JP4400293B2 - Insulation degradation diagnosis method for electrical equipment - Google Patents
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Description
本発明は、電気機器の絶縁劣化診断方法に関するものである。 The present invention relates to an insulation degradation diagnosis method for electrical equipment.
回転機等の電気機器においては、絶縁劣化による故障が発生すると、当該機器の復旧に要する時間と費用以外に、社会的に大きな損失が発生するため、従来からこの故障を未然に防ぐための絶縁劣化診断方法の開発が行われている。
特に電気機器のうちでも、回転機の巻線交換には多大な時間と費用がかかるため、巻線の寿命を適切に予測し、計画的に更新することが重要となる。
回転機の絶縁劣化は、物理的劣化と化学的劣化との和によって表される。ここで物理的劣化要因としては、ヒートサイクルや電磁振動に伴う機械的なものと、コロナによる電気的なものがある。また、化学的劣化要因としては、吸湿や加水分解による環境と熱的なものがある。
In electrical equipment such as rotating machines, when a failure occurs due to insulation deterioration, a large social loss occurs in addition to the time and cost required to restore the equipment. Deterioration diagnostic methods are being developed.
Especially in electrical equipment, it takes a lot of time and money to replace the windings of a rotating machine. Therefore, it is important to properly predict the life of the windings and update them systematically.
The insulation deterioration of a rotating machine is represented by the sum of physical deterioration and chemical deterioration. Here, the physical deterioration factors include mechanical ones associated with heat cycles and electromagnetic vibrations, and electric ones due to corona. Further, chemical deterioration factors include the environment due to moisture absorption and hydrolysis and thermal factors.
上記絶縁劣化条件をもとに診断がおこなわれるが、回転機の固定子巻線に対する非破壊試験としては、固定子巻線非破壊絶縁劣化診断試験（以下、従来試験法という）が存在する。また、非特許文献１や特許文献１のようなものが公知となっている。この特許文献１のものは、絶縁層を構成する樹脂の加水分解生成物量をイオンクロマトグラフ分析、若しくは赤外線吸収分析法によって測定することにより絶縁層の劣化状態を検出するものであり、非特許文献１のものは、成極指数、誘電正接、最大放電電荷量等を注目した検討結果を示したものである。
図９は従来法による絶縁診断項目と劣化現象の相関図を示したものである。
同図から明らかなように、絶縁材料のボイド、はくりといった物理的劣化については従来法で検知可能であるが、材料変質等の化学的劣化については把握することができない。
また、各文献で記載されているように、近年、これらに関連して回転機の絶縁劣化診断の課題とされていることは、物理的な劣化が単独で進行した際には従来法で評価できるが、物理的と化学的な劣化が同時進行すると、化学的な劣化が物理的な劣化指標（Qmax.△tanδ.△I）に影響を与えるため、結果として真の劣化進行よりも過小評価になる場合がある。
特にポリエステル樹脂を使用した回転機用含浸樹脂は、水と熱により加水分解劣化により材料の変質が生じて絶縁材料の機能が満足しなくなり、終には機器破壊する。このため、劣化進行の度合いを適切に把握する方法の開発が強く要望されている。
FIG. 9 shows a correlation diagram between the insulation diagnosis items by the conventional method and the deterioration phenomenon.
As is clear from the figure, physical deterioration such as voids and peeling of the insulating material can be detected by a conventional method, but chemical deterioration such as material alteration cannot be grasped.
In addition, as described in each document, in recent years, it has been considered that the problem of diagnosis of insulation deterioration of rotating machines in relation to these is evaluated by the conventional method when physical deterioration progresses alone. However, if physical and chemical degradation progress simultaneously, the chemical degradation will affect the physical degradation index (Qmax. △ tanδ. △ I), resulting in an underestimation over the true progress of degradation. It may become.
In particular, the impregnating resin for a rotating machine using a polyester resin is deteriorated by hydrolysis and degradation due to water and heat, so that the function of the insulating material is not satisfied, and the equipment is eventually destroyed. For this reason, there is a strong demand for the development of a method for appropriately grasping the degree of progress of deterioration.
したがって、本発明が目的とするところは、効率的な手順によって加水分解の度合いを簡易的に適切に把握できる絶縁劣化診断方法を提供することにある。 Therefore, an object of the present invention is to provide an insulation deterioration diagnosis method capable of easily and appropriately grasping the degree of hydrolysis by an efficient procedure.
