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
  • 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
• • 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
  • C10M2203/104—Aromatic fractions
• • 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
  • 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
  • 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
  • C10N2030/02—Pour-point; 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
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • 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
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/40—Low content or no content compositions
• • 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
  • C10N2030/40—Low content or no content compositions
  • C10N2030/43—Sulfur free or low sulfur content compositions
• • 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
• • 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
• • 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
  • C10N2040/17—Electric or magnetic purposes for electric contacts

Definitions

• the present invention relates to an electrical oil composition.
• electrical equipment contain an electrical oil composition for dissipating the heat generated by energised components, for insulating the energised components from the equipment enclosure and from other internal parts and devices, and combinations thereof.
• electrical equipment include, but are not limited to, transformers, capacitors, switches, regulators, circuit breakers, cables, reclosers, rectifiers, reactors, x-ray equipment, and combinations thereof .
• a transformer generally transfers electric power from one circuit to another electromagnetically .
• Transformers are generally used in the transmission of electrical power.
• Good oxidation stability may expressed by low acid formation and/or low sludge formation and low temperature viscosity values.
• WO-A-01/54138 describes an electrical oil composition which is said to have improved oxidation and electrical resistance.
• Said electrical oil composition comprises a blend of (A) a substantially nitrogen and sulphur free, paraffinic or naphthenic base oil boiling in the electrical oil boiling range, and (B) a hydrofined light gas oil (LGO) boiling in the range of about 200 °C to about 400 0 C and having a sulphur to basic nitrogen ratio (S/BN) greater than 100:1, the hydrofined LGO being present in an amount sufficient to provide a blend having greater than about 0.03 wt % sulphur .
• DAE distillate aromatic extracts
• Distillate aromatic extracts have very high aromatic contents, typically at least 70 wt . % .
• aromatic it is meant a molecule composed primarily of carbon and hydrogen which comprises at least one ring which composed of conjugated unsaturated carbon bonds, such as compounds containing a benzene moiety, polynuclear aromatics or polyaromatic compounds, i.e. compounds comprising more than one aromatic ring fused together, such as anthracene based moieties, are also included in this definition of aromatic.
• Such molecules may comprise sulphur as a heteroatom.
• Distillate aromatic extracts are obtained as a byproduct of the process of solvent extraction of vacuum distillates used as a raw material for the manufacture of lubricant base oils.
• Such distillate aromatic extracts generally contain high concentrations of polynuclear aromatics, typically from 10 to 25 wt.%, as measured by IP 346 method.
• PNA polynuclear aromatics
• PCA polycyclic aromatics
• PAH polyaromatic hydrocarbons
• Distillate aromatic extracts are classified as “carcinogenic” according to the European legislation (EU Substance Directive 67/548/EEC) and must be labelled with the risk phrase “R45” (may cause cancer) and the label “T” (toxic, skull and crossbones) in Europe.
• EU Substance Directive 67/548/EEC European legislation
• T toxic, skull and crossbones
• electrical oil compositions comprising 0.1 wt.% or more of distillate aromatic extracts must also be labelled with the risk phrase "R45” (may cause cancer) and the label “T” (toxic, skull and crossbones) in Europe due to the levels of polynuclear aromatics, and in particular polyaromatic hydrocarbons therein.
• the present Application provides an electrical oil composition
• an electrical oil composition comprising (A) de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene, benzo [b] fluoranthene, benzo [j ] fluoranthene, benzo [k] fluoranthene, benzo [e] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg; and (B) one or more base oils each having a viscosity of not more than 4.0 mm 2 /s at 100 °C.
• DACO de-asphalted cylinder oil
• the de-asphalted cylinder oil (DACO) may be prepared by de-asphalting a mineral-derived vacuum residue to obtain a de-asphalted oil (DAO) , solvent-extracting the de-asphalted oil and obtaining the de-asphalted cylinder oil (DACO) extract.
• the de-asphalted oil (DAO) used is defined as the product of a de-asphalting process step wherein asphalt is removed from a reduced crude petroleum feed or from the residue, bottom fraction, of a vacuum distillation of a crude petroleum feed (hereinafter referred to as "mineral-derived vacuum residues").
• the de-asphalting process utilises a light hydrocarbon liquid solvent, for example propane, for asphalt compounds.
• the de-asphalted oil undergoes solvent extraction, wherein residual aromatic extract known as de-asphalted cylinder oil (DACO) is removed therefrom.
• solvent extraction process that may be conveniently used include furfural or NMP solvent extraction processes or other solvent extraction processes, for example, as described in Chapter 5 of "Lubricant base oil and wax processing” , Avilino Sequeira, Jr., Marcel Dekker, Inc, New York, 1994, ISBN 0-8247-9256-4.
