EP0446404A1 - Anordnung einer elektrischen Hochspannungsdurchführung für draussen - Google Patents

Anordnung einer elektrischen Hochspannungsdurchführung für draussen Download PDF

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Publication number
EP0446404A1
EP0446404A1 EP90109975A EP90109975A EP0446404A1 EP 0446404 A1 EP0446404 A1 EP 0446404A1 EP 90109975 A EP90109975 A EP 90109975A EP 90109975 A EP90109975 A EP 90109975A EP 0446404 A1 EP0446404 A1 EP 0446404A1
Authority
EP
European Patent Office
Prior art keywords
bushing
high voltage
electrical
recited
assembly
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.)
Withdrawn
Application number
EP90109975A
Other languages
English (en)
French (fr)
Inventor
William Robert Rueth, Jr.
Kuo-Chin Chang
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.)
Joslyn Corp
Original Assignee
Joslyn 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 Joslyn Corp filed Critical Joslyn Corp
Publication of EP0446404A1 publication Critical patent/EP0446404A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators

Definitions

  • the present invention relates to a high voltage outdoor electrical bushing assembly.
  • High voltage electrical bushings are known in the art. Examples of such bushings are disclosed in U.S. Patent Nos. 1,811,887; 1,899,658; 3,071,672; 3,231,666; 3,504,106; 3,515,799; 3,551,587 and 4,563,545. Such electrical bushings are generally suitable for connection to a bare electrical cable and used as entrance bushings on various types of electrical equipment, such as interrupter switches and the like to allow connection of the equipment to an external electrical circuit. An example of such equipment is disclosed in U.S. Patent No. 3,947,650, assigned to the same assignee as the present invention.
  • such electrical equipment may be located outdoors or indoors.
  • the bushing In indoor applications, the bushing is generally connected to a shielded electrical cable. However, in outdoor applications, the bushing is generally connected to a bare electrical conductor. Consequently, it is necessary to provide additional clearance between the bare electrical conductor, normally at a relatively high voltage and the equipment housing, normally grounded.
  • weathersheds are provided to provide additional clearance between the bare electrical conductor and the equipment housing and to protect the bushing from flashover due to environmental factors such as rain, snow and the like. Examples of bushings adapted for outdoor use which include weathersheds are disclosed in U.S. Patent Nos. 1,811,887; 1,899,658; 3,071,672 and 4,563,545.
  • the present invention as claimed solves the problem of providing a high voltage outdoor electrical bushing utilizing a standard indoor bushing without the necessity of any modification to the equipment to which the bushing is attached. It allows standardization of the bushings used for indoor and outdoor applications.
  • the present invention relates to a relatively high voltage outdoor electrical bushing used, for example, as an entrance bushing on high voltage electrical equipment, such as an interrupter or the like, a portion of which is formed to meet the dimensional industrial standard for indoor bushings.
  • a high voltage outdoor electrical bushing in accordance with the present invention may e.g. include an indoor electrical bushing formed from a resinous material, such as an epoxy, and a complementary prophylactic weathershed or bushing adapter formed from an elastomeric material, which provides the additional clearance required for outdoor applications.
  • Such bushing adapter also provides electrical stress relief at the elastomer to air interface and the elastomer to epoxy interface. Because of the possibility of standardization of the bushing which is used for both indoor and outdoor applications, the cost of manufacturing can be substantially reduced.
  • the shown high voltage outdoor bushing assembly in accordance with the present invention is generally identified by the reference numeral 20.
  • the assembly includes a bushing 22 and a bushing adapter 24.
  • the high voltage bushing assembly 20 is adapted to be used, for example, as an entrance bushing on various types of electrical equipment, such as an interrupter switch as disclosed in U.S. Patent No. 3,947,650, assigned to the same assignee as the present invention and hereby incorporated by reference.
  • the high voltage bushing assembly 20 is rigidly mounted to a tank or housing 26 of the electrical equipment. More specifically, the bushing assembly 20 is disposed in an aperture 28, for example, on the top of the housing 26, such that a portion of the bushing 22 extends inwardly into the housing 26 and a portion extends outwardly from the top of the housing 26.
  • the bushing assembly 20 is then rigidly attached to the housing 26.
  • Various means are known in the art for attaching the bushing assembly 20 to a housing 26.
  • the bushing 22 is provided with an annular metallic flange 30 which extends radially outwardly from the bushing 22.
  • the flange 30 is embedded in the bushing 22 and welded to the housing 26.
