WO2018109843A1 - Appareil électrique à induction statique à isolation gazeuse - Google Patents

Appareil électrique à induction statique à isolation gazeuse Download PDF

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Publication number
WO2018109843A1
WO2018109843A1 PCT/JP2016/087097 JP2016087097W WO2018109843A1 WO 2018109843 A1 WO2018109843 A1 WO 2018109843A1 JP 2016087097 W JP2016087097 W JP 2016087097W WO 2018109843 A1 WO2018109843 A1 WO 2018109843A1
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WO
WIPO (PCT)
Prior art keywords
insulating layer
gas
static induction
insulating
conductor
Prior art date
Application number
PCT/JP2016/087097
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English (en)
Japanese (ja)
Inventor
野口　直樹
松下　正樹
義基 中澤
啓 高野
健史 千切
Original Assignee
株式会社 東芝
東芝エネルギーシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社 東芝, 東芝エネルギーシステムズ株式会社 filed Critical 株式会社 東芝
Priority to PCT/JP2016/087097 priority Critical patent/WO2018109843A1/fr
Publication of WO2018109843A1 publication Critical patent/WO2018109843A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/60—Composite insulating bodies
    • 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
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • 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

Definitions

  • Embodiments of the present invention relate to a gas-insulated static induction device used as a gas-insulated transformer or a gas-insulated reactor.
  • gas-insulated static induction devices such as small and highly safe gas-insulated transformers and gas-insulated reactors.
  • the gas-insulated static induction appliance is provided with a container for storing a winding.
  • the container is filled with, for example, SF 6 gas having a high pressure resistance as an insulating gas.
  • a lead wire is connected to the winding, and the lead wire is drawn from the winding.
  • the surface of the lead wire serves as an insulation weak point due to the generation of an electric field, and is a location where discharge due to dielectric breakdown is likely to occur.
  • the insulating film for example, a PET (Polyethylene terephthalate: PET) film having high insulating performance and relatively inexpensive is mainly used. Since the PET film is a plastic film, it has a high relative dielectric constant.
  • SF 6 gas is a global warming gas
  • the alternative gas include naturally derived gas, and examples thereof include air, nitrogen, oxygen, carbon dioxide, or a gas mainly composed of two or more of these. Since these naturally derived gases have a lower pressure resistance than SF 6 gas, when the insulation performance of the lead wire is ensured by covering the lead wire with the insulation film, the electric field at the outermost peripheral surface of the insulation film is sufficiently lowered. Therefore, it is necessary to wrap the insulating film to be covered around the lead wire several times and to secure a sufficient distance from the surface of the lead wire to the outermost peripheral surface of the insulating film. When the insulating film is wound around the lead wire several times, the insulating layer made of the insulating film becomes thick. As a result, the lead wire becomes large, leading to an increase in the size of the gas-insulated static induction device.
  • a method has been proposed in which a film in which unevenness is provided on one surface of an insulating film by embossing is wound around the surface of a lead wire and covered. According to this method, SF 6 gas enters the voids of the uneven portions, and the thickness band including the voids of the insulating film increases the dielectric breakdown strength of the entire insulating film.
  • a proposal has been proposed in which polyethylene naphthalate is wrapped around a polyphenylene sulfide film (PPS) in addition to a PET film to improve the heat resistance performance of the insulating film.
  • PPS polyphenylene sulfide film
  • a gas-insulated static induction appliance has also been proposed in which a thermoplastic elastomer film having a high elongation rate is coated on the outside of an embossed PET film to improve the adhesion of the PET film.
  • the above prior art aims to improve the dielectric breakdown strength of the entire insulating film by allowing SF 6 gas having a high dielectric breakdown strength to enter the void layer in the insulating film.
  • naturally derived gas since naturally derived gas has a lower pressure resistance than SF 6 gas, it is not expected to increase the dielectric breakdown strength even if the naturally derived gas enters the void layer in the embossed insulating film. That is, the technique of winding the lead wire with the embossed insulating film and covering it is effective only when the container is filled with SF 6 gas having a high dielectric breakdown strength. It was thought that another approach was necessary when filling the jar.
