US3001005A - Terminal bushings - Google Patents

Terminal bushings Download PDF

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Publication number
US3001005A
US3001005A US829091A US82909159A US3001005A US 3001005 A US3001005 A US 3001005A US 829091 A US829091 A US 829091A US 82909159 A US82909159 A US 82909159A US 3001005 A US3001005 A US 3001005A
Authority
US
United States
Prior art keywords
sleeve
resin
bushing
metal
conductor
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
US829091A
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English (en)
Inventor
Charles F Sonnenberg
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US829091A priority Critical patent/US3001005A/en
Priority to DEW28009A priority patent/DE1258491B/de
Priority to CH711460A priority patent/CH386510A/de
Priority to JP3180260A priority patent/JPS3619523B1/ja
Application granted granted Critical
Publication of US3001005A publication Critical patent/US3001005A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01B17/28—Capacitor type
    • 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
    • H01B17/30—Sealing
    • H01B17/303—Sealing of leads to lead-through insulators
    • H01B17/306—Sealing of leads to lead-through insulators by embedding in material other than glass or ceramics
    • 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
    • H01B17/38—Fittings, e.g. caps; Fastenings therefor
    • H01B17/40—Cementless fittings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the fundamental purpose of an entrance bushing in electrical apparatus is to allow passage of a current conductor at some voltage above ground through a grounded tank or container. Since the tank'top is usually a relatively thin sheet of steel, the voltage stress is concen trated on a small section of the bushing surface, much like a razor edge attempting to cut it.
  • resin bushing having an integrally bonded metallic mount- -i ng ilange and metallic cylinder.
  • IA further object of the inventionY isto provide a cast fresin bushing having a metallic cylinder which is utilized as an outer ground foil and as a portion of the mold for lcastin g the resin.
  • Still another object of the invention is to provide a cast resin bushing having a metallic screen embedded Within the molded material.
  • a further object of the invention is to utilize a porcelain casing as part of the mold for a cast resin bushing.
  • Still further object of the invention is to assure a voi'dless bond between the porcelain casing and the molded portion of a bushing.
  • cast-y resin bushing is formed by securing one end of a cylindrical metal sleeve to one side of a mounting flange and utilizing the sleeve as part of a mold for casting the bushing.
  • the inside of a porcelain casing is lined with a-exible, elastic material and the casing is disposed on ⁇ the other side of the mounting flange and utilized as another part o-f the mold.
  • a removable mold is provided at the other end of the metal sleeve.
  • FIGURE 1 is. a view, in section, of a cast bushing embodying features of the invention with the casting ,molds in position; l
  • FIG. 2 is a view, partly in section and partly in ele vation, of the bushing shown in FIG. 1, the molds being removed;
  • FIGS. 3 and 4 are views, similar to FIGS. l and 2, respectively, of another embodiment of the invention.
  • FIG. 5 is a view, partly in section and partly in elevation of still another embodiment of the invention.
  • the terminal bushing shown therein comprises a cylindrical metal sleeve 10, which is secured to a metal mounting flange 11, a conductor 12, which extends longitudinally through the sleeve 10 and is spaced from the sleeve, a thermoset resin body 13 and a cylindrical metal screen 14 which is embedded in the resin body 13 concentrically vwith the conductor 12.
  • the sleeve 10 and mounting flange 11 are preferablyY composed of aluminum since aluminum has substantially the same thermal coecient of expansion vas the thermoset resin material utilized in casting the body.
  • the sleeve 10 should be composed of a metal, such as copper, having substantially the same coeliicient of expansion. As shown, the sleeve 10 is welded to the flange 11. However, the sleeve and the flange may be formed as one piece.
  • a removable mold 15 is provided at the lower end of the sleeve 10.
  • Another removable mold 16 is provided on the upper surface of the flange 11. The mold 16 may be retained in position by attaching a cap 17 to the upper end of the conductor 12.
  • thermoset resin utilized for the body 13 should be one that has good physical strength, has a relatively low shrinkage during curing and has good adherence to metal and ceramics, such as porcelain and glass.
  • the resinous polymeric expoxides such as a thermosetting resin comprising a glycidyl polyether of a polyhydric phenol having a 1,2-epoxy equivalence of between l and 2, have been found to meet the foregoing requirements and have been successfully utilized in making bushings of the present type.
  • epoxideresins are described in U.S. Patents 2,728,744 and 2,739,134.
  • the metal sleeve 10 and the grounding iiange 11 are provided to distribute the voltage stress over a greater surface area.
  • the sleeve 10 is utilized as part of the mold for casting the resin.
  • the sleeve 10 may be provided with a plurality of longitudinal slots 18 as shown in FIG. 2.
