US3242251A - Bushing device for introducing current conductor into compressed gas switch chambers - Google Patents

Bushing device for introducing current conductor into compressed gas switch chambers Download PDF

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Publication number
US3242251A
US3242251A US292543A US29254363A US3242251A US 3242251 A US3242251 A US 3242251A US 292543 A US292543 A US 292543A US 29254363 A US29254363 A US 29254363A US 3242251 A US3242251 A US 3242251A
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US
United States
Prior art keywords
tension
housing
conductor rod
tube
surrounding
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
US292543A
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English (en)
Inventor
Floessel Dieter
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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
Priority claimed from CH829462A external-priority patent/CH395222A/de
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3242251A publication Critical patent/US3242251A/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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H01B17/301—Sealing of insulators to support
    • 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
    • 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
    • H01B17/36—Insulators having evacuated or gas-filled spaces

Definitions

  • the present invention refers to an electrical bushing in particular for the introducing of current into the interr'upter-chamber of a gas-pressure circuit breaker.
  • circuit breakers whose interrupter-chambers comprise of a metallic housing filled with gas under pressure, in which the interrupter-contacts are located whereby the movable contact is electrically connected to the metallic housing and the stationary contact is carried by a con ductor, said conductor must be led into the housing of the interrupter-chamber in such a way that it is insulated from the housing.
  • the conductor is contained within a hollow insulator and the combination of conductor and insulator constitutes a bushing.
  • the fittings mounted on the insulator necessitate also an increase in height of the insulator if a definite length of creepage path or a definite gap length between metal parts is prescribed. i g
  • the invention has the purpose, among others, of providing an arrangement for a bushing in which "the 1161 low insulator is subjected to compressive stresses only, while the height of the bushing is reduced to a minimum.
  • the bushing consist of at least one hollow insulator and one insulating tension-tube, which is contained within the hollow insulator and which surrounds the'eondu'ctor' at least in part, and that elastic means be provided through which the tension-tube is connected to both the fixing and terminal flanges;
  • RIG. 1 shows, partly in section, a. bushing according to the invention.
  • FIG. 2 shows a further example of construction.
  • the conductor is designated with 1 and extends through a longitudinal bore in. the insulator 2.
  • the latter is connected on its upper end to a flange 3 which in turn, is rigidly connected to -a housing 4 of the interrupter-chamber.
  • the flange 3 carries a tapered shoulder 3a on its inside surface to support the insulating.
  • the tension-tube 5 which has a corresponding tapered shoulder 5a on its upper end engaging shoulder 3a.
  • the tension-tube 5 is made of a high-strength insulating material with fibre-reinforcement.
  • the tension-tube 5 On its lower end the tension-tube 5 has a further tapered 3,242,251 Patented Mar. 22, 1966 shoulder 5b which is a corresponding tapered shoulder 6a on the tension-sleeve 6.
  • the tension-sleeve 6 is rigidly connected to the conductor 1 by means of a cross pin 7.
  • Sleeve 6 is fitted with a screw thread to engage the nut 8.
  • a tapered insulating sleeve 13 is provided as a strut for the conductor 1 within the tension-tube 5. To prevent axial movement, the insulating sleeve 13 is rigidly joined to the tension-tube 5 at position 14 by means of an adhesive connection. By reason of the tapered shape of sleeve 13 a large creepage path is provided between flange 3 and the conductor 1.
  • a cylindrical electrode 15 of conducting material which serves to control the electric field, is inserted in the flange 3 between insulator 2 and tension-tube 5 and, in the usual manner, as a projecting electrode, relieves the region in which the flange 3 and the conductor 1 are close together at the entrance to the housing 4 of the interrupter-cham ber.
  • the housing 4 which is filled with gas under pressure, is connected to the inside of the hollow insulator 2.
  • the flange 12 is providedwith a connecting nipple 17 while the sleeve 6 is provided with an opening 18 and axially extending cavities 19, by means of which the gas flows through the H bushing into the interrupter chamber.
  • the intermediate layer of material 20 ensures that the nut 8 is not tightened too rigidly.
  • the, disc springs 11 must be designed for a fairly large compressive force in order to ensure that the sealing between the bearing surfaces of the hollow insulator and the end flanges is always maintained even when the above mentioned changes in length occur.
  • the disc springs 11 may then be designed essentially weaker because they would only need to maintain the sealing during the time when the bushing is not under internal gas-pressure.
  • the hollow. insulator is then closed at its lower end by an annular in cylinder in which a movable piston, secured to the conductor, is situated. While the piston is capable of movement within its cylinder it nevertheless maintains a seal, and the cylinder exerts an additional force on the hollow insulator because of the gas pressure existing in the bushing.