  • the naturally-occurring gas has a lower withstand voltage than the SF 6 gas, so the insulating layer made of the insulating film
  • the thickness is further increased, which leads to an increase in the size of the gas-insulated static induction appliance.
  • the problem to be solved by the present invention is to provide a gas-insulated static induction device that can be miniaturized even when a gas derived from nature is filled in a container.
  • the present inventors have wound an insulating layer having a low relative dielectric constant to lower the electric field value on the outermost peripheral surface of the insulating layer and an insulating layer having a high relative dielectric constant that inhibits electron acceleration.
  • the electric field value of the outermost peripheral surface of the insulating layer is effectively reduced, and the acceleration of electrons that are the starting point of dielectric breakdown occurring in the layer having a low relative dielectric constant is inhibited. It has been found that the insulation performance can be improved even when there is no high breakdown strength layer such as SF 6 gas in the insulation layer covering the conductor.
  • the gas-insulated static induction electrical appliance includes a conductor housed in a container filled with a naturally derived gas, a first insulating layer that covers the conductor, the conductor, and the first conductor.
  • a second insulating layer having a relative dielectric constant lower than that of the insulating layer, wherein the first insulating layer and the second insulating layer are alternately stacked and disposed toward the outside in the radial direction of the conductor. And extending continuously around the entire circumference of the conductor.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of a lead wire 100 drawn from a winding of a gas-insulated static induction device according to the first embodiment.
  • the gas insulated static induction machine has a container 6.
  • An insulating gas 5 is sealed in the container 6.
  • the container 6 is filled with a natural gas 5 as an insulating gas.
  • the naturally derived gas 5 is mainly composed of air, nitrogen, oxygen, carbon dioxide, or two or more thereof, and has a lower pressure resistance than SF 6 gas.
  • a winding (not shown) is provided in the container 6, and a lead wire 100 is drawn out from the winding.
  • the lead wire 100 is installed in the container 6 together with the winding.
  • the lead wire 100 drawn out from the winding includes a lead conductor 1 and an insulating layer 200.
  • the lead conductor 1 is a core made of a conductor.
  • the insulating layer 200 includes a first insulating layer 2 that covers the lead conductor 1, and a second insulating layer 3 that covers the lead conductor 1 and has a relative dielectric constant lower than that of the first insulating layer 2. Yes.
  • the first insulating layer 2 and the second insulating layer 3 are alternately stacked and disposed toward the outside in the radial direction of the lead conductor 1, and continuously extend and surround the entire circumference of the lead conductor 1. ing.
  • the insulating layer 200 is composed of a plurality of layers of a first insulating layer 2 disposed outside the lead conductor 1 and a second insulating layer 3 disposed outside the lead conductor 1.
  • the first insulating layer 2 and the second insulating layer 3 are made of insulating films made of different materials.
  • the insulating films made of different materials are wound around the lead conductor 1.
  • the first insulating layer 2 and the second insulating layer 3 are alternately wound around the lead conductor 1 a plurality of times. That is, the first insulating layer 2 and the second insulating layer 3 are wound so as to surround the periphery of the lead conductor 1, and the first insulating layer 2 and the second insulating layer 3 are wrapped around the lead conductor 1. They are stacked alternately.
  • the first insulating layer 2 and the second insulating layer 3 are alternately stacked, and the lead conductor 1 is covered to form an insulating layer composed of a plurality of layers.
  • the first insulating layer 2 and the second insulating layer 3 are stacked until the electric field on the surface of the outermost layer of the insulating layers is sufficiently smaller than the dielectric breakdown voltage of the insulating gas 5.
  • a first insulating layer 2 is laminated on the innermost shell adjacent to the lead conductor 1, and a second insulating layer 3 is laminated outside the first insulating layer 2.
  • the first insulating layers 2 and the second insulating layers 3 are alternately stacked up to the outermost peripheral surface.
  • the second insulating layer 3 is laminated on the innermost shell adjacent to the lead conductor 1, and the first insulating layer 2 is laminated on the outer side of the second insulating layer 3.
  • the second insulating layer 3 and the first insulating layer 2 may be alternately stacked up to the surface.
