Load tap changer system
US4061963A · kind A · utility
29Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1976 |
| Grant date | Dec 6, 1977 |
| Priority date | — |
| Expiry date | Apr 27, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F29/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A load tap changer system for electrical power transformers, including protective apparatus which prevents a tap change in the event of a malfunction during a tap change cycle. The protective apparatus includes a relay and a current responsive device for operating the relay when current is flowing at a location prior to a tap change which would not have current flow during a normal tap change cycle. Current applied to the relay is maintained within the operating range of the relay by a tapped transformer operated by the tap changer drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.