Method for processing vacuum switch and vacuum switch processed by the method
US4736078A · kind A · utility
3Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1987 |
| Grant date | Apr 5, 1988 |
| Priority date | — |
| Expiry date | Apr 28, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2001/0205
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vacuum switch having two main electrodes encased in a vacuum vessel to be operable in opening and closing the main electrodes, is provided with a contact piece made of a copper-chromium alloy secured or formed on at least one of the main electrodes. The operational property of the main electrodes is substantially improved by flowing and interrupting an electric current of a predetermined current density for a number of times through the two main electrodes for improving surface condition of the contact piece by forming a recrystallized layer over the outer surface of the contact piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.