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EP0971378B1 - Isolatorbuchse - Google Patents

Isolatorbuchse Download PDF

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Publication number
EP0971378B1
EP0971378B1 EP99112778A EP99112778A EP0971378B1 EP 0971378 B1 EP0971378 B1 EP 0971378B1 EP 99112778 A EP99112778 A EP 99112778A EP 99112778 A EP99112778 A EP 99112778A EP 0971378 B1 EP0971378 B1 EP 0971378B1
Authority
EP
European Patent Office
Prior art keywords
insulating body
tank
tie
bushing insulator
external
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
EP99112778A
Other languages
English (en)
French (fr)
Other versions
EP0971378A1 (de
Inventor
Silvio Dal Lago
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.)
Comem SpA
Original Assignee
Comem SpA
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Filing date
Publication date
Application filed by Comem SpA filed Critical Comem SpA
Publication of EP0971378A1 publication Critical patent/EP0971378A1/de
Application granted granted Critical
Publication of EP0971378B1 publication Critical patent/EP0971378B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01B17/265—Fastening of insulators to support

Definitions

  • the present invention relates to an improved bushing insulator of the type used for low voltages (1 to 3 kV) and for currents from 100 to 6500 A, to be applied, for example, to the tank of a transformer.
  • the bushing insulators allow a live electrical conductor to pass through an obstacle, constituted for example by the tank of a transformer, ensuring a seal in terms of electrical voltage between the free end of the conductor and the point where the bushing insulator is anchored on the tank, with values which are sufficiently high with respect to the operating values.
  • the bushing insulators are currently constituted by a tie which acts as an electrical conductor, passes axially through an insulating part exposed to the air and located outside the tank and then engages and passes through an opening formed in the surface of the tank with an insulating part arranged inside the tank.
  • the insulating parts of the bushing insulator both the one that remains inside the tank and the one to be arranged externally, are made of ceramic material, preferably porcelain.
  • Porcelain in fact has characteristics adapted for insulation, because it ensures high rigidity, good mechanical strength and also good resistance to temperature variations.
  • the ceramic material is used in a mixture which is designed appropriately from the point of view of the composition and of the heat treatment to which it must be subjected.
  • the layer must have the same expansion coefficient as the porcelain, otherwise in the course of time surface cracks tend to form which may lead to the breakage of the insulator as they deepen.
  • the aim of the present invention is to provide a bushing insulator which solves the above-mentioned drawbacks of conventional types.
  • a consequent primary object of the present invention is to provide a bushing insulator of the type for low voltages, with values between 1 and 3 kV and for currents between 100 and 6500 A, which can be handled without requiring any particular care and which at the same time ensures improved insulation characteristics with respect to those ensured by conventional bushing insulators.
  • a further important object of the present invention is to provide a bushing insulator which can be obtained by assembling a smaller number of components than conventional types.
  • a further object is to provide a bushing insulator which allows to considerably simplify all the operations for its assembly and disassembly.
  • a further object is to provide a bushing insulator which requires no particular maintenance.
  • a further object is to provide a bushing insulator for low voltages which can be obtained at a significantly lower cost than conventional models.
  • a further object is to provide a bushing insulator whose constructive configuration can be obtained in practice by resorting to per se known processes.
  • a further object of the present invention is to provide a bushing insulator which ensures greater impact resistance than conventional types and can thus be handled without requiring any special care or attention.
  • an electric transformer is generally designated by the reference numeral 10 and has a tank with radiators 11 to which high-voltage insulators 12 and low-voltage bushing insulators, generally designated by the reference numeral 13, are fixed at the upper part.
  • Each one of the low-voltage insulators 13 is of the type for low voltages (1 to 3 kV and currents from 100 to 6500 A) and is fixed to the upper part of the tank 11 at an opening 14 formed thereon.
  • Each bushing insulator 13 is predominantly elongated longitudinally and comprises a metallic tie 15 which is arranged along the main elongation axis 16, acts as an electrical conductor and has a threaded lower end 17 and a threaded upper end 18.
  • the tie 15 in the working configuration has an upper end 18 which remains outside the tank and a lower end 17 which, after passing through the opening 14, remains inside the tank 11.
  • Each bushing insulator 13 is provided with a part to be exposed to the air, which is generally designated by the reference numeral 19 and is crossed axially by the tie 15.
  • the part 19 to be exposed to the air comprises nuts 20 which are packed together and stacked starting from the upper end 18 of the tie 15, are internally threaded and lie above a hood 22.
  • the hood is substantially umbrella-shaped and is perforated in its central part, so that it is crossed by the tie 15.
  • the hood 22 is made of plastics, preferably a mix constituted by 70% of a material known as PBT and 30% glass fiber, and has excellent mechanical characteristics in terms of impact resistance and resistance to the direct action of weather.
  • the hood 22 can be made of a different material having equivalent physical and chemical characteristics.
