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EP3544032B1 - Transformateur avec isolation en gel composite - Google Patents

Transformateur avec isolation en gel composite Download PDF

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Publication number
EP3544032B1
EP3544032B1 EP18162517.9A EP18162517A EP3544032B1 EP 3544032 B1 EP3544032 B1 EP 3544032B1 EP 18162517 A EP18162517 A EP 18162517A EP 3544032 B1 EP3544032 B1 EP 3544032B1
Authority
EP
European Patent Office
Prior art keywords
gel
transformer
oil
primary winding
insulation
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP18162517.9A
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German (de)
English (en)
Other versions
EP3544032A1 (fr
Inventor
Adam Michalik
Bartlomiej Adamczyk
Wojciech Wysocki
Wojciech Piasecki
Jedrzej Banaszczyk
Dariusz Smugala
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Energy Ltd
Original Assignee
Hitachi Energy Switzerland AG
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Publication date
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Priority to EP18162517.9A priority Critical patent/EP3544032B1/fr
Publication of EP3544032A1 publication Critical patent/EP3544032A1/fr
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Publication of EP3544032B1 publication Critical patent/EP3544032B1/fr
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Classifications

    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • 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
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/442—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from aromatic vinyl compounds
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the present disclosure relates to a transformer with electrical insulation of a composite material.
  • US 2011/287226 A1 and DE 101 10 062 A1 disclose a transformer comprising a primary winding, a secondary winding and a shell housing the windings, wherein the windings are surrounded by an insulation medium within the shell.
  • the insulation medium comprises e.g. silicone gel and oil gel.
  • the insulation medium comprises e.g. sand disposed in liquid insulation oil.
  • EP 0 736 215 A1 discloses an electrical cable joint with a composite insulation comprising an inorganic particulate filler impregnated with an oil-based gel comprising a thickener (styrene butadiene rubber), the gel being in solid form, wherein the inorganic particulate filler comprises sand. It is mentioned that temperature will have an effect on the viscosity.
  • US 6 383 634 B1 discloses an high voltage electric cable with a composite insulation comprising an inorganic particulate filler impregnated with an oil-based gel comprising a thickener, the gel being in solid form.
  • the inorganic particulate filler comprises fine dielectric nano-particles. It is further mentioned that the composite insulation may be used as insulation system in a transformer.
  • US 6 391 447 B1 provides said same disclosure as US 6 383 634 B1 , except that water swelling powder is employed as the particulate filler.
  • US 8 134 089 B2 discloses a bushing for electric connection to an energy supply conductor such as a cable, said bushing comprising an insulation medium comprising a gel containing particles of a ceramic of higher thermal conductivity than the polymer of the gel itself, for example Boron Nitride particles.
  • a composite insulation as specified in present claim 1 a dry insulation is obtainable which can be easily provided in a similar way as a liquid insulation, by impregnating the filler with the gel in liquid form at a temperature which is above the transition temperature (gelling temperature) of the thermo-reversible gel. At the operating temperature of the electrical device, which is below the transition temperature of the gel, the insulation is essentially solid.
  • Advantages with using a gel instead of a liquid oil include reduced risk of leakage into the environment and reduced risk of splashing of hot or burning oil during an (unlikely) explosion due to e.g. transformer fault.
  • thermo-reversible gels are known for impregnating power cable insulation, where the gel can be made sufficiently soft and resilient to allow the cable to be flexible.
  • WO 97/04466 relates to a High-Voltage Direct Current (HVDC) power cable comprising an insulation of a plurality of permeable tapes wound around the conductor.
  • An impregnating compound fills all voids among the tape layers.
  • the impregnating compound has a very steep slope of change of viscosity characteristics, the viscosity being high with a solid gel type structure at temperatures equal to and below the maximum operating temperature of the cable and being low with a thin liquid type structure at higher temperatures at which impregnation takes place.
  • 95% of the impregnating compound consists of alkane chains with chain lengths above 15 carbon units but no more than 2% of the chains have chain lengths above 28 carbon units.
