Electrical insulator offering reduced sensitivity to pollution
US4563544A · kind A · utility
6Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Apr 23, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B19/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.