Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
  • C10M111/02—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a non-macromolecular organic compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
  • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
• • 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
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/106—Naphthenic fractions
  • C10M2203/1065—Naphthenic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/108—Residual fractions, e.g. bright stocks
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/108—Residual fractions, e.g. bright stocks
  • C10M2203/1085—Residual fractions, e.g. bright stocks used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/17—Fisher Tropsch reaction products
  • C10M2205/173—Fisher Tropsch reaction products used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/02—Hydroxy compounds
  • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
  • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/28—Esters
  • C10M2207/287—Partial esters
  • C10M2207/289—Partial esters containing free hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/14—Electric or magnetic purposes
  • C10N2040/16—Dielectric; Insulating oil or insulators

Definitions

• the present invention relates to an electrical insulating oil composition.
• Transformers, high-pressure circuit breakers and other high-pressure electrical devices are filled with electrical insulating oil compositions before use. However, it must be possible for such electrical devices to be used maintenance-free for long periods after the start of operation. Similarly, such compositions are required to maintain stable physical properties and electrical properties over a long period.
• the IEC International Electrotechnical Commission
• the IEC International Electrotechnical Commission
• the hydrorefining method has been widely adopted, making it possible to obtain oils from which polycyclic aromatics, unsaturated components, nitrogen content and sulphur content have been adequately removed.
• JP 2000-345177 A discloses that with regard to oxidation stability and other aspects it was preferable for electrical insulating oil compositions to contain a certain amount of these components.
• JP 2000-345177 A proposes that by reducing the resin content in an electrical insulating oil composition to ⁇ 100 ppm, and also incorporating minute amounts of sulphide-type sulphur content and total nitrogen content, the stability of the electrical insulating oil composition is increased, and increases in electric charge are inhibited.
• the present invention provides an electrical insulting oil composition having a flash point (PMCC) of 130° C. or more and a pour point of ⁇ 40° C. or lower, which composition comprises hydrorefined mineral oil and/or synthetic hydrocarbon oil and in the range of from 0.5 to 10 wt. % of bright stock oil, based on the total weight of the electrical insulating oil composition.
• PMCC flash point
• a pour point ⁇ 40° C. or lower
• the electrical insulating oil composition has a pour point of ⁇ 45° C. or lower.
• the electrical insulating oil composition has a flash point (PMCC) of 135° C. or more.
• hydrorefined mineral oil that may be present in the electrical insulating oil composition of the present invention may be refined by hydrogenating mineral oil.
• hydrorefined mineral oils that may be conveniently used include hydrorefined naphthenic mineral oil and hydrorefined paraffinic mineral oil.
• hydrorefining of mineral oils polycyclic aromatic substances, unsaturated components, sulphur compounds and nitrogen compounds are preferably removed.
• the hydrorefined naphthenic mineral oils may have better low temperature flow properties and lower oxidation stability, and, conversely, compared to the hydrorefined naphthenic mineral oils, the hydrorefined paraffinic mineral oils may have inferior low temperature flow properties, but better thermal oxidation stability.
• Examples of synthetic hydrocarbon oils that may be conveniently used in the electrical insulating oil composition of the present invention include polypropylene, polybutene, polypentene and other isoparaffinic synthetic hydrocarbon oils, poly- ⁇ -olefins (PAO) falling within Group IV in the API (American Petroleum Institute) base oil classification stated below in Table 1, and Gas to Liquid (GTL) synthetic oils.
• Synthetic hydrocarbon base oils sold by the Shell group under the trade designation “XHVI” may be conveniently used.
• Japanese Laid-Open Patent Application 52-072706 A and Japanese Laid-Open Patent Application 07-228876 describe methods of manufacturing synthetic hydrocarbon oils that may be conveniently used in the electrical insulating oil composition of the present invention.
• hydrorefined mineral oils and synthetic hydrocarbon oils may be used alone.
• the pour point, kinematic viscosity, thermal oxidation stability and the like of the electrical insulating oil composition of the present invention may be optimally adjusted by appropriate combination of several substances.