  • WO 99/33066 discloses a dielectric gelling composition, exhibiting a thermo-reversible liquid-gel transition at a transition temperature, wherein the gel comprises an oil and a gelator with a block copolymer.
  • the gelling composition is used as an impregnant in an insulated direct current (DC) cable having at least one conductor and an impregnated insulation system.
  • DC direct current
  • the insulation system comprises a solid electrically insulating dielectric part with a porous, fibrous and/or laminated structure impregnated with the dielectric gelling composition.
  • US 6,391,447 relates to a method for manufacture of an electric device having at least one conductor and a porous, fibrous and/or laminated electrically insulating dielectric system comprising a solid electrically insulating part impregnated with a dielectric fluid, wherein the method comprises impregnating with a dielectric fluid, wherein a gelling additive is added to impart a high viscosity and elasticity to the fluid at conditions for which the device is designed to operate under.
  • Figure 1a illustrates an electrical device 1, here in the form of an electrical power device, here a transformer, 4 immersed in a composite insulation 3 within a transformer tank 2, not forming part of the present invention.
  • the composite insulation 3 is as discussed herein, a composite between an oil-based thermo-reversible gel and an inorganic particulate filler, e.g. sand.
  • FIG. 1b illustrates an embodiment of a transformer 4, according to the present invention.
  • the transformer 4 comprises a primary winding 5 which is immersed in the composite insulation 3 of the present disclosure, enclosed by a shell 6, the shell separating the primary winding 5 from the secondary winding 7.
  • the primary winding 5 is wound around a transformer core 8, outside of the secondary winding 7 which is also wound around the core 8.
  • the composite insulation 3 is as discussed herein, a composite between an oil-based thermo-reversible gel and an inorganic particulate filler comprising sand.
  • the tansformer 4 may be an instrument transformer or a power transformer, or any other type of voltage transformer.
  • the operating voltage of the electrical device 1 may preferably be medium voltage (MV), up to 72 kV, but high voltage (HV) applications above 72 kV are possible as well.
  • the insulating gel 4 may act as a major insulation (between the high potential and ground) of the transformer.
  • the oil may be any electrically insulating oil, e.g. mineral oil, aromatic oil, ester oil and/or paraffinic oil, e.g. iso-paraffinic oil, or a mixture thereof.
  • the thickener may be a polymeric thickener e.g. SEPTON styrene thermoplastic elastomer containing block copolymers - e.g. SEPTON TM 1000-SERIES (SEP), SEPTON TM 4000-SERIES (SEEPS) from Kuraray.
  • a thickener comprising or consisting of SEEPS TM 4099 (a tri-block copolymer consisting of polystyrene-b-poly(ethylene-ethylene/propylene)-b-polystyrene) and/or SEP TM 1020 (a di-block copolymer consisting of polystyrene-b-poly(ethylene/propylene)) may be used.
  • SEEPS TM 4099 a tri-block copolymer consisting of polystyrene-b-poly(ethylene-ethylene/propylene)-b-polystyrene
  • SEP TM 1020 a di-block copolymer consisting of polystyrene-b-poly(ethylene/propylene)
  • the thickener may be present in an amount of at most 10 wt% of the gel (4), e.g. 1-5 wt%.
  • the gel 4 may, in addition to the oil and thickener, one or several additives, such as an anti-oxidant as mentioned above, or any other additive may be added, e.g. up to 1 wt% of the gel 4.
  • additives such as an anti-oxidant as mentioned above, or any other additive may be added, e.g. up to 1 wt% of the gel 4.
  • BN boron nitride
  • h-BN 2D hexagonal BN
  • Figure 2 illustrates the change in viscosity over a temperature range of an oil-based gel which may be used in the composite insulation 3.
  • the gel should have a high viscosity (be in its solid form) at operating temperatures of the electrical device 1 but should also have a relatively low viscosity (be in its liquid form) at a manufacturing temperature when the insulation 3 is formed by mixing/impregnating the particulate filler with the gel.
  • This makes the gel thermo-reversible, being in a solid form below at temperatures below a transition temperature and in a liquid form at temperatures above said transition temperature, forming a knee in the viscosity curve of figure 2 .
