US3602629A - A high voltage-high current transformer bushing having a cast resin insulating housing and hollow central conductor containing fluid coolant - Google Patents

A high voltage-high current transformer bushing having a cast resin insulating housing and hollow central conductor containing fluid coolant Download PDF

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Publication number
US3602629A
US3602629A US5179A US3602629DA US3602629A US 3602629 A US3602629 A US 3602629A US 5179 A US5179 A US 5179A US 3602629D A US3602629D A US 3602629DA US 3602629 A US3602629 A US 3602629A
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US
United States
Prior art keywords
current carrying
carrying member
bushing
resin insulating
insulating material
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
US5179A
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English (en)
Inventor
Kevin F Friedrich
Richard D Buckley
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
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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 US3602629A publication Critical patent/US3602629A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01B17/54—Insulators or insulating bodies characterised by their form having heating or cooling devices
    • 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

Definitions

  • a high voltage-high current bushing for connecting the output from an electrical generator to the primary or low potential winding of a step up transformer.
  • the bushing comprises a hollow high current carrying member surrounded by insulating material having a ground shield embedded therein.
  • the hollow high current carrying member contains liquid coolant material which increases the thermal time constant of the bushing and tends to eliminate hot spots in the current carrying member.
  • the coolant material is maintained in a central chamberfabricated with allwelded joints which lessens the possibilityofl'eaks' which occur in the prior 'art devices-having gasketed joints;
  • the outerinsulatingcoating otlthe present invention is highly resistant'to cracks.
  • Walls are provided near th'e endsof thehollow current carrying member to provide a reservoir orchamb'erin side the hollow current carrying memberfor"retainingfli'q uid thermal cycling.
  • a stress grading or ground shield 28 is cast into the insulating member 24-and the shield 2 8 is spaced from coolant. which increases the time constant and tends to" eliminate or lessen hot spots in:thecurrentcarrying mem-be rii Means are provided near each end. ofthe hollow current-car-' rying member, beyond the insulationb'ody portion, forconnecting electrical conductors to the hollow current carrying? member.
  • FIG. 1 is a perspective view, with parts broken away,.showing a bushing as provided by this invention connecting the output of an electrical generator to the input orprimary winding DESCRIPTION OFTHE'PREFERRE'D EMBODIMENT
  • FIG. 1 is a perspective view, with parts broken away,.showing a bushing as provided by this invention connecting the output of an electrical generator to the input orprimary winding DESCRIPTION OFTHE'PREFERRE'D EMBODIMENT
  • FIG. 1 shows the environ FIG. 1 is apartially perspective view showing astep-up transformer l0 having bushings 12 as provided bythis invention mounted thereon. Although only one bushing ;12is shown in'FIG. l the transformer isequipped with three bushings l2 asprovided by this invention.
  • FIG. 1 also illustrates an electrical generator '14, with the output from each phase of the i N generator connected to one of the bushings 12 on the transformer 10 through isolated phase duct 16. The output or high voltagefrom the transformer 10 is connected to atransmission line-through three high-voltage bushings l8. As'seen'in FIG. I
  • thelbushings l2 areprotected from weather by a cover 20.
  • the output from the electrical generator 14 is usually in the order of 23,000 volts at 10,000 amperes or higher.
  • This output is connected through the isolated phase duct 16 to the bushings l2'which are connected to the low voltage orprimarywinding of the step-up transformer 10.
  • This voltage is stepped up by the transformer 10 and applied to a transmiscurrents carried by the bushing will necessarily cause high heating of the current carrying elements of the bushing. Because of thisheating, sufficient means must be built into the bushing to handle this high heat without damaging the bushing and the associated transformer.
  • FIG. 2 which shows a longitudinal sectional view of the bushing 12 provided by this invention
  • the bushing l2provided by this invention comprises a :Iarge cross se'ction'curren't carrying'niember 21. This current.
  • the current carrying member 21 may be rectangular, square. circular or triangular -in cross section and is made from'an aluminum extrusion. However it is understood that any other type of good current conducting metal and any other hollow cross section could be'used for making the current carrying member '21. In one common size bushing the current carrying'member'2l is approximately 10 inches square and approximately 44 inches long.
