US3352962A - Construction in insulated housing for terminating shielded high voltage cable - Google Patents

Construction in insulated housing for terminating shielded high voltage cable Download PDF

Info

Publication number
US3352962A
US3352962A US426338A US42633865A US3352962A US 3352962 A US3352962 A US 3352962A US 426338 A US426338 A US 426338A US 42633865 A US42633865 A US 42633865A US 3352962 A US3352962 A US 3352962A
Authority
US
United States
Prior art keywords
insulation
shield
cable
hollow
electrically conductive
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
US426338A
Other languages
English (en)
Inventor
Robert R Brown
Leonard E Daum
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.)
Elastic Stop Nut Corp
Original Assignee
Elastic Stop Nut Corp
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 Elastic Stop Nut Corp filed Critical Elastic Stop Nut Corp
Priority to US426338A priority Critical patent/US3352962A/en
Priority to GB704/66A priority patent/GB1124912A/en
Priority to BE674859D priority patent/BE674859A/xx
Priority to FR45464A priority patent/FR1463399A/fr
Application granted granted Critical
Publication of US3352962A publication Critical patent/US3352962A/en
Anticipated expiration legal-status Critical
Assigned to MANUFACTURERS HANOVER TRUST COMPANY reassignment MANUFACTURERS HANOVER TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERACE CORPORATION
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H02G15/02—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

