Static overcurrent relay
US3942074A · kind A · utility
5Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Sep 27, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A solid state protective device is disclosed which protects electrical apparatus from heat damage due to overcurrents, particularly one which protects electrical generators from damage caused by heat due to excessive negative phase sequence currents. The device includes a novel reset feature such that the time required for the device to take protective action after an overcurrent is detected is reduced by a period of time which is a linear function of the heat remaining in the protected apparatus due to any prior overcurrents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.