  • annular gasket 23 of a per se known type (see Figure 3) which in this case has a semicircular transverse cross-section, with the flat part arranged internally at the tie 15.
  • annular gasket 23 ensures the seal in the axial direction and simultaneously in the radial direction as well.
  • the hood 22 is conveniently chamfered at the region in contact with the annular gasket 23.
  • an external insulating body 24 which is substantially bell-shaped and has a central through hole 25 through which the tie 15 passes.
  • a tubular extension 26 protrudes monolithically from the lower part of the external insulating body 24 and is coaxial to the through hole 25; its radial dimensions are smaller than the remaining part of the external insulating body 24 and are substantially complementary to the opening 14, so that it can be inserted in the tank 11.
  • the external insulating body 24 is made of plastics, and in this configuration it is obtained with a mixture constituted by 70% polyamide and 30% glass fiber.
  • the external insulating body 24 has excellent characteristics in terms of resistance to impacts and to the effects of weather.
  • the external insulating body 24 can be made of materials other than the above-mentioned one, provided that they have adequate mechanical and chemical characteristics.
  • the external insulating body 24 is to be packed against the upper part of the tank 11 at an annular portion 27 which is delimited externally by the bell-like shape and internally by the tubular extension 26.
  • a flat annular gasket 28 is interposed between the annular portion 27 and the tank 11, outside the opening 14, and has a rectangular cross-section; its outside diameter is conveniently smaller than the annular portion 27, so that the annular portion becomes a containment seat which protects it from the direct action of the weather when, in the operating configuration, it is packed together with the other components of the part 19 to be exposed to the air of the bushing insulator 13.
  • the bushing insulator 13 further comprises a part to be arranged inside the tank, which is designated by the reference numeral 29 and is constituted by an internal insulating body 30 which has, in this case, a structure which internally has a substantially hollow hexagonal transverse cross-section so as to allow the insertion of the tubular extension 26.
  • the internal insulating body 30 is to be placed in abutment against the inner face of the tank 11, while the lower end is provided with a bottom 31 which is monolithic therewith and forms a plane which is perpendicular to the longitudinal main axis 16.
  • a tubular tang 32 protrudes monolithically from the bottom 31 toward the inside of the insulating body 30 and wraps around the threaded lower end 17 of the tie 15.
  • the anchoring of the internal insulating body 30 to the tie 15 is particularly stable thanks to the presence of the thread in the lower end 17 surrounded by the tang 32.
  • the grip of the internal insulating body 30 on the tie 15 can be ensured by providing an adequate punching on the tie 15.
  • the internal insulating body 30, in this particular embodiment, is made of plastics by overmolding on the tie 15, so that the body and the tie form in practice a single part.
  • the internal insulating body 30 can be provided as a separate part by molding.
  • the internal insulating body 30 is made, in this case, of a plastic material which is resistant to the oils used inside the tanks 11 of transformers.
  • the bushing insulator 13 no longer needs to resort to a washer, to be fixed to the tie by brazing, tinning or punching, in order to lock the internal insulating part 29 at the lower end 17.
  • the hood 22 protects the annular gasket 23, whose operating life can therefore be much longer than in conventional bushing insulator models.
  • the plastics used to provide the hood 22, the external insulating body 24 and internal insulating body 30 ensures optimum characteristics in terms of rigidity and mechanical impact resistance.
  • bushing insulators executed according to the present invention in fact ensure better electrical insulation than conventional types.
  • a further important advantage consists in that a bushing insulator has been provided which is obtained by assembling a reduced number of components with respect to conventional types.
  • a further advantage consists in that a bushing insulator has been provided which allows to considerably simplify all assembly and disassembly operations.
  • a further advantage of the present invention consists in that a bushing insulator has been provided which requires no particular maintenance thanks to sealing gaskets which are practically shielded from the direct action of the weather.
  • the present invention has provided a bushing insulator for low voltages (1 to 3 kV) which benefits from the fact that it can be obtained at a significantly lower cost than conventional models.
  • a further advantage consists in that a bushing insulator has been provided whose constructive configuration is obtained in practice by resorting to per se known processes.
  • a further embodiment can be obtained by providing, between the annular portion 27 and said tank 11, outside the opening 14 and as an alternative to the flat annular gasket 28, a flat rubber-cork gasket of the incompressible type.
  • a still further embodiment is possible if a flat gasket, for example of the kind made of a material known as NBR, combined with a rubber-cork gasket, is interposed between the annular portion 27 and the tank 11.
  • a flat gasket for example of the kind made of a material known as NBR, combined with a rubber-cork gasket, is interposed between the annular portion 27 and the tank 11.
  • the materials employed, so long as they are compatible with the contingent use, as well as the dimensions, may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Insulating Bodies (AREA)
  • Cable Accessories (AREA)

