EP4330993A1 - High-voltage bushing - Google Patents
High-voltage bushingInfo
- Publication number
- EP4330993A1 EP4330993A1 EP21735871.2A EP21735871A EP4330993A1 EP 4330993 A1 EP4330993 A1 EP 4330993A1 EP 21735871 A EP21735871 A EP 21735871A EP 4330993 A1 EP4330993 A1 EP 4330993A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage bushing
- insulating body
- projection
- voltage
- conductor
- 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.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 5
- 239000012212 insulator Substances 0.000 description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 244000258044 Solanum gilo Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
-
- 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
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
- H01B17/583—Grommets; Bushings
Definitions
- the invention relates to a high-voltage bushing comprising an insulator, an inner conductor which is passed through the insulator, and a fastening flange arranged on the outside of the insulating body.
- Such a high-voltage bushing usually has the task of electrically insulating the inner conductor, which is at high-voltage potential during operation of the high-voltage bushing, from an environment at ground potential, for example a wall of a high-voltage system or a tank wall of a transformer. Furthermore, high-voltage bushings are also used as cable terminations to connect a cable to an overhead line.
- the high-voltage bushing is usually firmly attached to the wall or to another component that is accordingly stationary by means of the fastening flange.
- the two axial ends of the inner conductor of the high-voltage bushing are connected to electrical lines (e.g. an overhead line, a transformer winding or a cable).
- electrical lines e.g. an overhead line, a transformer winding or a cable.
- a suitable mechanical connection with the connected cable and an electrically and field-technically coordinated transition between the two cables connected to one another by means of the high-voltage bushing are particularly important for the functionality and reliability of the high-voltage bushing.
- the object of the invention is to provide a species-appropriate high-voltage bushing that is as reliable as possible in operation.
- the object is achieved with a species-appropriate high-voltage bushing according to the invention in that the high-voltage bushing also includes a retaining ring with the Be- fastening flange, suitably detachably connected, for example by means of a screw connection, and the insulator has an outer peripheral outer projection which positively interacts with an inner projection of the retaining ring in order to counteract an axial force on the high-voltage bushing fastened during operation.
- high compressive and tensile forces can act on the high-voltage bushing.
- the outer projection of the insulator interacts with the inner projection of the ring and advantageously provides a holding force that counteracts an axial tensile or compressive force and prevents the insulator from shifting relative to the mounting flange or at least minimizes this risk. For most applications it is sufficient if a radial height of the outer projection is between 3 mm and 30 mm.
- the outer projection expediently interacts with the inner projection on a form-fitting surface or support surface, with the form-fitting surface being inclined by less than 90 degrees relative to a longitudinal axis of the high-voltage bushing. Accordingly, the outer protrusion is formed not in a typical step shape but in a chamfer shape.
- a sloping design of the support surface is particularly advantageous, since this leads to the introduction of force into the components leads, which does not at the same time create a fracture initiation point like eg a right angle could do.
- the retaining ring is designed in several parts, in particular in two parts. In some applications it can be advantageous if the retaining ring does not have to be slid onto the insulating body but can be assembled from two or more parts. In particular, if the geometry of the high-voltage bushing or the insulator does not allow the retaining ring to be pushed on, assembly can be achieved by assembling the two-part retaining ring.
- an O-ring is arranged between the outer projection and the inner projection, preferably made of an elastic material.
- the O-ring serves to compensate for any structural inaccuracies in the two projections.
- the O-ring can, for example, made of nitrile rubber or an elastic rubber material.
- the insulating body has a counter-projection on a cone-like tapered end.
- the counter-projection can advantageously allow the geometry of the insulating body, in particular a cone angle of the tapering end, to be adapted to a geometry of a connection component, or to optimize the electrical properties of the high-voltage bushing in this area.
- the high-voltage bushing can include a sleeve to adapt the inner conductor to a connecting line.
- the sleeve is pushed onto a machined seat of the winding carrier with a precise fit. It essentially has no conductive function.
