WO2025201785A1 - Traversée et appareil électrique - Google Patents

Traversée et appareil électrique

Info

Publication number
WO2025201785A1
WO2025201785A1 PCT/EP2025/055185 EP2025055185W WO2025201785A1 WO 2025201785 A1 WO2025201785 A1 WO 2025201785A1 EP 2025055185 W EP2025055185 W EP 2025055185W WO 2025201785 A1 WO2025201785 A1 WO 2025201785A1
Authority
WO
WIPO (PCT)
Prior art keywords
bushing
main part
ribs
flange
projecting ribs
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.)
Pending
Application number
PCT/EP2025/055185
Other languages
English (en)
Inventor
Jan Czyzewski
Robert Platek
Cenk Kurtulus
Orhan Akbas
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 Ltd
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.)
Filing date
Publication date
Application filed by Hitachi Energy Ltd filed Critical Hitachi Energy Ltd
Publication of WO2025201785A1 publication Critical patent/WO2025201785A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • 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
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
    • 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
    • H01B17/34—Insulators containing liquid, e.g. oil

Definitions

  • the present disclosure relates to a bushing and a l iquid insulated electrical apparatus comprising the bushi ng.
  • the electrical apparatus may be a transformer or a swit chgear, forexample.
  • a bushing for example enables a conductor to pass t hrough a wall of an electrical apparatus, providing electric al insulation between the conductorand the wall.
  • US 2010/284133 A1 relatesto a method ofproducing an electricpowerdevice including a tubularshellof an electrically insulating polymer in which there is p rovided a screen of an electrically conducting material, wher ein the screen is placed in a mould, the mould is filled wi th a resin, and the resin is permitted to solidify in th e mould.
  • the screen is positioned in the mould such that a p eripheral surface thereof is in supporting contact with a par t of the mould.
  • WO 2007/065912 A1 relatesto a bushing forenergy distribution and transmission has an insulating bod y in which a high-voltage contact bolt is at least partially e mbedded, and having a flange, which is connected to the insu lating body, for fixing the bushing in a through-opening o f a containerwallatground potential.
  • the insulating body has an inner wall region, which, owing to the injection -molding, bearsflatagainstthe high-voltage contactbolts, and an outer wall region, which is connected to the flange and is connected to the inner wall region via a connecting section.
  • P2024,0078 WO N /P230197WO01 February26,2025 -2 - US 2179356 A relates to a bushing with an outside insulator being disposed substantially concentric with a cent ral insulator.
  • SE 506172 C2 relates to an insulator.
  • the insulato r consists of a tube which is made from a thermoplastic weldab le material. A number of pre-fabricated bushings are a pplied about the tube.
  • the bushings are made from a rubbe r-like material,such ase.g.silicone rubber. Itisdesirable to provide a bushing thatprovides a reliable operation.
  • Embodimentsofthe disclosure relate to a bushing.
  • the bushing isconfigured fora liquid insulated electricalapparatus.
  • the bushing comprisesan electricalconductor.
  • the bushing comprises an insulator body.
  • the insulator body comp rises a main part.
  • the main part can be also referred to as insulator core.
  • the insulator body comprises a plurality of p rojecting ribs.
  • the main part comprises a hollow cylinder sha pe.
  • the main part comprises one single holl ow cylinder, from with the projecting ribs project inw ards.
  • the projecting ribs each projectradiallyinwardsfrom the main part.
  • the projecting ribs are internal ribs.
  • the weathershed iscompletelyformed out ofthe P2024,0078 WO N /P230197WO01 February26,2025 -9 - elastomericmaterial.
  • the weather shed comprises a protrusion of the main part, which is covered by the outer cover, such that the weather s hed is formed by the main part and the outer cover togethe r.
  • the number of pr ojecting ribs depends on the diameter of the bushing.
  • the number of ribs is not less than 3, in particular si x ribs or more and 12 ribs or less.
  • the projecting ribs eac h comprise the rib thickness transverse to the device of proje ction with a value of 0.5 mm or more and 10 mm or less.
  • the rib thickness is between 25% and 100% of the wall t hickness.
  • the rib thickness is the same size o r smaller than the wall thickness.
  • the extension of the projecting ribs 13 0 across the flange 118 reinforce the flange attachment to t he main part 112 and limits a deflection of the flange 118.
  • the flange 118 is connected to the main part 112 at a c onnection 119.
  • the projecting ribs 130 extend over the connec tion 119 on the innerside 114.
  • the main part 112 comprises an upper part 121 and a lower part 122.
  • T he lower part 122 comprises the hollow cylinder shape 113 an d the projecting ribs130 aswellasthe flange 118.
  • the upper part 121 is arranged on an end of the low er part 122 facing away from the wall 201 along the longitu dinal axis 102.
  • the upperpart121 is inclineded with respectto the longitudinal axis 102 and overlaps the lower part 1 22 in part.
  • the upper part forms a weather shed and extends the creepage path along the outerside 129.
  • the upper part 121 is fixed to the conductor 101 by a holder 126.
  • the lower part 122 is ar ranged on the wall 201.
  • a conductor seal 140 is arranged on t he conductor 101 and pressed vertically along the long itudinal axis102 againsta sealseat125 ofthe lowerpart 122 bythe upper part 121.
  • This compression force 105 is maint ained by fixing the upper part 121 with the holder 126 at th e conductor101.
