EP0832492B1 - Elektrischer isolator und verfahren zur dessen herstellung - Google Patents

Elektrischer isolator und verfahren zur dessen herstellung Download PDF

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Publication number
EP0832492B1
EP0832492B1 EP96917800A EP96917800A EP0832492B1 EP 0832492 B1 EP0832492 B1 EP 0832492B1 EP 96917800 A EP96917800 A EP 96917800A EP 96917800 A EP96917800 A EP 96917800A EP 0832492 B1 EP0832492 B1 EP 0832492B1
Authority
EP
European Patent Office
Prior art keywords
insulator
insulant
pole
gas
flange
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
EP96917800A
Other languages
English (en)
French (fr)
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EP0832492A1 (de
Inventor
Odd Bendiksen
Peter Wuthrich
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ABB AB
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ABB AB
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Publication date
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Publication of EP0832492A1 publication Critical patent/EP0832492A1/de
Application granted granted Critical
Publication of EP0832492B1 publication Critical patent/EP0832492B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01B17/14—Supporting insulators
    • H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator

Definitions

  • the present invention relates to an electric insulator of the kind described in the preamble to claim 1 and a method for manufacturing the same as described in the preamble of claim 7.
  • the insulator comprises an elongated, hollow insulant provided at each end with an attachment or connection flange.
  • the insulator may comprise a contact device with cooperating fixed and movable main and arcing contacts.
  • the insulator may also be in the form of a support insulator for a circuit breaker and then comprises a continuous operating rod for the circuit breaker.
  • an insulator according to the invention is filled with an electrically insulating gas, preferably SF 6 , but may also be filled with other types of insulating and arc-extinguishing media.
  • an electrically insulating gas preferably SF 6
  • the designations insulation, insulant, and the like relate to insulation against electrical flashover.
  • An insulator usually comprises two attachment means retained by an insulant. Its primary task is to electrically separate two poles with different voltage potential.
  • insulants of porcelain or of polymeric material are preferably used.
  • the poles of the insulator are equipped with attachment flanges.
  • As dimensioning criterion for an insulator there is primarily used that distance between the poles which provides sufficient safety against flashover, but also other aspects, such as resistance to mechanical forces, may occur.
  • the thickness of the material in relation to the length and the diameter is of importance.
  • gas-filled insulators also the tightness of the material and in pole connections must be taken into consideration.
  • the attachment flanges must be able to be connected tightly to the insulants and also withstand a certain overpressure of the enclosed insulating gas.
  • a gas-filled insulator of the above-mentioned kind with one attachment flange at each end is previously known from US-A-4 827 373.
  • a support insulator here supports an extinguishing chamber insulator comprising an interrupting element, whereby a hermetically sealed space, filled with SF 6 gas, extends through the units.
  • the insulant of both the support insulator and the extinguishing chamber insulator is in the form of a hollow, circular-cylindrical porcelain body, the outer surface of which is enamelled.
  • the porcelain body exhibits a number of water-repellent grooves along the main part of its length.
  • the porcelain body has a smooth cylindrical portion, each of which being surrounded by an annular pole of electrically conducting material provided with an attachment flange.
  • the support insulator and the extinguishing chamber insulator are attached to each other by a screw joint, a connection flange for connection to the network being placed between the insulators.
  • the connection flange is first attached to the pole ring of one of the insulators, in which case good tightness against the leakage of gas must be ensured.
  • the insulator, with the connection flange mounted thereon is attached to the pole ring of the second insulator. Also with this attachment, the tightness against leakage of gas must be ensured.
  • a problem with the known insulator is that, during mounting, two cut surfaces must be sealed and that the time of mounting may be considerable.
  • the distance between the poles must be made large. This distance is counted between two adjacent electrically conducting parts of the poles. In this case, these consist of the pole rings externally fixed around the ends of the porcelain body.
  • the total overall height of the insulator is thus the safety distance plus the height of each pole ring. In this way, the insulator will have a height which is larger than that which is defined by the safety distance.
  • An additional gas-filled insulator according to the preamble of claim 1 is known from SU 1557590.
  • This insulator comprises an insulant wound or cast onto two end poles.
  • the poles are designed with radially projecting elevations which engage into radial slots formed in the insulant during the casting.
  • the elevations are brought to be pressed against the sides of the slots such that a self-sealing joint is formed by way of a coating.
  • a disadvantage with the known insulator is that, during casting of the insulant, a mould must be arranged on the inside of the insulator. This mould must either be left or be able to be removed in some other way afterwards.
  • an insulator In case of outdoor mounting, an insulator must be provided with grooves to increase the leakage path and reduce the risk of flashover.
