EP0889487B1 - Durchführungsisolator mit elektrische Feldabschirmung, insbesondere für Mittel- und Hochspannungsschaltanlagen - Google Patents
Durchführungsisolator mit elektrische Feldabschirmung, insbesondere für Mittel- und Hochspannungsschaltanlagen Download PDFInfo
- Publication number
- EP0889487B1 EP0889487B1 EP98202137A EP98202137A EP0889487B1 EP 0889487 B1 EP0889487 B1 EP 0889487B1 EP 98202137 A EP98202137 A EP 98202137A EP 98202137 A EP98202137 A EP 98202137A EP 0889487 B1 EP0889487 B1 EP 0889487B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shape memory
- bushing insulator
- metal insert
- memory material
- shielding
- 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
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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
- H01B17/26—Lead-in insulators; Lead-through insulators
Definitions
- bushing insulators such as those for medium-voltage switchboards, for example, generally comprise a moulding of electrical insulating material that separates the grounded metal structure of the electrical equipment from the live conductor and which encloses a metal insert for shielding the electrical field. Said insert has the function of limiting the electrical stresses acting on the distribution of the field lines.
- the inserts are normally made using a metal mesh that must be able to withstand the mechanical stresses that occur during the phase for moulding the insulating material to avoid deformations that could impact its correct positioning.
- the task of the invention is precisely to overcome the drawbacks set forth above by making a bushing insulator with shielding of the electrical field to be used, for example, in medium and high-voltage air-insulated switchboards (AIS), gas-insulated switchboards (GIS), medium and high-voltage power transformers and reactance, instrument transformers, capacitors, and medium and high-voltage gas insulated busbar in which it is possible to use metal inserts that, while having a relatively low mass are able to maintain a predetermined shape and position at the moment of moulding, thus achieving the best characteristics from an electrical standpoint.
- AIS air-insulated switchboards
- GIS gas-insulated switchboards
- GIS gas-insulated switchboards
- VCS medium and high-voltage power transformers and reactance
- instrument transformers capacitors
- medium and high-voltage gas insulated busbar in which it is possible to use metal inserts that, while having a relatively low mass are able to maintain a predetermined shape and position at the moment of moulding, thus achieving the
- one particular object of the invention is to develop a bushing insulator in which any deformations are eliminated with certainty at the moment of moulding, so that the metal insert has the optimal position and shape when the resin is polymerised.
- a further object of the present invention is to develop a bushing having high reliability and safety in use due to its distinctive constructional characteristics.
- the last object of the present invention is to develop a bushing insulator that can easily be obtained from commercially available parts and materials and that is, moreover, competitive from a purely economic standpoint.
- a bushing insulator for shielding an electrical field comprising a moulding of electrical insulating material to be located in a passage hole in an electrical switchboard and enclosing a metal insert for shielding the electrical field.
- the bushing insulator according to the invention is characterised in that said metal insert comprises a shape memory material capable to assume a predetermined shape upon thermal stress.
- the bushing insulator with shielding of the electrical field according to the invention comprises a casting 2 of electrical insulating material, that it is preferably made of epoxy resin, which is located in a hole 3 provided in the metal wall of an electrical switchboard, generally indicated by reference number 4.
- a metal insert is provided around the conductor 5 to be shielded, said metal insert being embedded in the moulding of electrical insulating material.
- the distinctive feature of the invention is constituted by the fact that said metal insert, which has the function of limiting the electrical stress acting on the distribution of the field lines, is made using shape memory alloys that, when subjected to thermal stress, restore the correct geometry within the material.
- the shape memory alloys for example alloys such as NiTi, CuAl, CuAlX, where X is Ni, Be, Zn or Mn, and CuZnY, where Y is Al, Si, Sn, Ga or Mn, are characterised by the possibility of restoring their original configuration determined in the design phase when they are subjected to an increase in temperature above a critical transition temperature; these shape memory alloys thus ensure the correct position and shape is restored within the insulator at the moment of moulding the plastic in liquid phase at high temperature.
- the shape memory metal component in martensite phase is positioned in the moulding simply taking care to fix the insert correctly in the various fixing points, without having to pay any particular attention to the overall position of the insert.
- the insert At the moment of moulding the liquid resin, at high temperature, the insert begins responding to the thermal stress, actuating the transformation from martensite to austenite phase and thus regaining the original design shape and assuming the predetermined shape that corresponds to the optimal positioning of the metal insert.
- the response of the shape memory material to the thermal stress which is defined as the time required for the predetermined shape to be restored, is in the order of fractions of a second.
- the polymerisation time of the resin consequently does not cause any limitation on this restoration of shape.
- so-called “single shot” shape memory alloys defined as alloys that guarantee perfect functioning for a single operation or for a few operations. Indeed for this type of application it is not necessary for the alloy to be able to execute the restoration of shape more than once, given that the correct position is subsequently held due to the fact that the metal insert remains embedded in the resin moulding.
- a metal insert is illustrated, indicated by 10a, which is shaped with a toroidal portion and is made using a mesh of shape memory material that enables easier passage of the resin during moulding.
- Figure 4 illustrates a metal insert, indicated by 10b that is obtained using a foil that is also made of shape memory material.
