JPH0562405B2 - - Google Patents
Info
- Publication number
- JPH0562405B2 JPH0562405B2 JP60103288A JP10328885A JPH0562405B2 JP H0562405 B2 JPH0562405 B2 JP H0562405B2 JP 60103288 A JP60103288 A JP 60103288A JP 10328885 A JP10328885 A JP 10328885A JP H0562405 B2 JPH0562405 B2 JP H0562405B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- pour point
- pma
- vegetable
- oils
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003921 oil Substances 0.000 claims description 20
- 235000019198 oils Nutrition 0.000 claims description 20
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 17
- 239000008158 vegetable oil Substances 0.000 claims description 17
- -1 alkyl methacrylate Chemical compound 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000010735 electrical insulating oil Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 6
- 235000019484 Rapeseed oil Nutrition 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- 235000012343 cottonseed oil Nutrition 0.000 description 2
- 239000002385 cottonseed oil Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 235000012424 soybean oil Nutrition 0.000 description 2
- 239000003549 soybean oil Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Organic Insulating Materials (AREA)
Description
産業上の利用分野
本発明はコンデンサ、変圧器などの油入電気機
器に用いる植物油の低温性状を改善し、高信頼性
の油入電気機器を提供しようとするものである。
従来の技術とその問題点
従来、電気絶縁油として鉱油、アルキルベンゼ
ン、アルキルジフエニールエタン、アルキルナフ
タレンなどの炭化水素系絶縁油が用いられていた
が、これらは熱的に比較的安定である反面、比誘
電率が低いことから、高い比誘電率を有する植物
油を使用することが考えられていた。植物油は炭
化水素系絶縁油より比誘電率が3.1〜4.5と高く、
さらに油浸材料として幅広く用いられているポリ
プロピレンフイルム（以下PPフイルムという）
の膨潤は小さい、また油浸コンデンサなどにおけ
る誘電体層間への含浸性も向上する特徴がある。
植物油には、種々のものがあり、中でも絶縁油
として用いられるものは不乾性油か半乾性油で、
しかも電気特性が良好で、粘度が低く、流動点が
低い油となる。したがつて絶縁油として用いるこ
とができるいくつかの特性を第１表に示す。その
中にヒマシ油は流動点が最も低いが粘度が高い、
他は粘度が低いが流動点が−５〜−20℃ないしは
それ以上と高く、油入電気機器の低温特性に問題
がある欠点を有していた。
Industrial Application Field The present invention aims to improve the low-temperature properties of vegetable oil used in oil-filled electrical equipment such as capacitors and transformers, and to provide highly reliable oil-filled electrical equipment. Conventional technologies and their problems Conventionally, hydrocarbon insulating oils such as mineral oil, alkylbenzene, alkyl diphenylethane, and alkylnaphthalene have been used as electrical insulating oils, but while these are relatively thermally stable, Since the dielectric constant is low, it has been considered to use vegetable oil having a high dielectric constant. Vegetable oil has a higher dielectric constant of 3.1 to 4.5 than hydrocarbon insulating oil.
Furthermore, polypropylene film (hereinafter referred to as PP film) is widely used as an oil immersion material.
It has the characteristics that the swelling is small, and it also improves the impregnability between dielectric layers in oil-immersed capacitors and the like. There are various types of vegetable oils, among which those used as insulating oils are non-drying oils or semi-drying oils.
Furthermore, the oil has good electrical properties, low viscosity, and a low pour point. Table 1 therefore shows some properties that can be used as insulating oils. Among them, castor oil has the lowest pour point but high viscosity.
Others have a low viscosity but a high pour point of -5 to -20°C or higher, and have the disadvantage of having problems with low-temperature characteristics of oil-filled electrical equipment.