• the hydrorefined mineral oil and/or synthetic hydrocarbon oil used in the electrical insulating oil composition of the present invention each have a preferred kinematic viscosity at 40° C. in the range of from 8.0 to 24 mm 2 /s.
• Preferred hydrorefined mineral oils may be selected from hydrorefined naphthenic mineral oils and/or API base oil classification Group II or Group III hydrorefined paraffinic mineral oils.
• Preferred synthetic hydrocarbon oils may be selected from isoparaffinic synthetic oils, GTL synthetic oils and poly- ⁇ -olefins (PAO) belonging to API base oil classification Group IV or mixtures thereof.
• PAO poly- ⁇ -olefins
• the intrinsic kinematic viscosity of the hydrorefined mineral oil and/or synthetic hydrocarbon oil at 40° C. is 16 mm 2 /s or less, more preferably 12 mm 2 /s or less if hydrorefined mineral oil or synthetic hydrocarbon oil is used alone with bright stock oil.
• the respective kinematic viscosity of the hydrorefined mineral oil and the synthetic hydrocarbon oil is each preferably in the range of from 8.0 to 24.0 mm 2 /s, more preferably in the range of from 8.0 to 20.0 mm 2 /s.
• the bright stock oil added to the afore-mentioned hydrorefined mineral oil and/or synthetic hydrocarbon oil may be obtained by further distilling under reduced pressure the atmospheric pressure residual mineral oil obtained when paraffinic mineral oil is distilled at atmospheric pressure from crude oil, and performing deasphalting, solvent extraction and solvent dewaxing processes on that reduced pressure residual oil.
• said bright stock oil may be a heavy mineral oil base oil fraction obtained by reduced pressure distillation of the residual paraffinic mineral oil from atmospheric distillation of crude oil, and deasphalting, solvent extraction and solvent dewaxing treatment of the residual oil obtained.
• the bright stock oil used in the present invention is preferably a base oil belonging to API base oil classification Group I, with total sulphur content in the range of from 0.4 to 2.0 wt. %, mercaptan sulphur content of 100 wt. ppm or less, sulphide-type sulphur content of 0.5 wt. % or less, total nitrogen content in the range of from 100 to 500 wt. ppm, basic nitrogen content of 300 wt. ppm or less, and total content of polar components (IP368) in the range of from 30 to 70 wt. %.
• IP368 total content of polar components
• Various sulphur compounds and nitrogen compounds are concentrated in said bright stock oil by the distillation and solvent extraction processes.
• the afore-mentioned sulphur content and nitrogen content are incorporated in appropriate quantities in the electrical insulating oil composition.
• the electrical insulating oil composition of the present invention has a preferred kinematic viscosity at 40° C. in the range of from 8.0 to 16.0 mm 2 /s, more preferably in the range of from 8.0 to 12.0 mm 2 /s. With a kinematic viscosity at 40° C. of less than 8.0 mm 2 /s, a satisfactory flash point may not be obtained. If the kinematic viscosity at 40° C. exceeds 16.0 mm 2 /s, then the circulation efficiency of the electrical insulating oil composition in a transformer may decrease, the cooling effect may become inadequate, and overheating may occur.
• the electrical insulating oil composition of the present invention may comprise one or more antioxidant additives.
• Antioxidants that may be conveniently used are phenolic or aminic antioxidants.
• phenolic antioxidants that may be conveniently used in the electrical insulating oil composition of the present invention include 4,4′-methylenebis(2,6-di-tert.-butylphenol), 4,4′-bis(2,6-di-tert.-butylphenol), 4,4′-bis(2-methyl-6-tert.-butylphenol), 2,2′-methylenebis(4-ethyl-6-tert.-butylphenol), 2,2′-methylenebis(4-methyl-6-tert.-butylphenol), 4,4′-butylidenebis(3-methyl-6-tert.-butylphenol), 4,4′-isopropylidenebis(2,6-di-tert.-butyl-phenol), 2,2′-methylenebis(4-methyl-6-nonylphenol), 2,2′-is
• the content of the one or more antioxidant additives is preferably less than 2 wt. %, more preferably less than 1 wt. %, even more preferably less than 0.6 wt. % and most preferably less than 0.4 wt. %, based on the total weight of the electrical insulating oil composition.
