JP4280189B2 - Oil-immersed transformer deterioration diagnosis method and diagnostic agent kit - Google Patents
Oil-immersed transformer deterioration diagnosis method and diagnostic agent kit Download PDFInfo
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- 230000006866 deterioration Effects 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 8
- 238000003745 diagnosis Methods 0.000 title claims description 4
- 229940039227 diagnostic agent Drugs 0.000 title claims description 4
- 239000000032 diagnostic agent Substances 0.000 title claims description 4
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- HORQAOAYAYGIBM-UHFFFAOYSA-N 2,4-dinitrophenylhydrazine Chemical compound NNC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O HORQAOAYAYGIBM-UHFFFAOYSA-N 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 8
- 239000003929 acidic solution Substances 0.000 claims description 5
- 238000011161 development Methods 0.000 claims description 3
- 238000009007 Diagnostic Kit Methods 0.000 claims 1
- 238000000605 extraction Methods 0.000 description 19
- 150000001299 aldehydes Chemical class 0.000 description 18
- 239000002904 solvent Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000004128 high performance liquid chromatography Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000344 soap Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002405 diagnostic procedure Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- KMVPXBDOWDXXEN-UHFFFAOYSA-N 4-nitrophenylhydrazine Chemical compound NNC1=CC=C([N+]([O-])=O)C=C1 KMVPXBDOWDXXEN-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WVVOBOZHTQJXPB-UHFFFAOYSA-N N-anilino-N-nitronitramide Chemical compound [N+](=O)([O-])N(NC1=CC=CC=C1)[N+](=O)[O-] WVVOBOZHTQJXPB-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- HKOOXMFOFWEVGF-UHFFFAOYSA-N phenylhydrazine Chemical compound NNC1=CC=CC=C1 HKOOXMFOFWEVGF-UHFFFAOYSA-N 0.000 description 1
- 229940067157 phenylhydrazine Drugs 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Description
本発明は、油入変圧器の経年劣化度をフルフラールの含有量に応じて診断することのできる診断方法および該診断方法に使用される診断剤キットに関する。 The present invention relates to a diagnostic method capable of diagnosing the degree of aging of an oil-filled transformer according to the content of furfural, and a diagnostic agent kit used in the diagnostic method.
〔発明の背景〕
一般的に油入変圧器では、コイルの絶縁のために紙（絶縁紙）が用いられている。この絶縁紙は、放熱作用に優れるものの、経年により劣化するという欠点を有する。絶縁紙が劣化すると、例えば油入変圧器の近くに落雷した場合や外部短絡事故が発生した場合に、大電流が油入変圧器に流れ込み、電線間に生じた電磁機械力で絶縁紙が砕けてコイルがショートし、油入変圧器が使用不能となることがある。従って、油入変圧器では絶縁紙の劣化度を診断することが非常に重要である。
BACKGROUND OF THE INVENTION
Generally, in an oil-filled transformer, paper (insulating paper) is used for insulating a coil. Although this insulating paper has an excellent heat dissipation function, it has a drawback that it deteriorates with age. When insulation paper deteriorates, for example, when lightning strikes near an oil-filled transformer or when an external short circuit accident occurs, a large current flows into the oil-filled transformer and the insulation paper is crushed by the electromagnetic mechanical force generated between the wires. If the coil is short-circuited, the oil-filled transformer may become unusable. Therefore, in an oil-filled transformer, it is very important to diagnose the degree of deterioration of the insulating paper.
〔従来の技術〕
従来より、絶縁紙が劣化するとその重合度が低下してフルフラールが生成し、これが絶縁油中に溶出することが知られている。また、絶縁紙の引張り強度、平均重合度残率及びフルフラールの生成量には相関関係があることも知られている。従って、絶縁油中に溶出したフルフラールの量を測定すれば、絶縁紙の劣化度、即ち油入変圧器の劣化度を診断することができる。従来、この絶縁油中に溶出したフルフラールの量の測定は、高速液体クロマトグラフィーを使用して行っていた。しかしながら、高速液体クロマトグラフィーの取り扱いは煩雑であり、また高速液体クロマトグラフィー自体のコストが高いという問題があった。そこでｐ−ニトロフェニルヒドラジン溶液を使用する方法が提供されている（例えば特許文献１参照）。
[Conventional technology]
Conventionally, it is known that when the insulating paper is deteriorated, the degree of polymerization is reduced to generate furfural, which is eluted in the insulating oil. It is also known that there is a correlation between the tensile strength of the insulating paper, the average polymerization degree residual rate, and the amount of furfural produced. Therefore, if the amount of furfural eluted in the insulating oil is measured, the degree of deterioration of the insulating paper, that is, the degree of deterioration of the oil-filled transformer can be diagnosed. Conventionally, the amount of furfural eluted in this insulating oil has been measured using high performance liquid chromatography. However, the handling of high performance liquid chromatography is complicated, and the cost of high performance liquid chromatography itself is high. Therefore, a method using a p-nitrophenylhydrazine solution is provided (see, for example, Patent Document 1).