  • a further disadvantage of the known insulator is that such an outer insulant, provided with grooves, must be manufactured in an additional process, which increases the cost and increases risk of the occurrence of air pockets which may jeopardize the safety.
  • the object of the invention is to achieve an insulator of the above-mentioned kind, which has a lower overall height for a given rated voltage and which entails a saving of material and time during mounting.
  • the lower overall height permits the thickness of the material and the length of the insulant to be made smaller, thus reducing the production cost.
  • a flanged annular pole is inserted and attached with its annular part on the inside of a hollow insulant.
  • the safety distance in relation to flashovers is smaller with an insulating gas between two poles than with air between the poles.
  • the flanged connection plate may be completely omitted. This results in only one cut surface which has to be sealed as well as in one joint with fewer parts.
  • the attachment flanges are formed with plane attachment surfaces, in which an O-ring placed in a slot is arranged for sealing.
  • the plane flanges may be provided with projecting portions or be arranged with an oval plane section to make possible connection into the network.
  • Another object of the invention is a method for manufacturing such a gas filled electric insulator as claimed in claim 7.
  • Figure 1 shows the upper part of a lower support insulator comprising a tubular inner insulant 1 of, for example, glass fibre-reinforced epoxy resin, onto which is cast an outer insulant provided with grooves and being, for example, of silicone rubber.
  • a tubular inner insulant 1 of, for example, glass fibre-reinforced epoxy resin, onto which is cast an outer insulant provided with grooves and being, for example, of silicone rubber.
  • an upper pole 3 of electrically conducting material is inserted into the upper part of the tubular inner insulant 1.
  • the pole 3 comprises an annular part 9, the outer diameter of which is smaller than the inner diameter of the inner insulant 1.
  • the annular part 9 is fixed to the insulant 1 with an adhesive 6, such as glue or the like.
  • the pole further comprises a flange 4, the outer portion 5 of which is rounded to avoid concentrations of the electric field.
  • the mounting surface 7 of the flange is plane and has a slot 8, in which an O-ring (for sealing against an end surface) may be placed.
  • the annular part 9 of the pole, facing inwardly towards the insulator, has rounded edges to avoid electric field concentrations.
  • An extinguishing chamber insulator comprising a circuit breaker and the lower part of which is shown in Figure 1, is mounted against the support insulator.
  • the extinguishing chamber insulator comprises an inner insulant 1' of, for example, glass fibre-reinforced epoxy resin, onto which there is cast an outer insulant 2' of, for example, silicone rubber provided with grooves.
  • an upper pole 3' of electrically conducting material is inserted into the tubular inner insulant 1'.
  • the pole 3' comprises an annular part 9', the outer diameter of which is smaller than the inner diameter of the inner insulant 1' and which is fixed to the insulant 1' with an adhesive 6' such as glue or the like.
  • the pole comprises a flange 4', the diameter of which is larger than that of the corresponding flange 4 of the support insulator and the outer portion 5' of which is rounded to avoid concentrations of the electric field.
  • the mounting surface 7' of the flange 4' is plane and provided with a circular slot 8' with a square cross section, in which is placed an O ring 10 for sealing between the flanges 4, 4' which are mounted against each other.
  • the extinguishing chamber insulator is fixed to the support insulator by fixing their attachment flanges 4, 4' to each other with a screw joint 11.
  • the screws are threaded in the upper flange 4' and, upon tightening, press the two attachment surfaces 7, 7' against each other.
  • the O ring 10 located in the slot 8' is thereby subjected to an elastic deformation which causes it to seal against the two flanges.
  • An upper current collector 12 is connected to the upper pole 3' with a screw joint 13 to be further connected to the network by means of a conductor (not shown) connected to the flange 4'.
  • the insulators which are assembled together in the manner described above have a common internal space which is filled with an insulating gas, for example SF 6 .
  • the safety distance with respect to flashover is therefore smaller on the inside of the insulator than on the outside thereof.
  • the poles inserted into each end of the insulants make use of this effect.
  • the distance between the inserted parts 9, 9' of the poles and the parts inserted into the other end of the respective insulant is shorter than the corresponding distance between the flanges 5, 5' exposed on the outside of the insulant. Since a shorter safety distance may be allowed on the inside of the insulator, the dimensioning safety distance is thereby defined between those outer edge portions of the flanges which are exposed on the outside at the two ends of the insulator.
  • the effect thus utilized permits the insulant to be made shorter. A saving in length of up to 10 % may thus be achieved, which entails a corresponding saving in costs.
  • connection flange which is dispensed with by the invention constitutes a further saving of material and a reduction of the mounting time, which entails a saving in costs of about 5 %. In total terms, thus, a saving of about 20 % may be obtained when utilizing the invention.
  • the invention is not only intended to be utilized for support insulators or extinguishing chamber insulators, but may arbitrarily be used with all types of hollow insulators, both for high voltage and at a lower voltage.
  • the poles inserted into the insulant may also be attached by means of a shrinkage fit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)