• the electrical insulating oil composition comprises in the range of from 0.01 to 0.4 wt. % of phenolic antioxidant, based on the total weight of the electrical insulating oil composition. In other embodiments of the present invention, it is preferred that the electrical insulating oil composition comprises in the range of from 0.01 to 0.08 wt. % or in the range of from 0.08 to 0.4 wt. % of phenolic antioxidant, based on the total weight of the electrical insulating oil composition.
• the present invention provides an electrical insulating oil composition having a flash point (PMCC) of 130° C. or more and a pour point of ⁇ 40° C. or lower, more preferably of ⁇ 45° C. or lower, which composition comprises hydrorefined mineral oil and/or synthetic hydrocarbon oil and in the range of from 0.5 to 10 wt. % of bright stock oil, and which composition conforms with IEC (International Electrotechnical Commission) Standard 296, Class II, in that after 168 hrs at 100° C. in IEC oxidation stability test method 61125A, sludge formation is 0.1% or less, and the acid value is 0.4 mg KOH/g or less.
• PMCC flash point
• IEC International Electrotechnical Commission
• the present invention further provides an electrical insulating oil composition having a flash point (PMCC) of 130° C. or more, more preferably of 135° C. or more and a pour point of ⁇ 40° C. or lower, more preferably of ⁇ 45° C. or lower, which composition comprises hydrorefined mineral oil and/or synthetic hydrocarbon oil and in the range of from 0.5 to 10 wt. % of bright stock oil, and which composition conforms with IEC Standard 60296, Type U, in that after 164 hrs at 120° C. in IEC oxidation stability test method 61125C, sludge formation is 0.8 wt. % or less, and the acid value is 1.2 mg KOH/g or less.
• PMCC flash point
• the present invention further provides an electrical insulating oil composition having a flash point (PMCC) of 130° C. or more, more preferably of 135° C. or more and a pour point of ⁇ 40° C. or lower, more preferably of ⁇ 45° C. or lower, which composition comprises hydrorefined mineral oil and/or synthetic hydrocarbon oil, in the range of from 0.5 to 10 wt. % of bright stock oil and in the range of from 0.01 to 0.4 wt. %, more preferably in the range of from 0.08 to 0.4 wt. % of an antioxidant, preferably a phenolic antioxidant and which composition conforms with IEC Standard 60296, Type I, in that after 500 hrs at 120° C. in IEC oxidation stability test method 61125C, sludge formation is 0.8 wt. % or less, and the acid value is 1.2 mg KOH/g or less.
• PMCC flash point
• the present invention further provides an electrical insulating oil composition having a flash point (PMCC) of 130° C. or more, more preferably of 135° C. or more and a pour point of ⁇ 40° C. or lower, more preferably of ⁇ 45° C. or lower, which composition comprises hydrorefined mineral oil and/or synthetic hydrocarbon oil, in the range of from 0.5 to 10 wt. % of bright stock oil and in the range of from 0.01 to 0.4 wt. %, more preferably in the range of from 0.01 to 0.08 wt. % of an antioxidant, preferably a phenolic antioxidant and which composition conforms with IEC Standard 60296, Type T, in that after 332 hrs at 120° C. in IEC oxidation stability test method 61125C, sludge formation is 0.8 wt. % or less, and the acid value is 1.2 mg KOH/g or less.
• PMCC flash point
• the present invention provides an electrical insulating oil composition which conforms to one or more of the following standards:—IEC (International Electrotechnical Commission) Standard 296 (Class II), IEC Standard 60296 (Type U), IEC Standard 60296 (Type I) and IEC Standard 60296 (Type T).
• IEC International Electrotechnical Commission
• the present invention further provides for the use of an electrical insulating oil composition as hereinbefore described in order to conform with one or more of IEC (International Electrotechnical Commission) Standard 296 (Class II), IEC Standard 60296 (Type U), IEC Standard 60296 (Type I) and IEC Standard 60296 (Type T).