• the benzo [a] pyrene content and 8 PAH content may be measured in the de-asphalted cylinder oil by GC/MS analysis.
• this technique is commercially available at Biochemisches Institut f ⁇ r
• the amount of polyaromatic hydrocarbons subsequently present in the de-asphalted cylinder oil may be controlled during isolation of the mineral- derived vacuum residue by appropriate selection of the cut width of the highest boiling distillate fraction.
• the de-asphalted cylinder oil preferably has a sulphur content in the range of from 0.5 to 5 wt . %, more preferably in the range of from 3 to 4.5 wt . %, as measured by ISO 14596, based on the total weight of the de-asphalted cylinder oil.
• the kinematic viscosity at 100 0 C of the de- asphalted cylinder oil is preferably less than 100 mm 2 /s, more preferably in the range of from 35 to 90 mm 2 /s.
• Kinematic viscosity at 100 0 C as mentioned herein may be conveniently measured in accordance with ISO 3104.
• the flash point of the de-asphalted cylinder oil is preferably above 250 0 C, more preferably above 280 0 C and most preferably above 290 0 C, as measured by the Cleveland Open Cap (COC) method, ISO 2592.
• COC Cleveland Open Cap
• the de-asphalted cylinder oil (A) is preferably present in the electrical oil composition of the present invention in an amount in the range of from 0.05 to 5 wt. %, more preferably in an amount in the range of from 0.1 to 2 wt . % and most preferably in the range of from 0.1 to 0.8 wt. %, based on the total weight of the electrical oil composition.
• the one or more base oils (B) are base oils having a kinematic viscosity at 100 0 C of not more than 3.5 mm 2 /s, more preferably in the range of from 0.8 to 3 mm 2 /s.
• the one or more base oils (B) in the present invention preferably have a sulphur content of less than 2 wt. %, more preferably less than 0.5 wt. % and most preferably less than 0.1 wt . %, as measured by ISO 14596, based on the total weight of the one or more base oils (B) .
• the one or more base oils (B) as hereinbefore described may be conveniently prepared by vacuum distillation, followed by solvent extraction, hydrofining, hydrogenation and hydrocracking. Paraffinic oils may be de-waxed or hydroisomerised to improve the pour point.
• Said one or more base oils (B) may also be conveniently prepared by Fischer-Tropsch synthesis.
• said one or more base oils (B) are selected from one or more mineral-derived paraffinic oils, one or more mineral-derived naphthenic oils, one or more Fischer- Tropsch derived base oils and mixtures thereof.
• paraffinic base oils (B) that may be used include Group I, Group II and Group III base oils.
• Group I base oils base oils, “Group II” base oils and “Group III” , in the present invention are meant base oils according to the definitions of American Petroleum Institute (API) categories I and II. Such API categories are defined in API Publication 1509, 15th Edition, Appendix E, April 2002.
• API American Petroleum Institute
• Group I base oils contain less than 90 % saturates (according to ASTM D2007) and/or greater than 0.03 % sulphur (according to ASTM D2622, D4294, D4927 or D3120) and have a viscosity index of greater than or equal to 80 and less than 120 (according to ASTM D2270) .
• Group II base oils contain greater than or equal to 90 % saturates and less than or equal to 0.03 % sulphur and have a viscosity index of greater than or equal to 80 and less than 120, according to the aforementioned ASTM methods .
• Group III base oils contain greater than or equal to 90 % saturates and less than or equal to 0.03 % sulphur and have a viscosity index of greater than 120, according to the afore-mentioned ASTM methods.
• Naphthenic base oils are defined as Group V base oils according to API.
• the base oil composition may thus comprise a mineral-derived base oil of the so-called paraffinic type or naphthenic type.
• Such base oils are obtained by refinery processes starting from paraffinic and naphthenic crude feeds.
• Mineral-derived paraffin base oils are defined by a viscosity index of greater than 70, preferably greater than 90. Said base oils are produced from feedstocks rich in paraffins.
• Mineral-derived naphthenic base oils for the purpose of the present invention are defined as having a pour point of below -20 0 C and a viscosity index of below 70.
• Such base oils are produced from feedstocks rich in naphthenes and low in wax content and are used mainly for lubricants in which colour and colour stability are important, and VI and oxidation stability are of secondary importance .