本発明の第１は、ポリエステル樹脂を被試験材料とし、加速試験によって被試験材料の加水分解生成物量から絶縁劣化度を診断するものにおいて、
前記加速試験時間に対する被試験材料の表面に析出した白色の析出物の大きさを測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに前記析出物の大きさより絶縁劣化の進行度を判定することを特徴としたものである。
The first of the present invention uses polyester resin as a material to be tested, and diagnoses the degree of insulation deterioration from the amount of hydrolysis product of the material to be tested by an accelerated test.
While measuring the size of the white precipitate deposited on the surface of the material to be tested with respect to the accelerated test time, a criterion is prepared in advance based on the relationship between the retention rate and time by the dielectric breakdown voltage test. Based on the size of the precipitate, the degree of progress of the insulation deterioration is determined.
本発明の第２は、析出物の最大径が０．０２ｍｍ以下は劣化度小、析出物の最大径が０．０２〜０．１ｍｍは劣化度中、析出物の最大径が０．１ｍｍ以上では劣化度大と判定することを特徴としたものである。 In the second aspect of the present invention, the maximum diameter of the precipitate is 0.02 mm or less, the degree of deterioration is small, and the maximum diameter of the precipitate is 0.02 to 0.1 mm, while the maximum diameter of the precipitate is 0.1 mm or more. Is characterized by determining that the degree of deterioration is large.
本発明の第３は、ポリエステル樹脂を被試験材料とし、加速試験によって被試験材料の加水分解生成物量から絶縁劣化度を診断するものにおいて、
前記加速試験時間に対する単位試料当たりの有機酸類生成濃度（ｍｇ／Ｌ）をＩＣによって測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定された有機酸濃度（ｍｇ／Ｌ）によって絶縁劣化の進行度を判定することを特徴としたものである。
In the third aspect of the present invention, a polyester resin is used as a material to be tested, and the degree of insulation deterioration is diagnosed from the amount of hydrolysis products of the material to be tested by an accelerated test.
The organic acid generation concentration per unit sample (mg / L) with respect to the accelerated test time is measured by IC, and a determination criterion is created in advance based on the relationship between the retention rate and time in the dielectric breakdown voltage test. The degree of progress of insulation deterioration is determined based on the organic acid concentration (mg / L) measured originally.
本発明の第４は、測定された有機酸量（ｍｇ／Ｌ）が０．１５以下は劣化度小、有機酸量０．１５〜１．０は劣化度中、有機酸量１．０以上では劣化度大と判定することを特徴としたものである。 In the fourth aspect of the present invention, the measured amount of organic acid (mg / L) is 0.15 or less, the degree of deterioration is small, and the amount of organic acid 0.15 to 1.0 is the degree of deterioration, while the amount of organic acid is 1.0 or more. Is characterized by determining that the degree of deterioration is large.
本発明の第５は、ポリエステル樹脂を被試験材料とし、加速試験によって被試験材料の加水分解生成物量から絶縁劣化度を診断するものにおいて、
前記ＦＴ−ＩＲにての測定結果に基づく被試験材料の吸光度比を求め、かつ加速試験時間に対する吸光度比を求めると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定された吸光度比の大きさによって絶縁劣化の進行度を判定することを特徴としたものである。
In the fifth aspect of the present invention, a polyester resin is used as a material to be tested, and the degree of insulation deterioration is diagnosed from the amount of hydrolysis products of the material to be tested by an acceleration test.
Obtain the absorbance ratio of the material to be tested based on the measurement results in the FT-IR, obtain the absorbance ratio with respect to the accelerated test time, and create a criterion based on the relationship between retention rate and time in the dielectric breakdown voltage test in advance. In addition, the degree of progress of insulation deterioration is determined based on the magnitude of the absorbance ratio measured based on this determination criterion.
本発明の第６は、吸光度比は、有機酸の吸収スペクトル１７１０ｃｍ−１をポリエステルの吸収スペクトル１７４０ｃｍ−１にて除して求め、この値が０．３７以下では劣化度小、吸光度比０．３７〜０．６は劣化度中、吸光度比０．６以上では劣化度大と判定することを特徴としたものである。 In the sixth aspect of the present invention, the absorbance ratio is obtained by dividing the organic acid absorption spectrum 1710 cm −1 by the polyester absorption spectrum 1740 cm −1. 37 to 0.6 are characterized in that the deterioration degree is determined to be large when the absorbance ratio is 0.6 or more during the deterioration degree.
