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EP0455538A1 - Wanddurchführung für ein elektrisches Kabel - Google Patents

Wanddurchführung für ein elektrisches Kabel Download PDF

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Publication number
EP0455538A1
EP0455538A1 EP91401065A EP91401065A EP0455538A1 EP 0455538 A1 EP0455538 A1 EP 0455538A1 EP 91401065 A EP91401065 A EP 91401065A EP 91401065 A EP91401065 A EP 91401065A EP 0455538 A1 EP0455538 A1 EP 0455538A1
Authority
EP
European Patent Office
Prior art keywords
wall
sleeve
coating
conductive
core
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.)
Withdrawn
Application number
EP91401065A
Other languages
English (en)
French (fr)
Inventor
Gérard Jacques Lencot
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.)
Pirelli Cables y Sistemas SA
Cables Pirelli SA
Original Assignee
Pirelli Cables y Sistemas SA
Cables Pirelli SA
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 Pirelli Cables y Sistemas SA, Cables Pirelli SA filed Critical Pirelli Cables y Sistemas SA
Publication of EP0455538A1 publication Critical patent/EP0455538A1/de
Withdrawn legal-status Critical Current

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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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01B17/28—Capacitor type

Definitions

  • the invention relates to a wall crossing for an electric cable. It relates in particular to a crossing of a transformer housing or of electrical equipment such as a switching device.
  • Such a crossing must, in addition to providing insulation from the wall which is often metallic, preferably also provide guidance for an electric field arising in the crossing.
  • the problem which the invention aims to solve is to provide a wall crossing which, while being simple in constitution, makes it possible not only to provide insulation with respect to the wall, but also to correctly guide the electric field from and on the other side of this wall and to set the different electrical potentials established within the crossing at a well-defined value.
  • the invention relates to a wall crossing for an electric cable, characterized in that it comprises a conductive core extending along an axis, an insulating sleeve, in one piece, surrounding the conductive core so as to produce a clamping force thereon, and bearing, at least on a portion of axially median outer surface, a coating capable of guiding an electric field originating in the sleeve, said coating being arranged axially so that 'it extends over a certain length on either side of said wall, fixing means for fixing the sleeve on said wall, and electrical connection means for electrically connecting the conductive coating to a reference potential.
  • the sleeve can be manufactured by molding, or overmolding on the conductive core; in addition, the means for guiding the electric field only comprise an outer covering of the sleeve, which can be produced in a simple manner, in particular by painting, spraying under vacuum, or spraying hot.
  • the guiding of the electric field is carried out correctly, that is to say not only just opposite the wall but also at some distance from it along the crossing.
  • the electrical potentials are well defined: that of the conductive core is at nominal operating potential and that of the conductive coating at said reference potential, for example to earth.
  • Another problem that the invention aims to solve is to provide electrical isolation between one end of the conductive core and the wall or said coating, when this end opens into the open air or into an insulating fluid such as oil.
  • the sleeve carries, at least at one end, protrusions forming isolation fins.
  • the invention aims to solve is to fix the sleeve on the wall without having to provide fixing lugs on the sleeve and corresponding fixing means on the wall.
  • the sleeve fixing means comprise a thread carried by the outer surface of the sleeve and arranged to cooperate with a thread carried by the wall.
  • said electrical connection means comprise an electrical contact surface between said coating and a conductive part of the wall.
  • the bushing comprises a conductive base arranged to support the sleeve in the region carrying the coating, and to bear on the wall. It then suffices to design the base in a form adapted each time to the fixing means provided on the wall.
  • the base can for example comprise fixing lugs intended to be crossed by threaded rods.
  • this base provides both the support function of the sleeve and the electrical connection function of the coating.
  • the base comprises a peripheral crown portion intended to cooperate with the wall, and a central cylinder portion intended to cooperate with the sleeve.
  • said internal thread is carried by the central cylinder portion.
  • the bushing comprises an insulating flange covering one face of the conductive base intended to be distant from the wall, in which case it cooperates with a clabot itself mounted on a threaded rod secured to the wall.
  • the bushing receives a cable end connection device which is simply fitted onto the bushing. It is then necessary to attach this device to the crossing to ensure absolute fixing thereof.
  • the insulating flange carries attachment means intended to cooperate with fixing means arranged to fix one end of the cable on the bushing.
  • the cable end connection device is isolated from the wall, which facilitates the implementation of an electrical resistance test of the cable sheath, known as "d ' sheath test ".
  • the cable end connection device such as a T or L-shaped plug, hinders access to one of the attachment means of the flange. In this case, it must be possible to modify the relative angular position of the connection device with respect to the attachment means.
  • the insulating collar is rotatably mounted on the bushing. Under these conditions, it suffices to modify the angular position of the flange to solve the aforementioned problem.
  • the bushing 1 shown in FIG. 1 comprises an electrically insulating, one-piece core 2, molded either from a thermoplastic or thermosetting material, in particular from epoxy resin, or from an elastomer material, which takes the general form of a hollow cylinder of circular section, having an axis 3.
  • An outer surface of the core 2 carries, in an axially median region, corrugations forming a thread 4, and in an end region, other corrugations forming fins of electrical insulation 5.
  • the core 2 further comprises an annular rim 6 disposed at one end of the thread 4 furthest from the fins 5.
  • the other regions of the core 2 are smooth.
