WO2008074166A1 - A bushing and a method for producing the same - Google Patents

A bushing and a method for producing the same Download PDF

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Publication number
WO2008074166A1
WO2008074166A1 PCT/CH2006/000726 CH2006000726W WO2008074166A1 WO 2008074166 A1 WO2008074166 A1 WO 2008074166A1 CH 2006000726 W CH2006000726 W CH 2006000726W WO 2008074166 A1 WO2008074166 A1 WO 2008074166A1
Authority
WO
WIPO (PCT)
Prior art keywords
flange
contact
bushing
matrix material
bushing according
Prior art date
Application number
PCT/CH2006/000726
Other languages
French (fr)
Inventor
Jens Rocks
Vincent Tilliette
Gerd Chalikia
Roger Hedlund
Michael Gabriel
Original Assignee
Abb Research Ltd
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 Abb Research Ltd filed Critical Abb Research Ltd
Priority to PCT/CH2006/000726 priority Critical patent/WO2008074166A1/en
Priority to CN200680056716.7A priority patent/CN101669178B/en
Priority to EP06817776A priority patent/EP2095378A1/en
Priority to BRPI0622234-0A priority patent/BRPI0622234A2/en
Priority to JP2009541722A priority patent/JP2010514395A/en
Publication of WO2008074166A1 publication Critical patent/WO2008074166A1/en
Priority to US12/487,336 priority patent/US7812266B2/en

