JP4994846B2 - 自然循環冷却方式の変圧器用電気絶縁油 - Google Patents
自然循環冷却方式の変圧器用電気絶縁油 Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims description 15
- 238000010292 electrical insulation Methods 0.000 title claims description 6
- 150000002148 esters Chemical class 0.000 claims description 37
- 239000010735 electrical insulating oil Substances 0.000 claims description 30
- 239000003921 oil Substances 0.000 claims description 23
- 150000001735 carboxylic acids Chemical class 0.000 claims description 18
- -1 amine compounds Chemical class 0.000 claims description 13
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 claims description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims description 10
- 239000003112 inhibitor Substances 0.000 claims description 10
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 claims description 9
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 claims description 8
- MNWFXJYAOYHMED-UHFFFAOYSA-N heptanoic acid Chemical compound CCCCCCC(O)=O MNWFXJYAOYHMED-UHFFFAOYSA-N 0.000 claims description 8
- 230000007062 hydrolysis Effects 0.000 claims description 8
- 238000006460 hydrolysis reaction Methods 0.000 claims description 8
- FBUKVWPVBMHYJY-UHFFFAOYSA-N nonanoic acid Chemical compound CCCCCCCCC(O)=O FBUKVWPVBMHYJY-UHFFFAOYSA-N 0.000 claims description 8
- OBETXYAYXDNJHR-SSDOTTSWSA-M (2r)-2-ethylhexanoate Chemical compound CCCC[C@@H](CC)C([O-])=O OBETXYAYXDNJHR-SSDOTTSWSA-M 0.000 claims description 7
- OBETXYAYXDNJHR-UHFFFAOYSA-N alpha-ethylcaproic acid Natural products CCCCC(CC)C(O)=O OBETXYAYXDNJHR-UHFFFAOYSA-N 0.000 claims description 7
- 239000002216 antistatic agent Substances 0.000 claims description 7
- OILUAKBAMVLXGF-UHFFFAOYSA-N 3,5,5-trimethyl-hexanoic acid Chemical compound OC(=O)CC(C)CC(C)(C)C OILUAKBAMVLXGF-UHFFFAOYSA-N 0.000 claims description 5
- 150000001718 carbodiimides Chemical class 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 150000002989 phenols Chemical class 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 235000019198 oils Nutrition 0.000 description 21
- 238000000034 method Methods 0.000 description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 239000002199 base oil Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 3
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 3
- FQYUMYWMJTYZTK-UHFFFAOYSA-N Phenyl glycidyl ether Chemical compound C1OC1COC1=CC=CC=C1 FQYUMYWMJTYZTK-UHFFFAOYSA-N 0.000 description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 3
- 239000012964 benzotriazole Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- 235000019484 Rapeseed oil Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- WCQUXQDPAFJFHB-UHFFFAOYSA-N n,n'-bis(2-butylphenyl)methanediimine Chemical compound CCCCC1=CC=CC=C1N=C=NC1=CC=CC=C1CCCC WCQUXQDPAFJFHB-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
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- MDWVSAYEQPLWMX-UHFFFAOYSA-N 4,4'-Methylenebis(2,6-di-tert-butylphenol) Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 MDWVSAYEQPLWMX-UHFFFAOYSA-N 0.000 description 1
- KCSOBOZCMQBPFM-UHFFFAOYSA-N 4-n,4-n-dinaphthalen-2-ylbenzene-1,4-diamine Chemical compound C1=CC(N)=CC=C1N(C=1C=C2C=CC=CC2=CC=1)C1=CC=C(C=CC=C2)C2=C1 KCSOBOZCMQBPFM-UHFFFAOYSA-N 0.000 description 1
