GB1588655A - Cable joints - Google Patents

Cable joints Download PDF

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Publication number
GB1588655A
GB1588655A GB1500978A GB1500978A GB1588655A GB 1588655 A GB1588655 A GB 1588655A GB 1500978 A GB1500978 A GB 1500978A GB 1500978 A GB1500978 A GB 1500978A GB 1588655 A GB1588655 A GB 1588655A
Authority
GB
United Kingdom
Prior art keywords
joint box
inner joint
box
conductors
filling
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.)
Expired
Application number
GB1500978A
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.)
IJZERGIETERIJ LOVINK BV
Original Assignee
IJZERGIETERIJ LOVINK BV
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 IJZERGIETERIJ LOVINK BV filed Critical IJZERGIETERIJ LOVINK BV
Publication of GB1588655A publication Critical patent/GB1588655A/en
Expired legal-status Critical Current

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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

Landscapes

  • Cable Accessories (AREA)
  • Processing Of Terminals (AREA)
  • Gas Or Oil Filled Cable Accessories (AREA)

Description

(54) CABLE JOINTS (71) We, IJZERGIETERIJ LOVINK B.V., a Dutch Company, of Lovinkweg 3, Terborg, The Netherlands, do hereby declare the invention, for which we pray that a patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a method ofjoining the ends of two high tension cables by interconnecting the respective conductors, surrounding the joint with an envelope and filling the envelope with an isulating oil.
Normally this method has been carried out by interconnecting the lead sheath of both cable ends by means of a lead envelope surrounding the interconnected conductors, and filling the envelope with a suitable insulating oil through a sealable filling aperture.
This method is time-consuming and cumbersome and requires accurate and skilled work.
Not withstanding that, leakage or distortion of the envelope occurs, necessitating a new splice.
An object of the present invention is to provide an improved cable joining method and apparatus.
According to one aspect of the invention a method of joining the ends of two high tension cables comprises interconnecting the ends of the respective conductors; surrounding the interconnected conductor ends by an insulating inner joint box extending from the sheathing of one cable end to that of the other; filling the inner joint box with an insulating fluid; surrounding the inner joint box with an outer metal joint box; and filling the space between the inner and outer joint boxes with an insulating material.
Preferably the inner joint box is fitted around the interconnected conductor ends in two parts each extending longitudinally of the conductors, and the two envelope parts are then bonded together, for example by glueing,.
at their longitudinal edges.
The two parts of the inner joint box are preferably of different lengths, and the longer part is first attached at both ends to the respective cable ends and subsequently the shorter part is bonded to the longer part. This allows proper control over the positioning of the interconnected conductor ends within the inner joint box.
Prior to the mounting of the inner joint box, at least one ring is preferably passed about each cable end, and each ring is subsequently located tightly around the inner joint box. The rings are preferably of the same material as the inner joint box. This provides a quick and reliable method of clamping the two parts of the inner joint box together whilst they are being bonded.
Preferably the conductors are located in the inner joint box by spacer elements which may be disc-shaped and which are preferably located in the joint box parts by projections within said parts.
According to another aspect of the invention, apparatus for carrying out the method comprises an inner joint box of insulating material to be located surrounding the ends of the respective cable conductors when such ends have been interconnected, the inner joint box having a closable aperture through which the box can be filled; insulating fluid for filling the inner joint box; an outer metal joint box to be positioned around the inner joint box; and an insulating material for filling the space between the joint boxes.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing, in which: Figure 1 is a longitudinal section of a cable joint made by the method according to the invention, and Figures 2, 3 and 4 are transverse sections of the cable joint taken along lines Il-Il; III-III and IV-IV, respectively, of Figure 1.
Referring to the drawing, the insulating and protecting sheathings of two cables to be joined are first removed from the cable ends 1 and 2. The lead sheathings are also removed. A cold-vulcanising, insulating tape 5 is wrapped around eåch cable end until a diameter is obtained conforming to the internal diameter of inlet apertures of a longitudinally-divided inner joint box 7 and 8 of insulating material.
After slipping two rings 9, 10 and 11, 12 about the respective cable ends, each taped cable end portion is inserted into a respective inlet aperture of the lower part 7 of the insulating inner joint box. The part 7, which is longer than the part 8, is fastened to each cable end.
