of the insulating paper, the deterioration state of the insulating paper and the remaining life of the static induction appliance are diagnosed with high accuracy. It is possible to provide a method for diagnosing the remaining life of a static induction appliance.
以下に本発明の実施形態について、図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本発明の余寿命診断方法を適用する絶縁冷却媒体として鉱油を用いた、鉱油入りの静止誘導電器の一例として油入変圧器を説明する。 An oil-filled transformer will be described as an example of a stationary induction device containing mineral oil using mineral oil as an insulating cooling medium to which the remaining life diagnosis method of the present invention is applied.
図４は油入変圧器を示す縦断面図である。鉄芯１の下部に取り付けた下部支持金具２の上に絶縁支持台３ａを置き、この絶縁支持台３ａ上にコイル間スペーサ４ａと円板コイル５ａを交互に積み重ねて低圧巻線６を形成している。低圧巻線６の最上部には静電シールド７ａが置かれる。低圧巻線６の外側に直線スペーサ８を当て、その外側に絶縁紙を巻回して絶縁筒９を形成し、更に、その外側に同様の直線スペーサ８と絶縁筒９を配置して主絶縁１０を形成している。 FIG. 4 is a longitudinal sectional view showing the oil-filled transformer. An insulating support base 3a is placed on the lower support fitting 2 attached to the lower part of the iron core 1, and inter-coil spacers 4a and disk coils 5a are alternately stacked on the insulating support base 3a to form a low voltage winding 6. ing. An electrostatic shield 7 a is placed on the top of the low-voltage winding 6. A linear spacer 8 is applied to the outside of the low-voltage winding 6, and an insulating paper 9 is wound around the outside to form an insulating cylinder 9. Further, a similar linear spacer 8 and insulating cylinder 9 are arranged outside the main cylinder 10. Is forming.
主絶縁１０の最も外側に位置する直線スペーサ８の外側に電線を締め付けながら巻回して円板コイル５ｂを形成し、この円板コイル５ｂとコイル間スペーサ４ｂを交互に積み重ねて高圧巻線１１を構成している。高圧巻線１１の最上部には静電シールド７ｂが設けられる。 A disk coil 5b is formed by winding an electric wire on the outer side of the linear spacer 8 located on the outermost side of the main insulation 10 to form a disk coil 5b, and the disk coil 5b and the inter-coil spacer 4b are alternately stacked to form a high voltage winding 11. It is composed. An electrostatic shield 7 b is provided on the top of the high voltage winding 11.
このように形成した低圧及び高圧巻線６、１１の上部には絶縁支持台３ｂを乗せ、更にその上に押しボルト１３を装着した上部支持金具１２を乗せて鉄芯１に取り付ける。そして、押しボルト１３で絶縁支持台３ｂに荷重を加え、低圧及び高圧巻線６、１１を締め付けて巻線本体を構成している。 The insulating support base 3b is placed on the upper portions of the low-voltage and high-voltage windings 6 and 11 formed in this way, and the upper support fitting 12 with the push bolts 13 mounted thereon is further mounted on the iron core 1. Then, a load is applied to the insulating support 3b with the push bolt 13, and the low-voltage and high-voltage windings 6 and 11 are tightened to constitute the winding body.
高圧巻線１１の上端から高圧リード線１４を引き出して高圧ブッシング１５に接続するが、その際、上部支持金具１２から、高圧リード線１４が入るような穴をあけた支持腕木１６を出し、この穴に高圧リード線１４を納めてリード線１４の途中を支持している。また、高圧リード線の周囲との絶縁距離が小さい部分についてはスペーサ１７を介して絶縁紙を巻回してリード線バリヤ１８を配置している。これらすべては鉱油２１を満たした変圧器本体２０内に収納して円板巻の変圧器巻線２２が構成されている。 The high-voltage lead wire 14 is pulled out from the upper end of the high-voltage winding 11 and connected to the high-voltage bushing 15. At this time, a support arm 16 having a hole into which the high-voltage lead wire 14 is inserted is taken out from the upper support fitting 12. The high-voltage lead wire 14 is placed in the hole and the middle of the lead wire 14 is supported. In addition, a lead wire barrier 18 is disposed by winding an insulating paper through a spacer 17 in a portion where the insulation distance from the periphery of the high voltage lead wire is small. All of these are housed in a transformer body 20 filled with mineral oil 21 to form a disk winding transformer winding 22.