  • FIG. 2 shows an arrangement of such a bushing in section.
  • the conductor 101 is connected through. the insulating tube 105, which is provided with tapered shoulders, to the housing 103 of the interrupter-chamber.
  • the tension-tube is surrounded concentrically by the hollow insulator 102 which in turn is in contact at its upper end surface with the housing 103 and at its lower end surface with an annular cylinder 104.
  • sealing rings 109 are provided which lie in the usual circular slots.
  • the piston 106 is supported in a sliding air-tight manner and is held rigidly against a collar 101b by means of the nut 107.
  • This collar 101b is a bell-shaped widening of the conductor 101.
  • the pre-stressed disc springs 108 act in the space between the piston 106 and cylinder 104.
  • the space between the tension-tube 105 and the hollow insulator 102 is always connected to the space within the interrupter-chamber of the breaker through the opening 110 in the housing 103.
  • the conductor 101 is fitted On its lower end with a terminal bolt 101a.
  • the arrangement as shown in FIG. 2 operates so that when the bushing is not under internal pressure, the forces on the hollow insulator 102 are brought about by the pre-stressed disc springs 108. If the interrupterchamber and hence, also the bushing is now filled with pressurized gas, the pressure between the parts 102 and 103 and between the parts 102 and 104 increases with increase in gas-pressure because now a force, given by the product of the gas-pressure and the effective annular area a, is produced. This force is maintained even when unequal expansions due to heating take place in the parts 102 and 105 during service because the piston 106, which is rigidly connected to the conductor 101, isfree to move axially within cylinder 104. In this way the hollow insulator 102 may be made of porcelain and the tensiontube 105 may be made of polyester i.e. materials which have vastly different coefficients of expansion, without adversely affecting the sealing of the bushing. I
  • the hollow insulator may, for example, consist of several parts which are axially pressed together in the same way by means of a tension-tube whereby circular intermediate plates are arranged between the individual constituent pieces.
  • a further advantage of the new arrangement is that in the event of possible internal over-pressures, such as those arising from disturbances in the interrupter-chamben an explosive bursting of the hollow insulator is avoided by reason maggot the protective tension-tube and also only a' small volume of gas exists between tension-tube sulator.
  • the combination comprising a gas-filled metallic housing within which the circuit breaker contacts are located, said housing including an opening through which a rigid conductor rod passes to the exterior of the housing from one of said con tact members, and a bushing structure surrounding said conductor rod exteriorly of said housing for insulating said conductor rod from said housing, said bushing structure comprising an outer hollow ceramic insulator surrounding said conductorrod and having one end thereof bearing against said housing adjacent said opening, a tension tube of insulating material surrounding said conductor rod and located in the annular space between said conductor rod and ceramic insulator, means adjacent said housing opening for securing the corresponding end of said tension tube against movement, a metallic tension sleeve secured to said conductor rod adjacent the opposite end of said ceramic insulator, means securing the other end of said tension tube to said tension sleeve, a tightening nut'threaded onto a threaded portion of said tension sleeve, an annulan fitting member carried by and surrounding said tension s
  • tension sleeve includes an opening through the wall thereof and said annular fitting member also includes an open ing through the wall thereof for admitting a pressurized gas into said metallic housing through said bushing structure.
  • the combination comprising a gas-filled metallic housing within which the circuit breaker contacts are located, said housing including an opening through which a rigid conductor rod passes to the exterior of the housing from one of said contact members, and a bushing structure surrounding said conductor rod exteriorly of said housing for insulating said conductor rod from said housing, said bushing structure comprising an outer hollow ceramic insulator surrounding said conductor rod and having one end thereof bearing against said housing adjacent said opening, a tension tube of insulating material surrounding said conductor rod and located in the annular space between said conductor rod and ceramic insulator, means adjacent said housing opening for securing the corresponding end of said tension tube against movement, means securing the other end of said tension tube to said conductor rod, an annular cylinder surrounding said tension tube and in contact with said opposite end of said ceramic insulator, an annular piston slidable within said annular cylinder, means securing said piston to said conductorrod, and spring means located in said annular cylinder be tween said piston and the

Landscapes

  • Insulators (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US292543A 1962-07-10 1963-07-03 Bushing device for introducing current conductor into compressed gas switch chambers Expired - Lifetime US3242251A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH829462A CH395222A (de) 1962-07-10 1962-07-10 Elektrische Durchführung
CH1492262A CH409040A (de) 1962-07-10 1962-12-20 Elektrische Durchführung

