EP0991083A1 - Multifunktionelle einstückige elektrische Verbindung, mit einer Durchführung und eine flexibelen Leitung - Google Patents

Multifunktionelle einstückige elektrische Verbindung, mit einer Durchführung und eine flexibelen Leitung Download PDF

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Publication number
EP0991083A1
EP0991083A1 EP99410116A EP99410116A EP0991083A1 EP 0991083 A1 EP0991083 A1 EP 0991083A1 EP 99410116 A EP99410116 A EP 99410116A EP 99410116 A EP99410116 A EP 99410116A EP 0991083 A1 EP0991083 A1 EP 0991083A1
Authority
EP
European Patent Office
Prior art keywords
tank
core
electrical connection
connection
connection according
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Withdrawn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
EP99410116A
Other languages
English (en)
French (fr)
Inventor
Jean-Pierre Kersusan
Maurice Perrin
Victor Pennucci
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP0991083A1 publication Critical patent/EP0991083A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0063—Ignition cables

Definitions

  • the invention relates to an electrical connection intended for the transport of electrical energy. between a high-voltage switchgear placed inside a protective tank containing a liquid or gaseous dielectric, and an electrical installation outside the tank.
  • An objective of the present invention is to provide an electrical connection reducing the risk of failure at the interface between the bushing and the external cable of connection. Another objective is to reduce the number of connection interfaces in a high voltage installation comprising an apparatus confined in a tank. Another objective is to facilitate the electrical connection of a confined high voltage switchgear in a tank. Another objective is to reduce the overall size of a electrical connection of a high voltage switchgear confined in a tank.
  • This link constitutes a multifunctional device making it possible to group two elements usually separate, namely an insulated cable and a bushing, and thus eliminating the expensive and bulky connection device usually connecting the cable to the bushing.
  • the dimensional and mechanical characteristics of the electric wire flexible are such that it is able to flex in at least one reference plane of at least minus 90 ° on either side of a median reference position.
  • We get such flexibility for example by reducing the section of the individual metallic wires of the core, and / or by choosing a braiding or stranding mode allowing great flexibility of the core, and / or by using an elastomeric material of high elasticity.
  • This flexibility gives great freedom of positioning of the tank during assembly in relation to its environment. Of course, it is even more advantageous to allow a bending on the order of 180 °.
  • the insulating sheath of the flexible electric wire is molded on the part of the soul it envelops.
  • the molding allows, better than extrusion, to control the interface between the deformable conductor and the sheath. Indeed, it is essential to limit as much as possible the presence of bubbles in the sheath, because these defects, in the presence of fields on the one hand generate a phenomenon of partial discharges detrimental to the durability of a good insulation, and on the other hand constitute zones of weakness because reducing the thickness of the insulating medium.
  • the part of the core included in the flexible electric wire comprises a braid made up of several strands of metallic wire interlaced or crossed relatively flat like a mat, which gives the electric wire much more flexibility than that of single-wire or stranded cables of equivalent linear resistance.
  • stranded or single-wire cables may offer an alternative.
  • the part of the core included in the flexible electric wire comprises a coating of elastomer loaded with conductive particles, coating the conductor (s) deformable.
  • the interface between metal and elastomer is thus made over a thickness of elastomer brought to the potential of the metal.
  • This arrangement eliminates the disadvantage of bubbles or delamination on the surface of the metal since these singularities are found in a medium of constant potential.
  • the coating layer eliminates the effects of tips of the strands projecting radially out of the metallic part of the core, which is particularly useful when it consists of a braid. Indeed, it is in practice difficult to give a metallic braid a regular external surface. Some strands metal therefore risk entering the elastomeric material of the insulating jacket.
  • the conductive coating makes it possible to smooth the equipotentials of the electric field in the vicinity of irregularities in the surface of the braid.
  • the conductive coating may consist of a silicone substrate loaded with black conductive carbon.
  • the connection comprises an external shielding, comprising at least one film comprising an elastomer loaded with conductive particles or a tubular braid or a sheath overmolded with elastomer loaded with conductive particles or a combination of previous.
  • the shielding firstly ensures the regularity of the equipotential surfaces, and consequently that of the electric field existing in the insulating material confined between the core and the shield. Vis-à-vis the external environment, it also allows the control of the field whose value becomes negligible. We can also make sure that the shielding also allows earth fault currents to flow.
  • the surface conductance of the necessary shielding is then chosen according to the geometry the device and the expected level of leakage current, which itself depends on the type of network distribution and in particular the neutral regime.
  • connection interface comprises an insulating envelope in the same elastomeric material as the envelope coating the core, which allows molding the electrical wire of the connection interface simultaneously or sequentially.
  • connection interface constitutes the end of the connection intended to be inside the tank and comprises a connection sleeve of a terminal of a fuse, able to deform elastically so as to envelop the terminal of the fuse and to ensure sealing and electrical insulation between the fuse terminal and the interior of the tank.
  • the envelope is made of an elastomeric material molded on the core. There is then has perfect continuity of the insulation between the two ends of the connection. This provision further makes possible, if necessary, a molding in a single injection. Alternatively, it may be preferable to provide different elastomers for different parts of the casing or use another type of insulating material for a part at less of the envelope, especially for the crossing.
