[go: up one dir, main page]

WO1994005064A1 - Connexion pour cables electriques - Google Patents

Connexion pour cables electriques Download PDF

Info

Publication number
WO1994005064A1
WO1994005064A1 PCT/GB1993/001604 GB9301604W WO9405064A1 WO 1994005064 A1 WO1994005064 A1 WO 1994005064A1 GB 9301604 W GB9301604 W GB 9301604W WO 9405064 A1 WO9405064 A1 WO 9405064A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
cables
joint according
insulation
tubular
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.)
Ceased
Application number
PCT/GB1993/001604
Other languages
English (en)
Inventor
Peter Ronald Gilbert
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to AU47183/93A priority Critical patent/AU4718393A/en
Publication of WO1994005064A1 publication Critical patent/WO1994005064A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H02G15/10—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

  • This invention relates to methods of forming joints between electric power cables and to joints between such cables, more especially such cables designed for use at medium and high operating voltages, that is to say operating voltages above 600 volts.
  • a known method of forming a joint between insulated conductors of two electric power cables comprises the steps of: electrically connecting the ends of the conductors of the cables; surrounding the ends of the connected conductors with a sleeve of solid electrically insulating material having along its internal surface an insert of a material which is substantially more electrically conductive than the material of the sleeve, so that the insert is in electrical contact with the connected conductors and the ends of the sleeve project over the cable conductor insulation to provide an annular gap therebetween; and introducing to the joint a material in a sufficiently fluid state to penetrate and fill the annular gap between the sleeve and cable insulation.
  • Such a method of jointing forms the subject of United Kingdom Patent No. GB 2211386B.
  • This method of jointing has the advantage that it can be used with cables of different cross-sectional sizes and shapes, and different types of cable insulation. It is also extremely tolerant of localised depressions, flats, scores or other imperfections in the cable insulation. However, in the particular form described by way of example in GB 2211386B this method of jointing is not convenient for use with higher voltage cables of the kind incorporating insulation screens, that is cables having a layer of electrically conducting material in intimate contact with the cable insulation, all along the length of the cable.
  • a method of forming a joint between insulated conductors of two electric power cables incorporating insulation screens comprises the steps of: electrically connecting the ends of the conductors of the cables; surrounding the ends of the connected conductors with a sleeve of solid electrically insulating material having along its internal surface an insert of a material which is substantially more electrically conductive than the material of the sleeve, so that the insert is in electrical contact with the connected conductors and the ends of the sleeve project over the cable insulation to provide an annular gap therebetween; providing a tubular electrically conducting surface between the insulation screens of the cables and surrounding the sleeve; and introducing to the joint a material in a sufficiently fluid state to penetrate and fill the annular gap between the sleeve and cable insulation; characterised in that material between the sleeve and the cables provides respective tubular paths each extending between a respective end of said insert and the corresponding end of said tubular conducting surface, and having an impedance which reduces
  • the invention also provides a joint between insulated conductors of two electric cables incorporating insulation screens comprising: means electrically connecting the ends of the conductors of the two cables; a sleeve surrounding the ends of the connected cables and having ends projecting over the cable insulation to define at each end, with the cable insulation, an annular gap; an internal insert in the sleeve in electric contact with the connected conductors; material filling the annular gaps between the sleeve and the cable insulation, said insert being substantially more electrically conductive than the material of said sleeve and said material filling the annular gaps; and a tubular electrically conducting surface extending around the outside of said sleeve between the insulation screens of the cables; characterised in that material between said sleeve and the cables provides respective tubular paths each extending between a respective end of said insert and the corresponding end of said tubular conductive surface and having an impedance which reduces with increasing electrical stress.
  • the sleeve preferably projects at each end over the end of the insulation screen of the adjacent cable.
  • the paths of electrical stress dependent impedance are provided by a layer of material on the inner surface of said sleeve.
  • the paths of electrical stress dependent impedance are provided by said material filling said annular gaps.
  • the joint is between two lengths of cable 1 each having a central core of electrical conductors 3 provided with a sheath of insulating material 5 which, in turn, is provided with an external electrically conducting screen 7.