  • the slots 18 permit the adhesion of the resin to the metal to pull the segments ofthe metal shell inwardly during the curing process, thereby preventing shrinkage of the resin from forming voids between the metal shell and the resin.
  • any voids between the resin and the metal may give rise to the phenomenon of internal corona causing radio interference.
  • a rubber sleeve or other temporary means, such as aluminum foil may bev provided around the sleeve 10 to retain the resin within the sleeve during the casting process.
  • the outer cylinder 10 When the metal sleeve 14 is embedded in the resin body, as shown in FIGS. 1 and 2, the outer cylinder 10 functions as an outer foil, thereby obtaining a condenser effect similar to that obtained in other condenser bushings.
  • the sleeve 14 is preferably an aluminum screen.
  • a screen is utilized instead of foil because it has sulicient strength to support its own weight and thus stand without collapsing in the resin while it is curing. Also, the many perforations in the screen permit the resin to bond completely through the screen. Thus, anyrelaxing caused by 'didcrence :in "thermal coeicience of expansion will not ⁇ permit the resin body to relax itself from the screen .and form internal voids.
  • aluminum has substantially the same thermal coeiiicientv of expansion as zthe thermoset resin utilized in the Apresent bushing.
  • Thei'lange .choices 11 maybe attached to a tank or container for electrical
  • the :casing 21 may beretained in Vposition on the flange 11 by a terminal cap 23 which is attached to the upper end of the :conductor 12.
  • the Isleeve'lt is preferably provided with a plurality of longitudinal slots 18 and a temporary means is provided on the sleeve to prevent theresin from coming out through the slots 18 during the casting process.
  • the mold may be removed, thereby providing the bushing'shown in FlG. 4 having ythe casing21 and the sleeve 10 bonded to the resin body.
  • the electrical connections may be made to the lower end of the conductor Y A212 and to .the terminal cap 2.3.
  • the mounting flange 11 may be attached to the cover of ka tank or container in the l'manner previously4 described.
  • the Vresin body may be cast yin the manner previously described with refer- .'enceto FIGS. Vl and 2.
  • the elastic liner 22 may be prelining 22 may be a silicone Vrubber or ayneoprene-base --rubber cement.
  • the elastic cone would be pressed over the mold- Ped bushing with the lower flanged surface acting as a gasvhetbetween'the porcelaincasing and the mounting flange.
  • the terminal cap After theV porcelain is. firmly pressed into place over the felastio cone the terminal cap is screwed down providing the compressive force .necessary to keep the porcelain Vin place.
  • the upper'flangecl surface on the elastic cone acts as a gasket between the terminal cap andthe Porcelain.
  • la mounting vllange ll is ⁇ formed as an integral part of the cast resin bushing body 13'.
  • the ilange 11 is "attached to a tank cover or wall 24 by means of bolts 2t).
  • the metal sleeve iti is not at-V tached to the tank cover 2d since the sleeve it) is a part ⁇ of the bushing'structureV and is lremovable with the bushi'ng. .lf'it is noti/desired to utilize the sleeve lt? as ⁇ a part .of 'mold for casting thebushing.
  • the sleeve itl' maybe omitted from the present structure'since the voltage ⁇ .stress is distributed by the metal screen 27 in themauner previously described. From the foregoing description it is apparent that the present invention provides a bushing which may be cast Vfrom a thermoset resin.
  • VSuch a bushing is suitable for lf .it is desired to utilize the bushing forY indoor Service. Outdoor ⁇ service a ceramic Weather casing may be Apro-- vided on 'the exposed 'portion of the bushing.
  • Bushings vconstructed in accordance with the present invention have been found to havefr less radio ⁇ interference than bushings of prior construction. r
  • said sleeve having a plurality of elongated slots around its periphery a conductor 4extendinglongitudinally through and spaced from the sleeve, a thermoset resin body lil-ling the .space between the conductor land the sleeve ⁇ and ad hering to they inside of the sleeve, said slots permitting .the Vsleeve to contract with the resin body, a cylindriealrnetal screen embedded in the resin body concentrically with. :the
  • a cylindrical metal sleeve having a metal flange secured thereto, said sleeve having a plurality of elongated longitudinal slots therein, a conductor extending longitudinally ythrough and spaced from the sleeve, a thermoset resin body filling the space between the conducto-r Iand the sleeve and adhering to the inside of the sleeve, said. slots permitting the sleeve to contract with theV resin body, said resin body extending beyond the ends of the sleeve, said conductor extending beyond the ends of said resin body, and apercelain casni-g disposed on said resin body above said flange.
  • a cylindrical metal sleeve having a metal flange Asecured thereto, said sleeve having a plurality of elongated' longitudinal slots .therein,fa conductor extending longitudinally through and spaced from the sleeve, a thermoset resin body filling the space Vbetween the conductor ⁇ and the sleeve ⁇ an-d vadhering to the inside of the sleeve, sai-'d slots perrnittingthe sleeveV ytoV contract with the resin'body, said resin :body