本発明の第７は、ポリエステル樹脂を被試験材料とし、加速試験によって被試験材料の加水分解生成物量から絶縁劣化度を診断するものにおいて、
前記加速試験時間に対する被試験材料のｐＨ値を測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定されたｐＨ値によって絶縁劣化の進行度を判定することを特徴としたものである。
In the seventh aspect of the present invention, a polyester resin is used as a material to be tested, and the degree of insulation deterioration is diagnosed from the amount of hydrolysis products of the material under test by an accelerated test.
The pH value of the material to be tested with respect to the accelerated test time is measured, and a criterion is prepared in advance based on the relationship between the retention rate and the time in the dielectric breakdown voltage test, and the pH value measured based on the criterion is used. It is characterized by determining the progress of insulation deterioration.
本発明の第８は、ｐＨ値の大きさが、６．７以下では劣化度小、ｐＨ６．７〜６．５は劣化度中、ｐＨ値６．５以上では劣化度大と判定することを特徴としたものである。 In the eighth aspect of the present invention, it is determined that the degree of deterioration is small when the pH value is 6.7 or less, the degree of deterioration is pH 6.7 to 6.5, and the degree of deterioration is high when the pH value is 6.5 or more. It is a feature.
本発明の第９は、ポリエステル樹脂を被試験材料とし、加速試験によって被試験材料の加水分解生成物量から絶縁劣化度を診断するものにおいて、
前記加速試験時間に対する被試験材料の表面析出物の大きさ、単位試料当たりの有機物酸生成濃度、吸光度比及びｐＨ値のうちの任意数の組み合わせで絶縁劣化の進行度を判定することを特徴としたものである。
The ninth of the present invention uses polyester resin as a material to be tested, and diagnoses the degree of insulation deterioration from the amount of hydrolysis products of the material to be tested by an accelerated test.
The progress of insulation degradation is determined by a combination of any number of the size of the surface precipitate of the material to be tested with respect to the accelerated test time, the organic acid generation concentration per unit sample, the absorbance ratio, and the pH value. It is a thing.
以上のとおり、本発明によれば、被試験材料の表面析出物の大きさ、単位試料当たりの有機物酸生成濃度、吸光度比及びｐＨ値の各測定においてそれぞれ加水分解の進行度と絶縁耐力との関係が明かにしたことにより、個々の測定によって絶縁劣化の進行度を判定することが可能となると共に、時間や費用及び精度を勘案しながら現状にもっとも適した任意の組み合わせで診断できるので、簡易的に効率よく寿命判断ができるものである。 As described above, according to the present invention, the progress of hydrolysis and the dielectric strength in each measurement of the size of the surface precipitate of the material under test, the organic acid production concentration per unit sample, the absorbance ratio, and the pH value, respectively. By clarifying the relationship, it becomes possible to determine the degree of progress of insulation deterioration by individual measurement, and it is possible to diagnose with any combination most suitable for the current situation taking time, cost and accuracy into consideration, so it is easy The life can be judged efficiently.
本発明は、加水分解の進行度と絶縁耐力の関係を明確にするたるに以下のようなポリエステル樹脂に対する加速試験を行った。
加速条件として、プレッシャークッカー試験（ＰＣＴ；１２１℃９８％ＲＨ）とし、試験は絶縁破壊試験とした。また、試験片は、二重ガラス巻線（寸法２．４×１３ｍｍ）にガラステープをハーフラップ一重で巻いたものにポリエステル樹脂を含浸した。破壊条件としては気中雰囲気におけるＡＣ破壊とした。
加水分解に使用した測定装置として、表面観察にはマイクロスコープを、分析測定にはフーリェ変換赤外分光分析装置（ＦＴ−ＩＲ）とイオンクロマトグラフィー（ＩＣ）を、また、ｐＨにはｐＨ計をそれぞれ用いた。図１〜図６はその結果である。
In order to clarify the relationship between the degree of progress of hydrolysis and the dielectric strength, the present invention was subjected to the following accelerated test on the polyester resin.
The acceleration condition was a pressure cooker test (PCT; 121 ° C. 98% RH), and the test was a dielectric breakdown test. The test piece was impregnated with a polyester resin in a double glass winding (dimension 2.4 × 13 mm) in which a glass tape was wound in a single half wrap. The destruction condition was AC destruction in an air atmosphere.
As a measuring device used for hydrolysis, a microscope is used for surface observation, a Fourier transform infrared spectroscopic analyzer (FT-IR) and ion chromatography (IC) are used for analytical measurement, and a pH meter is used for pH. Each was used. 1 to 6 show the results.