  • the housing includes a rigid sleeve 11 of a high grade insulating polymer, such as polyethylene or ethylene propylene rubber, co-extruded with an external electrically conducting sheath 13 consisting, for example, of a polymer, such as carbon-loaded ethylene propylene rubber, and with an internal coating 15 of a material with electrical stress dependent impedance properties, such as polychloroprene loaded with silicon carbide particles and carbon.
  • a rigid sleeve 11 of a high grade insulating polymer such as polyethylene or ethylene propylene rubber
  • an external electrically conducting sheath 13 consisting, for example, of a polymer, such as carbon-loaded ethylene propylene rubber
  • an internal coating 15 of a material with electrical stress dependent impedance properties, such as polychloroprene loaded with silicon carbide particles and carbon.
  • the sleeve 11 is threaded onto one of the cables 1 prior to joining the ends of the cable conductors 3, and then positioned centrally around the connector 9 with an annular gap 17 between each end of the sleeve 11 and the insulating sheath 5 of the adjacent cable 1.
  • the sleeve 11 is sufficiently long for its ends to extend over the ends of the screens 7 of the cables 1.
  • a tubular, resilient electrically conducting insert 19 suitably moulded from carbon-loaded nitryl rubber.
  • the insert 19 is appreciably shorter than the sleeve 11, typically about one third of its length, and is fixed to the coating 15, prior to the sleeve 11 being threaded onto one of the cables 1, using an electrically conductive adhesive such as carbon-loaded epoxy resin.
  • the insert 19 is provided internally with integral radially extending projections 21 which establish electrical contact with the connector 9 when the sleeve 11 is moved axially into the desired position.
  • the joint housing is completed by conical end caps 23 of a resilient electrically conducting polymer material such as carbon-loaded nitryl rubber.
  • the end caps 23 Prior to joining the ends of the cable conductors 3 with connector 9 the end caps 23 are each threaded on to a respective one of the two cables 1. After the cable conductors 3 are joined the end caps 23 are push-fitted onto respective ends of the sleeve 11.
  • Each of the end caps 23 has at its wider inner end two circular flanges 25 and 27 of different radius which by reason of the resilience of the material of the end caps 23 respectively make electrical contact with the external sheath 13 and internal coating 15 on the sleeve 11.
  • each of the end caps 23 has a flange 29 which makes electrical contact with the screen 7 of the adjacent one of the cables 1.
  • a hardenable electrically insulating material (not shown) is then introduced in a fluid form to the interior of the housing, to fill the space therein not occupied by the cables 1 and the connector 9, and is allowed to harden.
  • a low viscosity resin such as silicone rubber is suitably used.
  • the material is suitably introduced by low pressure injection through a nozzle 31 in one of the end caps 23 until the space within the housing is completely filled, as indicated by the passage of material through the nozzle 33 in the other end cap 23.
  • the presence of the internal coating 15 on the sleeve 11, more particular the electrical stress dependent electrical impedance property of the coating 15, serves to distribute these electrical stresses uniformly along the lengths of the interfaces 35, 37 to avoid excessive electrical stress at the extremities of these interfaces 35, 37 which are liable to occur in the absence of the coating 15. It will be appreciated that such excessive electrical stress could give rise to electrical activity at the interfaces 35, 37, causing creation of voids, conductive paths and other progressive deterioration leading eventually to electrical failure of the joint.
  • a further advantage of the presence of the coating 15 and its connection, at its outer ends, to the end caps 23 is that the cable sheaths 7 can extend through the end caps 23 and terminate within the sleeve where the coating 15 provides stress control. Without the coating 15 it would be necessary to terminate the sheaths 7 at the other ends of the end caps 23, where the caps 23 contact the sheaths 7, and to geometrically taper the end caps 23 to achieve stress control at the terminations of the sheaths 7. Because it is not necessary to geometrically taper the ends of the housing, the housing can be manufactured by cost effective methods e.g. extrusion instead of moulding.
  • the required tubular paths of electric stress dependent impedance material instead of being provided by an internal coating on the sleeve 11, are provided by the material injected into the housing.
  • the injected material may be compounded with an additive of silicon carbide particles and carbon particles.
  • the present invention is applicable to joints between more than two cables i.e. to branch connections, as well as to simple straight connections between two cables, as described above by way of example.
  • the present invention is applicable to joints and methods of forming joints between cables including outer protective armouring and/or corrosion protection. Since in joints and methods of forming joints in accordance with the invention the housing provides an electrically conducting, normally grounded, surface completely surrounding the joint, the reinstatement of such armouring and/or corrosion protection around the housing can be effected without interfering with the correct electrostatic operation of the joint. For the same reason the invention is also applicable to multicore cables as well as single core cables.
  • the fluid material injected into the housing is a hardenable material
  • a material which cures to a jelly like state rather than hardens can be used.