• Fischer-Tropsch derived base oils may be conveniently used as the base oil in the lubricating oil _ g _
• composition of the present invention for example, the Fischer-Tropsch derived base oils disclosed in EP-A-776959, EP-A-668342, WO-A-97/21788 , WO-A-00/15736 , WO-A-00/14188, WO-A-00/14187 , WO-A-00/14183 , WO-A-00/14179, WO-A-00/08115 , WO-A-99/41332 ,
• EP-A-1029029, WO-A-01/18156 and WO-A-01/57166 are examples of EP-A-1029029, WO-A-01/18156 and WO-A-01/57166.
• the one or more base oils (B) are preferably present in the electrical oil composition of the present invention in a total amount of at least 80 wt. %, more preferably in a total amount in the range of from 90 to 99.95 wt. %, based on the total weight of the electrical oil composition.
• base oils and other synthetic base oil components may be present in the electrical oil formulation, including base oils having a kinematic viscosity at 100 0 C which is greater than the kinematic viscosity at 100 0 C of each of the one or more base oils (B) .
• Such base oils may include, but are not limited to, esters, poly alpha olefins, as preferably obtained by oligomerisation of an olefinic compound and poly alkylene glycols .
• the electrical oil composition of the present invention preferably has a sulphur content of below 0.3 wt . % and even more preferably below 0.15 wt. %, as measured by ISO 14596, with respect to the total weight of the electrical oil composition.
• the electrical oil composition is a non-corrosive electrical oil, as measured according to the CIGRE A2.32.01 Covered Conduct Deposition test (corrosive sulphur) and/or according to ASTM D 1275 B test. That is to say, in a preferred embodiment of the present invention, the electrical oil composition passes the CIGRE A2.32.01 Covered Conduct Deposition test for corrosive sulphur and/or the ASTM D 1275 B test for corrosive sulphur.
• the electrical oil composition of the present invention preferably has a kinematic viscosity at 100 0 C of less than 5 mm ⁇ /sec, more preferably less than 4 mm 2 /sec, most preferably less than 3 mm 2 /sec.
• the flash point of the electrical oil composition as measured by ASTM D92 may be greater than 120 0 C, preferably greater than 135 0 C.
• the higher flash points are desirable for applications where peak temperatures can exceed the average oil temperature, for instance in applications under high temperature and/or with restricted heat transmission potential . Examples are electric transformers and electric engines.
• the electrical oil composition of the present invention may comprise one or more additives.
• the electrical oil composition of the present invention may comprise one or more metal passivators, in particular one or more copper passivators.
• Metal passivators or electrostatic discharge depressants sometimes also referred as metal deactivators, that may be conveniently used include N-salicylideneethylamine, N, N' -di salicylideneethyldiamine, triethylenediamine, ethylenediamminetetraacetic acid, phosphoric acid, citric acid and gluconic acid. More preferred compounds are lecithin, thiadiazole, imidazole and pyrazole and derivatives thereof. Even more preferred compounds are benzotriazoles and their derivatives.
• R 4 may be hydrogen or a group represented by the formula (III)
• c is 0, 1, 2 or 3 ;
• R 1 and R ⁇ are hydrogen or the same or different straight or branched alkyl groups of 1-18 carbon atoms, preferably a branched alkyl group of 1-12 carbon atoms;
• R ⁇ is a straight or branched C ] __4 alkyl group, preferably R ⁇ is methyl or ethyl and C is 1 or 2; R ⁇ is a methylene or ethylene group,- R ⁇ and R ⁇ are the same or different alkyl groups of 3-15 carbon atoms, preferably of 4-9 carbon atoms.
• Preferred compounds are 1- [bis (2-ethylhexyl) - aminomethyl] benzotriazole, methylbenzotriazole, dimethylbenzotriazole , ethylbenzotriazole , ethylmethylbenzotriazole, diethylbenzotriazole and mixtures thereof .
• Other preferred compounds include (N-Bis (2-ethylhexyl) -aminomethyl-tolutriazole, non- substituted benzotriazole, and 5-methyl-lH- benzotriazole .
• copper passivator additives as described above are described in US-A-5912212 , EP-A- 1054052 and in US-A-2002/0109127.
• benzotriazole compounds are preferred because they also act as an electrostatic discharge depressant, which is beneficial when an oil formulation is used as an electrical oil.
• Metal passivator additives such as those described above are commercially available under the trade designations "BTA”, “TTA”, “IRGAMET 39", “IRGAMET 30” and “IRGAMET 38S” from CIBA Ltd Basel Switzerland, also traded under the trade name "Reomet” by CIBA.
• the content of the above metal passivator in the electrical oil composition of the present invention is preferably above 1 mg/kg and more preferably above 5 mg/kg.