  • the current carrying member 21 has a serrated or rough portion 22 provided thereon near its upper end. The remainder of the lengthof the current carrying member is coated with a mold release material 23-and a resin insulator 24 is cast'onto thecurrent carrying member The serrated or roughened portion 22 of the current carrying member firmly bonds with'the cast insulatingmember 245 however, the mold release material 23f'over the remaining.
  • the shield 28 is connected byrn'eansof a conductor 30 to an insert 32 for grounding the tend beyond the ends of the insulating member 24. The ends normally be used.
  • a plurality'of holes 4'0 may be provided on all four sides of the rectangular current carrying member 21 at each end thereof to provide for the convenience of attaching leads such as 50 or 51 to any of the four sides of the current carrying member 20. This conveni'ence of connection is often important since it facilitates easy connection of the heavy stiff leads 50 and 51 to the current carrying member 21 regardless of the direction from which" the leads 50 and SI approach the current carrying member 21.
  • the terminal portions 36 and 38 of the current carrying member 21' are coated with a good tin-silver or other good low-resistance electrical connection between the leads 50 and 51 and the current carrying member21.
  • the bushing 12 is attached to the top wall 34 of the transformer by means of a plurality of bolts such as 56, which extend through bolt holes 58 in the flange portion 59 of the bushing 12 and engage threaded holes 60 in the tank wall 34.
  • metallic inserts 32 are provided inthe flange portion 54 of the bushing which receives the bolts 56 to provide ground connection between the ground shield 28 and the top wall 34 of the transformer 10.
  • a fluid tight seal is provided between the flange portion 59 of the bushing 12 and the tank wall 34 by means of a gasket 61 which is clamped tightly between the wall 34 of the transformer 10 and the flange portion 59 of the bushing 12 when the bushing is mounted on the wall 34 of the transformer 10.
  • the upper end of the hollow rectangular current carrying member 21 is closed by a metallic plate 62.
  • the plate 62 is welded, brazed or otherwise joined to the inside walls of the current carrying member 21 to provide a fluid tight connection between the plate 62 and the four sidewalls of the current carrying member 21.
  • a wall member 64 isprovided near the lower end of the current carrying member 21 to provide a fluid tight connection with the four sidewalls of the current carrying member 21.
  • Each of the walls 62 and 64 is provided with a removable screw threaded plug 66.
  • the chamber or compartment provided by the walls 62 and 64 is filled with a good coolant material to increase the thermal time constant of the bushing and to reduce the hot spot temperature of the current carrying member 21.
  • the removable plugs 66 facilitate draining and filling of the compartment 68 provided by the walls 62 and 64 and the sidewalls of the current carrying member 21 with a good grade of fluid coolant 70, such as mineral oil or the like.
  • a plurality of weather sheds 72 are cast or molded into the insulating member 24 when the insulating member 24 is cast or molded about the current carrying member 21.
  • FIG. 3 is a top view of the insulator shown in longitudinal sectional view in FIG. 2.
  • the bushing provided by this invention comprises a substantial improvement over the bushings of the prior art for connccting the output from a high voltage-high current electrical generator to the primary or low-voltage winding of a step-up transformer.
  • the bushing is of substantially lower cost than the prior art bushings and the simple construction of the bushing requires less maintenance than the prior art bushings.
  • a typical bushing constructed according to the teachings of this invention requires approximately 300 pounds of resin to form the insulating portion 24, pounds of aluminum to provide the current carrying member 21, 10 pounds of aluminum to provide the shield 28, and approximately pounds, or 13 gallons of coolant to fill the compartment 68; therefore, the bushing 12 filled with dielectric totals approximately 5 l0 pounds of material.
  • a high-current bushing comprising an elongated hollow metallic current carrying member having four sidewalls and first and second ends, resininsulating material cast around said current carrying member, said resin insulating material terminating short of said first and second ends of said current carrying member, shield means cast in said resin insulating material in spaced relationship to said current carrying member, terminal means connected to said shield means, said cast resin insulating material comprising a flange for mounting said bushing, a pair of substantially transverse wall members weldedinside said hollow current carrying member with a fluid tight joint, said transverse wall members being spaced from each other with a substantially transverse wall member adjacent each of said first and second ends of said current carrying member, said pairpf substantially transverse wall members providing a liquid tight chamber between said transverse

