US3610813A - Tubular oil filled electric bushing with sealing means - Google Patents

Tubular oil filled electric bushing with sealing means Download PDF

Info

Publication number
US3610813A
US3610813A US32114A US3610813DA US3610813A US 3610813 A US3610813 A US 3610813A US 32114 A US32114 A US 32114A US 3610813D A US3610813D A US 3610813DA US 3610813 A US3610813 A US 3610813A
Authority
US
United States
Prior art keywords
tap
end seal
pin
connection
resilient
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
US32114A
Other languages
English (en)
Inventor
Sven Linderholm
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 Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3610813A publication Critical patent/US3610813A/en
Anticipated expiration legal-status Critical
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
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/22—Cable terminations
    • 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
    • H01B17/34—Insulators containing liquid, e.g. oil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955—Locked bolthead or nut
    • Y10S411/956—Automatic base clutch
    • Y10S411/96—Friction

Definitions

  • ABSTRACT An oil filled electric bushing consists of an elongated, tubular insulator, through which an electric conductor extends.
  • the conductor is provided at one of its ends with a terminal assembly comprising an inner tap firmly joined to the conductor and an external tenninal tap threaded on to the inner tap and pressed against an end seal member.
  • a resilient tubular locking pin holds the inner tap in a fixed position in relation to the end seal member.
  • the present invention relates to an electric bushing comprising an elongated tubular insulator provided with an end seal member and having a centrally located electric conductor extending through said insulator.
  • the electrical conductor is provided at one of its ends with a terminal assembly comprising an inner connection tap and an outer terminal tap.
  • the connection tap is firmly connected to the conductor and provided with an external screw thread, whereas the terminal tap is provided with an internal screw thread and threaded on to said connection tap so that it is axially pressed against said end seal member.
  • a locking member is arranged to hold the inner connection tap in a fixed position in relation to the end seal member.
  • Connection of outer conductors to the terminal tap can be made, for instance through a terminal plate, which is attached to the terminal tap by means of clamp members, suitable for this purpose.
  • connection assemblies of said type are used to a great extent, for instance for transformers, and, generally, they work satisfactorily during normal operating conditions.
  • connection assembly is subjected to variations of temperature, vibrations or torque, transmitted from the outer conductor, there is a risk that the screw joint between the inner and outer tap may loosen, resulting in the disappearance of the contact force between the taps. This may result in abnormal heating of the connection assembly, and in certain cases disturbances in the normal operation may occur.
  • the purpose of the invention is to obtain an effective locking of the screw joint between the two taps in the connection assembly so that the previously mentioned risks of disturbances are eliminated.
  • the locking should be such that it prevents turning of, or makes it difficult to turn, the terminal tap. Furthermore, a satisfactory electric contact should be obtained even during initial turning.
  • this is achieved by making the locking member, which normally is used to hold the inner connection tap in a fixed position in relation to the end seal member, resilient in the longitudinal direction of the terminal tap.
  • the condenser bushing shown in FIG. 1 consists of an elongated tubular insulating member 1 with an inner bushing tube 2, made of aluminum, through which a conductor 3 extends.
  • the end of the bushing is provided with a connection assembly consisting of an inner tap 4 (called the connection tap) with an outer screw thread, and an outer tap 5 (called the terminal tap) with an inner screw thread.
  • the inner top 4 is finnly connected with the conductor 3, for instance through brazing or contact pressing. Further, the inner tap 4 is locked to the bushing tube 2 by means of a resilient locking pin 6.
  • a terminal plate For connection of outer conductors to the bushing a terminal plate, not shown, is attached to a terminal tap 5.
  • the terminal tap 5 When the terminal tap 5 is threaded on to the connection tap 4, it is pressed against an end seal member consisting of a nut 7 and a flange 8.
  • a resilient force is obtained simultaneously, resulting in an efiective locking of the screw joint between the inner tap 4 and the outer tap 5.
  • the locking pin maintains the contact force even in the case where the outer tap is subjected to a certain torque tending to loosen the screw joint.
  • Test under working conditions have shown that the connection has considerably better properties in this respect than corresponding previously known embodiments in which a cylindric, nonresilient, locking pin was used.
  • the bushing is filled with oil and, there fore, a seal 9 in the form of a so-called O-ring is arranged between the terminal tap 5 and the nut 7.
  • FIGS. 2 and 3 show how the resilient locking pin 6 is constructed. It consists of two resilient tube pins 10 and ll of different diameters, the smaller pin 10 being pressed into the bigger one so that the slits l2 and 13 of the pins are displaced in relation to each other.
  • the resilient locking member can be constructed in several different ways within the scope of the invention. It would be possible, for instance, to use one single resilient tube pin, provided this has suitably resilient properties, instead of using two tube pins. In such a case it could be desirable to have a certain direction of the slits of the resilient pin. This can easily be made by means of a guiding pin, which is placed in a preferably radial hole in the connection tap, thus engaging with the slit, so that the tube pin comes to a fixed position.
  • the end seal member can be constructed in many different ways. For instance, it can be provided with a resilient member in order to maintain the necessary sealing pressure at different temperatures of the bushing.
  • An electric bushing comprising an elongated tubular insulating member (1), said insulating member being provided with an end seal member (7,8), a centrally located electrical conductor (3) extending through said insulating member, said electrical conductor at one of its ends being provided with a terminal assembly comprising an inner connection member (4), said connection member being firmly connected to said conductor (3) and provided with an external screw thread; an outer terminal member (5) provided with an internal screw thread and threaded on to said connection member (4), the terminal member (5) being axially pressed against said end seal member (7,8), a locking member (6) holding said inner connection member (4) in a fixed position in relation to said end seal member (7,8), said locking member (6) being resilient in the longitudinal direction of said connection member (4), whereby to cause said outer terminal member to press against said seal member.
  • a bushing according-.toclaim 1', in which said locking Surrounds Said connection member and is arranged in a member (6) comprises two concentric resilient tubular pins fixed position in relation to said end seal member (73) said (10,11), each provided with a longitudinal slit (12,13), one of locking member (6) comprising a pin arranged in radial holes v I said pins (10) being pressedmtothe other pin (11) with said through said connection member (4) and said metal tube (2).
  • sms (12.13) turned in op itedirections.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Housings And Mounting Of Transformers (AREA)
US32114A 1969-04-30 1970-04-27 Tubular oil filled electric bushing with sealing means Expired - Lifetime US3610813A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE6221/69*A SE320118B (en, 2012) 1969-04-30 1969-04-30