  • a gap 109 is arranged axially between the upper par t 121 and the lower part 122. The transition between the uppe r part 121 and the lowerpart122 issealed via the conductor seal140.
  • the conductor 101 is supported via an insulating support 107 at the wall 201.
  • the main pa rt 112 extends elongated over the wall 201 towards the sup port 107 along the longitudinal axis 102.
  • the p rojecting ribs 130 extend over the wall 201 along the longitu dinal axis 102.
  • the main part 112 is reinforced by th e projecting ribs 130 also inside the tank of the ele ctrical apparatus 200. This allows a better resistance agai nst the cantilever force 104.
  • the length of this protrusion is large en ough to prevent an electric flashover to happen in the insu lating liquid 103 between the tank wall 201 and the conduc tor 101 of the bushing 100.
  • the flange ribs 130 enable a robust mechanical stru cture against flange deflection of the flange 118 under t he cantilever force 104 and the compression forces 105 , 106.
  • FIG. 3 shows an embodiment of the bushing 100 whi ch corresponds to the embodiment of Figure 1.
  • flange ribs 170 are provided.
  • the flange ribs 170 a re arranged at the flange 118 to support the flange 11 8 against a bending and/or deformation.
  • the flange ribs 170 a re radially arranged between the outer side 129 and th e flange 118 on a side of the flange 118 facing the wall 201 .
  • the flange ribs 170 provide a robust mechanical str ucture against flange deflection under cantilever forces 1 04, and under compression forces 105, 106.
  • the placement of the flange ribs 170 on the side of the flange 118 facin g the wall 201 contributes to a smooth outer area of the flang e 118, which helpsto avoid contamination.
  • Figure 4 which may be helpful to better understand the invention, shows an example of the bushing 100.
  • the insulatorbody110 additionally comprises an inner part 117.
  • the projecting ribs 130 hav e no free ends 135 and do not directly face the electrical co nductor 101 due to the inner part 117.
  • the inner part 117 c omprises a hollow cylinder shape and is coaxially arranged wit h the main part 112.
  • the inner part 117 provides additional ri gidity, in particular against the compression 105, 106. Furthe r, the inner part 117 may constitute an additional barrier for electric insulation between the conductor 101 and t he wall 201.
  • the projecting ribs 130 radially extend betwee n the main part112 and the innerpart117.
  • Figure 4 shows the inner part 117 and the flange rib 170.
  • the inner part 117 is provided and the flange rib 170 is omit ted.
  • Figure 5 showsan embodimentwith elongated flange ribs170 which serve as holders for the gasket 160, as alrea dy mentioned above.
  • four of t he flange ribs 170 are elongated to hold the gasket 160. Of c ourse, this number is just an exemplary number. It is poss ible to have lesselongated flange ribs170 asholdersfor the gasket 160 or more than four elongated flanges 170.
  • FIGS. 6 to 8 show embodimentsofthe bushing 100 with the main part realized in one single piece.
  • the upper p art 121 as for example shown in Figures 1 to 5, is replaced by a hood 128.
  • the hood 128 is, for example, not made of ther moplastic material.
  • the hood 128 for example comprises an ele ctrically conductive material, for example metal.
  • the conduct or seal 140 is pressed between the hood 128 and the seal se at 125 of the main part 112.
  • the hood 128 is fixed to the con ductor 101.
  • the embodiments of Figures 6 to 8 in particular are applicable for medium voltage bushings 100.
  • a longe r creepage path is realized by the shape of the insulator body 110.
  • the main part112 comprisesweathersheds116.
  • the weather sheds extend the creepage path.
  • the we ather sheds116 are formed asintegralpartsofthe main part112.
  • Figures 6 to 8 exemplarily show two weather sheds 1 16. It is also possible to provide just one single weather sh ed 116 or more than two weathersheds116,forexample three ormore.
  • the weathersheds116 radiallyprojectoutwardson the outer side 129 ofthe main body112.
  • the projecting ribs 130 and the weather sheds 116 are arranged radially opposit e each other.
  • the insulatorbody110 isfixed to the wall201 by a flange clamp 111.
  • the flange clamp 111 isa separate part which is fixed to the wall 201, for example by a screw conne ction and exertsa force on the flange 118.
  • de-airing is incorporated in the conductor 101 to degas the inner volume of the bush ing 100 when installed on the apparatus 200 and filled with insulating liquid 103.
  • an additional metallic intermediate ring is arranged between the main part 112 and the hood 128.
  • the conductorseal140 iscompressed between this ring and the hood 128. De-airing is provided i n the ring in thisembodiment.
  • the electrical conductor 101 extends only partly al ong the main part 112.
  • An electrically conductive conductor extension 108 is electrically and mechanically connected with the conductor 101 and extends further longitudinally ac ross the wall 201. It is possible that a longer electrical c onductor 101 which extends further across the wall 201 is pr ovided and the conductor extension 108 is omitted.
  • the conductor 101 extends through the whole axial lengt h of the main part112.
  • the main part 112 extends axially across the wall 2 01 to provide an electrical insulation inside the tank in the liquid 103.
  • the end 127 ofthe main part112 extendslongerinto the tankin the medium voltage bushings than in the low voltage bushings according to Figur es 1 to 5.
  • Figure 7 shows an embodiment of the bushing 100 wit h a different mounting of the bushing 100 to the wall 2 01 than shown in Figures6 and 8.
  • the flange 118 comprises an opening 120 through whi ch a mounting element123 extends.Thus,the additional flange clamp 111 can be omitted.