Definitions

  • This invention relates to shielded electrical terminals, and more particularly to shielded and insulated housings or stress relief cones for terminating or connecting cables having a covering of insulation for the conductor thereof, and an electrically conductive shield surrounding the covering.
  • a portion of the shield is removed to bare the insulation covering and leave a terminal rim in the shield.
  • the housing or stress relief cone has a bore including a portion having an internal diameter for receiving and engaging the bared insulation, and a portion of relatively larger internal diameter for receiving the terminal portion of the conductive shield.
  • the stepped diameters tend to form a pocket or cavity to trap air in contact with the 'bared insulation. Such trapped air tends to break down and form a corona damaging to all adjacent material, and generate noise objectionable to radio reception.
  • the housing or stress relief cone is provided with an outer member of electrically conductive elastomeric material having an outer hollow engaging the shield and an inner hollow engaging the insulation, and an undercut groove forming a cavity and establishing an inwardly tapering shoulder between said hollows for assuring intimate contact between the stress relief material and the insulation of the cable along the inner hollow and for contacting at least the inner edge of said terminal rim of said conductive shield.
  • Axial thrust in applying the stress cone increases the contact between the shoulder and the terminal rim to a land which may cover the entire rim.
  • At least any air trapped between the outer member and the cable is outside of the contacting surfaces of the outer member and the cable insulation and within the cavity so as to be surrounded by conductive material with suificient electrical conductivity to control the electrical stresses arising at the termination of the shielded cable.
  • outer hollow is relieved radially outwardly to provide an inner end larger than the exterior end, to prevent separation of the inner hollow from intimate contact with the insulation of the cable by dilation of the inner end of the outer hollow in response to the reception of the shield within the outer hollow.
  • the single figure is a vertical axial section through a cable provided with a stress relief cone according to a preferred embodiment of the present invention.
  • the cable 10 shown comprises an electrical conductor 12 which may be stranded or solid metal wire such as copper or aluminum, and provided with an insulating covering, preferably a solid tube 14, and an electrically conductive shield 16. A portion of the shield is cut oif to expose a predetermined length of the insulation 14 and leaving a terminal rim 18 for the shield. A portion of the insulating covering is skived at 19 to expose a given length of conductor 12.
  • housing 20 In order to attain electrical continuity in the shield and preserve adequate electrical insulation between the continued shield and the exposed conductor, an insulating housing 20 is applied to the terminus of the cable 10.
  • Housing 20 has an inner member shown in the form of an inner cone 22 of resilient material with an axial bore having a cylindrical portion 24.
  • the relative diameters of the portion 24 and the insulating cover 14 are such that the covering may be inserted into the portion 24 by hand, the resilient property of the inner cone 22 permitting the cone to be radially expansible, thereby allowing a slight dilation of the internal surface of the portion 24 of the inner cone to admit the insulation 14.
  • the portion 24 firmly grips the exposed length of the covering 14 in an interference fit.
  • the tight fit along the exposed length of insulation increases the dielectric strength of the creep path along the insulation covering between the exposed conductor and the shield to assure that current will not pass between the conductor and the shield along the covering.
  • an outer member shown in the form of an outer cone 26 of electrically conductive resilient material surrounds the inner cone 22 and is contiguous therewith over a portion of the length thereof.
  • the axial bore provides the outer cone 26 with an inner hollow 28, forming an extension of the portion 24 and similarly receiving the insulation 14.
  • a sleeve 30 Extending axially beyond the shield outer cone 26 is a sleeve 30 within which the axial bore establishes an outer hollow 32 which is relieved to a larger diameter at the inner end thereof.
  • the relieved portion of hollow 32 is formed by an undercut groove, which establishes a cavity 36 and forms an inwardly tapering shoulder 34 between the hollows 28 and 32, for contacting the inner edge of the terminal rim 18.
  • the undercut groove and tapering shoulder assure intimate contact between the inner hollow 28 and the exposed insulation of the cable so that no air is trapped between the outer cone 26 and the insulation 14 of the cable along the inner hollow 28.
  • the relative normal diameters of the internal surfaces of hollows 28 and 32 and the corresponding external surfaces of the shield 16 and insulation 14 are such that the shield and covering may be inserted thereinto by hand.
  • Axial thrust in applying the housing 20 increases the contact of the shoulder 34 with the rim 18 to a land, which may cover the entire rim, so that intimate contact between the electrically conductive elastomeric material of the outer cone 26 and the insulation 14 is 3 assured allthe way up to the rim 18, despite the fact that rim 18. may have irregularities as a. result of cutting the shield to expose the insulation.
  • the resilient property of the outer cone 26 permits the parts thereof to be readily expansible, thereby allowing a slight dilation of the internal surfaces of hollows 28- and 32 to, admit the shield 16 and establish an interference fit between the shield and the surface 32 to attain an effective electrical connection between the shield andsleeve 30, and an interference fit between the insulation 14 and the internal surface of hollow 28. Additionally, the interference fit between the shield and the internal surface of hollow 32, as well as theinterference fit between the covering and the internal surface of hollow 28, provide a water tight seal along these overlapping surfaces to prevent water from approaching the electrical conductor 12 along. these surfaces. Thus the outer cone. 26 becomes, in effect, av shield for portions of the cable and the conductor which extend beyond the terminus 18 of the shield 16.
  • the outer cone 26 terminates in a bell flaring outwardly from the shield terminal rim 18 toward the cable terminal end with a convex surface of revolution 27, and the inner cone 22 has a mating concave surface of revolution 23 joined thereto bymolding.
  • the inner cone 22 and the outer cone 26 are fabricated of elastomeric material, the inner cone being an electrically insulating elastomer, while the outer cone is an electrically conductive elastomer.
