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
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/08—Cooling; Ventilating
  • H01F27/10—Liquid cooling
  • H01F27/12—Oil cooling
  • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K7/00—Constructional details common to different types of electric apparatus
  • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
  • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures

Definitions

• the present invention provides a dielectric fluid suitable for use in electrical equipment.
• the dielectric fluid comprises an oil component comprising one or both of crambe oil and high erucic acid rapeseed (HEAR) oil and one or both of esterified or transesterified (which terms are used interchangeably herein) crambe oil and HEAR oil.
• HEAR high erucic acid rapeseed
• Some embodiments of the present inventions have oil components with a erucic acid content of at least 45 wt%, at least 50 wt%, at least 55 wt%, or at least 60 wt%.
• Removal of polar contaminants including pigments (e.g., chlorophylls), wax, and phospholipids such as lecithin may be conducted in which phosphoric or citric acid, phospholipid enzymes, silicates, such as metal or sodium silicates, or clays are added to the oil.
• phosphoric or citric acid e.g., phospholipid enzymes
• silicates such as metal or sodium silicates
• clays phospholipids
• a suitable amount of such materials is typically about 3-4 wt%.
• These materials typically agglomerate the contaminants into particles.
• the particles can them be removed by filtration.
• a suitable filtration medium typically removes particles in the range of 0.5 to 5 micrometers. Finer pore sized media are typically preferred.
• the crambe and HEAR oils may also undergo an esterification process.
• the esterification or transesterification reaction preferably results in an alkyl ester having a carbon chain of 1 to 8 carbons, more preferably 1 to 4 carbon atoms.
• Known esterification methods include the use of base or acid catalysts.
• the base catalyst comprise sodium hydroxide, potassium hydroxide, sodium alkoxides, potassium alkoxides, alkali metal alkoxylate catalysts selected from the group consisting of sodium methanolate, sodium ethanolate, sodium propanolate, sodium butanolate, potassium methanolate, potassium ethanolate, potassium propanolate, potassium butanolate and mixtures thereof, triethanolamine, and mixtures thereof.
• Typical examples of the acid catalyst comprise inorganic acid catalysts selected from the group consisting of sulfuric acid, phosphoric acid, hydrochloric acid, or mixtures thereof.
• the performance of dielectric fluids at low temperatures is important in some applications.
• the crambe and HEAR oils may have pour point values higher than are desirable for some applications.
• a typical electrical power distribution application requires that a coolant have a pour point below about -20 0 C.
• the dielectric fluids of the invention preferably are introduced into the electrical equipment in a manner that minimizes the exposure of the fluid to atmospheric oxygen, moisture, and other contaminants that could adversely affect their performance.
• a suitable process includes drying of the tank contents, evacuation and substitution of air with dry nitrogen gas, filling under partial vacuum, and immediate sealing of the tank.

Landscapes

• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Power Engineering (AREA)
• Organic Insulating Materials (AREA)
• Thermal Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Lubricants (AREA)

Priority Applications (9)

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Publications (1)

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Citations (2)

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• 2010
  • 2010-07-02 CN CN201080030720.2A patent/CN102473477B/zh active Active
  • 2010-07-02 US US13/382,416 patent/US8790553B2/en active Active
  • 2010-07-02 CA CA2767694A patent/CA2767694C/en not_active Expired - Fee Related
  • 2010-07-02 MX MX2012000411A patent/MX2012000411A/es not_active Application Discontinuation
  • 2010-07-02 WO PCT/US2010/040881 patent/WO2011005675A1/en not_active Ceased
  • 2010-07-02 JP JP2012519615A patent/JP5608229B2/ja not_active Expired - Fee Related
  • 2010-07-02 BR BR112012000482A patent/BR112012000482A2/pt not_active Application Discontinuation
  • 2010-07-02 SG SG2012001012A patent/SG177539A1/en unknown
  • 2010-07-02 RU RU2012102081/07A patent/RU2516470C2/ru not_active IP Right Cessation
  • 2010-07-02 KR KR1020127002917A patent/KR20120050990A/ko not_active Ceased
  • 2010-07-02 EP EP10730336.4A patent/EP2452344B1/en active Active
  • 2010-07-06 TW TW99122209A patent/TW201110152A/zh unknown

Patent Citations (2)

Non-Patent Citations (2)

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