Links

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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/265—Fastening 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
    • H01B17/005—Insulators structurally associated with built-in electrical equipment
    • 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 invention concerns a bushing according to the generic part of claim 1 and a method for producing such bushing.
  • Bushings of this type are known as electrical condenser bushings and used, in medium and high voltage electrical installations, for leading a conductor through a grounded barrier, e.g., a metal wall of a transformer, tank or substation housing or similar.
  • Bushings of the generic type with flanges made of metal, in particular of aluminium, are well known. They are, however, rather expensive. In particular, the manufacturing process is rather complicated. First, a core comprising an electrical field grading insulation and a test tap connection point must be produced, e.g., by moulding and finished by machining. The expensive metal flange must be produced separately and afterwards fixed to the core, usually with an adhesive, and an electrical connection with the test tap connection point established.
  • the flange is in one piece with the core, comprising the same insulating matrix material. No machining is required. Production costs are considerably reduced.
  • the surface of a plastic flange is usually too soft to withstand the high mechanical loads exerted on it by bolts used to mount the bushing to, e.g., any kind of plane, a housing or a wall.
  • the metal flange of known generic bushings is employed for grounding the test contact of the test tap incorporated in the housing, establishing an electrically conductive connection between the grounding contact and the wall via the bolts used for mounting the bushing to the same, such a connection is not automatically present in a bushing with a flange comprising an electrically insulating material.
  • the bushing according to the invention is robust and can be reliably fixed to the wall while also establishing the reguired electrically conductive connection of the grounding contact with the same, just as a known .generic bushing with a metal flange would.
  • the invention also concerns a particularly simple and cost- efficient way of producing a bushing as claimed where, after positioning elements of the grading insulation and other components in a mould, the bushing, including the flange, is essentially completed in one shot by filling of the mould with insulating matrix material.
  • Fig. 1 shows a side view of a bushing according to the invention, and part of a wall the bushing is attached to
  • Fig. 2 shows a cross section along II-II in Fig. 1,
  • Fig. 3 shows a longitudinal section along III-III in Fig. 1 and
  • Fig. 4 shows a portion of Fig. 3, enlarged and with additional details.
  • the bushing comprises a core 1 with a roughly cylindrical shell 2 surrounded by a flange 3 with a sleeve surrounding the shell 2 and an annular part for attaching the bushing to a plane grounded wall 4 or the like, e.g., the metal wall of a transformer or substation housing.
  • the shell 2 and the flange 3 are in one piece and comprise an insulating matrix material, preferably a plastic material, e.g., a polymer or mixture of polymers or an insulating resin, preferably mixed with an anorganic filler material like silica, alumina or boron nitride.
  • a plane first face of the flange 3 is in contact with the wall 4 or a housing.
  • the shell 2 encapsulates an electrical field grading insulation 5 (s. Fig. 3) , which is configured as a winding made from a web of porous material, in particular paper or fiber fabric, impregnated with the matrix material, with a plurality of cylindrical coaxial or wound conductor layers configured as sheets of, e.g., metal foil, each placed between subsequent turns of the winding.
  • the grading insulation 5 surrounds an axial duct 6 for accommodating a conductor rod (not shown) .
  • a sleeve 7 is provided which serves as a contact element for contacting the conductor rod.
  • the sleeve 7 consists of metal, e.g., aluminium, and is electrically conductively connected to the innermost conductor layer of the grading insulation 5.
  • the flange 3, which projects laterally and circumferentially surrounds the outer shell 2, has a plurality of axial through holes 8 equally distributed along its circumference, e.g., twelve of them as shown in Fig. 2. Every one of the through holes 8 is formed by a metal insert 9 partially embedded in the flange 3, each comprising (Fig.
  • a threaded ring 10 surrounding the through hole 8 and carrying at its end proximal to a second face of the flange 3 opposite the first face a laterally outward projecting rim 11 that exhibits an annular surface flush with the said second face of the flange 3.
  • Every one of the rings 10 accommodates a threaded bolt 12 the head of which abuts against the annular surface of the rim 11 and which extends through the through hole 8 and into an aligned threaded hole in the wall 4.
  • the metal inserts 9 which may comprise, e.g., aluminium or steel, they are hard and wear- resistant and considerable force may be applied for ensuring a reliable mechanical connection between the flange 3 and the wall 4 without risk of damage to the surface of the flange 3.
  • the flange is typically annular, but any other design suitable for mounting the flange with its first side, which is to be mounted to the wall 4 or housing, can be used (e.g. the flange having an outer rectangular form).
  • a test tap 13 which projects radially outward from the cylindrical shell 2.
  • the tast tap 13 comprises a test contact shaped as a contact pin 14 which is electrically conductively connected to the outermost conductor layer of the grading insulation 5.
  • the contact pin 14 is coaxially surrounded at a distance by a contact ring 15 which serves as a grounding contact.
  • An insulating ring 16 separates the contact ring 15 from the contact pin 14 to prevent flashovers.
  • Every second one of the metal inserts 9 is electrically conductively connected to the contact ring 15 by a connection element, e.g., a connection wire 17.
  • the connection wires 17 each comprise an electrically conductive material, usually metal, e.g., aluminium or copper. They have equal lengths and cross sections so as to exhibit equal electrical resistances.
  • test tap 13 is covered by a metal cap (not shown) which electrically conductively connects the contact pin 14 to the contact ring 15 so the outermost conductor layer of the grading insulation 5 is grounded.
  • a metal cap (not shown) which electrically conductively connects the contact pin 14 to the contact ring 15 so the outermost conductor layer of the grading insulation 5 is grounded.
  • the contact pin 14 is electrically disconnected from the contact ring 15 and can be connected to an input of a measuring instrument, e.g., a voltmeter, and electrical measurements carried out for diagnostic and other purposes.
  • the bushing as decribed is produced as follows:
  • the winding for the electrical field grading insulation 5 is wound from a web of porous material, with the sheets of metal foil inserted between subsequent turns (or the porous material comprises metal coatings or a net shaped or meshed material is used) , and then fixed inside a mould together with the diverse metal parts, i.e., the sleeve 7, the metal inserts 9, the contact pin 14, the grounding contact 15, the connection wires 17 and other electrical connections.
  • the diverse metal parts i.e., the sleeve 7, the metal inserts 9, the contact pin 14, the grounding contact 15, the connection wires 17 and other electrical connections.
  • liquid insulating matrix material e.g., a plastic material, in particular a polymer or mixture of polymers or resin, preferably with an admixture of anorganic filler material like silica, alumina, dolomite, wollastonite or boron nitride as described above.
  • This step can be carried out in different ways, e.g., involving vacuum casting or, preferably, automated pressure gelation or injection moulding.
  • the matrix material forms the shell 2 and the flange 3 and at the same time impregnates the porous material of the winding to complete the formation of the grading insulation 5. Afterwards the matrix material is left to harden. When it has solidified sufficiently the mould is opened and the bushing removed.
  • the metal inserts can be of various shapes, e.g., each may comprise a ring extending through the through hole to the first face of the flange and carrying a second rim at the end proximal to the same. It is also possible to replace the plurality of metal inserts by a single metal insert, e.g., in the shape of a ring essentially following the circumference of the flange and forming an annular surface interrupted by the through holes. Connection cables or massive connection pieces may be used in stead of connection wires and various materials can be employed, provided that they offer sufficient electrical conductivity.
  • the grounding contact is connected to the at least one contact piece at three or more positions which are essentially equally distributed over the circumference of the flange as in this way an approximately axially symmetrical distribution of currents and electromagnetic fields is achieved.
  • the shape of the core can be, at least in part, frustoconical.
  • the flange can be reinforced by ribs or reinforcing materials, e.g., glass fibers. List of reference symbols

