WO1996030986A1 - Procede de fabrication d'une boite de jonction pour cables a haute tension - Google Patents

Procede de fabrication d'une boite de jonction pour cables a haute tension Download PDF

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Publication number
WO1996030986A1
WO1996030986A1 PCT/DE1996/000542 DE9600542W WO9630986A1 WO 1996030986 A1 WO1996030986 A1 WO 1996030986A1 DE 9600542 W DE9600542 W DE 9600542W WO 9630986 A1 WO9630986 A1 WO 9630986A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
shielding electrode
insulating
sleeve
insulation
Prior art date
Application number
PCT/DE1996/000542
Other languages
German (de)
English (en)
Inventor
Norbert Kurda
Reinhard Schroth
Dirk Kunze
Stephan PÖHLER
Lothar Goehlich
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1996030986A1 publication Critical patent/WO1996030986A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress

Definitions

  • the invention is in the field of energy distribution and can be used in the production of connecting sleeves with which the individual lengths of plastic-insulated high-voltage cables are electrically connected to one another when a high-voltage cable system is being created.
  • Preferred areas of application are connecting sleeves for cables insulated with crosslinked polyethylene (VPE / XLPE), the transmission voltage of which is 220 kV and more.
  • the electrical field control in the end closures is carried out with the aid of prefabricated, slide-on control elements made of silicone rubber, which form a relatively small component with the corresponding design of the electrically conductive part (DE-Z "ABB technology", issue 2/1994 , Pages 13 to 19 / EP-A2-0 491 447).
  • the material for the control elements is vulcanizing, pourable, two-component silicon types of rubber (RTV-2 rubbers) into consideration (DE-Z "Kautschuk + Gummi.Kunstscher", No. 1/1986, pages 33 to 36; DE-Z "Energie animation", 1991, No. 26, pages 1535 to 1545) .
  • the actual insulating body of the sleeve is either constructed from crosslinkable polyethylene tapes (winding sleeve) or is produced using a casting mold by extrusion of a crosslinkable polyethylene (EMJ sleeve; DE 29 28 856 AI / magazine IEEE Electrical Insulation Magazine, May / June 1991, Vol. 7, No. 3, pages 31 to 33) or a sleeve consisting of prefabricated individual components (solid sleeve) is used, the insulating body of which is made of epoxy resin and contains a high-voltage electrode, with the two ends of the Insulating body made of conical high-voltage seals
  • Silicone rubber can be inserted ("ABB technology", issue 2/1994, page 17, Figure 3 with text).
  • ABB technology issue 2/1994, page 17, Figure 3 with text.
  • the cable ends, each provided with a pushed-on control element are surrounded in the area of the conductor connection point with an electrically conductive and an electrically insulating sheath in the form of a winding and overall surrounded by a dense metal housing, which with an insulating medium in the form of the insulating gas SFg is filled (DE-Al-38 22 288).
  • These known connecting sleeves usually require a relatively large volume (length, diameter) and / or are possibly relatively complex to manufacture (tempering for cross-linking the insulating body) or must be monitored during operation (filling with SFg).
  • a prefabricated sleeve body which consists of elastic material and rests on the wire insulation of the two connected cable wires.
  • the sleeve body contains an electrically conductive shielding cylinder place surrounds at a distance and makes the space inside the shielding cylinder field-free (DE-Al-16 65 222).
  • the invention is based on the object of taking measures for producing the sleeve which result in a small construction , fast and safe mountable sleeve that can also be used for transmission voltages around 400 kV.
  • a prefabricated, elastically expandable shielding electrode is used as the electrically conductive and electrically insulating sheathing of the conductor connection point, the ends of which are seated on the insulation of the two cable ends, and continue to follow when the shielding electrode is pushed onto the conductor connection point, the surface of the two field control elements, the cable insulation and the shielding electrode are coated with an adhesive and that subsequently a casting mold is arranged around the connection point thus prepared and this casting mold with an insulating, liquid-processable and cross-linkable elastomer filled in and the elastomer is crosslinked.
  • the measures provided according to the invention lead to a sleeve which is small in the axial and radial directions and whose operational reliability is achieved by using an adhesion promoter in the border area between the prefabricated parts, including the wire insulation, and by Pouring socket body manufactured on site is guaranteed.
  • silicone rubber as the material for the field control elements and the shielding electrode; Prefabricated elements made from this material can be expanded and guaranteed relatively easily a secure elastic fit.