  • the first insulating layer 2 is stacked, the first insulating layer 2 is stacked outside the first insulating layer 2, and the first insulating layer 2 is further outside the first insulating layer 2.
  • the first insulating layer 2 may be further laminated on the outside thereof.
  • the second insulating layer 3 is laminated, the second insulating layer 3 is laminated outside the second insulating layer 3, and the first insulating layer 3 is further outside the second insulating layer 3.
  • the second insulating layer 3 may be further laminated on the outside thereof.
  • the first insulating layer 2 and the second insulating layer 3 are formed by stacking the first insulating layer 2 and the second insulating layer 3 in the insulating layer. It is only necessary that the insulating layers 2 and the second insulating layers 3 are alternately stacked.
  • the second insulating layer 3 is made of a material having a relative dielectric constant lower than that of the first insulating layer 2.
  • the first insulating layer 2 is made of PET (Polyethylene terephthalate: PET) film, PEN (Polyethylene terephthalate: PEN) film, PPS (Polyethylene sulfide film: PPS) film, silicon tape, rayon tape, or the like.
  • the second insulating layer 3 is made of insulating paper or crepe paper.
  • the first insulating layer 2 having a high relative dielectric constant hinders the acceleration of electrons that are the origin of dielectric breakdown.
  • the second insulating layer 3 having a low relative dielectric constant lowers the equipotential line so as to make the charge on the surface of the insulating layer sparse, in other words, lowers the potential at the same distance from the lead conductor 1. That is, while the potential of the surface of the first insulating layer 2 is lowered in the second insulating layer 3, the adjacent first insulating layer 2 is accelerated before electrons are accelerated to breakdown in the second insulating layer 3. This hinders the acceleration of electrons.
  • first insulating layer 2 and the second insulating layer 3 are alternately stacked until the electric field on the outermost peripheral surface of the insulating layer is sufficiently smaller than the dielectric breakdown voltage of the insulating gas 5, acceleration of electrons is inhibited. And the potential reduction can be appropriately separated, and the entire insulating layer is thinned, and electric field concentration can be prevented.
  • the electric field on the outer peripheral surface of the first insulating layer 2 can be lowered, so that only the first insulating layer 2 is repeatedly wound.
  • the insulating layer can be configured with a smaller number of layers and the thickness of the entire insulating layer can be reduced.
  • the gas-insulated static induction apparatus includes a lead conductor 1 housed in a container 6 filled with a natural gas 5, a first insulating layer 2 covering the lead conductor 1, and a lead conductor 1. And a second insulating layer 3 having a relative dielectric constant lower than that of the first insulating layer 2.
  • the first insulating layer 2 and the second insulating layer 3 are alternately stacked and disposed toward the outside in the radial direction of the lead conductor 1, and continuously extend and surround the entire circumference of the lead conductor 1. ing.
  • the insulating layer is configured with a smaller number of layers than the conventional one, and the entire insulating layer is thin. Therefore, it is possible to reduce the size of the gas-insulated static induction device.
  • the gas-insulated static induction electric appliance can be manufactured with fewer man-hours than before due to the reduction in the number of layers, the manufacturing cost of the gas-insulated static induction electric appliance can be reduced.
  • the first insulating layer 2 and the second insulating layer 3 change the thickness ratio of the first insulating layer 2 and the second insulating layer 3, for example, the thickness of the second insulating layer 3 is changed to
  • the thickness of the first insulating layer 2 may be at least equal to or greater than the thickness.
  • the second insulating layer 3 having a low relative dielectric constant is lighter in weight than the first insulating layer 2 having a high relative dielectric constant, and is often inexpensive and easy to process. For this reason, by increasing the thickness of the second insulating layer 3, the number of processing steps can be reduced and the weight of the entire insulating layer can be reduced.
  • the thickness of the second insulating layer 3 is too thick, the energy of electrons accelerated in the second insulating layer 3 increases, and the acceleration of electrons in the first insulating layer 2 can be stopped. There may be cases where this is not possible.
  • the lead wire 100 causes dielectric breakdown and discharges. Therefore, in order to avoid the discharge of the lead wire 100, the thickness of the second insulating layer 3 having a low relative dielectric constant is, for example, not more than 10 times the thickness of the first insulating layer 2, and the second It is desirable to prevent discharge of the lead wire 100 by setting the thickness of the insulating layer 3 to 10 mm or less.