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Cable Accessories (AREA)
US829091A 1959-07-23 1959-07-23 Terminal bushings Expired - Lifetime US3001005A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US829091A US3001005A (en) 1959-07-23 1959-07-23 Terminal bushings
DEW28009A DE1258491B (de) 1959-07-23 1960-06-11 Elektrische Durchfuehrung mit Befestigungsflansch
CH711460A CH386510A (de) 1959-07-23 1960-06-23 Durchführung für elektrische Apparate od.dgl.
JP3180260A JPS3619523B1 (OSRAM) 1959-07-23 1960-07-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US829091A US3001005A (en) 1959-07-23 1959-07-23 Terminal bushings

Publications (1)

Publication Number Publication Date
US3001005A true US3001005A (en) 1961-09-19

Family

ID=25253502

Family Applications (1)

Application Number Title Priority Date Filing Date
US829091A Expired - Lifetime US3001005A (en) 1959-07-23 1959-07-23 Terminal bushings

Country Status (4)

Country Link
US (1) US3001005A (OSRAM)
JP (1) JPS3619523B1 (OSRAM)
CH (1) CH386510A (OSRAM)
DE (1) DE1258491B (OSRAM)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230301A (en) * 1963-07-12 1966-01-18 Westinghouse Electric Corp Externally threaded resin terminal bushing having a floating ground shield
US3242446A (en) * 1963-07-03 1966-03-22 Mc Graw Edison Co Bushing construction for encapsulated transformers
US3257501A (en) * 1961-04-20 1966-06-21 Westinghouse Electric Corp Self-cleaning electrical insulator constructions
US3258730A (en) * 1966-06-28 Switch block
US3312776A (en) * 1966-04-04 1967-04-04 Components For Res Inc Insulated conductor and method of fabricating the same
US3513253A (en) * 1968-07-24 1970-05-19 Westinghouse Electric Corp Cast condenser bushing having tubular metal coated mesh plates
US3515799A (en) * 1969-02-11 1970-06-02 Westinghouse Electric Corp Electrical bushing mounted in casing with foamed resin
US3585278A (en) * 1969-10-06 1971-06-15 Westinghouse Electric Corp Electrical bushings having insulating means including a cured elastomer containing mineral oil
US3611132A (en) * 1969-09-30 1971-10-05 Westinghouse Electric Corp Plug-in electrical bushing
US3646251A (en) * 1970-12-08 1972-02-29 Westinghouse Electric Corp Electrical bushing having stress-grading layer disposed within solid insulation including a ground layer term inated at each end with a layer of material having a voltage-dependent resistivity
US3935377A (en) * 1974-12-24 1976-01-27 Westinghouse Electric Corporation Electrical bushing comprising a resin body and a ceramic outer shell
US3949157A (en) * 1974-09-17 1976-04-06 Westinghouse Electric Corporation Electrostatic metallic shield-insert element for insulating castable members
US4243628A (en) * 1977-09-19 1981-01-06 Siemens Aktiengesellschaft Method for the manufacture of plastic insulators with screens for indoor and outdoor use
