DE611854C - Arc-proof high-voltage insulator made of ceramic insulating material - Google Patents

Arc-proof high-voltage insulator made of ceramic insulating material

Info

Publication number
DE611854C
DE611854C DE1930611854D DE611854DD DE611854C DE 611854 C DE611854 C DE 611854C DE 1930611854 D DE1930611854 D DE 1930611854D DE 611854D D DE611854D D DE 611854DD DE 611854 C DE611854 C DE 611854C
Authority
DE
Germany
Prior art keywords
arc
insulating material
ceramic insulating
proof high
voltage insulator
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
DE1930611854D
Other languages
German (de)
Inventor
Hugo Berens
Dr J Gingold
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.)
Steatit Magnesia AG
Original Assignee
Steatit Magnesia AG
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
Application filed by Steatit Magnesia AG filed Critical Steatit Magnesia AG
Application granted granted Critical
Publication of DE611854C publication Critical patent/DE611854C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/24—Manufacture of porcelain or white ware
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Description

Lichtbogensicherer Hochspannungsisolator aus keramischem Isolierstoff Die bisher in der Hochspannungstechnik verwandten Isolatoren, z. B. Hängeisolatoren, haben den großen -Nachteil, daß sie beim Überschlagen eines Lichtbogens nach kurzer Zeit zerstört werden und das Herabfallen der Leitungen verursachen. Dies ist insbesondere dann der Fall, wenn die überstromausIösevorrichtungen nicht schnell genug das Netz abschalten. Die Zertrümmerung des Isolators bei der Berührung mit dem Lichtbogen erfolgt dadurch, daß die Wärmeausdehnung des Isolierstoffes an der getroffenen Stelle eine bis zum Bruch führende mechanische Spannung verursacht. Hält der Isolator jedoch eine Weile aus, so beginnen die getroffenen Stellen des Isolators zu erweichen und zu schmelzen, und die mechanische Spannung läßt wieder nach. Es ist einleuchtend, daß ein Isolator um so betriebssicherer ist, je weniger leicht er durch die Berührung mit dem Lichtbogen zerspringt. Der einzige Schaden, welcher zwischen dem Einsatz des Überschlages und dem Abschalten der Leitung bzw. dem natürlichen Wiederabreißen des Lichtbogens :entsteht, ist dann eine teilweise Anschmelzung des Isolierstoffes. Um einen derartigen sprungsicheren Isolator keramisch herzustellen, ist es notwendig, den thermischen Ausdehnungskoeffizienten herabzusetzen, und zwar bis unterhalb 2-10-6, wobei dieser Wert als Mittelwert zwischen Zimmertemperatur und 65o° bestimmt wird. Nach der Erfindung wird zum Herstellen des Isolators eine keramische Masse des Systems Mg0 (A1203):Si02 verwendet, wobei die Mengenverhältnisse der Oxyde im wesentlichen derart gewählt werden, daß auf 8 bis 13 0/'o M90 31 bis 43 % A1203 und 49 bis 5 5 0;o Si02 kommen; man erhält dann bei richtiger Brennweise einen von Plagioklasen freien Isoli=rstoff, dessen Ausdehnungskoeffizient bis unter das obengenannte notwendige Maß absinkt. Solche Massen lassen sich ohne weitere Floßmittel, also durch teilweise Bildung einer eutektischen Schmelze, dichtbrennen. Eine wesentliche Erleichterung dieses Brennverfahrens wird jedoch erfindungsgemäß dadurch erzielt, daß dem genannten System Mg0 (A1203) Si02 Eisenoxyd oder andere Schwermetalloxyde -als vierte Komponente hinzugesetzt werden. Hierbei braucht man nicht das verhältnismäßig teure Eisenoxyd zu verwei'lden; vielmehr verfährt man zweckmäßig so, daß ein Teil der Tonsubstanz, die auf alle Fälle zum Aufbau der Masse notwendig ist, in Form von rotbrennendem Ton zugesetzt wird.Arc-proof high-voltage insulator made of ceramic insulating material The insulators previously used in high voltage technology, e.g. B. suspension insulators, have the big disadvantage that they are short-lived when an arc flashes Time and cause the lines to fall. This is particular then the case when the overcurrent tripping devices do not power the network fast enough switch off. The shattering of the insulator when it comes into contact with the arc takes place in that the thermal expansion of the insulating material at the affected point causes a mechanical tension leading to breakage. However, the isolator holds for a while, the affected areas of the insulator begin to soften and to melt, and the mechanical tension subsides again. It is obvious that an insulator is the more reliable, the less light it is through contact bursts with the arc. The only damage between uses the rollover and the disconnection of the line or the natural tearing again of the electric arc: if this occurs, the insulating material is partially melted. In order to produce such a crack-proof insulator with ceramics, it is necessary to reduce the coefficient of thermal expansion to below 2-10-6, this value being determined as the mean value between room temperature and 65o °. According to the invention, a ceramic mass of the system is used to produce the insulator Mg0 (A1203): Si02 used, the proportions of the oxides being essentially can be chosen such that on 8 to 13 0 / 'o M90 31 to 43% A1203 and 49 to 5 5 0; o Si02 come; If the firing is done correctly, you will get one of plagioclases Free insulating material, whose coefficient of expansion is below the above-mentioned necessary Level drops. Such masses can be partially rafted without further raft means Formation of a eutectic melt, burn tightly. A major relief However, this combustion process is achieved according to the invention in that said System Mg0 (A1203) Si02 iron oxide or other heavy metal oxides - as the fourth component can be added. Here one does not need the relatively expensive iron oxide to dwell; rather, one proceeds expediently in such a way that part of the clay substance, which is necessary in any case to build up the mass, in the form of red-burning Clay is added.

