Process for the production of a lightning arrester and products produced thereby
AssigneeBBC Brown, Boveri & Company, Limited
InventorsGunther Maier, Joseph Mosele, Roger Perkins
Life of this patent
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Abstract
A lightning arrester with a monolithic, active resistor core made of voltage-dependent resistance material based on ZnO is produced by mixing and grinding the base materials ZnO+metal oxides, producing pourable granules, filling into a silicone rubber tube and pressing cold-isostatically or radially into a moulding, sintering of the moulding into a self-supporting, monolithic resistor core, converting the resistor core, with an insulator by casting around, coating or painting with an epoxy resin, silicone material or concrete polymer or by drawing over a shrink-fit tube or by glazing. The resultant lightning arrester has a simple configuration, good reproducibility, cost-effective mass production.
Claims5
In a lightning arrester including an active resistor core made of a voltage-dependent resistance material based on ZnO, an insulator jacket, and terminal fittings serving as electrodes for electrical connections, the improvement comprising the active resistor core being a single, compact, monolithic workpiece having a substantially cylindrical shape with a height to diameter ratio greater than one and having a total of only two contact areas at its opposite ends, said ends each including at least one annular groove for improving adhesion with respect to adjacent electrodes.
A lightning arrester comprising an active resistor core formed of a voltage-dependent resistance material based upon ZnO formed as a monolithic structure having opposite ends, said opposite ends being formed with annular grooves therein to accept electrode members;
- first and second terminal electrodes fitted, respectively, to said opposite ends of the monolithic resistor core;
- and an insulating sheath formed about the core.
Dependencies are inferred from the claim text.