Electrical insulator offering reduced sensitivity to pollution
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United States of America Patent
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Jan 7, 1986
Grant Date -
N/A
app pub date -
Apr 23, 1984
filing date -
Apr 29, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electrical insulator offering reduced sensitivity to pollution comprises a body of a glass or porcelain dielectric material with a semiconductor outside coating. This coating mainly consists of zinc oxide with at least one further metal oxide added to it to make its voltage-current characteristic non-linear, such that I=kV.sup..alpha. where I is current, V is voltage, k and .alpha. are coefficients, and the value of .alpha. is between 20 and 50. The coating is between 0.05 and 0.5 mm thick. The further metal oxide is advantageously selected from bismuth, manganese, cobalt, chromium and antimony oxides.
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