Electrical changeover switching
US5604424A · kind A · utility
40Cited by
7References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 4, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | May 4, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F29/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A changeover switch for a tap changer including a pair of load switches. A diverter switch allows load to be diverted along a second path when its associated main switch is opened or closed. An auxiliary circuit has an auxiliary switch and a varistor connected in parallel across the secondary of a transformer. When the auxiliary switch is opened the varistor impedance is reflected onto the primary of the transformer which causes the current in the main switch to divert through the diverter switch so that the main switch can be opened or closed with substantially no load on it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.