Method of improving varistor upturn characteristics
US4219518A · kind A · utility
4Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | May 15, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C17/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for producing varistors exhibiting improved upturn characteristics comprises controllably heating a pressed varistor powder mix to a temperature, and for a time, sufficient to form a ceramic material, and then quenching the ceramic material at a rate in excess of approximately 500.degree. C. per hour. The method is particularly advantageous when dopants such as aluminum, antimony, indium, and gallium are employed. Additionally, a surge arrester is disclosed comprising a varistor connected in series with a spark gap, the varistor being produced in accordance with the aforementioned quenching method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.