Overvoltage arrester with rare gas filled housing - has electrodes supporting insulator coated with semiconductor material

摘要

In the gas-filled housing are mounted opposite electrodes, inserted into the ends of a tubular insulator (3). The latter inner and/or outer surface is coated with semiconductor material (4), at least up to the regions near the junctions of the two electrodes (1, 2) with the insulator. Preferably the electrodes are frustoconical, and the spacing of the semiconductor coating from the electrodes exceeds the distance of the electrodes active surface. Preferably the semiconductor coating is based on zinc oxide, titanium oxide, copper oxide, iron oxide, individually or in a mixt. with a possible admixture of bismuth oxide and/or cobalt oxide. The coating on the insulator inside may be of different composition from the on the outside.