  • a bushing 32 such as illustrated in FIG. 4, which does not include an embedded flange but, rather, an integrally formed flange 31, for example, from epoxy.
  • Such bushings 32 include a clamp 33, fasteners 35 and one or more gaskets 37 forming a clamping assembly 39 to allow bushing 32 to be clamped and gasketed to the housing 26 to form a seal therebetween.
  • An important aspect of the invention relates to the fact that a standardized bushing 22 or 32 which conforms to the industrial dimensional standard for indoor bushings (i.e., bushings normally attached to a shielded cable), can be used in an outdoor (i.e., connected to an unshielded cable) application with the addition of a prophylactic weathershed in the form of the bushing adapter 24 illustrated in FIG. 9. More specifically, the bushing 22 or 32 is designed to conform to the dimensional standards for bushings connected to shielded electrical cables promulgated in ANSI/IEEE Std.
  • FIG. 10 relates to 27 kilovolt (kv), 600 ampere (A) bushings while FIG. 11 relates to a 38 kv, 600 A bushing.
  • FIG. 3 relates to a 15-38 kv, 200A bushing. It will be appreciated by those of ordinary skill in the art that the principles of the present invention are applicable to all such dimensionally standard bushings adapted to be connected to shielded electrical cables.
  • the bushings 22 and 32 are exemplary and formed from epoxy, normally used in indoor applications for connection to shielded cables.
  • An example of bushing 22 is available from Joslyn Power Products Corporation of Alsip, Illinois under Part No. 030B900, for example, for a 27 kilovolt application.
  • the bushing adapter 24 In outdoor applications, where the bushing is normally attached to a bare electrical conductor (not shown), the bushing adapter 24 is required to provide clearance between the bare electrical conductor, generally at a relatively high voltage and the equipment housing 26, normally grounded, to prevent flashover.
  • the axial length of the bushing adapter 24 is dependent upon the magnitude of the electrical voltage at the bare electrical conductor. This length is adjusted by the number of skirt portions 34 used to form a weathershed. Such clearance requirements are clearly within the ordinary skill in the art.
  • the bushing adapter 24 is formed as a housing with an elastomeric material concentrically disposed about the bushing 22.
  • An annular well 38 is formed at one end having a contour complementary to the outer contour of an upper portion 40 of the bushing 22.
  • the bushing adapter 24 includes a centrally disposed electrical conductor or bushing rod 36, disposed between roughly the top 41 of the well 38 and extending outwardly from the top skirt portion 34 of the bushing adapter 24.
  • the bushing rod 36 in the bushing adapter 24 is adapted to be mated with a bushing rod 42 in the bushing 22 to form a continuous electrical connection therebetween.
  • the top end of the bushing rod 42 may be provided with a threaded hole, axially aligned with a threaded hole provided in the bottom portion of the bushing rod 36.
  • a threaded stud 44 may then be received in the threaded holes in the bushing rods 36 and 42 to make a secure connection therebetween.
  • a portion 43 of the bushing rod 36 extending outwardly from the bushing adapter 24 may be provided with a pair of flats 45 to facilitate assembly.
  • inserts 46 and 48 may be provided.
  • the insert 46 is a stress relief insert and is formed from an elastomeric semiconductor material and is formed as a ring disposed at the base of the bushing adapter 24 and acts as an interface between the bushing 22 and the bushing adapter 24.
  • the second insert 48 is a shielding insert, also formed as a ring, may be provided at the interface between the top of the bushing 22 and the top 41 of the well 38, formed in the bushing adapter 24.
  • the stress relief insert 46 reduces the electrical stress at the elastomer to air interface and the elastomer to epoxy interface. This is illustrated in FIGS. 5 and 6.
  • FIG. 5 illustrates a portion of a bushing assembly 20 wherein equal potential lines 50 are shown as a percentage of line to ground voltage due to the electrical potential difference between the bushing rods 36 and 42 (generally at a relatively high voltage) and the annular flange 30 (normally at ground potential).
  • the equal potential lines 50 are relatively closer together causing a relatively high electrical stress at the base of the bushing 22. Such electrical stress can break down the air adjacent the bushing 22 and cause the bushing assembly 20 to flashover.
  • the stress relief insert 46 and 48 as shown in FIG. 6, the equal potential lines 50 are spread out relative to the bushing rod 42 which results in reduced electrical stress at the epoxy to elastomer interface and the elastomer to air interface.
  • the shielding insert 48 is for shielding trapped air pockets between the conductor 43 to epoxy interface and the epoxy to elastomer interface (i.e., near the interface between the surfaces 59 and 41). If any air is trapped because of an imperfect fit of the components, any electrical voltage stress is eliminated because the edge of the high voltage surface in effect has been moved to the outer surface of the shielding insert 48.