  • the two cones are contiguous to form acomposite housing joined in a single assembly.
  • the cones are molded together so that the juncture between the cones is continuous and void free to enable the electrical stresses to be kept with? in control along thelength of the housing.
  • a composite housing for terminating a high voltage cable said cable having an electrical conductor, insula! tion covering said conductor, and an electrically conduc tive shield surrounding the insulation, a portion of said insulation being. exposed, said shield having a terminal rim; said housing comprisingan inner member molded of electrically insulating elastomeric material having a resilient portion for cooperating with theexposed insulation to firmly grip the same to increase the dielectric strength of the creep path along theinsulation; and an outer member of resilient electrically conductive elastomeric material.
  • said members being contiguous andjoined by molding in a single assembly and the junction between saidmembers being continuous and void free; said outer member having an outer hollow for engaging said shield and an inner hollow for engaging said insulation, and an undercut groove establishing a cavity anda shoulder in said outer member between said hollows, said shoulder tapering inwardly from said outer hollow to said inner hollow, in a direction away from said inner member for allowing intimate contact between the exposed insulation of the cable and the inner member and for, contacting the inner edge of saidterrninal rim of said shield along at least a portion of the shoulder such that any air trapped within the housing will be confined to said cavity and surrounded by electrically conductive materialhaving sufficient electrical conductivity to reduce the electrical stresses across the trapped air.
  • a composite housing for terminating a high voltage cable said cable having an electrical conductor, insulation covering said conductor, and an electrically conductive shield surrounding said insulation, a portion of said insulation being exposed, said shield having a terminal rim; said housing comprising an inner member molded of electrically insulating elastomeric material having a re silient portion for cooperating, with the exposed insulation to firmly grip the same to increase the dielectric strength of the creep path along the insulation; and an outer member of resilient electrically conductive elastomeric material molded around said inner member along at least a portion of the length of said inner member and having a portion for cooperating with said shield to attain an effectual electrical connection therewith; said members being contiguous and joined by molding in a single assembly and the junction between said members being continuous and void free; said outer member having an outer hollow including at least a portion for engaging said shield and aninner hollow for engaging said insulation from the terminal rim of the shield to the inner member, and an undercut groove establishing a cavity in said outer member at the jun
  • a prefabricated stress relief cone for the terminal end of a high voltage ground shield cable to prevent electrical breakdown of such cable said cable comprising a central conductor, a tube of insulation surrounding said central conductor, and a ground shield jacket of conductive material surrounding said insulation tube, said ground shield jacket being cut back from the terminal end of said cable to bare a terminal portion of said insulation tube andform a rim at the cut end of aid ground shield jacket, said stress relief cone having an axial bore for.
  • said stress relief cone having a sleeve portion of electrically conductive materialextending rearwardy in a direction away from the cable terminal end with an enlarged secondportion of said axial bore-in said sleeve portion for receiving and overlyingthe terminal portion of said ground shield jacket beyond said rim, and an undercut groove between said first-and second axial bore portions establishing a cavity and an annular shoulder for abutting the inner edge of said rim, said shoulder being inclined outwardly away from said axial bore to said undercut groove, said undercut groove andsaid shoulder defining the profile of said cavity, which profile froms an acute angle in all axial planespassing through said conductor such that any air trapped within the stress relief cone will be confined to saidlcavity and surrounded by electrically conductive material having suflicient electrical conductivity to reduce the electrical stresses across the trapped air.
  • a prefabricated stress relief cone for the terminal 'end of a high voltage ground shielded cable to prevent electrical breakdown of such cable said cable comprising acentral conductor, a tube of solid insulation surrounding said central conductor, and a ground shield jacket of conductive material surrounding said insulation tube, said ground shield jacketbeing cut back from the end of said cable to bare a terminal portion of said solid insulation tube and expose a cut end of said ground shield jacket, said stress relief cone comprising an inner cone of insulation and an outer cone of electrically conductive material in tandem and having a common axial bore for receiving said bared terminal portion of said solid insulation tube and including a first portion for receiving at least a portion of said insulation tube, said outer cone having a sleeve portion of electrically conductive material extending rearwardly with an enlarged second portion of said axial bore in said sleeve portion for receiving and overlying the terminal portion of said ground shield jacket, an undercut groove between said first and second portions of the axial bore and diverging radially outwardly in the direction from the second portion
  • a prefabricated stress relief cone for the terminal end of a high voltage ground shielded cable to prevent electrical breakdown of such cable said cable comprising a central conductor, a tube of solid insulation surrounding said central conductor, and a ground shield jacket of conductive material surrounding said solid insulation tube, said ground shield jacket being cut back from the end of said cable to bare a terminal portion of said solid insulation tube and expose a cut end of said ground shield jacket; said stress relief cone comprising an inner cone of insulation and an outer cone of electrically conductive material in tandem and having a common axial bore for receiving said bared terminal portion of said solid insulation tube and including a first portion in said outer cone for receiving at least a portion of said insulation tube, said outer cone having a bell flaring outwardly from said axial bore toward the cable end with a convex surface of revolution, and said inner cone having a mating concave surface of revolution joined thereto by molding, said outer cone having a sleeve portion of electrically conductive material extending rear- Wardly therefrom with an enlarged second portion of