- UUNBFTCKFYBASS-UHFFFAOYSA-N C(CCCCCCC)C=1C(=C(C=CC1)NC1=CC=CC=C1)CCCCCCCC Chemical compound C(CCCCCCC)C=1C(=C(C=CC1)NC1=CC=CC=C1)CCCCCCCC UUNBFTCKFYBASS-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 101000823778 Homo sapiens Y-box-binding protein 2 Proteins 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000005037 alkyl phenyl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 125000003354 benzotriazolyl group Chemical class N1N=NC2=C1C=CC=C2* 0.000 description 1
- GONOPSZTUGRENK-UHFFFAOYSA-N benzyl(trichloro)silane Chemical compound Cl[Si](Cl)(Cl)CC1=CC=CC=C1 GONOPSZTUGRENK-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010696 ester oil Substances 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229940035429 isobutyl alcohol Drugs 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- POOVXLCLGSARNP-UHFFFAOYSA-N n,n'-bis(2-propan-2-ylphenyl)methanediimine Chemical compound CC(C)C1=CC=CC=C1N=C=NC1=CC=CC=C1C(C)C POOVXLCLGSARNP-UHFFFAOYSA-N 0.000 description 1
- ONWRHZSCWAZSHZ-UHFFFAOYSA-N n,n'-bis[2,3,4-tri(propan-2-yl)phenyl]methanediimine Chemical compound CC(C)C1=C(C(C)C)C(C(C)C)=CC=C1N=C=NC1=CC=C(C(C)C)C(C(C)C)=C1C(C)C ONWRHZSCWAZSHZ-UHFFFAOYSA-N 0.000 description 1
- GPZRJTOZLDJPBA-UHFFFAOYSA-N n,n'-bis[2,3-di(propan-2-yl)phenyl]methanediimine Chemical compound CC(C)C1=CC=CC(N=C=NC=2C(=C(C(C)C)C=CC=2)C(C)C)=C1C(C)C GPZRJTOZLDJPBA-UHFFFAOYSA-N 0.000 description 1
- CMESPBFFDMPSIY-UHFFFAOYSA-N n,n'-diphenylmethanediimine Chemical compound C1=CC=CC=C1N=C=NC1=CC=CC=C1 CMESPBFFDMPSIY-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N n-hexanoic acid Natural products CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920013636 polyphenyl ether polymer Polymers 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Lubricants (AREA)
Description
(1)ネオペンチルグリコールと炭素数7〜10の直鎖又は分岐カルボン酸の1種以上とからなるエステルを50質量%以上含有し、0℃での動粘度が10〜200mm2/s、絶縁破壊電圧が30kV以上、生分解性が60%以上、流動点が−30℃以下である自然循環冷却方式の変圧器用電気絶縁油、
(2)前記エステルが、ネオペンチルグリコールと、n-へプタン酸、n-オクタン酸、n-ノナン酸、n-デカン酸、2-エチルヘキサン酸及び3,5,5-トリメチルへキサン酸の少なくとも1種とのエステルを含有することを特徴とする上記(1)に記載の自然循環冷却方式の変圧器用電気絶縁油、
(3)前記エステルが、ネオペンチルグリコールと炭素数8又は9の分岐カルボン酸とのエステルの1種以上を5モル%以上含有することを特徴とする上記(1)に記載の自然循環冷却方式の変圧器用電気絶縁油、
(4)前記エステルが、ネオペンチルグリコールと2-エチルへキサン酸とのエステルを5〜100モル%含有することを特徴とする上記(3)に記載の自然循環冷却方式の変圧器用電気絶縁油、
(5)酸化防止剤としてのフェノール系化合物及び/又はアミン系化合物、帯電防止剤としてのトリアゾール化合物、並びに加水分解抑制剤としてのカルボジイミド及び/又はエポキシ化合物のいずれか1種以上がそれぞれ1質量%以下添加されていることを特徴とする上記(1)に記載の自然循環冷却方式の変圧器用電気絶縁油、
にかかるものである。
以下、実施例に基づいて、本発明をさらに詳細に説明する。なお、本発明は、以下の実施例によって何ら制限されるものではない。
アルコールとしてネオペンチルグリコール(NPG)を用い、カルボン酸としてn-へプタン酸(nC7)、n-オクタン酸(nC8)、n-ノナン酸(nC9)、n-デカン酸(nC10)、2-エチルへキサン酸(bC8)、3,5,5-トリメチルヘキサン酸(bC9)、n-ブタン酸(nC4)、n-ドデカン酸(nC12)を用い、又、比較のため、アルコールとしてトリメチロールプロパン(TMP)又はペンタエリスリトール(PE)を用い、表1に示したような割合でエステルを調製して、供試油とした。なお、カルボン酸を2種以上用いたエステルは化学混合、すなわち、カルボン酸を所定比で混合して、アルコールとエステル化反応させて調製したものである。
(1)動粘度:JIS K 2283に規定された方法により、0℃で測定した。
(2)生分解性:OECD 301Bに規定された方法(28日後)で測定した。
(3)流動点:JIS K 2269に規定された方法で測定した。
(4)全酸価:JIS K 2514に規定された方法で測定した。
(5)絶縁破壊電圧:JIS C 2101に規定された方法で測定した。
(6)誘電正接:JIS C 2101に規定された方法により80℃で測定した。
(7)引火点:JIS K 2265に規定された方法(クリーブランド開放式)で測定した。
上記供試油6に、酸化防止剤として、2,6-ジ-t-ブチル-p-クレゾール(DBPC)又はフェニル-α-ナフチルアミン(PNA)、帯電防止剤として、ベンゾトリアゾール(BTA)、加水分解抑制剤として、ビス(ブチルフェニル)カルボジイミド(BBPC)又はフェニルグリシジルエーテル(PGE)を全供試油質量基準で表3に示した量、それぞれ添加した。
