EP0126984B1 - Isolateur électrique présentant une insensibilité à la pollution - Google Patents

Isolateur électrique présentant une insensibilité à la pollution Download PDF

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Publication number
EP0126984B1
EP0126984B1 EP84104677A EP84104677A EP0126984B1 EP 0126984 B1 EP0126984 B1 EP 0126984B1 EP 84104677 A EP84104677 A EP 84104677A EP 84104677 A EP84104677 A EP 84104677A EP 0126984 B1 EP0126984 B1 EP 0126984B1
Authority
EP
European Patent Office
Prior art keywords
coating
zinc oxide
insulator
pollution
layer
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
Application number
EP84104677A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0126984A1 (fr
Inventor
Ai Bui
Laurent Pargamin
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.)
Ceraver SA
Original Assignee
Ceraver SA
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=9288375&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0126984(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ceraver SA filed Critical Ceraver SA
Priority to AT84104677T priority Critical patent/ATE28533T1/de
Publication of EP0126984A1 publication Critical patent/EP0126984A1/fr
Application granted granted Critical
Publication of EP0126984B1 publication Critical patent/EP0126984B1/fr
Expired 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
    • H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04—Treating the surfaces, e.g. applying coatings

Definitions

  • the invention relates to electrical insulators having improved insensitivity to pollution and more particularly those whose dielectrics are made of glass or porcelain.
  • the semiconductor layer plays practically no role, because it is the polluted layer which fixes the distribution of potential, irregularly.
  • the present invention as defined by claim 1 overcomes these drawbacks.
  • composition of the coating according to the invention is known per se and in use for certain electronic components called varistors - see for example document EP-A-0 000 864.
  • varistors see for example document EP-A-0 000 864.
  • a pollution problem surface and current distribution between a polluted layer and the underlying varistor does not arise for such components.
  • a variation in the current density of the order of 10 6 corresponds to a variation in the voltage gradient close to 2.
  • the coefficients k and ⁇ are characteristic of the material and geometric dimensions (in particular the insulator's creepage distance, coating thickness).
  • the zinc oxide content in the coating is advantageously greater than 90%.
  • Said metal oxide is advantageously chosen from the group formed by bismuth oxide, manganese oxide, cobalt oxide, chromium oxide, antimony oxide.
  • the particular characteristic of the coating based on zinc oxide used in the context of the present invention is that it prevents the local formation of arcs in the dry areas.
  • the distribution of the electric field on the surface of the insulator is improved and this prevents the bypass arc.
  • the voltage can be stabilized below the threshold. bypass in the air.
  • FIG. 1 there is shown a section 1 of an insulator constituted by an assembly of insulating elements such as 2.
  • Each element 2 substantially comprises a dielectric 3 made of glass or porcelain for example, provided with a metal cover 4 and a metal connecting rod 5.
  • the dielectric 3 is coated externally with a thin layer 6 based on zinc oxide doped with at least one other metal oxide.
  • the layer 6 can have a thickness of between 0.05 and 0.5 mm.
  • this mixture is sintered at 1250 ° C. and then, for 10 grams of product, 0.5 mole of Bi 2 0 3 (0.2691 g of Bi 2 0 3 ) is added.
  • composition and thickness of the coating layer are adjusted according to the electrical characteristics desired for said layer.
  • the shape of the insulator also comes into play.
  • the establishment of the coating based on zinc oxide can be carried out according to various procedures.
  • an insulator comprising a porcelain dielectric
  • the powder is shaped, for example, by spraying or by vacuum deposition, in the form of a layer on the external surface of the dielectric.
  • the thickness of the layer is chosen to be sufficient to be compatible with the overheating it will have to undergo during the operation of the insulator and according to the desired electrical characteristics.
  • the deposition of the zinc oxide-based layer can be carried out in particular by vacuum deposition and spray deposition techniques.
  • the measurements were made at 25 ° C.
  • the curve (A) relates to a material corresponding to the composition of the first example mentioned above and the curve (B) to a semiconductor enamel used according to the prior art for coating a insulator.
  • the intensity of the current which crosses the zinc oxide is very important, higher than 1000 amperes and being able to reach 30000 amperes, whereas in the insulator according to the invention, the intensity is between the milliamp and the amp.
  • the action of the zinc oxide-based layer is local and manifests itself in several places at fairly short time intervals without causing the service to be interrupted.
  • the action is instantaneous; it concerns the entire arrester, which is passed through entirely, and causes the service to stop by opening the line protection circuit breakers.