Claims (10)

  1. Durchführungsisolator (13) zur Anwendung zwischen einem elektrischen Leiter und einem Tank (11) eines Transformators (10) oder einem anderen gleichwertigen Körper von der für niedrige Spannungen gedachten Art, umfassend einen der Luft auszusetzenden Teil (19), der mit einem innerhalb des Tanks anzuordnenden Teil (29) gekoppelt ist, wobei die Teile von einem Verbindungsstück (15) axial durchquert werden, welches als elektrischer Leiter wirkt und welches ein mit Gewinde versehenes oberes Ende (18) aufweist, das außerhalb des Tanks bleibt, und ein mit Gewinde versehenes unteres Ende (17), welches nach Hindurchtreten durch eine Öffnung (14) des Tanks (11) innerhalb des Tanks (11) bleibt, wobei der der Luft auszusetzende Teil (19) - auf das Verbindungsstück (15) gepackt - umfasst: eine Ringdichtung (23), eine Haube (22), einen äußeren Isolierkörper (24) und eine zwischen dem äußeren Isolierkörper (24) und dem Tank (11) des Transformators (10) an einer korrespondierenden Öffnung (14) angeordnete Dichtung (28), wobei der innerhalb des Tanks anzuordnende Teil (29) einen inneren Isolierkörper (30) umfasst, welcher zwischen dem äußeren Isolierkörper und einem mit dem Verbindungsstück (15) fest verkoppelten Teil angreift, wobei die Haube (22) und sowohl der äußere Isolierkörper (24) als auch der innere Isolierkörper (30) aus Kunststoff hergestellt sind, dadurch gekennzeichnet, dass die Haube (22) im Wesentlichen schirmförmig ist, um so die Ringdichtung (23) und den äußeren Isolierkörper (24) zu bedecken und zu schützen, und dass der äußere Isolierkörper (24) glockenförmig ist und in Axialrichtung mit einem Durchgangsloch (25) und mit einer rohrförmigen Verlängerung (26), welche von dem unteren Ende des glockenförmigen Bereichs vorsteht, versehen ist, wobei der äußere Isolierkörper (24) einen Außendurchmesser aufweist, der eine zu der Öffnung (14) und zu dem Innendurchmesser des inneren Isolierkörpers (30) komplementäre Gestalt aufweist, und dass an dem der Luft ausgesetzten Teil (19) des Verbindungsstücks (15) Muttern (20) bereitgestellt sind, welche geeignet sind, die auf das Verbindungsstück (15) gepackten Elemente zusammenzudrücken.
  2. Durchführungsisolator (13) nach Anspruch 1, dadurch gekennzeichnet, dass der innere Isolierkörper (30) durch Aufformen auf das Verbindungsstück (15) oder als separates Teil durch Formen bereitgestellt ist.
  3. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der innere Isolierkörper (30) eine rohrförmige Struktur aufweist, welche in einem aufwärts gerichteten Bereich in Anlage an die Innenseite des Tanks (11) zu platzieren ist und ein unteres End aufweist, welches mit einem Boden (31) versehen ist, von dem ein rohrförmiger Fortsatz (32) monolithisch einwärts ragt und das untere Ende (17) des Verbindungsstücks (15) umgibt, wobei der Fortsatz den Teil bildet, der mit dem Verbindungsstück fest verkoppelt ist.
  4. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der innere Isolierkörper (30) einen hexagonalen Querschnitt aufweist.
  5. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der äußere Isolierkörper (24) mit einem ringförmigen Bereich (27), der außen durch den glockenförmigen Bereich begrenzt ist und innen durch die rohrförmige Verlängerung (26) begrenzt ist, gegen den Tank (11) zu packen ist, wobei die Dichtung (28) zwischen dem ringförmigen Bereich (27) und dem Tank (11) angeordnet ist.
  6. Durchführungsisolator (13) nach Anspruch 5, dadurch gekennzeichnet, dass die zwischen dem ringförmigen Bereich (27) und dem Tank (11) angeordnete Dichtung (28) eine Kork-Gummi-Dichtung ist.
  7. Durchführungsisolator (13) nach Anspruch 5, dadurch gekennzeichnet, dass der ringförmige Bereich (27) des äußeren Isolierkörpers (24) die Dichtung (28) vollständig bedeckt.
  8. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der innere Isolierkörper (30) aus einem Kunststoff hergestellt ist, der gegenüber Transformatorölen beständig ist.
  9. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der äußere Isolierkörper (24) und der innere Isolierkörper (30) aus ca. 70 % Polyamid und ca. 30 % Glasfaser bestehen.
  10. Durchführungsisolator (13) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Haube (22) aus ca. 70 % eines als PBT bekannten Materials und ca. 30 % Glasfaser besteht.
EP99112778A 1998-07-09 1999-07-02 Isolatorbuchse Expired - Lifetime EP0971378B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD980076 1998-07-09
IT1998PD000076U IT245076Y1 (it) 1998-07-09 1998-07-09 Isolatore passante perfezionato.