図１は縦軸に絶縁破壊保持率（％）をとり、横軸にＰＣＴ時間をとったＢＤＶ
である。この図１を基に、劣化度を判別するために図７のような判断基準表を設定した。すなわち、ＢＤＶ保持率が７５％以上の場合には劣化度は小で、健全状態である。ＢＤＶ保持率７５〜５０％では劣化度中で、更新計画の作成時期である。ＢＤＶ保持率５０％以下では劣化度大で寿命時期とする。判断基準表のＢＤＶ保持率は、ＩＥＣ．ｐｕｂ．２１６の劣化度５０％を準拠とし、７５〜５０％及び７５％以上の区分範囲については出願人の経験則に基づいて作成した。
図２は表面観察時のＰＣＴ時間と析出物寸法との関係を示したものである。試験を開始してよりある時間になると、試験片の表面に白い析出物が確認されて加水分解が進行していることが判明され、時間の経過に伴って徐々に大きくなる。ＰＣＴ時間の８時間で最大析出物の直径が０．０２ｍｍであり、図７で示す判断基準表によると、この８時間は保持率７５％以上の劣化度小の範囲である。
つまり、析出された析出物の直径が０．０２ｍｍの大きさでは健全状態となる。
次に、例えば４８時間経過後の析出物の大きさは０．１ｍｍとなり、ＢＤＶ保持率５０％近辺であるので、析出物大径０．１ｍｍでは更新計画作成時期に相当する。
更に時期が経過し、例えば９６時期になると析出物径は０．１５ｍｍになる。９６時期のＢＤＶ保持率は５０％以下であり、析出物径０．１５ｍｍでは寿命状態に入ったと診断される。
Figure 1 shows BDV with dielectric breakdown retention (%) on the vertical axis and PCT time on the horizontal axis.
It is. Based on this FIG. 1, in order to discriminate the degree of deterioration, a judgment standard table as shown in FIG. 7 is set. That is, when the BDV retention rate is 75% or more, the degree of deterioration is small and the sound state is established. When the BDV retention rate is 75 to 50%, the deterioration degree is in progress, and the update plan is being created. When the BDV retention rate is 50% or less, the deterioration level is large and the life time is assumed. The BDV retention rate in the criteria table is IEC. pub. Based on the empirical rules of the applicant, the range of 75 to 50% and 75% or more was made based on 50% degradation degree of 216.
FIG. 2 shows the relationship between the PCT time during the surface observation and the precipitate size. When a certain time has passed since the start of the test, a white precipitate was confirmed on the surface of the test piece, and it was found that hydrolysis was progressing, and gradually increased with the passage of time. The diameter of the maximum precipitate is 0.02 mm at 8 hours of PCT time, and according to the criteria table shown in FIG.
That is, when the diameter of the deposited precipitate is 0.02 mm, a healthy state is obtained.
Next, for example, the size of the precipitate after 48 hours is 0.1 mm, and the BDV retention rate is in the vicinity of 50%. Therefore, when the precipitate has a large diameter of 0.1 mm, it corresponds to the update plan creation time.
Further, the time elapses. For example, when the time reaches 96, the precipitate diameter becomes 0.15 mm. The BDV retention rate in the 96th period is 50% or less, and it is diagnosed that the product has entered the life state when the precipitate diameter is 0.15 mm.
図３は、ＩＣによって測定された単位試料当たりの有機酸類生成濃度とＰＣＴ時間との関係図である。ここでの有機酸は、マレイン酸、リンゴ酸、フマル酸、グリコール酸、蟻酸、炭酸、酒石酸、乳酸等であり、特にリンゴ酸が劣化度合いに強い相関関係にあるため、試験ではリンゴ酸の生成濃度とした。
有機酸の生成濃度は時間と共に高くなり、判断基準表における劣化度小範囲であるＰＣＴ８時間では０．１５ｍｇ／Ｌ、劣化度中範囲である１６時間又は４８時間ではそれぞれ０．５３ｍｇ／Ｌと１．０ｍｇ／Ｌとなっている。また、劣化度大の９６時間及び１５４時間では２０．０ｍｇ／Ｌと３８．５ｍｇ／Ｌとなっている。したがって、有機酸類の生成濃度量によっても劣化度の進行状態の判別が可能となる。
FIG. 3 is a graph showing the relationship between the organic acid production concentration per unit sample and the PCT time measured by IC. The organic acids here are maleic acid, malic acid, fumaric acid, glycolic acid, formic acid, carbonic acid, tartaric acid, lactic acid, etc. Especially, malic acid has a strong correlation with the degree of deterioration, so in the test the production of malic acid Concentration.