絶縁用及び絶縁油の冷却通路構成用絶縁体として用いられるコイル間スペーサ４ａ、４ｂ、直線スペーサ８の材料としては従来よりクラフトパルプからなるプレスボード等のボード材が広く用いられている。 As materials for the inter-coil spacers 4a and 4b and the linear spacer 8 used as insulators for insulating and insulating oil cooling passage construction, board materials such as press boards made of kraft pulp have been widely used.
主として木材から得られるパルプから製造される絶縁紙には、主成分のセルロース以外に、ヘミセルロース、リグニン、樹脂分などが微量の不純物として含まれている。このうち、リグニンなどのフェニルプロパノイド由来の化合物は、絶縁紙中に含まれる量は少ないものの、絶縁紙の機械的強度に寄与すると考えられる。また、リグニンなどのフェニルプロパノイド由来の化合物は、セルロースと同様に経年劣化し、分解すると考えられる。
しかしながら、リグニンなどのフェニルプロパノイド由来の化合物の劣化については、絶縁紙の劣化状態を診断するうえで、考慮されていないという問題があった。また、リグニンなどのフェニルプロパノイド由来の化合物の分解生成物を指標とした、絶縁紙の経年劣化診断も行われていなかった。
Insulating paper produced mainly from pulp obtained from wood contains hemicellulose, lignin, resin, and the like as trace amounts of impurities in addition to cellulose as a main component. Of these, compounds derived from phenylpropanoids such as lignin are thought to contribute to the mechanical strength of the insulating paper, although the amount contained in the insulating paper is small. Moreover, it is thought that the compound derived from phenylpropanoids, such as lignin, deteriorates over time and decomposes like cellulose.
However, there has been a problem that deterioration of compounds derived from phenylpropanoids such as lignin is not taken into account in diagnosing the deterioration state of insulating paper. In addition, aged deterioration diagnosis of insulating paper has not been performed using the decomposition product of a compound derived from phenylpropanoid such as lignin as an index.
このため、高精度な静止誘導電器の経年劣化診断方法を提供するために鋭意検討した結果、経年劣化した変圧器から採取した鉱油中や絶縁紙中には、セルロース、ヘミセルロースの分解ではほとんど生成しない、ベンゼン環構造をもつ化合物が含まれていることを見出した。新品のプレスボードに鉱油を含浸したもの、および経年変圧器から採取したプレスボードをヘキサンで洗浄して油成分等を除去した後、トルエン／エタノール＝１／１（容量比）の混合溶媒で７ｈソックスレー抽出し、抽出物をガスクロマトグラフィ−質量分析（ＧＣ−ＭＳ）で分析した結果、ベンゼン環構造をもつ化合物としては、例えば、フェノール、トルエン、スチレン、バニリン、コニフェリルアルデヒドといった、いわゆるフェニルプロパノイド由来と考えられる分解生成物が多く含まれることがわかった。 For this reason, as a result of diligent research to provide a highly accurate method for diagnosing aging deterioration of static induction appliances, it is hardly generated by decomposition of cellulose and hemicellulose in mineral oil or insulating paper collected from aged transformers. The present inventors have found that compounds having a benzene ring structure are included. A new press board impregnated with mineral oil and a press board taken from an aged transformer are washed with hexane to remove oil components and the like, and then mixed with a mixed solvent of toluene / ethanol = 1/1 (volume ratio) for 7 hours. As a result of Soxhlet extraction and analysis of the extract by gas chromatography-mass spectrometry (GC-MS), examples of compounds having a benzene ring structure include so-called phenylpropanoids such as phenol, toluene, styrene, vanillin, and coniferyl aldehyde. It was found that many decomposition products considered to be derived are contained.
リグニンは図３に示すように、フェニルプロパノイドが高度に脱水素重合した、複雑な樹脂状構造の物質であるため、新品の絶縁紙から溶媒に溶出することはほとんど無いと考えられる。絶縁紙が経年劣化することにより、リグニンが分解し、リグニンの基本骨格であるフェニルプロパノイド由来の化合物が検出されたものと考えられる。 As shown in FIG. 3, lignin is a substance having a complicated resinous structure in which phenylpropanoids are highly dehydrogenatively polymerized. Therefore, it is considered that lignin hardly elutes into a solvent from new insulating paper. It is considered that when the insulating paper deteriorates over time, lignin is decomposed and a compound derived from phenylpropanoid, which is the basic skeleton of lignin, is detected.
検出されたベンゼン環構造由来の化合物の総量が多いほど、絶縁紙の平均重合度は低く、その引張強度が低いことがわかった。すなわち、ベンゼン環構造由来の化合物の総量によって、絶縁紙の劣化状態を推定することができ、変圧器の経年劣化診断の指標となることがわかった。 It was found that the greater the total amount of compounds derived from the benzene ring structure detected, the lower the average degree of polymerization of the insulating paper and the lower its tensile strength. In other words, it was found that the deterioration state of the insulating paper can be estimated by the total amount of the compound derived from the benzene ring structure, which is an index for aging diagnosis of the transformer.
