Integrated circuit linear time delay extender for static relays
US3970899A · kind A · utility
4Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Feb 3, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/093
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A static relay utilizing a resistance-capacitance network to provide a current-time characteristic which has an inverse relationship for appropriately controlling protective operations in power transmission and distribution networks. An integrated dual-threshold and clamp circuit is employed in the static relay to adjustably control the time delay characteristic of the network over a range of several orders of magnitude without altering the time delay wave shape or requiring matched components and incorporates linear time setting means to facilitate adjustment and usage of the static relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.