  • a medium voltage electrical panel 1 confined in a enclosure 2 filled with a gaseous dielectric, in this case sulfur hexafluoride, has feeders 3 delivering network current to electrical equipment 4 constituting a charge.
  • This apparatus 4 comprises a transformer 5 medium voltage / three-phase low voltage, and a protection device comprising a three-phase circuit breaker 6 and fuses 10, connected upstream of the primary windings of the transformer 5.
  • the circuit breaker 6 is intended for protection against electrical faults inducing only low overcurrents at the primary level, in particular faults appearing on the secondary windings.
  • Each fuse 10 is connected in series between the network and the circuit breaker, and selectively sensitive to short circuits affecting the windings transformer primary 5.
  • Each fuse 10 comprises, conventionally, two end terminals 11, 12 metallic elements connected by a fusible element 13 contained in a cylindrical body 14 comprising a solid dielectric material.
  • the electrical equipment 4 is confined in a tank 9 making up a sealed enclosure filled with a dielectric fluid 16, in this case oil.
  • An electrical connection 20 is intended for the electrical supply of the primary windings of the transformer and connected on the one hand to the network at feeder level 3, and on the other hand to the apparatus 4.
  • This electrical connection comprises an external connection 21 intended for the connection with the network, a middle part constituting a flexible electric wire 22, a bushing 23 ensuring sealing at an orifice in a wall of the tank 9, and an internal connection 24, into which the terminal 11 of the fuse 10 is connected.
  • the electrical connection 20 comprises a core 25 conducting electricity, covered by an envelope 26 of good insulating elastomeric material.
  • the core 25 has in its part middle braid 27 made up of metal strands and, at each end, a pin 28, 29 crimped on the braid 27.
  • the core 25 further comprises a conductive coating 30 coating the metal braid 27.
  • the coating layer 30 makes it possible to eliminate the effects of tips of the strands projecting radially out of the braid 27 and smoothing the surfaces equipotential in the vicinity of irregularities in the surface of the braid.
  • the conductive coating 30 consists of a silicone substrate loaded with particles of conductive carbon.
  • the casing 26 is, in this embodiment, constituted by a vulcanizable silicone cold of generally cylindrical shape, which also constitutes the body of the bushing and network side and load side connections.
  • the casing 26 is covered with shielding consisting of a conductive film 31 which is brought to ground potential.
  • the diameter of the braid is of the order of 8 mm, for an outside diameter of the cable of the order of 30 mm.
  • the cable of the connection 20 is capable of bending by a large angle, in this case 180 ° at the less.
  • the bushing 23 and the internal connection 24 are, in this embodiment, nested one in the other.
  • the bushing 23 includes a fixing flange 32 which is fixed on the wall of the tank 9 by means of fixing screws 33.
  • a protective cover 41 protects a current transformer 42 delivering a signal representative of the intensity of the current passing through the connection 20.
  • the internal connection 24 comprises a sheath 34 of which a part 35 is shaped in a cup taking approximately the shapes of the line side fuse terminal, with a cylindrical wall and a flat bottom on which is flush the end of the load-side pin 29 of the conductive core of the link 20. This cup 35 extends into a cylindrical lip 36 of slightly smaller diameter so as to this conform to the body 14 of the fuse.
  • the internal walls of the cup 35 are covered of a conductive film, so that they are at the potential of the load side pin 29 of blade.
  • the peripheral lip 36 of the connection cooperates with the cylindrical body 14 of the fuse and undergoes a deformation elastic which ensures sufficient contact pressure with the fuse body, so that a tight seal is formed between the interior of the cup 35 and the middle outside immersed in the fluid dielectric of the tank 9.
  • the external connection 21 comprises a cup-shaped cavity 37, from the bottom of which protrudes the end of the spindle on the network side 28.
  • the outer periphery of the connection 21 has a frustoconical wall 38 forming a guide surface and sealing dielectric, as well as a support collar 39 for a fixing flange 40.
  • This connection 21 is intended to be connected to a clamp 43 of the start 3 of the medium voltage table 1.
  • the multifunctional electrical connection is made by placing the core of the connection, slightly stressed in tension by its ends, then by injecting the silicone cold with a slight overpressure, by heads distributed in a ring around the core.
  • the outer cylindrical wall of the sheath is covered with a film conductor in silicone charged with carbon particles, by spraying paint. Of even, a film of paint is deposited on the inner surface of the cup of the side socket charge.
  • FIG. 3 a second embodiment of the invention is shown.
  • This second embodiment is distinguished from the first by the presence of a rigid elbow conductor section 44, the ends of which are oriented 90 ° from each other.
  • This arrangement further reduces the overall size of the link in service, at the cost of degrading freedom of positioning. She constitutes an advantageous compromise, when freedom of positioning is not desired only in the plane of Figure 3 and not out of this plane.
  • the invention is subject to various variations.
  • it can be advantageous to use different materials for the different parts of the connection, depending on the mechanical characteristics sought. More specifically, it is possible to form the body of the crossing in a very rigid material and make the material adhere to it elastomer of the load side plug and that of the flexible electric wire. he is also it is possible to use different elastomers for the load and wire side grip.
  • the elastomers taken into account are not only the vulcanizable silicones to cold: other classes of silicone, in particular hot vulcanizable silicones, can be used. Finally, other elastomeric materials are also possible.
  • the external shielding may include a metallic tubular braid.
  • the metallic braid of the core may be a relatively flat braid or, more generally, not cylindrical. In this case, the mechanical characteristics in bending are not isotropic.
  • the tank contains oil.
  • the invention is also applicable to devices bathed in other dielectrics liquid or gaseous, especially in sulfur hexafluoride.
  • the exemplary embodiments relate to medium voltage which, within the meaning of this demand, is part of high voltage.
  • the invention can also be applied above 56kV.
  • the electrical equipment inside the tank can indifferently be a load or a source of electrical power.