  • the gel has a complex viscosity above 10 Pa ⁇ s (is in its solid form) below about 50°C and a complex viscosity below 0.01 Pa ⁇ s (is in its liquid form) above about 90°C.
  • the transition temperature may be within the range of 30-200°C.
  • the preferred viscosity of the gel 4 at the operating temperature of the transformer, as well as the transition temperature and preferred viscosity of the gel when in liquid form (when the insulator (3) is repaired, may vary depending on the application.
  • the gel may have a viscosity in solid form, e.g. below 90°C, of at least 10 Pa ⁇ s, and a viscosity in liquid form, e.g. above 110°C, of at most 0.1 Pa ⁇ s, e.g. for an operating temperature of the electrical device of 80°C.
  • the gel of the composite insulation 3 is based on an insulating oil, e.g. mineral oil, ester oil and/or paraffinic oil, e.g. iso-paraffinic oil.
  • the gel is formed by mixing of the oil with a polymeric thickener (e.g. thermoplastic rubber) at an elevated temperature (e.g. above about 100°C).
  • the polymeric thickener thus dissolves in the oil.
  • the gel increases its viscosity while cooling down until it has passed its transition temperature and becomes solid. The process is fully reversible. After heating up above the transition temperature, the gel returns to liquid form.
  • the viscosity and transition temperature of the gel can be adjusted by the amount and type of thickener added to the oil. The more thickener, the higher transition temperature (corresponding to the knee in figure 2 ).
  • the transition temperature can be adjusted depending on application and requirements of each particular transformer, to above or below the operating temperature of the transformer, typically above.
  • the composite insulation 3 comprises or consists of the oil-based gel and particulate filler (sand) which is used as an inorganic filler.
  • the gel is used as a main insulation matrix and is manufactured from the oil by addition of the thickener (belonging to the group of e.g. styrene thermoplastic elastomers, block copolymer, etc.).
  • the thickener belonging to the group of e.g. styrene thermoplastic elastomers, block copolymer, etc.
  • the thermo-reversible gel which may be in solid or liquid form, depending on temperature. In both forms, the viscosities remain relatively stable in certain temperature ranges until the change of the phase appears.
  • the solid and liquid zones are separated by the transition zone in which the viscosity of the substance significantly drops (forms a knee as in figure 2 ) and the gel undergoes the phase change.
  • the insulated part, e.g. High-Voltage (HV) transformer winding 5 of the electrical device 1 is placed in an insulating or conductive shell 6 made of polymeric material or metal.
  • the shell 6 containing the part 5 is filled with the filler in form of sand.
  • the whole arrangement filler filled shell and part is heated up over the transition temperature of the gel.
  • the heated gel in liquid form is poured into the shell containing the filler sand and the part, and the liquid gel impregnates the filler and the part and fills the shell.
  • the impregnation step might be performed under vacuum conditions. After the impregnation, the gel-filler mixture is cooled which leads to solidification of the gel and creation of solid gel-filler insulation composite 3.
  • the gel-filler composite insulation 3 insulates the active part 4 of a Medium-Voltage (MV) instrument transformer.
  • the active part of the instrument transformer was placed in a plastic tank 2, filled with the filler (here sand) and finally impregnated with the oil-based gel in liquid form at a temperature of 140°C for 5 hours. Initially impregnation was done under vacuum for 1h and later it was continued in an oven.
  • MV Medium-Voltage
  • the impregnation gel consisted of Oil (Nynäs NS100 TM ) 99 wt%, and a thickener consisting of SEEPS TM 4099 (a tri-block copolymer consisting of polystyrene-b-poly(ethylene-ethylene/propylene)-b-polystyrene) 0.5 wt%, and SEP TM 1020 (a di-block copolymer consisting of polystyrene-b-poly(ethylene/propylene)) 0.5 wt% of the gel, both from Septon TM .
  • SEEPS TM 4099 a tri-block copolymer consisting of polystyrene-b-poly(ethylene-ethylene/propylene)-b-polystyrene
  • SEP TM 1020 a di-block copolymer consisting of polystyrene-b-poly(ethylene/propylene)
  • the following test was performed. Two electrodes were placed in the plastic tank 2 and filled with the composite insulation 3.