• a practical upper limit may vary depending on the specific application of the electrical oil composition. For example, when desiring improved dielectric discharge tendencies of the oil, it may be desired to add a high concentration of the metal passivator additive. This concentration may be up to 3 wt . %, preferably however in the range of from 0.001 to 1 wt. %. However, such compounds may be advantageously used at concentrations below 1000 mg/kg and more preferably below 300 mg/kg.
• the electrical oil composition of the present invention may comprise one or more anti-oxidant additives .
• Anti—oxidants that may be conveniently used are so-called hindered phenolic or amine anti-oxidants, for example naphthols, sterically hindered monohydric, dihydric and trihydric phenols, sterically hindered dinuclear, trinuclear and polynuclear phenols, alkylated or styrenated diphenylamines or ionol derived hindered phenols.
• Sterically hindered phenolic anti-oxidants of particular interest may be selected from the group consisting of 2, 6-di-tert-butylphenol (available under the trade designation "IRGANOX TM L 140" from CIBA) , di tert-butylated hydroxytoluene (“BHT”), methylene-
• CIBA tetrakis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) - propionyloxymethyl) methane (available under the trade designation "IRGANOX TM 1010" from CIBA) , thiodiethylene bis (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate (available under the trade designation "IRGANOX TM 1035” from CIBA), octadecyl 3 , 5-di-tert-butyl-4- hydroxyhydrocinnamate (available under the trade designation "IRGANOX TM 1076” from CIBA) and 2,5-di- tert-butylhydroquinone .
• anti-oxidants are di-tert- butylated hydroxytoluene ("BHT") and 3 , 5-di-tert-butyl- 4-hydroxy-hydrocinnamic acid-C7 ⁇ C9-alkyl ester.
• BHT di-tert- butylated hydroxytoluene
• 3 5-di-tert-butyl- 4-hydroxy-hydrocinnamic acid-C7 ⁇ C9-alkyl ester.
• amine anti-oxidants examples include aromatic amine anti-oxidants for example N, N' -Di-isopropyl-p-phenylenediamine, N, N 1 -di-sec-butyl-p-phenylenediamine, N, N 1 -bis (1,4- dimethyl-pentyl) -p-phenylenediamine, N, N 1 -bis (l-ethyl-3- methyl-pentyl) -p-phenylene-diamine, N, N 1 -bis (1-methyl- heptyl) -p-phenylenediamine, N, N 1 -dicyclohexyl-p- phenylene-diamine, N, N' -diphenyl-p-phenylenediamine, N, N 1 -di (naphthyl-2- ) -p-phenylenediamine, N-isopropyl-N 1 - phenylenediamine
• the content of the one or more anti-oxidant additives is preferably less than 2 wt . % and more preferably less than 1 wt . %, even more preferably less than 0.6 wt . % and most preferably less than 0.3 wt. %, with respect to the total weight of the electrical oil composition.
• the detergent may conveniently be an over-based metallic detergent, for example the phosphonate, sulfonate, phenolate or salicylate types as described in the above referred to General Textbook.
• Preferred pour point depressants are hydrocarbon or oxygenated hydrocarbon type pour point depressants.
• an electrical oil composition comprising (A) de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene, benzo [b] fluoranthene, benzo [j ] fluoranthene, benzo [k] fluoranthene, benzo [e] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg,- and (B) one or more base oils each having a viscosity of not more than 4,0 mm 2 /s at 100 0 C, wherein said composition does not contain any anti-oxidant additives.
• DACO de-asphalted cylinder oil
• an electrical oil composition comprising (A) de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene, benzo [b] fluoranthene , benzo [j ] fluoranthene , benzo [k] fluoranthene, benzo [e] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg; and (B) one or more base oils each having a viscosity of not more than 4.0 mm 2 /s at 100 0 C, wherein said composition does not contain any additives.
• DACO de-asphalted cylinder oil
• the electrical oil composition of the present invention may find particular application in switch gears, transformers, regulators, circuit breakers, power plant reactors, shunt reactors, cables and other electrical equipment.
• Preferred aromatic compounds are for example tertrahydronaphthalene , diethylbenzene, di-isopropylbenzene, a mixture of alkylbenzenes as commercially obtainable as "Shell Oil 4697" or "Shellsol A 150" both "Shell” products obtainable from Shell Kunststoff GmbH.
• a preferred electrical oil composition of the present invention comprises a mixture of 2 , 6-di-t-butyl phenol and 2 , 6-di-t-butyl cresol .
• the oil formulation comprises between 0.1 and 3 wt% of 2, 6-di-t- butyl phenol and 0.1 to 2 wt% of 2 , 6-di-t-butyl cresol in a weight ratio of between 1:1 and 1:1.5.
• the electrical oil composition according to the present invention is preferably subjected to a clay treatment .