  • a gas-insulated static induction electric machine having a smaller number of processing than the prior art can be manufactured. Can do.
  • the lead wire 100 drawn from the winding has been described as an example.
  • the lead wire 100 is an example of a conductor that requires a coating with an insulating film, and is not limited thereto. is not.
  • it can be used for a conductor with concentrated electric field, such as a bushing shield or an electrostatic ring. More specifically, it can be used for a conductor having a radius of curvature, a conductor having a curved electric force line, that is, an electrode other than a flat plate.
  • FIG. 2 is a cross-sectional view showing a schematic configuration of the lead wire 100 drawn from the winding of the gas-insulated static induction electric device according to the second embodiment.
  • 2A shows a cross-sectional view of the lead wire 100
  • FIG. 2B shows embossing
  • FIG. 2C shows an enlarged explanatory view of the region P in FIG. 2A. .
  • the first insulating layer 2 and the second insulating layer 3 are formed by a single insulating film IF.
  • the insulating film IF is made of PET film, PEN film, PPS film, silicon tape, rayon tape, or the like.
  • the insulating film IF has an uneven surface on one side S by embossing.
  • the unevenness is formed by partially crushing the insulating film IF on one surface S of the insulating film IF to a depth that does not reach the opposite surface R from the one surface S, and is formed by embossing from the non-embossed opposite surface R.
  • the thickness band up to the bottom surface B of the recessed portion is the first insulating layer 2.
  • the thickness band from the embossed one side S to the bottom surface B of the recess formed by embossing is the second insulating layer 3.
  • the second insulating layer 3 includes a cavity layer of a recess.
  • the second insulating layer 3 is formed by the natural gas 5 filled in the container 6 in which the winding is accommodated entering the gap of the recess.
  • the relative dielectric constant ⁇ 2 of the second insulating layer 3 is set lower than the relative dielectric constant ⁇ 1 of the first insulating layer 2.
  • ⁇ g ⁇ 2 ⁇ 1 (2)
  • the gas-insulated static induction apparatus includes an insulating film IF wound around the lead conductor 1.
  • Insulating film IF is formed with a recess having a depth that does not reach from one surface S to opposite surface R on one surface S.
  • the first insulating layer 2 is formed of a thickness band from the opposite surface R to the bottom surface B of the recess.
  • the second insulating layer 3 is a thickness band from one side S to the bottom surface B of the recess.
  • the second insulating layer 3 includes a concave space.
  • the gas 5 derived from nature can enter the void layer of the recess formed in the insulating film IF by embossing, and the second insulating layer 3 can be formed in the radial direction of the lead conductor 1. Therefore, the 1st insulating layer 2 and the 2nd insulating layer 3 can be formed with one insulating film IF.
  • the first insulating layer 2 and the second insulating layer 3 are alternately arranged. Compared to the case of stacking, the number of stacking can be reduced, and the gas-insulated static induction device can be manufactured with fewer man-hours than before, so that the manufacturing cost of the gas-insulated static induction device can be reduced.
  • embossing means what the unevenness
  • the surface of the insulating film IF may be physically uneven.
  • the surface of the insulating film IF may be processed by a laser to provide unevenness, or the surface may be provided with a mold or etching treatment of the insulating film IF. Good.
  • FIG. 3 is a cross-sectional view showing a schematic configuration of a plurality of layers formed by embossing laminated on a lead wire in a gas-insulated static induction device according to a third embodiment.
  • the outermost layer of the insulating layer composed of a plurality of layers is configured to be the first insulating layer 2.
  • the insulating layer other than the outermost layer is embossed to form a plurality of layers of the first insulating layer 2 and the second insulating layer 3.
  • the insulating layer is composed of a plurality of layers of the first insulating layer 2 and the second insulating layer 3 by wrapping the lead conductor 1 with the embossed surfaces S facing each other.
  • the outermost layer is the first insulating layer 2 having a high relative dielectric constant. Note that, as shown in FIG. 2B, a plurality of the first insulating layer 2 and the second insulating layer 3 can be obtained by winding all the embossed surfaces S toward the lead conductor 1 side.