Landscapes

  • Insulators (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Insulating Bodies (AREA)
  • Cable Accessories (AREA)

Abstract

A bushing with a duct (6) for accommodating a conductor rod which is surrounded by an electrical field grading insulation (5) comprises a core (1) with a cylindrical shell (2) encapsulating the grading insulation (5) and a f lange (3) surrounding the said shell (2) and carrying through holes (8) distributed over its circumference for allowing the bushing to be attached to a wall (4) by bolts (12). The shell (2) and the flange (3) are in one piece and consist of an insulating matrix material, e.g., a plastic material mixed with an anorganic filier material. The through holes (8) are surrounded by essentially ring-shaped metal inserts (9) each forming an annular surface flush with the surface of the flange (3) which is in contact with the head of the bolt (12) and takes up the force exerted by the latter on the flange (3). A test tap (13) comprises a contact pin (14) which is electrically conductively connected to the outermost layer of the grading insulation (5) and surrounded by a contact ring (15) connected to every second metal insert (9) by connection wires (17) for grounding the contact pin (14) via the contact ring (15) when the test tap (13) is not in use and covered by a metal cap. The core (1) is produced by filling a mould with the liquid matrix material after components of the grading insulation (5) and other parts have been fixed in the same.

Description

D E S C R I P T I O N
A BUSHING AND A METHOD FOR PRODUCING THE SAME
Field of the invention
The invention concerns a bushing according to the generic part of claim 1 and a method for producing such bushing. Bushings of this type are known as electrical condenser bushings and used, in medium and high voltage electrical installations, for leading a conductor through a grounded barrier, e.g., a metal wall of a transformer, tank or substation housing or similar.
Prior art
Bushings of the generic type with flanges made of metal, in particular of aluminium, are well known. They are, however, rather expensive. In particular, the manufacturing process is rather complicated. First, a core comprising an electrical field grading insulation and a test tap connection point must be produced, e.g., by moulding and finished by machining. The expensive metal flange must be produced separately and afterwards fixed to the core, usually with an adhesive, and an electrical connection with the test tap connection point established.
Summary of the invention
According to the invention the flange is in one piece with the core, comprising the same insulating matrix material. No machining is required. Production costs are considerably reduced. However, the surface of a plastic flange is usually too soft to withstand the high mechanical loads exerted on it by bolts used to mount the bushing to, e.g., any kind of plane, a housing or a wall. Also, while the metal flange of known generic bushings is employed for grounding the test contact of the test tap incorporated in the housing, establishing an electrically conductive connection between the grounding contact and the wall via the bolts used for mounting the bushing to the same, such a connection is not automatically present in a bushing with a flange comprising an electrically insulating material.
Due to the features enumerated in the characterizing clause of claim 1, however, these problems are solved at the same time. The bushing according to the invention is robust and can be reliably fixed to the wall while also establishing the reguired electrically conductive connection of the grounding contact with the same, just as a known .generic bushing with a metal flange would.
The invention also concerns a particularly simple and cost- efficient way of producing a bushing as claimed where, after positioning elements of the grading insulation and other components in a mould, the bushing, including the flange, is essentially completed in one shot by filling of the mould with insulating matrix material.
Brief description of the drawings
The invention will be explained with reference to the following figures which show only an embodiment.
Fig. 1 shows a side view of a bushing according to the invention, and part of a wall the bushing is attached to, Fig. 2 shows a cross section along II-II in Fig. 1,
Fig. 3 shows a longitudinal section along III-III in Fig. 1 and
Fig. 4 shows a portion of Fig. 3, enlarged and with additional details.
Description of the preferred embodiments
The bushing comprises a core 1 with a roughly cylindrical shell 2 surrounded by a flange 3 with a sleeve surrounding the shell 2 and an annular part for attaching the bushing to a plane grounded wall 4 or the like, e.g., the metal wall of a transformer or substation housing. The shell 2 and the flange 3 are in one piece and comprise an insulating matrix material, preferably a plastic material, e.g., a polymer or mixture of polymers or an insulating resin, preferably mixed with an anorganic filler material like silica, alumina or boron nitride. A plane first face of the flange 3 is in contact with the wall 4 or a housing. The shell 2 encapsulates an electrical field grading insulation 5 (s. Fig. 3) , which is configured as a winding made from a web of porous material, in particular paper or fiber fabric, impregnated with the matrix material, with a plurality of cylindrical coaxial or wound conductor layers configured as sheets of, e.g., metal foil, each placed between subsequent turns of the winding. The grading insulation 5 surrounds an axial duct 6 for accommodating a conductor rod (not shown) . At one end of the duct 6 a sleeve 7 is provided which