US3760089A - Electrical bushing assembly having resilient means enclosed within sealing means - Google Patents

Electrical bushing assembly having resilient means enclosed within sealing means Download PDF

Info

Publication number
US3760089A
US3760089A US00247951A US3760089DA US3760089A US 3760089 A US3760089 A US 3760089A US 00247951 A US00247951 A US 00247951A US 3760089D A US3760089D A US 3760089DA US 3760089 A US3760089 A US 3760089A
Authority
US
United States
Prior art keywords
bushing
support member
circular
lead tube
coil springs
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
US00247951A
Other languages
English (en)
Inventor
J Hildenbrand
L Wagenaar
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.)
ABB Inc USA
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
Application granted granted Critical
Publication of US3760089A publication Critical patent/US3760089A/en
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • ABSTRACT Mechanical stress-relieving means for high-voltage bushings.
  • Resilient means is located between a first member attached to the bushing lead tube and a second member which is adjacent to the upper weather casing of the bushing. Different rates of thermal expansion of the bushing components are compensated for by the resilient means.
  • Bushing dielectric seal between the first and second members is provided by either a gasket member or a semi-flexible band.
  • Oil expansion caps are not ordinarily required. Oil expansion may be compensated for by an oil reservoir connected with the oil contained within the bushing. Or, the bushing may not be sealed and the oil therein allowed to communicate with the oil in its associated electrical apparatus.
  • a stress-relieving means must still be used. Consequently, with the prior art arrangements which have stress-relieving means contained within the expansion cap, the bushing is unnecessarily large when oil expansion provided by the expansion cap is not required.
  • the stress-relieving means includes a cap located near the top of the lead tube, a cup located between the cap and the upper casing of the bushing, and
  • a resilient means and a gasket located between the cup and the cap.
  • the resilient means places the proper forces on the bushing components and allows relative movement between the casing structure and the lead tube to reduce mechanical stresses.
  • the gasket seals the bushing dielectric from its surroundings.
  • a flexible band is attached between the cap and the cup to seal the bushing dielectric from its surroundings.
  • the stressrelieving means is positioned near the bushing support member and includes resilient means located inside a circular channel member.
  • the circular channel member telescopes with the bushing support member to relieve the stresses.
  • a flexible band is attached to the circular channel and to the bushing support member to seal the bushing dielectric from its surroundings.
  • the resilient means is located between a slotted ring member and the bushing support member. The bushing support member telescopes into the slot of the ring member.
  • FIG. 1 is an elevational view, partly in section, of an electrical bushing having stress-relieving means near an end of the bushing and constructed according to an embodiment of this invention
  • FIG. 2 is a partial sectional view of another embodiment of the electrical bushing shown in FIG. ll;
  • FIG. 3 is a partial elevational view, partly in section, of an electrical bushing having stress-relieving means near the center of the bushing and constructed according to an embodiment of this invention.
  • FIG. 4 is a partial view of another embodiment of the electrical bushing shown in FIG. 3.
  • the lead tube It is cylindrically shaped and has ends 12 and I4 and a longitudinal axis extending between the ends ]l2 and M.
  • Bushing leads which are not illustrated, may be attached to the lead tube covers 116 and 18 for providing connections between the bushing and its associated electrical circuits.
  • a casing means including an upper casing 20, a lower casing 22, and a bushing support member 2d, is concentrically disposed around the lead tube It).
  • the bushing is normally attached to an electrical apparatus enclosure by the support flange 26.
  • the casings 20 and 22 may be constructed of any suitable material, such as porcelain or an epoxy resin.
  • the bushing support member 24 is constructed of a metallic material whtn the bushing is relatively large.
  • the lower portion of the casing 22 is attached to the end M of the lead tube It) by a suitable means.
  • the bushing support member 2% is positioned between the casings 20 and 22 and is efiectively connected to the end M of the lead tube 10 through the lower casing 22.
  • the upper casing 20 is attached to the end 12 of the lead tube 10 by a stress-relieving means 28.
  • the stress-relieving means 28 comprises a cap 30 having a substantially circular shape with an opening 32 therein through which the end 12 of the lead tube extends.
  • the cap 30 is secured to the lead tube 10 by the spanner nut 34 which is threadably engaged with the lead tube 10.
  • the cap 30 includesslots, such as the slot 36, into which the upper ends of the coil springs 38 are placed.
  • the number of coil springs 38 and the force provided thereby depends on the size and type of the bushing assembly.
  • a substantially circular cup 40 having an opening 42 in the bottom portion 44 of the cup 40 has slots, such as the slot 46, into which the lower ends of the coil springs 38 are placed.
  • the cup 40 contains an outwardly extending flange 48 which is positioned substantially between the cap 30 and the upper casing 20.