  • a silicone rubber that crosslinks at room temperature should be used as the elastomer that can be processed in liquid form, the pot life of which is set to 1 to 5 hours by suitable additives in order to ensure that the elastomer flows into the casting mold in an amount of approximately 100 liters to enable.
  • the use of an elastomer that crosslinks at room temperature eliminates the need for external heat to crosslink the insulating material in other sleeve constructions.
  • a further reduction in the volume of the sleeve produced can be achieved if the wire insulation of the two connected cable wires in the area of the shielding electrode is reduced to a wall thickness of approximately 5 mm.
  • the outer diameter of the shielding electrode which is at high voltage potential, can be significantly reduced without leading to an electrical overloading of the sleeve body, which is also reduced in diameter.
  • the cavity-free contact of the socket body against the core insulation of the two cable ends can be done by a radial
  • a tube-like pressure sleeve made of an elastically stretchable plastic of high strength based on ethylene-propylene or on a silicone basis is suitable for this.
  • Such a pressure sleeve expediently forms the outer area of the insulating sleeve body and is pushed over the connection point before the casting mold is arranged, a tight support in the foot area of the two control elements being sought.
  • the outer diameter of the pressure sleeve is chosen to be smaller than the inner diameter of the casting mold, so that under the action of the filling pressure when the liquid elastomer is filled in, the pressure sleeve is expanded until it comes into contact with the casting mold.
  • the inner surface of the pressure sleeve can be designed with a double cone with a larger diameter towards the ends.
  • FIG. 1 shows a schematic representation of a connecting sleeve in which the insulation of the cable cores for the purpose of producing the conductor connection is offset in one step
  • FIG. 2 shows a connecting sleeve in which the insulation of the
  • Cable cores is conically reduced for the purpose of arranging a shielding electrode with the smallest possible diameter.
  • the sleeve according to Figure 1 serves to connect the two
  • Cable cores 1 and 4 which have a conductor 2 or 5 and an insulation 3 or 6. Inner and outer conductive layers associated with the cable insulation are not shown. The insulation is removed at the ends of the two cable wires in order to connect the conductors to the conductor connecting element 7.
  • a potential-controlling bridge 8 is arranged above it, which establishes an electrical connection to the shielding electrode 9, which consists of an electrically conductive part 6 and an insulating sheath 11.
  • the shielding electrode 9 is dimensioned such that its ends rest on the wire insulation 3 and 6 with elastic expansion.
  • the two control elements 12 and 15 were pushed onto the correspondingly prepared cable ends, each of which has a control deflector 13 as the conductive part, which is embedded in an insulating part 14.
  • the surfaces of these clothing parts became and the exposed wire insulation are coated with an adhesion promoter and then surrounded with a casting mold into which a liquid, crosslinkable insulating material has been filled.
  • This casting process and the crosslinking process formed the insulating body 17, to which the conductive layer 18 was subsequently applied.
  • the conductive layer 18 is usually electrically connected to the electrical shields of the cable wires to be connected. For the purpose of potential separation, this conductive layer can have an interruption 19.
  • FIG. 2 shows the connection of two high-voltage cables, only one half of the sleeve being shown.
  • Each of the two cables 20 is provided with insulation 21, which is reduced to a region 23 of small wall thickness by means of a conical step 22.
  • the shielding electrode 30 lies in the area of the reduced wall thickness on the wire insulation of the two cables.
  • Each cable is surrounded by an aluminum corrugated jacket 24, which in turn carries a plastic jacket 25.
  • a piece of pipe 27 is attached to the metal jacket, on which the foot of the respective control element 31 is seated.
  • the earth clamp 26 is also attached to the pipe section.
  • This grounding terminal 26 is provided with a connector 28 to which an earth rail 29 is attached.
  • the earth rail 29 is electrically connected at the other end of the sleeve to the metal sheath of the other cable or to an outcrossing device.
  • the insulating sleeve body 32 also bears against the earth rail 29 and is provided with an outer conductive layer (not designated in any more detail).
  • a sleeve housing 33 is also arranged around the connecting sleeve, which essentially consists of the shielding electrode 30, the control elements 31 and the insulating sleeve 32 For the purpose of moisture-proof encapsulation of the sleeve as a whole is cast with resin.
  • Control elements and shielding electrodes made of silicone rubber were used in the manufacture of the sleeve.
  • a silicone rubber vulcanizing at room temperature by addition crosslinking which was offered by the company Wacker-Silicon, was used for this purpose.

