Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/46—Bases; Cases
  • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
• • 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 invention relates to an electrical connection device with fluid insulator making it possible to connect a high-voltage electrical cable to a post in a metal casing or to an external post
• An electrical connection device for a post is known from document EP-A-148 394 in a metallic envelope with a fluid insulator such as sulfur hexafluoride in gaseous form
• the electrical connection device described in this document comprises a conductive connection bar disposed inside the enclosure and having one end fixed in a sealed manner to an insulating resin sleeve sealingly passing through a wall of the enclosure containing the insulating gas
• the connecting bar extends outside the enclosure and is connected to a plug-in connection member disposed in the part of the sleeve extending outside the enclosure and surrounded by a conductive screen forming a Faraday cage around the plug connection member hable
• an electrical connection device is the seat of significant electrical stresses when it is used at very high voltage.
• this device since this device is not provided with any electric field distribution member, it is necessary to provide a member for reducing stresses. separate which is mounted on the electric cable before its installation, which involves delicate manipulations on site to avoid the appearance of electrical stresses at the interface between the internal surface of the insulating sleeve and the Field distribution
• an electrical connection device with fluid insulator comprising an enclosure containing a fluid insulator, a conductive connecting bar disposed inside the enclosure and having one end fixed in leaktight manner to a sleeve.
• the connecting rod being connected to a pluggable connection member surrounded by a conductive screen forming a Faraday cage around the connector body spitted ⁇ ble, wherein the pluggable connection member is disposed inside the enclosure and the insulating sleeve is made of elastomeric material and comprises a conductive deflector flush with the internal surface of the insulating sleeve at a distance from the conductive screen surrounding the plug-in connection member.
• the plug-in connection member is surrounded by the insulating fluid contained in the enclosure, which minimizes the electrical stresses in the material surrounding the plug-in connection member.
• the device according to the invention can be fully assembled and filled with fluid in the workshop so that when installing an electric cable on a site, it suffices to prepare the end of the cable and engage it in the insulating sleeve to plug in the cable conductor without breaking the sealing of the enclosure, which avoids handling of fluid on the site.
• this insulating elastomer sleeve is tightly applied to the external surface of the cable due to its elasticity and due to the pressure of the insulating fluid which surrounds it, which minimizes the risk of faults at the interface between the cable. and the insulating sleeve.
• the deflector integrated into the insulating sleeve then fully plays its role of distributing the electric field inside the insulating sleeve.
• the deflector extends astride the wall of the enclosure through which the insulating sleeve passes. This minimizes the size of the connecting device according to the invention without affecting the distribution of the electric field.
• FIG. 1 is an axial sectional view schematic of the electrical connection device according to the inven ⁇ ,
• FIG. 1 is a partial perspective view ⁇ LEMENT cutaway of another embodiment of the inven ⁇
• FIG. 2 is a partial perspective view ⁇ LEMENT cutaway of another embodiment of the inven ⁇
• FIG. 3 is a sectional view along line
• the electrical connection device is described in relation to a device of the external station type, that is to say that the enclosure is partly formed by an insulator 1, for example an insulator made of epoxy resin reinforced with fiberglass or porcelain and comprising skirts extending outwards.
• an insulator 1 for example an insulator made of epoxy resin reinforced with fiberglass or porcelain and comprising skirts extending outwards.
• the insulator 1 is fixed in a manner known per se on a support 7 by bolts 8 and is closed by a metal plate 9 fixed by screws 10 cooperating with inserts 11 embedded in the wall of the enclosure.
• the seal between the plate 9 and the side wall of the insulator is preferably provided by an O-ring not shown.
• a metal connecting bar 3 extends inside the enclosure and is fixed in a sealed manner thereto.
• the conductive connecting bar 3 comprises a collar 4 fixed by screws to a metal insert 5 embedded in the wall of the insulator.
• a metal insert 5 embedded in the wall of the insulator.
• an unshown O-ring is arranged between the flange 4 and the metal insert 5.
• the connecting rod 3 carries a connecting member 6 plugin shown schematically in the form of a lyre.
• the wall 9 of the enclosure is crossed by a sleeve made of elastomeric material 12, for example a sleeve made of silicone or EPDM, the lower end of which is sealed in an opening 13 in the plate 9.
• the sleeve of elastomer 12 is mounted in a manner sealed on the end NCI ⁇ higher of the connecting bar 3, for example by a press fit of the connecting bar 3 in the central duct 14 of elastomeric sleeve 12.
• the enclosure is filled with a fluid insulator 2 such as a gas, in particular sulfur hexafluoride, an oil or even a fat.
• a fluid insulator 2 such as a gas, in particular sulfur hexafluoride, an oil or even a fat.
• the elastomer sleeve 12 Opposite the connection member 6, the elastomer sleeve 12 includes a conductive screen 15 which surrounds the connection member.
