WO2002099820A1 - Composition d'huile electriquement isolante - Google Patents

Composition d'huile electriquement isolante Download PDF

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Publication number
WO2002099820A1
WO2002099820A1 PCT/JP2002/005290 JP0205290W WO02099820A1 WO 2002099820 A1 WO2002099820 A1 WO 2002099820A1 JP 0205290 W JP0205290 W JP 0205290W WO 02099820 A1 WO02099820 A1 WO 02099820A1
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WO
WIPO (PCT)
Prior art keywords
nitrogen
oil
insulating oil
breakdown voltage
atom
Prior art date
Application number
PCT/JP2002/005290
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English (en)
Japanese (ja)
Inventor
Takashi Sano
Original Assignee
Nippon Oil Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Oil Corporation filed Critical Nippon Oil Corporation
Publication of WO2002099820A1 publication Critical patent/WO2002099820A1/fr

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Classifications

    • 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
    • H01B3/22—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 hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
    • C07D209/04—Indoles; Hydrogenated indoles
    • 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

Definitions

  • the present invention relates to an electrical insulating oil composition, and more particularly, to an electrical insulating oil composition having a high impact breakdown voltage.
  • high-voltage equipment such as transformers, high-voltage cables, high-voltage circuit breakers, and capacitors have been installed in power plants, factories, and large-scale facilities. Since these high-voltage devices are often installed outdoors, lightning strikes are required.
  • One way to improve the resistance of high-voltage equipment to lightning strikes is to improve the performance of electrical insulating oil used for filling high-voltage equipment.
  • the impact breakdown voltage that is desirable as an electrical insulating oil is set to 14.5 kV or more, but the conventionally used electrical insulating oil has an impact breakdown voltage of 15 kV. In many cases, it is less than 0 kV, which is not always sufficient as the electrical insulating oil for the high-voltage equipment described above.
  • the impact breakdown voltage can be generally improved by selecting a specific base oil or performing a sufficient refining treatment.
  • Synthetic base oils such as alkyl benzene and polyolefin Relatively expensive base oils such as oil and highly refined mineral oil such as hydrocracked mineral oil are often used.
  • simply improving the properties of the base oil itself may not be enough in some cases, and it is very difficult to obtain a sufficient impact breakdown voltage when a cheaper low-refined mineral oil is used. It was hot.
  • the present invention has been made in view of the above-mentioned problems of the related art, and has a sufficiently high impact breakdown voltage, and has a sufficient resistance to lightning strike when used for charging high voltage equipment installed outdoors. It is intended to provide an electric insulating oil composition that can be obtained.
  • the present inventors have conducted intensive studies to achieve the above object, and as a result, when a mineral oil and Z or a synthetic oil are used as base oils and a nitrogen-containing heterocyclic compound having a specific structure is added to the base oil, The inventors have found that the above-mentioned problems can be solved, and have completed the present invention. That is, the electric insulating oil composition of the present invention contains at least one base oil selected from the group consisting of mineral oils and synthetic oils, and one or two nitrogen atoms as heterocyclic constituent atoms. And a nitrogen-containing heterocyclic compound whose bond to the atom is a single bond.
  • the electric insulating oil composition of the present invention by blending the above base oil and the nitrogen-containing heterocyclic compound, the impact breakdown voltage inherently exhibited by the base oil and the addition of the nitrogen-containing heterocyclic compound.
  • the synergistic effect with the effect of improving the impact breakdown voltage achieves a sufficiently high level of impact breakdown voltage. Therefore, when the electrical insulating oil composition of the present invention is used for filling high-voltage equipment installed outdoors, it is possible to obtain sufficient resistance to lightning strikes.
  • the content of the nitrogen-containing heterocyclic compound is preferably 5 to 550 mass ppm based on the total amount of the composition.
  • excellent electric insulation properties such as a small dielectric loss tangent and a high volume resistivity can be achieved in addition to a higher impact breakdown voltage. Tend to be.