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US5179A 1970-01-23 1970-01-23 A high voltage-high current transformer bushing having a cast resin insulating housing and hollow central conductor containing fluid coolant Expired - Lifetime US3602629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US517970A 1970-01-23 1970-01-23

Publications (1)

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US3602629A true US3602629A (en) 1971-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
US5179A Expired - Lifetime US3602629A (en) 1970-01-23 1970-01-23 A high voltage-high current transformer bushing having a cast resin insulating housing and hollow central conductor containing fluid coolant

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US (1) US3602629A (Direct)
JP (1) JPS501434B1 (Direct)
FR (1) FR2077288B3 (Direct)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792191A (en) * 1972-12-26 1974-02-12 Ite Imperial Corp Enclosure for conductor of electrical transmission system
US4458101A (en) * 1982-04-08 1984-07-03 Westinghouse Electric Corp. Gas-insulated epoxy bushing having an internal throat shield and an embedded ground shield
US5281767A (en) * 1992-10-30 1994-01-25 A.B. Chance Company Reduced mechanical stress bushing and conductor rod assembly
US6239682B1 (en) 1999-06-09 2001-05-29 Square D Company Insert for expandable transformer enclosure
US20100294562A1 (en) * 2009-05-25 2010-11-25 Abb Technology Ag Electrical conductor for a high-current bushing
US20130036838A1 (en) * 2011-08-09 2013-02-14 H. Waite H. Dykes, JR. Sampling Adapter
WO2017137193A1 (de) * 2016-02-09 2017-08-17 Siemens Aktiengesellschaft Hochspannungsvorrichtung
US11139711B2 (en) * 2018-10-31 2021-10-05 Mitsubishi Power, Ltd. Rotating electrical machine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792191A (en) * 1972-12-26 1974-02-12 Ite Imperial Corp Enclosure for conductor of electrical transmission system
US4458101A (en) * 1982-04-08 1984-07-03 Westinghouse Electric Corp. Gas-insulated epoxy bushing having an internal throat shield and an embedded ground shield
US5281767A (en) * 1992-10-30 1994-01-25 A.B. Chance Company Reduced mechanical stress bushing and conductor rod assembly
US6239682B1 (en) 1999-06-09 2001-05-29 Square D Company Insert for expandable transformer enclosure
US20100294562A1 (en) * 2009-05-25 2010-11-25 Abb Technology Ag Electrical conductor for a high-current bushing
EP2256753A1 (de) * 2009-05-25 2010-12-01 ABB Technology AG Stromleiter für eine Hochstromdurchführung
RU2521963C2 (ru) * 2009-05-25 2014-07-10 Абб Текнолоджи Аг Электрический проводник сильноточного проходного изолятора
US8952257B2 (en) * 2009-05-25 2015-02-10 Abb Technology Ag Electrical conductor for a high-current bushing
US20130036838A1 (en) * 2011-08-09 2013-02-14 H. Waite H. Dykes, JR. Sampling Adapter
US9568400B2 (en) * 2011-08-09 2017-02-14 Streamline Automation Llc Sampling adapter
WO2017137193A1 (de) * 2016-02-09 2017-08-17 Siemens Aktiengesellschaft Hochspannungsvorrichtung
US11139711B2 (en) * 2018-10-31 2021-10-05 Mitsubishi Power, Ltd. Rotating electrical machine

Also Published As

Publication number Publication date
JPS501434B1 (Direct) 1975-01-17
FR2077288A7 (Direct) 1971-10-22
FR2077288B3 (Direct) 1973-10-19

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