  • a suitable sealing means such as the gasket 50, provides a fluid-tight seal between the flange 48 and the upper casing 20. This prevents leakage of the fluid dielectric 52 which is illustrated as oil although other dielectrics may be used.
  • the coil springs 38 are in a compressed state, thus axial forces act upon the cap 30 and the cup 40 which tend to move them apart.
  • the cap 30 is secured to the lead tube 10 at the end 12.
  • the flange 48 of the cup 40 is seated on the gasket 50 which is positioned adjacent to the upper casing 20.
  • tensile stresses are placed on the lead tube 10 and compressive stresses are placed on the casings and 22 and the bushing support member 24.
  • the compressive stresses maintain proper sealing surfaces between the bushing casings 20 and 22 and the bushing support member 24.
  • the expansion means comprises a suitably shaped gasket, such as the O-ring 54. Slots in the cap and in the cup flange 48 provide a space for proper seating of the O-ring 54.
  • the casing means that is, the casings 20 and 22 and the bushing support member 24
  • the compressed lengths of the springs 38 change. This changes the separation distance between the flange 48 and the cap 30. Therefore, the O-ring 54 must expand or contract, depending on the direction of the change,
  • the expansion means comprises a flexible band 56 constructed of a suitable material, such as semi-rigid metallic sheet.
  • the upper edge 58 of the flexible band 56 is attached to the cap 30 by a suitable process, suchas brazing or soldering.
  • the bottom edge 60 of the flexible band 56 is similarly attached to the cup flange 48.
  • the flexible band 56 may be shaped to provide a larger enclosed space and act as an oil expansion chamber.
  • FIG. 3 Another embodiment of the invention is illustrated in FIG. 3.
  • the stress-relieving means 28 is positioned near the center portion of the bushing assembly.
  • the bushing assembly is illustrated with an expansion chamber 62 positioned at the end 12 of the lead tube 10.
  • the bushing assembly may not include the expansion chamber 62.
  • the stress-relieving means 28' includes a circular channel 64 having channel sides 66 and 68 and a channel bottom 70.
  • the channel sides 66 and 68 have sufficient spacing to permit telescoping of the circular channel 64 with the wall 72 of the bushing support member 24.
  • a gasket 50' is positioned between the bottom and the upper casing 20 to provide a fluidtight seal.
  • the compressed springs 38 are positioned in the circular channel 64 and exert forces on the channel bottom 70 and the bushing support member wall 72.
  • An expansion means provides a fluid-tight seal between the bushing support member 24 and the circular channel 64.
  • the expansion means comprises a flexible band 74 having an upper edge 76 attached to the circular channel 64 and a lower edge 78 attached to the bushing support member 24.
  • the band 74 flexes to permit telescoping while maintaining a fluid-tight seal.
  • the stressrelieving means 28" comprises a circular ring 80 having a slot 82 which telescopes with the bushing support member 24.
  • An outer side 84 of the circular ring 80 surrounds the bushing support member 24 and an inner side 86 supports one end of the coil spring 38".
  • the inner side 86 may not necessarily be continuous around the circular ring 80. It may only be projected from the circular ring 80 at positions where a spring 38" is located.
  • a difference in the expansion or contraction of the casing means and the lead tube 10 causes the circular ring 80 and the bushing support member 24 to telescope.
  • the circular band 74 is attached to the circular ring 80 and to the bushing support member 24 to maintain a fluidtight seal therebetween similar to the arrangement described concerning the embodiment shown in FIG. 3.
  • the flange 26 of the bushing support member 24 may be attached to the enclosure of an electrical apparatus does not change the effects of different coefficients of thermal expansion. Normal variations in lengths between the lead tube 10 and the casing means over ordinary temperature ranges is on the order of one-fourth inch for large high-voltage bushings. With the larger space for placing the springs 38' and 38" provided by the embodiments shown in FIGS. 3 and 4, more coil springs may be placed around the lead tube 10. Thus, to achieve the same axial forces, more standard sized springs may be used in place of fewer heavy duty springs as taught by the prior art which results in a manufacturing cost improvement.
  • An electrical bushing assembly comprising a lead tube, casing means including an upper casing member concentrically positioned around said lead tube, a sub stantially circular cap having an opening therein into which said lead tube extends, a substantially circular cup having a bottom with an opening therein and a flange extending outwardly from said cup, compressed coil springs each having first and second ends, the first ends of said coil springs being adjacent to said circular cap, the second ends of said coil springs being adjacent to the bottom of said circular cup, the flange of said circular cup extending between said circular cap and said upper casing member, and an O-ring positioned between the flange and said cup and said cap.
  • An electrical bushing assembly comprising a lead tube, casing means including an upper casing member concentrically positioned around said lead tube, asubstantially circular bushing support member, a telescoping member positioned with a portion thereof located between said bushing support member and said upper casing member, compressed coil springs each having first and second ends, the first ends of said coil springs being adjacent to said bushing support member, the