Landscapes

  • Cable Accessories (AREA)

Abstract

L'invention concerne un procédé pour réaliser une connexion entre les conducteurs isolés (3) de deux câbles électriques (1), possédant des blindages d'isolation (7), dans lequel, après avoir connecté électriquement les extrémités des conducteurs des câbles, celles-ci sont entourées par un manchon (11) constitué d'un matériau solide isolant électrique, possédant le long de sa face intérieure un insert (19) constitué d'un matériau substantiellement plus conducteur électriquement que le manchon et faisant contact avec les conducteurs connectés. Le manchon est positionné de sorte que ses extrémités recouvrent l'isolation (5) des câbles, créant un espace libre annulaire (17) entre le manchon (11) et l'isolation, et les blindages d'isolation des câbles sont reliés par une face annulaire électriquement conductrice (13, 23) entourant le manchon. La liaison est achevée en introduisant dans la connexion un matériau dans un état suffisamment fluide pour pénétrer et remplir l'espace annulaire entre le manchon et l'isolation des câbles. Le matériau entre le manchon et les câbles constitue des circuits tubulaires (15) respectifs s'étendant chacun entre l'extémité respective de l'insert et l'extrémité correspondante de la face annulaire qui relie les blindages d'isolation des câbles et ces cricuits ont une impédance qui diminue avec l'augmentation de la contrainte électrique. Le procédé a l'avantage de pouvoir être utilsé avec des câbles de différentes sections transversales et formes et avec différents types d'isolation de câble. Il s'adapte facilement aux creux, aux plats, auc éraflures et autres imperfections locales de l'isolation des câbles.
PCT/GB1993/001604 1992-08-12 1993-07-29 Connexion pour cables electriques Ceased WO1994005064A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47183/93A AU4718393A (en) 1992-08-12 1993-07-29 Electric power cable jointing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9217088.5 1992-08-12
GB9217088A GB2269712B (en) 1992-08-12 1992-08-12 Electric power cable jointing

Publications (1)

Publication Number Publication Date
WO1994005064A1 true WO1994005064A1 (fr) 1994-03-03

Family

ID=10720213

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001604 Ceased WO1994005064A1 (fr) 1992-08-12 1993-07-29 Connexion pour cables electriques

Country Status (3)

Country Link
AU (1) AU4718393A (fr)
GB (1) GB2269712B (fr)
WO (1) WO1994005064A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683557A1 (fr) * 1994-05-19 1995-11-22 PIRELLI CAVI S.p.A. Procédé de fabrication de manchons en elastomère pour recouvrir des connections de câbles électriques et un tel manchon