serves as a contact element for contacting the conductor rod. The sleeve 7 consists of metal, e.g., aluminium, and is electrically conductively connected to the innermost conductor layer of the grading insulation 5. The flange 3, which projects laterally and circumferentially surrounds the outer shell 2, has a plurality of axial through holes 8 equally distributed along its circumference, e.g., twelve of them as shown in Fig. 2. Every one of the through holes 8 is formed by a metal insert 9 partially embedded in the flange 3, each comprising (Fig. 4) a threaded ring 10 surrounding the through hole 8 and carrying at its end proximal to a second face of the flange 3 opposite the first face a laterally outward projecting rim 11 that exhibits an annular surface flush with the said second face of the flange 3. Every one of the rings 10 accommodates a threaded bolt 12 the head of which abuts against the annular surface of the rim 11 and which extends through the through hole 8 and into an aligned threaded hole in the wall 4. When the bolts 12 are tightened the pressure exerted by their heads on the second face of the flange 3 acts on the annular surfaces of the rims 11. As the said annular surfaces are formed by the metal inserts 9 which may comprise, e.g., aluminium or steel, they are hard and wear- resistant and considerable force may be applied for ensuring a reliable mechanical connection between the flange 3 and the wall 4 without risk of damage to the surface of the flange 3. The flange is typically annular, but any other design suitable for mounting the flange with its first side, which is to be mounted to the wall 4 or housing, can be used (e.g. the flange having an outer rectangular form).
On the sleeve of the flange 3 a test tap 13 is provided which projects radially outward from the cylindrical shell 2. The tast tap 13 comprises a test contact shaped as a contact pin 14 which is electrically conductively connected to the outermost conductor layer of the grading insulation 5. The contact pin 14 is coaxially surrounded at a distance by a contact ring 15 which serves as a grounding contact. An insulating ring 16 separates the contact ring 15 from the contact pin 14 to prevent flashovers. Every second one of the metal inserts 9 is electrically conductively connected to the contact ring 15 by a connection element, e.g., a connection wire 17. The connection wires 17 each comprise an electrically conductive material, usually metal, e.g., aluminium or copper. They have equal lengths and cross sections so as to exhibit equal electrical resistances.
Normally the test tap 13 is covered by a metal cap (not shown) which electrically conductively connects the contact pin 14 to the contact ring 15 so the outermost conductor layer of the grading insulation 5 is grounded. When the cap is removed the contact pin 14 is electrically disconnected from the contact ring 15 and can be connected to an input of a measuring instrument, e.g., a voltmeter, and electrical measurements carried out for diagnostic and other purposes.
The bushing as decribed is produced as follows:
First the winding for the electrical field grading insulation 5 is wound from a web of porous material, with the sheets of metal foil inserted between subsequent turns (or the porous material comprises metal coatings or a net shaped or meshed material is used) , and then fixed inside a mould together with the diverse metal parts, i.e., the sleeve 7, the metal inserts 9, the contact pin 14, the grounding contact 15, the connection wires 17 and other electrical connections. Then the mould is filled with liquid insulating matrix material, e.g., a plastic material, in particular a polymer or mixture of polymers or resin, preferably with an admixture of anorganic filler material like silica, alumina, dolomite, wollastonite or boron nitride as described above. This step can be carried out in different ways, e.g., involving vacuum casting or, preferably, automated pressure gelation or injection moulding. The matrix material forms the shell 2 and the flange 3 and at the same time impregnates the porous material of the winding to complete the formation of the grading insulation 5. Afterwards the matrix material is left to harden. When it has solidified sufficiently the mould is opened and the bushing removed.
There are many ways of modifying the above-described design within the scope of the invention. In particular, the metal inserts can be of various shapes, e.g., each may comprise a ring extending through the through hole to the first face of the flange and carrying a second rim at the end proximal to the same. It is also possible to replace the plurality of metal inserts by a single metal insert, e.g., in the shape of a ring essentially following the circumference of the flange and forming an annular surface interrupted by the through holes. Connection cables or massive connection pieces may be used in stead of connection wires and various materials can be employed, provided that they offer sufficient electrical conductivity. It is preferred that the grounding contact is connected to the at least one contact piece at three or more positions which are essentially equally distributed over the circumference of the flange as in this way an approximately axially symmetrical distribution of currents and electromagnetic fields is achieved. The shape of the core can be, at least in part, frustoconical. The flange can be reinforced by ribs or reinforcing materials, e.g., glass fibers. List of reference symbols
1 core
2 shell
3 flange 4 wall
5 grading insulation
6 duct
7 sleeve
8 through hole 9 metal insert
10 ring
11 rim
12 bolt
13 test tap 14 contact pin
15 contact ring
16 insulating ring
17 connection wire