Landscapes

  • Housings And Mounting Of Transformers (AREA)
  • Insulators (AREA)
US00247951A 1972-04-27 1972-04-27 Electrical bushing assembly having resilient means enclosed within sealing means Expired - Lifetime US3760089A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24795172A 1972-04-27 1972-04-27

Publications (1)

Publication Number Publication Date
US3760089A true US3760089A (en) 1973-09-18

Family

ID=22937025

Family Applications (1)

Application Number Title Priority Date Filing Date
US00247951A Expired - Lifetime US3760089A (en) 1972-04-27 1972-04-27 Electrical bushing assembly having resilient means enclosed within sealing means

Country Status (5)

Country Link
US (1) US3760089A (cs)
JP (1) JPS4949196A (cs)
CH (1) CH564831A5 (cs)
GB (1) GB1430418A (cs)
SE (1) SE390231B (cs)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166194A (en) * 1977-08-10 1979-08-28 Westinghouse Electric Corp. Gas-insulated bushing with self-adjusting bushing flange seal
US4267400A (en) * 1979-06-28 1981-05-12 Mitsubishi Denki Kabushiki Kaisha Seismic bushing
US4796550A (en) * 1985-03-29 1989-01-10 Deere & Co. Single angled blade coulter and fertilizer opener
EP2117015A1 (en) 2008-05-06 2009-11-11 ABB Technology AG High voltage bushing and high voltage device comprising such bushing
EP2131371A1 (en) * 2008-06-03 2009-12-09 ABB Technology Ltd High voltage bushing, high voltage device comprising such bushing and method for cooling
CN103383884A (zh) * 2012-05-03 2013-11-06 泰科电子(上海)有限公司 绝缘子
WO2016081817A1 (en) * 2014-11-20 2016-05-26 Hubbell Incorporated Electric bushings having insulation medium retention seals
CN106486946A (zh) * 2016-12-26 2017-03-08 山东彼岸电力科技有限公司 一种复合绝缘油浸电容式穿墙套管
CN106531418A (zh) * 2016-12-26 2017-03-22 山东彼岸电力科技有限公司 一种复合绝缘油浸电容式变压器套管

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825760A (cs) * 1971-08-09 1973-04-04
DE4218171A1 (de) * 1992-06-02 1993-12-09 Siemens Matsushita Components Filtergehäuse für ein elektrisches Durchführungsfilter
GB2503187A (en) 2011-09-15 2013-12-25 Univ Sussex Composition for use in the treatment of neurodevelopmental disorders
CN105761850A (zh) * 2016-04-28 2016-07-13 句容华源电器设备有限公司 可调式绝缘子
CN108305728B (zh) * 2018-03-27 2020-04-03 安徽东盾电力有限公司 一种有机复合绝缘子
CN108955055B (zh) * 2018-07-10 2020-07-17 安徽省星年华电器有限公司 一种对吸门冰箱门封条

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2135321A (en) * 1935-10-12 1938-11-01 Ohio Brass Co High current bushing
US2228440A (en) * 1939-09-20 1941-01-14 Westinghouse Electric & Mfg Co Bushing
CH216048A (de) * 1941-01-07 1941-07-31 Micafil Ag Keramischer Mantel für Hochspannungs-Isolatoren und -Kondensatoren.
US2257652A (en) * 1939-12-16 1941-09-30 Ohio Brass Co Bushing insulator
US2853538A (en) * 1953-09-28 1958-09-23 Westinghouse Electric Corp Electrical bushings
GB841722A (en) * 1957-12-09 1960-07-20 English Electric Co Ltd Improvements in or relating to electrical bushing assemblies
FR1273425A (fr) * 1960-08-30 1961-10-13 Comp Generale Electricite Perfectionnements aux traversées pour appareils à haute tension
CA682846A (en) * 1964-03-24 General Electric Company Electrical device and method of sealing same
US3178504A (en) * 1962-04-30 1965-04-13 Westinghouse Electric Corp Pressure-cap assembly for terminal bushings

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509109U (cs) * 1973-05-23 1975-01-30