Landscapes

  • Cable Accessories (AREA)
US426338A 1965-01-18 1965-01-18 Construction in insulated housing for terminating shielded high voltage cable Expired - Lifetime US3352962A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US426338A US3352962A (en) 1965-01-18 1965-01-18 Construction in insulated housing for terminating shielded high voltage cable
GB704/66A GB1124912A (en) 1965-01-18 1966-01-06 Electrical stress relief cone for shielded electrical cables
BE674859D BE674859A (nl) 1965-01-18 1966-01-07
FR45464A FR1463399A (fr) 1965-01-18 1966-01-11 Perfectionnements à des câbles électriques blindés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US426338A US3352962A (en) 1965-01-18 1965-01-18 Construction in insulated housing for terminating shielded high voltage cable

Publications (1)

Publication Number Publication Date
US3352962A true US3352962A (en) 1967-11-14

Family

ID=23690376

Family Applications (1)

Application Number Title Priority Date Filing Date
US426338A Expired - Lifetime US3352962A (en) 1965-01-18 1965-01-18 Construction in insulated housing for terminating shielded high voltage cable

Country Status (4)

Country Link
US (1) US3352962A (nl)
BE (1) BE674859A (nl)
FR (1) FR1463399A (nl)
GB (1) GB1124912A (nl)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634604A (en) * 1970-11-09 1972-01-11 G & W Electric Speciality Co Closed cell elastomeric sponge power cable terminator
US3808352A (en) * 1972-10-26 1974-04-30 Minnesota Mining & Mfg Elastomeric terminal insulator and stress cone and conductor terminated therewith
US3860741A (en) * 1974-01-18 1975-01-14 Thomas & Betts Corp Stress cone
US3932933A (en) * 1973-10-04 1976-01-20 The Scott & Fetzer Company High voltage cable coupler with termination adaptor and method of constructing cable termination
US3993387A (en) * 1974-11-25 1976-11-23 Amerace Corporation Electrical connector and method of making same
US4159860A (en) * 1975-05-14 1979-07-03 The Scott & Fetzer Company High voltage cable coupler with termination adaptor
US20060272842A1 (en) * 2002-10-30 2006-12-07 Ubaldo Vallauri Process for manufacturing the elastomeric sleeve of a joint for electrical cables and manufacturing apparatus thereof
US10530143B2 (en) * 2017-09-21 2020-01-07 Accessesp Uk Limited Stress control cones for downhole electrical power system tubing encapsulated power cables
EP3731361A1 (en) * 2019-04-26 2020-10-28 Brugg Kabel AG Cable fitting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379942A (en) * 1942-12-31 1945-07-10 Bell Telephone Labor Inc Cable terminating means
US3243756A (en) * 1963-04-09 1966-03-29 Elastic Stop Nut Corp Shielded electrical connection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379942A (en) * 1942-12-31 1945-07-10 Bell Telephone Labor Inc Cable terminating means
US3243756A (en) * 1963-04-09 1966-03-29 Elastic Stop Nut Corp Shielded electrical connection

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634604A (en) * 1970-11-09 1972-01-11 G & W Electric Speciality Co Closed cell elastomeric sponge power cable terminator
US3808352A (en) * 1972-10-26 1974-04-30 Minnesota Mining & Mfg Elastomeric terminal insulator and stress cone and conductor terminated therewith
US3932933A (en) * 1973-10-04 1976-01-20 The Scott & Fetzer Company High voltage cable coupler with termination adaptor and method of constructing cable termination
US3860741A (en) * 1974-01-18 1975-01-14 Thomas & Betts Corp Stress cone
US3993387A (en) * 1974-11-25 1976-11-23 Amerace Corporation Electrical connector and method of making same
US4159860A (en) * 1975-05-14 1979-07-03 The Scott & Fetzer Company High voltage cable coupler with termination adaptor
US20060272842A1 (en) * 2002-10-30 2006-12-07 Ubaldo Vallauri Process for manufacturing the elastomeric sleeve of a joint for electrical cables and manufacturing apparatus thereof
US7645408B2 (en) * 2002-10-30 2010-01-12 Prysmian Cavi E Sistemi Energia S.R.L. Process for manufacturing the elastomeric sleeve of a joint for electrical cables and manufacturing apparatus thereof
US10530143B2 (en) * 2017-09-21 2020-01-07 Accessesp Uk Limited Stress control cones for downhole electrical power system tubing encapsulated power cables
EP3731361A1 (en) * 2019-04-26 2020-10-28 Brugg Kabel AG Cable fitting
WO2020216939A1 (en) * 2019-04-26 2020-10-29 Brugg Kabel Ag Cable fitting

Also Published As

Publication number Publication date
BE674859A (nl) 1966-07-07
FR1463399A (fr) 1966-12-23
GB1124912A (en) 1968-08-21

Similar Documents

Publication Publication Date Title
US3725846A (en) Waterproof high voltage connection apparatus
US3376541A (en) Safe break terminator
US3992567A (en) Internal stress-grading system for electrical connections
US3622688A (en) Cable lead bushing
US3352962A (en) Construction in insulated housing for terminating shielded high voltage cable
US3377420A (en) Device for terminating outdoor electric cables
GB752377A (en) Improvements in or relating to joints or terminals for high-tension electric cables
GB1339502A (en) Splice connector and a method of making a splice connection
US3598895A (en) Connector for double-shielded cable
GB2040114A (en) High voltage electrical connector shield
US3753203A (en) Shielded high voltage connector
US2967899A (en) Stop joints and feeding joints for singlecore oil-filled electric cables
US3343122A (en) Junction device for electric cable of the coaxial type, more particularly for high-tension coaxial cable
GB1401833A (en) High voltage cable terminator
US2827508A (en) Terminal assembly for shielded cables
US2777894A (en) Male connector
US2373843A (en) Insulated electrical conductor terminal structure
US3474393A (en) High voltage cable terminal
US2913696A (en) Electrical apparatus
US3860741A (en) Stress cone
US3934071A (en) Air entrance bushing for gas-insulated bus
US3335215A (en) Stress relief apparatus
US3450827A (en) Cable termination having stress relief means
US3378627A (en) Adaptors for terminating devices in high voltage power cables
JP5097248B2 (ja) ケーブル終端接続部

Legal Events

Date Code Title Description
AS Assignment

Owner name: MANUFACTURERS HANOVER TRUST COMPANY, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:AMERACE CORPORATION;REEL/FRAME:005465/0013

Effective date: 19900731