EP1865517A2 - Durchführungsisolator für elektrische Wandler - Google Patents

Durchführungsisolator für elektrische Wandler Download PDF

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Publication number
EP1865517A2
EP1865517A2 EP07109028A EP07109028A EP1865517A2 EP 1865517 A2 EP1865517 A2 EP 1865517A2 EP 07109028 A EP07109028 A EP 07109028A EP 07109028 A EP07109028 A EP 07109028A EP 1865517 A2 EP1865517 A2 EP 1865517A2
Authority
EP
European Patent Office
Prior art keywords
insulator
feedthrough insulator
metallic
insulating body
tie rod
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.)
Withdrawn
Application number
EP07109028A
Other languages
English (en)
French (fr)
Other versions
EP1865517A3 (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.)
ABB Schweiz AG
Original Assignee
Comem SpA
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 Comem SpA filed Critical Comem SpA
Publication of EP1865517A2 publication Critical patent/EP1865517A2/de
Publication of EP1865517A3 publication Critical patent/EP1865517A3/de
Withdrawn legal-status Critical Current

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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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • 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

  • the present invention refers, in general, to a feedthrough insulator for electrical transformers and to improvements to such an insulator, compared to conventional insulators made according to the prior art.
  • the adopted technical solution lends itself particularly to use in medium-high voltage feedthrough insulators, however it can irrespectively be used in all types of feedthrough insulators to be applied between an electrical conductor and a transformer tank.
  • feedthrough insulators allow the passage of an electrical conductor under voltage through an obstacle, consisting for example of a transformer tank, ensuring a seal, in terms of electrical voltage, between the free end of the conductor and the point of attachment onto the insulator tank, with sufficiently high values with respect to the operating values.
  • Conventional feedthrough insulators comprise a tie rod, which acts as an electrical conductor and that axially crosses a first portion of an insulating body, arranged in air and placed outside of the tank, and a second portion of the insulating body placed inside of the tank, advantageously coupled with the outer portion.
  • the insulating parts of the insulator are made from epoxy resin and/or ceramic materials, such as porcelain, for the intrinsic characteristics of such materials of high rigidity, good mechanical strength and good resistance to temperature variations.
  • the finished product is also conventionally covered by a layer of material suitable for making an extremely smooth outer surface, in order to ease the self-washing of the insulator when it rains.
  • the surface layer of the insulator it is necessary for the surface layer of the insulator to have the same dilation coefficient as the porcelain or the resin, of which the insulating body consists, to avoid the formation of surface cracks and fissures, which can, over time, lead to the insulator breaking.
  • the fragility of the insulating parts made from ceramic material is also worth noting; indeed, these insulating parts require that the user take special care every time they have to be handled.
  • a metallic coating is made on the bottom part of the insulator (portion indicated with X in the attached figure 1, which illustrates a conventional medium-high voltage ceramic insulator), in order to screen the metallic attachment areas, excluding the support plane, for example of the transformer.
  • the purpose of the present invention is, therefore, to avoid the quoted drawbacks and, in particular, to make a feedthrough insulator for electrical transformers, which ensures better insulating characteristics compared to those of conventional insulators, above all in critical environmental conditions and in contaminated areas in general, and that has, at the same time, a rigid and robust structure, such as to be handled without requiring any special care and to resist perfectly to atmospheric agents of whatever type.
  • Another purpose of the present invention is to make a feedthrough insulator for electrical transformers, which allows better characteristics of functionality and reliability to be obtained, compared to conventional insulators.
  • a further purpose of the present invention is to make a feedthrough insulator for electrical transformers, which allows the production and design costs of the insulator to be reduced, compared to the prior art, and that allows all of the assembly operations of the structure to be substantially simplified.