The cable ends are also fastened on a lower half 15 of a longitudinally-divisible metal outer joint box 15, 16 using clamping straps 13 and 14. The metal joint box 15, 16 is large enough to contain the inner joint box 7, 8.
Conductors 17 and 18 are passed through respective apertures in repsective spacer members 19 which comprise discs which fit in the inner joint box and are provided with three such apertures symmetrically arranged.
Bare ends of the corresponding conductors of the two cables are interconnected between the spacers 19.
The upper part 8 of the inner joint box is then located on the lower part 7 after having applied some rapidly-curing polyurethane glue into V-shaped longitudinal grooves 20. The rings 9,10, and 12 are then located about the tapering inner joint box to clamp the parts 7 and 8 together. The inner joint box is then filled with oil through a filling opening, and the opening is then closed by insertion of a threaded stopper 21.
Finally, an upper part 16 of the outer joint box is fastened to the lower part 15 and the space between the metal outer joint box 15, 16 and the insulating inner joint box 7, 8 is filled with a liquid polyurethane resin. After curing, this material has substantially the same characteristics as the inner joint box material as regards effect upon electric field, so that the electric field produced round the cables when they are energised is substantially undisturbed by the presence of the filler material.
The spacers 19 are made of the same material as the inner joint box, or of another material as the inner joint box, or of another material having substantially the same characteristics as regards effect upon the electric field. The spacers are retained in the inner joint box by projections 22 formed on the inner surface of the box. The projections are arranged in groups lying in two planes transverse to the length of the inner joint box.
Such projections must not be located at the uppermost parts of the inner joint box, i.e. in line with the filling aperture of the inner joint box.
It will be apparent that, by using the above method, a hermetically-sealed resin envelope is arranged within a metal outer joint box, the internal volume being filled with insulating oil which envelopes the conductors. The resin filling of the outer joint box tenaceously adheres to the sheathing and to the inner joint box, so that internal pressure or internal vacuum will not give rise to leaks or implosions.
WHAT WE CLAIM IS: 1. A method ofjoining the ends of two high tension cables, comprising interconnecting the ends of the repsective conductors; surrounding the interconnected conductor ends by an insulating inner joint box extending from the sheathing of one cable end to that of the other; filling the inner joint box with an insulating fluid; surrounding the inner joint box with an outer metal joint box; and filling the space betweent the inner and outer joint boxes with an insulating material.
2. A method as claimed in Claim 1, wherein the inner joint box is fitted around the interconnected conductor ends in two parts each extending longitudinally of the conductors, and the two envelope parts are bonded together at their longitudinal edges.
3. A method as claimed in Claim 2, wherein the two parts of the inner joint box are of different lengths and the longer part is first attached at both ends to the respective cable ends and subsequently the shorter part is bonded to the longer part.
4. A method as claimed in any preceding claim, wherein prior to mounting the inner joint box at least one ring is passed about each cable end, each ring being subsequently located tightly around the inner joint box.
5. A method as claimed in Claim 4, wherein the rings are of the same material as the inner joint box.
6. A method as claimed in any preceding claim, wherein the conductors are located in the inner joint box by spacer elements of a material having substantially the same characteristics as the inner joint box material as regards effect upon electric field, whereby an electric field produced by the conductors when in use is substantially undisturbed by the presence of the spacer elements.
7. A method as claimed in Claim 6, wherein the spacer elements are fastened in the inner joint box.
8. A mehtod as claimed in Claim 8, wherein the joint box parts are provided with internal projections for locating the spacers.
9. A method as claimed in any preceding claim, wherein the inner joint box if of a polyurethane resin.
10. A method as claimed in any preceding claim, wherein said space is filled with a material having substantially the same characteristics as the inner joint box material as regards effect upon electric field, whereby an electric field produced by the conductors when in use is substantially undisturbed by the presence of the filling material.
11. A cable joint made by using a method as claimed in any preceding claim.
12. Apparatus to be used in carrying out the method as claimed in Claim 1, comprising an inner joint box of insulating material to be located surrounding the ends of the respective cable conductors when such ends have been interconnected, the inner joint box having a closable aperture through which the box can
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (18)