- the shape memory material may simply form a part of the metal insert and not necessarily the entire metal insert, provided that the portions used are able to restore -the entire metal insert to its predetermined shape.
- the insert 10 comprises inserts 10c of shape memory material that are positioned parallel to the axis and extend over the entire circumferential development of the insert.
- inserts of shape memory alloy indicated by 10d that have an annular configuration and are uniformly distributed.
- the inserts 10e are positioned so that they cross over one another and are made of shape memory alloy applied to an insert 10 that can have different shapes.
- the shape memory alloy insert 10f assumes a helical position within a metal insert that can be made in a variety of ways.
- thermo-mechanical stress that is applied by the liquid resin has a positive effect, since it causes the automatic restoration of the designed shape and consequently of the optimal characteristics of the insert that is always positioned perfectly.
- traditional shielding undergoes a distortion in the designed shape and consequently has a negative effect.
Landscapes
- Insulators (AREA)
- Insulating Bodies (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Cable Accessories (AREA)
- Installation Of Bus-Bars (AREA)
Claims (8)
- Buchsenisolator (1) zum Abschirmen eines elektrischen Feldes, umfassend ein Formteil (2) aus elektrisch isolierendem Material, das in einem Durchgangsloch (3) in einer elektrischen Schalttafel (4) anzuordnen ist und eine Metalleinlage zum Abschirmen des elektrischen Feldes einschließt, dadurch gekennzeichnet, daß die Metalleinlage (10) ein Formgedächtnismaterial enthält, das in der Lage ist, bei thermischer Beanspruchung eine vorbestimmte Form einzunehmen.
- Buchsenisolator nach Anspruch 1, dadurch gekennzeichnet, daß die Metalleinlage ein Gewebe (10a) aus dem genannten Formgedächtnismaterial enthält:
- Buchsenisolator nach Anspruch 1, dadurch gekennzeichnet, daß die Metalleinlage eine Folie (10b) aus dem genannten Formgedächtnismaterial enthält.
- Buchsenisolator nach Anspruch 1, dadurch gekennzeichnet, daß die Metalleinlage Einlagen (10c) aus dem genannten Formgedächtnismaterial enthält.
- Buchsenisolator nach Anspruch 4, dadurch gekennzeichnet, daß die genannten Einlagen aus Formgedächtnismaterial in Richtungen verlaufen, die im wesentlichen parallel zur Achse der Metalleinlage sind.
- Buchsenisolator nach Anspruch 4, dadurch gekennzeichnet, daß die genannten Einlagen aus Formgedächtnismaterial um den zu isolierenden Leiter herum eine ringförmige Gestalt (10d) haben.
- Buchsenisolator nach Anspruch 4, dadurch gekennzeichnet, daß die genannten Einlagen aus Formgedächtnismaterial über Kreuz zueinander angeordnet sind.
- Buchsenisolator nach Anspruch 4, wie in einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die genannten Einlagen aus Formgedächtnismaterial eine schraubenförmige Abwicklung (10f) haben.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI971558 | 1997-07-01 | ||
IT97MI001558A IT1292447B1 (it) | 1997-07-01 | 1997-07-01 | Isolatore passante con schermatura del campo elettrico,particolarmente per quadri di media e alta tensione |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0889487A2 EP0889487A2 (de) | 1999-01-07 |
EP0889487A3 EP0889487A3 (de) | 1999-02-24 |
EP0889487B1 true EP0889487B1 (de) | 2004-03-03 |
Family
ID=11377475
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98202137A Expired - Lifetime EP0889487B1 (de) | 1997-07-01 | 1998-06-26 | Durchführungsisolator mit elektrische Feldabschirmung, insbesondere für Mittel- und Hochspannungsschaltanlagen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0889487B1 (de) |
AT (1) | ATE261179T1 (de) |
DE (1) | DE69822041T2 (de) |
ES (1) | ES2217499T3 (de) |
IT (1) | IT1292447B1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR200449360Y1 (ko) | 2008-10-09 | 2010-07-05 | 김태선 | 부싱용 쉴드 |
EP4001928A1 (de) * | 2020-11-19 | 2022-05-25 | 3M Innovative Properties Company | Sensorisolierstecker |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19547120A1 (de) * | 1995-12-16 | 1997-06-19 | Sachsenwerk Ag | Elektrode |
-
1997
- 1997-07-01 IT IT97MI001558A patent/IT1292447B1/it active IP Right Grant
-
1998
- 1998-06-26 AT AT98202137T patent/ATE261179T1/de not_active IP Right Cessation
- 1998-06-26 EP EP98202137A patent/EP0889487B1/de not_active Expired - Lifetime
- 1998-06-26 ES ES98202137T patent/ES2217499T3/es not_active Expired - Lifetime
- 1998-06-26 DE DE69822041T patent/DE69822041T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69822041D1 (de) | 2004-04-08 |
ES2217499T3 (es) | 2004-11-01 |
ITMI971558A0 (de) | 1997-07-01 |
DE69822041T2 (de) | 2005-03-03 |
EP0889487A2 (de) | 1999-01-07 |
ITMI971558A1 (it) | 1999-01-01 |
EP0889487A3 (de) | 1999-02-24 |
ATE261179T1 (de) | 2004-03-15 |
IT1292447B1 (it) | 1999-02-08 |
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