• the conductive screen 15 is for example made of elastomer made conductive by carbon black.
• the elastomer sleeve 12 At its lower part the elastomer sleeve 12 comprises a deflector 16 which straddles the lower wall 9 of the enclosure at a distance from the conductive screen 15, the lower part of the deflector 16 flush with the internal surface of the elastomer sleeve 12 .
• an electrical cable When an electrical cable is connected, it is first of all prepared in a manner known per se by cutouts in staircases showing in order the conductor of the cable at the end thereof, the insulation of the cable and the cable shield screen.
• the end of the cable is then introduced into the conduit 14 of the elastomer sleeve 12 until the cable conductor is plugged into the plug-in connection member 6.
• the end of the cable insulation is then opposite the conductive screen 15 and the internal surface of the duct 14 is pressed against the external surface of the cable insulation while the part of the deflector 16 which is flush with the internal surface of the elastomer sleeve 12 is in contact with the cable screen.
• the sleeve 12 is preferably force-fitted or the sleeve 12 is maintained in a slightly expanded state by a removable tube engaged in the workshop in the conduit 14 and removed after the cable has been put in place.
• Figures 2 and 3 illustrate another embodiment of the invention more particularly intended for a station in a metal envelope but can also be used in an outdoor station of the type illustrated in Figure 1.
• the enclosure containing the insulating fluid is delimited by the walls or by internal partitions of the station.
• an insulating sleeve 12 is fixed as previously on a plate 9 forming a part of the wall of the enclosure and mounted for this purpose in a sealed manner on another wall portion 17 by screws 18, the sealing being ensured by a seal 19.
• the connecting bar 3 is engaged in a sealed manner in the insulating sleeve 12 and comprises at its end internal to the sleeve 12 a plug-in connection member 6.
• the other end, not shown, of the connecting bar 3 is fixed in a manner known per se to a bus extending inside the station.
• the device of this embodiment comprises an insulating reinforcement generally designated in 20 which s extends around the insulating sleeve 12.
• the frame 20 has one end fixed to the plate 9 and an opposite end supporting the connecting bar 3.
• the frame 20 comprises three insulating branches in flying buttress 21 disposed at 120 ° from one another around the axis of the sleeve 12.
• One end of each branch 21 is fixed to the plate 9 by a screw 22 engaged in an insert 23 embedded in the resin forming the branch 21.
• the other end of each branch 21 is fixed to a metal support ring 24 by a screw 25 engaged in an insert 26 embedded in the branch 21.
• the support ring 24 surrounds the connecting bar 3
• the conductive screen 15 which extends around the plug-in connection member extends outside the insulating sleeve 12 and extends at least up to the support ring 24.
• the conductive screen 15 has a rounded edge 27 and is folded over the frame as illustrated in the figures to wrap the support ring 24 and the parts metallic 26 which are associated.
• the invention is not limited to the embodiments described and it is possible to make variant embodiments without departing from the scope of the invention as defined by the claims.
• the device according to the invention can also be adapted to the application for which it is intended.
• the removal of the insulator 1 makes it possible to considerably reduce the size of the electrical connection device and, consequently, to correspondingly reduce the size of the post in the casing metallic.
• the plug-in connection member 6 has been illustrated in relation to embodiments in which the plug-in connection member 6 is fixed to the lower end of the connecting bar 3, provision may be made for make a cavity in this connecting bar and fix the plug-in connection member in the bottom of this cavity. The side wall of the cavity then plays the role of the conductive screen 15 which can be reduced. This further minimizes the size of the connecting device according to the invention.
• the plug-in connection member 6 has been illustrated in the form of a female member, it is also possible to provide a male connection member associated with the connecting rod 3 and to provide a female connection member on the cable.
• the conductive screen 15 has been shown flush with the internal surface of the insulating sleeve 12, it can also be embedded in the mass of the latter.
• the frame 20 has been illustrated in the form of three branches joined by a support ring, it is possible to provide a larger number of branches, or to produce a tubular, cylindrical or conical frame, completely enveloping the elastomer sleeve 12 and the internal face of which can be in contact with the elastomeric sleeve 12. In the latter case the reinforcement can even be used as a mold for the elastomeric sleeve 12.

Landscapes

• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Connector Housings Or Holding Contact Members (AREA)
• Insulators (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9510277

Family Applications (1)

Country Status (5)

Families Citing this family (25)

Family Cites Families (10)

• 1997
  • 1997-08-13 FR FR9710336A patent/FR2767421B1/fr not_active Expired - Fee Related
• 1998
  • 1998-08-11 DE DE69802414T patent/DE69802414T2/de not_active Expired - Lifetime
  • 1998-08-11 US US09/485,290 patent/US6309235B1/en not_active Expired - Fee Related
  • 1998-08-11 WO PCT/FR1998/001792 patent/WO1999009614A1/fr not_active Ceased
  • 1998-08-11 EP EP98942727A patent/EP1004153B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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