Landscapes

  • Cable Accessories (AREA)
  • Processing Of Terminals (AREA)

Abstract

Pour fabriquer une boîte de jonction compacte et d'un montage facile et sûr pour câbles à haute tension dont l'isolation est constituée de polyéthylène réticulé et qui sont conçus pour des tensions allant jusqu'à 400 kV, on monte d'abord des éléments de commande (31) préfabriqués à expansion élastique sur l'âme des câbles à raccorder; on place une électrode de protection (30) sur le point de raccordement des conducteurs; ensuite, la surface des composants de commande, de l'électrode de commande et des isolants (21) de conducteurs situés entre eux est enduite d'un agent adhésif, après quoi un élastomère isolant (32) vient envelopper ce montage et est réticulé. Les isolants de conducteurs dans la zone (23) de l'électrode de protection (30) sont de préférence réduits à une épaisseur de paroi d'environ 5 mm.
PCT/DE1996/000542 1995-03-30 1996-03-19 Procede de fabrication d'une boite de jonction pour cables a haute tension WO1996030986A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995112922 DE19512922A1 (de) 1995-03-30 1995-03-30 Verfahren zur Herstellung einer Verbindungsmuffe für Hochspannungskabel
DE19512922.9 1995-03-30

Publications (1)

Publication Number Publication Date
WO1996030986A1 true WO1996030986A1 (fr) 1996-10-03

Family

ID=7758956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000542 WO1996030986A1 (fr) 1995-03-30 1996-03-19 Procede de fabrication d'une boite de jonction pour cables a haute tension

Country Status (2)

Country Link
DE (1) DE19512922A1 (fr)
WO (1) WO1996030986A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041081A1 (de) * 1980-10-29 1982-06-03 Siemens AG, 1000 Berlin und 8000 München Verbindungsmuffe fuer isolierte elektrische leiter
FR2498022A1 (fr) * 1981-01-09 1982-07-16 Silec Liaisons Elec Procede et equipement de realisation de jonctions de conducteurs electriques a isolant sec pour tensions elevees
DE3822288A1 (de) * 1988-07-01 1990-01-04 Felten & Guilleaume Energie Verbindungsmuffe fuer vpe-isolierte hoechstspannungskabel
GB2269712A (en) * 1992-08-12 1994-02-16 Ass Elect Ind Stress-reduction in power cable joint.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726402C3 (de) * 1977-06-09 1984-03-15 Siemens AG, 1000 Berlin und 8000 München Verbindungsmuffe für geschirmte Starkstromkabel
DE3016585C2 (de) * 1980-04-30 1985-01-10 Minnesota Mining And Manufacturing Co., Saint Paul, Minn. Kabelverbindung für Mittelspannungs-Kabel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041081A1 (de) * 1980-10-29 1982-06-03 Siemens AG, 1000 Berlin und 8000 München Verbindungsmuffe fuer isolierte elektrische leiter
FR2498022A1 (fr) * 1981-01-09 1982-07-16 Silec Liaisons Elec Procede et equipement de realisation de jonctions de conducteurs electriques a isolant sec pour tensions elevees
DE3822288A1 (de) * 1988-07-01 1990-01-04 Felten & Guilleaume Energie Verbindungsmuffe fuer vpe-isolierte hoechstspannungskabel
GB2269712A (en) * 1992-08-12 1994-02-16 Ass Elect Ind Stress-reduction in power cable joint.

Also Published As

Publication number Publication date
DE19512922A1 (de) 1996-10-02

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