• IEC International Electrotechnical Commission
• the present invention further provides the use of the composition as hereinbefore described as an electrical insulting oil for application in one or more of transformers, regulators, circuit breakers, power plant reactors, shunt reactors, switch gears, cables and electrical equipment.
• hydrorefined mineral oils mineral oils and synthetic hydrocarbon oils
• the base oils A-J and bright stock oil having the properties shown in Table 2, Table 3 and Table 4 were prepared.
• PCA PCA content: as per BS2000P-346.
• Base oil A hydrorefined naphthenic base oil (mineral oil)
• B isoparaffinic base oil (synthetic oil)
• C isoparaffinic base oil (synthetic oil)
• D solvent-refined paraffin base oil (mineral oil)
• Examples 1-7 which were electrical insulating oil compositions according to the present invention and not containing antioxidants, were prepared in accordance with the compositions shown in Table 5 and Table 6.
• Examples 8-11 which are electrical insulating oil compositions according to the present invention and containing antioxidants, were prepared in accordance with the compositions shown in Table 7.
• Comparative Examples C1-C15 were prepared in accordance with the compositions shown in Tables 8-10.
• Example # Composition 6 7 Base oil A (wt. %) 70.8 71.6 Base oil I (wt. %) 25.5 — Base oil J (wt. %) — 24.5 Bright stock oil (wt. %) 3.7 3.9 Clay treatment * 1% 1% * wt. % relative to amount of oil components used.
• Example # Composition 8 9 10 11 Base oil A (wt. %) 80 80 80 80 80 80 80 80 Base oil B (wt. %) 16 — 16 — Base oil C (wt. %) — 16 — 16 Bright stock oil (wt. %) 3.9 3.9 3.95 3.95 Antioxidant “BHT” (wt. %) 0.1 0.1 0.05 0.05 Clay treatment * 1% 1% 1% 1% Note: The antioxidant “BHT” is 2,6-di-tert-butyl-4-methylphenol. “BHT” added to oil components after clay treatment. * wt. % relative to amount of oil components used.
• IEC standard values were used as the standard reference values for the performance of the electrical insulating oil compositions. If these standard reference values were satisfied, then it was considered that long-term stable use over a wide temperature range was possible.
• Examples 10 and 11 had lower antioxidant contents than Examples 8 and 9, and the values of their electrical insulating oil properties were measured, and those results are shown in Table 15 together with the standard values for IEC Standard 60296, Type T.
• the values relating to oxidation stability were substantially lower than the IEC Standard 296, Class II, standard reference values (maximum values) or the IEC Standard 60296, Type U standard reference values (maximum values), and said compositions were judged to be excellent as electrical insulating oil compositions.
• compositions of Comparative Examples 10-14 satisfied the standard reference values as regards acid value, said compositions did not satisfy the standard reference values as regards sludge, and it was judged that said comparative compositions could not be used as suitable electrical insulating oil compositions.
• TABLE 11 IEC Standard 296* Ex. 1 Ex. 2 Antioxidant not not not detected detected detected Kin. Viscosity 40° C. ⁇ 11.0 10.06 10.73 (mm 2 /s) ⁇ 30° C. ⁇ 1800 1571 1389 Flash point ° C. ⁇ 130 136 138 (PMCC) Pour point ° C.

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• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Lubricants (AREA)
• Organic Insulating Materials (AREA)

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• 2006
  • 2006-02-16 JP JP2006039407A patent/JP5102452B2/ja active Active
• 2007
  • 2007-02-15 CN CNA2007800056679A patent/CN101385095A/zh active Pending
  • 2007-02-15 AT AT07704608T patent/ATE533166T1/de active
  • 2007-02-15 WO PCT/EP2007/051484 patent/WO2007093631A1/en active Application Filing
  • 2007-02-15 BR BRPI0708062-0A patent/BRPI0708062A2/pt not_active IP Right Cessation
  • 2007-02-15 ES ES07704608T patent/ES2373577T3/es active Active
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