  • the common transformer oil was used as insulation material instead of the composite.
  • Such prepared samples were subjected to an arc fault test.
  • performing of the test resulted in explosion leading to complete destruction of the tank 2, splashing of the oil in large radius around the experimental setup and contamination of the surrounding environment.
  • the gel-filler composite 3 sample the result was completely different.
  • the plastic tank 2 remained intact and the whole composite insulation 3 remained inside the tank. There was only visible a relatively small crater in the middle of the tank where the insulation 3 was burned.
  • the composite insulation 3 with gel in solid form thus absorbed most of the explosion and, in conformity with solid resin (e.g. epoxy) insulation, there is no splashing of combustive and polluting material.
  • solid resin e.g. epoxy
  • FIG. 3 is a schematic flow chart of an embodiment of the method of the present invention.
  • the method is for encasing a primary winding of a transformer in a composite insulation 3.
  • the method comprises forming M1 an oil-based thermo-reversible gel by adding a thickener to an electrically insulating oil.
  • the method also comprises filling M2 the shell 6 of the transformer with an inorganic particulate filler such that the primary winding is surrounded by said filler.
  • the method also comprises heating M 3 the formed M1 thermo-reversible gel to a temperature which is above the transition temperature of the gel, whereby the gel transitions to its liquid form.
  • the method also comprises pouring M4 the heated M3 gel into the filled M2 shell, whereby the inorganic particulate filler is impregnated with the gel in liquid form to form the composite insulation 3.
  • the method also comprises cooling M5 the thermo-reversible gel to a temperature which is below the transition temperature of the gel, whereby the gel impregnating the filler transitions to its solid form, encasing the primary winding in the solid composite insulation 3 within the shell 6.
  • the inorganic particulate filler comprises sand. Sand is easily obtainable and relatively cheap.
  • the thickener comprises a styrenic block copolymer, e.g. a di- and/or a tri-block copolymer.
  • the gel is based on an oil selected among mineral oil, aromatic oil, ester oil and paraffinic oil, e.g. iso-paraffinic oil, or a mixture thereof.
  • the gel comprises dispersed particles of boron nitride.
  • the transformer is an instrument transformer or a power transformer.
  • the a primary winding 5 of the transformer is encased within the composite insulation 3 within a shell 6 enclosing the primary winding and separating the primary winding from a secondary winding 7 of the transformer.
  • the transformer has an operating temperature of up to 80°C, e.g. within the range of 50-80°C or 30-60°C.
  • the transition temperature is within the range of 60-110°C, e.g. within the range of 60-90°C or 80-110°C.
  • the heating M3 of the gel is to a temperature above 90°C or above 110°C, e.g. to within the range of 110-150°C.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Insulating Materials (AREA)
  • Insulating Of Coils (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (10)

  1. Transformateur (4) comprenant un enroulement primaire (5), un enroulement secondaire (7) et une coque (6) enfermant l'enroulement primaire (5) et séparant l'enroulement primaire (5) de l'enroulement secondaire (7), l'enroulement primaire (5) étant enrobé dans une isolation composite (3) à l'intérieur de la coque (6), l'isolation composite (3) comprenant une charge particulaire inorganique imprégnée d'un gel thermoréversible à base d'huile comprenant un épaississant, le gel étant sous forme solide, la charge particulaire inorganique comprenant du sable.
  2. Transformateur selon la revendication 1, la charge particulaire inorganique étant constituée de sable.
  3. Transformateur selon l'une quelconque des revendications précédentes, l'épaississant comprenant un copolymère séquencé styrénique, par exemple un copolymère di- et/ou tri-séquencé.
  4. Transformateur selon n'importe quelle revendication précédente, le gel étant à base d'une huile choisie parmi une huile minérale, une huile aromatique, une huile ester et une huile paraffinique, par exemple une huile isoparaffinique, ou un mélange de celles-ci.
  5. Transformateur selon n'importe quelle revendication précédente, le gel comprenant des particules dispersées de nitrure de bore.