  • the core 2 carries, over the entire surface of its thread 4 and over that of a portion between it and the fins 5, a conductive coating 10 added by any suitable means, in particular by painting, spraying under vacuum, or spraying hot.
  • a conductive core 11 Inside the core 2 is housed a conductive core 11.
  • the core 2 is made of a thermoplastic or thermosetting material, it is advantageously molded onto the conductive core 11.
  • the conductive core 11 can also be force-fitted therein. In either case, the arrangement will be such that the core 2 will produce an energetic clamping on the conductive core 11, guaranteeing intimate contact between these two parts and therefore the absence of air pockets, which would be detrimental to the quality of electrical insulation.
  • one end 12 of the core opens out to the outside of the core 2 and is threaded, while another end 13 is substantially flush with the neighboring end of the core and has an elastic member for electrical contact.
  • the conductive core 11 is made of metal, in particular copper or brass.
  • the crossing also includes an electrically conductive base 20, in particular made of light metal alloy.
  • the base 20 comprises a portion forming a crown 21 and a portion forming a cylinder 22. It is coaxial with the core 2.
  • the portion forming a circular crown extends substantially in a plane and carries, on one face, an annular rim 23 extending axially, in a radially median region. If necessary, several fixing lugs 24, only one of which is visible in FIG. 1, are distributed around the axis 3 and extend in the plane of the crown, radially outward.
  • the crown portion 21 has a radially inner circular opening 25.
  • the cylinder portion 22 has an internal diameter substantially equal to that of the opening 25 and is supported by one end on an edge of this opening, on a face of the ring portion 21 which is the furthest from the rim 23.
  • the cylinder portion 22 carries, on an inner face, a thread corresponding to the thread 4 carried by the core 2 and extending axially over the same length. It has, at an end remote from the crown portion 21, an inner annular groove 26 housing an O-ring 27.
  • the bushing 1 finally comprises a flange 30 made of an electrically insulating material, such as a thermoplastic or thermosetting material.
  • the collar 30 has a bell shape. It has a circular central opening 31 of dimensions corresponding to the diameter of the cylinder portion 22 of the base 20. This opening 31 is surrounded by an annular flange 32 extending axially outwards.
  • the flange 30 has an outside diameter equal to that of the crown portion 21 of the base 20. In its thickness, are formed several through holes 33 distributed peripherally and intended to accommodate fastening elements such as perforated tabs 34 or a threaded insert not shown allowing the coupling of a cable connection piece such as a socket. These fixing elements are slid into the holes 33 by a lower face of the flange 30 and cooperate with a shoulder of the holes forming an axial stop.
  • FIG. 1 is partially shown a metal cover 40 of a low voltage LV / medium voltage MV electrical transformation tank having a circular opening 41 of diameter slightly greater than the diameter of the annular rim 23 of the base 20.
  • the base 20 rests, by its portion forming a crown 21, on the cover 40, with the interposition of a flat seal 42. Its rim 23 extends axially slightly inside the opening 41 of the cover 40.
  • the flat seal 42 is replaced by an O-ring placed in an annular groove in the base 20.
  • the collar 30 covers the cylinder portion 22 of the base 20 and rests on its crown portion 21.
  • the core 2 of the bushing 1 is screwed into the base 20 until it abuts on the end of the cylinder portion 22 of the base 20 and compress the O-ring 27.
  • An electrical contact exists between the conductive coating 10 of the core 2 and the base 20, over the entire surface of the thread 4 of the core.
  • the core 2 is immobilized in rotation relative to the base 20, for example by means of a localized bead of glue. This bead of adhesive can be designed to complete the seal produced by the O-ring 27 or even ensure this seal on its own.
  • the annular rim 6 of the core 2 faces that 32 of the flange but is moved away from it with a slight axial clearance, so that the flange is free to rotate about the axis 3.
  • the core does not have a thread 4 but is housed in an adjusted manner in the crown portion 22 of the base 20 and is immobilized axially by an annular pin.
  • the cover 40 carries several threaded rods 43 distributed around its circular opening 41.
  • the fixing of the bushing 1 on the cover 40 can be carried out in particular in one of the following two ways.
  • a metal flap 44 bearing at one end on the cover 40 and by another end on the flange 30.
  • Each flap 44 is held by nut 45.
  • the electrical connection between the base 20 and the cover 40 is ensured by a metallic sheet contact 39 pinched at one end between the base 20 and the flange 30, and at another end between the flange 30 and the one of the chicks 44.
  • a second way of fixing the bushing 1 on the cover 40 consists in providing the base 20 with lugs 24 intended to be crossed by the threaded rods 43. A nut 38 is then mounted on each threaded rod and bears on the base 20. This fixing simultaneously ensures the electrical connection between the base 20 and the cover 40.
  • connection sleeve 47 Fixed by a nut 48.
  • the transformer is filled with oil to a level 49 such that the fins 5 of the core 2 are immersed as well as one end of the conductive coating 10 adjacent to these fins.
  • the external conductive layer 53 has one end disposed substantially opposite one end of the conductive coating 10 so as to ensure continuous guidance of an electric field originating in the socket 50 and the core 2.
  • a stirrup 54 comprises several tie rods 55 hooking in the perforated tabs 34 of the flange 30: as necessary, the flange 30 is angularly displaced around the axis 3 to arrange the perforated tabs 34 opposite the tie rods 55.
  • the stirrup 54 is also supported centrally on the socket 50 by means of a threaded hook 56.
  • electric field lines extend along the insulating layer 52 of the socket 50 and along the core 2, thanks to a screen formed by the external conductive layer 53 of the socket 50 and the conductive coating 10 of the core 2.
  • the field lines pass through the core 2 and flourish in the oil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Insulators (AREA)
  • Cable Accessories (AREA)
EP91401065A 1990-04-26 1991-04-23 Wanddurchführung für ein elektrisches Kabel Withdrawn EP0455538A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005314A FR2661546A1 (fr) 1990-04-26 1990-04-26 Traversee de paroi pour un cable electrique.
FR9005314 1990-04-26