**WARNING** start of CLMS field may overlap end of DESC **. the respective cable ends, each taped cable end portion is inserted into a respective inlet aperture of the lower part 7 of the insulating inner joint box. The part 7, which is longer than the part 8, is fastened to each cable end. The cable ends are also fastened on a lower half 15 of a longitudinally-divisible metal outer joint box 15, 16 using clamping straps 13 and 14. The metal joint box 15, 16 is large enough to contain the inner joint box 7, 8. Conductors 17 and 18 are passed through respective apertures in repsective spacer members 19 which comprise discs which fit in the inner joint box and are provided with three such apertures symmetrically arranged. Bare ends of the corresponding conductors of the two cables are interconnected between the spacers 19. The upper part 8 of the inner joint box is then located on the lower part 7 after having applied some rapidly-curing polyurethane glue into V-shaped longitudinal grooves 20. The rings 9,10, and 12 are then located about the tapering inner joint box to clamp the parts 7 and 8 together. The inner joint box is then filled with oil through a filling opening, and the opening is then closed by insertion of a threaded stopper 21. Finally, an upper part 16 of the outer joint box is fastened to the lower part 15 and the space between the metal outer joint box 15, 16 and the insulating inner joint box 7, 8 is filled with a liquid polyurethane resin. After curing, this material has substantially the same characteristics as the inner joint box material as regards effect upon electric field, so that the electric field produced round the cables when they are energised is substantially undisturbed by the presence of the filler material. The spacers 19 are made of the same material as the inner joint box, or of another material as the inner joint box, or of another material having substantially the same characteristics as regards effect upon the electric field. The spacers are retained in the inner joint box by projections 22 formed on the inner surface of the box. The projections are arranged in groups lying in two planes transverse to the length of the inner joint box. Such projections must not be located at the uppermost parts of the inner joint box, i.e. in line with the filling aperture of the inner joint box. It will be apparent that, by using the above method, a hermetically-sealed resin envelope is arranged within a metal outer joint box, the internal volume being filled with insulating oil which envelopes the conductors. The resin filling of the outer joint box tenaceously adheres to the sheathing and to the inner joint box, so that internal pressure or internal vacuum will not give rise to leaks or implosions. WHAT WE CLAIM IS:
1. A method ofjoining the ends of two high tension cables, comprising interconnecting the ends of the repsective conductors; surrounding the interconnected conductor ends by an insulating inner joint box extending from the sheathing of one cable end to that of the other; filling the inner joint box with an insulating fluid; surrounding the inner joint box with an outer metal joint box; and filling the space betweent the inner and outer joint boxes with an insulating material.
2. A method as claimed in Claim 1, wherein the inner joint box is fitted around the interconnected conductor ends in two parts each extending longitudinally of the conductors, and the two envelope parts are bonded together at their longitudinal edges.
3. A method as claimed in Claim 2, wherein the two parts of the inner joint box are of different lengths and the longer part is first attached at both ends to the respective cable ends and subsequently the shorter part is bonded to the longer part.
4. A method as claimed in any preceding claim, wherein prior to mounting the inner joint box at least one ring is passed about each cable end, each ring being subsequently located tightly around the inner joint box.
5. A method as claimed in Claim 4, wherein the rings are of the same material as the inner joint box.
6. A method as claimed in any preceding claim, wherein the conductors are located in the inner joint box by spacer elements of a material having substantially the same characteristics as the inner joint box material as regards effect upon electric field, whereby an electric field produced by the conductors when in use is substantially undisturbed by the presence of the spacer elements.
7. A method as claimed in Claim 6, wherein the spacer elements are fastened in the inner joint box.
8. A mehtod as claimed in Claim 8, wherein the joint box parts are provided with internal projections for locating the spacers.
9. A method as claimed in any preceding claim, wherein the inner joint box if of a polyurethane resin.
10. A method as claimed in any preceding claim, wherein said space is filled with a material having substantially the same characteristics as the inner joint box material as regards effect upon electric field, whereby an electric field produced by the conductors when in use is substantially undisturbed by the presence of the filling material.
11. A cable joint made by using a method as claimed in any preceding claim.
12. Apparatus to be used in carrying out the method as claimed in Claim 1, comprising an inner joint box of insulating material to be located surrounding the ends of the respective cable conductors when such ends have been interconnected, the inner joint box having a closable aperture through which the box can
be filled; insulating fluid for filling the inner joint box; an outer metal joint box to be positioned around the inner joint box; and an insulating material for filling the space between the joint boxes.
13. Apparatus as claimed in Claim 12, wherein the inner joint box is formed of a synthetic resin.
14. Apparatus as claimed in Claim 13, wherein the inner joint box is divided longitudinally in two mating parts.
15. Apparatus as claimed in any one of Claims 12 to 14, including a pair of spacers for locating the conductors within the inner joint box in spaced-apart relation.
16. Apparatus as claimed in any one of Claims 12 to 15, including a plurality of ring for locating tightly around the periphery of inner joint box.
17. Apparatus as claimed in any one of Claims 12 to 16, wherein the insulating material is a synthetic resin.
18. A method as claimed in Claim 1 and substantially as hereinbefore described with reference to the accompanying drawing.
GB1500978A 1977-04-18 1978-04-17 Cable joints Expired GB1588655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7704223A NL170074C (en) 1977-04-18 1977-04-18 CONNECTION BETWEEN TWO ELECTRIC POWER CORDS.