- good dielectric properties can be guaranteed at the connection point between the high-voltage bushing and the respective connection component.
- the insulating body comprises resin-impregnated insulating layers.
- Such an insulating body is dimensionally stable after impregnation with the resin (e.g. egg nem epoxy resin) and forms a relatively hard block which is particularly well suited for shaping the outer projection.
- the insulating layers can comprise paper or fleece and be wound concentrically or spirally around the inner conductor to form a bobbin. In this way, the production of the high-voltage leadthrough can be carried out in a particularly simple and cost-effective manner. In addition, a particularly uniform arrangement of the insulation layers can be guaranteed in the insulator.
- the insulating body preferably includes a control area with conductive control inserts for field control. An axial expansion of the control area is determined by the axial expansion from the control inserts.
- the control inserts are used for the capacitive field control of the electrical field of the high-voltage bushing during its operation. This results in a further improvement in the electrical properties of the high-voltage bushing.
- the control inserts are arranged around the inner conductor essentially concentrically with one another. For example, they can be produced as aluminum foils.
- the outer projection is suitably outside the control area of the insulator.
- the insulating body includes an electrode which is electrically (galvanically) connected to the inner conductor and is arranged outside an axial extension of the control area.
- the electrode is suitably a separate metallic insert (e.g. made of aluminum nium).
- the insert is preferably arranged essentially concentrically to the inner conductor, for example at a radial distance of between 5 mm and 20 mm from an outer circumference of the inner conductor. It can have an axial length of between 10 mm and 50 mm.
- the connection to the inner conductor, whereby the electrode can also be connected to a first control insert is expediently made by means of a metallic strip (eg made of copper).
- a particularly suitable application of the high-voltage bushing is in a cable termination, the high-voltage bushing being connected to an electrical conductor, in particular a conductor of an overhead line, on a conductor side or a conductor end, and to a cable connection on a cable side or a cable end.
- the advantages result here in particular from the measures described above with regard to the field-technical design and a coordination of the course of the field lines starting from the ends of the inserts and the electrode in the active part or the insulating body of the high-voltage bushing through to the field-controlling elements in the cable end. Further advantages result from the measures described above, which allow minimizing the risk of the line being unintentionally pulled out of the high-voltage bushing due to the high tensile forces that occur.
- FIG. 1 shows an exemplary embodiment of a high-voltage bushing according to the invention in a schematic representation
- FIG. 2 shows a partial section of the high-voltage bushing from FIG. 1 in a schematic representation.
- a high-voltage bushing 1 is shown in FIG.
- the high-voltage bushing 1 comprises an insulating body 2 and an inner conductor 3 which is passed through the insulating body 2 .
- the high-voltage bushing 1 has an overhead conductor end la for connection to an overhead line and a cable end lb for connection to a cable connection or by means of the cable connection to a cable.
- a dot-dash line M characterizes a central or symmetrical axis of the high-voltage bushing 1.
- the insulating body 2 has insulating layers made of paper, fleece or another insulating material, which are wound onto the inner conductor 3 .
- the insulating layers can also be wound onto a winding carrier in which an inner conductor is arranged.
- Within the insulating body 2 are located at radial distances from each other conductive control inserts 4,
- control inserts 4 e.g. made of aluminum foil
- the spatial area in which the control inserts 4, 5 extend within the insulating body 2 is indicated in FIG.
- the insulator 2 is impregnated with an epoxy resin and bil det a compact block.
- the insulator 2 tapers conically toward the cable end lb.
- An insulating layer 11 comprising an elastic cal material (e.g. silicone, rubber, etc.) can be arranged at the cable end 1b for a better connection to the cable connection.
- the high-voltage bushing 1 also includes a fastening supply flange 7, in the example shown in the form of a flange disk, which is outside directly on the insulator 2 angeord net.
- a fastening supply flange 7 By means of the mounting flange 7, the high Voltage bushing 1 optionally mounted on a frame (which preferably includes insulator legs).