【表】
問題点を解決するための手段
植物油を用いた油入電気機器の低温特性を改善
するために、植物油の流動点を改善する必要があ
る。そこで、本発明は植物油にアルキルメタクリ
レート系ポリマーを混合して流動点を降下させる
ことが有効であることを、実験的に確認した。
すなわち、アルキルメタクリレート系ポリマー
とは一般式[Table] Measures to solve the problem In order to improve the low-temperature characteristics of oil-filled electrical equipment using vegetable oil, it is necessary to improve the pour point of vegetable oil. Therefore, in the present invention, it was experimentally confirmed that mixing an alkyl methacrylate polymer with vegetable oil to lower the pour point is effective. In other words, alkyl methacrylate polymer has the general formula
【式】Ｒはアルキル基
ｎは重合度で表される。ポリアルキルメタクリレ
ート（以下PMAという）は一般に石油系潤滑油
に添加される流動点降下剤の一種であるが、本発
明は電気絶縁油として用いる植物油に対しても有
効であることを究明し、油入電気機器の低温特性
が改善されることを見出したものである。さらに
アルキルメタクリレート系ポリマーの割合は0.01
〜5wt％が適当であることを確認した。
実施例
以下、本発明を実験データーによつて説明す
る。
植物油である菜種油に重量平均分子量70000の
PMA(A)および重量平均分子量100000のPMA(B)を
それぞれ添加して得た添加油の流動点を測定し
た。さらに綿実油および大豆油に重量平均分子量
70000のPMA(B)を添加して得たそれぞれの添加油
の流動点を測定した。流動点はJIS Ｃ 2101の試
験方法によつて求めた。
その結果を第２表に示す。
植物油にPMAを添加すると無添加油の流動点
より最高15℃低下する。添加量は0.01〜5wt％が
適し、添加量が多くなると、添加効果がなくなる
ことが判る。
次に流動点が降下した植物油を含浸した油入電
気機器の電気特性改善効果について確認した。
第１図は両面金属化紙よりなる電極と、PPフ
イルムよりなる誘導体を積層巻回して形成したコ
ンデンサ素子に菜種油を第２表に示すPMA(A)を
添加した添加油を含浸した静電容量30μFの油浸
コンデンサの−25℃におけるコロナ開始電圧を示
したものである。PMAの添加量が0.01〜5wt％で
コロナ開始電圧が菜種油単独よりも高く、流動点
降下の効果が現われている。[Formula] R is an alkyl group n is represented by the degree of polymerization. Polyalkyl methacrylate (hereinafter referred to as PMA) is a type of pour point depressant that is generally added to petroleum-based lubricating oils, but the present invention has found that it is also effective for vegetable oils used as electrical insulating oils. It was discovered that the low-temperature characteristics of electrical equipment can be improved. Furthermore, the proportion of alkyl methacrylate polymer is 0.01
It was confirmed that ~5wt% is appropriate. EXAMPLES The present invention will be explained below using experimental data. Rapeseed oil, a vegetable oil, has a weight average molecular weight of 70,000.
The pour points of the added oils obtained by adding PMA (A) and PMA (B) having a weight average molecular weight of 100,000 were measured. In addition, cottonseed oil and soybean oil have a weight average molecular weight
The pour point of each added oil obtained by adding 70,000 PMA (B) was measured. The pour point was determined by the JIS C 2101 test method. The results are shown in Table 2. Adding PMA to vegetable oil lowers the pour point by up to 15°C compared to the oil without additives. It can be seen that the addition amount is suitably 0.01 to 5 wt%, and as the addition amount increases, the addition effect disappears. Next, we confirmed the effect of improving the electrical characteristics of oil-filled electrical equipment impregnated with vegetable oil that has a lower pour point. Figure 1 shows the capacitance of an electrode made of double-sided metallized paper and a capacitor element formed by laminating and winding a dielectric made of PP film, impregnated with rapeseed oil and an additive oil containing PMA (A) shown in Table 2. This figure shows the corona onset voltage of a 30 μF oil-immersed capacitor at -25°C. When the amount of PMA added is 0.01 to 5 wt%, the corona onset voltage is higher than that of rapeseed oil alone, indicating the effect of lowering the pour point.