Landscapes

  • Inorganic Insulating Materials (AREA)
  • Organic Insulating Materials (AREA)
  • Thermistors And Varistors (AREA)
  • Insulators (AREA)
  • Insulated Conductors (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Spark Plugs (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
EP84104677A 1983-04-29 1984-04-26 Isolateur électrique présentant une insensibilité à la pollution Expired EP0126984B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104677T ATE28533T1 (de) 1983-04-29 1984-04-26 Verschmutzungsunempfindlicher elektrischer isolator.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8307100 1983-04-29
FR8307100A FR2545259B1 (fr) 1983-04-29 1983-04-29 Isolateur electrique presentant une insensibilite amelioree a la pollution

Publications (2)

Publication Number Publication Date
EP0126984A1 EP0126984A1 (fr) 1984-12-05
EP0126984B1 true EP0126984B1 (fr) 1987-07-22

Family

ID=9288375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104677A Expired EP0126984B1 (fr) 1983-04-29 1984-04-26 Isolateur électrique présentant une insensibilité à la pollution

Country Status (14)

Country Link
US (1) US4563544A (enrdf_load_stackoverflow)
EP (1) EP0126984B1 (enrdf_load_stackoverflow)
JP (1) JPS59207515A (enrdf_load_stackoverflow)
AT (1) ATE28533T1 (enrdf_load_stackoverflow)
AU (1) AU564892B2 (enrdf_load_stackoverflow)
BR (1) BR8401989A (enrdf_load_stackoverflow)
CA (1) CA1250916A (enrdf_load_stackoverflow)
DE (1) DE3464983D1 (enrdf_load_stackoverflow)
ES (1) ES287936Y (enrdf_load_stackoverflow)
FR (1) FR2545259B1 (enrdf_load_stackoverflow)
MX (1) MX158055A (enrdf_load_stackoverflow)
NO (1) NO164389C (enrdf_load_stackoverflow)
NZ (1) NZ207972A (enrdf_load_stackoverflow)
ZA (1) ZA843160B (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4803100A (en) * 1987-10-21 1989-02-07 International Business Machines Corporation Suspension and use thereof
US4835341A (en) * 1988-03-08 1989-05-30 Maxwell Laboratories, Inc. Electrical insulator for use in plasma environment
US5548089A (en) * 1994-01-13 1996-08-20 Cooper Industries, Inc. Bushing for gas-insulated switchgear
GB0103255D0 (en) * 2001-02-09 2001-03-28 Tyco Electronics Raychem Gmbh Insulator arrangement
KR100910417B1 (ko) 2008-02-14 2009-08-04 삼광유리공업주식회사 내열 강화 유리 애자 및 그 제조방법
ES2787511T3 (es) * 2010-05-28 2020-10-16 Lapp Insulator Gmbh Aislante compuesto
FR3067164B1 (fr) 2017-06-02 2019-08-02 Sediver Sa Procede de traitement d'un composant en verre ou porcelaine a revetement protecteur super-hydrophobe
US12354766B2 (en) * 2024-05-15 2025-07-08 Chaohu University Large-tonnage disc-shaped suspension ceramic insulator and prestressing assembling device and method for same

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB586064A (en) * 1945-02-20 1947-03-05 Taylor Tunnicliff And Company An improved electrically-conductive ceramic coating or composition
US2576723A (en) * 1946-10-11 1951-11-27 Bullers Ltd Electric insulator having potential drop controlling means
DE1003309B (de) * 1954-05-17 1957-02-28 Licentia Gmbh Hochspannungsisolator, insbesondere der Verschmutzung ausgesetzter Freiluftisolator
GB1112765A (en) * 1965-06-01 1968-05-08 Taylor Tunnicliff & Co Ltd Improvements in or relating to semi-conducting ceramic glaze compositions
GB1240854A (en) * 1968-09-27 1971-07-28 British Railways Board Improvements relating to high voltage electrical insulators
US3795499A (en) * 1969-10-11 1974-03-05 Ngk Insulators Ltd Method of producing semi-conducting glaze compositions
US3627905A (en) * 1969-12-08 1971-12-14 British Railways Board High-voltage electrical insulator having a predetermined surface conductance
DE2361204C3 (de) * 1973-12-06 1978-11-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektrische Hochspannungseinrichtung mit Isolierkörpern
US4031498A (en) * 1974-10-26 1977-06-21 Kabushiki Kaisha Meidensha Non-linear voltage-dependent resistor
CH601135A5 (enrdf_load_stackoverflow) * 1976-07-01 1978-06-30 Bbc Brown Boveri & Cie
DE2735484C2 (de) * 1977-08-05 1984-06-07 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Herstellung von Dickfilm-Varistoren mit Zinkoxid als Hauptkomponente

Also Published As

Publication number Publication date
EP0126984A1 (fr) 1984-12-05
AU564892B2 (en) 1987-08-27
NO164389B (no) 1990-06-18
BR8401989A (pt) 1984-12-04
NZ207972A (en) 1986-07-11
JPH0247808B2 (enrdf_load_stackoverflow) 1990-10-23
US4563544A (en) 1986-01-07
DE3464983D1 (en) 1987-08-27
FR2545259B1 (fr) 1985-12-27
NO841647L (no) 1984-10-30
FR2545259A1 (fr) 1984-11-02
ES287936U (es) 1985-11-16
AU2744184A (en) 1984-11-01
JPS59207515A (ja) 1984-11-24
MX158055A (es) 1988-12-29
CA1250916A (fr) 1989-03-07
NO164389C (no) 1990-09-26
ZA843160B (en) 1985-07-31
ATE28533T1 (de) 1987-08-15
ES287936Y (es) 1986-06-16

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