CH273214A - Process for the production of voltage-dependent resistors for surge arresters. - Google Patents
Process for the production of voltage-dependent resistors for surge arresters.Info
- Publication number
- CH273214A CH273214A CH273214DA CH273214A CH 273214 A CH273214 A CH 273214A CH 273214D A CH273214D A CH 273214DA CH 273214 A CH273214 A CH 273214A
- Authority
- CH
- Switzerland
- Prior art keywords
- resistors
- binding agent
- voltage
- impregnated
- production
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/105—Varistor cores
- H01C7/118—Carbide, e.g. SiC type
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mold Materials And Core Materials (AREA)
Description
Verfahren zur Herstellung von spannungsabhängigen Widerständen für Überspannungsableiter. Die bisherigen spannungsabhängigen Wi derstände für Überspannungsableiter be stehen aus Siliziumkarbid, das mit einem Bindemittel, wie z. B. Ton, Feldspat usw., zusammen gebrannt wird. Da sich nun die Sperrschicht auf dem Sihziumkarbid beim Brennen mit Temperaturen von über 800 verändert, so wird dadurch auch die Strom- Spannungs-Charakteristik des Widerstands körpers verändert.
Es ist daher der ganze Brennprozess, um eine gleichmässige Fabri kation zu erhalten, bezüglich Brenntempe ratur und Brenndauer sehr gut zu über wachen. Es hat sich weiter gezeigt, dass die Güte des Widerstandes, d. h die Spannungs abhängigkeit, stark vom Bindemittel ab hängig ist.
Mit einem Bindemittel, bei dem ein Bren nen nicht mehr notwendig ist, lässt sich eine gleichmässigere Fabrikation erzielen, und durch ein entsprechendes Bindemittel kann die Spannungsabhängigkeit und die Bela stungsfähigkeit des Widerstandskörpers we sentlich verbessert werden. Eingehende Un tersuchungen haben nun gezeigt, dass beson ders Wasserglas, Zinkoxyd und Ton ein sehr geeignetes Bindemittel sind, um solche Widerstände herzustellen.
Die vorliegende Erfindung beruht nun darauf, dass als Bindemittel Wasserglas und Zinkoxyd, welchen Stoffen allenfalls noch Ton beigesetzt sein kann, verwendet werden. Um diese Widerstandskörper gegenüber Ein wirkungen von Feuchtigkeit unempfindlich zu machen, können die spannungsabhängigen Widerstände nach dem Abbinden des Binde mittels mit einem in warmem Zustand flüssigen Isoliermaterial imprägniert werden. Diese Imprägnierung erfolgt mit Vorteil unter Vakuum. Das Imprägnierungsmittel besteht vorzugsweise aus Asphalt, Paraffin, Schwefel oder Öl.
Es können aber auch Giess harze gebraucht werden, die nachher ohne Gasabgabe definitiv in festen Zustand über gehen.
Process for the production of voltage-dependent resistors for surge arresters. The previous voltage-dependent Wi resistors for surge arresters are made of silicon carbide, which is coated with a binder, such as. B. clay, feldspar, etc., is burned together. Since the barrier layer on the silicon carbide changes during firing at temperatures of over 800, this also changes the current-voltage characteristics of the resistor body.
The entire firing process must therefore be monitored very carefully with regard to the firing temperature and duration in order to obtain a uniform production. It has also been shown that the quality of the resistance, i.e. h the voltage dependency, is strongly dependent on the binder.
A more even production can be achieved with a binding agent that no longer requires firing, and a suitable binding agent can significantly improve the voltage dependency and the load capacity of the resistor body. In-depth investigations have now shown that water glass, zinc oxide and clay in particular are very suitable binders for producing such resistors.
The present invention is based on the fact that water glass and zinc oxide, which substances can at most also contain clay, are used as binders. In order to make these resistance bodies insensitive to the effects of moisture, the voltage-dependent resistors can be impregnated with an insulating material that is liquid in a warm state after the binding has set. This impregnation is advantageously carried out under vacuum. The impregnating agent preferably consists of asphalt, paraffin, sulfur or oil.
However, casting resins can also be used, which afterwards definitely change into a solid state without releasing gas.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH273214T | 1949-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH273214A true CH273214A (en) | 1951-01-31 |
Family
ID=4479149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH273214D CH273214A (en) | 1949-02-24 | 1949-02-24 | Process for the production of voltage-dependent resistors for surge arresters. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH273214A (en) |
-
1949
- 1949-02-24 CH CH273214D patent/CH273214A/en unknown
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