【表】
発明の効果
以上のように植物油にPMAを添加すると、植
物油の流動点が低下し、低温での流動性が確保で
き、油浸コンデンサの低温コロナ特性が改善され
るため、植物油を用いた油入電気機器の信頼性を
向上せしめる。
そしてPMAの添加量は植物油の低温性能の必
要に応じて適宜決めればよい。
PMAは粘稠なポリマーであり、ハンドリング
性を良くするために、一般には鉱油や、アルキル
ベンゼンで約50％希釈されているが、PMA添加
量としては同様に考えれば良い。
菜種油、大豆油、綿実油の実施例を示したが、
他の植物油でも同様の効果が得られる。また植物
油は食用油として使用され、一般には日本農林規
格（農林省告示第523号）で規格化されているも
のであり、衛生上極めて安全な物質であることは
いうまでもない。[Table] Effects of the invention As described above, adding PMA to vegetable oil lowers the pour point of the vegetable oil, ensures fluidity at low temperatures, and improves the low-temperature corona characteristics of oil-immersed capacitors. Improve the reliability of oil-filled electrical equipment. The amount of PMA added may be determined as appropriate depending on the need for low-temperature performance of the vegetable oil. PMA is a viscous polymer and is generally diluted by about 50% with mineral oil or alkylbenzene to improve handling, but the amount of PMA added can be considered in the same way. Examples of rapeseed oil, soybean oil, and cottonseed oil were shown;
Similar effects can be obtained with other vegetable oils. Furthermore, vegetable oil is used as an edible oil and is generally standardized under the Japanese Agricultural Standards (Ministry of Agriculture and Forestry Notification No. 523), so it goes without saying that it is an extremely safe substance from a sanitary standpoint.
第１図は菜種油へのポリアルキルメタクリレー
ト添加量〜コンデンサのコロナ開始電圧／定格電
圧比特性図である。
FIG. 1 is a characteristic diagram showing the amount of polyalkyl methacrylate added to rapeseed oil and the corona onset voltage/rated voltage ratio of the capacitor.
Claims (1)
を添加してなる電気絶縁油を使用したことを特徴
とする油入電気機器。 ２ アルキルメタクリレート系ポリマーを0.01〜
5wt％添加してなる特許請求の範囲第１項記載の
油入電気機器。[Scope of Claims] 1. An oil-filled electrical device characterized by using an electrical insulating oil made by adding an alkyl methacrylate polymer to vegetable oil. 2 Alkyl methacrylate polymer from 0.01 to
The oil-filled electrical equipment according to claim 1, in which 5 wt% is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10328885A JPS61260503A (en) | 1985-05-14 | 1985-05-14 | Oil-filled electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10328885A JPS61260503A (en) | 1985-05-14 | 1985-05-14 | Oil-filled electric equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61260503A JPS61260503A (en) | 1986-11-18 |
| JPH0562405B2 true JPH0562405B2 (en) | 1993-09-08 |
Family
ID=14350119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10328885A Granted JPS61260503A (en) | 1985-05-14 | 1985-05-14 | Oil-filled electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61260503A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6398986B1 (en) | 1995-12-21 | 2002-06-04 | Cooper Industries, Inc | Food grade vegetable oil based dielectric fluid and methods of using same |
| EP1304704B1 (en) * | 1995-12-21 | 2005-06-15 | Cooper Industries, Inc. | Vegetable oil based dielectric coolant |
| US6352655B1 (en) * | 1995-12-21 | 2002-03-05 | Cooper Industries, Inc. | Vegetable oil based dielectric fluid |
| US6037537A (en) * | 1995-12-21 | 2000-03-14 | Cooper Industries, Inc. | Vegetable oil based dielectric coolant |
| US5949017A (en) | 1996-06-18 | 1999-09-07 | Abb Power T&D Company Inc. | Electrical transformers containing electrical insulation fluids comprising high oleic acid oil compositions |
| US8187508B2 (en) | 2005-09-09 | 2012-05-29 | Lion Corporation | Base agent for electrical insulating oil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035407A (en) * | 1983-08-05 | 1985-02-23 | ニチコン株式会社 | Electrically insulating oil |
-
1985
- 1985-05-14 JP JP10328885A patent/JPS61260503A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035407A (en) * | 1983-08-05 | 1985-02-23 | ニチコン株式会社 | Electrically insulating oil |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61260503A (en) | 1986-11-18 |
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