Claims

PATEN T C LA I MS
1. A bushing comprising a rotationalIy symmetrical core
(1) surrounding an axial duct (6) for accommodating a conductor and comprising a grading insulation (5) surrounding the duct (6), with a plurality of cylindrical coaxial or wound conductor layers which are electrically insulated from each other, the innermost conductor layer being electrically conductively connected to a contact element arranged in the duct (6) for establishing contact with the conductor and an outer shell (2) comprising an insulating matrix material with, at a circumference, a test tap (13) with a test contact electrically conductively connected to the outermost conductor layer of the grading insulation (5) and a grounding contact (15) electrically connectable to the test contact and with a flange (3) laterally projecting and circumferentially surrounding the outer shell (2) , which flange has axial through holes (8) for accommodating metallic bolts (12) for mounting the bushing, a first side of the said flange (3) being adjacent to the mounting side, characterized in that the flange (3) is in one piece with the shell
(2) of the core (1), comprising the same insulating matrix material and at least one metal insert (9) at least partially embedded in the insulating matrix material adjacent to the through holes (8) in such a way that the at least one metal insert (9) forms at least part of the surface of the flange (3) surrounding the through holes (8) on a second face of the flange (3) opposite the said first face of the same, and at least one electrically conductive connection element is provided which connects the grounding contact (15) with the at least one metal insert (9) .
2. A bushing according to claim 1, characterized in that there is one metal insert (9) for every through hole (8), each comprising a ring (10) at least partially surrounding the respective through-hole (8) .
3. A bushing according to claim 2, characterized in that in each case at least at the end proximal to the second face of the flange (3) the ring (10) is provided with a laterally outward projecting rim (11) exhibiting a surface flush with the said second face of the flange (3).
4. A bushing according to claim 2, characterized in that in each case the ring is at both ends provided with a laterally outward-projecting rim, the rims each exhibiting a surface flush with one of the said first and second faces of the flange.
5. A bushing according to one of claims 1 to 4, characterized in that there are at least three connection elements each connecting the grounding contact with the at least one metal insert (9) .
6. A bushing according to claim 5, characterized in that the connection elements have virtually the same electrical resistances.
7. A bushing according to one of claims 1 to 6, characterized in that the test contact is in the shape of a contact pin (14) .
8. A bushing according to claim 7, characterized in that the grounding contact is in the shape of a contact ring (15) coaxially surrounding the contact pin (14) .
9. A bushing according to one of claims 1 to 8, characterized in that the test tap (13) comprises a removable metal cap which, when the test tap (13) is not being used, is in contact with the grounding contact as well- as with the test contact so as to provide an electrically conductive connection between them.
10. A bushing according to one of claims 1 to 9, characterized in that the grading insulation (5) is a winding of porous web material like paper or fiber fabric impregnated with the insulating matrix material, with the conductor layers each formed by a sheet of electrically conductive material placed between subsequent turns of the winding.
11. A bushing according to one of claims 1 to 10, characterized in that the insulating matrix material is a plastic material, in particular a polymer or mixture of polymers or a resin, preferably mixed with an anorganic filler material like silica, alumina or boron nitride.
12. A method of producing a bushing according to one of claims 1 to 11, characterized in that at least components of the grading insulation (5), the test contact, the at least one metal insert (9) and the at least one connection element are placed in a mould, whereupon the mould is filled with liquid insulating matrix material, the matrix material is left to harden and the bushing is removed from the mould.
13. A method according to claim 12, characterized in that the mould is filled with the insulating matrix material during a filling step involving vacuum casting or, preferably, automated pressure gelation, injection moulding or compression moulding.
14. A method according to claim 12 or 13, characterized in that the insulating matrix material is a plastic material, in particular a polymer or mixture of polymers or a resin, preferably with an admixture of anorganic filler material like silica, alumina or boron nitride.
PCT/CH2006/000726 2006-12-20 2006-12-20 A bushing and a method for producing the same WO2008074166A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PCT/CH2006/000726 WO2008074166A1 (en) 2006-12-20 2006-12-20 A bushing and a method for producing the same
CN200680056716.7A CN101669178B (en) 2006-12-20 2006-12-20 A bushing and a method for producing the same
EP06817776A EP2095378A1 (en) 2006-12-20 2006-12-20 A bushing and a method for producing the same
BRPI0622234-0A BRPI0622234A2 (en) 2006-12-20 2006-12-20 bushing and method to produce the same
JP2009541722A JP2010514395A (en) 2006-12-20 2006-12-20 Bushing and method for manufacturing the bushing
US12/487,336 US7812266B2 (en) 2006-12-20 2009-06-18 Bushing and a method for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2006/000726 WO2008074166A1 (en) 2006-12-20 2006-12-20 A bushing and a method for producing the same

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/487,336 Continuation US7812266B2 (en) 2006-12-20 2009-06-18 Bushing and a method for producing the same

Publications (1)

Publication Number Publication Date
WO2008074166A1 true WO2008074166A1 (en) 2008-06-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2006/000726 WO2008074166A1 (en) 2006-12-20 2006-12-20 A bushing and a method for producing the same

Country Status (6)

Country Link
US (1) US7812266B2 (en)
EP (1) EP2095378A1 (en)
JP (1) JP2010514395A (en)
CN (1) CN101669178B (en)
BR (1) BRPI0622234A2 (en)
WO (1) WO2008074166A1 (en)

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EP2276041A1 (en) 2009-07-15 2011-01-19 ABB Research Ltd. A device for electric connection and an electric installation
RU2491673C2 (en) * 2011-09-09 2013-08-27 Егор Олегович Кошелев High-voltage post-type insulator
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US7812266B2 (en) 2010-10-12
EP2095378A1 (en) 2009-09-02
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JP2010514395A (en) 2010-04-30
US20090288878A1 (en) 2009-11-26
CN101669178A (en) 2010-03-10
BRPI0622234A2 (en) 2012-01-03

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