  • the mounting interface is integrated in the flange 118.
  • the main part 1 12 made out of the thermoplastic material provides the moun ting interface for fixing the bushing 100 to the wall 20 1.
  • the main body111 comprisesadditionalflange ribs 170.
  • the additionalflange ribs170 are arranged to provide additional mechanical reinforcement to the flange 118.
  • the opening 120 and/or the flange ribs 170 are positioned in an area screened from electricfield stressby appropriate shielding structure (not explicitly sho wn), so that,in case contamination getscollected in that area,it doesnothave negative influence on the insulation properties ofthe insulatorbody110.
  • the main body 112 with the integrated mounting feat ure on the outer flange 118 has less components by avoiding th e flange clamp 111 and a robustmechanicstructure.
  • P2024,0078 WO N /P230197WO01 February26,2025 -24 - Figure 8 shows an embodiment with the main part 112 according to Figure 6 with additional corrugations 134 on the main part 112 inside the tank in the liquid 103.
  • further projecting ribs133 are arranged on the innerpart 117 which isprovided corresponding to the innerpart117 as shown in Figure 4.
  • the further projecting ribs 133 project radially in ward towardsthe conductor100 from the innerpart117.
  • the further projecting ribs 133 are elongated along the longitudinal axis 102 like the projecting ribs 130.
  • the furtherprojecting ribs comprise each the free end 135.
  • the projecting ribs 130 have no free ends 135 and do no t directly face the electricalconductor101 due to the inner part117.
  • the furtherprojecting ribs133 and the innerpart 117 provide more mechanical resistance against cantilev er forces 104,even with a largerlongitudinallength ofthe insulator body 110.
  • a second barrier for electri c insulation between the conductor 101 and the tank w all 201 is provided.
  • the inner part 117 is shorter along the longitudina l axis 102 than the main part112.
  • the further projecting ribs 133 and the projecting ribs 130 are shorter th an the inner part 117 and the man part 112.
  • the corrugations 134 are formed to further extend t he creepage length in the insulating liquid 103.
  • P2024,0078 WO N /P230197WO01 February26,2025 -25 - Figures 9 and 10 show embodiments of the bushing 10 0 with an additional outer cover 150.
  • the outer cover 150 can be combined with the embodiments of Figures 1 to 5, ac cording to which the main part 112 comprises a plurality of se parate parts, as shown in Figure 9.
  • the outer cover 150 ca n also be provided at the other embodiments as shown in Figur es 6 to 8, according to which the main part 112 is provided by one single piece. This is exemplarily shown in Figure 1 0.
  • the outer cover 150 comprises an elastomeric materi al 151 or consists of the elastomeric material 151.
  • the elastomeric material 151 is silicone rubber which p rovides a hydrophobicsurface.
  • the elastomeric material 151 is chemically bonded t o the thermoplastic material 115 of the main part 112.
  • the elastomericmaterial151 forexample isone of moldable or extrudable liquid silicone rubber, high consiste ncy rubber, and high temperature vulcanization silicone rubber.
  • the curable elastomeric material 151 i s applied in liquid form and then hardens to form the cover 1 50.
  • Self-adhesive silicone rubber can be used to produc e the outer cover 150.
  • the self-adhesiv e silicone rubber contains chemical coupling agents to form th e chemical bond between the outer side 129 of the thermoplasti c material 115 of the main part 112 and the solidified silicon e rubber.
  • silane-based agents chemically react ive both with the surface ofthe thermoplasticmaterial115 and with the other components of the elastomeric material 15 1, in particular the silicone rubber mixture and/or other P2024,0078 WO N /P230197WO01 February26,2025 -27 - constituents of the curable elastomer composition f orming the elastomeric material, in particular the curable sil icone elastomer composition, are provided to establish th e chemical bond.
  • the thin wall thermoplastic main part 112 can be used and additio nally the weathersheds152 can be easilyprovided.
  • the different features of the different embodiments according to Figures1 to 10 can be combined with each other in any combination.
  • the outer cover 150 can b e provided at any of the embodiments according to Figures 1 to 8. Every feature described with respect to one of the embodi ments is also disclosed herein with respect to the other emb odiments, even if the respective feature is not explicitly me ntioned in the context of the specific embodiment.
  • the bushing 100 comprises atleast one or more of the following in any combination: th e inner part 117 attached to the inner edges of the ribs 13 0 for adding more withstand to the vertical compression f orces 105, one or mor weather sheds 116, 152 attached to the a ir-end of the main part 112 of the insulator body 110 for pro viding electric insulation between the conductor 108 and t he tank wall 201, flange mounting features integrated in th e thin- wall structure of the main part 112 like the openin g 120, corrugations 134 on the oil-end of the main part 11 2 to increase the creepage length ofthe oilend ofthe bushing 100, oil-end extension of the inner part 117 for pr oviding additional insulation on the oil end, extensions of the flange ribs 170 forming gasket holders to precisely center the gasket 160 and to hold it together with the ins ulator body 110 when assembling the bushing 100 on the app a
  • the projecting ribs130 provide a robust mechanical structure, in particular against the compression fo rces 105, 106 and the cantilever force 104 both at elastic lo ads (short time) and against creep (long time). Thus, a reliab le bushing 100 isprovided.