The generation concentration of the organic acid increases with time, 0.15 mg / L for
図４はＦＴ−ＩＲ測定に基づく吸光度比よる実施例である。図６がＦＴ−ＩＲによるスペクトルパターンで、この分析結果における有機酸の吸収スペクトル（１７１０ｃｍ−１）をポリエステル吸収スペクトル（１７４０−１）で除して吸光度比を求めたものである。この吸光度比が図４で示すようにＰＣＴ時間によって変化し、健全時間内である８時間では０．３８、更新計画作成時間である４８時間では０．６０、寿命時間である９６時間以上では１．６５以上となり、この吸光度比を測定することによって劣化の度合いを判別することができる。 FIG. 4 is an example based on an absorbance ratio based on FT-IR measurement. FIG. 6 is a spectrum pattern by FT-IR, and the absorbance ratio is determined by dividing the absorption spectrum (1710 cm −1) of the organic acid in this analysis result by the polyester absorption spectrum (1740 −1). As shown in FIG. 4, this absorbance ratio varies depending on the PCT time. It is 0.38 at 8 hours within the healthy time, 0.60 at 48 hours as the update plan creation time, and 1 at 96 hours or more as the life time. The degree of deterioration can be determined by measuring the absorbance ratio.
図５は更にｐＨ値の測定によって劣化度の進行状態を判別する実施例を示したものである。
ｐＨ測定時におけるサンプルの採取方法としては、実機表面を純水で洗い流す方法や、実際の絶縁材を２ｇ程度採取して超音波洗浄を行う方法、及び表面の絶縁材を０．５ｇ程度の微量を削り落とす方法等があるが、特に精度的には絶縁材を２ｇ程度採取して超音波洗浄を行う方法が最適である。
このようにして測定されたｐＨ値は図５で明らかなように、健全時間内であるＰＣＴ８時間では６．７であり、更新計画作成時間である４８時間では６．５、寿命時間である９６時間では６．１となり、ｐＨ値によっても劣化度の進行状態を判別することが可能となる。
FIG. 5 shows an embodiment in which the progress of the degree of deterioration is further determined by measuring the pH value.
Samples can be collected at the time of pH measurement by washing the actual machine surface with pure water, collecting about 2 g of the actual insulating material and performing ultrasonic cleaning, and measuring a small amount of surface insulating material of about 0.5 g. There is a method of shaving off, etc., but in particular, a method of collecting about 2 g of an insulating material and performing ultrasonic cleaning is optimal.
As is apparent from FIG. 5, the pH value measured in this way is 6.7 for the
以上のように本発明によれば、加水分解の進行度と絶縁耐力との関係が明確となったことにより、加水分解の劣化度合いを把握して絶縁耐力との関係から残存耐力の推定が可能となる。このような寿命推定においても、条件に応じて効率よく測定することが要望される。
図８は、上記した４実施例における加水分解調査において、検討所要時間と精度を比較したもので、調査項目における判断項目、及びその所要時間を示したものである。
すなわち、外観検査においての白色析出物の有無検査は１０分の所要時間であった。また、ｐＨ＜７については６０分、以下同様にしてＦＴ−ＩＲは１８０分、ＩＣは３００分であった。したがって、劣化度の進行状態調査時においては、図８で示す個々の項目測定で判断してもよいことは勿論であるが、時間と費用、及び精度を考慮して、簡易的に効率よく複数の調査項目を実行して加水分解劣化度を把握することができる。
As described above, according to the present invention, since the relationship between the degree of hydrolysis and the dielectric strength is clarified, the degree of hydrolysis degradation can be grasped and the residual strength can be estimated from the relationship with the dielectric strength. It becomes. Even in such life estimation, it is desired to perform measurement efficiently according to conditions.
FIG. 8 is a comparison of the time required for examination and accuracy in the hydrolysis investigation in the above-described four examples, and shows the judgment items in the investigation items and the time required.
That is, the inspection for the presence or absence of white precipitates in the appearance inspection took 10 minutes. For pH <7, 60 minutes, FT-IR was 180 minutes, and IC was 300 minutes. Therefore, when examining the progress of the deterioration degree, it is of course possible to make a judgment by measuring each item shown in FIG. 8, but considering the time, cost, and accuracy, a plurality of simple and efficient methods can be used. The degree of hydrolysis degradation can be grasped by executing the survey items.