US4563545A (en) * 1984-01-30 1986-01-07 Bbc Brown Boveri Inc. High voltage outdoor bushing employing foam body seal and process for manufacture thereof
DE3507509A1 (de) * 1979-03-12 1986-09-04 Interpace Corp. (n.d.Ges.d.Staates Delaware), Purchase, N.Y. Hochspannungsfestes bauteil und verfahren zu seiner herstellung
US5152948A (en) * 1990-11-05 1992-10-06 Trantak Inc. Nut casting method
US5413443A (en) * 1993-09-22 1995-05-09 Joslyn Manufacturing Co. Method and apparatus for mounting an insulator thread onto a pin of a power line
EP2800113A1 (en) * 2013-04-29 2014-11-05 ABB Technology AG HV dry instrument transformer
EP3001433A1 (de) * 2014-09-29 2016-03-30 Siemens Aktiengesellschaft Stützisolator geeignet für einen Transformator
US20180219369A1 (en) * 2015-09-25 2018-08-02 Abb Schweiz Ag Cable fitting for connecting a high-voltage cable to a high-voltage component

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2623156B2 (de) * 1976-05-22 1980-05-22 Transformatoren Union Ag, 7000 Stuttgart Elektrische Durchführung mit Gieliharzstützer und Metallbefestigungsflansch

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1489369A (en) * 1919-06-12 1924-04-08 Steinberger Louis Insulator
GB228525A (en) * 1924-01-31 1925-11-26 Salman Silbermann Improvements in end connections and joints for extra high tension cables
US1767421A (en) * 1925-04-11 1930-06-24 Wirth Johann Karl Method of producing chemically stable articles
US1811887A (en) * 1926-04-14 1931-06-30 Condit Electrical Mfg Corp Insulator
FR1079048A (fr) * 1953-02-19 1954-11-25 Thomson Houston Comp Francaise Perfectionnements aux traverses étanches de courant
US2809228A (en) * 1955-09-26 1957-10-08 Gen Electric High voltage bushing ground sleeve
CH327883A (fr) * 1955-04-01 1958-02-15 Acec Borne de traversée du type condensateur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE890076C (de) * 1941-03-28 1953-09-17 Siemens Ag Feuchtigkeitsdichte Stromdurchfuehrung
FR924465A (fr) * 1946-03-26 1947-08-06 Pièces de traversée isolantes, étanches, pour conducteurs électriques
AT191490B (de) * 1952-03-19 1957-08-26 Cableries & Trefileries Sa Des Kabelkopf

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1489369A (en) * 1919-06-12 1924-04-08 Steinberger Louis Insulator
GB228525A (en) * 1924-01-31 1925-11-26 Salman Silbermann Improvements in end connections and joints for extra high tension cables
US1767421A (en) * 1925-04-11 1930-06-24 Wirth Johann Karl Method of producing chemically stable articles
US1811887A (en) * 1926-04-14 1931-06-30 Condit Electrical Mfg Corp Insulator
FR1079048A (fr) * 1953-02-19 1954-11-25 Thomson Houston Comp Francaise Perfectionnements aux traverses étanches de courant
CH327883A (fr) * 1955-04-01 1958-02-15 Acec Borne de traversée du type condensateur
US2809228A (en) * 1955-09-26 1957-10-08 Gen Electric High voltage bushing ground sleeve