Publications (1)

Publication Number Publication Date
EP0455538A1 true EP0455538A1 (de) 1991-11-06

Family

ID=9396107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401065A Withdrawn EP0455538A1 (de) 1990-04-26 1991-04-23 Wanddurchführung für ein elektrisches Kabel

Country Status (5)

Country Link
EP (1) EP0455538A1 (de)
AU (1) AU7522491A (de)
BR (1) BR9101827A (de)
CA (1) CA2041022A1 (de)
FR (1) FR2661546A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2729785A1 (fr) * 1995-01-24 1996-07-26 Gec Alsthom T & D Sa Traversee isolante
RU2190276C2 (ru) * 2000-10-30 2002-09-27 Открытое акционерное общество "Свердловский завод трансформаторов тока" Разделительный высоковольтный трансформатор
FR2850202A1 (fr) * 2003-01-22 2004-07-23 Transfix Toulon Soc Nouv Traversee electrique perfectionnee pour appareil moyenne tension
CN106384653A (zh) * 2016-11-02 2017-02-08 中国电力科学研究院 直出式出线装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155846A (en) * 1938-01-27 1939-04-25 Ohio Brass Co Insulator
US3230301A (en) * 1963-07-12 1966-01-18 Westinghouse Electric Corp Externally threaded resin terminal bushing having a floating ground shield
FR2530067A1 (fr) * 1982-07-07 1984-01-13 Bignolles Yves Piece d'isolement pour borne de transformateur moyenne tension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155846A (en) * 1938-01-27 1939-04-25 Ohio Brass Co Insulator
US3230301A (en) * 1963-07-12 1966-01-18 Westinghouse Electric Corp Externally threaded resin terminal bushing having a floating ground shield
FR2530067A1 (fr) * 1982-07-07 1984-01-13 Bignolles Yves Piece d'isolement pour borne de transformateur moyenne tension

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2729785A1 (fr) * 1995-01-24 1996-07-26 Gec Alsthom T & D Sa Traversee isolante
RU2190276C2 (ru) * 2000-10-30 2002-09-27 Открытое акционерное общество "Свердловский завод трансформаторов тока" Разделительный высоковольтный трансформатор
FR2850202A1 (fr) * 2003-01-22 2004-07-23 Transfix Toulon Soc Nouv Traversee electrique perfectionnee pour appareil moyenne tension
WO2004068637A3 (fr) * 2003-01-22 2005-01-06 Transfix Toulon Soc Nouv Traversee electrique comportant une partie superieure formant appendice incline et procede de fabrication
CN106384653A (zh) * 2016-11-02 2017-02-08 中国电力科学研究院 直出式出线装置

Also Published As

Publication number Publication date
AU7522491A (en) 1991-11-07
BR9101827A (pt) 1991-12-17
FR2661546A1 (fr) 1991-10-31
CA2041022A1 (en) 1991-10-27

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