リグニン（フェニルプロパノイド）由来の分解生成物は、紫外領域から可視領域にかけての光を吸収するため、分光光度計を用いて鉱油の光吸収スペクトルを測定することで、鉱油中のリグニン（フェニルプロパノイド）由来の分解生成物の量を推定することが可能である。 Since the degradation product derived from lignin (phenylpropanoid) absorbs light from the ultraviolet region to the visible region, the light absorption spectrum of mineral oil is measured using a spectrophotometer, so that the lignin (phenylpropanoid) in mineral oil is measured. It is possible to estimate the amount of decomposition products derived from (noid).
図５は、本発明の変圧器の経年劣化診断方法を示すフローチャート図である。リグニン（フェニルプロパノイド）由来の分解生成物を分析することによる診断が可能である。また、従来の（ＣＯ2＋ＣＯ）量、フルフラール量、アセトン量などから得られるセルロースの平均重合度を推定する手法と組み合わせて絶縁紙の劣化状態を診断することにより、さらに高精度で劣化状態を診断することも可能である。
予め絶縁紙又は絶縁体に含まれるリグニン（フェニルプロパノイド）由来の分解生成物の量と、絶縁紙の劣化状態とを関連付けておくことにより、絶縁紙又は絶縁体の分析結果に基づく絶縁紙の劣化状態が可能である。例えば、絶縁紙又は絶縁体表面の分析を定期的に行い、得られたリグニン（フェニルプロパノイド）由来の分解生成物の量の分析値が所定値以上になった場合に、静止誘導電器に用いている絶縁紙の劣化状態が寿命に達したと判定する。
絶縁紙の劣化状態の管理方法を説明するグラフを図６に示す。図６には運転時間に対して、分析によって得られる絶縁紙又は絶縁体に含まれるリグニン（フェニルプロパノイド）由来の分解生成物の量をプロットしたものと、静止誘導電器で用いている絶縁紙の劣化状態を判定するために、予め適宜設定されたリグニン（フェニルプロパノイド）由来の分解生成物の量の所定値（破線）とが示されている。絶縁紙の劣化が進んでいると判定された場合、機器の運転停止や、日常の点検項目において機器の異常の有無を確認したり、絶縁油を採取してさらに状態を詳細に分析する。また、劣化の度合いに応じて、定期点検時等機器を停止した際に、静止誘導電器巻線、または静止誘導電器を交換することで静止誘導電器の故障を未然に防ぐことが可能となる。
FIG. 5 is a flowchart showing a method for diagnosing aged deterioration of a transformer according to the present invention. Diagnosis is possible by analyzing degradation products derived from lignin (phenylpropanoid). In addition, by diagnosing the deterioration state of insulating paper in combination with the conventional method of estimating the average degree of polymerization of cellulose obtained from the amount of (CO 2 + CO), the amount of furfural, the amount of acetone, etc., the deterioration state can be determined with higher accuracy. Diagnosis is also possible.
By associating the amount of degradation products derived from lignin (phenylpropanoid) contained in the insulating paper or the insulator in advance with the deterioration state of the insulating paper, the insulating paper based on the analysis result of the insulating paper or the insulating paper A degraded state is possible. For example, when the analysis of the surface of insulating paper or insulator is periodically performed and the analysis value of the amount of decomposition products derived from lignin (phenylpropanoid) exceeds a predetermined value, it is used for a static induction appliance It is determined that the deteriorated state of the insulating paper has reached the end of its life.
FIG. 6 is a graph for explaining a management method of the deterioration state of the insulating paper. FIG. 6 plots the amount of decomposition product derived from lignin (phenylpropanoid) contained in the insulating paper or the insulating material obtained by analysis with respect to the operating time, and the insulating paper used in the static induction appliance. In order to determine the deterioration state, a predetermined value (broken line) of the amount of decomposition product derived from lignin (phenylpropanoid), which is appropriately set in advance, is shown. If it is determined that the deterioration of the insulation paper is progressing, stop the operation of the equipment, check whether there is any abnormality in the daily inspection items, collect the insulating oil, and analyze the state in detail. In addition, when the equipment is stopped at the time of periodic inspection or the like according to the degree of deterioration, it is possible to prevent a failure of the static induction electric device by replacing the static induction winding or the static induction electric device.
図７は、本発明の実施例２を示すブロック図である。図７において、３０は油入静止誘導電器に用いられる絶縁体と同じ材質の絶縁体からなる分析用サンプルであり、鉱油を透過可能なカプセル３１内に収納され、分析の際に油入静止誘導電器内から取り出され、油入静止誘導電器外部の分析装置で分析される。これにより、直接絶縁体を分析するのに比較して、簡便に分析を行うことができる。 FIG. 7 is a block diagram showing Embodiment 2 of the present invention. In FIG. 7, reference numeral 30 denotes an analysis sample made of an insulator made of the same material as the insulator used for the oil-filled stationary induction electric appliance, which is housed in a capsule 31 that is permeable to mineral oil, and oil-filled stationary induction for analysis. It is taken out from the electric appliance and analyzed by an analyzer outside the oil-filled stationary induction electric appliance. Thereby, compared with analyzing an insulator directly, it can analyze simply.
１…鉄芯、６…低圧巻線、８…直線スペーサ、９…絶縁筒、１０…主絶縁、１１…高圧巻線、１７…スペーサ、１９…絶縁被覆、２０…変圧器本体、２１…鉱油、２２…変圧器巻線、３０…分析用サンプル、２１…カプセル。 DESCRIPTION OF SYMBOLS 1 ... Iron core, 6 ... Low voltage winding, 8 ... Linear spacer, 9 ... Insulating cylinder, 10 ... Main insulation, 11 ... High voltage winding, 17 ... Spacer, 19 ... Insulation coating, 20 ... Transformer main body, 21 ... Mineral oil 22 ... transformer winding, 30 ... analytical sample, 21 ... capsule.
Claims (7)
前記絶縁紙に含まれるリグニン由来の分解生成物を分析することを特徴とする静止誘導電器の余寿命診断方法。 In an insulating cooling medium, an iron core, a coil made of an electric wire wound with insulating paper attached to the iron core, a coil insulating insulator, and an insulator constituting a cooling passage of the insulating cooling medium are immersed. In the method for diagnosing the remaining life of static induction appliances,
A method for diagnosing the remaining life of a static induction appliance, comprising analyzing a decomposition product derived from lignin contained in the insulating paper.
前記リグニン由来の分解生成物の総量が多いほど、前記静止誘導電器が劣化していると判断することを特徴とする静止誘導電器の余寿命診断方法。 In claim 1,
The remaining life diagnosis method for static induction appliances, wherein the static induction appliance is judged to be deteriorated as the total amount of decomposition products derived from lignin increases.
前記リグニン由来の分解生成物はフェニルプロパノイド由来の化合物であることを特徴とする静止誘導電器の余寿命診断方法。 In claim 1 or 2,
The method for diagnosing the remaining life of a static induction appliance, wherein the degradation product derived from lignin is a compound derived from phenylpropanoid.
請求項１乃至３のいずれかにおいて、
分光光度計を用いて前記絶縁冷却媒体の光吸収スペクトルを測定することにより、前記絶縁冷却媒体中のリグニン由来の分解生成物を定量することを特徴とする静止誘導電器の余寿命診断方法。
In any one of Claims 1 thru | or 3,
A method for diagnosing the remaining life of a static induction appliance, wherein a decomposition product derived from lignin in the insulating cooling medium is quantified by measuring a light absorption spectrum of the insulating cooling medium using a spectrophotometer.
前記絶縁冷却媒体中の（ＣＯ2＋ＣＯ）量、フルフラール量またはアセトン量から得られるセルロースの平均重合度を推定することを特徴とする静止誘導電器の余寿命診断方法。 In any one of Claims 1 thru | or 4,
A method for diagnosing the remaining life of a static induction appliance, wherein the average degree of polymerization of cellulose obtained from the amount of (CO 2 + CO), furfural or acetone in the insulating cooling medium is estimated.
前記静止誘導電器に前記絶縁体と同一材料からなる分析用サンプルを着脱自在に設け、前記分析用サンプルに含まれるリグニン由来の分解生成物を分析することにより絶縁紙の劣化状態を診断することを特徴とする静止誘導電器の余寿命診断方法。 In an insulating cooling medium made of mineral oil in the transformer body, an iron core, a coil made of an electric wire wound with insulating paper attached to the iron core, an insulator for coil insulation, and a cooling passage for the insulating cooling medium In the method for diagnosing the remaining life of a static induction appliance formed by immersing the insulator constituting
An analysis sample made of the same material as the insulator is detachably provided on the static induction electric appliance, and the degradation state of the insulating paper is diagnosed by analyzing a decomposition product derived from lignin contained in the analysis sample. A method for diagnosing the remaining life of static induction appliances.
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