  • the electric insulating oil composition of the present invention contains at least one of mineral oil and synthetic oil as a base oil.
  • the power base oil is not particularly limited, and may be an electric insulating oil or other lubricating oil.
  • Known mineral base oils, synthetic base oils, and the like can be used as the oil base oil.
  • a lubricating oil fraction obtained by subjecting crude oil to atmospheric distillation and vacuum distillation is subjected to solvent removal, solvent extraction, hydrogenation decomposition, solvent Paraffinic mineral oil and naphthenic mineral oil refined by appropriately combining refining treatments such as dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, and clay treatment.
  • the synthetic base oil used in the present invention include poly ⁇ olefin, (polybutene, 1-octene oligomer, 1-decene oligomer, etc.), polybutene, anolequinolebenzene, and anole Synthetic hydrocarbon oils such as quinolenaphthalene, alkinoresifeninoleanolecan (anolequinolesinphenylenoleethane, annalequinolepheninolexylinoleethane, benzinole toluene, etc.) and alkyl biphenyls; diesters (ditris) Decyl glutarate, di-2-ethylhexyl adipate, disodecyl adipate, ditridecyl adipate, di-2-ethylhexyl separate, etc., polyol esters (trimethylolpropane caprylate, trimethylolpropane belargon
  • one of the above base oils may be used alone, or two or more may be used in combination at an arbitrary mixing ratio.
  • the viscosity of the base oil according to the present invention is arbitrary, it is preferable that kinematic viscosity at 4 0 ° C is 1 ⁇ 5 0 mm 2 Z S , is 3 ⁇ 4 0 mm 2 / s More preferably, it is still more preferably SSO mm 2 ⁇ .
  • base oils highly refined mineral oils such as hydrocracked mineral oils and hydrocarbon synthetic oils themselves exhibit relatively high impact breakdown voltages. And the addition of the nitrogen-containing heterocyclic compound described below. It is preferable because an electric insulating oil composition exhibiting a higher impact breakdown voltage can be obtained by a synergistic effect with the effect of improving the impact breakdown voltage by the application.
  • low-purity mineral oils such as solvent-refined mineral oils exhibit relatively low impact breakdown voltages themselves, but the effect of adding nitrogen-containing complex cyclic compounds described later has a greater effect of improving the impact breakdown voltage.
  • Use of the base oil is preferred because an electrical insulating oil composition exhibiting a higher impact breakdown voltage can be obtained.
  • These base oils should be selected appropriately in accordance with various required properties such as dielectric loss tangent, volume resistivity, oxidation stability and hydrogen gas absorption required for the equipment used in addition to the impact breakdown voltage. Can be.
  • a nitrogen-containing heterocyclic compound in which the above base oil contains 1 to 2 nitrogen atoms as a heterocyclic constituent atom, and the bond between the nitrogen atom and any other atom is a single bond. Is blended.
  • the bond between the nitrogen atom that is a heterocyclic ring constituent atom and another atom is a single bond, and the double bond is present in the heterocyclic ring.
  • the nitrogen atom does not participate in the double bond. If a compound in which a nitrogen atom as a heterocyclic ring atom is bonded to another atom by a double bond is blended with the base oil, a sufficient effect of improving the impact breakdown voltage cannot be obtained. Oxidation stability becomes insufficient.
  • Such a nitrogen-containing heterocyclic ring may be composed of a carbon atom and a nitrogen atom, and is composed of a carbon atom, a nitrogen atom, and other atoms such as an oxygen atom and a sulfur atom. It may be something.
  • the use of a nitrogen-containing heterocyclic compound having a heterocyclic ring composed of a carbon atom and a nitrogen atom is preferable because the impact breakdown voltage is further increased and excellent oxidation stability tends to be obtained. .
  • the heterocyclic ring includes one or two nitrogen atoms as a heterocyclic member.
  • the heterocyclic ring does not contain a nitrogen atom as a ring-constituting atom, or when it contains three or more nitrogen atoms as a heterocyclic-constituting atom, the effect of improving the impact breakdown voltage becomes insufficient.
  • the number of nitrogen atoms referred to herein is a nitrogen-containing heterocyclic compound. Refers to the total number of all nitrogen atoms contained in the heterocyclic ring possessed by the product, and when the nitrogen-containing heterocyclic compound has a plurality of monocyclic heterocyclic rings or polycyclic heterocyclic rings, it is included in those heterocyclic rings. Refers to the total number of nitrogen atoms.
  • the heterocyclic ring of the nitrogen-containing heterocyclic compound according to the present invention may be a monocyclic or polycyclic ring as long as it contains 1 to 2 nitrogen atoms as a heterocyclic constituent atom.