Claims (7)

  1. Ein gasgefüllter, elektrischer Isolator für Hochspannung, umfassend ein rohrförmiges Isolationsmittel (1) mit einem an jedem Ende des Isolators gasdicht befestigten Pol (3), der einen Flansch (4) und einen ringförmigen Teil (9) umfasst, der so in den Isolator eingefügt ist, dass nur der Flansch (4) des Pols auf der Aussenseite des Isolators freiliegt, dadurch gekennzeichnet, dass der ringförmige Teil (9) einen Aussendurchmesser aufweist, der kleiner ist als der Innendurchmesser des Isolationsmittels (1) und, dass der ringförmige Teil (9) in das Isolationsmittel (1) einfügbar ist.
  2. Ein Isolator gemäß Anspruch 1, dadurch gekennzeichnet, dass das Isolationsmittel (1) einen Porzellankörper umfasst.
  3. Ein Isolator gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Isolationsmittel ein glasfaserverstärktes Epoxitrohr (1) mit einer äusseren Verkleidung (2) aus Silikongummi, die mit Rillen versehen ist, umfasst.
  4. Ein Isolator gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Flansche (4) der Pole flach sind in einer Ebene, die senkrecht zu der Längsachse des Isolators ist und, dass sie Mittel zum Befestigen (11) und zum Dichten (8) umfassen.
  5. Ein Isolator gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass er mit SF6 Gas gefüllt ist.
  6. Ein Isolator gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Flansche (4) der Pole dazu angepasst sind, elektrisch an ein Hochspannungsnetzwerk angeschlossen zu sein.
  7. Ein Verfahren zum Herstellen eines gasgefüllten, elektrischen Isolators für Hochspannung, umfassend ein rohrförmiges Isolationsmittel (1) mit einem Pol (3), der gasdicht an jedem Ende des Isolationsmittels befestigt ist und der einen Flansch (4) und einen ringförmigen Teil (9) umfasst, so dass nur der Flansch (4) des Pols auf der Aussenseite des Isolationsmittels freiliegt, dadurch gekennzeichnet, dass der ringförmige Teil (9) mit einem Aussendurchmesser, der kleiner ist als der Innendurchmesser des Isolationsmittels, ausgelegt ist, um in das Isolationsmittel eingefügt zu werden, und somit einen größeren Sicherheitsabstand in Bezug auf Überschläge nutzt, der innerhalb des gasgefüllten Isolators gestattet ist, um die Gesamthöhe des Isolators zu verringern.
EP96917800A 1995-06-13 1996-06-12 Elektrischer isolator und verfahren zur dessen herstellung Expired - Lifetime EP0832492B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9502136 1995-06-13
SE9502136A SE506198C2 (sv) 1995-06-13 1995-06-13 Elektrisk isolator och förfarande för dess framställning
PCT/SE1996/000772 WO1996042092A1 (en) 1995-06-13 1996-06-12 Electric insulator

Publications (2)

Publication Number Publication Date
EP0832492A1 EP0832492A1 (de) 1998-04-01
EP0832492B1 true EP0832492B1 (de) 2001-03-28

Family

ID=20398592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96917800A Expired - Lifetime EP0832492B1 (de) 1995-06-13 1996-06-12 Elektrischer isolator und verfahren zur dessen herstellung

Country Status (5)

Country Link
EP (1) EP0832492B1 (de)
JP (1) JPH11507756A (de)
DE (1) DE69612285D1 (de)
SE (1) SE506198C2 (de)
WO (1) WO1996042092A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1293788B1 (it) * 1997-07-25 1999-03-10 Abb Research Ltd Isolatore polimerico per il supporto di linee elettriche e di componentistica elettrica in genere
IT1298992B1 (it) * 1998-03-31 2000-02-07 Abb Adda S P A Isolatore alettato

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596646A5 (de) * 1975-07-03 1978-03-15 Haefely & Cie Ag Emil
CH612790A5 (en) * 1977-04-29 1979-08-15 Sprecher & Schuh Ag Ceramic sleeve insulator with compressed-gas filling, especially for electrical installations and apparatuses
DE8704829U1 (de) * 1987-04-01 1988-07-28 Siemens AG, 1000 Berlin und 8000 München Elektrischer Hochspannungs-Leistungsschalter, insbesondere Druckgas-Leistungsschalter
SE464897B (sv) * 1989-07-10 1991-06-24 Asea Brown Boveri Stoedisolator

Also Published As

Publication number Publication date
SE9502136L (sv) 1996-12-14
SE9502136D0 (sv) 1995-06-13
SE506198C2 (sv) 1997-11-17
JPH11507756A (ja) 1999-07-06
DE69612285D1 (de) 2001-05-03
EP0832492A1 (de) 1998-04-01
WO1996042092A1 (en) 1996-12-27

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