Landscapes

  • Insulators (AREA)

Abstract

L'invention divulgue une traversée (100) pour un appareil électrique isolé par liquide (200). La traversée (100) comprend un conducteur électrique (101) et un corps isolant (110) à travers lequel s'étend le conducteur électrique (101), le corps isolant (110) comprenant une partie principale (112) et une pluralité de nervures saillantes (130), la partie principale (112) comprenant une forme de cylindre creux (113) et les nervures saillantes (130) faisant chacune saillie radialement vers l'intérieur à partir de la partie principale (112) et les nervures saillantes (130) comprenant chacune une extension principale (131) le long d'un axe longitudinal (102) du conducteur (101) et une extrémité libre (135) faisant face au conducteur électrique (101).
PCT/EP2025/055185 2024-03-27 2025-02-26 Traversée et appareil électrique Pending WO2025201785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP24166820.1A EP4625446A1 (fr) 2024-03-27 2024-03-27 Douille et appareil électrique
EP24166820.1 2024-03-27

Publications (1)

Publication Number Publication Date
WO2025201785A1 true WO2025201785A1 (fr) 2025-10-02

Family

ID=90481989

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/055185 Pending WO2025201785A1 (fr) 2024-03-27 2025-02-26 Traversée et appareil électrique

Country Status (2)