• Clay treatment is a well known treatment to remove polar compounds from electrical oil compositions. It is performed in order to further improve the colour, chemical and thermal stability of such compositions. It may be performed prior to adding the additives hereinbefore described on a partly formulated electrical oil composition.
• Clay treatment processes are for example described in Lubricant base oil and wax processing, Avilino Sequeira, Jr., Marcel Dekker, Inc, New York, 1994, ISBN 0-8247-9256-4, pages 229-232.
• additive components such as copper passivators and anti-oxidants are added after the clay treatment.
• the electrical oil composition of the present invention may find use in applications which have to start up regularly, especially more than 10 times per year at a temperature of below 0 0 C, more preferably below -5 0 C, wherein the temperature of the oil when the application is running is above 0 0 C.
• Examples of such applications are as low temperature switch gear oils, transformers, regulators, circuit breakers, power plant reactors, switch gear, cables, electrical equipment.
• Such applications are well known to the skilled person and described for example in Lubricants and related products, Dieter Klamann, Verlag Chemie GmbH, Weinhem, 1984, pages 330-339.
• the electrical oil composition as herein before described may be conveniently prepared by admixing (A) de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene, benzo [b] fluoranthene, benzo [j] fluoranthene, benzo [k] fluoranthene, benzo [e] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg with (B) one or more base oils each having a viscosity of not more than 4.0 mm 2 /s at 100 0 C, and, optionally, one or more additives as herein before described.
• A de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anth
• electrical oil compositions comprising (A) de-asphalted cylinder oil (DACO) having a benzo [a] pyrene content of not more than 1 mg/kg and a total content of benz [a] anthracene, chrysene , benzo [b] fluoranthene , benzo [j ] fluoranthene , benzo [k] fluoranthene, benzo [e] pyrene, benzo [a] pyrene and dibenz [a, h] anthracene of not more than 10 mg/kg; and (B) one or more base oils each having a viscosity of not more than 4.0 mm 2 /s at 100 0 C have been surprisingly found to have good oxidation stability, but also to avoid the need for R45 labelling.
• DACO de-asphalted cylinder oil
• Table 1 indicates the formulations that were tested and the experimental results thereon.
• Table 2 indicates the properties of the base oils in Table 1.
• NmI not measured as sludge produced was very high.
• Oxidation stability was assessed by the so-called Baader ageing test according to DIN 51554 and the IEC 61125 C Oxidation test 164H/120°C.
• Comparative Example 1 represents a naphthenic base oil. Both the neutralisation number and saponification number after the Baader test are extremely high and indicate a severe oxidative degradation of said oil resulting in acids and ester structures. The total acidity in the IEC 61125C test is also unacceptably high.
• Comparative Example 2 represents a typical electrical oil formulation comprising naphthenic base oil and distillate aromatic extract. Whilst said formulation has excellent ageing properties, in accordance with EU Substance Directive 67/548/EEC, it requires labelling with R 45 and "T" (skull and cross bones) due to the use of DAE (which is carcinogenic) as blend component .
• Comparative Example 3 is a blend of a high sulphur and a low sulphur containing naphthenic base oil. Said formulation has a higher neutralisation number and a higher saponification number than Comparative Example 2 which represents the industry reference for a high quality un- inhibited electrical oil.
• Example 1 represents an electrical oil composition according to the present invention, which composition comprise a blend of naphthenic base oil with DACO to match the sulphur content of Comparative Example 2. Not only are the neutralisation number and the saponification numbers for Example 1 good, but in addition, said composition also avoids the need for labelling according to EU Substance Directive 67/548/EEC.
• Example 2 represents another electrical oil composition according to the present invention, which composition comprise a blend of naphthenic base oil with DACO.
• said composition also avoids the need for labelling according to EU Substance Directive 67/548/EEC.
• Example 3 represents an electrical oil composition according to the present invention, which composition comprises a blend of two naphthenic oils with DACO. This formulation shows an improved neutralisation value and saponification value when compared to Comparative Example 3. Furthermore, said composition also avoids the need for labelling according to EU Substance Directive 67/548/EEC.
• Example 4 represents an electrical oil composition according to the present invention, which composition comprises a blend of two naphthenic oils with DACO and also contains a metal passivator. When compared with Comparative Example 2, it is apparent that this formulation has a lower total acidity in the IEC 61125 C oxidation test.
• Example 5 represents an electrical oil composition according to the present invention, which composition comprises a blend of a Fisher-Tropsch derived base oil with DACO.
• the electrical oil compositions of Examples 1-5 not only avoid the need for labelling according to EU Substance Directive 67/548/EEC, but also have good oxidation stability.

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