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  • Installation Of Bus-Bars (AREA)
EP99410116A 1998-10-01 1999-09-22 Multifunktionelle einstückige elektrische Verbindung, mit einer Durchführung und eine flexibelen Leitung Withdrawn EP0991083A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9812518A FR2784246B1 (fr) 1998-10-01 1998-10-01 Liaison electrique haute tension multifonctionnelle monobloc, comportant une traversee et un fil electrique flexible
FR9812518 1998-10-01

Publications (1)

Publication Number Publication Date
EP0991083A1 true EP0991083A1 (de) 2000-04-05

Family

ID=9531262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99410116A Withdrawn EP0991083A1 (de) 1998-10-01 1999-09-22 Multifunktionelle einstückige elektrische Verbindung, mit einer Durchführung und eine flexibelen Leitung

Country Status (2)

Country Link
EP (1) EP0991083A1 (de)
FR (1) FR2784246B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2323139A3 (de) * 2009-11-16 2011-12-28 Top 1 Green Development Co., Ltd. Zündkabel, das negative magnetische induktive Impedanz eliminiert
EP2763251A1 (de) * 2013-01-30 2014-08-06 E & A Elektrotechnik & Automatisierung GmbH Silikon isolierter und biegesteifer Vorrichtung zum Leiten von elektrischem Strom

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790053A (en) * 1951-12-27 1957-04-23 Thomas F Peterson Shielded ignition cable and resistors
GB1025686A (en) * 1962-01-25 1966-04-14 Asea Ab Pothead for connecting oil-filled cables to transformers and other electrical apparatus
EP0110008A2 (de) * 1982-12-01 1984-06-13 Felten & Guilleaume Energietechnik AG Sicherungsanschlusseinrichtung für gekapselte Mittelspannungsschaltanlagen
US4721474A (en) * 1985-09-11 1988-01-26 Yazaki Corporation High tension feeding cable and a method of manufacturing the same
US5625168A (en) * 1994-12-13 1997-04-29 Precision Engine Controls Corporation Secondary ignition lead structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790053A (en) * 1951-12-27 1957-04-23 Thomas F Peterson Shielded ignition cable and resistors
GB1025686A (en) * 1962-01-25 1966-04-14 Asea Ab Pothead for connecting oil-filled cables to transformers and other electrical apparatus
EP0110008A2 (de) * 1982-12-01 1984-06-13 Felten & Guilleaume Energietechnik AG Sicherungsanschlusseinrichtung für gekapselte Mittelspannungsschaltanlagen
US4721474A (en) * 1985-09-11 1988-01-26 Yazaki Corporation High tension feeding cable and a method of manufacturing the same
US5625168A (en) * 1994-12-13 1997-04-29 Precision Engine Controls Corporation Secondary ignition lead structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2323139A3 (de) * 2009-11-16 2011-12-28 Top 1 Green Development Co., Ltd. Zündkabel, das negative magnetische induktive Impedanz eliminiert
EP2763251A1 (de) * 2013-01-30 2014-08-06 E & A Elektrotechnik & Automatisierung GmbH Silikon isolierter und biegesteifer Vorrichtung zum Leiten von elektrischem Strom

Also Published As

Publication number Publication date
FR2784246B1 (fr) 2000-11-24
FR2784246A1 (fr) 2000-04-07

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