Publications (2)

Publication Number Publication Date
EP0971378A1 EP0971378A1 (de) 2000-01-12
EP0971378B1 true EP0971378B1 (de) 2005-12-14

Family

ID=11392139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112778A Expired - Lifetime EP0971378B1 (de) 1998-07-09 1999-07-02 Isolatorbuchse

Country Status (6)

Country Link
EP (1) EP0971378B1 (de)
AT (1) ATE313147T1 (de)
DE (1) DE69928871D1 (de)
ES (1) ES2255743T3 (de)
IT (1) IT245076Y1 (de)
PT (1) PT971378E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455717C2 (ru) * 2006-06-05 2012-07-10 Комем С.П.А. Проходной изолятор для электрических трансформаторов
TWI416130B (zh) * 2010-12-28 2013-11-21 Tatung Co 套管絕緣測試治具

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2261055B2 (es) * 2001-10-26 2008-05-16 Grupo Ormazabal, S.A. Pasatapas de barra, unipolar.
WO2003036660A1 (es) * 2001-10-26 2003-05-01 Grupo Ormazabal, S.A. Pasatapas de barra, unipolar
ITMI20030678A1 (it) * 2003-04-07 2004-10-08 Cedaspe S P A Isolatore per trasformatori
CN101496125B (zh) * 2006-07-31 2012-03-14 西门子公司 用于电开关设备安全壳体的封闭盖
CN103413659B (zh) * 2013-09-02 2016-08-17 丹阳市金诺电器有限公司 一种组合式1kv级变压器套管
KR102658674B1 (ko) * 2023-10-11 2024-04-17 송홍준 주상변압기용 저압부싱
KR102673938B1 (ko) * 2024-04-29 2024-06-11 (주)에이넥 변압기용 부싱

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0944101A1 (de) * 1998-03-18 1999-09-22 Pioch S.A. Stromschienen-Anordnung und elektrische Durchführung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1373721A (fr) * 1963-07-26 1964-10-02 Materiel Electrique S W Le Traversée isolante sous forte intensité, pour transformateurs immergés dans un liquide diélectrique
US3936592A (en) * 1975-01-02 1976-02-03 Westinghouse Electric Corporation Electrical bushing having a central conductor with large planar terminal portions at each end
JPS58162012A (ja) * 1982-03-23 1983-09-26 Hitachi Ltd 静止誘導電器
ES286246Y (es) * 1985-04-23 1987-01-16 Pol Sa Pasabarras para transformadores electricos
DE8707789U1 (de) * 1987-06-01 1987-07-16 Speicher, Kurt Peter, 6635 Schwalbach Stromdurchführung für mit einer Flüssigkeit gefüllte Gefäße
FR2719150B1 (fr) * 1994-04-21 1996-06-07 Pioch Sa Passe-tige, notamment pour transformateur.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0944101A1 (de) * 1998-03-18 1999-09-22 Pioch S.A. Stromschienen-Anordnung und elektrische Durchführung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455717C2 (ru) * 2006-06-05 2012-07-10 Комем С.П.А. Проходной изолятор для электрических трансформаторов
TWI416130B (zh) * 2010-12-28 2013-11-21 Tatung Co 套管絕緣測試治具

Also Published As

Publication number Publication date
ATE313147T1 (de) 2005-12-15
IT245076Y1 (it) 2002-03-19
ITPD980076U1 (it) 2000-01-09
DE69928871D1 (de) 2006-01-19
ES2255743T3 (es) 2006-07-01
EP0971378A1 (de) 2000-01-12
PT971378E (pt) 2006-05-31

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