  • the heterocyclic ring is a polycyclic ring, it may be either a condensed ring or a non-condensed ring, but when the heterocyclic ring is a condensed polycyclic ring composed of two to three rings, the impact breakdown voltage is improved. This is preferable because the effect tends to be further enhanced.
  • the heterocyclic ring may have aromaticity or may not have aromaticity.
  • heterocyclic ring examples include an indolidine ring, an isoindole ring, an indole ring, a 4H-quinolidine ring, a carbazole ring, an indoline ring, and an isoindolin ring.
  • a nitrogen-containing heterocyclic compound having a ring or a carbazole ring is preferred because the impact breakdown voltage can be further increased.
  • part or all of the hydrogen atoms bonded to the heterocyclic ring-constituting atoms may be substituted with a hydrocarbon group.
  • a hydrocarbon group include an anoalkyl group, an alkenyl group, a cycloalkynyl group, an alkynolecycloanolyl group, an acryl group, an alkylaryl group, and an arylalkyl group. Is also preferably an alkyl group.
  • the substituent is an alkyl group, the impact breakdown voltage is further increased, and excellent oxidation stability tends to be obtained.
  • the number of hydrocarbon groups in the heterocycle is not particularly limited, the number of hydrocarbon groups is preferably one or two in order to further increase the effect of improving the impact breakdown voltage. Further, the total number of carbon atoms of the hydrocarbon group is usually 1 to 20, preferably 1 to 16, and more preferably 1 to 10 from the viewpoint of the effect of improving the impact breakdown voltage. , 1 to 8, still more preferably 1 to 6, and particularly preferably 1 to 4.
  • Preferred examples of the nitrogen-containing heterocyclic compound according to the present invention include indolizine represented by the following formula (1), isoindole represented by the following formula (2), and indole represented by the following formula (3) 4H-quinolizine represented by the following formula (4), carbazole represented by the following formula (5), indoline represented by the following formula (6), isoindoline represented by the following formula (7), and And a compound in which a hydrogen atom bonded to a heterocyclic constituent atom of the compound of formula (1) is substituted with a hydrocarbon group.
  • the content of the nitrogen-containing heterocyclic compound according to the present invention is not particularly limited as long as the impact breakdown voltage of the electric insulating oil composition is not impaired, but is 5 mass ppm or more based on the total amount of the electric insulating oil composition. Is more preferable, it is more preferably at least 10 mass ppm, more preferably at least 30 mass ppm. When the content of the nitrogen-containing heterocyclic compound is less than the lower limit, the effect of improving the impact breakdown voltage tends to be insufficient. Further, the content of the nitrogen-containing heterocyclic compound is preferably 500 mass ppm or less, more preferably 400 mass ppm or less, based on the total amount of the electric insulating oil composition.
  • the electric insulating oil composition of the present invention contains the above base oil and the nitrogen-containing heterocyclic compound, but may contain a known additive for insulating oil.
  • additives include flowing antistatic agents such as benzotriazole; 2,6-di-t-butynoleic 4-methinolephenol (DB PC); 2,6-di-t-butynolephenol; Phenolic antioxidants; amine antioxidants such as phenylnaphthylamine; condensates of chlorinated paraffins with naphthalene; polymethacrylates; and olefin polymers (including ethylene-propylene copolymers and anoalkylated polystyrene). Pour point depressants and the like.
  • the content of these additives is not particularly limited as long as the impact breakdown voltage of the electric insulating oil composition is not impaired, but the total content is preferably 5% by mass or less based on the total amount of the electric insulating oil. It is more preferably at most 0.1% by mass, more preferably at most 0.1% by mass.
  • the kinematic viscosity of the electrical insulating oil composition of the present invention is not particularly limited, it preferably has a kinematic viscosity at 40 ° C is 1 to 50 mm 2 / s, more preferably 3 ⁇ 4 Omrr ⁇ Zs, More preferably, it is 5 to 30 mm 2 Zs.
  • the electric insulating oil contain a small amount of nitrogen (basic nitrogen and non-basic nitrogen).
  • the base oil oil that has been subjected to purification treatment such as hydrorefining, solvent extraction purification, solid adsorption purification, and sulfuric acid washing purification alone or in combination of two or more types is often used.
  • the electrical insulating oil composition of the present invention also preferably contains as little basic nitrogen as possible from the viewpoint of oxidation stability.