Claims (5)
- ネオペンチルグリコールと炭素数7〜10の直鎖又は分岐カルボン酸の1種以上とからなるエステルを50質量%以上含有し、0℃における動粘度が10〜200mm2/s、絶縁破壊電圧が30kV以上、生分解性が60%以上、流動点が−30℃以下である自然循環冷却方式の変圧器用電気絶縁油。
- 前記エステルが、ネオペンチルグリコールと、n-へプタン酸、n-オクタン酸、n-ノナン酸、n-デカン酸、2-エチルヘキサン酸及び3,5,5-トリメチルへキサン酸の少なくとも1種とのエステルを含有することを特徴とする請求項1に記載の自然循環冷却方式の変圧器用電気絶縁油。
- 前記エステルが、ネオペンチルグリコールと炭素数8又は9の分岐カルボン酸とのエステルの1種以上を5モル%以上含有することを特徴とする請求項1に記載の自然循環冷却方式の変圧器用電気絶縁油。
- 前記エステルが、ネオペンチルグリコールと2-エチルへキサン酸とのエステルを5〜100モル%含有することを特徴とする請求項3に記載の自然循環冷却方式の変圧器用電気絶縁油。
- 酸化防止剤としてのフェノール系化合物及び/又はアミン系化合物、帯電防止剤としてのトリアゾール化合物、並びに加水分解抑制剤としてのカルボジイミド及び/又はエポキシ化合物のいずれか1種以上がそれぞれ1質量%以下添加されていることを特徴とする請求項1に記載の自然循環冷却方式の変圧器用電気絶縁油。
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PCT/JP2005/016312 WO2006040888A1 (ja) | 2004-10-13 | 2005-09-06 | 電気絶縁油 |
JP2006540849A JP4994846B2 (ja) | 2004-10-13 | 2005-09-06 | 自然循環冷却方式の変圧器用電気絶縁油 |
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JPWO2006040888A1 JPWO2006040888A1 (ja) | 2008-05-15 |
JP4994846B2 true JP4994846B2 (ja) | 2012-08-08 |
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KR (1) | KR101230701B1 (ja) |
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WO (1) | WO2006040888A1 (ja) |
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JP5165307B2 (ja) * | 2007-08-23 | 2013-03-21 | Jx日鉱日石エネルギー株式会社 | 電気絶縁油及びその製造方法 |
JP5613395B2 (ja) * | 2009-09-18 | 2014-10-22 | Jx日鉱日石エネルギー株式会社 | 電動モータ油組成物 |
EP2920794A1 (en) * | 2012-11-13 | 2015-09-23 | E. I. du Pont de Nemours and Company | Blended oil compositions useful as dielectric fluid compositions and methods of preparing same |
GB201402571D0 (en) * | 2014-02-13 | 2014-04-02 | M & I Materials Ltd | Improvements in and relating to dielectric fluids |
JP6614128B2 (ja) * | 2014-02-20 | 2019-12-04 | Agc株式会社 | 熱サイクルシステム用組成物および熱サイクルシステム |
GB201502874D0 (en) * | 2015-02-20 | 2015-04-08 | M & I Materials Ltd | Low temperature dielectric fluid compositions |
JP6430319B2 (ja) * | 2015-04-15 | 2018-11-28 | 株式会社日立製作所 | 電気絶縁紙およびそれを用いた静止誘導電器 |
GB2541929B (en) * | 2015-09-04 | 2018-05-09 | M&I Mat Limited | Ester compositions for dielectric fluids |
CN105296051B (zh) * | 2015-10-20 | 2018-08-24 | 中国石油化工股份有限公司 | 一种可生物降解绝缘油及其制备方法 |
CN107903985A (zh) * | 2017-10-23 | 2018-04-13 | 中国科学院长春应用化学研究所 | 一种合成酯类牵引变压器油组合物及其制备方法 |
CN116478754B (zh) * | 2022-01-13 | 2024-07-12 | 中国石油天然气股份有限公司 | 一种具有高水解稳定性的酯型变压器油组合物 |
CN115449418B (zh) * | 2022-09-29 | 2023-12-01 | 国网湖南省电力有限公司 | 一种防火绝缘油 |
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JP2003119482A (ja) * | 2001-10-10 | 2003-04-23 | New Japan Chem Co Ltd | 潤滑油 |
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JP2522307B2 (ja) * | 1987-06-12 | 1996-08-07 | 日本油脂株式会社 | 電気絶縁油 |
KR100293318B1 (ko) * | 1998-08-27 | 2001-10-26 | 이종훈 | 전기절연유의전산값간이측정용시약의제조방법및측정용기구와이를이용한전산값측정방법 |
JP2003073681A (ja) * | 2001-09-03 | 2003-03-12 | Hitachi Ltd | 冷蔵庫用作動媒体組成物又は該組成物を用いた冷蔵庫 |
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JPH04183788A (ja) * | 1990-11-16 | 1992-06-30 | Hitachi Ltd | 冷凍装置 |
JP2003119482A (ja) * | 2001-10-10 | 2003-04-23 | New Japan Chem Co Ltd | 潤滑油 |
JP2005276714A (ja) * | 2004-03-26 | 2005-10-06 | Japan Energy Corp | 電気絶縁油 |
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