Publications (1)

Publication Number Publication Date
US3242251A true US3242251A (en) 1966-03-22

Family

ID=25703116

Family Applications (1)

Application Number Title Priority Date Filing Date
US292543A Expired - Lifetime US3242251A (en) 1962-07-10 1963-07-03 Bushing device for introducing current conductor into compressed gas switch chambers

Country Status (5)

Country Link
US (1) US3242251A (de)
JP (1) JPS515195B1 (de)
CH (1) CH409040A (de)
FR (1) FR1362325A (de)
GB (1) GB971861A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541220A (en) * 1967-09-08 1970-11-17 Furukawa Electric Co Ltd Reinforced long porcelain bushing
WO1995022158A1 (en) * 1994-02-14 1995-08-17 Abb Power T & D Company Inc. High performance circuit breaker with independent pole operation linkage and conical composite bushings
US5576523A (en) * 1994-02-14 1996-11-19 Abb Power T&D Company, Inc. Independent pole operation linkage
US20130025912A1 (en) * 2010-04-21 2013-01-31 Roland Hoefner High-voltage insulator
WO2017174271A1 (de) * 2016-04-04 2017-10-12 Siemens Aktiengesellschaft Hohlisolator und hochspannungsschalter mit einem hohlisolator
CN107305804A (zh) * 2016-04-20 2017-10-31 泰科电子(上海)有限公司 绝缘子及其制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014967B1 (de) * 1979-02-16 1983-12-14 Mitsubishi Denki Kabushiki Kaisha Durchführungshülle
DE19508973C2 (de) * 1995-03-13 2002-04-04 Abb Patent Gmbh Kabelgarnitur mit einem ein Kabel hülsenartig umschließenden Druckschieber

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770130A (en) * 1926-05-27 1930-07-08 Russell P Dunmire Insulator
CH218749A (de) * 1940-12-06 1941-12-31 Bbc Brown Boveri & Cie Stützisolator für mit Druckgas arbeitende Schalter.
US2534920A (en) * 1945-04-30 1950-12-19 Westinghouse Electric Corp Circuit interrupter
CA512217A (en) * 1955-04-26 Schindler Carl Static free bushing
US2930841A (en) * 1957-01-16 1960-03-29 Gen Electric Sealing arrangement for electrical insulating bushings
US3178505A (en) * 1962-05-09 1965-04-13 Westinghouse Electric Corp Terminal-bushing construction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA512217A (en) * 1955-04-26 Schindler Carl Static free bushing
US1770130A (en) * 1926-05-27 1930-07-08 Russell P Dunmire Insulator
CH218749A (de) * 1940-12-06 1941-12-31 Bbc Brown Boveri & Cie Stützisolator für mit Druckgas arbeitende Schalter.
US2534920A (en) * 1945-04-30 1950-12-19 Westinghouse Electric Corp Circuit interrupter
US2930841A (en) * 1957-01-16 1960-03-29 Gen Electric Sealing arrangement for electrical insulating bushings
US3178505A (en) * 1962-05-09 1965-04-13 Westinghouse Electric Corp Terminal-bushing construction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541220A (en) * 1967-09-08 1970-11-17 Furukawa Electric Co Ltd Reinforced long porcelain bushing
WO1995022158A1 (en) * 1994-02-14 1995-08-17 Abb Power T & D Company Inc. High performance circuit breaker with independent pole operation linkage and conical composite bushings
US5576523A (en) * 1994-02-14 1996-11-19 Abb Power T&D Company, Inc. Independent pole operation linkage
US20130025912A1 (en) * 2010-04-21 2013-01-31 Roland Hoefner High-voltage insulator
US9601240B2 (en) * 2010-04-21 2017-03-21 Maschinenfabrik Reinhausen Gmbh High-voltage insulator
WO2017174271A1 (de) * 2016-04-04 2017-10-12 Siemens Aktiengesellschaft Hohlisolator und hochspannungsschalter mit einem hohlisolator
CN107305804A (zh) * 2016-04-20 2017-10-31 泰科电子(上海)有限公司 绝缘子及其制造方法
CN107305804B (zh) * 2016-04-20 2023-05-02 泰科电子(上海)有限公司 绝缘子及其制造方法

Also Published As

Publication number Publication date
JPS515195B1 (de) 1976-02-18
GB971861A (en) 1964-10-07
FR1362325A (fr) 1964-05-29
CH409040A (de) 1966-03-15

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