  • the basic nitrogen content of the electrical insulating oil composition is 3 ppm.
  • the term "basic nitrogen content” used herein refers to UOP Method 269-90 "NI TROGEN B Measure the nitrogen content [pm] measured by the method specified in ASESIN HYDROCARBONS BY POTENT IOMETR ICTI TRATION "(1990).
  • the nitrogen-containing heterocyclic compound contained in the electric insulating oil composition of the present invention corresponds to a non-basic nitrogen component, but the nitrogen-containing heterocyclic compound impairs the oxidation stability of the electric insulating oil composition. It is possible to improve the impact breakdown voltage without causing an increase in the nitrogen content due to the addition of the nitrogen-containing heterocyclic compound, and does not significantly affect the oxidation stability. However, in the present invention, not only the oxidation stability is improved, but also the dielectric tangent is reduced, and the volume resistivity is increased. Or less, more preferably 30 ppm or less, still more preferably 20 ppm or less, still more preferably 15 ppm or less, and particularly preferably 10 ppm or less. I like it.
  • the non-basic nitrogen content is the value obtained by subtracting the above basic nitrogen content from the nitrogen content measured by the method specified in JISK 2609 “Testing methods for nitrogen content in crude oil and petroleum products”. [p pm].
  • the electric insulating oil composition of the present invention having the above-described configuration, a high impact breakdown voltage, which was difficult to achieve with a conventional electric insulating oil, is realized. Therefore, the electric insulating oil composition of the present invention is suitable for use in filling high-voltage equipment such as transformers, high-voltage cables, high-voltage circuit breakers, and condensers that are installed outdoors in power plants, factories, and large-scale facilities. It is very useful in that it provides sufficient resistance to lightning strikes.
  • Example 1 to 4 and Comparative Examples 1 to 4 the following base oils and nitrogen-containing compounds were used. The samples were mixed to obtain the composition shown in Table 1 to prepare a sample oil. In Comparative Example 5, base oil 1 was used as a sample oil. Table 1 shows the kinematic viscosity, basic nitrogen content, and non-basic nitrogen content of the obtained sample oil at 40 ° C.
  • Base oil 1 mineral oil refined with paraffinic solvent (kinematic viscosity at 40 ° C: 6.3 mm V s)
  • Nitrogen-containing compound 1 Carbazole
  • Nitrogen-containing compound 2 N-methylcarbazole
  • Nitrogen-containing compound 4 benzotriazole.
  • Example 1 Oil 1 3 chambers 2 2 6.3 1 hectare 11 lbo U.Uo
  • naphthenic solvent refined mineral oil (kinematic viscosity at 40 ° C .: 8. OmmVs, hereinafter referred to as “base oil 2”) and nitrogen-containing compounds 1 and 2 were prepared so as to have the compositions shown in Table 2.
  • the sample oil was prepared by mixing.
  • base oil 2 was used as a sample oil.
  • Table 2 shows the kinematic viscosity, basic nitrogen content and non-basic nitrogen content of the obtained sample oil at 40 ° C.
  • Example fi oil 9 Table 3 ⁇ 41 Li mouthpiece ⁇ J 8.0 Less than 1 7 155 ⁇ J. ⁇ J ⁇ . ⁇
  • Example Base oil 2 Nitrogen-containing compound 8.0 Less than 1 13 160 0.03 0.06 6 (99.990) 1
  • Example Base oil 2 Nitrogen-containing compound 8.0 Less than 1 6 155 0.03 0.05 7 (99.995) 2
  • Example Base oil 2 Nitrogen-containing compound 8.0 Less than 1 12 160 0.03 0.06 8 (99.990) 2
  • Comparative example Base oil 2 8.0 Less than 1 Less than 3 135 0.03 0.05 6 (99.995)
  • Example 9 the mixture of base oil 1 and alkylbenzene (kinematic viscosity at 40 ° C .: 12.8 mmVs) (mass ratio: 50/50, kinematic viscosity at 40 ° C .: 7.Imm s)
  • the sample oil was prepared by mixing base oil 3 and nitrogen-containing compounds 1 and 2 so as to have the composition shown in Table 3.
  • base oil 3 was used as a sample oil.
  • Table 3 shows the kinematic viscosity, basic nitrogen content, and non-basic nitrogen content of the obtained sample oil at 40 ° C.
  • Example 1 oil 3 included ⁇ ⁇ ⁇ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
  • Example Base oil 3 Nitrogen-containing compound 7.1 Less than 1 10 180 0.01 0.03 10 (99.990) 1
  • Example Base oil 3 Nitrogen-containing compound 7.1 Less than 1 5 175 0.01 0.02 11 (99.995) 2
  • Example Base oil 3 Nitrogen-containing compound 7.1 Less than 1 11 185 0.01 0.03
  • the electric insulating oil composition of the present invention realizes a high impact breakdown voltage, which was difficult to achieve with the conventional electric insulating oil. Therefore, the electrical insulating oil composition of the present invention can be used for transformers, high-voltage cables, high-voltage circuit breakers,

