EP0948000B1 - Shed insulator - Google Patents

Shed insulator Download PDF

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Publication number
EP0948000B1
EP0948000B1 EP19990200980 EP99200980A EP0948000B1 EP 0948000 B1 EP0948000 B1 EP 0948000B1 EP 19990200980 EP19990200980 EP 19990200980 EP 99200980 A EP99200980 A EP 99200980A EP 0948000 B1 EP0948000 B1 EP 0948000B1
Authority
EP
European Patent Office
Prior art keywords
insulator
shed
collar
parts
insulator according
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.)
Revoked
Application number
EP19990200980
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0948000A2 (en
EP0948000A3 (en
Inventor
Costante Piazza
Massimo Zecchini
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 Trasmissione e Distribuzione SpA
Original Assignee
ABB Trasmissione e Distribuzione 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11379608&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0948000(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ABB Trasmissione e Distribuzione SpA filed Critical ABB Trasmissione e Distribuzione SpA
Publication of EP0948000A2 publication Critical patent/EP0948000A2/en
Publication of EP0948000A3 publication Critical patent/EP0948000A3/en
Application granted granted Critical
Publication of EP0948000B1 publication Critical patent/EP0948000B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies

Definitions

  • the present invention relates to a shed insulator, particularly for a pole of a medium ad/or high-voltage circuit breaker, having particular shape and characteristics.
  • shed insulators are generally constituted by a shed tube which is entirely made of ceramic material; as an alternative, it is possible to have insulators provided with a tubular part, made of composite material, around which sheds made of silicone material are arranged.
  • the pole of the circuit breaker in fact comprises a porcelain insulator which is constituted by two mutually separate parts: a first part, commonly termed supporting insulator, which is arranged in the lower part of the pole relative to the vertical axis of the circuit breaker and constitutes a supporting structure inside which the means for actuating the fixed and moving contacts of the circuit breaker are located; and a second part, generically termed interruption chamber insulator, is located in the upper part of the pole and contains the interruption chamber for the contacts of the circuit breaker.
  • connection between these two structurally separate parts is provided by adopting intermediate junction components according to an embodiment which entails considerable drawbacks and disadvantages.
  • a metal collar is fixed both to the upper end surface of the supporting insulator and to the lower end surface of the interruption chamber insulator in order to provide size matching between these two parts; the two collars are fixed to the respective insulators by cementing.
  • An additional geometric matching element is then interposed between the two collars and is generally constituted by a metal plate, with whose surface a tang is associated which acts as a current tap for external electrical connection to the insulator; the current reaches the tang by means of a current collector which is located inside the interruption chamber insulator and is screwed to said plate.
  • the metal plate is then screwed to both collars by means of a complicated system of bolts; in this manner, the supporting insulator is assembled to the interruption chamber insulator.
  • the insulator is formed monolithically.
  • this solution allows to eliminate some of the drawbacks of the production of porcelain insulators, it also entails drawbacks especially as regards the production step.
  • the production of monolithic insulators owing to the dimensions involved, entails the use of very long spindles, producing a single insulator at a time and consequently increasing the production times.
  • the production of a monolithic insulator does not allow to optimize the amount of composite material used, since for example it prevents the adoption of a smaller diameter in the supporting insulator part that contains the means for actuating the contacts of the circuit breaker, which would allow to save on the amount of composite material to be used.
  • the international patent application WO-A-9642092 describes an electric insulator of the type defined in the preamble of claim 1.
  • the aim of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, which has a simplified structure with a reduced number of components required to produce it in practice.
  • an object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, which provides a reduced overall height of the insulator for an equal creepage distance, consequently simplifying transport to the installation site.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, which provides an increase in the creepage distance for an equal total height of the pole, with a consequent improvement in the dielectric strength of said insulator.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, having a reduced number of junctions between its components.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, in which the amount of material used is reduced and therefore the overall weight of the pole of the circuit breaker is also reduced together with its production costs.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, which allows simple and optimized production.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, in which assembly can be performed easily and quickly.
  • Another object of the present invention is to provide a shed insulator, particularly for poles of medium- and/or high-voltage circuit breakers, which is highly reliable, relatively easy to manufacture and at competitive costs.
  • a shed insulator for poles of medium and/or high-voltage circuit breakers comprising, with respect to a vertical axis of the insulator itself, two parts, an upper part and a lower part respectively, each of said two parts comprising a tube made of composite material around which sheds made of silicone material are arranged, the upper part having a larger diameter than the lower part, characterized in that it comprises a single metal collar which is interposed between and mutually connects said upper and lower parts.
  • the description refers to a shed insulator used to provide a pole of a medium- and/or high-voltage circuit breaker, but this application must not be considered limitative in any way.
  • the shed insulator according to the invention comprises two parts, respectively a lower part 1 and an upper part 2 with reference to a vertical axis 3 of the insulator.
  • Both the lower part 1 and the upper part 2 are constituted by a tube, designated by the reference numerals 4 and 5 respectively, which is made of composite material, for example fiberglass, and around which sheds made of silicone material, designated by the reference numerals 6 and 7 respectively, are arranged; in particular, the tube 4 of the lower part 1 has a smaller diameter than the tube 5 of the upper part 2.
  • interruption chamber insulator contains the fixed contacts and the moving contacts, which are not shown in the figures. Said moving contacts, are actuated by known actuation means, also not shown, and couple to, and uncouple from, the corresponding fixed contacts, causing a closed/open state of the circuit breaker.
  • the lower part 1, hereinafter termed supporting insulator, contains means for actuating the moving contacts; the operation and the structure of said actuation means is extensively known from the art and is therefore not described further.
  • the two parts 1 and 2 are mutually connected by interposing a single metal collar 10.
  • the metal collar 10 has a tubular portion 11 on whose internal surface 11' and external surface 11" the lower part 1 and the upper part 2 are respectively glued at an end portion thereof.
  • the collar 10 has, externally to said tubular portion 11, a circular groove 12 with parallel cylindrical walls 11 and 17 in which at least the tip portion of the lower end of the upper part 2 of the insulator is embedded.
  • a raised portion 13 is provided against which the upper end of the lower part 1 of the insulator abuts.
  • holes 14 which allow coupling to a current collector 15 which is arranged inside the interruption chamber insulator.
  • the holes 14 are arranged along a circumference whose diameter is smaller than the diameter of the tube 4 of the lower part 1; in this manner a collar is obtained which is already per se compact and needs a reduced amount of material.
  • the current flows through the collector 15 into a tang 16 which is associated with the collar 10 and constitutes a current tap of the pole of the circuit breaker; in this manner, the collar acts not only as an element for joining the two parts of the insulator but also as a current tap of the circuit breaker.
  • the insulator according to the invention fully achieves the intended aim and objects, since in practice a monolithic insulator is obtained whose joining and assembly are extremely simplified. Moreover, by virtue of the particular embodiment of the joining collar, the insulator parts that are fixed to the collar are partly embedded inside said collar. In this manner, the outer insulator surface that is not covered by sheds is reduced significantly with respect to conventional insulators, with enormous advantages especially in the case of the poles of medium- and high-voltage circuit breakers.
  • the overall height of the pole is reduced, with advantages related to the bulk of said pole and to its transport to the installation site; as an alternative, if required by particular requirements and/or specific applications, the overall height of the pole can be left unchanged but in this case the creepage distance of the insulator is increased.
  • the mutual gluing of the two parts of the insulator and the collar in the case of the pole of a circuit breaker further ensures the tightness of the junction with respect to an insulating gas without having to use a sealing gasket; said insulation gas is used in the circuit breaker to quench any electric arc produced by the opening of the contacts.
  • the materials and the dimensions may be any according to requirements and to the state of the art.