Publications (1)

Publication Number Publication Date
US3610813A true US3610813A (en) 1971-10-05

Family

ID=20268168

Family Applications (1)

Application Number Title Priority Date Filing Date
US32114A Expired - Lifetime US3610813A (en) 1969-04-30 1970-04-27 Tubular oil filled electric bushing with sealing means

Country Status (2)

Country Link
US (1) US3610813A (en, 2012)
SE (1) SE320118B (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355901A1 (de) * 1972-06-21 1974-05-30 Raychem Corp Thermisch verformbarer befestigungsstift
US3913444A (en) * 1972-11-08 1975-10-21 Raychem Corp Thermally deformable fastening pin

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1691328A (en) * 1922-08-03 1928-11-13 Ohio Brass Co Terminal for insulator bushings
US1728952A (en) * 1922-07-29 1929-09-24 Ohio Brass Co Conductor terminal for bushings
US2109368A (en) * 1936-09-15 1938-02-22 Gen Electric High voltage bushing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1728952A (en) * 1922-07-29 1929-09-24 Ohio Brass Co Conductor terminal for bushings
US1691328A (en) * 1922-08-03 1928-11-13 Ohio Brass Co Terminal for insulator bushings
US2109368A (en) * 1936-09-15 1938-02-22 Gen Electric High voltage bushing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2355901A1 (de) * 1972-06-21 1974-05-30 Raychem Corp Thermisch verformbarer befestigungsstift
US3913444A (en) * 1972-11-08 1975-10-21 Raychem Corp Thermally deformable fastening pin

Also Published As

Publication number Publication date
SE320118B (en, 2012) 1970-02-02

Similar Documents

Publication Publication Date Title
US3201721A (en) Coaxial line to strip line connector
US3380009A (en) High voltage current transformer
US3352963A (en) High pressure, high temperature electrical lead-through fitting
US3209287A (en) Electrical coaxial cable connecting assembly with impedance matching
US2361215A (en) Sealed cable entrance
US2376725A (en) End seal for transmission lines
US3610813A (en) Tubular oil filled electric bushing with sealing means
US2550112A (en) Sealed terminal bushing
US3848955A (en) Electrical connector for tapping a concentric electrical cable
US2931009A (en) Electrical connector
US2937359A (en) Power factor tap for high voltage bushing
US4404423A (en) Three-phase gas insulated bus
US5416266A (en) Encased gas-insulated high-tension installation and an assembly of such an installation
US2278974A (en) Bushing for encased electrical apparatus
US2315623A (en) Insulating bushing
US3319211A (en) Electrical connector
US4214118A (en) Electrical bushing
US2195003A (en) Insulating bushing
US3335215A (en) Stress relief apparatus
US2462227A (en) Connector
US2300195A (en) Electrical apparatus
SU580607A1 (ru) Кабельное соединение дл электродуговой сварки в среде защитных газов
US2859271A (en) High voltage bushing
US3218412A (en) High pressure current limiting device
US2060757A (en) Connecter