  • the conductor rod 36 is prepared.
  • the conductor rod 36 may be fabricated with various high electrical conductivity metallic members, such as AA 6262-T9 aluminum or ASTM B301 copper, alloy 145, HO2 tempered. If aluminum is used for the conductor rod 36, it may be electro-tin-plated with approximately 0.8 thousandths of an inch (mils) . If the conductor rod 36 is formed from a copper alloy material, it may either be used as is or electro-tin-plated with approximately 0.2 mils.
  • the conductor rod 36 should be cleaned.
  • the conductor rod 36 may be degreased in an ultrasonic degreaser to remove machine oil and other contaminants. After the conductor rod 36 is degreased, it may be wiped down with a solvent, such as, methyl ethyl ketone, with a clean, lint-free towel with an upward motion towards the top of the conductor rod 36. After the conductor rod 36 is cleaned, it is placed in an appropriate fixture (not shown) for further processing.
  • a solvent such as, methyl ethyl ketone
  • the conductor rod 36 is prepared for one or more coats of adhesives. More specifically, the conductor rod 36 is masked with masking tape.
  • FIG. 7 illustrates portions 50 and 52 of the conductor rod 36 which should be masked. Masking tape is applied to a portion 50 since this portion 50 will extend outwardly from the bushing adapter 24. This portion 50 may extend approximately one inch in axial length. Approximately one-half inch of the conductor rod 36 is masked intermediate the end of the conductor rod 36 in the area identified with the reference numeral 52. The unmasked portion 54 between the portions 50 and 52 may be approximately one inch.
  • the portion 54 is unmasked to allow electrical contact between the bushing rod 36 and a semiconducting heat-shrinkable tube 57, discussed below.
  • an even coat of adhesive is applied.
  • Various types of adhesives may be used, such as Pliobond adhesive as manufactured by the w. J. Ruscoe Company of Akron, Ohio.
  • the adhesive is then cured, for example, for one hour at 149°C. After curing, the adhesive may be allowed to cool to ambient temperature.
  • a piece of ethylene propylene rubber (EPR) heat-shrinkable tubing 57 is cut to the length 58 identified in FIG. 7.
  • the inner diameter surface of the heat-shrinkable tubing may be cleaned with a solvent, such as Isopropanol.
  • the adhesive that is already cured on the conductor rod 36 should also be cleaned with a solvent, such as Isopropanol or Heptane.
  • Another adhesive such as Chemlock 238, as manufactured by the Elastomer Product Division of Lord Corporation of Erie, Pennsylvania, may be applied over the first adhesive on the conductor rod 36. After the second adhesive has partially dried, the masking tape is removed from the conductor rod 36.
  • the next step is to place the shielding insert 48 onto an end 59 of the conductor rod 36 as shown in FIG. 8.
  • the shielding insert 48 is formed with an annular shoulder 60 forming a stepped surface 61 and may be compression molded with a semiconductive compound, for example, ethylene propylene diene monomer (EPDM).
  • EPDM ethylene propylene diene monomer
  • the heat-shrinkable tubing 57 is then shrunk down with a proper torch near the stepped surface 61 to provide a good fit between the heat-shrinkable tubing and the shielding insert.
  • the entire assembly is then cured, for example, for one hour at approximately 149°C. After the assembly is cooled to ambient temperature, it should be allowed to stand for about twelve hours or more. Subsequently, the assembly may be degreased in an ultrasonic degreaser and stored in a closed container until further processing.
  • the assembly is placed in a mold cavity along with the stress relief insert 46.
  • the stress relief insert 46 may also be compression molded with a semiconductive EPDM compound.
  • the weathershed is then molded in a ram injection press with an elastomeric material to form the completed bushing adapter 24, as illustrated in FIG. 9.
  • the bushing adapter 24 is then assembled to the bushing 22 or 32. In order to facilitate assembly, a lubricant or grease may be applied to the mating surfaces.
  • the conductor rod 36 in the bushing adapter 24 is then attached to the bushing rod 42 as discussed above. When assembled, the bushing adapter 24 will be in relatively tight contact with the bushing 22.
  • the bottom surface 63 of the bushing adapter 24 will also be relatively tightly seated against the top of the flange 30.
  • FIGS. 1, 2 and 3 Various types of terminals 62, 64 and 66 may be attached to the free end 43 of the bushing rod 36 as shown in FIGS. 1, 2 and 3.
  • FIG. 1 illustrates a threaded terminal 62
  • FIG. 2 illustrates a straight rod 64
  • FIG. 3 illustrates a flattened pad 66 with connection holes.
  • the free end 43 of the bushing rod 36 may be provided with a threaded hole (not shown) for receiving a threaded portion (not shown) formed on one end of the terminal 62, 64 or 66. All such terminals are intended to be within the scope of the present invention.