  • a further purpose of the invention is to make a feedthrough insulator for electrical transformers, which ensures greater resistance to knocks, compared to known types of insulators.
  • Another purpose of the invention is to make a feedthrough insulator for electrical transformers that does not need the air venting operation at the moment of filling the transformer with oil.
  • the last but not least purpose of the invention is to make a feedthrough insulator for electrical transformers, which has a metallic screen embedded in the resin, provided with small arms, which has the dual purpose of screening the metallic attachment parts, including the support base, for example, of the transformer, and of acting as a condenser for the capacitive intakes.
  • a feedthrough insulator for electrical transformers made according to the present invention, is generically indicated with 10.
  • the insulator 10 is suitable for being fixed to the top part of the electrical transformer tank (not illustrated in the figures), at a respective opening, defined on it.
  • the feedthrough insulator 10 has a mainly longitudinal extension and is crossed axially by a metallic tie rod 11, which acts as an electrical conductor.
  • the tie rod 11 has a top end 12 that, in operative condition, remains outside of the tank, and a bottom end 13, intended to remain inside the tank of the transformer, after having crossed its quoted opening.
  • the insulator comprises an insulating body, wholly indicated with 18, of which a first portion, generically indicated with 14, is arranged in air and is crossed axially by the tie rod 11, whereas a second portion, indicated with 15, to be arranged inside the tank, essentially consists of an inner insulating body 16, also crossed axially by the metallic tie rod 11.
  • the outer insulating body 14 has a series of fins 17, made in a large number and close together, as well as suitably sized, in order to increase the length of the escape line, compared to conventional insulators and, therefore, optimise the dielectric characteristics of the insulator.
  • the portion of insulator in air 14 is formed from an insulating coating made from silicon, equipped with fins 17, which cover a more inner layer made from epoxy resin, which, in turn, surrounds the metallic conductor 11.
  • This type of combined insulation allows excellent electrical insulation characteristics and adequate outer protection of the insulator, the structure of which is extremely robust and does not need special care during transportation and/or installation.
  • Such a type of coating allows the use of the insulator in any critical environmental conditions and, in particular, in contaminated areas, since it has excellent electrical characteristics and resists well to knocks, as well as to the direct action of atmospheric agents.
  • the insulating body 16 In operative position, the insulating body 16 is placed inside the electrical transformer tank and surrounds the bottom end 13 of the metallic tie rod 11.
  • the attachment of the body 16 to the tie rod 11 can be carried out through a threading in the bottom end of the tie rod 11, or else by means of a suitable punching on the tie rod 11 itself; alternatively, the inner insulating body 16 can be obtained individually by moulding or else by overmoulding on the tie rod 11, so as to constitute, in practice, a single piece.
  • a further advantageous characteristic of the invention is represented by the fact that inside the layer of epoxy resin of the insulating body 18 a metallic screen 19 is embedded, equipped with respective arms 20, which has the purpose of screening the metallic attachment components and the support base, for example, of the transformer, indicated with 21 in the attached figures.
  • Such a structural coating ensures an excellent resistance to thermal variations and to the fluids present inside the transformers.
  • feedthrough insulator according to the invention is obtained by the assembly of a reduced number of components, compared to the known types of insulators, and it does not require any particular maintenance, thanks to the surface coating, which, in practice, shields it from the direct action of atmospheric agents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Installation Of Bus-Bars (AREA)
  • Insulating Bodies (AREA)
EP07109028A 2006-06-05 2007-05-28 Durchführungsisolator für elektrische Wandler Withdrawn EP1865517A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20060166 ITVI20060166A1 (it) 2006-06-05 2006-06-05 Isolatore passante per trasformatori elettrici

Publications (2)

Publication Number Publication Date
EP1865517A2 true EP1865517A2 (de) 2007-12-12
EP1865517A3 EP1865517A3 (de) 2009-05-06

Family

ID=38328618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07109028A Withdrawn EP1865517A3 (de) 2006-06-05 2007-05-28 Durchführungsisolator für elektrische Wandler

Country Status (5)