- the high-voltage bushing 1 of FIG. 1 is therefore positioned vertically, with the cable end 1b being at the bottom.
- the high-voltage bushing 1 has an outer housing 9 with insulating screens 10 .
- the high-voltage bushing 1 has a sleeve 12 at the cable end 1b for adapting an inner conductor diameter.
- the high-voltage bushing 1 has an electrode 13 connected to the inner conductor 3 (which is therefore at the electrical level of the inner conductor), which is arranged outside an axial extent of the control area, in particular axially.
- the high-voltage bushing 1 also includes a retaining ring 14 which is connected to the mounting flange 7 by means of a screw connection.
- the retaining ring 14 is formed in two parts and is in the manufacture of the high-voltage bushing 1 to the insulating body 2 together.
- the insulator 2 has an outer peripheral jump 15 which interacts with an inner projection 16 of the holder sat 14 in a form-fitting manner. In this way, an axially acting force can be counteracted.
- the fastening flange 7 can be fixed in place, with a tensile force acting on a cable connected to the high-voltage bushing 1 in the direction of an arrow 17 in order to counteract an axial force on the high-voltage bushing.
- the outer projection 15 acts with the inner projection 16 along a form-fitting surface 18 which surfaces of the outer projection 15 which face the inner projection 16 accordingly.
- the form-fitting surface 18 is inclined by less than 90 degrees relative to a longitudinal axis of the high-voltage leadthrough.
- the form-fitting surface 18 is not in direct contact with the inner projection 16 ; rather, an O-ring 19 is arranged between the inner projection 16 and the outer projection 15 .
- the insulator has a counter-projection 20. The choice of the height of the counter-projection 20 allows an optimal adjustment of the cone angle to a cable connection to be closed.
Landscapes
- Insulators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2021/066371 WO2022262976A1 (en) | 2021-06-17 | 2021-06-17 | High-voltage bushing |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4330993A1 true EP4330993A1 (en) | 2024-03-06 |
Family
ID=76695707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21735871.2A Pending EP4330993A1 (en) | 2021-06-17 | 2021-06-17 | High-voltage bushing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4330993A1 (en) |
CA (1) | CA3223796A1 (en) |
WO (1) | WO2022262976A1 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE50113402D1 (en) * | 2001-08-13 | 2008-01-31 | Abb Schweiz Ag | Method for producing a high voltage feedthrough |
BRPI0622234A2 (en) * | 2006-12-20 | 2012-01-03 | Abb Research Ltd | bushing and method to produce the same |
WO2010014530A1 (en) * | 2008-07-28 | 2010-02-04 | Agt Services, Inc. | High voltage bushing and flange with interior seal |
CN201638621U (en) * | 2009-12-29 | 2010-11-17 | 王海龙 | Ceramic bushing of high-voltage power capacitor |
CN102623110B (en) * | 2012-04-28 | 2013-12-18 | 卢秋华 | Insulator device |
US9741475B2 (en) * | 2014-09-25 | 2017-08-22 | Abb Schweiz Ag | Flange attachment |
EP3544028B1 (en) * | 2018-03-22 | 2022-01-05 | Hitachi Energy Switzerland AG | A bushing with a tap assembly |
EP3618084B1 (en) * | 2018-08-30 | 2021-09-29 | ABB Power Grids Switzerland AG | Electrical bushing having an anti-rotation mounting flange and method for mounting the same |
-
2021
- 2021-06-17 EP EP21735871.2A patent/EP4330993A1/en active Pending
- 2021-06-17 WO PCT/EP2021/066371 patent/WO2022262976A1/en active Application Filing
- 2021-06-17 CA CA3223796A patent/CA3223796A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CA3223796A1 (en) | 2022-12-22 |
WO2022262976A1 (en) | 2022-12-22 |
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Legal Events
Date | Code | Title | Description |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
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17P | Request for examination filed |
Effective date: 20231201 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HSP HOCHSPANNUNGSGERAETE GMBH |