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EP90109975A 1990-03-13 1990-05-25 Anordnung einer elektrischen Hochspannungsdurchführung für draussen Withdrawn EP0446404A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49010190A 1990-03-13 1990-03-13
US490101 1990-03-13

Publications (1)

Publication Number Publication Date
EP0446404A1 true EP0446404A1 (de) 1991-09-18

Family

ID=23946636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109975A Withdrawn EP0446404A1 (de) 1990-03-13 1990-05-25 Anordnung einer elektrischen Hochspannungsdurchführung für draussen

Country Status (5)

Country Link
EP (1) EP0446404A1 (de)
JP (1) JPH03272519A (de)
AR (1) AR242880A1 (de)
BR (1) BR9002449A (de)
CA (1) CA2013254A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767959A1 (fr) * 1997-09-03 1999-03-05 Pioch Sa Dispositif passe-tige et ensemble passe-tige le comportant
FR2769123A1 (fr) * 1997-09-29 1999-04-02 Transfix Toulon Soc Nouv Traversee isolante pour transformateur mt/bt
FR2786943A1 (fr) * 1998-12-07 2000-06-09 Soule Materiel Electr Dispositif de coupure electrique pour moyenne et haute tension
WO2004068637A2 (fr) * 2003-01-22 2004-08-12 Societe Nouvelle Transfix Toulon Traversee electrique comportant une partie superieure formant appendice incline et procede de fabrication
EP2312717A3 (de) * 2009-10-19 2013-07-31 Kabushiki Kaisha Toshiba Overhead-Eingriffsleitung für eine Buchse
WO2019025023A1 (de) * 2017-08-03 2019-02-07 Südkabel GmbH Steckbare durchführung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4796638B2 (ja) * 2009-02-19 2011-10-19 日本碍子株式会社 油入ブッシング

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943578A (en) * 1961-04-20 1963-12-04 Westinghouse Electric Corp Insulating devices and apparatus and methods for constructing the same
US3861777A (en) * 1973-09-20 1975-01-21 Permali Inc Separable electrical connector
EP0036243A1 (de) * 1980-03-06 1981-09-23 Amerace Corporation Klemmhülse
EP0283897A2 (de) * 1987-03-26 1988-09-28 ABB Kabel und Draht GmbH Stützisolator
GB2212005A (en) * 1987-11-05 1989-07-12 Pirelli General Plc Insulation barriers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943578A (en) * 1961-04-20 1963-12-04 Westinghouse Electric Corp Insulating devices and apparatus and methods for constructing the same
US3861777A (en) * 1973-09-20 1975-01-21 Permali Inc Separable electrical connector
EP0036243A1 (de) * 1980-03-06 1981-09-23 Amerace Corporation Klemmhülse
EP0283897A2 (de) * 1987-03-26 1988-09-28 ABB Kabel und Draht GmbH Stützisolator
GB2212005A (en) * 1987-11-05 1989-07-12 Pirelli General Plc Insulation barriers

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767959A1 (fr) * 1997-09-03 1999-03-05 Pioch Sa Dispositif passe-tige et ensemble passe-tige le comportant
EP0905721A2 (de) * 1997-09-03 1999-03-31 Pioch S.A. Durchführungsvorrichtung und Durchführungsanordnung mit einer solchen Durchführungsvorrichtung
EP0905721A3 (de) * 1997-09-03 1999-06-16 Pioch S.A. Durchführungsvorrichtung und Durchführungsanordnung mit einer solchen Durchführungsvorrichtung
US6156979A (en) * 1997-09-03 2000-12-05 Pioch S.A. Bushing device and bushing assembly including it
FR2769123A1 (fr) * 1997-09-29 1999-04-02 Transfix Toulon Soc Nouv Traversee isolante pour transformateur mt/bt
FR2786943A1 (fr) * 1998-12-07 2000-06-09 Soule Materiel Electr Dispositif de coupure electrique pour moyenne et haute tension
EP1009002A1 (de) * 1998-12-07 2000-06-14 Soule Materiel Electrique Mittel-und Hochspannungsschaltanlage
WO2004068637A2 (fr) * 2003-01-22 2004-08-12 Societe Nouvelle Transfix Toulon Traversee electrique comportant une partie superieure formant appendice incline et procede de fabrication
WO2004068637A3 (fr) * 2003-01-22 2005-01-06 Transfix Toulon Soc Nouv Traversee electrique comportant une partie superieure formant appendice incline et procede de fabrication
EP2312717A3 (de) * 2009-10-19 2013-07-31 Kabushiki Kaisha Toshiba Overhead-Eingriffsleitung für eine Buchse
WO2019025023A1 (de) * 2017-08-03 2019-02-07 Südkabel GmbH Steckbare durchführung

Also Published As

Publication number Publication date
AR242880A1 (es) 1993-05-31
JPH03272519A (ja) 1991-12-04
CA2013254A1 (en) 1991-09-13
BR9002449A (pt) 1991-11-12

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