上記ｐ−ニトロフェニルヒドラジン溶液を使用する診断方法では、絶縁油中のフルフラールをアセトニトリル溶液によって抽出する。この方法では絶縁油の分解によって生成する他のアルデヒドも抽出され、フルフラールの量の測定を妨害し正確な診断が困難である、と云う問題点がある。
上記絶縁油の分解によって生成する他のアルデヒドはＣ１〜Ｃ１８の範囲のアルデヒドであり、特にＣ数の高いアルデヒドの割合が多く、該アルデヒドがフルフラールの量の測定を妨害する。
In the diagnostic method using the p-nitrophenylhydrazine solution, furfural in insulating oil is extracted with an acetonitrile solution. This method has a problem that other aldehydes generated by the decomposition of the insulating oil are also extracted, which hinders measurement of the amount of furfural and makes accurate diagnosis difficult.
Other aldehydes produced by the decomposition of the insulating oil are aldehydes in the range of C1 to C18, and particularly the proportion of aldehydes having a high C number is high, and the aldehyde interferes with the measurement of the amount of furfural.
本発明は上記従来の課題を解決するための手段として、絶縁油中のフルフラールを水によって抽出し、該抽出液に２，４−ジニトロフェニルヒドラジン酸性溶液を添加してフルフラールと２，４−ジニトロフェニルヒドラジンとを定量的に反応せしめ、次いでアルカリを添加して該抽出液を発色せしめ、該発色によって油入変圧器の劣化を診断する油入変圧器劣化診断方法を提供するものである。
上記水には塩化ナトリウムが添加されていることが望ましく、また該絶縁油は油入変圧器内の絶縁紙から溶出したものである。
更に本発明では、水と、２，４−ジニトロフェニルヒドラジン溶液と、アルカリとを組合わせてなる油入変圧器劣化診断剤キットが提供される。上記水には塩化ナトリウムが添加されていることが望ましい。
The present invention as means for solving the conventional problems described above, the furfural in insulating oil and thus extracted into water, and furfural by adding 2,4-dinitrophenylhydrazine acidic solution the extract 2,4 An oil-filled transformer deterioration diagnosing method for diagnosing the deterioration of an oil-filled transformer by reacting quantitatively with dinitrophenylhydrazine and then adding alkali to cause the extract to develop a color, and the color development.
Sodium chloride is preferably added to the water, and the insulating oil is eluted from the insulating paper in the oil-filled transformer.
Furthermore, the present invention provides an oil-filled transformer deterioration diagnostic agent kit comprising a combination of water, a 2,4-dinitrophenylhydrazine solution, and an alkali. It is desirable that sodium chloride is added to the water .
〔作用〕
本発明にあっては、絶縁油中のフルフラール（２−フルフラール）を水によって抽出する。上記水を抽出溶媒として使用すると、絶縁油中の種々なアルデヒドのうちＣ数の大きな高分子量のアルデヒドは、上記水に難溶であり、溶媒中に殆ど溶出しない。
更に絶縁油はＣ１８の炭化水素を主成分としており、したがって劣化によって生成するアルデヒドはＣ１８以下のものであることが推測されるが、絶縁油中のアルデヒドの大部分は高分子量のものである。
したがって上記水を使用すると、絶縁油中の高分子量のアルデヒドの大部分を除去することが出来、フルフラールを精度よく分析することが出来る。
本発明で使用する２，４−ジニトロフェニルヒドラジンは酸性溶液中で、フルフラールと反応して２，４−ジニトロフェニルヒドラゾンを生成し、アルカリを添加してアルカリ性にすれば赤色に発色する。この反応は定量的に行われるから、抽出液中にフルフラールのみ存在する場合には、フルフラールを定量することが出来る。
更に絶縁油は劣化によって金属石けんを生成する。上記金属石けんは界面活性作用を有するので、絶縁油中に金属石けんが存在すると、絶縁油と抽出溶媒との分離が困難になる。このような場合には抽出溶媒中に塩化ナトリウムを添加すれば、絶縁油と抽出溶媒との分離が容易になる。
[Action]
In the present invention, thus extracting furfural in insulating oil (2 furfural) in water. When the water is used as an extraction solvent, a high molecular weight aldehyde having a large C number among various aldehydes in the insulating oil is hardly soluble in the water and hardly dissolves in the solvent.
