Static overcurrent trip device to operate a circuit breaker in response of fault conditions in an alternating current net system
US4571659A · kind A · utility
12Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1983 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Jul 13, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/093
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The analog electronic trip device comprises a time-lag tripping circuit formed by a non-linear function generator likely to elaborate by approximation the tripping characteristic of the circuit breaker. The device includes an integrating amplifier comprising a negative-feedback capacitor C and two inputs in phase opposition. One of the inputs is submitted to two threshold voltages V.sub.R1, V.sub.R2 determining the mode of long-time delay or short-time delay operation of the trip device. The second threshold voltage V.sub.R2 is set by a resistive switch which determines the short delay tripping threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.