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Lubricants (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne une composition d'huile électriquement isolante, caractérisée en ce qu'elle comprend au moins une huile de base sélectionnée dans le groupe comprenant une huile minérale et une huile synthétique, et un composé hétérocyclique à teneur en azote, ayant un ou deux atomes d'azote comme atome présent sur son noyau hétérocyclique, la liaison entre un tel atome d'azote et un autre atome étant une liaison simple.
PCT/JP2002/005290 2001-06-05 2002-05-30 Composition d'huile electriquement isolante WO2002099820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-169940 2001-06-05
JP2001169940A JP2002367431A (ja) 2001-06-05 2001-06-05 電気絶縁油組成物

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WO2002099820A1 true WO2002099820A1 (fr) 2002-12-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005111470A (ja) * 2003-09-18 2005-04-28 Tokyo Electric Power Co Inc:The 有機塩素化合物の除去方法
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443888A (en) * 1945-07-04 1948-06-22 Gen Electric Synthetic waxes and method of preparing the same
EP0091249A1 (fr) * 1982-03-25 1983-10-12 Nippon Mining Company Limited Huile isolante stabilisée contre l'oxydation et méthode pour sa préparation
JP2000164034A (ja) * 1998-11-30 2000-06-16 Nippon Mitsubishi Oil Corp 電気絶縁油

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443888A (en) * 1945-07-04 1948-06-22 Gen Electric Synthetic waxes and method of preparing the same
EP0091249A1 (fr) * 1982-03-25 1983-10-12 Nippon Mining Company Limited Huile isolante stabilisée contre l'oxydation et méthode pour sa préparation
JP2000164034A (ja) * 1998-11-30 2000-06-16 Nippon Mitsubishi Oil Corp 電気絶縁油

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