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258730A (en) * 1966-06-28 Switch block
US3257501A (en) * 1961-04-20 1966-06-21 Westinghouse Electric Corp Self-cleaning electrical insulator constructions
US3242446A (en) * 1963-07-03 1966-03-22 Mc Graw Edison Co Bushing construction for encapsulated transformers
US3230301A (en) * 1963-07-12 1966-01-18 Westinghouse Electric Corp Externally threaded resin terminal bushing having a floating ground shield
US3312776A (en) * 1966-04-04 1967-04-04 Components For Res Inc Insulated conductor and method of fabricating the same
US3513253A (en) * 1968-07-24 1970-05-19 Westinghouse Electric Corp Cast condenser bushing having tubular metal coated mesh plates
US3515799A (en) * 1969-02-11 1970-06-02 Westinghouse Electric Corp Electrical bushing mounted in casing with foamed resin
US3611132A (en) * 1969-09-30 1971-10-05 Westinghouse Electric Corp Plug-in electrical bushing
US3585278A (en) * 1969-10-06 1971-06-15 Westinghouse Electric Corp Electrical bushings having insulating means including a cured elastomer containing mineral oil
US3646251A (en) * 1970-12-08 1972-02-29 Westinghouse Electric Corp Electrical bushing having stress-grading layer disposed within solid insulation including a ground layer term inated at each end with a layer of material having a voltage-dependent resistivity
US3949157A (en) * 1974-09-17 1976-04-06 Westinghouse Electric Corporation Electrostatic metallic shield-insert element for insulating castable members
US3935377A (en) * 1974-12-24 1976-01-27 Westinghouse Electric Corporation Electrical bushing comprising a resin body and a ceramic outer shell
US4243628A (en) * 1977-09-19 1981-01-06 Siemens Aktiengesellschaft Method for the manufacture of plastic insulators with screens for indoor and outdoor use
DE3507509A1 (de) * 1979-03-12 1986-09-04 Interpace Corp. (n.d.Ges.d.Staates Delaware), Purchase, N.Y. Hochspannungsfestes bauteil und verfahren zu seiner herstellung
US4563545A (en) * 1984-01-30 1986-01-07 Bbc Brown Boveri Inc. High voltage outdoor bushing employing foam body seal and process for manufacture thereof
US5152948A (en) * 1990-11-05 1992-10-06 Trantak Inc. Nut casting method
US5413443A (en) * 1993-09-22 1995-05-09 Joslyn Manufacturing Co. Method and apparatus for mounting an insulator thread onto a pin of a power line
EP2800113A1 (en) * 2013-04-29 2014-11-05 ABB Technology AG HV dry instrument transformer
WO2014177269A1 (en) * 2013-04-29 2014-11-06 Abb Technology Ag Hv dry instrument transformer
EP3001433A1 (de) * 2014-09-29 2016-03-30 Siemens Aktiengesellschaft Stützisolator geeignet für einen Transformator
WO2016050522A1 (de) * 2014-09-29 2016-04-07 Siemens Aktiengesellschaft Stützisolator geeignet für einen transformator
US20180219369A1 (en) * 2015-09-25 2018-08-02 Abb Schweiz Ag Cable fitting for connecting a high-voltage cable to a high-voltage component
US10355470B2 (en) * 2015-09-25 2019-07-16 Abb Schweiz Ag Cable fitting for connecting a high-voltage cable to a high-voltage component

Also Published As

Publication number Publication date
JPS3619523B1 (OSRAM) 1961-10-17
CH386510A (de) 1965-01-15
DE1258491B (de) 1968-01-11

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