Landscapes

  • Insulators (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP19990200980 1998-03-31 1999-03-31 Shed insulator Revoked EP0948000B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI980692 1998-03-31
IT98MI000692 IT1298992B1 (it) 1998-03-31 1998-03-31 Isolatore alettato

Publications (3)

Publication Number Publication Date
EP0948000A2 EP0948000A2 (en) 1999-10-06
EP0948000A3 EP0948000A3 (en) 2000-11-15
EP0948000B1 true EP0948000B1 (en) 2003-05-07

Family

ID=11379608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990200980 Revoked EP0948000B1 (en) 1998-03-31 1999-03-31 Shed insulator

Country Status (3)

Country Link
EP (1) EP0948000B1 (it)
DE (1) DE69907560T2 (it)
IT (1) IT1298992B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005271A (zh) * 2010-12-20 2011-04-06 东莞市高能电气股份有限公司 带内伞裙结构的分节式特高压支柱复合绝缘子

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE506198C2 (sv) * 1995-06-13 1997-11-17 Asea Brown Boveri Elektrisk isolator och förfarande för dess framställning

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005271A (zh) * 2010-12-20 2011-04-06 东莞市高能电气股份有限公司 带内伞裙结构的分节式特高压支柱复合绝缘子
CN102005271B (zh) * 2010-12-20 2012-07-25 东莞市高能电气股份有限公司 带内伞裙结构的分节式特高压支柱复合绝缘子

Also Published As

Publication number Publication date
DE69907560T2 (de) 2004-03-18
EP0948000A2 (en) 1999-10-06
ITMI980692A1 (it) 1999-10-01
EP0948000A3 (en) 2000-11-15
IT1298992B1 (it) 2000-02-07
DE69907560D1 (de) 2003-06-12

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