ＰＣＴ…プレッシャークッカー試験
ＦＴ−ＩＲ…フーリェ変換赤外分光分析装置
ＩＣ…イオンクロマトグラフィー
ＢＶＤ…絶縁破壊電圧試験
PCT ... Pressure cooker test
FT-IR ... Fourier transform infrared spectroscopy analyzer
IC ... Ion chromatography
BVD ... Breakdown voltage test
Claims (9)
前記加速試験時間に対する被試験材料の表面に析出した白色の析出物の大きさを測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに前記析出物の大きさより絶縁劣化の進行度を判定することを特徴とした電気機器の絶縁劣化診断方法。 Using polyester resin as the material to be tested, and diagnosing the degree of insulation deterioration from the amount of hydrolysis product of the material to be tested by an accelerated test,
While measuring the size of the white precipitate deposited on the surface of the material to be tested with respect to the accelerated test time, a criterion is prepared in advance based on the relationship between the retention rate and time by the dielectric breakdown voltage test. A method for diagnosing insulation deterioration of electrical equipment, characterized in that the degree of progress of insulation deterioration is determined based on the size of the precipitate.
前記加速試験時間に対する単位試料当たりの有機酸類生成濃度（ｍｇ／Ｌ）をＩＣによって測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定された有機酸濃度（ｍｇ／Ｌ）によって絶縁劣化の進行度を判定することを特徴とした電気機器の絶縁劣化診断方法。 Using polyester resin as the material to be tested, and diagnosing the degree of insulation deterioration from the amount of hydrolysis product of the material to be tested by an accelerated test,
The organic acid generation concentration per unit sample (mg / L) with respect to the accelerated test time is measured by IC, and a determination criterion is created in advance based on the relationship between the retention rate and time in the dielectric breakdown voltage test. A method for diagnosing insulation deterioration of electrical equipment, wherein the degree of progress of insulation deterioration is determined based on an organic acid concentration (mg / L) measured originally.
前記ＦＴ−ＩＲにての測定結果に基づく被試験材料の吸光度比を求め、かつ加速試験時間に対する吸光度比を求めると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定された吸光度比の大きさによって絶縁劣化の進行度を判定することを特徴とした電気機器の絶縁劣化診断方法。 Using polyester resin as the material to be tested, and diagnosing the degree of insulation deterioration from the amount of hydrolysis product of the material to be tested by an accelerated test,
Obtain the absorbance ratio of the material to be tested based on the measurement results in the FT-IR, obtain the absorbance ratio with respect to the accelerated test time, and create a criterion based on the relationship between retention rate and time in the dielectric breakdown voltage test in advance. A method for diagnosing insulation deterioration of electrical equipment, wherein the degree of progress of insulation deterioration is determined based on the magnitude of the absorbance ratio measured on the basis of the determination criteria.
前記加速試験時間に対する被試験材料のｐＨ値を測定すると共に、予め絶縁破壊電圧試験による保持率と時間の関係に基づいて判定基準を作成し、この判定基準をもとに測定されたｐＨ値によって絶縁劣化の進行度を判定することを特徴とした電気機器の絶縁劣化診断方法。 Using polyester resin as the material to be tested, and diagnosing the degree of insulation deterioration from the amount of hydrolysis product of the material to be tested by an accelerated test,
The pH value of the material to be tested with respect to the accelerated test time is measured, and a criterion is prepared in advance based on the relationship between the retention rate and the time in the dielectric breakdown voltage test, and the pH value measured based on the criterion is used. A method for diagnosing insulation deterioration of electrical equipment, wherein the degree of progress of insulation deterioration is determined.
前記加速試験時間に対する被試験材料の表面析出物の大きさ、単位試料当たりの有機物酸生成濃度、吸光度比及びｐＨ値のうちの任意数の組み合わせで絶縁劣化の進行度を判定することを特徴とした請求項１乃至８記載の電気機器の絶縁劣化診断方法。
Using polyester resin as the material to be tested and diagnosing the degree of insulation deterioration from the amount of hydrolysis products of the material to be tested by an accelerated test,
The progress of insulation degradation is determined by a combination of any number of the size of the surface precipitate of the material to be tested with respect to the accelerated test time, the organic acid generation concentration per unit sample, the absorbance ratio, and the pH value. The insulation deterioration diagnosis method for electrical equipment according to claim 1 to 8.
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