Country Link
EP (1) EP4625446A1 (fr)
WO (1) WO2025201785A1 (fr)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179356A (en) 1936-05-21 1939-11-07 Westinghouse Electric & Mfg Co Bushing
US4742103A (en) 1986-04-11 1988-05-03 Toray Silicone Co., Ltd. Curable organopolysiloxane compositions exhibiting improved adhesion
EP0493791A1 (fr) 1990-12-25 1992-07-08 Dow Corning Toray Silicone Company, Limited Compositions d'organopolysiloxane réticulable avec adhésion améliorée à l'état durci
EP0497349A2 (fr) 1991-01-30 1992-08-05 Dow Corning Toray Silicone Company, Limited Compositions d'organosiloxanes ayant une adhésion améliorée
US5595826A (en) 1995-10-11 1997-01-21 Dow Corning Corporation Curable organopolysiloxane compositions with improved adhesion
SE506172C2 (sv) 1996-02-29 1997-11-17 Ramkiw Ab Anordning för isolering av högspänningsledare
US20030236380A1 (en) 2002-06-14 2003-12-25 Wacker-Chemie Gmbh Self-adhesive addition-crosslinking silicon compositions
EP0875536B1 (fr) 1997-05-02 2004-03-24 GE Bayer Silicones GmbH & Co. KG Compositions d'élastomères de silicone réticulables par réaction addition, leur procédé de préparation, procédé de préparation de piéces moulées en matériau composite et leur utilisation
US6743515B1 (en) 1999-12-09 2004-06-01 Wacker-Chemie Gmbh Self-adhesive addition-crosslinking silicone compositions
US20050089696A1 (en) 2002-02-06 2005-04-28 Ge Bayer Silicones Gmbh & Co. Kg Self-adhesive, addition cross-linking silicone-rubber blends, method for their production, method for producing composite moulded parts and use of the latter
WO2007065912A1 (fr) 2005-12-09 2007-06-14 Siemens Aktiengesellschaft Perforation conique exterieure formee par moulage par injection
US20090211805A1 (en) * 2006-04-13 2009-08-27 Abb Research Ltd. Electric connection device and a method of producing such a device
US20100284133A1 (en) 2007-11-21 2010-11-11 Paal Kristian Skryten Method Of Producing An Electric Power Device, And An Electric Power Device

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2179356A (en) 1936-05-21 1939-11-07 Westinghouse Electric & Mfg Co Bushing
US4742103A (en) 1986-04-11 1988-05-03 Toray Silicone Co., Ltd. Curable organopolysiloxane compositions exhibiting improved adhesion
EP0493791A1 (fr) 1990-12-25 1992-07-08 Dow Corning Toray Silicone Company, Limited Compositions d'organopolysiloxane réticulable avec adhésion améliorée à l'état durci
EP0497349A2 (fr) 1991-01-30 1992-08-05 Dow Corning Toray Silicone Company, Limited Compositions d'organosiloxanes ayant une adhésion améliorée
EP0497349B1 (fr) 1991-01-30 1996-06-12 Dow Corning Toray Silicone Company, Limited Compositions d'organosiloxanes ayant une adhésion améliorée
US5595826A (en) 1995-10-11 1997-01-21 Dow Corning Corporation Curable organopolysiloxane compositions with improved adhesion
SE506172C2 (sv) 1996-02-29 1997-11-17 Ramkiw Ab Anordning för isolering av högspänningsledare
EP0875536B1 (fr) 1997-05-02 2004-03-24 GE Bayer Silicones GmbH & Co. KG Compositions d'élastomères de silicone réticulables par réaction addition, leur procédé de préparation, procédé de préparation de piéces moulées en matériau composite et leur utilisation
US6743515B1 (en) 1999-12-09 2004-06-01 Wacker-Chemie Gmbh Self-adhesive addition-crosslinking silicone compositions
US20050089696A1 (en) 2002-02-06 2005-04-28 Ge Bayer Silicones Gmbh & Co. Kg Self-adhesive, addition cross-linking silicone-rubber blends, method for their production, method for producing composite moulded parts and use of the latter
US20030236380A1 (en) 2002-06-14 2003-12-25 Wacker-Chemie Gmbh Self-adhesive addition-crosslinking silicon compositions
WO2007065912A1 (fr) 2005-12-09 2007-06-14 Siemens Aktiengesellschaft Perforation conique exterieure formee par moulage par injection
US20090211805A1 (en) * 2006-04-13 2009-08-27 Abb Research Ltd. Electric connection device and a method of producing such a device
US20100284133A1 (en) 2007-11-21 2010-11-11 Paal Kristian Skryten Method Of Producing An Electric Power Device, And An Electric Power Device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A. HERGERT ET AL., IEEE TRANS. DIELECTR. ELECTR. INSUL., vol. 24, no. 2, 2017, pages 1057
D. BODASC. KHAN-MALEK, SENS. ACTUATORS B: CHEM., vol. 123, 2007, pages 368

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