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9414039D0 (en) * 1994-07-11 1994-09-28 Raychem Ltd Electrical interconnection
GB9414038D0 (en) * 1994-07-11 1994-08-31 Raychem Ltd Electrical interconnection
GB9423998D0 (en) * 1994-11-28 1995-01-11 Raychem Sa Nv Cable joint
DE19512922A1 (de) * 1995-03-30 1996-10-02 Siemens Ag Verfahren zur Herstellung einer Verbindungsmuffe für Hochspannungskabel
CN106961089B (zh) * 2017-03-20 2019-01-15 江苏安靠智能输电工程科技股份有限公司 一种高压电缆中间接头防水防爆灭火保护壳
JP2019041465A (ja) * 2017-08-23 2019-03-14 住友電気工業株式会社 電力ケーブルの中間接続構造、電力ケーブル線路、及び保護管

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2111769A (en) * 1978-09-14 1983-07-06 Raychem Ltd Enclosure for cable termination or joint
GB2211368A (en) * 1987-12-17 1989-06-28 Ass Elect Ind Power cable jointing method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573210A (en) * 1966-12-08 1971-03-30 Furukawa Electric Co Ltd Electric insulating composition containing an organic semiconducting material
US3816639A (en) * 1973-05-14 1974-06-11 Gen Electric High voltage cable splice with graded insulation and method of making same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2111769A (en) * 1978-09-14 1983-07-06 Raychem Ltd Enclosure for cable termination or joint
GB2211368A (en) * 1987-12-17 1989-06-28 Ass Elect Ind Power cable jointing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683557A1 (fr) * 1994-05-19 1995-11-22 PIRELLI CAVI S.p.A. Procédé de fabrication de manchons en elastomère pour recouvrir des connections de câbles électriques et un tel manchon
US5985062A (en) * 1994-05-19 1999-11-16 Pirelli Cavi S.P.A. Production process for elastomer sleeves for covering electric cable joints and associated sleeve

Also Published As

Publication number Publication date
AU4718393A (en) 1994-03-15
GB2269712B (en) 1996-05-01
GB9217088D0 (en) 1992-09-23
GB2269712A (en) 1994-02-16

Similar Documents

Publication Publication Date Title
US2967901A (en) Construction of joints and sealing ends of high tension electric cables
US4390745A (en) Enclosures for electrical apparatus, cable and enclosure combinations, and kits and methods for their construction
AU735377B2 (en) Dry termination for an electric cable
US4714438A (en) Electric cable joints
AU2009200542B2 (en) Apparatus for a Junction Point Between Two Electrical High-Voltage Cables
US4238639A (en) Joint for low and medium voltage electric cables
EP0084264B1 (fr) Corps moulé d'épissure haute tension
US2967899A (en) Stop joints and feeding joints for singlecore oil-filled electric cables
WO1994005064A1 (fr) Connexion pour cables electriques
GB2042818A (en) Enclosed for electrical apparatus
US4667063A (en) Electrical cable having at least its leading end partially prepared for jointing prior to laying
WO1999021259A1 (fr) Epissure perfectionnee de branchement moyenne tension, et procede associe
US4403109A (en) Control element for high-voltage apparatus and method for the manufacture of a control element
US11502499B2 (en) Coupling sleeve
GB2288696A (en) Cable splice or termination
EP0321263B1 (fr) Jonction de câbles d'énergie
US2925459A (en) Branch joint for electric cables
EP0226393A2 (fr) Jonctions de câbles électriques
US4375577A (en) Stop joint assembly for pressurized laminar dielectric cable
CN1279828A (zh) 电缆接头及其制造方法
EP0039161A1 (fr) Connexion pour câbles à plusieurs conducteurs à moyenne tension
US4446331A (en) Power cable joint structure including a reinforcement insulator containing electrode spherical bodies
GB2263589A (en) Cable joints
US20240192251A1 (en) Testing Assisting Device And Method Of Providing A Testing Assisting Device
GB2110888A (en) Oil filled electric cable system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR BY CA CH CZ DE DK ES FI GB HU JP KP KR KZ LK LU MG MN MW NL NO NZ PL PT RO RU SD SE SK UA US VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA