US3649739A - Cable joints with communicating fluid ducts and methods of making same - Google Patents

Cable joints with communicating fluid ducts and methods of making same Download PDF

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Publication number
US3649739A
US3649739A US119507A US3649739DA US3649739A US 3649739 A US3649739 A US 3649739A US 119507 A US119507 A US 119507A US 3649739D A US3649739D A US 3649739DA US 3649739 A US3649739 A US 3649739A
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US
United States
Prior art keywords
ducts
pair
conductors
duct
metal
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 - Lifetime
Application number
US119507A
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English (en)
Inventor
John Derrick Endacott
Michael Savvas Papadopulos
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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Filing date
Publication date
Application filed by BICC PLC filed Critical BICC PLC
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Publication of US3649739A publication Critical patent/US3649739A/en
Anticipated expiration legal-status Critical
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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
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/24—Cable junctions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49194—Assembling elongated conductors, e.g., splicing, etc.
    • Y10T29/49195—Assembling elongated conductors, e.g., splicing, etc. with end-to-end orienting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49888—Subsequently coating

Definitions

  • the ducts of the or each pair extend from the central duct of respective conductors outwards at an acute angle to the common axis of the conductors to communicate with one another, as by directly intersecting within the body or at or adjacent to its surface, or by opening into a common recess in that surface.
  • the ducts are preferably formed by drilling inwards from the outer surface of the body which is itself preferably formed by an MIG welding process.
  • This invention relates to a method of making joints between electric power cable conductors, of the kind (hereinafter referred to as hollow core conductors) having a central duct and to joints made by the method. More particularly, the invention is concerned with a method which comprises forming a body of metal between the spaced ends of two hollow core conductors in such a way that said body adheres to the facing cut ends of the two conductors and fills the space between them.
  • the object of the present invention is to provide an improved method of making such joints with provision for fluid flow between hollow core conductors and, in accordance with the invention, during or after the formation of the body of metal between the conductor ends, at least one pair of straight ducts is formed within the metal body, one duct of the or each pair extending from the central duct of one conductor outwards at an acute angle to the common axis of the conductors to communicate with the other duct of the pair, which extends outwards from the central duct of the other conductor at an acute angle to the said axis.
  • the or each pair of ducts is preferably formed by drilling inwards from the outer surface of the metal body at an appropriate angle, successively towards each of the conductor ducts, in such a way that the two bores thus formed in the body intersect within the body, or meet at or adjacent to the surface of the body, or open into a recess in the surface of the body but other methods of forming the ducts can be used.
  • One such alternative method is to form the ducts by means of removable mould cores arranged in position between the conductor ends before the metal body is formed between them.
  • This method is especially applicable when the body of metal filling the space between the conductor ends is formed by a method other than the MIG welding process, referred to in the above-mentioned copending applications, for example by pouring molten metal into the cavity or by an exothermic powder process (as referred to in a pending U.K. Pat. application No. 55413/69).
  • the design of the cores is simplified if the ducts intersect the surface of the metal body at spaced positions and are interconnected by a surface channel from which the core may be removed laterally.
  • removable mould cores are used to form the ducts they may be enclosed in thin tubes of a metal which may adhere to the cast metal and the tubes may remain in situ in the metal body, when the cores are removed, to form linings for the ducts.
  • the conductor ducts are preferably closed by duct plugs before the formation of the joint so as to prevent flow of oil from the ducts before and during the jointing operation.
  • Such plugs will remain in situ after the body has been formed and are designed to allow fluid to flow from the conductor ducts into the ducts formed in the metal body.
  • the duct plugs may each be formed with a central bore which is closed at the end of the plug adjacent to the cut end of the conductor but extends for a sufficient distance through the plug to enable it to become connected to an acute angle duct, drilled through the body and the closed end of the plug.
  • the inner ends of the cores may act as plugs for temporarily closing the ends of the central bores in the duct plugs, during the formation of the body around the cores.
  • FIG. 1 shows a completed conductor joint in accordance with the invention
  • FIGS. 2 and 3 show stages in two methods in accordance with the invention.
  • FIG. I shows a sectional elevation of a completed joint between two hollow conductors I and 2, each of which has been cut at an appropriate angle to provide a cavity between their cut ends in which a body of metal 3 has been formed for example by the MIG technique referred to in the above-mentioned cognate applications.
  • duct plugs 4 and 5 Prior to the jointing operation, duct plugs 4 and 5 have been driven into the conductor ducts, the plugs being slightly oversize in order to bring about some separation of the conductor elements and thus to facilitate extraction of oil from the conductor ducts during the jointing operation.
  • Each of the plugs 4 and 5 has a central blind bore (6 and 7) extending to within a short distance of the external end of the plug, which is preferably preshaped to make a flush surface with the cut end of the conductor into which the plus is inserted.
  • the conductor screen is continued over the body 3 either directly or after a thin metal sheet has been applied to cover the junction between the ducts 8 and 9.
  • FIG. 2 One method of ensuring the correct alignment of the ducts 8 and 9 when they are formed after the body 3 has been dressed down is shown in FIG. 2, from which it will be seen that a drilling jig 10 is clamped onto thejoint between the con ductors.
  • FIG. 3 An alternative method which enables the drilling to be carried out before the body 3 has been dressed down is shown in FIG. 3.
  • a castingjig 11 which is provided with vacuum ducts for the extraction of oil from the conductor ends is itself used as a drilling jig.
  • steel inserts l2 and 13 are provided in the copper body of the casting jig which also serves as a heat sink.
  • the ducts 8 and 9 intersect at a point 14 within the body 3.
  • the outer ends 15 and 16 of the ducts 8 and 9 which extend beyond the intersection 14 can be closed permanently for example by means of self-tapping screws which can themselves be dressed down to the profile of the joint surface.
  • a casting jig is employed similar to that illustrated in FIG. 3 but without steel inserts 12 and 13 and a drilling jig is fitted into the upper part of the cavity of the casting jig after the cast body 3 has been formed.
  • the ducts in the cast body have been shown arranged in a vertical radial plane, they can be arranged in any other radial plane and, as indicated above, more than one pair of ducts may sometimes be used in order to increase the oil flow from one conductor to the other. Arrangement of the ducts in a plane other than the vertical plane may assist in flushing out drilling swarf from the ducts before their ends are sealed by a conductor screen or otherwise.
  • Free flow of oil from the ducts can be tested for by temporarily inserting an expansible plug into each duct in turn while checking the flow of oil from the other duct of the pair.
  • the joint in accordance with the present invention can be designed to offer very little increase in the resistance to flow of fluid through the conductors.
  • a method of making a joint between two hollow core conductors having central ducts comprising positioning end parts of said conductors in axial alignment with cut ends thereof spaced from one another and introducing metal between said out ends to form a body of said metal that adheres to said out ends and fills the space between them, forming at least one pair of straight ducts within said body, each duct of said pair extending from the central duct of a respective one of said conductors outwards at an acute angle to the common axis of the conductors and communicating with the other duct of the pair.
  • each duct of said pair is formed after the formation of the said body by drilling inwards from the outer surface thereof.
  • a method as claimed in claim 2 comprising the preliminary step of inserting in the ends of said hollow core conductors duct plugs each formed with a central bore which is closed at the end of the plug adjacent to the cut end of the conductor and in which each of the said ducts is drilled not only through the said body but also through the closed end of the respective duct plugs.
  • a method as claimed in claim 2 comprising using a drill with a hollow center to form the said ducts.
  • a method as claimed in claim 1 comprising forming a recess in the surface of said body and forming said pair of straight ducts in communication with said recess.
  • a method as claimed in claim 7 comprising enclosing said cores in thin tubes of a metal to which the metal of said body will adhere.
  • a method as claimed in claim 1 comprising the preliminary step of inserting duct plugs in said hollow core conductors to prevent flow of oil before and during the formation of said metal body.
  • a joint between two axially aligned hollow core conductors having central ducts comprising a body of metal adhering to facing cut ends of said conductors and filling a space between them and at least one pair of straight ducts within said body, each duct of said pair extending from the central duct of a respective one of said conductors outwards at an acute angle to the common axis of the conductors and communicating with one another.
  • a joint as claimed in claim 13 in which the ducts of said pair intersect one another at a place within the said metal bod 1%
  • a joint as claimed in claim 14 in which each of said ducts is closed between the place where they intersect and the surface of the metal body.
  • a joint as claimed in claim 13 in which the ducts of said pair meet one another at the surface of said metal body.
  • each duct of said pair opens into a common recess in the surface of said body 19.
  • An electric cable joint comprising at least one joint as claimed in claim 13 and means insulating and enclosing same.

Landscapes

  • Gas Or Oil Filled Cable Accessories (AREA)
  • Cable Accessories (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
US119507A 1970-03-09 1971-03-01 Cable joints with communicating fluid ducts and methods of making same Expired - Lifetime US3649739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1127070 1970-03-09

Publications (1)

Publication Number Publication Date
US3649739A true US3649739A (en) 1972-03-14

Family

ID=9983126

Family Applications (1)

Application Number Title Priority Date Filing Date
US119507A Expired - Lifetime US3649739A (en) 1970-03-09 1971-03-01 Cable joints with communicating fluid ducts and methods of making same

Country Status (9)

Country Link
US (1) US3649739A (OSRAM)
JP (1) JPS5223074B1 (OSRAM)
CA (1) CA955663A (OSRAM)
DE (1) DE2110106C3 (OSRAM)
FR (1) FR2084326A1 (OSRAM)
GB (1) GB1326033A (OSRAM)
SE (1) SE383235B (OSRAM)
SU (1) SU563127A3 (OSRAM)
ZA (1) ZA711122B (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043031A (en) * 1974-08-02 1977-08-23 Felten & Guilleaume Carlswerk Ag Method of manufacturing internally cooled high-energy cable

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1819882A (en) * 1927-08-18 1931-08-18 Gen Electric Insulated cable joint
US1988279A (en) * 1932-03-02 1935-01-15 Gen Electric Terminal and joint for electric cables
US3453372A (en) * 1966-05-25 1969-07-01 British Insulated Callenders Joints for electric cables
GB1159204A (en) * 1966-07-05 1969-07-23 British Callender S Cables Ltd Improvements in Joints for Electric Cables
US3469014A (en) * 1966-05-25 1969-09-23 British Insulated Callenders Connections for hollow electric conductors
DE1918167A1 (de) * 1968-04-11 1969-10-23 British Insulated Callenders Verfahren zur Herstellung einer Stossverbindung oder eines Abschlusses an elektrischen Kabeln

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1819882A (en) * 1927-08-18 1931-08-18 Gen Electric Insulated cable joint
US1988279A (en) * 1932-03-02 1935-01-15 Gen Electric Terminal and joint for electric cables
US3453372A (en) * 1966-05-25 1969-07-01 British Insulated Callenders Joints for electric cables
US3469014A (en) * 1966-05-25 1969-09-23 British Insulated Callenders Connections for hollow electric conductors
GB1159204A (en) * 1966-07-05 1969-07-23 British Callender S Cables Ltd Improvements in Joints for Electric Cables
DE1918167A1 (de) * 1968-04-11 1969-10-23 British Insulated Callenders Verfahren zur Herstellung einer Stossverbindung oder eines Abschlusses an elektrischen Kabeln
FR2006070A1 (OSRAM) * 1968-04-11 1969-12-19 British Insulated Callenders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043031A (en) * 1974-08-02 1977-08-23 Felten & Guilleaume Carlswerk Ag Method of manufacturing internally cooled high-energy cable

Also Published As

Publication number Publication date
CA955663A (en) 1974-10-01
DE2110106A1 (de) 1971-09-23
FR2084326A1 (OSRAM) 1971-12-17
DE2110106B2 (de) 1973-06-28
DE2110106C3 (de) 1974-01-17
ZA711122B (en) 1971-11-24
SU563127A3 (ru) 1977-06-25
GB1326033A (en) 1973-08-08
SE383235B (sv) 1976-03-01
JPS5223074B1 (OSRAM) 1977-06-22

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