  • the outermost layer may be the first insulating layer 2 having a high relative dielectric constant.
  • the surface R of the outermost layer of the plurality of insulating layers is smooth.
  • the surface R of the outermost layer is in contact with the insulating gas 5 on the surface that has not been embossed.
  • the surface R of the outermost layer can also be a factor that determines the insulating performance by the roughness of the surface in contact with the insulating gas 5. Therefore, the insulating performance can be further improved by the smoothness of the outermost surface R of the insulating layer.
  • the outermost layer of the insulating layers may be the first insulating layer 2 having a high relative dielectric constant.
  • the material of the first insulating layer 2 it is preferable to use a nonflammable or flame retardant material.
  • the insulating gas for example, when the naturally derived gas 5 mainly composed of air, nitrogen, oxygen, carbon dioxide, or two or more of these is used, the gas containing oxygen has an auxiliary property.
  • the lead conductor 1 is discharged by using a nonflammable or flame retardant material that does not allow oxygen to permeate from the surface R of the lead wire 100 to the outermost layer, for example, the relative permittivity of Since the high first insulating layer 2 can block oxygen, a fire can be prevented even when the lead conductor 1 is discharged.
  • a PET film or a PEN film as the material of the outermost layer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

L'invention concerne un appareil électrique à induction statique à isolation gazeuse avec lequel la taille peut être réduite même lorsqu'un récipient est rempli d'un gaz naturel. La présente invention comprend : un conducteur de fil 1 logé dans un récipient 6 rempli d'un gaz naturel; des premières couches isolantes 2 revêtant le conducteur de fil 1; et des secondes couches isolantes 3 recouvrant le conducteur de fil 1, les secondes couches isolantes 3 ayant une permittivité relative inférieure à celle des premières couches isolantes 2. Les premières couches isolantes 2 et les secondes couches isolantes 3 sont empilées en alternance vers le côté extérieur dans la direction radiale du conducteur de fil, et entourent le conducteur de fil 1 de manière à s'étendre de façon continue autour de la périphérie entière du conducteur de fil 1.
PCT/JP2016/087097 2016-12-13 2016-12-13 Appareil électrique à induction statique à isolation gazeuse WO2018109843A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2016/087097 WO2018109843A1 (fr) 2016-12-13 2016-12-13 Appareil électrique à induction statique à isolation gazeuse

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Application Number Priority Date Filing Date Title
PCT/JP2016/087097 WO2018109843A1 (fr) 2016-12-13 2016-12-13 Appareil électrique à induction statique à isolation gazeuse

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434095A (en) * 1977-08-22 1979-03-13 Toshiba Corp Multiple layer insulated lead for high tension device
JP2003501780A (ja) * 1999-06-02 2003-01-14 タイコ・エレクトロニクス・コーポレイション 絶縁された電気導体
JP2003142318A (ja) * 2001-11-01 2003-05-16 Hitachi Ltd ガス絶縁変圧器
WO2013094488A1 (fr) * 2011-12-20 2013-06-27 三菱電機株式会社 Fil de connexion pour dispositif à induction statique, structure isolante pour fil de connexion, transformateur ayant celui-ci et procédé d'isolation de fil de connexion
JP2015018912A (ja) * 2013-07-10 2015-01-29 株式会社東芝 ガス絶縁変圧器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434095A (en) * 1977-08-22 1979-03-13 Toshiba Corp Multiple layer insulated lead for high tension device
JP2003501780A (ja) * 1999-06-02 2003-01-14 タイコ・エレクトロニクス・コーポレイション 絶縁された電気導体
JP2003142318A (ja) * 2001-11-01 2003-05-16 Hitachi Ltd ガス絶縁変圧器
WO2013094488A1 (fr) * 2011-12-20 2013-06-27 三菱電機株式会社 Fil de connexion pour dispositif à induction statique, structure isolante pour fil de connexion, transformateur ayant celui-ci et procédé d'isolation de fil de connexion
JP2015018912A (ja) * 2013-07-10 2015-01-29 株式会社東芝 ガス絶縁変圧器

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