Country Link
EP (1) EP1865517A3 (de)
BR (1) BRPI0701670A (de)
IT (1) ITVI20060166A1 (de)
RU (1) RU2455717C2 (de)
UA (1) UA91525C2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070321A1 (en) * 2008-12-18 2010-06-24 Tyco Electronics Uk Ltd Electrical current feed through bush
EP2276040A1 (de) * 2009-07-15 2011-01-19 ABB Research Ltd. Vorrichtung zum elektrischen Anschluss, Verfahren zur Herstellung der Vorrichtung und elektrische Anlage
EP2276041A1 (de) * 2009-07-15 2011-01-19 ABB Research Ltd. Vorrichtung für eine elektrische Verbindung und elektrische Anlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1018756A2 (de) * 1998-12-07 2000-07-12 Soule Materiel Electrique Mittle oder Hochspannungsschaltvorrichtung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1503073A (en) * 1919-05-05 1924-07-29 Steinberger Louis Insulated connecter
US3646251A (en) * 1970-12-08 1972-02-29 Westinghouse Electric Corp Electrical bushing having stress-grading layer disposed within solid insulation including a ground layer term inated at each end with a layer of material having a voltage-dependent resistivity
GB2110479B (en) * 1981-09-21 1985-10-23 Raychem Corp Electrical bushing and method of manufacture thereof
US4500745A (en) * 1983-03-03 1985-02-19 Interpace Corporation Hybrid electrical insulator bushing
JPH02148627A (ja) * 1988-11-30 1990-06-07 Meidensha Corp 碍管
SE506172C2 (sv) * 1996-02-29 1997-11-17 Ramkiw Ab Anordning för isolering av högspänningsledare
IT245076Y1 (it) * 1998-07-09 2002-03-19 Comem Spa Isolatore passante perfezionato.
DE19926950A1 (de) * 1999-06-14 2000-12-21 Abb Research Ltd Kabelendgarnitur
RU2173902C1 (ru) * 1999-12-23 2001-09-20 Общество с ограниченной ответственностью ООО "Альфа-Энерго" Опорная стержневая изоляционная конструкция
US20050155786A1 (en) * 2001-02-02 2005-07-21 Krol Robert A. Apparatus bushing with silicone-rubber housing
US20020104679A1 (en) * 2001-02-02 2002-08-08 Krol Robert A. Apparatus bushing with silicone-rubber housing
ITMI20030678A1 (it) * 2003-04-07 2004-10-08 Cedaspe S P A Isolatore per trasformatori
SE526713C2 (sv) * 2003-07-11 2005-10-25 Abb Research Ltd Genomföring samt förfarande för tillverkning av genomföringen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1018756A2 (de) * 1998-12-07 2000-07-12 Soule Materiel Electrique Mittle oder Hochspannungsschaltvorrichtung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010070321A1 (en) * 2008-12-18 2010-06-24 Tyco Electronics Uk Ltd Electrical current feed through bush
EP2276040A1 (de) * 2009-07-15 2011-01-19 ABB Research Ltd. Vorrichtung zum elektrischen Anschluss, Verfahren zur Herstellung der Vorrichtung und elektrische Anlage
EP2276041A1 (de) * 2009-07-15 2011-01-19 ABB Research Ltd. Vorrichtung für eine elektrische Verbindung und elektrische Anlage
WO2011006720A1 (en) * 2009-07-15 2011-01-20 Abb Research Ltd A device for electric connection, a method for producing such a device, and an electric installation
WO2011006716A1 (en) * 2009-07-15 2011-01-20 Abb Research Ltd A device for electric connection and an electric installation
CN102473489A (zh) * 2009-07-15 2012-05-23 Abb研究有限公司 用于电连接的设备、用于制造此类设备的方法和电气装置
CN102473490A (zh) * 2009-07-15 2012-05-23 Abb研究有限公司 用于电气连接的设备和电气装置
US8366484B2 (en) 2009-07-15 2013-02-05 Abb Research Ltd. Device for electric connection, a method for producing such a device, and an electric installation
CN102473489B (zh) * 2009-07-15 2015-11-25 Abb研究有限公司 用于电连接的设备、用于制造此类设备的方法和电气装置

Also Published As

Publication number Publication date
UA91525C2 (ru) 2010-08-10
RU2455717C2 (ru) 2012-07-10
RU2007120613A (ru) 2008-12-10
ITVI20060166A1 (it) 2007-12-06
BRPI0701670A (pt) 2008-02-19
EP1865517A3 (de) 2009-05-06

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