  6. Transformateur selon n'importe quelle revendication précédente, le transformateur étant un transformateur d'instrumentation ou un transformateur de puissance.
  7. Transformateur selon n'importe quelle revendication précédente, le transformateur ayant une température de fonctionnement allant jusqu'à 80°C, par exemple dans la plage de 50-80°C ou 30-60°C.
  8. Procédé d'enrobage d'un enroulement primaire (5) d'un transformateur (4) dans un isolant composite (3), le transformateur (4) comprenant l'enroulement primaire (5), un enroulement secondaire (7) et une coque (6) enfermant l'enroulement primaire et séparant l'enroulement primaire de l'enroulement secondaire (7) du transformateur, le procédé comprenant :
    la formation (M1) d'un gel thermoréversible à base d'huile en ajoutant un épaississant à une huile électriquement isolante ;
    le remplissage (M2) de la coque (6) comprenant l'enroulement primaire (5) avec une charge particulaire inorganique comprenant du sable de telle sorte que l'enroulement primaire (5) est entouré par ladite charge ;
    le chauffage (M3) du gel thermoréversible formé (M1) à une température qui est supérieure à la température de transition du gel, de sorte que le gel passe à sa forme liquide ;
    le versement (M4) du gel chauffé (M3) dans la coque (6) remplie (M2), la charge particulaire inorganique étant imprégnée du gel sous forme liquide pour former l'isolant composite (3) ; et
    le refroidissement (M5) du gel thermoréversible à une température qui est inférieure à la température de transition du gel, de sorte que le gel imprégnant la charge passe à sa forme solide, enrobant l'enroulement primaire (5) dans l'isolation composite solide (3) à l'intérieur de la coque (6).
  9. Procédé selon la revendication 8, la température de transition étant dans la plage de 60-110°C, par exemple dans la plage de 60-90°C ou 80-110°C.
  10. Procédé selon la revendication 8 ou 9, le chauffage (M3) du gel étant effectué à une température supérieure à 90°C ou supérieure à 110°C, par exemple dans la plage de 110-150°C.
EP18162517.9A 2018-03-19 2018-03-19 Transformateur avec isolation en gel composite Active EP3544032B1 (fr)

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EP3544032A1 EP3544032A1 (fr) 2019-09-25
EP3544032B1 true EP3544032B1 (fr) 2022-07-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3764379B1 (fr) * 2019-07-12 2025-12-03 HSP Hochspannungsgeräte GmbH Transformateur d'instrument et procédé d'isolement de pièces
WO2023274498A1 (fr) * 2021-06-28 2023-01-05 Hitachi Energy Switzerland Ag Composant de puissance pour ensemble d'appareillage isolé

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1276195A (en) * 1993-12-22 1995-07-10 Raychem Limited Cable joint
SE511214C2 (sv) * 1997-12-22 1999-08-23 Asea Brown Boveri Dielektrisk gelande komposition, förfarande för framställning därav och en elektrisk DC-kabel omfattande ett med sådan komposition impregnerat isoleringssystem
SE511215C2 (sv) * 1997-12-22 1999-08-23 Asea Brown Boveri Dielektrisk gelande komposition, användning därav, isolerad elektrisk DC-kabel omfattande sådan komposition och förfarande för framställning därav
SE514063C2 (sv) * 1997-12-22 2000-12-18 Abb Ab Förfarande för framställning av en elektrisk anordning med ett isoleringssystem som omfattar en porös, fibrös och/eller laminerad fast del impregnerad med en dielektrisk vätska, en porös, fibrös och/eller laminerad kropp och användning därav i en elektrisk anordning
DE10110062A1 (de) * 2001-03-02 2002-09-05 Abb Research Ltd Verfahren zur Herstellung einer elektrischen Isolation in einem Hochspannungsgerät
EP2048673B1 (fr) * 2007-10-12 2014-05-14 ABB Research Ltd. Dispositif pour le raccordement électrique, procédé pour la fabrication d'un tel dispositif et installation d'alimentation électrique ainsi équipée
CN102301438B (zh) * 2009-02-03 2013-09-11 Abb研究有限公司 电绝缘体

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