Claims (2)

PATENTANSPRÜCHE: t. Lichtbogensicherer Hochspannungsisolator aus keramischem Isolierstoff, dadurch gekennzeichnet, daß der Baustoff in seinen wesentlichen Bestandteilen dem System Mg0 (A1,03) Si02 mit einer mengenmäßigen Zusammensetzung von etwa 8 bis 13 % Mg O, 3 r bis 43 % Al. 0;,, 49 bis 55 % Si02 angehört, frei von Pl.agioklasen ist und einen Ausdehnungskoeffizienten von weniger als 2.z0-6, gemessen als Mittelwert zwischen 2o und 65o° C, hat. PATENT CLAIMS: t. Arc-proof high-voltage insulator of ceramic insulating material, characterized in that the building material in its essential components, the system Mg0 (A1,03) Si02 having a quantitative composition of about 8-1 3% Mg O, r 3 to 43% Al. 0; ,, belongs to 49 to 55% Si02, is free of pl.agioclases and has an expansion coefficient of less than 2.z0-6, measured as an average value between 2o and 65o ° C. 2. Isolator nach Anspruch z, dadurch gekennzeichnet, daß als Flußmittel Schwermetalloxyde, insbesondere Eisenoxyd, zugegeben. sind.2. Isolator according to claim z, characterized in that heavy metal oxides, especially iron oxide, admitted. are.
DE1930611854D 1930-12-23 1930-12-23 Arc-proof high-voltage insulator made of ceramic insulating material Expired DE611854C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE611854T 1930-12-23

Publications (1)

Publication Number Publication Date
DE611854C true DE611854C (en) 1935-04-08

Family

ID=6576311

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930611854D Expired DE611854C (en) 1930-12-23 1930-12-23 Arc-proof high-voltage insulator made of ceramic insulating material

Country Status (1)

Country Link
DE (1) DE611854C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300953A (en) * 1980-07-03 1981-11-17 Corning Glass Works Dense cordierite containing manganese

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300953A (en) * 1980-07-03 1981-11-17 Corning Glass Works Dense cordierite containing manganese

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