Publications (1)

Publication Number Publication Date
GB1588655A true GB1588655A (en) 1981-04-29

Family

ID=19828383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1500978A Expired GB1588655A (en) 1977-04-18 1978-04-17 Cable joints

Country Status (5)

Country Link
BE (1) BE866118A (en)
DE (1) DE2816556A1 (en)
FR (1) FR2388430A1 (en)
GB (1) GB1588655A (en)
NL (1) NL170074C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7905180A (en) * 1979-07-03 1981-01-06 Electriciteits Mij Ijsselcentr CABLE SLEEVE.
NL8501016A (en) * 1985-04-04 1986-11-03 Ijzergieterij Lovink Bv METHOD FOR COUPLING ELECTRICAL CABLES BY WATERPROOF CONNECTION, AND SOCKET FOR APPLICATION OF SUCH A METHOD
DE9201004U1 (en) * 1992-01-29 1992-03-12 Felten & Guilleaume Energietechnik Ag, 5000 Koeln, De
WO1998032206A1 (en) * 1997-01-17 1998-07-23 Minnesota Mining And Manufacturing Company Variable size cable closures
NL1016313C2 (en) * 2000-10-03 2002-04-04 Lovink Enertech B V Cable splicing method, by removing insulation layer at cable ends and fitting sleeve onto one end before aligning both ends and fixing sleeve into position
DE10254507A1 (en) * 2002-11-22 2004-06-03 TECE Thews & Clüver GmbH cable sleeve
CN108711819A (en) * 2018-07-20 2018-10-26 深圳市沃尔核材股份有限公司 Cable intermediate joint and its installation method

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191408842A (en) * 1914-04-07 1915-04-29 Callenders Cable & Const Co Improvements in or relating to Electric Cables.
AT97856B (en) * 1923-06-30 1924-09-10 Eugen Frisch Connection sleeve for cables.
DE472970C (en) * 1927-06-17 1929-03-08 Bergmann Elek Citaets Werke Ak Sealing of the entry points on connecting sleeves, terminations or the like for multi-conductor cables
CH140235A (en) * 1928-08-14 1930-05-31 Siemens Ag Cable with connection sleeve.
US2867680A (en) * 1955-02-09 1959-01-06 Henry D Stecher Splice box
US3209067A (en) * 1961-08-21 1965-09-28 James W Channell Sealed splice enclosure for cables
FR1371385A (en) * 1963-07-26 1964-09-04 Trefimetaux Manufacturing process of connecting devices for electric cables
DE1490809B2 (en) * 1964-08-29 1971-01-21 Telefunken Patentverwertungsge Seilschaft mbH, 7900 Ulm Cable protection sleeve, in particular for telecommunication cables
FR1416236A (en) * 1964-12-01 1965-10-29 Siemens Ag Process for the production of a molding resin junction sleeve on a connection point, in particular of cables, conductors and tubes insulated with polyethylene
DE1640719A1 (en) * 1967-08-26 1970-08-27 Kabel Metallwerke Ghh Cable sleeve for connecting two single-core cables
DE1924987A1 (en) * 1969-05-16 1970-11-19 Felten & Guilleaume Kabelwerk Joint sleeve and coupling for cables, especi- - ally power cables
IT970677B (en) * 1972-06-24 1974-04-20 Pirelli PERFECTED JOINT FOR BELTED MIXED CABLES
DE2340759A1 (en) * 1973-08-09 1975-02-13 Bruno Bauer Straight-through or branch box - is sealed with polyurethane after application of aluminium foil and enclosure in mould

Also Published As

Publication number Publication date
FR2388430B1 (en) 1983-06-03
NL7704223A (en) 1978-10-20
NL170074B (en) 1982-04-16
NL170074C (en) 1982-09-16
BE866118A (en) 1978-10-19
DE2816556A1 (en) 1978-10-26
FR2388430A1 (en) 1978-11-17
DE2816556C2 (en) 1987-10-29

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19980416