Furthermore, the insulating oil is mainly composed of C18 hydrocarbons. Therefore, it is estimated that the aldehyde produced by the degradation is C18 or less, but most of the aldehyde in the insulating oil has a high molecular weight.
Therefore, when the above water is used, most of the high molecular weight aldehyde in the insulating oil can be removed, and furfural can be analyzed with high accuracy.
The 2,4-dinitrophenylhydrazine used in the present invention reacts with furfural in an acidic solution to produce 2,4-dinitrophenylhydrazone, and when it is made alkaline by adding alkali, it develops a red color. Since this reaction is performed quantitatively, when only furfural is present in the extract, furfural can be quantified.
Furthermore, insulating oil produces metal soap due to deterioration. Since the metal soap has a surface-active action, if the metal soap is present in the insulating oil, it is difficult to separate the insulating oil from the extraction solvent. In such a case, if sodium chloride is added to the extraction solvent, the insulating oil and the extraction solvent can be easily separated.
〔効果〕
したがって本発明では、高価な装置を使用することなく、簡便かつ正確に油入変圧器の劣化度を判断することが出来る。
〔effect〕
Therefore, in the present invention, the deterioration degree of the oil-filled transformer can be determined easily and accurately without using an expensive device.
以下、本発明を詳細に説明する。
本発明の対象とする変圧器は、コイルの絶縁のために絶縁紙が使用されており、かつ絶縁油が使用されている油入変圧器である。該絶縁紙としては、一般的にセルロースからなるものが用いられる。また、絶縁油としては、一般的にナフテン系炭化水素、芳香族炭化水素およびパラフィン系炭化水素を含む炭化水素混合物や、パラフィン系炭化水素からなるものが用いられ、これら絶縁油であれば本発明の診断を行うことができる。
Hereinafter, the present invention will be described in detail.
The transformer which is the subject of the present invention is an oil-filled transformer in which insulating paper is used for coil insulation and insulating oil is used. As the insulating paper, one made of cellulose is generally used. Further, as the insulating oil, generally, a hydrocarbon mixture containing naphthenic hydrocarbon, aromatic hydrocarbon and paraffinic hydrocarbon, or one made of paraffinic hydrocarbon is used. Can be diagnosed.
本発明では、まず油入変圧器の絶縁油に対して、フルフラール分の抽出処理を施す。通常、油入変圧器から絶縁油を一定量取り出し、それに対してフルフラールの抽出を行う。絶縁油を取り出す量は特に限定されず、劣化診断を行うことのできる範囲であればよい。一般的には、２〜２００ml程度で足りる。
絶縁油からのフルフラールの抽出は、常法によって行うことができる。例えば、絶縁油に所定の溶剤を加え、よく振とうする。抽出に使用する溶媒としては、水を使用する。
上記水を抽出溶媒として使用することによって、前記したように絶縁油中のフルフラールを選択的に抽出することが出来る。絶縁油と該水との体積比は、１：１〜１：４であるのが好ましい。また、振とうは１〜３分間程度行うのが好ましい。
In the present invention, first, the furfural component is extracted from the insulating oil of the oil-filled transformer. Usually, a certain amount of insulating oil is taken out from the oil-filled transformer, and furfural is extracted from it. The amount of the insulating oil taken out is not particularly limited as long as the deterioration diagnosis can be performed. Generally, about 2 to 200 ml is sufficient.
Extraction of furfural from insulating oil can be performed by a conventional method. For example, a predetermined solvent is added to the insulating oil and shaken well. Water is used as a solvent used for extraction .
By using the water as an extraction solvent, the furfural in the insulating oil can be selectively extracted as described above. The volume ratio of the insulating oil and the water is 1: 1 to 1: is preferably 4. The shaking is preferably performed for about 1 to 3 minutes.
更に該水に塩化ナトリウムを添加する場合には、上記水１００mlに対して通常塩化ナトリウムを０．５〜１．５ｇ添加する。 When further adding sodium chloride to the water is added 0.5~1.5g normal sodium chloride with respect to the water 100 ml.
上記抽出処理を行った後、静置して、フルフラールを抽出した溶媒層（抽出処理液）を分離し採取する。前記したように絶縁油が劣化により金属石けんを含有する場合でも、該水に塩化ナトリウムが添加されていると、絶縁油と水との分離は明確に行なわれ、抽出処理液の採取は容易になる。該抽出処理液は下層に分離する。抽出処理液が得られたら、その抽出処理液を所望なれば濾過した後、２，４−ジニトロフェニルヒドラジンを添加混合する。抽出処理液中にフルフラールが存在すれば、該フルフラールと２，４−ジニトロフェニルヒドラジンとは酸性条件下で反応を起こす。
２，４−ジニトロフェニルヒドラジンは、一般的には希塩酸水溶液に溶解して使用する。上記２，４−ジニトロフェニルヒドラジン溶液の濃度は、１〜５ｇ／Ｌであるのが好ましく、特に２ｇ／Ｌであるのが好ましい。
希塩酸水溶液としては通常０．５〜１．５質量％塩酸水溶液を使用する。
After performing the extraction process, the mixture is allowed to stand to separate and collect the solvent layer (extraction process liquid) from which furfural has been extracted. Even when containing a metal soap insulating oil due to deterioration as described above, when the sodium chloride to the water is added, the insulating oil separation and water explicitly performed, collecting the extraction solution easily Become. The extraction processing liquid is separated into lower layers. When an extraction treatment liquid is obtained, the extraction treatment liquid is filtered if desired, and then 2,4-dinitrophenylhydrazine is added and mixed. If furfural is present in the extraction treatment liquid, the furfural and 2,4-dinitrophenylhydrazine react under acidic conditions.
2,4-Dinitrophenylhydrazine is generally used by dissolving in dilute hydrochloric acid aqueous solution. The concentration of the 2,4-dinitrophenylhydrazine solution is preferably 1 to 5 g / L, and particularly preferably 2 g / L.
As the dilute hydrochloric acid aqueous solution, a 0.5 to 1.5 mass% hydrochloric acid aqueous solution is usually used.
抽出処理液と上記２，４−ジニトロフェニルヒドラジン酸性溶液との混合比（体積）は、１：１〜１：４であるのが好ましい。
上記抽出処理液に２，４−ジニトロフェニルヒドラジン酸性溶液を添加した後は室温で３０分程度放置して反応を進行させてもよいが、６０〜８０℃で３０秒〜２分加熱するのが好ましい。このように加熱することにより、フルフラールと２，４−ジニトロフェニルヒドラジンとの反応を効率よく進行させることができる。
The mixing ratio (volume) of the extraction treatment liquid and the 2,4-dinitrophenylhydrazine acidic solution is preferably 1: 1 to 1: 4.
After the 2,4-dinitrophenylhydrazine acidic solution is added to the extraction treatment solution, the reaction may be allowed to proceed for about 30 minutes at room temperature, but heating at 60 to 80 ° C. for 30 seconds to 2 minutes is preferred. preferable. By heating in this way, the reaction between furfural and 2,4-dinitrophenylhydrazine can proceed efficiently.
次に、上記反応液にアルカリを添加する。アルカリとしては、水酸化カリウム、水酸化ナトリウム等を使用することができ、好ましくは、水酸化カリウムを使用する。
このアルカリは、一般的には３〜７質量％の水溶液として使用する。
Next, an alkali is added to the reaction solution. As the alkali, potassium hydroxide, sodium hydroxide or the like can be used, and potassium hydroxide is preferably used.
This alkali is generally used as a 3 to 7% by mass aqueous solution.
上記反応液とアルカリ水溶液との混合比（体積）は、１：２〜１：４であるのが好ましく、特に１：３であるのが好ましい。
以上のように上記反応液とアルカリとを混合すると、フルフラールと２，４−ジニトロフェニルヒドラジンとの反応物が赤色に発色する。
従って、この発色の程度を測定することにより、絶縁紙、ひいては油入変圧器の劣化度を診断することができる。
The mixing ratio (volume) of the reaction solution and the aqueous alkali solution is preferably 1: 2 to 1: 4, and particularly preferably 1: 3.
As described above, when the reaction solution and the alkali are mixed, the reaction product of furfural and 2,4-dinitrophenylhydrazine develops a red color.
Therefore, by measuring the degree of color development, it is possible to diagnose the degree of deterioration of the insulating paper and thus the oil-filled transformer.
例えば、フルフラールの含有量が既知の絶縁油について、本発明の方法に従って発色させた標準試料を用意しておけば、この標準試料の色と比較することにより、診断対象の絶縁油中のフルフラールの含有量が分かり、油入変圧器の劣化度を診断することができる。
色の比較は目視によって行うこともできるが、例えば分光光度計を使用すれば、さらに正確に行うことができる。分光光度計を使用する場合、４７０nmにおける吸光度を測定するのが好ましい。このように分光光度計を使用すると、絶縁油中における１０ppm 以下の含有量のフルフラールを測定することができる。
本発明では、標準試料、あるいはそれを用いた検量線を作製しておけば、実際に劣化度診断を行う際に高速液体クロマトグラフィーを使用する必要がないため、低コストで、また煩雑な操作を行うことなく、油入変圧器の劣化度の診断を行うことができる。
For example, if a standard sample colored in accordance with the method of the present invention is prepared for an insulating oil with a known furfural content, the color of the furfural in the insulating oil to be diagnosed can be compared with the color of this standard sample. The content can be understood and the deterioration degree of the oil-filled transformer can be diagnosed.
The color comparison can be performed by visual observation, but can be performed more accurately by using, for example, a spectrophotometer. When using a spectrophotometer, it is preferable to measure the absorbance at 470 nm. When the spectrophotometer is used in this way, it is possible to measure furfural having a content of 10 ppm or less in the insulating oil.
In the present invention, if a standard sample or a calibration curve using the standard sample is prepared, it is not necessary to use high performance liquid chromatography when actually diagnosing the degree of deterioration. The deterioration degree of the oil-filled transformer can be diagnosed without performing the operation.
〔アルデヒド類の除去試験〕
水によって絶縁油中のフルフラール抽出の際のアルデヒド除去を検討した。
試験は使用油１０mlに対して純水１０mlを加え１分間の振とうにより抽出を行った後静置し、抽出層の非水系メンブランフィルター（０．４５μｍ）ろ液に２，４−ジニトロフェニルヒドラジン溶液を加え、高速液体クロマトグラフに導入した。使用油中のアルデヒドはアセトニトリルを抽出溶媒として同様の操作を行って評価した。尚、高速液体クロマトグラフでの分析は炭素数１〜９のアルデヒドを対象とした。
試験結果を表１に示す。
[Aldehyde removal test]
Removal of aldehyde during extraction of furfural in insulating oil with water was studied.
The test was allowed to stand was extracted by shaking of pure water 1 0 ml pressurized example 1 minute for use oil 10 ml, nonaqueous membrane filter extraction layer (0.45 [mu] m) to the filtrate 2,4-dinitro A phenylhydrazine solution was added and introduced into a high performance liquid chromatograph. The aldehyde in the oil used was evaluated by the same operation using acetonitrile as an extraction solvent. In addition, the analysis by a high performance liquid chromatograph was intended for aldehydes having 1 to 9 carbon atoms.
The test results are shown in Table 1.
表１によれば、使用油に含まれるアルデヒド類は炭素数１（ホルムアルデヒド）から存在し、分子量の増加とともに含有量が増える傾向が認められる。
純水での除去を行った試料には、すべてのアルデヒドに対して除去効果が見られた。
また純水を溶媒として使用すると、Ｃ４以上のアルデヒドは全く抽出されず、Ｃ３以下のアルデヒドも極く微量しか抽出されないことが確認出来る。
According to Table 1, aldehydes contained in the oil used are present from carbon number 1 (formaldehyde), and the tendency for the content to increase with increasing molecular weight is recognized.
The sample that had been removed with pure water had a removal effect on all aldehydes.
Moreover, when pure water is used as a solvent, it can be confirmed that C4 or higher aldehyde is not extracted at all, and that a very small amount of C3 or lower aldehyde is extracted .
本発明では油入り変圧器の劣化度を簡便かつ正確に診断することが出来る。 In the present invention, the deterioration degree of the oil-filled transformer can be easily and accurately diagnosed .
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| JP2008224563A (en) * | 2007-03-15 | 2008-09-25 | Mitsubishi Electric Corp | Method for analysis of carbonyl compounds in oil |
| KR100995709B1 (en) | 2008-12-23 | 2010-11-19 | 한국전기연구원 | Inrush Transformer Load Management System |
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| KR102336644B1 (en) * | 2019-08-21 | 2021-12-08 | 한국전력공사 | Method for quantifying of furan concentration, method and apparatus for diagnosing transformer deterioration using the same |
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| JP2669262B2 (en) * | 1992-05-06 | 1997-10-27 | 三菱電機株式会社 | Diagnostic method and diagnostic device for oil-filled electrical equipment |
| JP2986675B2 (en) * | 1994-03-25 | 1999-12-06 | 三菱電機株式会社 | Device and method for diagnosing service life of oil-filled electrical equipment |
| JP3264427B2 (en) * | 1997-02-28 | 2002-03-11 | 財団法人中部電気保安協会 | Deterioration agent and method of deterioration of oil-immersed transformer |
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