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA682846A (en) * 1964-03-24 General Electric Company Electrical device and method of sealing same
US2135321A (en) * 1935-10-12 1938-11-01 Ohio Brass Co High current bushing
US2228440A (en) * 1939-09-20 1941-01-14 Westinghouse Electric & Mfg Co Bushing
US2257652A (en) * 1939-12-16 1941-09-30 Ohio Brass Co Bushing insulator
CH216048A (de) * 1941-01-07 1941-07-31 Micafil Ag Keramischer Mantel für Hochspannungs-Isolatoren und -Kondensatoren.
US2853538A (en) * 1953-09-28 1958-09-23 Westinghouse Electric Corp Electrical bushings
GB841722A (en) * 1957-12-09 1960-07-20 English Electric Co Ltd Improvements in or relating to electrical bushing assemblies
FR1273425A (fr) * 1960-08-30 1961-10-13 Comp Generale Electricite Perfectionnements aux traversées pour appareils à haute tension
US3178504A (en) * 1962-04-30 1965-04-13 Westinghouse Electric Corp Pressure-cap assembly for terminal bushings

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166194A (en) * 1977-08-10 1979-08-28 Westinghouse Electric Corp. Gas-insulated bushing with self-adjusting bushing flange seal
US4267400A (en) * 1979-06-28 1981-05-12 Mitsubishi Denki Kabushiki Kaisha Seismic bushing
US4796550A (en) * 1985-03-29 1989-01-10 Deere & Co. Single angled blade coulter and fertilizer opener
EP2117015A1 (en) 2008-05-06 2009-11-11 ABB Technology AG High voltage bushing and high voltage device comprising such bushing
WO2009135744A1 (en) * 2008-05-06 2009-11-12 Abb Technology Ltd High voltage bushing and high voltage device comprising such bushing
EP2131371A1 (en) * 2008-06-03 2009-12-09 ABB Technology Ltd High voltage bushing, high voltage device comprising such bushing and method for cooling
CN103383884A (zh) * 2012-05-03 2013-11-06 泰科电子(上海)有限公司 绝缘子
CN103383884B (zh) * 2012-05-03 2016-03-30 泰科电子(上海)有限公司 绝缘子
WO2016081817A1 (en) * 2014-11-20 2016-05-26 Hubbell Incorporated Electric bushings having insulation medium retention seals
US10032546B2 (en) 2014-11-20 2018-07-24 Hubbell Incorporated Electric bushings having insulation medium retention seals
US10304595B2 (en) 2014-11-20 2019-05-28 Hubbell Incorporated Electric bushings having insulation medium retention seals
CN106486946A (zh) * 2016-12-26 2017-03-08 山东彼岸电力科技有限公司 一种复合绝缘油浸电容式穿墙套管
CN106531418A (zh) * 2016-12-26 2017-03-22 山东彼岸电力科技有限公司 一种复合绝缘油浸电容式变压器套管

Also Published As

Publication number Publication date
CH564831A5 (cs) 1975-07-31
JPS4949196A (cs) 1974-05-13
SE390231B (sv) 1976-12-06
GB1430418A (en) 1976-03-31

Similar Documents

Publication Publication Date Title
US3760089A (en) Electrical bushing assembly having resilient means enclosed within sealing means
US4618749A (en) Solid insulator-type vacuum switch gear
US3380009A (en) High voltage current transformer
US3391243A (en) Enclosed electric power transmission conductor
US4670625A (en) Electrical insulating bushing with a weather-resistant sheath
US4198538A (en) Suspension insulator
US7875803B2 (en) Electric bushing and a method of manufacturing an electric bushing
US3604830A (en) Space and temperature accommodating self-cleaning weather casing and high voltage insulating structure employing the same
US4007406A (en) High pressure, gas filled, variable electrical parameter device
US3178505A (en) Terminal-bushing construction
US3573342A (en) Compressed-gas-insulated high voltage electrical conductor utilizing preassembled lengths joined by field-welded expansion joints
US3883680A (en) High voltage electrical bushing incorporating a central conductor expandable expansion chamber
US4054351A (en) Connection between a device in a metallic sheath and a transformer
US2740077A (en) Electrical condensers
US4404423A (en) Three-phase gas insulated bus
US3753045A (en) Shielded metal enclosed lightning arrester
US4609775A (en) Bushing including an expansion compensation seal
US3746935A (en) Electrical bushing suitable for attachment between two electrical apparatus enclosures
US3366852A (en) Pressurized variable capacitor
US3767973A (en) Shielded metal enclosed lightning arrester
US2623919A (en) Prechargeable spring assembly for high-voltage bushings
US2746020A (en) Electric coil assembly
US1983336A (en) Pothead
US3571773A (en) Center clamped bushing transformer
US2524539A (en) Insulating bushing with flexible sheath mounting

Legal Events

Date Code Title Description
AS Assignment

Owner name: ABB POWER T&D COMPANY, INC., A DE CORP., PENNSYLV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.;REEL/FRAME:005368/0692

Effective date: 19891229